· Thiosulfate leaching-resin adsorption recovery, an environmentally friendly process, has been developed to efficiently extract gold from an oxide gold concentrate. 80.5% of gold extraction could be achieved by thiosulfate leaching under the conditions of (NH 4) 2 S 2 O 3 0.2 mol/L, CuSO 4 0.025 mol/L, NH 3 1.5 mol/L and leaching time 8 h,
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· The present work demonstrates that sodium sulphide solution as an alternative eluant can effect complete elution in about 4 hours at ambient temperatures. Elution efficiencies of around 100 per
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· Hydrometallurgical gold recovery processes play a pivotal role in the gold mining industry, contributing to more than 90% of global gold production. Among the array of techniques available, the Merrill–Crowe process, adsorption, ion exchange, and solvent extraction are central in extracting gold from leach solutions. While the Merrill–Crowe
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· The stripping of gold from loaded carbon here involves two basic steps; Acid Washing and Elution. The elution step may be further divided into two major stages; carbon preheat and elution proper. Here
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· Gold loaded AC was contacted with a strong base followed by elution with an aqueous solution containing an organic solvent to investigate an improved process for recovering gold from activated
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The desorption of gold from activated carbon is promoted by adding organic solvents to aqueous cyanide solutions. At 65–80°C the elution of gold is fast and is not affected by
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· Solvent elution of gold from C.I.P. carbon Article May 1985 HYDROMETALLURGY D.M. Muir W.D. Hinchliffe N. Tsuchida M. Ruane The effectiveness of the solvents in promoting gold desorption from
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Because the mechanism of elution after pretreatment entails the shifting of a physical rather than a chemical equilibrium, the higher the gold loading on the activated carbon, the more efficient is the elution procedure. When compared with other elution procedures, the proposed method appears to have several economic advantages.
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DOI: 10.1016/0304-386X(85)90005-2 Corpus ID: 94105322 Solvent elution of gold from C.I.P. carbon @article{Muir1985SolventEO, title={Solvent elution of gold from C.I.P. carbon}, author={David M. Muir and W. Peter Downington Hinchliffe
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· A new elution process for recovering gold thiosulfate from resins is described, and is based on the concept of synergistic ion exchange. In the presence of sulfite, Au(S2O3)23− is
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· Semantic Scholar extracted view of "Selective elution of the gold cyanide complex from anion exchange resin using mixed solvents" by R. Rajasingam et al. DOI: 10.1016/J.MINENG.2005.09.054 Corpus ID: 96050724 Selective elution of the gold cyanide complex
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In 1950, Zadra9, in a pilot-plant study, demonstrated the technical and commercial viability of sodium sulphide solutions for the elution of gold at ambient temperatures. He showed
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SYNOPSIS. and Analyst. Some of the parameters affecting the elution of gold from freshly loaded activated carbon using pure water as an eluant were studied. The procedure involved pretreatment of the gold-loaded activated carbon with a strong reagent of sodium cyanide and sodium hydroxide, followed by elution of the gold with water.
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· Activated carbon loaded with gold is then eluted and gold is subsequently recovered by electrochemical methods. Conventional elution processes such as atmospheric and pressurized Zadra processes, involve stripping with a cyanide (0.1–0.2% NaCN) and sodium hydroxide solution (1–2% NaOH) at high temperature (90–140°C)
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· Burstall et al. (1953) first demonstrated the elution of the gold cyanide complex from anion exchange resin with mixed solvents containing simple alcohols or acetone and 5–10% HCl. Law et al. (1985) later reported the use of a number of dipolar aprotic solvents, including acetone, dimethylsulfoxide (DMSO) and N -methyl-2
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The desorption of gold from activated carbon is promoted by adding organic solvents to aqueous cyanide solutions. At 65-80 the elution of gold is fast and is not affected by water quality. The Micron Procedure involves pretreatment of the loaded carbon with NaCN/NaOH followed by elution with methanol vapour and condensate. Carbon is packed into a
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: D.M. Muir, W. Hinchliffe, N. Tsuchida, M. Ruane · The adsorption of gold complexes onto the activated carbon is the basis of modern techniques for gold recovery. The next step is the recovery of adsorbed gold
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This review is devoted to an integrated evaluation of the current use and future development of the resin adsorption technique in gold recovery from pregnant thiosulfate solutions. Comparisons are firstly made with other recovery techniques, including precipitation, activated carbon adsorption, solvent extraction, electrowinning and mesoporous silica
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· 1. Overview of the gold elution process Gold elution, as the name suggests, refers to the process in which the gold element adsorbed by activated carbon after leaching from the ore is extracted
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· GC Column Solvent Retention Table. Technical Overview. Introduction. This solvent retention table provides useful data in terms of relative retention order of 275 solvents compounds on the DB-1, DB-624 and DB-WAX phases. This information is particularly useful for determining impurities in bulk solvents. A wide range of chemical
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Are isocratic elution and volume overload options to improve process economics? - ？ Desorption ratio attained 97.35% and the purity of procyanidins was 95.25% when the
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· This study is concerned with the use of mixed solvents for the elution of the cyanide complexes of copper and gold from Purolite A500, a strong-base anion exchange resin. The mixed solvents investigated include acetone + water, dimethylsulfoxide + water and N -methyl-2-pyrrolidone + water.
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The extraction of metals with SCF solvents has been examined mainly in the analysis of environmental samples and the treatment of metal contaminated wastes. Nonetheless, some interesting results have been reported recently on the extraction of rare earth metals, which highlight the potential of SCF solvents in mineral processing applications (Laintz and
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DOI: 10.1016/0304-386X(85)90031-3 Corpus ID: 97441229 Elution of gold from carbon by the micron solvent distillation procedure @article{Muir1985ElutionOG, title={Elution of gold from carbon by the micron solvent distillation procedure}, author={David M. Muir and
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In 1950, Zadra9, in a pilot-plant study, demonstrated the technical and commercial viability of sodium sulphide solutions for the elution of gold at ambient temperatures. He showed the carbon to be eluted efficiently in 4 hours at 25°C, and both the carbon and the eluate were found to be re-usable.
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Numerous articles have appeared on the mechanism of the adsorption of gold cyanide onto activated carbon. In contrast, little information is available on the mechanism of elution of the adsorbed gold. It is the objective of this article to formulate such a mechanism on the basis of batch and column elution tests without analyzing adsorbed species on the
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Some of the parameters affecting the elution of gold from freshly loaded activated carbon using pure water as an eluant were studied. The procedure involved pretreatment of the
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· Liquid–liquid or solvent extraction is a common process for selectively concentrating metals. Liquid–liquid extraction is performed using an organic extractant that is dissolved in an organic phase. The organic phase is allowed to contact an aqueous phase containing the dissolved metal or metal ion complex. Thus, two liquids are used, hence
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· Since the extraction kinetics of solvent extraction systems (SX) are usually fast and the process can operate through continuous stages, solvent extraction technology offers an alternative
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· The Anglo elution procedure ( Davidson and Duncanson, 1977; Davidson and Veronese, 1979) is an alternative approach, which elutes gold in 8–12 h using deionised water at 100–120 °C. In this procedure, the carbon is pre-soaked with 5% w/v NaCN/1% w/v NaOH solution. This process is sensitive to the quality of water used.
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