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Dissertations / Theses on the topic 'Flotation reagents'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Lascelles, Dominique. "Quantification of adsorbed flotation reagents." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80118.

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Collector interaction with mineral surfaces has long been studied. Little work has been done, however, on directly quantifying reagent adsorption, certainly under industrial process conditions. The use of a novel surface analysis technique, Headspace Analysis Gas-phase Infrared Spectroscopy (HAGIS), is suggested for quantification of adsorbed reagents in mineral processing.<br>As a first exercise, a test system of xanthate adsorption onto lead sulphide minerals was studied. A survey of possible calibration standards (pure xanthate, a synthetic lead-xanthate, galena (PbS) and a lead sulp

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2

Schimmoller, Brian Keith. "A bubble-particle interaction model for flotation combining hydrodynamic and surface forces." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040332/.

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3

Maree, Westhein Bethren. "Froth flotation of an Nkomati mineral ore using mixtures of thiol collectors." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2512.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>Nickel, a valuable base metal, is the predominant product from the Nkomati mine in South Africa. High-grade nickel mineral ores (2%) from the Massive Sulphide Body have been depleted leaving those of low grade (0.3%). The beneficiation of this ore presents a challenge to the minerals processing industry. In response, batch froth flotation tests were used to explore the effects of mixtures of potassium amyl xanthate (PAX) and IPETC (Isopropyl ethyl thionocarbamate) on the grades and recoveries of nickel. In

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4

Zhang, Kun. "Spectroelectrochemical Investigations of the Interaction of Flotation Reagents with Gold Surfaces." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366588.

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This thesis presents the results of a spectroelectrochemical investigation into the interactions of two flotation collectors (mercaptobenzothiazole (MBT) and dithiophosphate (DTP)) with gold electrode and nanorods surfaces. The relevant compounds and ligands of these two collectors were characterised and identified by Raman spectroscopy and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Gold nanorods (Au NRs) with average aspect ratio of 4.04 ± 0.08 were synthesised and reacted with MBT and DTP. Gold particle flotation was investigated using controlled potenti

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5

Vos, Cornelius Francois. "The role of long-chain trithiocarbonates in the optimisation of Impala Platinum's flotation circuit." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-10182007-103419/.

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6

Kloppers, Lourens Marthinus. "Froth flotation of a Merensky platinum bearing ore with various THIOL collectors and their mixtures." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2481.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>The Bushveld igneous complex in northern South Africa has the largest deposit of platinum group elements (PGE) in the world. In trace amounts, these are closely associated with base metal sulphides (BMS). Froth flotation is used to beneficiate these PGE ores. The process constitutes a bulk sulphide recovery. Improvement of recovery of the BMS is required to maximise the recovery of PGEs. The performance of the froth flotation process is largely dependent on the chemical additives used and these chemic

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7

Chockalingam, Evvie. "Studies On Biodegradation Of Organic Flotation Collectors Using Bacillus polymyxa." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/184.

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Numerous organic reagents of diverse structural composition are employed in the froth flotation process for the beneficiation of non-metallic and sulphide ores. Alkyl xanthates are used as collectors for sulphide ores while amines and fatty acids are used for non-metallic ore beneficiation. Although these collector reagents react preferentially with the concerned minerals in the treated ore pulp, excess and unreacted concentration of these organic collectors end up in the mill process effluents. It has been known that even small concentrations of these organic reagents in water streams are tox

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8

Chockalingam, Evvie. "Studies On Biodegradation Of Organic Flotation Collectors Using Bacillus polymyxa." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/184.

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Numerous organic reagents of diverse structural composition are employed in the froth flotation process for the beneficiation of non-metallic and sulphide ores. Alkyl xanthates are used as collectors for sulphide ores while amines and fatty acids are used for non-metallic ore beneficiation. Although these collector reagents react preferentially with the concerned minerals in the treated ore pulp, excess and unreacted concentration of these organic collectors end up in the mill process effluents. It has been known that even small concentrations of these organic reagents in water streams are tox

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9

Kracht, Gajardo Willy Andrés 1979. "Effect of frother on bubble coalescence, break-up, and initial rise velocity." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111911.

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Frothers are used in flotation to aid generation of small bubbles, but little is known about the mechanisms that take place in the flotation machine to produce such an effect. Coalescence prevention is the common explanation, although the exact mechanism is obscure and almost no attention has been paid to a frother effect on bubble break-up, the other possible mechanism. This thesis presents a technique to study the effect of frothers on bubble coalescence at the generation stage (at a capillary tube) and a technique to study the effect of frothers on bubble coalescence and break-up in a turbu

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10

Basilio, Cesar Indiongco. "Fundamental studies of thionocarbamate interactions with sulfide minerals." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54486.

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The interactions of O-isopropyl-N-ethylthionocarbamate (IPETC) and O-isobutyl-N-ethoxycarbonylthionocarbamate (IBECTC) with Cu₂S, CuFeS₂ and FeS₂ have been characterized using thermodynamic calculations, electrochemistry, microflotation tests, contact angle measurements, FTIR, and UV spectroscopy. Pearson’s theory of hard and soft acids and bases (HSAB) has also been applied to these flotation systems, through the use of Drago’s acid-base concept and flow microcalorimetry. The results of the thermodynamic calculations and electrochemical measurements suggest that IPETC and IBECTC adsorption o

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11

Ramberg, J. (Juhani). "Effect of the reagents and minerals on froth electrical conductivity in pilot scale froth flotation process." Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201601131001.

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This thesis studies how the changes to the flotation process caused by adjusting pH and the dosage of the flotation reagents affect the electrical conductivity of the froth flotation froth in different parts of the froth. The measurements in the experimental part were done in Oulu Mining School’s continuous minipilot beneficiation plant at the University of Oulu in March and May of 2015. The conductivity of the froth was measured with Outotec’s ERT (Electrical Resistance Tomography) based test probe. The probe was placed inside the 4-litre flotation cell that acted as a rougher in copper refin

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12

Raso, Edson Fernandes. "Estudo de desempenho de codepressores na flotação catiônica reversa de minério de ferro." CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2014. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=334.

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Nenhuma<br>Este trabalho é um estudo de desempenho de três tipos de codepressores (TALON 6515, GPR-855 e GPR-860) associados ao amido de milho. Estes codepressores são polímeros poliamina-poliamida, com alta afinidade aos átomos de ferro e também ao amido de milho. A amostra de minério de ferro foi fornecida por uma mineradora do Quadrilátero Ferrífero de Minas Gerais. A difração de raios X mostrou que o minério é constituído basicamente por hematita e quartzo como o principal contaminante; a fluorescência dos raios X mostrou teor de ferro e sílica de 58,1% e 12,0% respectivamente. Para o estu

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13

Karlkvist, Tommy. "Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches." Doctoral thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63132.

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14

Morris, Joshua Powell. "Residual Diesel Range Organics and Selected Frothers in Process Waters from Fine Coal Flotation." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23174.

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The purpose of this thesis is to examine some of the potential fates of processing reagents in a coal preparation plant. The focus is specifically on petro-diesel (termed "diesel" in this paper), which is used as a collector in the flotation of fine coal. Diesel range organics (DRO) and polyaromatic hydrocarbons (PAHs) are measured in aqueous samples using gas chromatography equipped with either a flame ionization detector (GC-FID) or a mass spectrometer (GC-MS). Samples are subjected to a variety of test conditions in order to understand the behavior of diesel compounds in coal processing

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15

Moimane, Tiisetso Makheane. "Investigation of the effect of the reagent suite in froth flotation of a Merensky ore." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20088.

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The mining industry is faced with a challenge to develop efficient and economically feasible processing routes owing to the depletion of high-grade ores, and the ever increasing demand for precious metals for a wide range of applications. The valuable minerals, PGMs (Platinum Group Minerals) and BMS (Base Metal Sulphides) in the ores are extracted through the aid of chemical reagents (activators, collectors, depressants, frothers, modifiers) which are added to the flotation circuits to facilitate the separation between these minerals and the undesired gangue minerals present in the ore. The pr

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16

Castro, Amilton Feliciano de. "Análise do sistema de reagentes na flotação de finos de carvão mineral de moazite, Moçambique." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/150515.

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Este estudo foi feito a partir de uma amostra de carvão extraído na mina da Vale- Moçambique, localizada no distrito de Moatize, Província de Tete. O trabalho visa analisar o sistema de reagentes na flotação de finos de carvão mineral pertencente à camada UCB. Dentre os métodos de beneficiamento de carvão, a flotação se destaca como um dos mais importantes para a concentração deste material, em particular no tratamento de partículas finas. A alimentação total da planta de processamento da Vale- Moçambique é de 8000 tph de carvão, onde 10% dessa alimentação corresponde a fração fina que aliment

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17

Manono, Malibongwe Shadrach. "Investigating electrolyte-reagent-mineral interactions in response to water quality challenges in the flotation of a PGM ore." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30414.

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Froth flotation is a physicochemical process that enables the separation of valuable minerals and unwanted gangue minerals contained in an ore. It utilises the differences in surface properties of the minerals to be separated. Among other factors affecting flotation, water is a major factor as it acts as a reagent and transport medium. Therefore, it stands to reason that the quality of the water used in the process matters. Current environmental restrictions on water usage which are aimed at addressing the global scarcity of water require that mining operations recycle and reuse water within t

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18

Julio, Marcelo De. "Efeito da massa molecular das substâncias húmicas na eficiência da coagulação com o reagente de Fenton, floculação e flotação de águas de mesma cor verdadeira." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-10102016-151804/.

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A presença de substâncias húmicas em águas destinadas ao abastecimento tem ocasionado diversos problemas, entre eles a formação de subprodutos halogenados, principalmente quando se emprega a pré-oxidação com cloro. Com o reagente de Fenton não há a possibilidade de formação desses indesejáveis compostos halogenados, pois o forte poder oxidativo do reagente de Fenton é devido ao radical hidroxila (OH). Aliado a isto, com o mesmo produto químico se pode ter a pré-oxidação e coagulação de compostos orgânicos, pois o reagente de Fenton consiste na aplicação de íons de Fe+2 e peróxido de hidrogênio

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19

Leclerc, Olivier. "Etude analytique de l'action des dithiocarbonates sur la pyrite : application a la flottation." Paris 6, 1987. http://www.theses.fr/1987PA066474.

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20

Lakhrissi, Brahim. "Synthèse et étude analytique de collecteurs adaptés à la flottation ionique du gallium en milieu fortement alcalin." Nancy 1, 1988. http://www.theses.fr/1988NAN10283.

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Récupération du gallium par la technique de flottation à partir de solutions alcalines résultant de l'attaque de la bauxite par la soude dans la métallurgie de l'aluminium. Dans une première partie, synthèse d'une vingtaine d'agents complexants de la famille oxine. La deuxième partie est consacrée à la précipitation du gallium par la diisobutylamine méthyl-7 hydroxy-8 quinoléine

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21

Sekgarametso, Katlego. "Flotation of non-sulphide PGM ores - Optimization of flotation reagent suite and conditions." Thesis, 2018. https://hdl.handle.net/10539/27276.

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A dissertation submitted to the faculty of Engineering and the Built Environment, University of Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering November 2018<br>The aim of this study is to improve the flotation of non-sulphide PGM ores from the Mimosa Mine in the Great Dyke of Zimbabwe by evaluating a variety of collector reagents that have not been tested on such material before and applying a full factorial experimental design to investigate the effects of the main primary collector, co-collector and depressant on PGM recov

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22

Perucca, Carlos Francisco. "Testing and evaluation of modifying reagents in potash flotation." Thesis, 2000. http://hdl.handle.net/2429/11453.

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Potash is the main source of Potassium which is one of the three basic plant nutrients along with nitrogen and phosphorus. Between 60 to 80% of the potash ore is processed by flotation, the other two important unit operations are hot or cold crystallization and electrostatic separation. Almost all the published literature on potash flotation refers to the insoluble minerals as "collector robbers" and increased collector usage is mentioned as the consequence of the presence of slimes in potash flotation circuits. The real effect of the presence of slimes in potash flotation is far more c

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23

Chen, Ze Huai. "The synthesis of naphthalene derivatives and their adsorption at the grahite-water interface." 1994. http://arrow.unisa.edu.au:8081/1959.8/83889.

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24

Mwapwele, Collins William. "Effect of flotation reagents on the adsorption of gold by activated carbon." Thesis, 2016. http://hdl.handle.net/10539/20058.

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The use of activated carbon in gold extraction is one of the most established methods for the recovery of gold from a leach solution. This is due to its lower operational cost and its ability to produce gold bullion with good purity compared to other methods such as cementation. Flotation of sulphide gold ores is commonly used as one of the beneficiation processes before leaching. However, the type and dosage of flotation reagents can affect downstream processes due to their fouling effect on granular activated carbon. This study aims to investigate the fouling effect of the most widely used f

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25

Ye, Xiangfei. "Optimising regrinding chemistry." 2010. http://arrow.unisa.edu.au:8081/1959.8/97517.

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The chemistry during regrinding is critical to flotation. It has significant effects on mineral surface properties and can lead to different mineral floatabilities. This research seeks to quantify contributing factors to changes in mineral flotation behavior with grinding and regrinding. The influence of the particle breakage mechanism on mineral floatability is also investigated. In this research, sulphide mineral surface species and hydrophobicity were analyzed by a range of techniques, including X-ray photoelectron spectroscopy (XPS), surface area measurement (BET), ethylene diamine-tetra a

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26

Van, der Linde Gert Johannes. "Studie van die wisselwerking tussen reagense en minerale by die flottasie van apatiet." Thesis, 2015. http://hdl.handle.net/10210/14804.

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D.Sc. (Chemistry)<br>The Phosphate Development Corporation (FOSKOR) recovers apatite from foscorite ore by a process of froth flotation. Four reagents are used viz. sodium hydroxide, water-glass, nonylphenol tetraglycol ether (EMU) and a fatty acid. The fatty acid is mainly composed of a mixture of oleic and linoleic acid in a ratio of 1,2:1. The aim of this study was to investigate the influence of the first three above-mentioned reagents on the adsorption of oleic, linoleic and linolenic acids on apatite and The Phosphate Development Corporation (FOSKOR) recovers apatite from foscorite ore b

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27

Kuys, KJ. "In situ investigations of the adsorption of flotation collectors on cassiterite by FTIR-ATR spectroscopy." Thesis, 1986. https://eprints.utas.edu.au/20204/7/whole_KuysKelvinJ1987.pdf.

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28

Vos, Cornelius Francois. "The role of long-chain trithiocarbonates in the optimisation of Impala Platinum's flotation circuit." Diss., 2007. http://hdl.handle.net/2263/28821.

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Trithiocarbonates (TTCs) with less than six carbon atoms per molecule historically have proved to be better bulk sulphide mineral collectors than conventional dithiocarbonates (DTCs). However, high vapor pressures of the short-chain mercaptan decomposition products prevented them from general industrial use. Impala’s commitment in TTC development changed in 2002 when the nC12-trithiocarbonate indicated strong synergism when added to their existing flotation suite. A concerted research effort at the University of Utah followed, and in particular on their surface chemistry. To compliment current

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29

Mabotha, Eric Tswaledi. "Mixed integer nonlinear optimization framework applied to a platinum group metals flotation circuit." Diss., 2020. http://hdl.handle.net/10500/27253.

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This study described an alternative approach for flotation circuit optimization using a mathematical programming technique. Mathematical formulation resulted in mixed integer nonlinear programming problem. Experimental method was used to determine operating conditions of flotation circuit such as flotation circuit stream grades. These conditions were used as the basis for solving optimization problem formulated. The results of the optimization problem were obtaining by setting up the problem in MATLAB optimization toolbox. Performance of flotation circuit in terms of recovery with respect to o

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30

Kahn, Riyard. "Optimisation of reagent addition during flotation of a nickel sulphide ore at the Nkomati Mine concentrator." Thesis, 2017. http://hdl.handle.net/10539/22965.

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A dissertation submitted to the faculty of Engineering and the Built Environment, University of Witwatersrand in fulfilment of the requirements for the degree of Master of Science in Engineering 28 January 2017<br>Batch scale laboratory testwork was conducted to evaluate collector and depressant addition on flotation performance of a nickel sulphide ore. The objectives of the study were to: 1. develop an understanding of the effects of collector and depressant dosage, and its interactive effects, on flotation performance and 2. determine the effect of stage dosing collector and depressant o

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