铜渣转底炉直接还原回收铁锌工艺研究  

Study on Recovery of Iron and Zinc from Copper Slag by Direct Reduction Process in Rotary Hearth Furnace

作　　者：刘占华 陈文亮 丁银贵 曹志成 吴道洪 余文[2] Liu Zhanhua;Chen Wenliang;Ding Yingui;Cao Zhicheng;Wu Daohong;Yu Wen(Beijing Branch of Jiangsu Metallurgical Design Institute Co.,Ltd.,Beijing 102200 ,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000 ,China)

机构地区：[1]江苏省冶金设计院有限公司北京分公司,北京102200 [2]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《金属矿山》2019年第5期183-187,共5页Metal Mine

基　　金：江西省自然科学基金资助项目(编号:20171BAB216021);中国博士后基金面上资助项目(编号:2018M642591)

摘　　要：为解决国内某铜渣的开发利用问题,以兰炭为还原剂、白云石为添加剂,采用模拟转底炉直接还原—磨矿—磁选工艺,对有价元素铁、锌的回收及杂质硫的脱除进行了研究。结果表明:在兰炭用量为25%,白云石用量为10%,还原温度为1 300℃,还原时间为35 min情况下,直接还原过程的锌脱除率为99.14%,可获得ZnO含量为79.59%的氧化锌粉,金属化球团经磨矿、磁选后,获得了铁品位为92.79%、铁回收率为88.12%、硫含量为0.08%的金属铁粉。机理分析表明,铜渣中的铁橄榄石、磁铁矿相大部分已转变为金属铁相,金属铁颗粒明显聚集长大,最大粒度超过100μm,且与脉石矿物等存在清晰平滑的界面,有利于后续磨矿、磁选工序得到高品位的金属铁粉。In order to solve the problem of development and utilization of a copper slag in China,the recovery of valuable element iron and zinc,and as well as the removal of impurity sulfur were studied by direct reduction-grinding magnetic separation process in simulated rotary hearth furnace with semi-coke as reducing agent and dolomite as additive.The results showed that the removal rate of zinc in direct reduction process was 99.14%,the ZnO content was 79.59% in zinc oxide powder under the conditions of 25% semi-coke,10% dolomite,1 300 ℃ reduction temperature and 35 minutes reduction time, and the metallic iron powder with 92.79% iron grade and 0.08% sulfur content was obtained with an iron recovery of 88.12% by grinding and magnetic separation from metallized pellets.The mechanism analysis showed that most of the iron-bearing minerals in copper slag had been transformed into metallic iron phases,which presented obvious aggregation and growth.The maximum metal iron particles could reach more than 100 microns,and there was a clear edge between the iron and gangue minerals,which would be propitious to obtain high-grade metallic iron powder by subsequent grinding and magnetic separation processes.

关 键 词：铜渣 转底炉 直接还原 金属铁粉 

分 类 号：TD925.7[矿业工程—选矿]