俄罗斯某含银铅锌矿石的浸锌沉银试验  

Experimental Study on Extracting Zinc with Precipitating Silver from a Russian Silver-lead-zinc Ore

作　　者：张新海[1] 丁冲[1] 

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《金属矿山》2016年第11期81-84,共4页Metal Mine

摘　　要：俄罗斯某含银铅锌矿石铅、锌、银含量分别为11.52%、28.76%和187.00 g/t,铅主要以硫化铅形式存在,占总铅的92.13%;锌主要以氧化锌形式存在,占总锌的92.35%,浮选工艺难以回收其中的锌。对浮铅前的硫酸浸锌工艺条件进行了研究,并对同时浸出的少量银进行了硫脲法回收试验。结果表明,在硫酸浓度为180 g/L,液固比为5,浸出温度为85℃,浸出时间为60 min情况下锌、银、铅的浸出率分别达95.88%、35.51%、4.08%;酸浸液在硫脲用量为理论用量的1.2倍,搅拌反应时间为30 min,沉降时间为6 h情况下沉银,锌的作业损失率为9.02%、银沉淀率为87.23%。试验较好地实现了铅锌分离,且沉银过程中的锌损失量较小。In a silver-lead-zinc ore of Russia,lead,zinc and silver content were 11. 52%,28. 76% and 187. 00 g / t respectively. The lead accounted for 92. 13% of the total,mainly in the form of lead sulfide; The zinc accounted for 92. 35% of the total,mainly in the form of zinc. Zinc is difficult to recover by flotation process. The process of sulfuric acid leaching zinc was studied before lead flotation. Meanwhile the experiment in which a small amount of silver leached was recovered by thiourea has been carried out. The results showed that leaching rate of zinc,silver and lead were respectively 95. 88%,35. 51%,4. 08% under the condition of the sulphuric acid concentration 180 g / L,liquid-solid ratio 5,at the temperature 85 ℃ for the extraction time 60 min. If the dosage of thiourea is 1. 2 times of the theoretical amount,reaction time is 30 min,the silver settling time is 6 h,in the acid solution,the loss rate of zinc is 9. 02% in theleaching process and the silver deposit rate is 87. 23%.In the experiment,the separation of lead and zinc has been achieved,and the loss of zinc is small in the process of silver precipitation.

关 键 词：铅锌矿石 硫酸浸锌 硫脲沉银 

分 类 号：TF11[冶金工程—冶金物理化学]