Results 211 to 220 of about 11,365 (265)

Gold Leaching with Humic Substances

Journal of Mining Science, 2019
The study results of gold leaching using the products of humic acids, as well as stage-by-stage fractionation of parent and gold-containing substances of these acids are presented. The gold content in the pregnant solution was up to 14–30 mg/l. Chemical analysis of the supernatant obtained by a stepwise change in pH of the solution and subsequent ...
A. V. Zashikhin, M. L. Sviridova
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Anaerobic thiosulfate leaching: Development of in situ gold leaching systems

Minerals Engineering, 2008
Ferric EDTA and ferric oxalate complexes are both effective oxidants for the aerobic and anaerobic dissolution of gold in thiosulfate solutions, and therefore are potential candidates for the development of an in situ leaching system. The thiosulfate and polythionates were quantified during leaching using HPLC with perchlorate eluent and an anion ...
J.A. Heath, M.I. Jeffrey, H.G. Zhang, J.A. Rumball   +3 more
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Pyrite flotation from gold leach residues

Minerals Engineering, 1994
Abstract GENMIN Process Research has been investigating the possibility of a low cost pyrite flotation process suitable for cyanidation leach residue. The flotation of auriferous pyrite in gold leach residues through traditional techniques is only possible after conditioning with sulphuric acid to overcome depression by cyanide and hydroxide.
G. Hodgkinson, R.F. Sandenberght, C.J. Hunter, J.R. De Wet   +3 more
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Thiosulfate leaching of gold—A review

Minerals Engineering, 2001
Abstract The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed.
M.G Aylmore, D.M Muir
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Thiourea–thiocyanate leaching system for gold

Hydrometallurgy, 2011
Abstract The leaching of gold in thiourea–thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. The effects of initial concentrations of ferric, thiourea (Tu) and thiocyanate as well as temperature and pH on gold leaching rates were studied. An initial gold leaching rate in the order of 10− 9 mol cm− 2 
Xiyun Yang, Michael S. Moats, Jan D. Miller, Xuming Wang, Xichang Shi, Hui Xu   +5 more
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Alkaline sulfide gold leaching kinetics

Minerals Engineering, 2016
Abstract Recently, leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment. Also, in some gold bearing ores and concentrates, conventional cyanide leaching is not the best method for gold extraction.
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Fosterville gold mine heated leach process

Mineral Processing and Extractive Metallurgy, 2012
AbstractThe Fosterville Gold mine is located approximately 20 km to the East of Bendigo in central Victoria. The gold at Fosterville occurs as solid solution within disseminated arsenopyrite and pyrite. The Fosterville ore bodies contain various amounts of native carbon in the form of bituminous coal.
M Binks, P Wemyss
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Thiosulfate leaching of gold from waste mobile phones

Journal of Hazardous Materials, 2010
The present communication deals with the leaching of gold from the printed circuit boards (PCBs) of waste mobile phones using an effective and less hazardous system, i.e., a copper-ammonia-thiosulfate solution, as an alternative to the conventional and toxic cyanide leaching of gold.
Vinh Hung, Ha, Jae-chun, Lee, Jinki, Jeong, Huynh Trung, Hai, Manis K, Jha   +4 more
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Fundamental Kinetic Models for Gold Ore Cyanide Leaching

Canadian Metallurgical Quarterly, 1996
AbstractExisting studies of gold ore cyanidation kinetics demonstrate significant diversity in estimated kinetic parameters. By taking into account the size distribution of gold grains in the ore it was made possible to explain this diversity and the apparent “homogeneous” behaviour ofthe heterogeneous particles.
D RUBISOV, V PAPANGELAKIS, P KONDOS
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Biooxidation-thiosulfate leaching of refractory gold concentrate

International Journal of Minerals, Metallurgy and Materials, 2020
A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (
He-fei Zhao, Hong-ying Yang, Lin-lin Tong, Qin Zhang, Ye Kong   +4 more
openaire   +1 more source