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含金硫化物矿石在其硫化物晶格中常含有细分散的金和其它贵金属颗粒。由于贵金属颗粒被包裹,因此,这类矿石难于用常规的提取方法进行处理,致使金属常常残留于尾渣中而被弃失。本工作研究了在使用普通的提取技术(例如氰化法)之前,先采用生化浸出法对这类难处理的尾渣进行预处理的可能性。将含金黄铁矿的Leadville金矿尾渣先用泡沫浮选法浮选富集。在氰化浸出前,黄铁矿精矿用驯化12个星期的氧化铁硫杆菌进行不同周期的处理。氰化浸出前精矿经生化浸出处理可使金的提取率从32％提高到95％,银的提取率从48％提高到大于98％。
Gold-bearing sulphide ores often contain finely divided gold and other precious metal particles in their sulfide lattices. Due to the inclusion of precious metal particles, it is difficult to treat such ore with conventional extraction methods, leaving the metal often left in the tailings and discarded. This work examined the possibility of pretreatment of such refractory tailings using biochemical leaching prior to use of common extraction techniques such as cyanidation. Lead gold gold ore tailings gold flotation froth enrichment. Prior to cyanide leaching, pyrite concentrates were treated with different periods of 12-week-old Thiobacillus ferrooxidans. The biochemical leaching of the concentrate before cyanidation leaching can increase the gold extraction rate from 32% to 95% and the silver extraction rate from 48% to over 98%.