锂精矿中可溶性杂质的脱除机理研究

Abstract

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（CO₃）₄Cl₂,but only NaCl dissolved at room tem-perature in washing process.Mg₂Na₆（CO₃）₄Cl₂ began to be dissolved at 40 ℃ and completely dissolved above 60 ℃.The con-version of Mg₂Na₆（CO₃）₄Cl₂ to Mg₅（CO₃）₄（OH）₂·4H₂O was enhanced by the increase of temperature.

Key words: lithium concentrate, lithium carbonate, soluble impurities

CLC Number:

TQ131.11

Hao Ziyang,Yuan Bo,Li Xin,Yi Meigui. Research on removal mechanism of soluble impurities in lithium concentrate[J]. Inorganic Chemicals Industry, 2019, 51(3): 49-52.

Figures/Tables 7

References 12

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Inorganic Acid-Base-Salt Committee of CIESC

Research on removal mechanism of soluble impurities in lithium concentrate

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