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采用酸法浸锑-浸锑渣焙烧脱硫-氰化浸金工艺从某锑金精矿中分离提取锑、金。酸法浸锑最佳工艺条件为:温度为95℃、[H+]=4 mol/L、液固比为4∶1、Fe Cl3过量系数为1.1、浸出时间为0.5 h,在此条件下,锑浸出率为99.05%,进入浸锑液的金仅为0.99%,实现了锑、金良好的选择性浸出。对浸锑渣直接氰化浸金,浸金率仅为71.93%。为了提高浸金率,在分析酸性浸锑渣的矿物组成的基础上,对浸锑渣进行氧化焙烧,结果表明:碚砂中硫品位仅为0.18%,硫脱除率达到了99.81%,渣中的单质硫及硫化物显著减少,主要以赤铁矿和脉石矿物为主。最终金浸出率达到95.92%,比浸锑渣直接氰化浸金提高了约24个百分点。
Antimony and gold were separated and extracted from certain antimony gold concentrate by acid leaching antimony-leaching antimony slag roasting desulfurization-cyanide leaching gold. The optimum conditions of acid leaching of antimony were as follows: the temperature was 95 ℃, [H +] = 4 mol / L, the liquid-solid ratio was 4:1, the excess coefficient of FeCl3 was 1.1 and the leaching time was 0.5 h. The leaching rate of antimony is 99.05%, and the amount of gold entering the antimony solution is only 0.99%, which achieves a good selective leaching of antimony and gold. The leaching of antimony residue directly cyanide leaching gold, gold rate was only 71.93%. In order to improve the gold leaching rate, based on the analysis of the mineral composition of the acid leaching antimony slag, the leaching antimony slag was oxidized and roasted. The results showed that the sulfur grade in the sand was only 0.18%, the sulfur removal rate reached 99.81% In the elemental sulfur and sulfide significantly reduced, mainly hematite and gangue minerals. The final gold leaching rate reached 95.92%, which was about 24% higher than the leaching of antimony residue by direct cyanidation.