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Showing 1 to 9 of 9 for “"Gold Recovery"”.
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… of exposed sulfide minerals. In the case of gold ores, the mining and beneficiation may also produce As-bearing wastes and this can accelerate the natural mechanisms of As mobilization. The Bakyrchik is the largest gold deposit in Kazakhstan and one of the largest in the world. Gold (Au) is …
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Biological and Chemical Oxidation of Sulfidic Minerals at Alkaline pH
The oxidation of sulfidic minerals to liberate gold is currently performed with the utilization of microorganisms and chemical reagents. Biooxidation is a hydrometallurgical oxidation method which can be a pre-treatment method for gold recovery. Iron- and sulfur-oxidizing microorganisms with …
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Electrochemical study of gold thiosulfate extraction process
Thiosulfate has received a specific attention in gold extraction industry as a non-toxic alternative lixiviant for cyanidation process. Barrick Gold Corporation has commercialized thiosulfate gold leaching process in Goldstike mine in Nevada, USA. However, there is still potential for technical …
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Biooxidation and Thiocyanate Leaching of Refractory Gold Ore in One-Step
Gold is among the precious metals and for more than a century, it has been extracted by the cyanidation process. Cyanide is highly toxic for humans and living organisms. Moreover, with increasing gold extraction over time, the average gold grade in minerals has decreased and simultaneously cyanide …
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Comparison of gold extraction yields by cyanide treatment vs. bioleaching procedure
… in column experiments to compare the gold recovery yields in the effluents. Four columns were treated with a different liquid: water, bacteria, NaCN and a mixture of cyanide and bacteria. After they were leached the effluents were analyzed to determine gold yields. During experiment I …
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Socio-technical assessment of mercury and gold losses in artisanal and small-scale mining (ASM) operations in Colombia, A
In Colombia, the artisanal and small-scale gold mining (ASGM) sector represents about 70% of the mining activities, and approximately 80% of Colombia’s gold comes from this sector. In addition, the ASGM sector in Colombia releases about 90 tons of mercury per year. Although the Colombian government …
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Sustainable Nanotechnology: Life Cycle Thinking in Gold Nanoparticle Production and Recycling
… LCA modeling to reduce the life cycle impacts of gold nanoparticle (AuNP) production. The LCA studies were focused on three aspects of AuNP synthesis: 1) the use of bio-based ("green") reducing agents; 2) the potential for recycling gold from nanomaterial waste; and, 3) the reduction of the life …
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The effect of pH and dissolved organic carbon on the growth kinetics of Ac. cupricumulans JTC3 and L. ferriphilum HT pertinent to the BIOX® process
… process was designed to pre-treat refractory gold-bearing concentrates to enable gold recovery. It, and related, processes are well accepted commercially. An iron- and sulfur-oxidizing microbial consortium provide lixiviants for dissolution of mineral sulfides. The autotrophic iron-oxidizing …
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Exploration of the thiosulphate process for the dissolution of gold from electronic waste and its recovery through ion-exchange
… The value is attributed to the metals such as gold, silver, copper and palladium found in e-waste. Printed circuit boards (PCBs) are a small but nonetheless crucial fraction of global e-waste making up 6% by mass. The gold content in this small fraction is of much higher concentrations than in …