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  • Leaching of gold and silver from Miller Process dross

    01.08.1996· Leaching of gold and silver from the Miller Process dross was investigated using non-cyanide leachants. The dross was found to be very refractory to direct leaching with thiourea as well as thiosulphate. Thiourea leaching of the calcined dross resulted in about 84% extraction of gold, but the leaching of silver was very poor. Salt roasting of the dross enhanced the leaching of both gold and silver. In a two-stage leaching of the salt-roasted dross

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  • (PDF) Leaching of gold, silver and accompanying metals

    26.03.2015· The ammonium thiosulphate based leaching of gold and silver from PCBs waste, using crushing as a pretreatment, was investigated. It was possible to achieve 98 % gold and 93 % silver recovery within...

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  • Evaluation of gold and silver leaching from printed

    Evaluation of gold and silver leaching from printed circuit board of cellphones. Petter PM(1), Veit HM(2), Bernardes AM(2). Author information: (1)LACOR, PPGE3M, Universidade Federal do Rio Grande do Sul, Campus do Vale, Setor 4, Prédio 74, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil.

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  • Leaching of gold and silver from printed circuit board of

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold. A similar result was obtained at 0.1M ammonium thiosulfate and

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  • Thiourea leaching gold and silver from the printed circuit

    01.06.2012· Thiourea is a selective and less hazardous agent as an alternative to the conventional and toxic cyanide. The agent was applied to leach gold and silver from PCBs of waste mobile phones. The influence of the particle size, thiourea and Fe 3+ concentrations and temperature was investigated. In the best condition, about 90% of gold and only 50% of silver were leached with a contact time of 2 h. The thiourea

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  • US5073354A Process of stripping gold and silver from

    Gold and silver are stripped from activated carbon on which they are adsorbed as cyanide complexes by subjecting the activated carbon to a stripping solution comprising as

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  • Gold Metallurgy and Leaching Process

    Leaching, often gold, is the process of extracting a soluble constituent from a solid by means of a solvent. In extractive metallurgy, of gold, it is the process of dissolving a certain mineral (or minerals) from an ore or a concentrate, or dissolving certain constituents from materials such as a calcines, mattes, scrap alloys, anodic slimes, etc., to achieve either one or two purposes

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  • Explain the leaching process of silver and gold using

    The addition of gold or silver to an alkaline sodium cyanide solution will cause the metals to react with the cyanide and dissolve them into the solution. The process is called cyanidation or leaching.

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  • Recovery of Silver, Gold, and Lead From a Complex Sulfide

    A ferric chloride (FeCI3) preleach, at 40° C in 6 h, extracted about 50 pct of the zinc and formed insoluble silver and lead chlorides. Subsequent acid thiourea leaching, for 1 to 3 h at 40° C, extracted about 85 pct of the gold and silver.

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  • (PDF) Leaching of Gold and Silver from Crushed Au-Ag

    Thiourea leaching has more rapid kinetics for gold and silver solubilization than classical cyanide leaching [9][10][11][12][13].The aim of this work was to examine the possibility of recovering gold and silver from electronic, goldsmith's and ceramic wastes using thiourea leaching. Crushing was ap-plied in order to determine its effect on the recovery of gold and silver. EXPERIMENTAL

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  • Evaluation of gold and silver leaching from printed circuit

    Evaluation of gold and silver leaching from printed circuit board of cellphones. Petter PM(1), Veit HM(2), Bernardes AM(2). Author information: (1)LACOR, PPGE3M, Universidade Federal do Rio Grande do Sul, Campus do Vale, Setor 4, Prédio 74, Av. Bento

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  • Leaching of gold and silver from anode slime with a

    In order to develop a hydrometallurgical process to recover gold and silver from anode slime resulted from the treatment of copper sludge, leaching experiments of the anode slime were performed by a mixture of HCl and some oxidizing agents (H 2 O 2, NaClO, and HNO 3).Effect of the concentration of oxidizing agents, reaction temperature and time, pulp density and stirring speed on the leaching

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  • Leaching of gold and silver from printed circuit board of

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold. A similar result was obtained at 0.1M ammonium thiosulfate and 0.2M ammonium hydroxide, when

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  • Thiourea leaching gold and silver from the printed

    The influence of particle size, thiourea and Fe 3+ concentrations and temperature on the leaching of gold and silver from waste mobile phones was investigated. Gold extraction was found to be enhanced in a PCBs particle size of 100 mesh with the solutions containing 24 g/L thiourea and Fe 3+ concentration of 0.6% under the room temperature. In this case, about 90% of gold and 50% of silver

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  • Environmentally friendly process instead of cyanide

    Recycling is a significant source for the supply of gold and has a pronounced effect on its price. The flotation method, which is more economical and more environmentally friendly than cyanide leaching, has been investigated for recycling gold and silver from jewellery slag. A jewellery slag sample containing 28.3 ppm Au and 42.0 ppm Ag was

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  • US5073354A Process of stripping gold and silver from

    Gold and silver are stripped from activated carbon on which they are adsorbed as cyanide complexes by subjecting the activated carbon to a stripping solution comprising as the strippant an effective amount of a compound containing the carboxylate functionality. The compound is preferably selected from benzoic and substituted benzoic acids, and polyacrylic acids of less than about 100,000 m.w.

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  • Explain the leaching process of silver and gold using

    The addition of gold or silver to an alkaline sodium cyanide solution will cause the metals to react with the cyanide and dissolve them into the solution. The process is called cyanidation or leaching.

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  • (PDF) RECOVERY OF SILVER FROM CYANIDE LEACH

    Silver behaves similar to gold in the most stages of leaching and recovery processes and ends up in gold bullion. Separation and recovery of silver from cyanide leach solutions therefore offers

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  • (PDF) SULPHIDE PRECIPITATION OF GOLD AND SILVER

    Leaching profiles of gold, silver and copper from the pyritic gold/silver concentrate (0.1 M S 2 O 3,1.5 M NH 3,pH 9.5- 10) 15 th International Mineral Processing Symposium, Istanbul-Turkey

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