Na2CO3-Na2SO4复盐熔炼法从碱溶渣中高效分离钨的工艺研究
Process study on efficient separation of tungsten from alkali molten slag by Na2CO3-Na2SO4 compound salt melting
冯浩 1郭学益 2许开华 3于大伟 2黄健 3何鑫涛3
作者信息
- 1. 中南大学 冶金与环境学院,长沙 410083;荆门市格林美新材料有限公司,荆门 448000
- 2. 中南大学 冶金与环境学院,长沙 410083
- 3. 荆门市格林美新材料有限公司,荆门 448000
- 折叠
摘要
钨合金废料资源化利用过程中容易产生含钨碱溶渣,且该部分含钨碱溶渣中钨品位较高.本文开发了一种复盐(Na2CO3-Na2SO4)熔炼工艺,以对含钨碱溶渣中的钨进行高效分离;探究Na2CO3和Na2SO4的添加量、复盐熔炼温度、熔炼时间以及水浸液固比、水浸温度对钨回收率的影响.结果表明:从含钨碱溶渣中高效分离钨的最优条件为n(W)∶n(Na2CO3)∶n(Na2SO4)=1∶1.25∶0.54,复盐熔炼温度为800℃,熔炼时间为3 h,水浸液固比为2.5,水浸温度为75℃,在该最优条件下可将含钨碱溶渣中99.93%的钨分离出来.同时,本文通过XRD分析以及热力学分析对复盐熔炼的反应机理进行了探讨,复盐体系的构建有助于降低体系共熔点,降低能耗,同时有助于促进碱溶渣与反应介质的充分接触,提高反应效率.
Abstract
The resource utilization of tungsten alloy waste is prone to produce tungsten-containing alkaline residue,and the tungsten content in this part of tungsten-containing alkaline residue is high.In this paper,a compound salt(Na2CO3-Na2SO4)melting process was developed for the efficient separation of tungsten.The effects of the addition amount of Na2CO3 and Na2SO4,the melting temperature of the compound salt,the melting time as well as the water leaching liquid-solid ratio and the water leaching temperature on the recovery of tungsten were investigated.The results show that the optimal conditions of separating tungsten from alkali molten slag are n(W)∶n(Na2CO3)∶n(Na2SO4)=1∶1.25∶0.54,the melting temperature of the compound salt is 800℃,the melting time is 3 h,the water leaching liquid-solid ratio is 2.5,the water leaching temperature is 75℃,and 99.93%of the tungsten metal in the tungsten-bearing alkali residue can be optimally separated out.Meanwhile,the reaction mechanism of compound salt melting was discussed in this paper based on XRD analysis and thermodynamic analysis.The construction of compound salt system helps to reduce the eutectic point of the system save energy consumption,and also helps to promote the full contact between alkali-soluble slag and reaction medium to improve the reaction efficiency.
关键词
钨合金废料/含钨碱溶渣/复盐熔炼/热力学Key words
tungsten alloy scrap/alkali leach residue containing tungsten/compound salt melting/thermodynamics引用本文复制引用
基金项目
国家重点研发计划(2019YFC1907401)
荆门市科技计划(2019YFZD036)
出版年
2024
NETL
NSTL
万方数据