KINETICS OF GOLD LEACHING FROM SULFIDE GOLD CONCENTRATES WITH THIOSULFATE SOLUTION
来源期刊：中国有色金属学报(英文版)1993年第4期
论文作者：Gong Qian Hu Jiexue Cao Changlin
文章页码：30 - 36
Key words：thiosulfate; gold; leaching kinetics; sulfide ore
Abstract: The reaction process for leaching gold from sulfide gold concentrates containing copper with ammonia-ammonium thiosulfate solution containing copper(Ⅱ)can be divided into initial stage and later stage of reaction.Initial stage of reaction is controlled by interface reaction.Lat- er stage of reaction is controlled by diffusion process of reaction through solid products layer. Whole leaching process is under the control of corrosion reaction of pyrite bearing gold.Action of ammonium sulfate in the system is probably as follows:(1)NH4+ and NH3 forms a buffer so- lution;(2)SO4~(2-)ion inhibites the oxidation and decomposition of S2O3 ~(2-)ion.Cu~(2+)ion in the system acts as an oxidant and oxygen makes the Cu~(2-)regenerate.
