某氰化渣的改性石硫合剂法浸金研究

摘要

某氰化渣中金的品位为12.03 g/t，氰化渣里游离金的颗粒极细，并且被铁氧化物包裹,难以解离，属于难浸类金矿。采用改性石硫合剂对氰化渣进行了浸金研究，考察了超细磨时间、氧化剂用量、矿浆pH和搅拌时间对金浸出率的影响。优化实验条件为：超细磨时间2 h、氧化剂CaO2用量0.78 g/500 g、矿浆pH≈11.5、液固比2：1、搅拌浸出时间24 h，金的浸出率达78.57%。%The gold grade in the cyanide residue is 12.03 g/t in a certain gold mine. The fine distribution of free gold wrapped with iron oxide in the cyanide residue usually makes the valuable single mineral difficult to dissociate, as a part of the refractory gold ore. Leaching tests of gold using modified Lime-Sulphur-Synthetic-Solution (MLSS) was investigated to leaching the residue. The influence of gold leaching rate from cyanide residue by superfine grinding time, oxidant dosage, slurry pH and mixing time were discussed. The optimal experimental conditions were determined as follows:ultrafine grinding time 2 h, the dosage of oxidant CaO2 0.78 g/500 g, pH value of 11.5, the liquid-solid ratio 2:1 and stirring leaching time of 24 h. Under the optimal condition, the gold leaching rate was 78.57%.