生物质炭深度还原铜熔渣的特性

Strengthen recovery characteristics of copper smelting slag with biochar

研究以生物质炭为还原剂,直接熔融深度还原铜熔渣中的有价金属的过程。对比分析生物质炭与煤粉在铜熔渣熔池熔炼还原过程的还原特性,探讨研究熔池温度、生物质炭添加量、反应时间等影响因素对熔渣中有价金属铁的价态改变及迁移规律的影响机制。研究结果表明:生物质炭能够有效替代传统煤质还原剂,实现铜熔渣的深度还原。在生物质炭含碳与铜熔渣全铁的物质的量比为1.375:1,反应温度为1 300℃时,金属铁的还原率可达95%以上,铜的还原率达到98%以上,生物质炭的利用率为90%。

The process of reducing the valuable metal was studied in smelting copper slag by direct reduction of biochar.The reduction characteristics of biochar and pulverized coal were analyzed acting on smelting copper slag.Some influence factors were studied on the change mechanism of iron valence and the influence mechanism of valuable metal iron in slag,such as the reaction temperature,the carbon/slag mass-ratio and the reaction time.The results show that the biochar can effectively replace coal as the reducing agent to achieve the depth reduction of copper slag.When the mole ratio of the biochar to the iron element of the copper slag is 1.375:1 at the reaction temperature of 1 300℃,the metallization rate of iron and copper can achieve over 95%and 98%respectively,and the utilization rate of biochar is 90%.