Готові списки джерел за темами / Bauxite Analysis

Зміст

Статті в журналах
Дисертації
Книги
Частини книг
Тези доповідей конференцій
Звіти організацій

Добірка наукової літератури з теми "Bauxite Analysis"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Bauxite Analysis".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Bauxite Analysis"

Atakoglu, Ozge Ozer, and Mustafa Gurhan Yalcin. "Geochemical characterization of the Sutlegen bauxite deposit, SW Antalya." Mining of Mineral Deposits 15, no. 3 (September 2021): 108–21. http://dx.doi.org/10.33271/mining15.03.108.

Повний текст джерела

Анотація:

Purpose.The purpose is to determine geological and geochemical characteristics of the Sutlegen (Antalya, Turkey) bauxites, to identify the elements that played a major role in their formation. Methods. X-ray diffraction (XRD) mineral phase analysis, X-ray fluorescence (XRF) elemental analysis, plasma-mass spectrometry (ICP-MS), the petrographic and mineralogical analyses, and multivariate statistical methods were used. Findings. The major element content of the ore was determined as Al2O3 (60-35.2 wt%), SiO2 (39.5-0.2 wt%), Fe2O3 (48.4-19.5 wt%), TiO2 (36.9-16 wt%), and P2O5 (0.5-0.1 wt%). The Sutlegen region, which shows epirogenetic action with the uplift of the earth's crust, is generally rich in neritic carbonates. It was revealed that the bauxite ores have undergone moderate and strong laterization as a result of the deferruginization in the environment, and they were classified into four groups as lateritic, ferritic, kaolinitic, and bauxite. The increase in the aluminosilicate minerals, which were formed during the formation of bauxite in the environment was found to be directly proportional to the laterization processes. In this context, it was considered that the lateritic material that was firstly formed in the environment filled the cavities and pores of the karst-type limestones and sedimentary units in the region by superficial transfer phenomena. The bivariate diagrams of Log Cr vs. Log Ni revealed that the bauxite that formed in the region had an ultrabasic source. Originality. In literature, no scientific studies have been found on bauxite mineralization in the Sutlegen deposits that have been operated for a long period. Practical implications. In this context, the geochemical characteristics of bauxites revealed that the source of the laterization process in the region was the ultrabasic igneous rocks. The lateritic material moved by superficial transfer was accumulated on sandstone, claystone, siltstone, and limestone and in karstic cavities; then, it formed karstic bauxite (kaolinitic and bauxite) of different classifications due to the effect of metamorphism.

Стилі APA, Harvard, Vancouver, ISO та ін.

Thevi, T., and A. L. Abas. "Effects of Bauxite and Alumina Exposure on Incidence of Cancer - Meta-analysis." Kathmandu University Medical Journal 18, no. 4 (December 31, 2020): 414–19. http://dx.doi.org/10.3126/kumj.v18i4.49256.

Повний текст джерела

Анотація:

Bauxite is an ore from which Aluminium is produced. Malaysia, once the leading producer of bauxite has reduced production as mining activity has caused community outrage. Due to concerns about health concerns, rising pollution and environmental hazards, the government has revoked the licenses of bauxite miners. We therefore did a meta-analysis to assess the relationship between exposure to Bauxite and Alumina with incidence of various types of cancers. Bauxite mines and alumina refineries. Individuals of all ages exposed to Bauxite and Alumina. Exposure to bauxite and alumina. Incidence due to overall cancers and specific types of cancers. Exposure to bauxite and alumina did not cause variations in incidence of overall cancer and specific types of cancer such as cancer of lip, cancer of the oral cavity and pharynx, cancer of digestive organs and others. We conclude that there is no evidence that bauxite or alumina exposure cause increase incidence of cancer but due to the small number of studies included in this review, we recommend more cohort studies to be done in future.

Стилі APA, Harvard, Vancouver, ISO та ін.

Steiner, Timotheus Martin Christoph, Hans-Jürgen Gawlick, Frank Melcher, and Felix Schlagintweit. "Ophiolite derived material as parent rocks for Late Jurassic bauxite: evidence for Tithonian unroofing in the Northern Calcareous Alps (Eastern Alps, Austria)." International Journal of Earth Sciences 110, no. 5 (May 21, 2021): 1847–62. http://dx.doi.org/10.1007/s00531-021-02044-6.

Повний текст джерела

Анотація:

AbstractIn shallow-water limestones of the Plassen Formation in the Tirolic nappe of the Northern Calcareous Alps, bauxite was formed on karstified and tilted platform margin grainstones to boundstones around the ?Kimmeridgian/Tithonian boundary, or in the Early Tithonian as proven by Protopeneroplis striata Weynschenk, Labyrinthina mirabilis Weynschenk, and Salpingoporella pygmaea Gümbel. The platform established on top of the obducted ophiolite nappe stack. The onset of unroofing at the Kimmeridgian/Tithonian boundary exposed ophiolites to weathering, forming laterites, and bauxites. The weathered ophiolitic material was shed on the tilted, emerged, and karstified platform, where the bauxite accumulated. Continued subsidence led to flooding, and a Tithonian transgressive carbonate sequence sealed the bauxites. XRD analysis of the bauxite yields a composition of mainly boehmite with hematite and some berthierine, kaolinite, and chromite. SEM analysis verified magnetite, hematite, rutile, chromite, zircon, ferropseudobrookite, ilmenite, monazite, xenotime, and garnet distributed in pisoids and within the matrix. The pisoids reach a millimeter in size and partly show cores of older, larger pisoids. The composition of the chromites indicates an ophiolitic origin. Geochemical examination using major- and trace elements points to a mafic andesitic to basaltic parent material contaminated with highly fractionated rocks from an island arc. Formation of Early Tithonian bauxites in shallow-water limestones confirms Middle to Early Late Jurassic ophiolite obduction. This was followed by uplift and unroofing of the orogen from the Kimmeridgian/Tithonian boundary onwards after a period of relative tectonic quiescence with an onset of carbonate platforms during the Kimmeridgian on top of the nappe stack and the obducted Neo-Tethys ophiolites.

Стилі APA, Harvard, Vancouver, ISO та ін.

Cui, Tao, Yang Quan Jiao, and Xiao Mei Wang. "Analysis on Sedimentary Environment of Bauxite in Wuchuan-Zheng’an-Daozhen Area, Northern Guizhou." Advanced Materials Research 616-618 (December 2012): 1409–15. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.1409.

Повний текст джерела

Анотація:

The sedimentary environment of bauxite in Wuchuan-Zheng’an-Daozhen Area has been debated for a long time. Through research on the element B, the sedimentary characteristics of bauxite, the distribution of four different natural types of bauxite and reference paleogeographic data we concluded that bauxite in Wuchuan-Zheng’an-Daozhen Area was a typical sedimentary deposit, with a provenance mainly from south-west. Bauxite was formed in an anoxic bay, which was partly closed and open to north. The sedimentary environment shifted between lacustrine and bay environments, accompanying frequent transgression and regression cycles.

Стилі APA, Harvard, Vancouver, ISO та ін.

Sojien, Taylor Moise, Estelle Lionelle Tamto Mamdem, Armand Sylvain Ludovic Wouatong, and Dieudonne Lucien Bitom. "Mineralogical, Geochemical and Distribution Study of Bauxites in the Locality of Bangam and Environs (West Cameroon)." Earth Science Research 7, no. 1 (January 24, 2018): 117. http://dx.doi.org/10.5539/esr.v7n1p117.

Повний текст джерела

Анотація:

The bauxite duricrust in the Bangam and surroundings is classified into three major storey levels as follows: the upper level on top of the plateaus where the continuous bauxites outcrop in slabs over distances of about 1 km, the intermediate level on top and at the flanks of the hills where the bauxites flush in metric blocks, the lower level at the talwegs where bauxites duricrust are gravels. The average thickness of the duricrust is 9.6m and extends over an area of about 9.5km2. Five types of facies are encountered here: nodular, pisolitic, pseudobreccia, vacuolar and massive. These different facies were carried out by X-ray fluorescence spectrometry, X-ray diffractometric, thermal analysis (ATD / ATG) and by polarizing microscope observation. The results of these analyses show that, gibbsite is the dominant mineral; kaolinite, anatase, hematite, goethite, magnetite and ilmenite are also present. The chemical composition of the major elements that characterize bauxites are 38-60% Al2O3; 2 -22% SiO2 and 9-42% Fe2O3. These values are almost similar to those obtained in Doumbouo-Fokoué, Ghana, Ngaoundal, and Minim-Martap precisely at Briskok prospect. The different minerals paragenesis and geochemistry data show that, the Bangam locality is a bauxite ore deposit in spite of a high content of iron and silicate of some facies, nevertheless, these can be used in some industries.

Стилі APA, Harvard, Vancouver, ISO та ін.

Melo, Caio C. A., Rômulo S. Angélica, and Simone P. A. Paz. "A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data." Minerals 11, no. 10 (September 28, 2021): 1054. http://dx.doi.org/10.3390/min11101054.

Повний текст джерела

Анотація:

Available Alumina (AvAl2O3) and Reactive Silica (RxSiO2), the main parameters of bauxite controlled in the beneficiation process are traditionally measured by laborious, expensive, and time-consuming wet chemistry methods. Alternative methods based on XRD analysis, capable to provide a reliable estimation of these parameters and valuable mineralogical information of the ore, are being studied. In this work, X-ray diffraction data in transmission mode was used to estimate AvAl2O3 and RxSiO2 from Brazilian bauxites using the Partial Least Square Regression (PLSR) statistical tool. The proposed method comprises a routine of sample classification according to their similarities by Principal Component Analysis (PCA) and K-means, calibration of the PLSR model for each group of samples, grouping new bauxite samples according to the generated clustering model, and subsequent estimation of the parameters AvAl2O3 and RxSiO2 using the PLSR models for these samples. The results showed good accuracy and precision of the models generated for samples of the main ore lithology. The quality and pre-processing of the XRD data required for this method are discussed. The results demonstrated that this method has the potential to be industrially applied to quality control of bauxites as a rapid and automated procedure.

Стилі APA, Harvard, Vancouver, ISO та ін.

Abdulvaliyev, R. A., S. B. Dyussenova, A. I. Manapova, A. Akcil, and U. Zh Beisenbiyeva. "Modification of the phase composition of low-grade gibbsite-kaolinite bauxites." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 317, no. 2 (June 15, 2021): 94–102. http://dx.doi.org/10.31643/2021/6445.22.

Повний текст джерела

Анотація:

The known methods of processing low-quality bauxite have a number of disadvantages that make it difficult or impossible to use them in the conditions of production of JSC "Aluminum of Kazakhstan", therefore, it is necessary to effectively develop a technology for preliminary enrichment. Enrichment of low-quality bauxites is possible by separating the clayey - high-siliceous and coarse-crystalline fractions. Electron-microscopic analysis of the original bauxite showed that the coarse-crystalline fraction is tightly pressed by the fine one. The total silicon modulus of the sample is 2.49. The silicon modulus of the fine fraction is 2.19, and that of the coarse fraction is 3.89. When enriching bauxite, as a result of the separation of fines, it is possible to increase the silicon modulus. After the chemical activation of bauxite in a sodium bicarbonate solution, the finely dispersed fraction is effectively separated from the coarse one and the phase composition changes - the calcium silicate phase disappears and the calcite phase is formed. With an increase in the activation temperature, the content of kaolinite and siderite decreases, and the content of quartz and hematite increases. Studies have shown that at temperatures of chemical activation of 120 ° C, duration of more than 120 minutes and 200 ° C, duration of more than 40 minutes, a dawsonite phase is formed in bauxite, which densifies the mineral structure. When determining the optimal regime for carrying out chemical activation, it is necessary to take into account the negative possibility of dawsonite formation.

Стилі APA, Harvard, Vancouver, ISO та ін.

Dobra, Gheorghe, Anatoly Kiselev, Laurentiu Filipescu, Vicol Alistarh, Nicolae Anghelovici, and Sorin Iliev. "Full Analysis of Sierra Leone Bauxite and Possibilities of Bauxite Residue Filtration." Journal of Siberian Federal University. Engineering & Technologies 9, no. 5 (August 2016): 643–56. http://dx.doi.org/10.17516/1999-494x-2016-9-5-643-656.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Fang, Bin Zheng, Hui Li, Jian Wei Cao, Jian Feng Wu, Xiao Hong Xu, and Xi Dong Wang. "Structure and Performance of Calcined Bauxite." Advanced Materials Research 887-888 (February 2014): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.305.

Повний текст джерела

Анотація:

In order to further broaden the application field of calcined bauxite, using differential thermal analysis-thermo-gravimetry (DTA-TG), X-ray diffraction analysis (XRD), Scanning electron microscopy (SEM) and other testing technology to study and analysis on the high temperature performance of calcined bauxite in this paper. The results show that the main crystal phases of calcined bauxite are corundum and mullite, appearance is layered, granular distribution. Due to the thermal performance of calcined bauxite is optimal, and is expected to be used for the field of high temperature solar thermal heat storage material.

Стилі APA, Harvard, Vancouver, ISO та ін.

Cui, Tao. "Mineralizaton Process of the Bauxite in WZD Area." Advanced Materials Research 989-994 (July 2014): 1269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.1269.

Повний текст джерела

Анотація:

This paper has a comprehensive analysis on mineralizaton process of the bauxite in Wuchuan-Zheng, an-Daozhen (WZD) area, northern Guizhou, China through synthesize former research. Geologic characteristic demonstrates that WZD bauxite is a typical sedimentary deposit, minerogenetic material have experienced a transporting process. Sedimentary environment of WZD bauxite is transition facies. Sedimentary environment is reduced and acidic. Accompanying frequent transgression and regression, bauxite has suffered a leaching process. In the leached period, environment is oxidized and acidic. Leaching process is the most important factor for the information of high grade bauxite. WZD bauxite has experienced several times leaching resulting in the great runoff of Fe and Si. Actually the metallogenetic process of WZD bauxite is a process that Al relative enrichment but Si and Fe runoff.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Дисертації з теми "Bauxite Analysis"

Gostu, Sumedh. "Investigation Of Chemical Processes For The Production Of Commercially Viable High Volume Value-Added Products From Bauxite Residue." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/531.

Повний текст джерела

Анотація:

Bayer processing of bauxite employed for production of alumina yield a residue red-mud. The worldwide annual-rate of red-mud generation is approximately 120 million tons, and most of this is stockpiled. Red mud is rich in elements like aluminum, titanium and rare earths, in addition to the major iron-bearing constituents. The objective of this research is to explore such a strategy to extract Iron as fine particulate magnetite. Pyrometallurgical reduction experiments using carbon mixtures and a novel hydrometallurgical route are experimented. Reduction experiments performed with petroleum coke as a reductant resulted in incomplete reduction. The Â‘optimal conditionsÂ’ for gaseous state reduction are determined to be: a processing temperature of 540oC Â± 10oC, partial pressures CO (g) and CO2 (g) each of 0.070atm (bar) Â± 0.001atm.(bar)/ inert diluent-gas: N2 (g), for a conversion-time of 30min. A mathematical-model was developed on the basis of unidirectional-diffusion of CO2 (g) within the CO2 (g)Â–CO (g)Â–N2 (g) gas-phase of the porous product-layer. Magnetic separation applied to the optimally reduced sample in: obtaining a magnetic portion with high iron and non-magnetic portion containing nonferrous (Al, Ti) is not successful. This finding was subsequently attributed to the nanometer length-scales crystallites of the predominant iron-containing phase, hydrated ferric-oxide(s) as determined by STEM micrographs. In addition, the presence of substitution for Fe3+ by Al3+ and Ti3+/4+ are determined with the help of MÃ–ssbauer spectrograms. A hydrometallurgical route involving selective leaching and precipitation of iron in red-mud is tried. Red-mud is leached in oxalic acid at: 95˚C, 15 % Pulp density, 2.5 h leaching time, 1.5 pH. Kinetic studies yielded the leaching mechanism to be predominantly fluid film control. Ferric oxalate in the leach liquor is reduced to insoluble ferrous oxalate selectively using Iron powder. The ferrous oxalate formed is ~98 % pure. The precipitated ferrous oxalate is magnetically separated and reduced in Nitrogen atmosphere to form fine particulate magnetite. Additionally an economic feasibility study was conducted for the hydro and pyro alternatives to produce magnetite using Monte Carlo Simulations by imparting uncertainties in various input cost components. A traditional process was also compared to the proposed approaches for Total Capital Investment (TCI), Total Product Cost (TPC), Net Present Value (NPV) and sensitivity analysis. ~52 % reduction in Total product cost, 46 % reduction in Total Capital Investment was achieved for the hydrometallurgical process when compared to the traditional approach.

Стилі APA, Harvard, Vancouver, ISO та ін.

Deursen, Caio Moreira Van. "Métodos de desaguamento e disposição de rejeito da bauxita: estudo de caso e avaliação econômica." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-23022017-103826/.

Повний текст джерела

Анотація:

Cerca de 230 milhões de toneladas de bauxita são produzidas por ano e, destas, 60 milhões são provenientes de operações que beneficiam esta bauxita usando água como meio para separar as frações mais finas. Como consequência do beneficiamento, estima-se que mais de 25 milhões de toneladas de rejeito sejam dispostas todo ano. Estas frações têm grandes quantidades de caulinita, um argilomineral de difícil desaguamento. Estes sólidos estão tipicamente em uma suspensão com água a cerca de 15% de concentração em massa antes de operações de desaguamento. As formas de desaguamento variam, bem como as opções de disposição. Este texto discorre sobre opções de desaguamento como sedimentação natural, espessamento, filtragem e centrifugação. Também se discorre sobre alternativas de disposição. Estas são condicionadas pela concentração de sólidos do material a ser disposto e são a disposição hidráulica em diques ou reaterro na mina. Após a descrição de cada uma das alternativas, são feitas análises de combinações destas formas de desaguamento e disposição, além de uma avaliação do fluxo de caixa livre descontado acumulado para cada uma. Esta abordagem, feita para um caso específico, permite avaliar qual opção implica em menor despesa financeira para a operação. Foram feitas considerações para avaliar características não econômicas de cada uma das operações, como o consumo de água, área ocupada pelo depósito, perigos de cada opção e seus descomissionamentos. A opção que apontou menor desembolso no período da operação, bem como a minimização de perigos, é o desaguamento com centrífugas e disposição do material reaterrando áreas lavradas.
More than 230 million tonnes of bauxite are produced each year and, from these, nearly 60 million come from operations that use water to beneficiate the ore, separating the finer fractions. By reason of this mineral treatment, it is estimated that more than 25 million dry tonnes of reject are disposed each year. The finer fractions have high kaolinite concentrations, a challenging to dewater mineral. These solids are typically in a suspension with about 15% solids concentration in mass before any dewatering. Both the dewatering options and disposal possibilities may vary. This text discusses dewatering options such as natural settling, thickening, filtering and centrifugation. It also describes alternatives of disposing the material. These options depend on the water concentration and consist of hydraulic disposition or using the dewatered material as mine backfill. After describing each alternative, an analysis of possible combinations among those is made along with an accumulated discount free cash flow evaluation for each one. Considerations were made to evaluate non-economic characteristics of each operation including the water consumption, surface occupied, operational hazards, decommissioning and closure. The option that has shown the lowest cost during the life of the operation, simultaneously reducing operational hazards is dewatering with centrifuges and using the material as backfill in mined out areas.

Стилі APA, Harvard, Vancouver, ISO та ін.

Yu, Jia. "Determinants and Impacts of Chinese Outward Direct Investment in Africa and a Case Study of Chinese Investment in Mining Sector in Guinea." Thesis, Clermont-Ferrand 1, 2013. http://www.theses.fr/2013CLF10415.

Повний текст джерела

Анотація:

Avec la croissance rapide de l’économie chinoise, les IDE chinois augmentent aussi très vite. De plus en plus études commencent à rechercher les déterminants et les impactes des IDE sortant chinois. Ce papier focalise sur les IDE chinois en Afrique, les motivations et les impactes en comparant avec les autres investissements du reste du monde. Plus intéressant, une étude de cas d’un projet chinois dans le secteur minier en Guinée va être présentée à la fin de la thèse au point de vue des investisseur chinois au niveau industriel et les implications politiques sont tirées à la base des résultats obtenus dans des parties empiriques au niveau macro. Le premier chapitre présente une situation générale du développement de l’IDE chinois et surtout celui en Afrique ; les deuxième et troisième parties sont les deux parties empiriques concernant les déterminants et les impactes de l’IDE chinois en Afrique ; et une étude de cas à la fin
With rapid Chinese economic growth, the China’s foreign direct investment has as well grown very quickly. More and more studies focus on the determinants and impacts of Chinese outward FDI (OFDI). This thesis targets the Chinese OFDI in Africa, its investment motivations and the impacts to the African host countries compared with other investments from the rest of the world. More interestingly, a case study of a Chinese mining project in Guinea is well presented on the perspective of a Chinese investor’s point of view at industry micro level and the policy implications are drawn based on the empirical results gained from the former chapters at macro level. The first chapter presents the general situation of China’s OFDI, especially that in Africa; while the second and the third chapters are the two empirical parts of determinants and impacts studies; followed by a case study in the final chapter

Стилі APA, Harvard, Vancouver, ISO та ін.

Lima, Juliano de. "Simulação numérica do processo de alteamento de áreas de deposição de resíduos pelo método a montante." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5648.

Повний текст джерела

Анотація:

A previsão do comportamento de resíduos constituiu-se em um desafio geotécnico, uma vez que estes materiais apresentam uma resposta distinta dos materiais usualmente encontrados em depósitos naturais. A análise dos recalques da fundação, decorrentes da sobrecarga imposta pelo alteamento, é complexa, tendo em vista que o adensamento de resíduos pressupõe grandes deformações, invalidando o uso de teorias clássicas de adensamento. Atualmente, no Brasil, a técnica de disposição de resíduos de bauxita prevê uma operação inicial de lançamento no interior de lagos artificiais, em forma de polpa. Após o esgotamento do lago e ressecamento do resíduo, inicia-se o lançamento pelo método a montante. Neste método, a polpa é lançada sobre o resíduo pré-existente, que se encontra em processo de adensamento. O presente trabalho tem como objetivo reproduzir numericamente o comportamento de áreas de resíduos durante a etapa de alteamento a montante. A pesquisa tem como enfoque 2 áreas de resíduos de bauxita. Uma delas encontra-se em fase de reabilitação e dispõe de instrumentação de campo (recalques e deslocamentos horizontais). A outra se encontra em fase de operação do alteamento e dispõe de dados experimentais. Desta forma, a metodologia consistiu na reprodução numérica do processo de alteamento da área instrumentada e comparação dos resultados com a instrumentação de campo, com objetivo de avaliar o modelo numérico e os parâmetros do resíduo. Posteriormente, realizou-se a previsão do comportamento do resíduo de fundação da área em fase de alteamento. Os parâmetros geotécnicos foram definidos a partir de um extenso programa de ensaios de campo e laboratório, executado no local em estudo, fazendo-se uso de um tratamento estatístico dos dados experimentais. Os resultados numéricos mostraram a potencialidade do programa na previsão do comportamento de áreas de resíduos durante o alteamento a montante, com previsões de recalques e deslocamentos horizontais coerentes com a instrumentação de campo.
The prediction of solid wastes behavior is a challenge for geotechnical engineers, since its response differ from the materials usually found in natural deposits. The analysis of the settlements of the foundation, due to the embankment raising is complex. Tailings undergo large settlements, which cannot be evaluated by ordinary consolidation theories. In Brazil, bauxite tailings are initially discharged into impoundment areas in a slurry form. After achieving the storage capacity of the reservoir, the tailing is allowed to dry, in order to enhance its resistance. Subsequently, the embankment is raised by the upstream method, and the mud is discharged on top of a material which is undergoing a consolidation process. The present research aims at reproducing numerically the response of bauxite tailings due to an upstream raising operation. The research focused 2 impoundment areas at same site. One area is being environmentally rehabilitated and is instrumented with vertical and horizontal gauges. The other is still in operation and an experimental investigation was carried out at this site. The methodology consisted of simulating the sequence of embankment raises and comparing the results with field instrumentation, in order to evaluate the numerical model and waste parameters. Subsequently, the behavior of the foundation of the area undergoing a raising embankment operation was evaluated. The geotechnical parameters were defined according to a statistical treatment of results of the experimental program (field and laboratory). The vertical and horizontal displacements, predicted by the numerical simulation, fitted reasonably well with field instrumentation and showed the inherent potential of the numerical modeling.

Стилі APA, Harvard, Vancouver, ISO та ін.

Veleba, Ondřej. "Studium vlivu složení na mechanické vlastnosti vysokohodnotného betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216217.

Повний текст джерела

Анотація:

This work is devoted to study the influence of the composition on mechanical properties of high performance concret based on portland cement. 29 samples of high performance concrete (HPC) warying in composition were prepared. The constituents used for HPC preparation were: cement Aalborg White, silica fume, finelly ground blast furnace slag, finelly ground silica, calcinated bauxite and polycarboxylate based superplasticizer. The mechanical parameters (flexural and compressive strength) of the samples were observed after 7 and 28 days of moist curing. Compressive strength values after 28 days were in the range of 92 to 194 MPa and the flexural strength values were in the range of 7 to 23 MPa (without using of fiber reinforcement). The graphs showing mechanical parameters depending on the mixture composition were constructed and consequently evaluated.

Стилі APA, Harvard, Vancouver, ISO та ін.

Palmer, Sara Jane. "Stability of hydrotalcites formed from Bayer refinery environmental control processes." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/48672/1/Sara_Palmer_Thesis.pdf.

Повний текст джерела

Анотація:

Bauxite refinery residues (red mud) are derived from the Bayer process by the digestion of crushed bauxite in concentrated sodium hydroxide at elevated temperatures and pressures. This slurry residue, if untreated, is unsuitable for discharge directly into the environment and is usually stored in tailing dams. The liquid portion has the potential for discharge, but requires pre-treatment before this can occur. The seawater neutralisation treatment facilitates a significant reduction in pH and dissolved metal concentrations, through the precipitation of hydrotalcite-like compounds and some other Mg, Ca, and Al hydroxide and carbonate minerals. The hydrotalcite-like compounds, precipitated during seawater neutralisation, also remove a range of transition metals, oxy-anions and other anionic species through a combination of intercalation and adsorption reactions: smaller anions are intercalated into the hydrotalcite matrix, while larger molecules are adsorbed on the particle surfaces. A phenomenon known as ‘reversion’ can occur if the seawater neutralisation process is not properly controlled. Reversion causes an increase in the pH and dissolved impurity levels of the neutralised effluent, rendering it unsuitable for discharge. It is believed that slow dissolution of components of the red mud residue and compounds formed during the neutralisation process are responsible for reversion. This investigation looked at characterising natural hydrotalcite (Mg6Al2(OH)16(CO3)∙4H2O) and ‘Bayer’ hydrotalcite (synthesised using the seawater neutralisation process) using a variety of techniques including X-ray diffraction, infrared and Raman spectroscopy, and thermogravimetric analysis. This investigation showed that Bayer hydrotalcite is comprised of a mixture of 3:1 and 4:1 hydrotalcite structures and exhibited similar chemical characteristic to the 4:1 synthetic hydrotalcite. Hydrotalcite formed from the seawater neutralisation of Bauxite refinery residues has been found not to cause reversion. Other components in red mud were investigated to determine the cause of reversion and this investigation found three components that contributed to reversion: 1) tricalcium aluminate, 2) hydrocalumite and 3) calcium hydroxide. Increasing the amount of magnesium in the neutralisation process has been found to be successful in reducing reversion.

Стилі APA, Harvard, Vancouver, ISO та ін.

Paz, Simone Patricia Aranha da. "Desenvolvimento e otimização de métodos de controle de qualidade e de processo de beneficiamento para bauxitas gibbsíticas tipo-Paragominas." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-22092016-100712/.

Повний текст джерела

Анотація:

Desde a prospecção do minério bauxita, passando pelo seu beneficiamento até a sua entrada no processo Bayer, tem-se como principais índices de qualidade e de processo os parâmetros químicos: alumina aproveitável (Al2O3Ap) e sílica reativa (SiO2Re), determinados segundo um procedimento que simula a digestão Bayer em escala de laboratório. Uma grande inovação para a indústria da bauxita seria fazer o controle por parâmetros mineralógicos, % gibbsita e % caulinita, via difratometria de raios X, intenção buscada nesse trabalho pela proposta de um método combinado Rietveld-Le Bail-Padrão Interno, cujos resultados são bem promissores para bauxitas gibbsíticas tipo-Paragominas, matriz para qual foi desenvolvido. Tal combinação não só melhorou a qualidade da quantificação de gibbsita e caulinita, como diminuiu o peso de cálculo tornando o procedimento mais prático e rápido. A alta correlação (r2=0,99) entre os resultados mineralógicos pelo método combinado e os resultados químicos pelo método tradicional, os deixam em igual escolha, pois foram iguais estatisticamente. No entanto, ressalta-se que o método tradicional subestima o valor de caulinita pela conversão da SiO2Re, enquanto o método combinado se aproxima mais do valor verdadeiro. Obter um resultado pelo método combinado mostrou ser mais prático e rápido que pelo método tradicional. Enquanto o tempo total estimado pelo combinado é < 3 h, pelo tradicional é de no mínimo 6 h. Como proposta de validação do método combinado, um segundo foi desenvolvido para quantificação de Al-goethita por DSC, o qual mostrou boa precisão. E muito embora o uso da técnica no controle industrial seja pouco provável por questões de praticidade e tempo de análise, usá-la na validação de antigos e novos métodos de quantificação mineralógica de bauxitas pode ser muito útil. A ordem crescente de substituição de Fe por Al pretendida pelas sínteses planejadas (7 variedades) foi confirmada pelos resultados de DRX, FRX, DSC e MEV, e assim um pequeno banco de dados de entalpias padrão de desidroxilação de Al-goethitas foi estabelecido. A produção de padrões complexos, misturas de variedades goethíticas, é tão importante quanto produzir uma só goethita, pois tais misturas são termodinamicamente comuns na natureza e, portanto, comuns em bauxitas. Após uma identificação clara da limitação do método tradicional para estimar caulinita pela conversão de SiO2Re em bauxitas tipo-Paragominas, um estudo de otimização do método Alcan foi realizado com base em um planejamento fatorial completo 23. As variáveis escolhidas foram temperatura, concentração cáustica e tempo para duas situações: bauxita com baixa SiO2Re e bauxita com alta SiO2Re. A temperatura foi a variável mais importante, apresentando um efeito positivo sobre a quantidade de SiO2Re, uma vez que o aumento na temperatura aumentou a taxa de conversão completa de caulinita em sodalita. Modelos empíricos de 1ª ordem foram apropriadamente obtidos para predição da quantidade de SiO2Re como função da temperatura, concentração cáustica e tempo, os quais responderam com as seguintes condições ótimas: (1) sem presença significante de quartzo - temperatura de 180 °C, concentração cáustica de 10 % com tempo de 60 min para baixa SiO2Re e 25 min para alta SiO2Re, e (2) com presença significante de quartzo - temperatura de 150 °C, concentração cáustica de 20 % e tempo de 60 min, para ambas as situações estudadas.
In the bauxite industry - exploration, beneficiation and refinery - two main chemical parameters are used for the quality control: available alumina (AvAl2O3) and reactive silica (RxSiO2). They are determined by a procedure that simulates the Bayer process in laboratory scale. A great innovation for this industry would be to make this control by mineralogical parameters, i.e., the % of gibbsite and % of kaolinite via Powder X-ray Diffraction Analysis. This is one of the main purposes of this work by means of a combined Rietveld-Le Bail-Internal Standard Method, whose results were very promising for the Paragominas-type bauxites. This combination not only improved the quality of gibbsite and kaolinite quantification, as decreased computer processing time, making it a more convenient and fast procedure. The high correlation (r2=0.99) between the mineralogical results from the combined method and chemical results by the traditional method, leave them the same choice, as they were statistically equal. However, it is noteworthy that the traditional method underestimates the kaolinite value obtained from the conversion of RxSiO2, while the combined method is closer to the true value. Obtaining a result by the combined method proved to be more convenient and faster (< 3 hours) than the traditional method (at least 6 hours). As a validation for the proposed combined method, a second method was developed to quantify Al-goethite by DSC, which showed good accuracy. Although the use of DSC technique in industrial control is unlikely for practical reasons and analysis time, its use can be very helpful in the validation of old and new methods for the mineralogical quantification of bauxites. XRD, XRF, DSC and SEM results confirmed the increasing order of Al for Fe replacement intended for the planned synthesis (7 types). Thus, a small database of standard enthalpies of Al-goethites dehydroxylation was built. The production of standards of goethites mixtures is as important as producing a single goethite standard, because these are thermodynamically common in nature and thus bauxites with complex mixtures of goethites are also common. After clearly identifying the limitations of the traditional method to estimate kaolinite from the conversion of RxSiO2 in the Paragominas-type bauxites, an optimization study of the Alcan method was carried out based on a 23 full factorial design. The chosen variables were temperature, caustic concentration and time, for two main situations: bauxite with low RxSiO2 and bauxite with high RxSiO2. The temperature was the most important variable, with a positive effect on the amount of RxSiO2, since the increase in temperature increased the rate of full kaolinite to sodalite conversion. First-order empirical models were properly obtained to predict the amount of RxSiO2 as a function of temperature, caustic concentration and time, which responded to the following optimal conditions: (1) without significant amount of quartz - 180 °C, NaOH 10 % and 60 min for low RxSiO2 and 25 min for high SiO2Re, and (2) with significant amount of quartz - 150 °C, NaOH 20 % and 60 min for both situations.

Стилі APA, Harvard, Vancouver, ISO та ін.

Madourie, Michigan Anthony. "A Comparative Analysis between Portuguese and Jamaican Bauxite Rocks: Their Geo-Economic Potential for the Aluminum Industry." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/69213.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Madourie, Michigan Anthony. "A Comparative Analysis between Portuguese and Jamaican Bauxite Rocks: Their Geo-Economic Potential for the Aluminum Industry." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/69213.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Книги з теми "Bauxite Analysis"

Research Unit for Livelihoods and Natural Resources (Hyderabad, India) and Centre for Economic and Social Studies, Hyderabad, eds. Bauxite mining in Koraput Region of Odisha: Socio-economic impact analysis. Hyderabad: Research Unit for Livelihoods and Natural Resources, 2013.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Aylmore, M. G. Mineralogy of Darling Range bauxites in relation to chemical reactivity, new ore types: Results of research carried out as MERIWA Project No. 90 in the Soil Science and Plant Nutrition Department of the School of Agriculture, the University of Western Australia. East Perth, WA: Minerals and Energy Research Institute of Western Australia, 1991.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Gilkes, R. J. Mineralogy of Darling Range bauxites: Forms of Al in pisolitic ore : results of research carried out as part of MERIWA Project No. 90 in Soil Science and Plant Nutrition, the University of Western Australia. East Perth, WA: Minerals and Energy Research Institute of Western Australia, 1995.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Частини книг з теми "Bauxite Analysis"

Antoniassi, Juliana Lívi, Henrique Kahn, Carina Ulsen, and Maria Manuela M. L. Tassinari. "Prediction of Mineral Processing Behavior of Bauxite Ores by XRD Cluster Analysis." In Proceedings of the 10th International Congress for Applied Mineralogy (ICAM), 9–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27682-8_2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Qiuyue, ZHAO, ZHANG Zimu, ZHU Xiaofeng, LIU Yan, LV Guozhi, ZHANG Ting'an, and WANG Shuchan. "Economic Analysis of Producing Alumina with Low-Grade Bauxite (Red Mud) by Calcification-Carbonization Method." In Light Metals 2014, 165–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch29.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Qiuyue, Zhao, Zhang Zimu, Zhu Xiaofeng, Liu Yan, Lv Guozhi, Zhang Ting’an, and Wang Shuchan. "Economic Analysis of Producing Alumina with Low-Grade Bauxite(Red Mud) by Calcification-Carbonization Method." In Light Metals 2014, 165–68. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48144-9_29.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Wibowo, Gembong Suryo, and Endry Burhanuddin Nauval. "Analysis of Quarterly Production Scheduling Using Ore Blending Strategy Case Study Pit 7A and 15 Block a Tayan Bauxite Mine, PT ANTAM (Persero) Tbk." In Mine Planning and Equipment Selection, 1029–36. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02678-7_99.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Cahyaningsih, Catur, Arrachim Maulana Putera, Gayuh Pramukti, and Mohammad Murtaza Sherzoy. "Geology and Geochemistry Analysis for Ki Index Calculation of Dompak Island Granite Bauxites to Determine the Economical Mineral." In Proceedings of the Second International Conference on the Future of ASEAN (ICoFA) 2017 – Volume 2, 947–54. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8471-3_94.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ramana, Y. V., and Rajesh C. Patnaik. "Application of Thermogravimetric Analysis for Estimation of Tri-hydrate Alumina in Central Indian Bauxites — an Alternative for Classical Techniques." In Light Metals 2011, 211–14. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48160-9_37.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ramana, Y. V., and Rajesh C. Patnaik. "Application of Thermo-gravimetric Analysis for Estimation of Tri-hydrate Alumina in Central Indian Bauxites-An Alternative for Classical Techniques." In Light Metals 2011, 211–14. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118061992.ch37.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kotinis, D. H., A. I. Sofianos, and A. P. Kapenis. "Analysis of a roof failure in a bauxite mine." In Mine Planning and Equipment Selection 1997, 347–52. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078166-60.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Daly, Blánaid, Paul Batchelor, Elizabeth Treasure, and Richard Watt. "Fluoride and fi ssure sealants." In Essential Dental Public Health. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199679379.003.0018.

Повний текст джерела

Анотація:

Fluoride has made an enormous contribution to declines in dental caries (Kidd 2005; Murray and Naylor 1996). Fissure sealants are a proven preventive agent. This chapter provides a brief overview of the history of fluoride and presents a brief synopsis of the mode of action, method of delivery, safety, and controversies in the use of fluoride. A public health perspective on fissure sealants will also be presented. An account of the history of fluoride can be found in Kidd (2005) and Murray et al. (2003) and is summarized in this section (see Box 12.1 for key dates). In 1901, Frederick McKay, a dentist in Colorado Springs, USA, noticed that many of his patients, who had spent all their lives in the area, had a distinctive stain on their teeth known locally as ‘Colorado stain’. McKay was puzzled and called in the assistance of a dental researcher G.V. Black. They found that other communities in the USA had the characteristic mottling. Their histological examination of affected teeth showed that the enamel was imperfectly calcified, but that decay in the mottled teeth was no higher than in normal teeth. McKay suspected that something in the water supply was producing the brown stain, and more evidence came from Bauxite, a community formed to house workers of a subsidiary of the Aluminium Company of America (ALCOA). A local dentist noticed that children in Bauxite had mottled teeth, whereas children in nearby Benton did not. McKay investigated the problem but was unable to find a cause for the staining when the water supply was tested. In 1933, Mr H.V. Churchill, Chief Chemist for ALCOA (anxious that aluminium would not be blamed for the mottling), analysed the water and found that the fluoride ion concentration in the water supply of the Bauxite community was abnormally high (13.7 ppm). He tested other communities affected by mottling which had been previously identified by McKay and found that they too had high levels of fluoride present in the water supplies.

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Bauxite Analysis"

Beurton, Gabriel, Bertrand Ledru, and Philippe Letourneur. "Perspectives for on-line analysis of bauxite by neutron irradiation." In 4th International Conference on Applications of Nuclear Techniques: Neutrons and their Applications, edited by George Vourvopoulos and Themis Paradellis. SPIE, 1995. http://dx.doi.org/10.1117/12.204186.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Cui, Tao. "Analysis on Characteristics of Provenance of bauxite in Guizhou, China." In 2015 International Conference on Economics, Social Science, Arts, Education and Management Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/essaeme-15.2015.161.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kusuma, Ratih Chandra, Barlian Dwinagara, Ika Tri Novianti Siregar, Dedek Prasetyo, and Oktarian W. Lusantono. "Surface water quality analysis on the bauxite mining operations in Central Kalimantan." In 3RD INTERNATIONAL CONFERENCE ON EARTH SCIENCE, MINERAL, AND ENERGY. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0061595.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Orfanos, C., K. Leontarakis, and G. Apostolopoulos. "A Litho-Constrain Approach for Gravity Data Analysis at Gerolekas Bauxite Mining Area." In 25th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902375.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Torbica, Duško, Dražana Tošić, Miodrag Čelebić, and Jovana Munjiza. "ANALYSIS OF THE UNDERGROUND ROOMS STABILITY (LATERAL DRIFTS) AND CALCULATION OF THE LOADING OF SAFETY PILLARS IN UNDERGROUND MINE "BATURINKA"." In GEO-EXPO 2022. DRUŠTVO ZA GEOTEHNIKU U BOSNI I HERCEGOVINI, 2022. http://dx.doi.org/10.35123/geo-expo_2022_9.

Повний текст джерела

Анотація:

The stability analysis was performed on the model of underground rooms of rectangular cross-section on the example of the underground mine ,,Baturinkaʻʻ. Geotechnical data of bauxite and surrounding rocks were used for the mentioned research. The analysis of stability was performed according to the Hoek-Brown criterion of rock mass failure and data processing was performed in the software program Phase2. In order to meet the set criterion of value of safety factors (Fs), when dimensioning safety pillars, used calculation of rock mass loading, in the form of panel.

Стилі APA, Harvard, Vancouver, ISO та ін.

Huda, Thorikul, Dyani Alifya, and Rossy Amal Shalih. "Validation of Al2O3 analysis by standard calibration method and evaluation of Al2O3 determine by direct reading using ICP-OES on bauxite samples." In PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0002685.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ahmed, Zamzam Mohammed, Abrar Mohammed Salem, Jose Ramon, Liu Pei Wu, and Benjamin Mowad. "First Successful Pilot Testing of Unconventional Reservoir in North Kuwait from Scratch to Productivity." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207394-ms.

Повний текст джерела

Анотація:

Abstract Jurassic's kerogen shale-carbonate reservoir in North Kuwait is categorized as a source rock exhibiting micro- to Nano Darcy permeability and is Kuwait Oil Company's focus in recent years. Although the challenges are significant (formation creep, fracturing initiation, etc.), the efforts toward producing from unconventional reservoirs and applying experience from both USA and Canada in this field are ongoing. As a step toward development, the gas field development group selected a vertical pilot well to measure the inflow of hydrocarbon from a single fracture while minimizing formation creep (flowing of particulate material and formation into the wellbore that blocks the production). This step was required prior to drilling a long horizontal lateral wells and completing it with multiple hydraulic fractures to confirm commercial production. A comprehensive design process was executed with the full integration of operator and service company competencies to achieve the three main objectives: First, characterize the kerogen rock mechanics which allows selection of the most competent kerogen beds to prevent collapse of the hole during fracturing (creep effect) by conducting scratch, unconfined stress, proppant embedment, and fluid compatibility tests. Then, prepare a suit of strength measurements on full core samples to help in fracturing design and minimize creep effect. The second objective was to design and implement a robust proppant fracturing program that avoids the kerogen concerns after selecting the most competent reservoir unit and suitable proppant type. Third, perform controlled flowback to unload the well and attempt to establish clean inflow unlike previous attempts that failed to either suitably stimulate or prevent solids production (deliver clean inflow). After analyzing the lab test results, choosing the optimal fracturing design, and preparing the vertical well for proppant hydraulic fracturing, the treatment was performed. In December 2019, the hydraulic fracturing treatment with resin-coated bauxite proppant was successfully pumped through 6 ft of perforation interval and followed by a controlled flowback. Resin-coated bauxite proppant was specifically selected to overcome the creep and embedment effects during the fracture closure and flowback. Moreover, a properly designed choke schedule was implemented to balance unloading with a delicate enough drawdown to avoid formation failure. This paper discusses in detail the lab testing, evolution of fracturing design, treatment analysis, and the robust workflow that led to successfully achieving all main objectives, paving the way for long horizontal lateral wells. This unconventional undertaking in Kuwait presents a real challenge. It is a departure from traditional methods, yet it points toward a high upside potential should the appraisal campaign be completed effectively.

Стилі APA, Harvard, Vancouver, ISO та ін.

Morgan, Theresa Ahima, and Dr Riverson Riverson Oppong. "An Assessment of Opportunities and Challenges of Natural Gas Utilization in Ghana." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/207173-ms.

Повний текст джерела

Анотація:

Abstract This study aims to contribute to industry discussion on gas utilization opportunities available to Ghana. Specifically, it will analyze Ghana's existing natural gas plans. i.e., the Gas Master Plan analyze possible opportunities and associated challenges and finally propose sources of finance for gas sector projects. In order to discover opportunities of natural gas utilization as well as challenges that come in the course of implementation, data was sourced from secondary sources as well. Benchmarking was also done using the natural gas journeys of three (3) case study countries: Nigeria, China, and the United Kingdom and a comparative analysis compared their natural gas journeys in terms of policy direction, natural gas utilization, infrastructure development and challenges encountered vis a vis the natural gas journey of Ghana. The analysis showed that various opportunities existed for natural gas utilization in the areas of industrial power generation, LNG export, CNG, Fertilizer and bauxite production. Various challenges such as lack of human and technical capacity, sector debt, regulatory issues, pricing issues, security of supply and others plagued most natural gas economies. These findings suggest that an ‘armory’ of opportunities exist for natural gas utilization in Ghana. However, the implementation of these utilization options is contingent on the development of proper policy instruments and extensive investment in infrastructure. The country should also be conscious of bottlenecks that may hinder natural gas utilization efforts.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ozer, Ozge, and M. Gurhan Yalcin. "Correlation of chemical contents of Sutlegen (Antalya) bauxites and regression analysis." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0026731.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Clark, Timothy B., and Brian Platt. "A STRATIGRAPHIC AND GEOCHEMICAL ANALYSIS OF NORTH MISSISSIPPI BAUXITES." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358924.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Bauxite Analysis"

Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

Повний текст джерела

Анотація:

The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!