焙烧铜渣中磁铁矿的物性转变研究

为探究熔融状态下，焙烧铜渣中磁铁矿的物性转变，对铜渣进行了CO/CO₂气氛下熔融氧化焙烧实验。考察了CaO添加量与焙烧温度对于渣中Fe₂SiO₄向Fe₃O₄转变过程和Fe₃O₄迁移并富集的影响。CaO的添加促进了渣中Fe₂SiO₄向Fe₃O₄转变和Fe₃O₄迁移富集，而选择适宜的焙烧温度才能最大程度让Fe₃O₄迁移富集。最后发现在CaO添加量为铜渣质量的25 %，焙烧温度1 300 ℃，保温时间2 h，CO₂和CO体积比为190:10的条件下焙烧铜渣，铜渣中的Fe₂SiO₄基本完成了向Fe₃O₄转化，且Fe₃O₄迁移与富集程度较好。 

Study on the physical property transformation of magnetite in roasted copper slag

In order to explore the physical properties of magnetite in the roasted copper slag in the molten state, a melt oxidation roasting experiment was conducted on the copper slag in a CO/CO₂ atmosphere. The effects were investigated of CaO addition and calcination temperature on the transition process of Fe₂SiO₄ to Fe₃O₄ in the slag, and the migration and enrichment of Fe₃O₄. The addition of CaO promotes the conversion of Fe₂SiO₄ to Fe₃O₄ in the slag and the migration and enrichment of Fe₃O₄, and the properly selected roasting temperature can maximize the migration and enrichment of Fe₃O₄. Finally, it was found that the addition of CaO was 25 % of the mass of the copper slag, the calcination temperature was 1 300 ℃, the holding time was 2 h, and the volume of CO₂ and CO was 190:10. The Fe₂SiO₄ in the copper slag had basically completed the conversion to Fe₃O₄ and its migration and enrichment degree was better.