| 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 Fe3+ and promoted the leaching of gold. |
