铜渣贫化的选择性还原过程

Research on Selective Reducing Impoverishment Process of Copper Slag

借助于金相分析、SEM和EDX等方法,研究炼铜炉渣加炭粉、通惰性气体搅拌选择性还原贫化过程。结果表明,通过选择性贫化过程,渣中残余铜含量可由5％降低到0．35％以下。随气体搅动时间延长,渣中Fe3O4含量降低,二价铁含量增加,有效地降低了渣黏度．促进冰铜滴沉降。在还原过程中,渣中Fe3O4含量逐渐降低,渣中主要存在的相组成为残余磁性氧化铁、(FeO)2·SiO2及FeO·CaO·SiO2的连续固溶体。每1kg铜渣配人17g炭粉既可满足还原反应要求。

The selective reduction impoverishment of slag from copper smelting with addition of charcoal powder and stirring of inert gas is investigated by the aid of metallurgical analysis, SEM and EDX. The results show that the copper content in the slag can be reduced from 5 % to 0.35 % by the selective reduction impoverishment process. The contents of Fe3O4 and Fe（II） in molten slag are decreased and increased with the prolong of the inert gas stirring time, respectively. Therefore the viscosity of the slag is effectively reduced, and the settling rate of the matte drops is accelerated. In the reduction process, the remaining Fe304 is gradually decreased, and the main phase composition is the molten body consisted of Fe3O4, （FeO）2·SiO2 and FeO·CaO·SiO2. The dosage of 17g charcoal powder for 1kg slag could meet the requirement of the impoverishment reaction.