摘要
湖北某铜冶炼厂电炉渣浮选铜后的尾渣,Fe品位为35.37%,Mo品位为0.30%,其中铁主要以磁铁矿和铁橄榄石形式存在,钼存在形式复杂,以氧化物为主,同时与铜渣中Si、Fe等之间形成化学键。若采用直接磁选回收铁,常规浮选回收钼,铁与钼均不能被有效回收。为使铜渣中的铁与钼资源可最大化回收再利用,以煤粉作还原剂,氧化钙与氧化铝作造渣剂,采用熔融直接还原工艺制备铁钼合金,从而一并回收铜渣中的铁和钼。探讨了还原温度、还原时间、煤粉用量、氧化钙用量、氧化铝用量等因素对Fe、Mo在合金中的回收率及品位的影响。结果表明在还原温度1400℃、还原时间60 min、煤粉用量、氧化钙用量、氧化铝用量分别是铜渣量的20%、20%、10%等优化条件下,Fe、Mo在合金中回收率分别为89.03%、98.44%,品位分别为91.70%、0.86%。
In a copper smelter in Hubei Province,the iron grade and molybdenum grade are 35.37%and 0.30%respectively.The iron mainly exists in the form of magnetite and forsterite,and the molybdenum mainly exists in the form of oxide,forming chemical bond with Si and Fe in the slag.If direct magnetic separation is used to recover iron and conventional flotation is used to recover molybdenum,neither iron nor molybdenum can be effectively recovered.In order to maximize the recovery and reuse of iron and molybdenum resources in copper slag,ferromolybdenum alloy was prepared by smelting direct reduction process with coal powder as reducing agent,calcium oxide and alumina as slag making agent,so as to recover iron and molybdenum from copper slag.The effects of reduction temperature,reduction time,amount of coal powder,amount of calcium oxide and amount of alumina on the recovery and grade of Fe and Mo in the alloy were discussed.The results showed that the recovery of Fe and Mo in the alloy is 89.03%and 98.44%respectively,and the grade is 91.70%and0.86%respectively under the optimized conditions of reduction temperature of 1400℃,reduction time of 60 min,coal powder consumption,calcium oxide consumption and alumina consumption respectively 20%,20%and 10%of copper slag.
作者
叶子青
黄自力
石家力
袁晨光
刘楚玉
朱超波
YE Ziqing;HUANG Zili;SHI Jiali;YUAN Chenguang;LIU Chuyu;ZHU Chaobo(Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2020年第11期106-112,共7页
Metal Mine
关键词
铜渣
直接还原
铁钼合金
copper slag
direct reduction
ferromolybdenum alloy
