硫化沉淀法从酸性淋洗液中提金试验研究

Experimental research on gold recovery from acid leaching solution by sulphuration precipitation

某黄金冶炼渣经高温氯化焙烧,金以氯化物形式挥发进入烟尘,再经湿式收尘设备喷淋收集得到淋洗液。该淋洗液pH值为0. 16,Au质量浓度1. 21 mg/L,具有一定回收价值。采用硫化沉淀法从该淋洗液中回收金,考察了沉淀剂、反应时间、反应温度等因素对Au沉淀率的影响。结果表明:采用甲硫醇钠作为沉淀剂,在沉淀剂与淋洗液体积比1∶2,反应时间40 min,反应温度40℃条件下,Au沉淀率达到99. 17%;沉淀再经洗涤、焙烧可获得纯度较好的金产品。

High temperature chlorination roasting was used to treat certain gold smelting slag,and the gold in the slag was volatilized into the dust in the form of chloride,then sprayed by wet dust collection equipment to collect the acid leaching solution with pH = 0. 16 and gold mass concentration 1. 21 mg/L that is worth recovery. Gold was recovered from the acid leaching solution by sulphuration precipitation method. The effects of precipitators,reaction time and reaction temperature on gold precipitation rate were discussed. The results showed that the precipitation rate of gold reached 99. 17 % with methyl mercaptan sodium as precipitant at the conditions of precipitant-leach solution volume ratio 1 ∶ 2,reaction time 40 min and reaction temperature 40 ℃,then high purity gold products can be obtained by washing and roasting.