铜尾渣深度还原回收铁工艺研究  

Study of Deep Reduction Process for Iron Recovery from Copper Slag Tailings

作　　者：王爽[1,2] 倪文[1,2] 王长龙[1,2,3] 李德忠[1,2] 王红玉[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083 [3]河北工程大学土木工程学院,河北邯郸056038

出　　处：《金属矿山》2014年第3期156-160,共5页Metal Mine

基　　金：国家高技术研究发展计划(863计划)项目(编号:2012AA062406)

摘　　要：为给含铁铜渣深度资源化利用提供技术依据,以国内某铜渣磨矿—浮选选铜尾矿为原料,以焦粉为还原剂、氧化钙为添加剂,以含铁硅酸盐还原成金属铁为目标,以还原产物磨矿—弱磁选精矿指标为评价依据,进行了还原焙烧工艺条件研究。试验结果表明:①还原温度和还原时间对还原效果影响显著;②在氧化钙用量为6%、焦粉用量为14%、还原温度为1 300℃、还原时间为2 h情况下,获得的金属铁粉的铁品位为92.96%、铁回收率为93.49%,且杂质硫磷含量低,属优质炼钢辅料。铜尾渣深度还原产物的SEM分析表明,还原产物中金属铁颗粒粒度较均匀,形状较规则,嵌布关系较简单,无明显夹杂其他渣相的现象,这为后续磨选作业实现铁颗粒的较好解离和获得较好分选指标创造了条件。In order to provide technical basis for deep utilization of iron-bearing copper slag,the conditioning tests of re- duction roasting process was researched, by using domestic copper slag from grinding-copper flotation as raw materials, coke powder as the reduction agent, calcium oxide as additive, aiming at reducing iron silicate to metallic iron, and taking the quality of grinding-low intensity magnetic separation concentrate from reduction product as evaluation index basis. The results showed that ：（1）reduction temperature and reduction time have significantly effect on reduction efficient ;（2）the low magnetic metallic i- ron powder with iron grade of 92. 96% ,iron recovery of 93.49% and with less sulfur and phosphorus was obtained on condi- tions of CaO dosage of 6% ,coke powder dosage of 14% ,reduction time for 2 h at 1 300 ~C. So,it belongs to the steel-making additive. The SEM analysis of the deep reduction product from copper slag indicated that metallic iron fine grains had uniform particle sizes and relatively regular shape, and embedded simply without obviously inclusions of other slag phase. It provides the advantages for latter grinding and separation process and for obtaining good separation indexes.

关 键 词：铜渣 铁回收 焦粉 深度还原 金属铁 

分 类 号：TD925.7[矿业工程—选矿] TD926.4