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以含铁氰化渣为原料进行了酸浸试验,考察了浸出酸用量系数、浸出温度和浸出时间对铁浸出率的影响。热力学分析结果表明,氰化渣中的铁氧化物在高温、浓酸条件下以可溶性铁离子形式进入浸出液。试验结果表明:在硫酸浓度45%、硫酸用量系数(硫酸理论用量的倍数)1.5、盐酸用量0.1 m L/g、体系沸点温度下、液固比3∶1、浸出时间4 h的最佳条件下,铁浸出率为96.53%;然后采用胶体分散法制备聚合硫酸铁回收浸出液中的铁。浸出渣氰化浸出试验结果表明,金浸出率达到98.82%,为实现氰化渣的综合利用提供了一种新的处理工艺。
The acid leaching test was carried out on ferric cyanide-containing slag as the raw material. The effects of leaching acid dosage, leaching temperature and leaching time on leaching rate of iron were investigated. Thermodynamic analysis showed that the iron oxides in cyanidation slag enter the leachate as soluble iron ions under high temperature and concentrated acid conditions. The results showed that the optimal conditions of sulfuric acid concentration 45%, sulfuric acid dosage 1.5 (the theoretical amount of sulfuric acid) 1.5, hydrochloric acid 0.1 mol / g, liquid-solid ratio 3: 1 and leaching time 4 h , The leaching rate of iron was 96.53%; then the colloidal dispersion was used to prepare the iron in the recovery of the polymerized ferric sulfate. Leaching residue cyanidation leaching test results show that the gold leaching rate of 98.82%, in order to achieve the comprehensive utilization of cyanide residue provides a new treatment process.