无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2021, Vol. 53 ›› Issue (8): 75-78.doi: 10.19964/j.issn.1006-4990.2020-0533

• 工业技术 • 上一篇    下一篇

Li+、Na+、K+、SO42--H2O体系相图在MVR蒸发过程的应用研究

田海英(),周复,徐川,涂明江,钟兆资,廖仕英,李仕红   

  1. 天齐锂业股份有限公司,四川射洪 629200
  • 收稿日期:2020-09-28 出版日期:2021-08-10 发布日期:2021-08-11
  • 作者简介:田海英(1971— ),女,工程师,从事基础锂盐工艺研发及改进,磷酸铁锂电池回收的研究;E-mail: tianhy@tianqilithium.com

Application research of Li+,Na+,K+,SO42--H2O system phase diagram in MVR evaporation process

Tian Haiying(),Zhou Fu,Xu Chuan,Tu Mingjiang,Zhong Zhaozi,Liao Shiying,Li Shihong   

  1. Tianqi Lithium Industries.Inc,Shehong 629200,China
  • Received:2020-09-28 Online:2021-08-10 Published:2021-08-11

摘要:

工业上硫酸法矿石提锂生产碳酸锂的副产品是元明粉。为了解决元明粉生产环节MVR蒸发过程中出现的硫酸锂与硫酸钠共晶问题,采取了如下措施:首先,结合生产MVR流程实际取样数据,利用Li+、Na+、K+、SO42--H2O体系相图进行理论分析,利用火焰光度计、原子吸收分光光度计及XRD等化学分析手段,综合分析证明了元明粉MVR蒸发过程中硫酸锂与硫酸钠共晶复盐的存在。其次,结合MVR设备结构及生产工艺,提出了硫酸锂和硫酸钠共晶造成元明粉产品杂质锂含量超标问题的解决方法。

关键词: 硫酸钠, MVR结晶器, 硫酸锂, 共结晶

Abstract:

In industry,the by-product of extracting lithium from ore to produce lithium carbonate is the sodium sulfate pow-der.In order to solve the current problem of lithium sulfate and sodium sulfate eutectic during MVR evaporation,the following measures were taken:Firstly,combining with the actual sample data of MVR production process,the phase diagram of Li+,Na+,K+,SO42- -H2O system was theoretically analyzed,and the existence of lithium sulfate and sodium sulfate eutectic com-plex salts in the evaporation process of MVR was proved and comprehensively analyzed by chemical analyzed means of flame photometer,atomic absorption spectrophotometer and XRD.Secondly,combining with the MVR equipment structure and pro-duction process,a solution to the problem of excessive lithium impurities in sodium sulfate production caused by lithium sul-fate and sodium sulfate eutectic was put forward.

Key words: sodium sulfate, MVR crystallizer, lithium sulfate, cocrystallization

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