改性石硫合剂(ML)浸金试剂稳定性研究

Study on Stability of ML Reagent

改性石硫合剂(ML)是一种新型非氰浸金试剂。主要研究了不同通气量、碱度、铜离子浓度、亚硫酸根离子浓度、搅拌速度、温度对ML试剂中有效浸金成分的消耗影响。结果表明:(1)通气、碱度、搅拌速度对于ML试剂中S2O32-的消耗并不是主要影响因素;(2)铜离子对ML试剂中S2O32-的消耗影响显著。体系中有游离氨、低温时,ML试剂稳定性较好;(3)加入SO32-有助于ML体系的稳定,其主要作用是:可阻碍体系中S2O32-的氧化;能促进体系中沉淀物的返溶,并生成有效溶金成分。

Modified lime-sulphur-sythetic-solution （ML） was a new non-cyanide reagent for gold leaching. Influences of aerate, alkalinity, concentrations of Cu^2＋ and SO3^2-, stirring speed and temperature on consumption of the primary ingredient of gold leaching were investigated in ML system. The results showed that： （1） aerate, alkalinity, stirring speed were not the main influence factors on the consumption of S2O3^2- in ML. （2） Cu^2＋ could bring much consumption of S2O3^2- in ML. Free NH3 in the system and lower temperature were all beneficial to ML stability. （3） SO3^2- was also vital, because it could hinder S2O3^2- from oxidizing, facilitate the deposits dissolving in ML, and produce effective ingredient of gold leaching.