还原熔炼法回收低品位锡中矿中锡资源
Recovery of tin resources from low-grade tin-bearing middling by reduction smelting process
徐志鹏 1刘振鸿 1李磊 1肖阳 1徐景壮 1雷云2
作者信息
- 1. 东华大学 环境科学与工程学院,上海 201620
- 2. 昆明理工大学 昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,云南 昆明 650093
- 折叠
摘要
本研究采用还原熔炼法回收低品位锡中矿中锡资源,并对氧化铜为添加剂时锡的回收行为进行了探究.结果表明一定条件下,提高熔炼温度、增加焦炭添加量、延长保温时间和增加氧化铜添加量可提高锡回收率;然而温度过高时,渣中铁氧化物被还原为金属铁,并与还原态金属锡发生合金化反应生成熔点较高的Fe-Sn合金,使其在渣金分离过程中易夹带在渣中造成锡损失;熔炼过程添加氧化铜时,其可通过还原反应生成金属铜,继而与金属锡发生合金化反应生成Cu-Sn合金,热力学上降低了产物Sn的活度,促进了锡的还原回收;在焦炭添加量7%、氧化铜添加量5.8%、熔炼温度1250℃、保温时间150 min条件下,锡回收率可达到95.24%,锡主要分布在Cu-Sn合金(分布比例 90.20%)和含锡烟尘(分布比例5.04%)中.本研究实现了低品位锡中矿中锡的高效回收.
Abstract
The recovery of tin from low-grade tin middling by reduction smelting method was studied,and the recovery behavior of tin was investigated when copper oxide was used as an additive.The results show that under a certain conditions,increasing the melting temperature,increasing the amount of coke addition,extending the holding time and increasing the amount of copper oxide addition can improve the recovery of tin,however,when the temperature is too high,iron oxide in the slag is reduced to metallic iron and alloyed with reduced metal tin to form Fe-Sn alloy,which has a high melting point and is easily entrapped in the slag during the separation of slag and metal resulting in the loss of tin.With copper oxide as an additive,it can generate metallic copper by reduction reaction and then alloy with metallic tin to form Cu-Sn alloy,which thermodynamically reduces the activity of Sn in the product and promotes the reduction and recovery of tin.Under the conditions of 7%coke addition,5.8%copper oxide addition,1 250℃melting temperature and 150 min holding time,the recovery of tin can reach 95.24%,and tin is distributed in copper-tin alloy(distribution ratio 90.20%)and tin containing dust(distribution ratio 5.04%),which realizes efficient recovery of tin from low-grade tin-bearing middling.
关键词
低品位锡中矿/锡回收/还原熔炼/铜锡合金/热力学分析/砷Key words
low-grade tin-bearing middling/tin recovery/reduction smelting/copper-tin alloy/thermodynamic analysis/arsenic引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据