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Dissertations / Theses on the topic 'Cyanide process'

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Published: 4 June 2021
Last updated: 29 July 2024

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1

Guilfoyle, Laurence Michael. "Quartz crystal microbalance analysis for cyanide and cyanide-degrading bacteria in gold process solutions." Thesis, Guilfoyle, Laurence Michael (1998) Quartz crystal microbalance analysis for cyanide and cyanide-degrading bacteria in gold process solutions. PhD thesis, Murdoch University, 1998. https://researchrepository.murdoch.edu.au/id/eprint/52707/.

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Cyanide is used by the gold mining industry to extract gold from ore. The accurate measurement of cyanide in process solutions and the removal of cyanide from wastes are two areas of significant concern for the gold mining industry. Biological cyanide destruction has been used successfully to remove cyanide from process solutions and leachate from heap leach pads. The aim of this work was to investigate cyanide degrading bacteria from gold mines in Western Australia. In order to measure the activity of cyanide degrading bacteria, a method was developed to determine cyanide in small sam
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Bicknell, C. R. "The role of rhodium in the Andrussow process." Thesis, Nottingham Trent University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389767.

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3

Dippenaar, Francois. "The interaction between free cyanide and silver impregnated activated carbon in a column configuration." Thesis, Cape Technikon, 2000. http://hdl.handle.net/20.500.11838/883.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, Cape Town, 2000<br>Due to equilibrium constraints and the relatively slow kinetics of the cyanidation of gold ores, calcium or potassium cyanide is added to the leaching stage in excess to that required theoretically. This, in many situations, result in large concentrations of free cyanide present in the effluent streams from gold plants. In view of the toxicity of cyanide and the fact that cyanide is fatal in small dosages, authorities have been forced to tigl1ten up plant discharge regulations. Therefore, it is vital to remove cyani
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4

Burnett, Hannelene Jo-Anne. "Equilibrium shift of gold adsorption in a batch reactor." Thesis, Cape Technikon, 2001. http://hdl.handle.net/20.500.11838/881.

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Thesis (MTech(Chemical engineering))--Cape Technikon, Cape Town, 2001<br>Over the years the carbon-in-pulp technology has been refined to become the highly efficient process that is used in our present-day system of recovering dissolved gold from cyanide leached pulps. The efficiency of a CIP circuit mainly depends on the effectiveness ofthe adsorption section as it not only determines the amount of soluble gold lost in the residues, but also indirectly affects the function of the other processes in the plant. Research in this area has declined over the past few years as a result of
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5

Van, Wyk Andries Pieter. "Flowsheet development and comparison for the recovery of precious metals from cyanide leach solutions." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86302.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The Platreef ore deposit, situated in the Bushveld Igneous Complex, is one of the world’s largest platinum group metal (PGM) resources. The mineralogy of this resource is, however, unique as it consists of complex PGM mineralization with mainly copper and nickel, at very low PGM grades. The PGMs are mainly present in the ore as slow floating refractory minerals resulting in marginal process economics when processing via traditional mill-float-smelt processes. A new process is currently being investigated to extract PGMs from l
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Van, den Berg Rudolf. "Inhibition of the pregrobbing phenomenon in gold ores." Thesis, Cape Technikon, 2000. http://hdl.handle.net/20.500.11838/907.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, Cape Town, 2000<br>In a typical gold-recovery plant, it is estimated that a substantial amount of the gold in residues may be in the form that is recoverable by cyanidation. The gold in residues can be ascribed broadly to (l) the presence of cyanicides, which consume the cyanide radical and thus inhibit dissolution of gold, (2) refractory gold resulting from coatings on some gold particles, (3) large gold particles incompletely dissolved due to inadequate contact time, (4) unliberated gold as a result of too coarse a milled produ
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7

Fernando, Kapila Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "The treatment of cyanidation tailings using ion exchange resin." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40697.

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This thesis explores the behaviour of metal cyanide complexes under oxidative acid conditions in ion exchange systems, with the objective of developing an ion exchange based process for the treatment of gold cyanidation tailings. The novel cyanide detoxification process developed from this study employs strong base ion exchange resins to extract cyanide from tailings. Variations in the stability of cyanide complexes are exploited to concentrate, recover, or destroy cyanide species loaded on the resin, through the use of an oxidative acid eluent containing H2O2 and H2SO4. This eluent removes al
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8

Gray, Diane Elizabeth. "A quantitative study into carbon-in-pulp adsorption operations." Thesis, Cape Technikon, 1999. http://hdl.handle.net/20.500.11838/886.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, Cape Town, 1999<br>Carbon-in-pulp (CIP) and carbon-in-leach (CIL) remain the most effective, and widely used processes for gold recovery from cyanided pulps. The extensive use of carbon in such processes have prompted many researchers to investigate the mechanism of metal cyanide adsorption. Not only has this provided many viable theories in the understanding of the mechanism, but it has also led to an improved understanding of the effects of the various operating conditions on the CIP circuit. However, the declining gold price has ma
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9

Major, Jacqueline. "A solution concentration model for CIP simulation." Thesis, Cape Technikon, 2001. http://hdl.handle.net/20.500.11838/871.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, Cape Town, 2001.<br>Carbon-in-pulp technology is used extensively in the mining industry to recover metal cyanides from solution. Also this technology has found increasing application in the gold mining sector, replacing the less efficient zinc precipitation procedure. The extensive use of carbon in such processes have prompted many researchers to investigate the mechanism of metal cyanide adsorption. Not only has this provided many viable theories in the understanding of the mechanism, but has also led to an improved understanding of
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10

Mekuto, Lukhanyo. "A mixed microbial community for the treatment of free cyanide and Thiocyanate containing wastewater." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2555.

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Thesis (DTech (Chemical Engineering))--Cape Peninsula University of Technology, 2017.<br>Industrial wastewater management pertaining to the mining industry has become increasingly stringent, with companies being required to develop environmentally benign wastewater management practices worldwide. The industries that utilise cyanide compounds for the recovery of precious and base metals in a process known as the cyanidation process, have contributed substantially to environmental deterioration and potable water reserve contamination due to the discharge of poorly treated, or untreated, cyanide
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11

Ngoie, Mpinga Cleophace. "The extraction of precious metals from an alkaline cyanided medium by granular activated carbon." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71787.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A 2 stage heap leach process to extract base and precious metals from the Platreef ore is currently being investigated industrially. A first stage bioleach is used to extract the base metals. In the 2nd stage, cyanide is used as the lixiviant at high pH to extract the platinum group metals and gold. By analogy with current gold recovery practices, the present study investigates the preferential and quantitative adsorption of precious metals (Pt, Pd, Rh and Au) over base metals (Cu, Ni and Fe) from an alkaline cyanide medium,
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12

van, Zyl Andries Wynand. "An investigation into the fundamental understanding of an activated sludge bioremediation process and optimisation of thiocyanate and cyanide destruction." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30421.

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Cyanide (CN) is used in the gold mining industry to dissolve gold from free milling, complex and refractory gold containing ores. Processing sulphide containing refractory ores using biooxidation as a pre-treatment has become increasingly important due to the depletion of free milling ores. The reaction of CN with reduced sulphur species during the cyanidation process results in the formation of thiocyanate (SCN), often at relatively high concentrations (> 5 000 mg/L). The SCN and residual free CN are deported with the tailings as components of the liquid fraction. The concentration of SCN oft
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13

Lorenzen, Leon. "A fundamental study of the dissolution of gold from refractory ores." Thesis, Stellenbosch : Stellenbosch University, 1992. http://hdl.handle.net/10019.1/69492.

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Thesis (PhD)--Stellenbosch University, 1992.<br>ENGLISH ABSTRACT: The dissolution of gold from refractory ores is a complex kinetic problem involving a number of chemical, mass transport and mineralogical factors. In most Witwatersrand ores in South Africa more than 97 % of the gold is dissolved in cyanide medium after a residence time of about 16 hours in pachuca tanks. This high percentage may be the reason why so little fundamental research has been done into the mechanism and kinetics of the leaching process. With the increasingly lower grades of ore mined, the intr
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14

Martin, W. "Recovery of impregnated gold from waste mine timber through biological degradation." Thesis, Cape Technikon, 2000. http://hdl.handle.net/20.500.11838/2156.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, 2000.<br>The large quantities of wood chips produced at mines from damaged underground timber contain gold that cannot be completely recovered by cyanidation. A fungus that can degrade a portion of the wood matrix will allow the gold that was previously locked up, to come into contact with the cyanide solution during beneficiation, thereby improving recoveries. The fungus Phanerochaete chrysosporium produces enzymes that use the organic compounds found in lignin as substrate. Consequently, the fungus is able to selectively break down
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15

Scarazzato, Tatiana. "Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/98502.

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Los dos baños de cobre más utilizados comercialmente son el baño ácido a base de sulfato y el baño alcalino a base de cianuro. Los baños alcalinos son utilizados principalmente para producir recubrimientos en piezas con geometría compleja y para evitar la deposición galvánica cuando se deposita un metal en un sustrato menos noble. Debido a la toxicidad de los compuestos de cianuro, se han desarrollado baños alternativos usando diferentes agentes complejantes. El punto de partida de la presente investigación es un baño primario sin cianuros para deposición de cobre en sustratos de Zamak desarro
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16

Scarazzato, Tatiana. "Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-12032018-145732/.

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The two most common commercial copper baths are the acid sulfate copper bath and the alkaline cyanide copper bath. Alkaline copper baths are mostly used to coat parts with complex geometry and to avoid galvanic deposition when depositing a metal on a less noble substrate. Because of the toxicity of cyanide compounds, alternative baths have been developed using different complexing agents. The starting point of the present study is a cyanide-free strike bath developed for copper plating on Zamak substrates developed by the Institute for Technological Research of the State of São Paulo/ Brazil.
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17

Göksu, Sermin Aktaş Ahmet Hakan. "Siyanisitler içeren gümüş cevherlerinin siyanür liçinde siyanisit-çözünme kinetiği ilişkisi ve gümüş çözünme veriminin artırılması /." Isparta : SDÜ Fen Bilimleri Enstitüsü, 2008. http://tez.sdu.edu.tr/Tezler/TF01135.pdf.

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18

Oswald, Florian [Verfasser], and C. [Akademischer Betreuer] Syldatk. "Upgrading the toolbox for fermentation of crude syngas: Process characterization for complete carbon usage, cyanide adaption and production of C4 components / Florian Oswald ; Betreuer: C. Syldatk." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1176022598/34.

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19

Jayasinghe, Nivari School of Chemical Engineering &amp Industrial Chemistry UNSW. "Ion exchange equilibria of the gold cyanide complex in aqueous and mixed solvent environments." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/23056.

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Ion exchange equilibria are presented for [ ]??? ??? Au(CN)2 / Cl , [ ]??? ??? Au(CN)2 / SCN and SCN??? / Cl??? in aqueous solution, and in various mixed solvents, at 303K using Purolite A500 as the ion-exchanger. The mixed solvents investigated include water-acetone, water-dimethylsulfoxide (DMSO) and water-N-methyl-2-pyrrolidone (NMP). In aqueous solution, the selectivity of Purolite A500 for a given anion increases in the order: [ ]??? ??? &lt ??? &lt Cl SCN Au(CN)2 . This selectivity sequence confirms the high affinity of the ion exchange resin for the [ ]??? Au(CN)2 species. In mixed solv
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20

Rau, Anand V. "Processing of toughened cyanate ester matrix composites." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151604/.

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21

Pandit, Mrityunjay. "Oxidation of Cyanide and phenol by ozonation process." Thesis, 1997. http://localhost:8080/xmlui/handle/12345678/3336.

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22

Fagan, Peter Andrew. "Development of an ion chromatographic system suitable for monitoring the gold cyanidation process." Thesis, 1998. https://eprints.utas.edu.au/19705/1/whole_FaganPeterAndrew1999_thesis.pdf.

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This thesis reports the development of new ion chromatographic (IC) methodology suitable for monitoring the gold cyanidation process. This project continues a series of related investigations involving the development of IC techniques, based mainly on reversed-phase ion interaction chromatography (RPIIC), for the speciation of metallo-cyanide complexes formed during the cyanidation of auriferous ores [1-4]. The focus of this earlier work was concerned with the development of suitable methodology for the analysis of the products of the cyanidation process, such as those found in tailings
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23

Monberg, Christian. "Complexes formed by zinc and cyanide ions at elevated pH." Thesis, 1990. http://hdl.handle.net/10413/5858.

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The experimental work described in this thesis is aimed primarily towards elucidation of the speciation of zinc-cyanide systems at elevated pH. In this study the formation and stability of H+-eN-, binary Zn2+-eN- and ternary Zn2+-CN--QH- complexes were studied by glass electrode potentiometry in aqueous solutions at 25.0°0 and in a medium of ionic strength of 0.1 mol dm-3. The solution pH was varied to cover the range 4 to 11. The study was undertaken with a view to establishing whether and under what conditions soluble binary zinc-cyanide complexes and ternary zinc-cyanide-hydroxide complexes
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24

Glover, Michael Richard Lister. "The modelling of the binary adsorption of gold and zinc cyanides onto a strong base anion exchange resin." Thesis, 2015. http://hdl.handle.net/10539/16881.

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25

Tshilombo, Fuamba Alain. "Influence of silver alloying and impurities on the dissolution of gold in alkaline cyanide solutions." Diss., 2000. http://hdl.handle.net/2263/30491.

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Please read the abstract in the front section of this document<br>Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2006.<br>Materials Science and Metallurgical Engineering<br>unrestricted
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26

Kao, Chih-Ming, and 高志明. "The Research of Ferric-Complexed Cyanide treated by High Temperature Hydrolysis combined with Wet Air Oxidation Process." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/13231030645725626214.

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碩士<br>國立中央大學<br>環境工程研究所<br>82<br>Ferric-Complexed Cyanide (FCC) which was resistant to destruction by conventional physichemical treatment technologies was found in various industrial wastes. The treatment feasibility study was conducted on FCC at high concentration by using different processes including High Temperature Hydrolysis (HTH), and Both processes. The experiments were operated under the following conditions: total reaction time 150 minutes, mixing rate 1300 rpm and excess air
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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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