Formation of Li Salts from Natural Brines during Isothermal Evaporation at 25℃

SONG Peng-sheng; DONG Ya-ping; LI Wu

Formation of Li Salts from Natural Brines during Isothermal Evaporation at 25℃

投稿时间：2019-03-18 修订日期：2019-04-11

DOI：10.12119/j.yhyj.201902001

中文关键词:

英文关键词:Li-brine Forrmation of Li salts Isothermal evaporation of brine Salt sequences from brine Thermodynamic model for Li⁺,Na⁺,K⁺,Mg²⁺/Cl-,SO2-₄-H₂O system

基金项目:

作者	单位
SONG Peng-sheng	Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China
DONG Ya-ping	Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China Qinghai Engineerning and Technology Research Center of Salt Lake Resources Development,Xining,810008,China
LI Wu	Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,810008,China 〖TPz

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中文摘要:

英文摘要:

Li brines are the primary resources for Li salt industries.Evaporation is necessary to concentrate Li due to its low level of concentration in raw brines.The salt sequences during the evaporation of Li brines,especially the behavior of Li salts,represent key data for solar technologies.However,chemists cannot use any phase diagram to estimate Li salt sequences during evaporation at 25℃.The thermodynamic model proposed by us in 2003 represents the only tool for the prediction of equilibrium conditions during the evaporation of solutions containing Li⁺,Na⁺,K⁺,Mg²⁺/Cl-,SO2-₄,and-H₂O components at 25℃.In this paper,the predicted salt sequences of 20 brines are reported.The results indicate that(1) the first crystallized Li salt during evaporation of Li brine varies in brine composition；(2) lithium sulfate is crystallized in many cases initially for brines of magnesium sulfate subtype,while Db4(Li₂SO₄·K₂SO₄) or Db3(2Li₂SO₄·Na₂SO₄·K₂SO₄) appears first for sodium sulfate and magnesium sulfate subtypes with lower Mg/Li composition,and the final eutectic point is H+LiC+Lc+Ls+Car；(3) the final eutectic point is H+LiC+Lc+Car for brines of chloride type；and(4) Li content corresponding to the first crystallized Li salt is in the range of 0.43%/1%.These findings enhance our knowledge of Li chemistry and provide insights into solar pond technology of the Li-brine process.

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