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Dissertations / Theses on the topic 'Reductive leaching'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Sililo, Bernard Liswani. "Modelling uranium leaching kinetics." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/61336.

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The uranium price decline has negatively impacted on the uranium mining industry. This decline in price requires that uranium metallurgical processes be made to operate more efficiently. Some key parameters that influence the dissolution and kinetics of leaching uraninite (one of the main minerals from which uranium can be extracted) are pH, oxidationreduction potential and iron concentration. A good understanding of the effect these parameters have on the leach kinetics would lead to an efficient operation of metallurgical processes. The objective of this work was therefore to investiga

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2

Kirby, A. W. "The reduction of iron content in ferrochromium via the nitriding/leaching route." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377841.

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3

Keshta, Mohammed A. "Leaching from High Capacity Arsenic-Bearing Solid Residuals under Landfill Conditions." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/193650.

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Arsenic is a naturally occurring contaminant in ground water. The link between human exposure to elevated levels of arsenic and the increase in cancerous and non-cancerous diseases is well documented. Consequently, arsenic removal from drinking water has been thoroughly investigated.Lowering the maximum contaminant limit of arsenic (from 50 to 10 ppb) will burden small water utilities, who either lack the financial or technical ability to comply. Adsorption onto solid media has been one of the most attractive options for small water utilities (EPA, 2001), but this process generates huge amoun

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4

Buzin, Pedro Jorge Walburga Keglevich de. "Desenvolvimento de um processo para redução do teor de cloro no pó de aciaria elétrica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/157809.

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Na fabricação de aço pelo processo de aciaria elétrica há geração de vários tipos de resíduos, dentre estes, as poeiras de aciaria. Este resíduo possui como principais constituintes os elementos Fe, O e Zn, sendo considerado perigoso na maioria dos países. Além destes elementos, a presença do cloro provoca interferência deletéria na maioria dos processos de reciclagem ou incorporação do PAE em outros materiais. Por este motivo, o cloro representa um obstáculo à ampliação das possibilidades de destinação ou reciclagem destas poeiras. Este trabalho propõe uma nova tecnologia hidrometalúrgica par

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5

Mercadier, Julien. "Conditions de genèse des gisements d'uranium associés aux discordances protérozoïques et localisés dans les socles. Exemple du socle du bassin d'Athabasca (Saskatchewan, Canada)." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL108N/document.

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De nouveaux gisements d’uranium, entièrement inclus dans le socle du bassin d’Athabasca (Province de la Saskatchewan, Canada), ont été récemment découverts, faisant d’eux une cible d’exploration privilégiée. Leur mode de formation est encore discuté, ne facilitant pas leur découverte. Afin de mieux les comprendre, une étude multidisciplinaire a été entreprise sur trois de ces gisements : Eagle Point, Millennium et P-Patch. Les oxydes d’uranium ont des caractéristiques chimiques variables fonction des conditions de cristallisation et d’altération postérieures à leur dépôt. Les âges U-Pb obtenus

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6

Adipuri, Andrew Materials Science &amp Engineering Faculty of Science UNSW. "Chlorination of Titanium Oxycarbide and Oxycarbonitride." Publisher:University of New South Wales. Materials Science & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44405.

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The project undertook a systematic study of chlorination of titanium oxycarbide and oxycarbonitride with the aim to develop further understanding of kinetics and mechanisms of the chlorination reactions. The project studied titania, ilmenite ores, and synthetic rutile reduced by carbon in argon and nitrogen and chlorinated at different temperatures, gas flow rates and compositions. Chlorination of titanium suboxides, iron and impurities in ilmenite was also examined. Chlorination of titanium oxycarbide Ti(O,C) or oxycarbonitride Ti(O,C,N) can be implemented at 200 to 400 deg.C, while the comme

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7

Paulo, Ezio Nalin de. "Avaliação do inibidor de nitrificação fosfato de 3,4-dimetilpirazol (DMPP) em três solos com gradiente textural, absorção e uso de nitrogênio em plantas de algodão." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/64/64133/tde-17012013-140846/.

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A utilização de inibidores de nitrificação pode ser uma alternativa interessante para aumentar a eficiência do uso do fertilizante nitrogenado em diversas culturas, porém, essa alternativa vem sendo pouco estudada em condições de solo e clima do Brasil. Assim, objetivou-se com esse trabalho avaliar a eficiência do inibidor de nitrificação fosfato de 3,4-dimetilpirazol (DMPP) em três solos com gradiente textural, bem como avaliar o destino do nitrogênio (N-NO3-, N-NH4+ e 15N) no solo, a absorção e o uso do nitrogênio (N-total e 15N) nas plantas de algodão. Três experimentos foram montados e des

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8

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.

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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

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9

Lung, Felix. "The chemistry of the Olympic Dam concentrate leaching process and viability of reductive leaching." Thesis, 2003. http://hdl.handle.net/2429/15309.

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The WMC Olympic Dam currently mines ore containing chalcocite, bornite, and hematite. The ore is expected to downgrade from chalcocite/bornite to chalcopyrite in the future. The result is increased strain on the direct smelter to blister process currently in operation and a necessary change to a two-step smelter-converter process. The chemistry of the concentrate leaching process was studied with the purpose of applying a reductive leach to enrich the concentrate. Enrichment increases the Cu:S ratio and would allow the current smelting process to continue in the future. Reductive leaching w

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10

Abed, Nedam. "A fundamental study of the reductive leaching of chalcopyrite using metallic iron." Thesis, 1999. http://hdl.handle.net/2429/9173.

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A fundamental study of the reductive leaching (decomposition) of chalcopyrite was performed in both sulfate and chloride media. This was done to understand the physical chemistry of the leaching reactions and the possibility of developing a process flowsheet. The main objective of reductive leaching is to achieve the enrichment of chalcopyrite by rejection of iron and sulfur. A chalcopyrite concentrate containing around 60% chalcopyrite and analyzing around 28% copper was leached under reducing conditions using metallic iron. Various parameters were studied to understand their effect on

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11

Lin, Bo-Ying, and 林柏蔭. "Recovery of MnO2 by Reductive Leaching of Manganese from Drink Water Treatment Sludge by Sulfuric Acid." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/az9cv9.

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碩士<br>嘉南藥理大學<br>環境工程與科學系<br>103<br>Sludge leaching and recovery manganese from drinking water treatment sludge were investigated by using H2SO4 as a leachant. The effects of agitation, H2O2 concentration, H2SO4 concentration, liquid/solid mass ratio, leaching time and reaction temperature on manganese recovery were also studied. The optimal leaching conditions were determined as 0.2M H2SO4 and 0.8 M H2O2 using liquid–solid mass ratio of 16.7(mL/g) for 5 minutes at normal atmospheric temp with agitation rate 100 rpm. Under these conditions, the Mn2+ leaching efficiency can reach to 95%. In t

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12

Wu, Tsung-Hsun, and 吳宗勳. "Reduction of Lead Metal Leaching from Flyash by Microwave Digestion." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/v5r8uc.

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碩士<br>國立臺北科技大學<br>環境規劃與管理研究所<br>94<br>The TCLP result of Flyash often exceeds the regulation control standards, because of lead and cadmium, and it produces many restrictions to follow-up treatment and recycling treatment. Flyash emitted from a large-scale refuse incinerator in the north was sampled and analysed in this research. Due to the TCLP result, it was discovered that the concentration of lead exceeded the standard most frequently (up to 11 times while studying), and therefore lead was targeted mainly in this study. The TCLP result of Flyash often exceeds the regulation control standar

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13

Apua, Momboyo Clotilde. "An investigation into hydrochloric acid leaching of low grade gold-bearing material and oxidized cobalt-copper ores." Thesis, 2012. http://hdl.handle.net/10210/5008.

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M.Tech.<br>The efficiency of hydrochloric acid leaching of gold from low grade gold-bearing material has been investigated in the presence of sodium hypochlorite (NaOCl) to produce in situ chlorine gas which is an oxidizing agent able to oxidize gold metal to gold soluble forms: Au+ and Au3+. The effect of concentrations of HCl, NaOCl, and mixtures HCl + NaOCl was sought. An investigation on chlorine species was conducted to predict their stability areas. The reactions involved and their mechanisms were established. Prior to leaching, the feed was subjected to fire assay, Atomic absorption spe

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14

Sekhukhune, Lehlogonolo Mokgadi. "Acidified ferric chloride leaching behaviour of a complex Ni – Cu matte at atmospheric pressure." Thesis, 2013. http://hdl.handle.net/10210/8303.

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15

Xie, Fu-Zong, and 謝宗甫. "Dynamic Characteristic of Reduction of Lead Metal Leaching from Flyash of Incineration by Microwave Digestion." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/6agv73.

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碩士<br>國立臺北科技大學<br>環境規劃與管理研究所<br>95<br>In general TCLP concentrations of Lead and Cadmium in flyash are usually over the regulation standards. It results in many restrictions on treatment and recycling. Flyash emitted from a large-scale refuse incinerator in the north Taiwan was investigated in this study. The objective of this research is discuss the dynamic of TCLP reduction, lead metal in flyash by Microwave Digestion Treatment method. Samples of flyash were divided into four groups, dp>417µm、295µm< dp<417、74µm< dp<295µm及37µm< dp<74µm. The experiments follow-up on the conductions, 600W

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16

Hlabangana, Nkosikhona. "Investigation of the joint comminution and leaching process for a gold ore: an attainable region approach." Thesis, 2016. http://hdl.handle.net/10539/22446.

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A thesis submitted to the Faculty of Engineering and The Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy in Engineering Johannesburg 12 September 2016<br>Comminution and leaching unit processes play a major role in extracting valuable minerals from ore. Most of the research reported in the literature has focused on optimising individual unit operations rather than on integrating the whole process. This thesis develops an integrated approach to mineral processing systems and flow sheets and is intended

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17

Takeuchi, Travis L. "Metal leaching by Thiobacillus ferrooxidans strains and their ferrous iron and sulfur oxidation and ferric iron reduction activities." 1990. http://hdl.handle.net/1993/17264.

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18

Malherbe, Stephanus. "Biological sulphate reduction using lignocellulose hydrolysis by-products produced by fungal hydrolysis of Cenchrus ciliaris cv. Molopo (Buffelsgrass)." Diss., 2001. http://hdl.handle.net/2263/23726.

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19

Yu, Dawei. "Fluidized Bed Selective Oxidation and Sulfation Roasting of Nickel Sulfide Concentrate." Thesis, 2014. http://hdl.handle.net/1807/65770.

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Selective oxidation and sulfation roasting of nickel concentrate followed by leaching was investigated as a novel route for nickel production. In the oxidation roasting stage, the iron species in the nickel concentrate was preferentially oxidized to form iron oxides, leaving non-ferrous metals (Ni, Cu, Co) as sulfides. The roasted product was then sulfation roasted to convert the sulfides of the latter metals into water-soluble sulfates. The sulfates were then leached into solution for further recovery and separation from iron oxides. The oxidation of nickel concentrate was firstly studied by

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20

Καραμούτσος, Σπυρίδων-Διονύσιος. "Ανάπτυξη μεθόδου εξουδετέρωσης επικίνδυνων στερεών κατάλοιπων πετρελαϊκών μονάδων ηλεκτροπαραγωγής με ανάκτηση πολύτιμων κραματικών μετάλλων". 2004. http://nemertes.lis.upatras.gr/jspui/handle/10889/243.

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Το ηλεκτροπαραγωγικό δυναμικό της ΔΕΗ περιλαμβάνει άνω των 40 πετρελαϊκών σταθμών συνολικής ισχύος 2100MW και οι μεγαλύτεροι είναι του διασυνδεδεμένου συστήματος και λειτουργούν στο Λαύριο και το Αλιβέρι. Οι υπόλοιποι λειτουργούν στο αυτόνομο σύστημα των νησιών του Αιγαίου και Κρήτης. Κατά τους καθαρισμούς των προθερμαντών αέρος και των δεξαμενών μαζούτ των μονάδων αυτών παράγονται σήμερα άνω των 500t στερεών καταλοίπων ετησίως με αυξητική τάση. Τα κατάλοιπα αυτά χαρακτηρίζονται σύμφωνα με την Ευρωπαϊκή οδηγία ως επικίνδυνα. Σύμφωνα με τους κανονισμούς της Ε.Ε. είναι υποχρεωτική η αδρανοποίησή

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21

Larbi, Kingsley Kweku. "Synthesis of High Purity Silicon from Rice Husks." Thesis, 2010. http://hdl.handle.net/1807/24595.

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Impurity optimized silicon is needed for the advancement of terrestrial photovoltaic power generation. In this study the possibility of producing solar grade silicon from rice husks has been pursued. An integrated process flowsheet was developed and practiced that included initial leaching, reduction of Rice husk ash (RHA) and post-reduction purification of silicon. Metallothermic reduction of purified RHA with magnesium was investigated within the temperature range of 500-950 oC. The reduction product was purified by two stage acid leaching sequence. Analysis of the final silicon powder produ

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22

Chockalingam, Evvie. "Studies On Acid Production Potential Of Some Sulphide Minerals And Bioremediation Of Acid Mine Drainage." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/597.

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Acid mine drainage (AMD) is a worldwide environmental problem associated with the mining wastes, generated from active and inactive mining sites from mineral processing activities. AMD is defined as the drainage that occurs as a result of oxidation of sulphide minerals/wastes/tailings when exposed to air and water in the presence of chemolithotrophs namely the Acidithiobacillus sp. AMD is characterised by low pH and increased acidity due to elevated heavy metals and sulphate concentration. The acid production potential was carried out for sulphide minerals such as pyrite and chalcopyrite and

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23

Chockalingam, Evvie. "Studies On Acid Production Potential Of Some Sulphide Minerals And Bioremediation Of Acid Mine Drainage." Thesis, 2007. http://hdl.handle.net/2005/597.

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Acid mine drainage (AMD) is a worldwide environmental problem associated with the mining wastes, generated from active and inactive mining sites from mineral processing activities. AMD is defined as the drainage that occurs as a result of oxidation of sulphide minerals/wastes/tailings when exposed to air and water in the presence of chemolithotrophs namely the Acidithiobacillus sp. AMD is characterised by low pH and increased acidity due to elevated heavy metals and sulphate concentration. The acid production potential was carried out for sulphide minerals such as pyrite and chalcopyrite and

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24

藤澤, 敏治, 徳志木塚 та 浩行佐野. "銅スクラップリサイクルの最適プロセスフローシート". 2001. http://hdl.handle.net/2237/13101.

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