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Tesi sul tema "Slags"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Bronsch, Arne. "Viscosity of slags." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-229196.

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Slags plays a significant role at high temperature processes. The estimation of the slag viscosity is vital for the safe run of e.g. entrained flow gasifiers. One opportunity of determination is rotational viscometry. This technique is disadvantageous in view of elevated temperatures, applied materials and the necessary time. Additionally, the viscosity can be predicted by the help of viscosity models, where viscosity is a function of slag composition and temperature. Due to changing slag properties within the technical processes, the calculated viscosities can hugely differ from measured ones

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2

Muhmood, Luckman. "Investigations of thermophysical properties of slags with focus on slag-metal interface." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26611.

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The objective of this research work was to develop a methodology for experimentally estimating the interfacial properties at slag-metal interfaces. From previous experiments carried out in the division, it was decided to use surface active elements like sulfur or oxygen to trace any motion at the interface. For this purpose the following experimental investigations were carried out. Firstly the density of slag was estimated using the Archimedes Principle and the Sessile Drop technique. The density of the slag would give the molten slag height required for the surface active element to travel b

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3

Larsson, Jesper. "Acid neutralization using steel slags : Adsorption of fluorides in solutions using AOD slags." Thesis, KTH, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171235.

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Surface treatment processes of stainless steel, such as pickling, produces acidic waste water consisting of Na⁺, Cl⁻, F⁻, NO⁻3, SO42-, PO43-, Fe3+, Cr6+ and Ni2+. At Sandvik ABs steel works in Sandviken, this waste water is treated and neutralized using slaked lime before being released into the lake Storsjön. The aim of this report was to make a literary review of previous work in using slag as a neutralizing agent for acidic waste water. Furthermore, to see if it’s possible to replace some or all of the slaked lime in the neutralization process with slag and to study what slag that might be

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4

Ekengård, Johan. "Aspects on slag/metal equilibrium calculations and metal droplet characteristics in ladle slags." Licentiate thesis, KTH, Materials Science and Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1788.

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<p>In the present work the mixing between the metal and slagphase during the ladle refining process from tapping from theelectric arc furnace to casting in two different Swedish steelplants has been studied.</p><p>Three slag models and the sulphur-oxygen equilibrium betweenslag and steel was used together with the dilute solution modelfor the liquid steel phase to predict the equilibrium oxygenactivity in steel bulk and metal droplets in top slag inequilibrium with the top slag. The predicted oxygen activitieswere compared with measured oxygen activities from the steelbulk. The results show si

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5

Johnston, Murray. "Thermodynamics of selenium and tellurium in molten metallurgical slags and alloys." University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0064.

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There are a number of impurity elements present in sulphide ores that can have a deleterious effect on the properties of the final copper metal product. In this thesis, an equilibrium distribution technique was used to determine the thermodynamic behaviour of selenium and tellurium in molten slags used in copper production. Calcium ferrite based slags and copper or silver alloy were equilibrated in magnesia crucibles at temperatures of 1200 to 1400 °C and oxygen partial pressures of 10-11 to 10-0.68 atm. Under conditions typical of those employed during copper converting, the minor elements we

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6

Coetzee, Colette. "Solidification behaviour of titania slags." Diss., Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-02282007-152308.

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7

Nzotta, Mselly M. "Sulphide capacities of multicomponent slags /." Stockholm : Tekniska högsk, 1999. http://www.lib.kth.se/abs99/nzot0219.pdf.

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8

Jelkina, Albertsson Galina. "Investigations of Stabilization of Cr in Spinel Phase in Chromium-Containing Slags." Licentiate thesis, KTH, Materialens processvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50709.

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The influence of basicity, heat treatment as well as different oxygen partial pressures on the phase relationships in the CaO-MgO-SiO2-Cr2O3 slags was studied with a view to control the precipitation of Cr-spinel in the slag phase. The equilibrium phases in CaO-MgO-SiO2-Cr2O3 slag system in the range on 1673-1873 K have been investigated under low oxygen partial pressure as well as in as air atmosphere. In low oxygen partial pressure experiments, a suitable mixture of CO and CO2 was used to control the oxygen partial pressure. The oxygen partial pressure was kept at 10-4 Pa. The Cr2O3 and MgO

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9

McDonnell, John G. "The classification of early ironworking slags." Thesis, Aston University, 1986. http://publications.aston.ac.uk/11864/.

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10

Bessinger, Deon. "Cooling characteristics of high titania slags." Diss., Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-07212006-102324/.

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11

Lu, Jun. "Petroleum coke slags : characterization and dissolution /." Diss., This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-10022007-144734/.

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12

Ji, Fuzhong. "Studies on viscosities of some multicomponent slags /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs99/ji0128.pdf.

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13

Shankar, Amitabh. "Studies on High Alumina Blast Furnace Slags." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4431.

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14

Turgeon, Jean-François. "Digestion of titaniferous slags with sulphuric acid." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56951.

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Abstract (sommario):

Digestion of titaniferous slag (Sorelslag) with sulphuric acid was studied in an effort to optimise the process and develop a better understanding of its chemistry.<br>Thermodynamic analysis of the digestion reaction was performed using the program F*A*C*T. A laboratory reactor was built to simulate the operation of an industrial slag digestion reactor. Microstructure examinations of digestion samples revealed the main phases present.<br>Statistically designed experiments using the Box-Behnken technique were performed in the laboratory to correlate the responses (digestion yield, maximum tempe

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15

Groves, S. J. "Microstructure and properties of pulverised fuel slags." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38024.

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16

Freeman, Gregory Edward. "Low Temperature Calorimetry and Alkali-Activated Slags." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/1181.

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The American Society of Civil Engineers’ (ASCE’s) “2013 Report Card for America’s Infrastructure” estimated that “32% of America’s major roads are in poor or mediocre condition.” An estimated $100 billion dollars are needed to maintain that condition, and an additional $79 billion is needed to improve the quality of American roadways to an acceptable level. In many regions around the US, the service lives of concrete pavements are limited by the damage caused by freezing and thawing of pore solution inside the pavements. Alkali-activated slags (AAS) are produced from ground granulated blast fu

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17

Hundermark, Rodney. "The electrical conductivity of melter type slags." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5316.

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Bibliography: p. 219-226.<br>This thesis details an investigation into the factors affecting the electrical conductivity of slags containing some or all of the following components: Ah03, cae, Cr203, FeOx, MgO and Si02. The interest in the electrical properties of these slags originated from problems being experienced in the electrical control of the melter type furnaces of the platinum producers in South Africa. A large amount of literature on the electrical conductivity of slags was collected and analysed. The key research areas identified through the literature review were: the effect of ir

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18

Diener, Silvia. "Ageing behaviour of steel slags in landfill liners." Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26542.

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Steel slags are by-products of the steelmaking process. To avoid unnecessary disposal, e.g. into landfill, their chemical and physical properties should be exploited to support alternative uses. Steel slags can be recycled within the steel plant or used as construction material in roads, hydraulic engineering and different types of barriers, including landfill covers. A landfill cover consists of several layers, including a liner with low water and gas permeability in order to reduce methane and leachate emissions. Several studies have demonstrated that steel slags have good potential to fulfi

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19

Groen, John Corwyn. "Microchemical phase characterization of petroleum coke gasification slags." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38625.

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The inorganic chemistries of coal and petroleum differ because of their disparate geologic environments of formation, the physical state of the fuels, and the type and quantity of minerals and organic compounds in the fuels. Commercial coals typically contain 2 to 25% ash (average ~ 10%) while petroleums contain 0.003 to 0.07% ash (average ~ 0.01 %). Globally averaged, coal ash is dominated by Si, Fe, Ca, AI, and S, whereas petroleum ash contains significant quantities of V, Ni, S, Fe, Ca, Na, K, Mg, Si and AI. This larger number of important elements causes petroleum combustion slags to have

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20

Goso, Xolisa Camagu. "Phase equilibria studies and beneficiation of titaniferous slags." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31422.

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Titaniferous magnetite (titanomagnetite) offers a unique opportunity for the production of three valuable products from one resource. It generally contains economically appreciable reserves of vanadium and iron as well as significant contents of titanium. Titanomagnetite is typically smelted in blast or electric furnaces in the presence of reductant and fluxes (dolomite and quartz) to produce a valuable vanadium bearing pig iron and a virtually valueless titaniferous slag. The titaniferous slag by-products are generally defined by the Ca-Mg-Al-Si-Ti-O system. These fluxed slags can contain as

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21

Chen, Shengqi. "Phase equilibria in MgO-containing ferro-nickel smelting slags /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18402.pdf.

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22

Wain, Susan Elizabeth. "Thermal and mechanical properties of pulverised fuel boiler slags." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8209.

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23

Ionescu, Denisa V. "The hydraulic potential of high iron bearing steel slags." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/NQ46358.pdf.

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24

Persson, Mikael. "Densities and viscosities of slags : modeling and experimental investigations." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3926.

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25

Adolfsson, Daniel. "Steelmaking slags as raw material for sulphoaluminate belite cement /." Luleå : Luleå tekniska universitet/Tillämpad kemi och geovetenskap/Processmetallurgi, 2006. http://epubl.ltu.se/1402-1757/2006/72/LTU-LIC-0672-SE.pdf.

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26

Burn, G. C. "Gas injection phenomena in high viscosity liquids and slags." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328129.

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27

Nilsson, Jonas. "Reggio Emilia-filosofi i skolan - ett slags diskursivt dilemma." Thesis, Umeå universitet, Institutionen för estetiska ämnen i lärarutbildningen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-129630.

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Avsikten med denna studie har varit att undersöka pedagogers samtal och utsagor kringestetiska arbetsformer och ämnesöverskridande arbetsområden i relation till utformandet av en”öppen ateljé” på skolan. Frågorna jag ställde mig var; Hur legitimerar pedagoger behovet aven ”öppen ateljé” på skolan? Vilka samband ser pedagoger mellan lärmiljöers utformning ochvilka läraktiviteter som kommer till uttryck? Vilka tolkningsrepertoarer om lärande ochlärmiljöer kommer till uttryck i dessa sammanhang och hur kan de förstås ur ett makt- ochkontrollperspektiv? Jag valde en kvalitativ metod med en diskurs

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28

Stjernberg, Jesper. "Degradation of mullite based materials by alkali containing slags." Licentiate thesis, Luleå : Division of Engineering Materials, Luleå University of Technology, 2008. http://epubl.luth.se/1402-1757/2008/41.

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29

Seshadri, Prashant. "Treatment of acid mine drainage with Weirton steel slags." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1730.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains vii, 38 p. : ill. Includes abstract. Includes bibliographical references (p. 29-30).

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30

Bartie, Neill J. "The effects of temperature, slag chemistry and oxygen partial pressure on the behaviour of chromium oxide in melter slags." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16255.

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Thesis (MScIng)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: This thesis details results obtained in an experimental study conducted to determine the effects of operating temperature, oxygen partial pressure, bulk chromium oxide content and bulk FeOx/MgO ratio on the solubility of chromium oxide in melter type slags in the platinum industry. Two PGM-containing layers in the Bushveld Complex in South Africa, the Merensky and UG2 reefs, are currently being mined for the extraction of base metals and platinum group metals (PGM). While the Merensky reef is a pyroxenitic layer, the

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31

Yang, Yang. "Equilibrium phase relationships in the CaO-MgO-SiO2-Cr2O3 slags." Thesis, KTH, Materialens processvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-88923.

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32

Monaghan, Brian Joseph. "The kinetics of liquid iron dephosphorization using lime based slags." Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.626859.

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33

Bridges, P. A. "Foam and bubble column phenomena in viscous liquids and slags." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315560.

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34

Borode, J. O. "Dephosphorization of molten pig iron at 1400deg.C using soda slags." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372115.

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35

VAZ, GUILHERME DEMBERG. "QUANTIFICATION OF METALLIC IRON LOSSES IN ELECTRIC ARC FURNACE SLAGS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18624@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>A metalurgia é a ciência que estuda os diversos meios para a transformação dos metais em materiais úteis à sociedade. A metalurgia do ferro representa a maior fatia da aplicação dos metais. Por ser tão representativa é chamada de Siderurgia. Dentre as diversas rotas para a transformação do ferro em aço, as usinas semi-integradas apresentam um forte apelo ecológico, pois utilizam a sucata, oriunda da reciclagem de ferro, e o ferro gusa como matérias-primas para a fusão no Forno Elétrico a Arco. Naturalmente, em todo processo industrial há a

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36

Potysz, Anna. "Copper metallurgical slags : mineralogy, bio/weathering processes and metal bioleaching." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1201/document.

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Les principaux objectifs étaient d'évaluer la stabilité de l'environnement des scories métallurgiques de Cu résultant de différentes périodes d'activités industrielles et de différentes technologies de fusion. Parmi les scories étudiées, on retrouve: les scories historiques cristallines (SH) ainsi que modernes: les scories de four vertical (SFS), les scories granulées (GS) et les scories de plomb (LS). Les différentes approches adoptées dans ce travail de thèse ont tenu compte de: i) la composition chimique et la phase minérale des scories, ii) la sensibilité à la lixiviation des scories sous

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37

Schlesinger, Mark E. "LEAD OXIDE SOLUBILITY IN LEAD BLAST-FURNACE SLAGS (ACTIVITY, THERMODYNAMICS)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/291261.

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38

Mostafaee, Saman. "A Study of EAF Austenitic and Duplex Stainless Steelmaking Slags Characteristics." Licentiate thesis, KTH, Materials Science and Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12064.

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<p>The high temperature microstructure of the solid phases within the electric arc furnace (EAF) slag has a large effect on the process features such as foamability of the slag, chromium recovery, consumption of the ferroalloys and the wear rate of the refractory. The knowledge of the microstructural and compositional evolution of the slag phases during the EAF process stages is necessary for a good slag praxis.</p><p>In <strong>supplement 1</strong>, an investigation of the typical characteristics of EAF slags in the production of the AISI 304L stainless steel was carried out. In addition, co

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39

Engström, Fredrik. "Mineralogical influence on leaching behaviour of steelmaking slags : a laboratory investigation." Doctoral thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26653.

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The Swedish steelmaking industry produces large amounts of by-products. In 2008, the total amount of slag produced reached approximately 1,300,000 metric tons, of which 20% was deposited. Due to its strength, durability and chemistry, steel slag is of interest in the field of construction, since it has similar or better qualities than ordinary ballast stone, which makes it a competitive construction material. However, some steel slags face an array of quality concerns that might hinder their use. These concerns generally involve the following physical and chemical properties:Volume expansion D

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40

Timoshkin, Igor. "Electrical disintegration of ores and slags and liberation of valuable inclusions." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/8626.

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41

Donald, Jeffrey Richard. "Surface interactions between non-ferrous metallurgical slags and various refractory materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27913.pdf.

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42

Brandberg, Jenny. "Solubility of hydrogen in slags and its impact on ladle refining." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4143.

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43

Tianming, Sun. "Extraction of Mn and Cr from slags by molten salt electrolysis." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116610.

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There are many kinds of elements, especially heavy metallic elements, presentin the industrial slags. These elements bring big environmental problems ifthey are directly used in land filling. And the recovery of these elements canalso have benefits for the resource conservation. This paper reports the use ofelectrochemical method to extract the metal elements from both industrial slagand pure oxide. The mixture of NaCl-KCl was used as the electrolyte for thisprocess. Some proposals are alsomentioned for the further work.

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44

Bilen, Idil. "Direct Reduced Iron Production from EAF Slags in Fixed Bed Furnace." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117981.

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Electric arc furnace (EAF) slags are basic characteristic slags that include approximately 40 % iron oxide compounds. Iron oxide can be recycled and re-used in the process to decrease amount of waste product besides reducing loss of raw materials. According to result of survey performed by The European Association Representing Metallurgical Slag Producers and Processors (EUROSLAG) in 2010, 8.5 million tons of EAF slag is produced in Europe. High percentage of EAF slag is re-used in road construction as aggregate. However it can be re-cycled in the internal use for metallurgical processes as we

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45

Hurtig, Jenny. "Solubility of hydrogen in slags and its impact on ladle refining." Doctoral thesis, KTH, Mikro-modellering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172462.

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In the present thesis a study of the mechanisms of hydrogen control pickup during ladle treatment was undertaken. Previous studies showed that the presence of hydroxyl ions in the ladle slag resulteds in hydrogen transfer from the slag back into the steel bath. The main focus of the present work was therefore to gain deeper knowledge of the ladle slag, its properties and impact on hydrogen concentration in the liquid steel. For this purpose a number of slag compositions were examined in order to clarify whether these slags were single liquids at 1858 K. 14 out of 27 compositions in the Al2O3-C

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46

Barnes, J. S. "Gas injection into viscous liquids and slags by submerged vertical lance." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315593.

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47

Kalcioglu, Ali Ferdi 1960. "Distribution of antimony between carbon-saturated iron and blast furnace slags." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277129.

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Understanding the effects of the process parameters on the distribution behaviour of antimony between metal and slag in the iron blast furnace is critical to develop a universal method of controlling temper embrittlement in commercially pure low alloy steels.

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48

Mai, Paolo. "Effect of iron redox state on crystallization behaviour of Fayalite slags." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286327.

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In the copper smelting processes, the viscosity of the matte and the slag is an important factor for establishing efficiency. Impurities in the concentrates affect the viscosity not only by changing the melt structure but also by promoting precipitation of solid phase which sharply rises it. In this master thesis, a comprehensive methodology was established to study the MgO effects on the properties of a copper smelting slag. Thus, glassy samples were obtained and after confirmation of the composition and the glassy structure with EDS, SEM, and XRD analysis, they were examined through Ramanspe

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49

Okafor, Edwin Eme. "Early iron smelting in Nsukka-Nigeria : information from slags and residues." Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.700957.

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Liu, Xuliang. "The solubility of cobalt in iron silicate slags at 1573 K." Thesis, Liu, Xuliang (1992) The solubility of cobalt in iron silicate slags at 1573 K. PhD thesis, Murdoch University, 1992. https://researchrepository.murdoch.edu.au/id/eprint/52726/.

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Abstract (sommario):

The solubility of cobalt in non-ferrous smelting slags has been studied at 1573 K. The study involved both sulfur-free and sulfur-containing systems. In the sulfur-free systems, the solubility of cobalt in slag was examined by equilibrating iron silicate slag with liquid Co-Au-Fe or solid Co-Fe alloys under an oxygen pressure of either 10^-9 or 10^-10 atmospheres as controlled by mixture of CO/CO2 gas. Three series of experiments were carried out to evaluate the respective effects of cobalt content, iron/silica ratio and oxide additives on the solubility of cobalt in slags. The melts were

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