铜渣熔融还原回收铁试验研究

Experimental Study on Iron Recovery from Copper Slag by Smelting Reduction

以铜浮选尾渣为原料,采用直接熔融还原—磁选的方法回收铁,探讨了在焙烧温度为1 350℃时,碳粉、氧化钙用量及焙烧恒温时间对还原渣磁选过程铁回收率与铁精矿品位的影响。结果表明,在碳粉和氧化钙添加量分别为铜渣质量的32%和10%、恒温100min的条件下对浮选尾渣进行熔融还原,焙烧后的产物破碎磨细至-0.074mm占85%,再进行弱磁选,可获得铁品位为67.47%的还原铁精矿,铁回收率为92.32%。

Iron was recovered from copper flotation tailings by direct smelting reduction and magnetic separation.Effects of dosage of carbon powder and calcium oxide,and roasting time on iron recovery and iron concentrate in magnetic separation of reduced slag at roasting temperature of 1 350℃were discussed.The results show that copper flotation tailings are smelting reduced under the conditions including dosage of carbon powder and calcium oxide of 32%and 10%mass fraction of copper slag,and roasting time of 100 min.Reduced iron concentrate with iron grade of 67.47%and iron recovery of 92.32%is obtained from calcine with particle size of 85%of-0.074 mm by magnetic separation.