生物质还原贫化铜熔渣试验研究
Experimental study ondilution of copper slag by biomass reduction
甘文1
作者信息
- 1. 低品位难处理黄金资源综合利用国家重点实验室,福建厦门 364202;厦门紫金矿冶技术有限公司,福建厦门 361101
- 折叠
摘要
铜渣火法贫化技术的实质是在高温铜渣中加入硫铁矿或碳质还原剂,使渣中的磁性铁还原成FeO,铜则以铜锍的形式聚集,最终实现铜从渣相中分离.生物质作为一种可再生资源,是碳质还原剂的优选物料,本研究以铁硅橄榄石型熔渣为原料,通过单因素条件实验,对比了生物质和煤粉分别还原铜渣的效果,并考察了生物质配比、氧化钙配比、二氧化硅配比、还原温度、还原时间等不同冶炼条件对渣中铜回收率的影响.结果表明,在还原温度1 310 ℃、保温时间120 min、生物质配比1％、氧化钙配比0.5％、二氧化硅配比0.5％、硫铁矿配比1％的较优试验条件下,渣上层铜含量从1.49％降低至0.42％,达到了煤粉直接还原贫化铜渣的效果.从环境效益角度分析,生物质较煤粉更适合作为铜渣贫化的碳质还原剂.
Abstract
The essence of copper slag pyrometallurgical dilution technology is to add pyrite or carbonaceous reducing agent to high-temperature copper slag,so that the magnetic iron in the slag is reduced to FeO,and copper is gathered in the form of copper matte,and finally copper is separated from the slag phase.As a renewable resource,biomass is the preferred material for carbonaceous reductants.In this study,the iron silicon olivine slag was used as raw material,and the effects of biomass and pulverized coal on the reduction of copper slag were compared by single factor condition experiment.The effects of different smelting conditions such as biomass ratio,calcium oxide ratio,silica ratio,reduction temperature and reduction time on the recovery rate of copper in slag were investigated.The results show that under the optimal experimental conditions of reduction temperature of 1 310 ℃,holding time of 120 min,biomass ratio of 1％,calcium oxide ratio of 0.5％,silica ratio of 0.5％,and pyrite ratio of 1％,the copper content in the upper layer of the slag is reduced from 1.49％to 0.42％,which achieves the effect of direct reduction of copper slag by pulverized coal.From the perspective of environmental benefits,biomass is more suitable as a carbonaceous reducing agent for copper slag dilution than pulverized coal.
关键词
铜熔渣/还原贫化/碳质还原剂/铜回收/生物质/煤粉/添加剂Key words
copper slag/deductive dilution/carbonaceous reducing agent/copper recovery/biomass/pulverized coal/additive引用本文复制引用
出版年
2024
NETL
NSTL
万方数据