从煅烧的铜渣中回收钼

从铜含量为0.77%～1.32%之间的铜渣中回收金属,回收金属主要为铜;然而一些渣也含有0.4%左右的钼,有可能将熔融的铜渣变为一种新原料来开发新工艺,得到新产品。从这点来讲,使用焙烧-浸出工艺处理铜渣是为了回收渣中的钼,用氧化焙烧法将氧化铁转化为不溶性赤铁矿,而铜和钼转化为可溶态溶于酸溶液。因为钼与氧化铁类晶石相结合,在浸出过程中它的还原会受四氧化三铁成分影响,使用硫酸进行渣浸出,钼的回收率超过80%。因此,使用两段工艺,即氧化焙烧后酸浸对钼进行回收,得到的结果表明这种方法的可行性。

RECOVERY OF MOLYBDENUM FROM ROASTED COPPER SLAGS

Recycling copper slags to recover metals has been focused on copper,which is contained in the range of 0.77% to 1.32%;However some slags also contain molybdenum in amount up to 0.4% transforming the copper smelting slags into a potential raw material for the development of new processes to obtain new products.In this regard,copper slags were treated using roasting-leaching process in order to recover the molybdenum content in the slag.Oxidative roasting is used to convert the iron oxide into insoluble hematite,and copper and molybdenum into the soluble form in acidic solution.Since molybdenum is associated to iron oxide spinel type phase,its recovery was influenced by the magnetite content in the slag during the leaching process.Sulphuric acid was used for leaching the slag,and molybdenum shows recovery higher than 80%.Thus,the obtained results show the feasibility for recovering molybdenum using two-step processes,oxidative roasting followed by an acidic leaching.