Dissertations / Theses on the topic 'Mineral analyses'
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Johansson, Fredrik. "Shear Strength of Unfilled and Rough Rock Joints in Sliding Stability Analyses of Concrete Dams." Doctoral thesis, Stockholm : Skolan för Arkitektur och samhällsbyggnad, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10450.
Full textWalker, Ryan Thomas. "Low-temperature Raman spectroscopic analyses of fluid inclusions from granitoid-related mineral deposits and comparisons with decrepitate analyses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0013/MQ52490.pdf.
Full textBooth, Colin Anthony. "Sediment-source-linkages in the Gwendraeth Estuary, south Wales, based on mineral magnetic analyses." Thesis, University of Wolverhampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394037.
Full textKlichowicz, Michael. "Modeling of realistic microstructures on the basis of quantitative mineralogical analyses." OpenD, 2020. https://tubaf.qucosa.de/id/qucosa%3A72835.
Full textThis research aims to make it possible to use realistic mineral microstructures in simulations of mineral processing. In particular, comminution processes, such as the crushing and grinding of raw mineral materials, are highly aff ected by the mineral microstructure, since the texture and structure of the many grains and their micromechanical properties determine the macroscopic fracture behavior. To illustrate this, consider a mineral material that essentially consists of grains of two diff erent mineral phases, such as quartz and feldspar. If the micromechanical properties of these two phases are diff erent, this will likely have an impact on the macroscopic fracture behavior. Assuming that the grains of one of the minerals break at lower loads, it is likely that a crack through a stone of that material will spread through the weaker grains. In fact, this is an important property for ore processing. In order to extract valuable minerals from an ore, it is important to liberate them from the commercially worthless material in which they are found. For this, it is essential to know and understand how the material breaks at grain-size level. To be able to simulate this breakage, it is important to use realistic models of the mineral microstructures. This study demonstrates how such realistic two-dimensional microstructures can be generated on the computer based on quantitative microstructural analysis. Furthermore, the study shows how these synthetic microstructures can then be incorporated into the well-established discrete element method, where the breakage of mineral material can be simulated at grain-size level.:List of Acronyms VII List of Latin Symbols IX List of Greek Symbols XV 1 Introduction 1 1.1 Motivation for using realistic microstructures in Discrete Element Method (DEM) 1 1.2 Possibilities for using realistic mineral microstructures in DEM simulations . 4 1.3 Objective and disposition of the thesis . . . . . . . . . . . . . . . . . . . . 7 2 Background 9 2.1 Discrete Element Method (DEM) . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.1 Fundamentals of the Discrete Element Method (DEM) . . . . . . . . 9 2.1.2 Applications of DEM in comminution science . . . . . . . . . . . . . 21 2.1.3 Limitations of DEM in comminution science . . . . . . . . . . . . . . 26 2.2 Quantitative Microstructural Analysis . . . . . . . . . . . . . . . . . . . . . 29 2.2.1 Fundamentals of the Quantitative Microstructural Analysis . . . . . . 29 2.2.2 Applied QMA in mineral processing . . . . . . . . . . . . . . . . . . 49 2.2.3 Applicability of the QMA for the synthesis of realistic microstructures 49 3 Synthesis of realistic mineral microstructures for DEM simulations 51 3.1 Development of a computer-assisted QMA for the analysis of real and synthetic mineral microstructures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 3.1.1 Fundamentals of the computer-assisted QMA . . . . . . . . . . . . 53 3.1.2 The requirements for the false-color image. . . . . . . . . . . . . . 54 3.1.3 The conversion of a given real mineral microstructure into a false-color image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.1.4 Implementation of the point, line, and area analysis . . . . . . . . . 59 3.1.5 Selection of appropriate QMA parameters for analyzing two-dimensional microstructures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.1.6 Summary of the principles of the adapted Quantitative Microstructural Analysis (QMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.2 Analysis of possible strategies for the microstructure synthesis . . . . . . . . 71 3.3 Implementation of the drawing method . . . . . . . . . . . . . . . . . . . . 76 3.3.1 Drawing of a single grain . . . . . . . . . . . . . . . . . . . . . . . 77 XVIII List of Greek Symbols 3.3.2 Drawing of multiple grains, which form a synthetic microstructure . . 81 3.3.3 Synthesizing mineral microstructures consisting of multiple phases . 85 3.4 The final program for microstructure analysis and synthesis . . . . . . . . . 89 3.4.1 Synthesis and analysis of an example microstructure . . . . . . . . . 90 3.4.2 Procedure for generating a realistic synthetic microstructure of a given real microstructure . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 4 Validation of the synthesis approach 103 4.1 Methodical considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 4.1.1 The basic idea of the validation procedure . . . . . . . . . . . . . . 103 4.1.2 The experimental realizations . . . . . . . . . . . . . . . . . . . . . 108 4.2 Basic indenter test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 4.2.1 Considerations for the basic indenter test . . . . . . . . . . . . . . . 109 4.2.2 Realization and evaluation of the real basic indenter test . . . . . . . 114 4.2.3 Realization and evaluation of the simulated basic indenter test . . . 127 4.2.4 Conclusions on the basic indenter test . . . . . . . . . . . . . . . . . 138 4.3 Extended indenter test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 4.3.1 Basic considerations for the extended indenter test . . . . . . . . . . 139 4.3.2 Realization and evaluation of the real extended indenter test . . . . 142 4.3.3 Realization and evaluation of the simulated extended indenter test . 154 4.3.4 Conclusions on the extended indenter test . . . . . . . . . . . . . . 171 4.4 Particle bed test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 4.4.1 Basic considerations for the particle bed test . . . . . . . . . . . . . 173 4.4.2 Realization and evaluation of the real particle bed test . . . . . . . . 176 4.4.3 Realization and evaluation of the simulated particle bed test . . . . . 188 4.4.4 Conclusions on the particle bed test . . . . . . . . . . . . . . . . . . 203 5 Conclusions and directions for future development 205 6 References 211 List of Figures 229 List of Tables 235 Appendix 237
Mamuse, Antony. "Spatial statistical estimation of undiscovered mineral endowment: case of komatiite-associated nickel sulphide resources, Kalgoorlie Terrane, Western Australia." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/449.
Full text[Verfasser], Chen Xiaochao, and Uwe [Akademischer Betreuer] Ludewig. "Comprehensive analyses of DNA methylation profile, regulation on flowering, and seed mineral accumulation in Arabidopsis thaliana in response to zinc deficiency / Chen Xiaochao ; Betreuer: Uwe Ludewig." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2017. http://d-nb.info/1126556750/34.
Full textCappello, Mariko'. "Petrographic and geochemical characterization of a sample taken from the beni bousera peridotite (Morocco)." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10833/.
Full textMohammed, Gihan. "Modélisation biogéochimique du système ”Irrigation-sol-plante-nappe” : Application à la durabilité du système de culture du foin de Crau." Thesis, Avignon, 2017. http://www.theses.fr/2017AVIG0691.
Full textA new methodology based on geochemistry and biology interfacing to study the sustainability of an irrigated agriculture system in the face of global changes (climate and urban sprawl). It requires construction of a spatio-temporal view of the ”irrigation - meadow (plant) - soil - groundwater” system evolution. Thereby two approaches are used : the field study and the modeling. The field study includes temporal and spatial survey of waters quality, plant quality and used fertilizers. The modeling consists of a biogeochemical model taking into account all the factors reaction of the system. The main theme is the mechanisms of acquiring the chemical composition of water during its transfer the soil horizon from irrigation water to groundwater. These mechanisms are studied from the double point of view of their geochemical balances and soil / solution reactions. The data acquisition thus relates to : (1) the chemical composition of irrigation water and groundwater ; (2) the soil mineralogy ; (3) the nature of the provided fertilizer ; (4) quantity of chemical elements uptaken by plants. The biogeochemical model consists in interfacing the crop model (STICS) and the geochemical model (PHREEQC). This model is able to perform the chemical evolution of waters during their pathway in the soil and to highlight the major processes that determine the water quality ; in output, it makes it possible to establish geochemical indicators relevant to the system management. The Crau is chosen as a demo area, South France, its grassland production is based on surface irrigation via channels withdrawn from the Durance River. Irrigation water is rich in minerals and trace elements thanks to alluvium brought, on which produce high quality hay that is regulated under appellation control since 1997. Additionally, this irrigation recharge the aquifer by 70% But it is threatened by global changes, which ultimately risks to compromising the sustainability of the irrigated grassland system. Data analysis over a long term (1960-2013), the acquisition of recent data and modeling show the originality and durability of this irrigated agrosystem and Its resilience to an increase in temperature by about 2°C, both in terms of yields and hay quality. However, according to future scenarios, declining of irrigation water is forecasted, and changes in land use by 10% of the total area, with a reduction in irrigated grassland areas. This may jeopardize the sustainability of the the irrigated agrosystem and thus the water supply for local use (300 000 inhabitants, the heavy industries of the Fos-sur-Mer site)
Hynes, B. R. "Mineral taxation : a comparative analysis." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292260.
Full textBosworth, Timothy Mark. "Sensors analysis of mineral insulating oil." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392986.
Full textSenna, Juliano Alves de. "Caracterização espectro-mineralogica e aspectos sobre a genese de materias-primas ceramicas classicas do Brasil : estudos de caso em depositos de pirofillita, talco e caulinita." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287210.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Resumo: Matérias primas cerâmicas (MP.C) naturais são materiais geológicos que exercem papel fundamental na economia de países mais desenvolvidos. Entretanto, no Brasil há uma tendência histórica em preterir investimentos na prospecção e explotação destes bens não metálicos em relação aos metálicos. Em função disso, os métodos de lavra até hoje utilizados são empíricos e o controle de qualidade precário, salvo alguns . poucos depósitos administrados por grandes grupos mineradores. Neste sentido, há uma clara lacuna tecnológica a ser preenchida neste setor no Brasil. A Espectroscopia de Reflectância (ER), baseada na faixa do visível e infravermelho de ondas curtas (0.4-2.5um), é uma ferramenta fundamental do sensoriamento remoto e eficaz na detecção de óxidos e hidróxidos de ferro e alumínio, carbonatos e filossilicatos. Seu uso potencial para caracterização espectro-mineral de MPCs é significativo, visto que não requer nenhuma preparação, é uma técnica rápida e de simples operacionalidade, e as análises podem ser feitas diretamente in situo Considerando as complexidades envolvidas nesta caracterização, os objetivos desta pesquisa foram: (i) avaliar a eficácia da ER em separar as faciologias dos minérios, (ii) propor modelos espectro mineralógicos dos depósitos, (iii) analisar as possibilidades de mapeamento dos minerais associados às jazidas, e (iv) determinar parâmetros que auxiliem na classificação dos minérios para uso industrial. Neste contexto, três importantes depósitos (peculiares e representativos metalotectos brasileiros) de MPCs foram escolhidos para investigação: (i) Pirofillita (Agalmatolito, para cerâmica refratária) em Mateus Leme (MG), (ii) Talco (para revestimentos cerâmicos) em Ponta Grossa (PR) e Caulinita (ball-clay, para louça sanitária e porcelana) em São Simão (SP). Em todos os depósitos, os materiais foram cuidadosamente classificados, seja quanto à composição mineral ou a aplicação industrial, com detecção dos principais minerais presentes e de espécimes ainda desconhecidas nos depósitos. Da mesma forma, o mapeamento interativo auxiliado por dados multiespectrais ASTER e espectros selecionados após a classificação, permitiu o reconhecimento espacial das abundâncias, concentrações e misturas minerais existentes nos depósitos. O sucesso da ER em caracterizar MPCs demonstrou a viabilidade.da técnica: (i) para o reconhecimento de fácies litológicas e fases minerais, (ii) para a investigação dos materiais in situ por equipamentos portáteis, (iii) para dar suporte ao planejamento de lavra de curto e longo prazo, e (iv) para aplicações multidisciplinares nos estágios pré e sinindustrialização. Desta forma, a pesquisa contemplou o objetivo de caracterizar os mais clássicos tipos de MPCs brasileiras, possibilitando o desenvolvimento de novas técnicas de explotação adequada a cada caso, considerando um controle de qualidade ideal. Adicionalmente, a análise integrada dos dados permitiu avanços no entendimento da geometria e gênese desses depósitos, os quais poderão ser utilizados em etapas futuras de prospecção dessas commodities.
Abstract: Raw ceramic materials (CM) are geological resources that play a fundamental role in the economy ofhigh1y developed countries. However, in Brazil there is a historical tendency in disregarding investments in the prospecting and exploitation of these non-metallic commodities, in contrast to the metallic equivalents. As a function of that, current mining approaches are yet too empirical and the quality control precarious, exception made to a few deposits administered by large mining companies. fu this sense, there has been a c1ear technological gap to be filled in this sector in Brazil. Reflectance Spectroscopy (RE), based on visible, near-inftared and shortwave inftared wayelengths, is a key remote sensing tool and effective in detecting Fe- and Al-bearing oxides and hydroxides, carbonates 8l1d phyllosilicates. Its potential use to the spectral-mineralogical characterization of CMs is significant, as it is a quick,operational, nondestructive technique that requires no sample preparation and that can be use for measuring materials in situo Considering the complexities involved in this characteyization, the objectives of this research were: (i) to evaluate the efficacy of ER in separating ores fades and associated rocks; (ii) to propose spectral-mineralogical models for the deposits, (iii) to analyze the possibility to map minerals associated to the deposits, and (iv) to determine parameters that might help in the c1assification of ores employed by the industry. In this context, three important deposits (peculiar and representative Brazilian metalotects) of ceramic materials were chosen for the investigation: (i) Pyrophyllite (agalmatolite, for reftactory pottery) in Mateus Leme (Minas Gerais), (ii) Ta1c (for ceramic coverings)in Ponta Grossa (PR) and, (iii) Kaolinite (ball-c1ay, for sanitaryware and china pottery) in São Simão (SP). In all of these deposits, the materials were carefu11y c1assified as regards both mineral composition and industrial applications, with detection of both foremost minerals and specimens yet unknown in the deposits. Similarly, the interactive mapping provided by the c1assification of ASTER multispectral data based on selected spectral endmembers permitted the spatial recognition of the abundances, concentrations and existing mineral mixtures in the deposits. The success of the ER in characterizing CMs showed the feasibility of the technique (i) for the recognition of lithologic facies and mineral phases, (ii) for the analysis of geologic materials in situ by portable instruments, (iii) to provide support to the planning of short- to longterm mining and, (iv) for multidisciplinary applications during pre- to contemporary-industrialization stages. Consequently, the main objective of the overall research to characterize a multitude of c1assic Brazilian CMs was achieved, allowing the development of new methods for quality controlled exploitation of distinct ceramic ores. Additionally, the integrated analysis of the data permitted advancements in the understanding of the geometry and genesis of those deposits, which could be utilized in future phases of prospecting of those commodities.
Doutorado
Metalogenese
Doutor em Ciências
Enholm, Zacharias. "Mineral Chemistry and Parageneses of Oxyborates in Metamorphosed Fe-Mn Oxide Deposits." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-292660.
Full textMineral är kemiska föreningar eller rena grundämnen som har en väldefinierad kemisk sammansättning, ordnad kristallstruktur och är bildade av geologiska processer. Oxyborater är en typ av sådana föreningar vilka innehåller grundämnena bor och syre samt olika kombinationer av metalliska grundämnen. Oxyboratmineral kan bland annat bildas i och omkring malmfyndigheter där grundämnet kisel är ovanligt eller icke förekommande, och kan utgöra de viktigaste borföreningarna i vissa sådana miljöer. Genom att bättre förstå denna typ av mineral och de kemiska och bildningsmässiga samband som finns mellan dem och andra föreningar kan vi få en större kunskap om hur de bildas, samt hur olika grundämnen kan omfördelas i sådana geologiska system. I denna studie har ett representativt urval av oxyborater undersökts med hjälp av mikroskopi och mikrokemiska samt spektroskopiska metoder för att testa huruvida deras kemiska sammansättning är direkt kopplad till den lokala miljön. De studerade proven kommer från karbonatbundna mineraliseringar i den västra delen av malmprovinsen Bergslagen i södra Mellansverige. De mineral som undersökts närmre är oxyboraterna blatterit, fredrikssonit, ludwigit, ortopinakiolit och pinakiolit. Resultaten visar på direkta kemiska samband mellan uppträdandet av fredrikssonit, ludwigit, ortopinakiolit samt pinakiolit, och de lokalt bergartsbildande mineral som de samexisterar med. Den breda kemiska fördelningen hos de metall- och syreföreningar som finns i samma omgivning som fredrikssonit och ludwigit förklarar också varför dessa två oxyborater generellt är mera vanligt förekommande än ortopinakiolit och pinakiolit. De spektroskopiska analyserna verifierar den tidigare klassificeringen av de studerade oxyboraterna samt visar på ett möjligt samband mellan innehållet av metallen mangan, samt hur grundämnet bor förekommer i deras kristallstruktur. Resultaten från denna studie bidrar med en kombination av nya kemiska, paragenetiska och spektroskopiska data samt ökar förståelsen av dessa värdmineral för grundämnet bor i malmfyndigheter med låg eller ingen kiselhalt. Resultaten ger även en insikt i hur den kemiska sammansättningen potentiellt kan påverka kristallstrukturen hos dessa oxyborater.
Koermer, Scott Carl. "The Application of Mineral Processing Techniques to the Scrap Recycling Industry." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/63994.
Full textMaster of Science
Chaves, Milena Lima. "ECONOMIC ANALYSIS OF THE MARKET FOR MINERAL WATER." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2642.
Full textThe dissertation is proposing to submit a descriptive analysis on the market of mineral waters. The approach of the subject is done, initially, through a brief history of his downing and panoramas of the world and national market. Through the data of total volume sold per thousand liters, the total amount sold in millions of real (Brazilian money), market share in volume and market share in value, the market for disposable mineral water of up to 19,999 ml of the designated area for analysis, it was possible to measure variables of economic significance as price, quality, market power and profits of companies in this segment. The methodology is applied in the calibration of parameters of a structural model of demand and supply. On the demand side, take the traditional model of Logit of discrete choice for differentiated products. In turn on the supply side it is assumed that firms compete to the Bertrand model.
A dissertaÃÃo se propÃe a apresentar uma anÃlise descritiva sobre o mercado de Ãguas minerais. A abordagem do tema à feita, inicialmente, atravÃs de um breve histÃrico do seu surgimento e panoramas mundial e nacional deste mercado. AtravÃs dos dados de valor total em volume vendido por mil litros, valor total vendido em milhÃes de reais, market share em volume e market share em valor, do mercado de Ãgua mineral descartÃvel de atà 19.999 ml da Ãrea delimitada para anÃlise, foi possÃvel mensurar variÃveis de significado econÃmico como preÃo, qualidade, poder de mercado e lucro das empresas deste segmento. A metodologia aplicada consiste na calibragem dos parÃmetros de um modelo estrutural de demanda e oferta. Pelo lado da demanda, assumimos o tradicional modelo de Logit de escolha discreta por produtos diferenciados. Por sua vez pelo lado da oferta parte-se do pressuposto que firmas competem à la Bertrand.
Karlkvist, Tommy. "Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches." Doctoral thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63132.
Full textNoble, Christopher Aaron. "Analytical and Numerical Techniques for the Optimal Design of Mineral Separation Circuits." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23224.
Full textPh. D.
Ma, Yamin. "Vegetation as a biotic driver for the formation of soil geochemical anomalies for mineral exploration of covered terranes." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0235.
Full textJones, J. M. "Magnetic minerals and heavy metals in ombrotrophic peat." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372671.
Full textSilva, Anna Flavia de Souza. "Caracterização e determinação de minerais em amostras de açúcares brasileiros." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-15082017-144746/.
Full textBrazil is the major producer of sugarcane and sugar, which is one of its main products. The term sugar refers to sucrose, a carbohydrate classified as a disaccharide, which is the most consumed in the world. Brazilian sugar production derives exclusively from sugarcane and about a third of what is produced remains for domestic retail. As opposed to what happens to the exportation type sugar, there is scarce information about this sugar type concerning to marketing issues in general, as well as the quality standard, which the sugar is available to the consumers. For evaluating the mineral profile of table sugar consumed by the Brazilian population (identification of the mineral elements: sulphur, potassium, phosphorous, calcium, copper, manganese, magnesium, silicon, iron and zinc), it was applied multi-element analytical instrumental method: Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES). The samples of sugar were still characterized as the basic quality attributes defined by Copersucar: pH, moisture and insoluble residues. Most of the sugar consumed in Brazil, in the domestic market, comes from the state of Sao Paulo, although it is possible to observe the trend of expansion to new agricultural frontiers. The industries (sugar mills), especially the new ones and located in the Expansion area, are investing in certification for the expansion in market share and higher revenues. The characterization of the sugar quality attributes showed that the pH is within the standards, the humidity presents specific problems in some samples (because of problems during storage) and the insoluble residues content is much higher than recommended. The new pattern in the raw material may explain this observation, as well as explains the much higher concentration of calcium, potassium, sulfur, silicon and iron observed when compared with nutritional food composition tables. In the quantitative determination carried out by ICP OES, it was possible to observe the viability of applying methods of direct analysis of solids, LIBS (Laser Induced Breakdown Spectroscopy) and EDXRF (Energy Dispersive X-ray Fluorescence), in qualitative and as promising quantitative analytical tools for routine analysis in sugar mills.
D'Mello, Nigel. "Spectroscopic and thermal analysis of clay mineral-organic composites." Thesis, Sheffield Hallam University, 2003. http://shura.shu.ac.uk/19566/.
Full textEriksson, Fredrik. "Assessment of static performance of LKAB´s welded mesh : Laboratory testing and analysis." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77249.
Full textYt-förstärkning är ett element som installeras mellan andra bergförstärkningar. Yt-förstärkning är konstruerade och installerade för att hålla tillbaka och minska bergutfall mellan dessa andra förstärknings installationer. En litteraturstudie har visat att det finns en mängd olika sätt att testa yt-förstärkningar. Olika testuppställningar förekommer, där olika specifikationer utav yt-förstärkningar är varierade. Inspännings metod, last på bultar samt olika sätt att inducera last har en stor spridning. Detta gäller för både statiska- och dynamiska lastförhållanden. En vanlig typ utav yt-support är svetsat stålnät med en wire tjocklek på 8gagues. Dessa är ihop svetsade till ett rutnät med 4 in × 4 in mellan wirarna. Dessa är installerade i olika gruvor med antingen ett diamant- eller kvadratiskt bultmönster, förekommande avstånd mellan är 1,2 m till 1,5 m mellan bultarna. Nät som används utav LKAB har en wire-diameter på 5,5 mm och ett avstånd på 75 mm × 75 mm i deras svetsade stålrutnät. Näten hos LKAB är installerade med ett kvadratiskt rutmönster med bultaståndet 1,0 x 1,0 m och 3 rutors överlapp. Dessa är oftast installerade i områden där spänningarna är höga och seismisk aktivitet är sannolik. En skadekartläggning orsakad av seismisk aktivitet genomfördes i LKAB´s undergjordsgruva Kiirunavaara. Där framkom det att de installerade näten antingen slits sönder av stenblock eller att överlappen ger med sig. En utvärdering utav LKAB´s nät har gjorts genom att testa dem i laborationsmiljö på Luleå Tekniska universitet. En test-ram byggdes, denna bultades fast i golvet för att vara styv. Mindre nätbitar om 1.2 x 1.2 m blev installerade i riggen och en last applicerade mellan fyra bultar in testserie AA. I test seria AB/AD påfördes lasten mellan två bultar, här undersöktes överlappats inverkan på nät-konfigurationen. I grund testet i serie AA uppnåddes en last om 41.4 kN och en deformering på 0.44 m innan första brottet noterades. Högst brottlast noterade när lastpåföringsplattans area ökade från 0.07 m2 till 0.5 m2, dvs 61.7 kN med endast en förskjutning på 0.26 m. Brottgränsområdet för testserie AA är mellan 32.4 kN – 61.7 kN där deformation är mellan 0.26 m -0.44 m, inom dessa områden varierades också lastpåföringsplattans material och lasten på bultarna som håller fast nätet. För testserie AB/AD är samma område 28.9 kN – 47.5 kN med deformationerna 0.19 m – 0.22 m. Grund testet med ett nät där lasten appliceras mellan två bultar har lägst brottområde, 28.9 kN vid 0.19 m. När lasten istället appliceras på ett överlapp ökar brottslasten till 47.5 kN vid en deformation om 0.22 m, styvheten i konstruktionen ökar också. Det är inte noterad någon större förändring om överlappen belastas med en dragande eller tryckande teknik. När mängden rutor reduceras till endast en ruta, observerades tendensen till separation av näten vid påföring utav last. Genom hela testuppställningen har två brottorsaker noterats, drag brott i vajer och brott i närhet utav uppvärmda områden, svetsar. I testserie AA har endast den senare brottorsaken noterats, dessa förekommer uteslutande i närhet till bultbrickorna. För testserie AB/AD är båda brottorsakerna är noterade. De förekom både vid bultbrickorna och vid lastpåföringsplattan. Testserie AA har problem med att fördela lasten efter ett första brott har uppsåt samt att svetsarna i nätet är den svagaste länken. High energy mesh och Roof mesh har påvisat goda egenskaper att lösa dessa två problem enligt tidigare genomförda tester. Någon utav dessa kan modifieras och testas med LKAB´s installationsmönster. För testserie AB/AD är de möjligt att härleda brott i överlappet till för hög lastkoncentration i de närmsta bultarna. En lastfördelning till närliggande bultar ses som en lösning, både seismiska nät och straps har dessa egenskaper. Dessa kan med fördel också testas installationsmönster för att utvärdera och förstå den komplexa installationen som uppstår.
Chifamba, Ronald. "Analysis of mining investments in Zimbabwe." Göteborg: Dept. of Economics, School of Economics and Commercial Law [Nationalekonomiska institutionen, Handelshögsk.], 2003. http://www.handels.gu.se/epc/archive/00003564/01/Chifamba.full.pdf.
Full textEmmett, Suzanne E. "Mineral elements in diet, health and disease : analysis of cow's milk and human tissue samples." Thesis, University of Surrey, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328657.
Full textFernandes, Adalton Mazetti [UNESP]. "Crescimento, produtividade, acúmulo e exportação de nutrientes em cultivares de batata (Solanum tuberosum L.)." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/86341.
Full textConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
A cultura da batata tem grande importância para o Brasil e para o Estado de São Paulo. Porém, apesar de sua importância, falta maiores informações sobre a fisiologia e nutrição mineral desta cultura, limitando a obtenção de elevadas produtividades, com alta qualidade e baixo custo de produção, já que as peculiaridades de cada cultivar podem fazer grande diferença no manejo. Além disso, as doses de fertilizantes normalmente utilizadas na cultura da batata são elevadas, o que gera grande impacto no custo de produção e riscos ambientais. Assim, para obtenção da máxima eficiência produtiva, faz-se necessário o conhecimento do desenvolvimento da planta e da absorção e acumulação de nutrientes nas diferentes fases de desenvolvimento. O objetivo deste trabalho foi avaliar o crescimento, acúmulo de nutrientes durante o ciclo, produtividade de tubérculos e exportação de nutrientes em cinco cultivares de batata. O delineamento experimental utilizado foi o de blocos casualizados, em esquema de parcela subdividida, com quatro repetições. As parcelas foram constituídas pelas cultivares (Ágata, Asterix, Atlantic, Markies e Mondial) e as subparcelas por épocas de coletas de plantas, que foram realizadas a cada 7 dias após a emergência até a colheita final. Cada parcela foi constituída por 10 linhas de 10 m de comprimento. Todas as cultivares tiveram crescimento lento até o início da fase de enchimento de tubérculos. Desta época até o final do ciclo ocorreu o desenvolvimento dos tubérculos, com a máxima taxa de acúmulo de MS concentrando-se no início dessa fase. A cultivar Mondial foi mais tardia em acumular MS, apresentando as maiores taxas de crescimento na fase final do ciclo.As cultivares Ágata, Atlantic e Markies apresentam crescimento semelhante durante todo o ciclo, porém...
The potato crop has great economical importance for Brazil and São Paulo State. However, despite its importance, it lacks more information about physiology and mineral nutrition of this crop, limiting to obtain high yield, high quality and low production cost, since the peculiarities of each cultivar can make difference in management. Furthermore, the fertilizers rates commonly used in potato crop are high, which has a strong impact on production costs and environmental risks. To get the maximum production efficiency, it is necessary to understand the development of the plant, uptake and accumulation of nutrients in different stages of the plant development. The objective of this study was to evaluate growth, nutrient accumulation, tubers yield and the nutrient exportation in five potato cultivars. The experimental design was the completely randomized block in split-plot with four replications. The plots treatments consisted of potato cultivars (Ágata, Asterix, Atlantic, Markies and Mondial) and subplots were established by harvest time of plants, were carried out every 7 day after emergence to last harvest. Each plot consisted of 10 lines of 10 m in length. All cultivars showed slow growth until the beginning of the tubers bulking stage. Since this time until the end of the cycle, occurred the tubers development, with maximum dry matter accumulation rate focusing in this initial stage. Mondial cultivar took longer time to accumulate dry matter, presenting the highest growth rates in the final stage of the cycle. Ágata, Atlantic... (Complete abstract click electronic access below)
Ferreira, Talita Cristina de Oliveira. "Análise de incertezas do modelo de teores associado aos investimentos de pesquisa de longo prazo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/44/44137/tde-17062016-095800/.
Full textMining projects require large amount of capital investment and most cases spend long periods of implementation, which make them extremely susceptible to several sources of uncertainty. Such uncertainties commonly tend to decrease along the project development. The present study aims to correlate the uncertainties associated to the grade model of the Sequeirinho copper mine with the amount of capital investment that has been spent along different geological surveys. Sequeirinho site is included in the context of Sossego Mine Complex, located in Canaã dos Carajás (PA, Brazil). Initially, 100 simulations were carried out for each lithologic domain in each drilling campaign (pre-1998, 1999, 2000, 2002 and 2003) using sequential Gaussian simulation conditioned to the sample, resulting in 1,400 possible scenarios. Three indexes were calculated for the uncertainty analysis: conditional variance, conditional coefficient variance and interquartile range. Finally, the evaluation of capital investment was elaborated from the costs estimated for drilling and chemical analysis. Since pre-1998 drilling campaign, deposit average grades have showed a trend to get closer to the possible real values observed in the final research surveys. In 2000, there was the biggest capital investment (about R$ 28 millions) and the uncertainty reduction has reached the maximum level of 15%. Investments performed in drilling programs after 2000 were around R$ 9 million (around 12,000 meters of drill holes), but the uncertainty reduction was not significant. Therefore, such investments might be used to discover new targets. Besides the correlation of uncertainty reduction and amount of capital investment, the main focus of this study, the uncertainty of geological model and the drillhole locations are important variables to be considered in investment analysis of geological survey.
Kappke, Jaqueline. "Medidas das concentrações de rádio em águas minerais disponíveis à venda no Brasil." Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/524.
Full textEste trabalho apresenta os resultados da pesquisa sobre medidas da atividade de 226Ra em águas minerais engarrafadas compradas em estabelecimentos comerciais do Brasil. As medidas foram realizadas no Laboratório de Física Nuclear Aplicada da Universidade Tecnológica Federal do Paraná em cooperação com o Centro de Desenvolvimento e Tecnologia Nuclear (CDTN) da Comissão Nacional de Energia Nuclear (CNEN). O trabalho avalia a possibilidade do uso do equipamento RAD7 (Durridge Company) para medir a atividade de 226Ra em equilíbrio com 222Rn presente nas amostras de águas em nível compatível com 0,1Bq/L, o que significa uma precisão superior à prática usual do equipamento. Além disso, a pesquisa fornece o erro mínimo de medida da concentração de atividade do rádio possível de ser atingida com o uso do equipamento RAD7. A principal dificuldade encontrada na técnica desenvolvida foi diminuir os erros associados às medidas. Para desenvolver a metodologia otimizada foram realizados diversos testes que propiciaram a diminuição dos erros e asseguraram uma técnica inovadora para medidas de baixas concentrações de 226Ra em água, com o uso do detector eletrônico de radônio RAD7. O arranjo experimental foi baseado no detector eletrônico de radônio RAD7 e as medidas foram realizadas utilizando o kit RAD H2O que permite identificar a atividade de concentração do 222Rn em pequenas amostras de 40mL e 250mL. Os resultados mostraram que o erro mínimo ficou entre 0,02 a 0,07 Bq/L o que configura uma diminuição considerável e importante nos erros associados às amostras de baixas concentrações. Quando aplicada a metodologia otimizada e proposta, foi possível concluir que todas as amostras analisadas apresentaram valores abaixo que os estabelecidos pelas normas e recomendações e que os valores encontrados para as amostras possuem ordem de grandeza semelhante às encontradas na literatura. Desta forma, foi possível concluir que o detector eletrônico de radônio RAD7 pode ser utilizado nas medidas de 226Ra em águas para concentrações menores que 0,1 Bq/L, mas que para isto deve ser utilizada uma técnica como esta desenvolvida para otimizar o procedimento.
This thesis presents the survey results of measuring the activity of 226Ra in bottled mineral waters purchased in Brazilian market. The measurements were performed at the Laboratory of Applied Nuclear Physics at Federal Technological University of Paraná in cooperation with the Centre for Development and Nuclear Technology (CDTN) of the National Nuclear Energy Commission (CNEN). The study evaluates the possibility of using RAD7 equipament (Durridge Company) in order to measure 226Ra activity in equilibrium with 222Rn present in water samples at a level compatible with 0.1 Bq/L, which means greater accuracy than the usual practice of the equipment. Furthermore, the search provides the minimum error of radio activity concentration that can be achieved using the RAD7 equipament. The main difficulty of this work was to reduce the associated errors to the measure. To develop the optimized methodology were performed several tests that enabled the reduction of errors and ensure an innovative technique for measuring low concentrations of 226Ra in water, using the RAD7 radon electronic¬ detector. The experimental setup was based on the RAD7 and measurements were performed using the RAD H2O kit that identifies the activity concentration of 222Rn in small samples of 250mL. The results showed that the minimum error ranged from 0.02 to 0.07 Bq/L which constitutes a considerable and significant reduction in errors associated with low concentrations samples. When applied the optimized methodology proposed, it was concluded that all the samples had values below the established standards and recommendations and that the values found for the samples have similar order of magnitude to those found in the literature. Thus, the RAD7 radon detector electronics can be used in measurements of 226Ra in water at concentrations below 0,1 Bq/L, but for that, the technique developed in order optimize the procedure should be used.
Meave-Flores, Gerardo 1953. "Investment portfolio analysis: Energy and gold-minerals." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/291766.
Full textFoulkes, Michael Edward. "Plasma spectrochemical analysis of slurries." Thesis, University of Plymouth, 1989. http://hdl.handle.net/10026.1/1928.
Full textKinnersjö, MIchaela. "Symbolic Responsibility : A Pathway analysis of the Swedish Mineral Strategy." Thesis, Umeå universitet, Statsvetenskapliga institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-142410.
Full textCrawford, Bethany. "Bone Mineral Density Analysis for Evaluation of Cervical Vertebral Maturation." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364805435.
Full textClose, Thomas Jr (Thomas Charles). "Kinetic analysis of leaching reactions in multi-component mineral systems." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130666.
Full textCataloged from the official PDF of thesis.
Includes bibliographical references (pages 167-177).
The rational design of reactive systems requires the use of kinetic models of system behavior. However, the development of such models for multicomponent systems is complicated by conditions of mutual interference in determining reaction rates. Addressing this shortcoming for mineral systems requires developing methods to solve the fundamental problem of identity and resolve the partitioning of system behavior between components. In this work a complete description of the problem of simultaneous rate determination under conditions of mutual interference is developed and progress towards solving this problem in microfluidic and bulk systems is presented. Results show that there are unique challenges posed in microfluidic systems that hinder the ability to accurately partition the behavior of the total system between its constituents. In contrast, the bulk system permits a practical experimental solution based on particle size and shape for certain classes of solid mixtures.
by Thomas Close.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Chemical Engineering
Nogueira, Sandra Prudente [UNESP]. "Relação entre o excesso de bases da dieta, sua manipulação mediante adição de cátions e anions e o pH urinário e equilíbrio ácido-básico de cães." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/89210.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A composição de macroelementos da dieta influencia o equilíbrio ácido básico e as características da urina de cães, contribuindo tanto para o desenvolvimento como prevenção de urolitíases. O experimento 1 teve por objetivo comparar fórmulas para estimar o excesso de bases (EB) do alimento, avaliando a influência do enxofre e dos aminoácidos sulfurados sobre estes cálculos e o equilíbrio ácido-basico de cães. O segundo e terceiro estudo objetivaram avaliar, respectivamente, os efeitos da adição de sal catiônico (citrato de potássio em duas doses, 150mEq/kg e 300mEq/kg de dieta) e compostos aniônicos (hexametafosfato de sódio, metionina e sulfato de amônio, em duas doses cada um, -150mEq/kg e -300mEq/kg) em dietas para cães. Os cães permaneceram em gaiolas metabólicas durante cinco dias de adaptação à dieta, seguidos por três dias de coleta de urina total. Durante a coleta, a urina produzida em cada período de 24 horas teve seu volume, densidade e pH aferidos. O equilíbrio ácido-básico foi estudado por hemogasometria de sangue venoso, em amostras coletadas às 8:00hs (antes do fornecimento do alimento) e 15hs (6 horas após alimentação). O primeiro experimento incluiu nove alimentos comerciais e nove cães, em um delineamento quadrado latino 9x9. O pH urinário variou entre 6,47±0,23 a 7,77±0,16, o EB entre 75 e 765 mEq/kg MS. Foi observada diferença média de -57 mEq/kg entre o EB calculado com enxofre (EBs) e o EB calculado com aminoácidos sulfurados, sendo o primeiro melhor estimativa do EB do alimento. O pH urinário apresentou alta correlação com o EBS (r=0,98; p<0,001). No segundo experimento houve aumento linear do pH urinário mediante adição de citrato de potássio (p<0,05), elevando-se o pH urinário de 5,97±0,19 (controle) a 7,11±0,11 (300mEq citrato de potássio/kg; p<0,001). No terceiro experimento foi verificada redução do pH urinário...
Food mineral composition influences the acid-basic balance and characteristics of dogs’ urine, contributing for both development and prevention of urolithiasis. The first experiment compared formulas to estimate food base excess (BE), evaluating the influence of total sulfur and sulfur amino acids on these calculations and acid-basic balance of dogs. The second and third experiments evaluated, respectively, the effects of addition of a cationic salt (potassium citrate in two doses, 150mEq/kg and 300mEq/kg of diet) and anionic compounds (sodium hexametaphosphate, methionine and ammonium sulphate, also in two doses, - 150mEq/kg and -300mEq/kg) in diets for dogs. Dogs were kept in metabolic cages for five days of adaptation phase to the diet, followed by three days of total urine collection. During collection, each 24 hours of produced urine were analyzed for density, volume and pH. Acid-basic balance was appraised by blood gas analysis of venous blood, in samples collected at 8:00h (before food consumption) and 15:00h (6 hours after meal). First experiment included nine commercial diets and nine dogs, in a Latin Square 9x9 design. The urinary pH varied between 6.47±0.23 to 7.77±0.16, BE between 75 and 765mEq/kg. A mean difference of -57mEq/kg was observed between BE calculations with sulfur (BEs) and BE calculations with sulfur amino acids, being the first formula a better tool to estimate food BE. The urinary pH presented high correlation with BEs (r=0.98; p<0.001). In second experiment was verified a linear increase of urinary pH by addition of potassium citrate (p<0.05), increasing the urinary pH from 5.97±0.19 (control) to 7.11±0.11 (300mEq potassium citrate/kg; p<0.001). In third experiment a reduction of urinary pH from 6.81±0.10 (control) to 5.45±0.23 (-300mEq/kg of ammonium sulphate; p<0.0001) was observed. Ammonium sulphate and methionine were effective in acidifying urine... (Complete abstract click electronic access below)
Shen, Yunxiang. "Risk analysis and its application in mining project evaluation." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64009.
Full textCai, Wenlong. "ZERO-ONE PROGRAMMING ANALYSIS OF MINE PRODUCTION SCHEDULING PROBLEMS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275401.
Full textTanner, Dominique. "In situ mineral geochemistry as a guide to ore-forming processes." Phd thesis, Canberra, ACT : The Australian National University, 2014. http://hdl.handle.net/1885/125140.
Full textAndrist, Rangel Ylva. "Quantifying mineral sources of potassium in agricultural soils /." Uppsala : Deptartment of Soil and Environment, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200853.pdf.
Full textDompieri, Mauricio. "Análise de complexidade aplicada à antecipação de crises no mercado de bens minerais." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-16112015-153204/.
Full textThis study aimed at investigating the opportunities for application of complexity analysis as a method of analysis of mineral commodities economics, using nickel as case study. With that intention, the particularities of commodities were studied, in a deeper fashion in the case of nickel, its influencing factors and respective models which have been developed for simulating, understanding and predicting the behavior of the commodity market system. The conditions which allow the mineral commodities market to be considered a complex system have been verified. In the case of nickel the current state of the extraction technology including the latest developments has also been analyzed. Then focus goes to the description of the method used in complexity analysis, where complexity of a system is defined as a measurable quantity based on its topology, represented by the structure of the correlation between its variables, and the total entropy of the system. The total entropy of the system is the integration of the Shannon entropy of the variables that participate in its structure and is a measure of the systems uncertainty, i.e., its departure from a deterministic operating fashion. Calculation of correlations between variables in this method is not done statistically, but by calculating the mutual entropy between each pair of variables. The advantage of this method is that it reveals correlations between pairs of variables that exhibit nonlinear relationships or even bifurcations, clustering and other pathologies of difficult statistical treatment. Thus, the term correlation is avoided, which refers to the statistical treatment, being coupling the preferred expression to identify the dependence between two variables. The two types of complexity analysis were then performed: static and dynamic. Static analysis reveals the system structure and strength of couplings between the components by means of a cognitive map, as well as the complexity indices consisting of critical complexity, operational and minimum entropy and robustness. Robustness is the most interesting index in this case, as it measures the resilience of the system using the difference between the critical and operative complexities, and is an indicator of its sustainability. The dynamic analysis reveals, for time variant systems, the evolution of complexity indicators over time. Interest in this type of analysis is that the methods developer has experimentally identified that the collapse of a system is almost always preceded by a sharp increase in their complexity. This feature is then exploited in the analysis of the nickel market in trying to anticipate crises. Then, in the experimental section, structures of couplings were identified for a basket of metals and for the specific nickel market, using static analysis. Finally the evolution of indicators of complexity over time has been investigated, which revealed to be possible to identify a crisis in the market by the increasing complexity and entropy and, in the particular case of the 2008-2009 crisis its been also was possible to observe a significant increase in complexity and entropy just before installation of the crisis itself, providing a pre-alarm of the event.
LOPES, Bruno Oliveira. "Análise numérica do processo de separação de partículas minerais em hidrociclone via CFD." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1502.
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A mineração é uma atividade econômica relevante em diversos países. No tratamento de minérios, a água é um insumo indispensável. Para a classificação de minérios, a indústria mineral tem usado o processo de hidrociclonagem, onde a água é utilizada como meio para o transporte de partículas de minério dispersas, que são separadas do líquido através da força centrífuga no interior do equipamento denominado de hidrociclone. O avanço constante do poder de processamento dos computadores em conjunto com a evolução nas técnicas e métodos numéricos tem permitido simular com grande precisão problemas complexos de fluidodinâmica tal qual o escoamento em hidrociclones. Neste sentido, este trabalho tem como objetivo estudar o processo de separação de partículas de minério em hidrociclones via software Ansys Fluent. Para a simulação fluidodinâmica utilizou-se uma modelagem matemática baseada em uma análise Euleriana-Lagrangeana. Resultados dos campos de pressão, velocidade, e fração volumétrica das fases, eficiência do processo de separação em diversas condições operacionais são apresentados e avaliados. Dos resultados verificou-se que o aumento da velocidade de escoamento na entrada do equipamento tende a aumentar o desempenho do hidrociclone na eficiência de separação até certo limite
Mining is a relevant economic activity in many countries. In the treatment of ores, water is an indispensable input. For the classification of ores, the mineral industry has used the hydrocyclone process, where water is used as the medium for transporting dispersed ore particles, which are separated from the liquid by centrifugal force inside the so-called hydrocyclone equipment. The constant advance of the processing power of the computers together with the evolution in the techniques and numerical methods has allowed to simulate with great precision complex problems of fluidodynamics like the flow in hydrocyclones. In this sense, this work aims to study the process of separation of ore particles in hydrocyclones using Ansys Fluent software. For the fluid dynamics simulation, a mathematical model based on an Eulerian-Lagrangian analysis was used. Results of pressure, velocity, and volumetric fraction phases, efficiency of the separation process under various operational conditions are presented and evaluated. From the results it has been found that increasing the flow velocity at the inlet of the equipment tends to increase the performance of the hydrocyclone in the separation efficiency to a certain extent.
Randolph, John Michael Jr. "Characterizing Flotation Response: A Theoretical and Experimental Comparison of Techniques." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35456.
Full textMaster of Science
Khachatryan, Hayk. "Spatial investigation of mineral transportation characteristics in the state of Washington." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/H_Khachatryan_122806.pdf.
Full textMacIver, Michael Ryan. "In situ mineral sediment characterization with light scattering and image analysis." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57743.
Full textApplied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
Sheikholeslami, Salmasi Kamaleddin. "Assessment and comparative analysis of Iran's mineral policy : lessons and recommendations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0030/NQ64667.pdf.
Full textCoomaraswamy, Kristian Sham. "Systematic analysis of mineral trioxide aggregate using a model cement system." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7229/.
Full textBerquist, C. R. Jr. "Stratigraphy and heavy mineral analysis in the lower Chesapeake Bay, Virginia." W&M ScholarWorks, 1986. https://scholarworks.wm.edu/etd/1539616565.
Full textHarrison, Christopher Bernard. "Feasibility of rock characterization for mineral exploration using seismic data." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/999.
Full textRedfern, S. E. "Atomistic simulation of mineral surfaces : their structure, hydration and growth." Thesis, University of Bath, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301964.
Full textShirazi, Hassan Haji Amin. "Application of image analysis to industrial minerals flotation." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362895.
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Full textIn 2002, two high resolution seismic lines, the East Victory and Intrepid, were acquired along with sonic logging, to assess the feasibility of seismic imaging and rock characterisation at the St. Ives gold camp in Western Australia. An innovative research project was undertaken combining seismic processing, rock characterization, reflection calibration, seismic inversion and seismic attribute analysis to show that volumetric predictions of rock type and gold-content may be viable in hard rock environments. Accurate seismic imaging and reflection identification proved to be challenging but achievable task in the all-out hard rock environment of the Yilgarn craton. Accurate results were confounded by crocked seismic line acquisition, low signal-to-noise ratio, regolith distortions, small elastic property variations in the rock, and a limited volume of sonic logging. Each of these challenges, however, did have a systematic solution which allowed for accurate results to be achieved.
Seismic imaging was successfully completed on both the East Victory and Intrepid data sets revealing complex structures in the Earth as shallow as 100 metres to as deep as 3000 metres. The successful imaging required homogenization of the regolith to eliminate regolith travel-time distortions and accurate constant velocity analysis for reflection focusing using migration. Verification of the high amplitude reflections within each image was achieved through integration of surface geological and underground mine data as well as calibration with log derived synthetic seismograms. The most accurate imaging results were ultimately achieved on the East Victory line which had good signal-to-noise ratio and close-to-straight data acquisition direction compared to the more crooked Intrepid seismic line.
The sonic logs from both the East Victory and Intrepid seismic lines were comprehensively analysed by re-sampling and separating the data based on rock type, structure type, alteration type, and Au assay. Cross plotting of the log data revealed statistically accurate separation between harder and softer rocks, as well as sheared and un-sheared rock, were possible based solely on compressional-wave, shear-wave, density, acoustic and elastic impedance. These results were used successfully to derive empirical relationships between seismic attributes and geology. Calibrations of the logs and seismic data provided proof that reflections, especially high-amplitude reflections, correlated well with certain rock properties as expected from the sonic data, including high gold content sheared zones. The correlation value, however, varied with signal-to-noise ratio and crookedness of the seismic line. Subsequent numerical modelling confirmed that separating soft from hard rocks can be based on both general reflectivity pattern and impedance contrasts.
Indeed impedance inversions on the calibrated seismic and sonic data produced reliable volumetric separations between harder rocks (basalt and dolerite) and softer rock (intermediate intrusive, mafic, and volcaniclastic). Acoustic impedance inversions produced the most statistically valid volumetric predictions with the simultaneous use of acoustic and elastic inversions producing stable separation of softer and harder rocks zones. Similarly, Lambda-Mu-Rho inversions showed good separations between softer and harder rock zones. With high gold content rock associated more with “softer” hard rocks and sheared zones, these volumetric inversion provide valuable information for targeted mining. The geostatistical method applied to attribute analysis, however, was highly ambiguous due to low correlations and thus produced overly generalized predictions. Overall reliability of the seismic inversion results were based on quality and quantity of sonic data leaving the East Victory data set, again with superior results as compared to the Intrepid data set.
In general, detailed processing and analysis of the 2D seismic data and the study of the relationship between the recorded wave-field and rock properties measured from borehole logs, core samples and open cut mining, revealed that positive correlations can be developed between the two. The results of rigorous research show that rock characterization using seismic methodology will greatly benefit the mineral industry.