Pretreatment Process on Refractory Gold Ores with As - j-stageThese options include: roasting oxidation; wet chemical treatment; bacterial peroxidation; and other pretreatments such as: eliminating arsenic in vacuum, .. Meng Yuqun, Wu Minjie, etc. have researched to strengthen the alkaline leaching pretreatment on a gold concentrate with As at normal temperature and pressure.Extraction of Gold from a Low-Grade Double Refractory Gold Ore .A concentrate containing 34.08g/t of gold with the gold recovery ratio of 81.20% was obtained by flotation. After roasting, microwave heating or alkaline pressure oxidation, the gold cyanidation ratio reached 82.37%, 81.26% and 71.09% respectively. Roasting was an effective, reliable and mature technique to oxidize sulfide.
Gold Sulphide Ore Oxidation by Alkaline Pressure - 911 MetallurgistOct 20, 2017 . The U.S. Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite (FeAsS) and/or pyrite (FeS2). Pretreatment of a low grade ore containing 0.4% FeAsS, 3.5% FeS2, and 2.74g/mt Au with 1.2M NaOH, 40 psig 02, 100°.Gold Extraction and Recovery Processes - Semantic Scholarmethods such as pressure oxidation, roasting, chlorination, biooxidation etc are available to treat these . alternative lixiviants to cyanide such as bromides (acid and alkaline), chlorides and thiosulfate are also ... The common definition of "refractory" gold ores, are those ores that do not allow the recovery of gold by.
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Pretreatment Process on Refractory Gold Ores with As - j-stage
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