铅冶炼中间物料处理实践

The practice of dealing with intermediate materials in lead smelting

铅的火法冶炼处理过程中底吹炉烟灰需要定期开路,约投料量的1%(成分:As:1%~4%,Cd:10%~20%,Pb:34%~40%,Zn:1%~6%);氧化锌烟尘经过浸出、电积、熔铸锌锭过程中产生浮渣,约为锌锭的3%~5%(成分Zn:80%,其中金属锌占40%左右);铅阳极泥冶炼过程中产出的毛银(含银:50%~60%,铜10%~20%),常规熔炼会造成铜无法开路,大部分闭路循环。烟灰和浮渣中间物料堆存不但造成资金积压,而且还污染环境,毛银处理目前不但周期长,而且成本高等,为此针对这部分中间物料的处理开展工艺研究、设备选型、工艺设计等综合回收有价元素,解决物料堆存、资金占用,变废为宝。

Lead pyrometallurgical treatment process bottom-blown furnace soot needs to be opened periodically,about 1%of the feeding volume(composition:As:1%-4%,Cd:10%-20%,Pb:34%-40%,Zn:1%-6%).Zinc oxide fumes are leached,electrowinned and slagged in the process of melting and casting zinc ingots,which is about 3%to 5%of the zinc ingot(composition Zn:80%,of which zinc metal accounts for about 40%).Gross silver(silver content:50%-60%,copper 10%-20%)from lead anode slime smelting process.Conventional melting results in copper not being able to open the circuit and most closed-circuit cycles.Dust and scum intermediate material stockpiling not only cause capital backlog,but also pollute the environment,gross silver treatment is not only a long period,and the cost is high,for this part of the intermediate material handling process research,equipment selection,process design and other comprehensive recovery of valuable elements,to solve the material stockpiling,capital consumption,waste into treasure.