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由于细菌浸出反应速度慢,产生稀的浸出液,且需要的反应器大,投资高,因而用它提取金属一直受到限制,至今在工业上仅限于在堆浸中应用。反应速度慢是由于细菌在被处理物料上繁殖慢所致。如果在最佳理想条件,即具有繁殖细菌的理想物料、适宜的温度、pH和矿浆密度下进行繁殖的话,则可在进行浸出之前得到大量的细菌。分隔发生器的原理是在其本身的最佳环境中完成一个单元操作,以便有足够的细菌群用来浸蚀被浸出的物料。 对于由浸蚀暴露出金的含金黄铁矿用常规氰化物浸出进行了研究。金的回收率从50％增加到90％。较详细地研究浸出反应的结果表明,细菌作用所产生的硫酸铁浸蚀了黄铁矿。无机硫酸铁没有这样的效果,这是因为矿粒上硫的沉积阻止了这种反应。当使用由细菌产生的硫酸铁时,细菌分泌出的硫代葡萄糖酸盐(gluco—thionate)使硫溶解,使反应得以进行
Due to the slow rate of bacterial leaching reaction, the production of dilute leachate, and the need for a large reactor, high investment, so use it to extract the metal has been limited, so far in the industry is limited to heap leaching applications. The slow reaction is due to the slow propagation of bacteria on the treated material. If the best ideal conditions, that is, the ideal material with breeding bacteria, the appropriate temperature, pH and pulp density to reproduce, you can get a lot of bacteria before leaching. The principle of separating generators is to perform a unit operation in their own best environment so that there is enough bacteria to attack the leached material. Studies have been conducted with conventional cyanide leaching of gold-bearing pyrite exposed by gold. Gold recovery increased from 50% to 90%. A more detailed study of the leaching reaction showed that the ferric sulfate produced by bacterial action eroded pyrite. Inorganic ferric sulphate has no such effect because the deposition of sulfur on the ore particles prevents this reaction. When using ferric sulfate produced by bacteria, the gluco-thionate secreted by the bacteria solubilizes the sulfur, allowing the reaction to proceed