反射炉炼铜渣综合利用技术研究

在铜熔炼反射炉渣中铜铁赋存状态分析基础上,采用火法贫化和磁选技术对炉渣进行综合利用探索。此反射炉渣含1.06%Cu和36.41%Fe,其中32.5%的Fe以Fe3O4形式存在,53.5%的Fe以2FeO.S iO2形式存在,铜、铁、硅矿物紧密共生,相互交织。研究结果表明,转炉渣返回贫化作业会导致反射炉渣含铜较高,添加一定量黄铁矿精矿,采用火法贫化工艺能有效降低渣含铜。将贫化后铜渣脱硅缓冷、磁选,所得铁精矿品位62%,回收率达70.2%,实现了反射炉熔炼渣的综合利用,可用作炼铁原料。

A Study on Comprehensive Utilization of Copper Smelting Slags from Reverberator

Based on the analysis of Copper and Iron occurrence status in copper reverberatory smelting slag,comprehensive utilization of the slag was investigated as a process of combined technology of pyrometallurgical cleaning and magnetic separation technology.Slag from Reverberatory furnace contains 1.06% Cu and 36.41% Fe.32.5% of total iron amount is present as magnetite and 53.5% as fayalite(2FeO·SiO2).The slag consists of an intergrowth of copper,iron,and silicon minerals.The results show that when molten converter slag is recycled for cleaning,excessive magnetite will lead to increase the amount of copper lost in reverberatory slag.Pyrite concentrates may be added to decreasing copper loss in slag.When lime is added to hot cleaned copper slag,slow-cooling/solidification,crushing/grinding and magnetic separation,the produced magnetite concentrates with iron grade of 62% Fe and iron recovery of 71.2% are achieved.The developed combining technology can be carried out to comprehensively utilize copper slag and produce magnetite concentrate for iron-making industry.