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低品位的金矿氰渣经过氯化挥发系统产生高温烟气冷凝后形成高金的酸性金泥,加入保护碱调节pH之后,一般直接进入氰化浸出回收金,氰化法回收金泥中的金存在着回收率偏低、药剂消耗大、金柜滤布堵塞等一系列问题。本文采用氯化法浸出金泥,即在盐酸介质中加入氯化钠作氧化剂,并研究了盐酸浓度、氯酸钠浓度、浸出温度、浸出时间对金浸出率的影响。经氯化浸出、浸出液铁粉置换、尾渣二次氯化挥发工序可以有效回收了金泥中的金。在液固比为2︰1,盐酸浓度为15%,氯酸钠用量为60 kg/t,浸出温度为20℃,浸出时间为4 h时,金的浸出率达到92%以上,与之对比的氰化平均浸出率为89.37%,与氰化法相比浸出率提高了3%~5%,浸出时间由24 h缩短为4 h;铁粉置换氯化浸出液中金、铜的置换率分别达到99%以上。
The low-grade gold mine cyanide residue generates high-gold acidic gold mud after high-temperature flue gas is condensed by the chlorination volatilization system. After the protective alkali is added to adjust the pH, cyanide leaching recovery gold is generally directly fed into the cyanide recovery gold deposit The recovery rate is low, expensive pharmaceuticals, cabinets filter plugging a series of problems. In this paper, gold chloride was leached by chlorination, that is, sodium chloride was added into hydrochloric acid as oxidant, and the effects of hydrochloric acid concentration, sodium chlorate concentration, leaching temperature and leaching time on gold leaching rate were studied. Leaching by chlorination, leaching solution of iron powder, tailings secondary chlorination volatilization process can effectively recover the gold in gold mud. In the liquid to solid ratio of 2: 1, hydrochloric acid concentration of 15%, sodium chlorate dosage of 60 kg / t, the leaching temperature of 20 ℃, the leaching time of 4 h, the gold leaching rate of 92% or more, compared with The average leaching rate of cyanide was 89.37%, the leaching rate increased 3% ~ 5% compared with cyanidation method, the leaching time was shortened from 24 h to 4 h; the replacement rates of gold and copper in the iron chloride replacement leaching solution reached respectively 99% or more.