摘要
刚果(金)某地区经浮选得到的氧化铜精矿含铜28.39%,矿石中的铜主要赋存在孔雀石中。在实际生产中,采用鼓风炉还原熔炼处理该类氧化铜精矿,存在熔炼温度较高、氧化钙添加量大、熔炼渣含铜偏高的问题。为此,进行渣型优化实验研究,考察了还原焦比、CaO∶SiO2值大小和氧化亚铁加入量对氧化铜精矿还原熔炼的影响。结果表明,在还原熔炼时,焦比主要影响粗铜产率和铜回收率,CaO∶SiO2值大小主要影响渣中铜含量,熔炼温度是影响渣黏度的主要因素。推荐还原熔炼较优条件:还原焦比5%、酸性熔炼渣型、渣中CaO∶SiO2值为0.4~0.55、FeO∶SiO2为0.13,在此条件下,渣含铜可降至0.4%以下,铜回收率在98%以上。
The copper oxide concentrate obtained by flotation in Congo(DRC)contains 28.39%copper,and the copper in the ore mainly occurs in malachite.In the actual production,the blast furnace reduction smelting is used to treat this kind of copper oxide concentrate,which has the problems of high smelting temperature,large amount of calcium oxide dosage and high copper content in the smelting slag.Therefore,the slag type optimization tests are carried out,and the effects of reducing coke ratio,CaO∶SiO2 ratio and the amount of ferrous oxide added on the reduction smelting of copper oxide concentrate are investigated.The results show that the coke ratio mainly affects the yield and recovery of crude copper,CaO∶SiO2 mainly affects the content of copper in slag,and melting temperature is the main factor affecting the viscosity of slag.Under the condition of reducing coke ratio of 5%,selecting acid smelting slag type,CaO∶SiO2 in the slag of 0.4-0.55 and FeO∶SiO2 of 0.13,the copper content in the slag can be reduced to less than 0.4%,and the copper recovery rate is more than 98%.
作者
苏凤来
张登高
郑朝振
SU Feng-lai;ZHANG Deng-gao;ZHENG Chao-zhen(Zijin Mining Group COMMUS SAS Kolowezi,Lubumbashi,Democratic Republic of Congo;BGRIMM Technology Group,Beijing 100160,China;School of Metallurgical and Ecological Engineering,University of Science&Technology Beijing,Beijing 100083,China)
出处
《矿冶》
CAS
2020年第6期51-55,73,共6页
Mining And Metallurgy
基金
国家重点研发计划项目(2018YFC1900303)。
关键词
氧化铜精矿
还原熔炼
渣型优化
实验
copper oxide concentrate
reduction smelting
slag optimization
tests
