锂云母焙烧工艺节能优化与提锂溶液析盐控制
Energy-Saving Optimization of Lepidolite Roasting Process and Salt Precipitation Control of Lithium-Extracted Solution
朱智颖 1袁爱武 1仝一喆 1王恒辉1
作者信息
- 1. 长沙有色冶金设计研究院有限公司,湖南 长沙 410001
- 折叠
摘要
对锂云母提锂工艺过程与反应原理进行分析,并对锂云母提锂过程的两个关键工序(焙烧节能与湿法析盐)进行了热力学计算、能耗对比与相图分析.结果表明:普通隧道窑能耗略小于普通回转窑,从投资和换热效率方面综合考虑,热空气助燃的带篦冷机回转窑工艺为锂云母提锂的最佳硫酸盐焙烧工艺.浸出除杂液在0℃结晶能得到纯芒硝;在15～50℃区间内蒸发结晶能得到Na2SO4·3K2SO4 复盐,其中25℃时析出Na2SO4·3K2SO4 最多;在100℃下蒸发结晶只能得到含锂混盐.
Abstract
The process and reaction principle of lithium extraction from lepidolite were analyzed.Thermo-dynamic calculation,energy consumption comparison and phase diagram analysis were carried out for the two key steps of lithium extraction process from lepidolite,namely roasting energy saving and hydrometal-lurgical salt precipitation.The results show that the energy consumption of ordinary tunnel kilns is slightly lower than that of ordinary rotary kilns.Considering both investment and heat exchange efficiency,hot air combustion-assisted rotary kiln process with grate cooler is the best sulfate roasting process for lithium ex-traction from lepidolite.Pure mirabilite can be obtained by crystallization of purified leaching solution at 0℃.Na2SO4·3K2SO4 double salt can be obtained by evaporation crystallization at 15～50℃,and the pre-cipitated Na2SO4·3K2SO4 at 25℃is the most.Only lithium-containing mixed salt can be obtained by e-vaporation crystallization at 100℃.
关键词
锂云母/焙烧/能耗/浸出/热力学计算/水盐相图/析盐Key words
lepidolite/roasting/energy consumption/leaching/thermodynamic calculation/water-salt phase diagram/salt precipitation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据