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 ›› 2019, Vol. 51 ›› Issue (3): 49-52.

• 研究与开发 • 上一篇    下一篇

锂精矿中可溶性杂质的脱除机理研究

蒿紫阳,袁波,李芯,易美桂   

  1. 四川大学化学工程学院,四川成都 610065
  • 收稿日期:2018-09-22 出版日期:2019-03-10 发布日期:2020-05-09
  • 作者简介:蒿紫阳(1992— ),女,在读硕士,研究方向为传质与分离;E-mail: 2465533918@qq.com。

Research on removal mechanism of soluble impurities in lithium concentrate

Hao Ziyang,Yuan Bo,Li Xin,Yi Meigui   

  1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China
  • Received:2018-09-22 Published:2019-03-10 Online:2020-05-09

摘要:

以中国某盐湖的锂精矿为原料,研究了水洗法脱除锂精矿中可溶性杂质的规律及机理。主要探索了水洗温度对可溶性杂质脱除的影响,结合扫描电镜(SEM)、X射线衍射(XRD)和能谱仪(EDS)等表征方法,研究了可溶性杂质的赋存形式及物相转化规律。结果表明:在液固质量比为3:1、水洗温度为60 ℃、水洗时间为4 h条件下,可将锂精矿中的钠、钾、氯质量分数分别降低至2.5%、0.35%、2.65%。锂精矿中的可溶性杂质主要以氯化钠(NaCl)和复盐氯碳酸钠镁石[Mg2Na6(CO34Cl2]两种物相存在。常温下水洗仅可溶解氯化钠,而复盐氯碳酸钠镁石几乎不溶。复盐氯碳酸钠镁石在40 ℃开始溶解,60 ℃及以上完全溶解。水洗过程中发生了复盐氯碳酸钠镁石向碱式碳酸镁的转变反应,且升高温度有利于该反应的正向进行。

关键词: 锂精矿, 碳酸锂, 可溶性杂质

Abstract:

Taking lithium concentrate from a salt lake in China as raw material,the rule and mechanism of removing soluble impurities in lithium concentrate by water washing method were studied.The influence of water washing temperature on the removal of soluble impurities was mainly explored. Combining with scanning electron microscope(SEM),X-ray diffraction(XRD) and energy spectrometer(EDS),and other characterization methods,the occurrence form and the law of phase trans-formation of soluble impurities were studied.The experimental results showed that under the conditions of liquid solid ratio of 3:1,temperature of 60 ℃,and water washing time 4 h,the mass fractions of Na,K,Cl could be reduced to 2.5%,0.35% and 2.65% respectively.Soluble impurities mainly existed as NaCl and Mg2Na6(CO34Cl2,but only NaCl dissolved at room tem-perature in washing process.Mg2Na6(CO34Cl2 began to be dissolved at 40 ℃ and completely dissolved above 60 ℃.The con-version of Mg2Na6(CO34Cl2 to Mg5(CO34(OH)2·4H2O was enhanced by the increase of temperature.

Key words: lithium concentrate, lithium carbonate, soluble impurities

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