某浮选金精矿硫代硫酸盐浸金试验研究

Experimental Study on Thiosulfate Leaching of Gold from a Flotation Gold Concentrate

某浮选金精矿采用常规氰化浸出工艺提金,产生大量氰化尾渣,带来一系列环境问题。同时由于铜、铁、锌等伴生矿物大量消耗氰化钠,药剂成本较高,经济效益不理想。为解决氰渣问题和氰化钠消耗过高的问题,试验探究了此矿在铜氨体系下硫代硫酸盐浸金的可行性。先后采用硫代硫酸盐直接浸出工艺、氨浸和碱浸预处理-硫代硫酸盐浸出工艺,开展了探究试验,硫代硫酸盐浸金率达到90%以上,接近生产现场氰化钠浸金指标。

A flotation gold concentrate was extracted by conventional cyanide leaching process,which produced a lot of cyanide tailings,which brought a series of environmental problems.At the same time,because the associated minerals such as copper,iron and zinc consume a lot of sodium cyanide,the cost of reagent is high and the economic benefit is not ideal.In order to solve the problem of cyanide residue and high consumption of sodium cyanide,the feasibility of gold leaching with thiosulfate in copper ammonia system was explored.Thiosulfate direct leaching process,ammonia leaching and alkali leaching pretreatment thiosulfate leaching process were used successively.The gold leaching rate of thiosulfate reached more than 90%,which was close to the gold leaching index of sodium cyanide in production site.