熔融转炉铜渣贫化法回收铜  

A novel slag cleaning method to recover copper from molten copper converter slag

作　　者：王坤 刘燕[1,2] 郝君 豆志河[1,2] 吕国志 张廷安 Kun WANG;Yan LIU;Jun HAO;Zhi-he DOU;Guo-zhi LV;Ting-an ZHANG(School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]多金属共生矿生态冶金教育部重点实验室,沈阳110819

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第8期2511-2522,共12页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U1710257,U1702253,U1903129);the National Key R&D Program of China(Nos.2017YFC0210403,2017YFC0210404)。

摘　　要：为了从铜渣中回收铜,提出熔融铜渣贫化回收铜的新方法。首先计算贫化过程的热力学和FeO−SiO_(2)二元相图,然后研究实验参数对Fe_(3)O_(4)还原和铜回收率的影响规律,分析贫化机理。结果表明:氧化硅的加入可以明显降低黄铁矿还原磁铁矿的初始反应温度。最优条件下,铜渣中的Fe_(3)O_(4)和铜含量分别降低至2.45%和0.39%(质量分数),铜回收率为92.52%。贫化后,超过94%的银和99%的金沉降在铜锍中。大约72%的锌和75%的铅挥发进入烟气。由于磁铁矿的还原,铜渣的黏度从0.68 Pa·s降低到了0.12 Pa·s,并且机械搅拌可以强化铜锍液滴的沉降。To recover copper from copper slag,a novel slag cleaning method was proposed.The thermodynamics and binary phase diagram of FeO−SiO_(2) were calculated first.Then,the effects of experimental parameters on the reduction of Fe_(3)O_(4),recovery of copper,and slag cleaning mechanism were investigated.The results showed that the addition of SiO_(2) significantly reduced the initial reduction temperature of magnetite and pyrite.The contents of Fe_(3)O_(4) and copper decreased to 2.45 wt.%and 0.39 wt.%,respectively,with copper recovery of 92.52%under the optimum conditions.More than 94%silver and 99%gold subsided into the copper matte after slag cleaning.Approximately 72%of zinc and 75%of lead volatilized in the flue gas.The viscosity of the copper slag decreased from 0.68 to 0.12 Pa·s due to the reduction of magnetite.The sedimentation of copper matte droplets could be enhanced by mechanical stirring.

关 键 词：铜渣 铜回收 贫化 磁铁矿还原 机械搅拌 

分 类 号：TF811[冶金工程—有色金属冶金]