盐酸浸出焙烧金精矿工艺研究

Study on the Process of Leaching Roasted Gold Concentrate by Hydrochloric Acid

研究了盐酸浓度、反应温度、液固比和反应时间对盐酸浸出焙烧金精矿的影响,用正交试验优化工艺条件。单因素实验表明,盐酸浸出焙烧金精矿的浸出率与盐酸浓度、反应温度和反应时间呈正相关趋势,液固比为1.5:1时具有最大的金浸出率。正交试验表明,在所选择的因素水平范围内,盐酸浓度影响最为明显,反应温度和反应时间影响较大,液固比影响最小。在优化反应条件下(盐酸浓度8 mol/L、液固比1.5:1、90℃浸出90 min),金的浸出率达到95.53%。盐酸浸出后焙烧金精矿中大量赤铁矿被浸入溶液,释放包裹金的同时增加了Fe^3+浓度,促进了金的浸出。

The influence of the concentration of hydrochloric acid,reaction temperature,liquid-solid ratio and reaction time on leaching roasted gold concentrate by hydrochloric acid was studied.Single-factor experiments showed that the leaching percentage of gold concentrate was positively correlated with the concentration of hydrochloric acid,reaction temperature and reaction time.The maximum gold leaching percentage was obtained when the liquid-solid ratio was 1.5:1.Orthogonal tests showed that the concentration of hydrochloric acid had the most obvious influence,and that the reaction temperature and reaction time had a great influence,and that the liquid-solid ratio had the least influence.The optimum reaction conditions was 8 mol/L hydrochloric acid,reaction temperature of 90℃,reaction time of 90 min,liquid-solid ratio of 1.5:1.Under the optimized condition,the leaching percentage was 95.53%.After hydrochloric acid leaching,a large amount of hematite in the roasted gold concentrate was immersed into the solution,which increased the concentration of Fe^3+and promoted the leaching of gold.