Deng Tong, Ling Yunhan
Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China.
Waste Manag Res. 2007 Oct;25(5):440-8. doi: 10.1177/0734242X07077613.
Clean processing of copper converter slag to reclaim cobalt and copper could be a challenge. An innovative and environmentally sound approach for recovering valuable metals from such a slag has been developed in the present study. Curing the slag with strong sulphuric acid, without re-smelting or roasting as practiced currently in the industry, render it accessible to leaching, and more than 95% of cobalt and up to 90% of copper was extracted together with iron by water leaching, leaving silica behind in a residue. The copper in the leach liquor was recovered by cementation with iron and the dissolved iron crystallized as ferrous sulphate monohydrate. The cobalt in the mother-liquor rich in iron was recovered by either cementation or sulphide precipitation. Operation variables in the new process were also investigated and optimized.
对铜转炉渣进行清洁处理以回收钴和铜可能是一项挑战。本研究开发了一种创新且环保的方法，用于从此类炉渣中回收有价金属。用浓硫酸对炉渣进行固化处理，而不像目前行业中那样进行再熔炼或焙烧，这使得炉渣易于浸出，通过水浸出可提取超过95%的钴以及高达90%的铜和铁，而二氧化硅则留在残渣中。浸出液中的铜通过用铁置换回收，溶解的铁结晶为一水硫酸亚铁。母液中富含铁的钴通过置换或硫化物沉淀回收。还对新工艺中的操作变量进行了研究和优化。
