沉锂反应条件对碳酸锂纯度及杂质影响的研究

Abstract

Abstract:

Lithium rich brines from Qinghai Salt Lake Fozhao Lanke Lithium Co.,Ltd.were used as raw materials to react with sodium carbonate solution to study the lithium deposition process.The phenomenon of peritectic precipitation was likely to occur during the lithium precipitation process,meant that sodium chloride and sodium carbonate crystallites encapsulated in lithium carbonate crystals during the production process.The purity of lithium carbonate products,and the contents of impurities,such as sodium,magnesium,chlorine and boron,were detected.The morphology and particle size of products were characterized.The influences of reaction temperature,the concentration of sodium carbonate,the feeding method,the stirring rate,and the amount of sodium carbonate on the purity and impurities of lithium carbonate and on the peritectic phenomena were investigated.The relationship between the reaction conditions and the peritectic phenomenon was explored,providing a theoretical basis for the production of battery grade lithium carbonate.

Key words: lithium carbonate, salt-lake brine, lithium deposition, peritectic

CLC Number:

TQ131.11

Yin Jishuai,Sun Wenliang,Hao Rusi,Wang Xiao. Study on the influence of lithium deposition reaction conditions on purity and impurities of lithium carbonate[J]. Inorganic Chemicals Industry, 2019, 51(3): 29-33.

Figures/Tables 9

References 8

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温度/ ℃	w（Li₂CO₃）/ %	w（Na）/ %	w（Cl）/ %	w（Mg）/ %	w（B）/ %
60	99.35	0.012 5	0.009 2	0.004 8	0.031 0
70	99.46	0.010 9	0.008 0	0.005 1	0.030 5
80	99.52	0.008 9	0.008 5	0.003 6	0.030 8
90	99.50	0.009 2	0.009 0	0.003 5	0.032 0

ρ（碳酸钠）/（g·L^-1）	w（Li₂CO₃）/ %	w（Na）/ %	w（Cl）/ %	w（Mg）/ %	w（B）/ %
100	99.02	0.008 5	0.008 4	0.002 3	0.028 8
150	99.19	0.007 8	0.008 7	0.002 0	0.030 8
200	99.35	0.007 5	0.007 6	0.002 2	0.028 1
250	99.56	0.006 8	0.007 5	0.002 5	0.030 3
300	99.52	0.007 0	0.010 8	0.001 9	0.033 0

加料方式	w（Li₂CO₃）/ %	w（Na）/ %	w（Cl）/ %	w（Mg）/ %	w（B）/ %
正向加料	99.52	0.008 0	0.008 3	0.003 0	0.031 0
反向加料	99.53	0.008 0	0.008 0	0.002 6	0.029 5
同时加料	99.32	0.010 5	0.008 8	0.002 8	0.030 8
一次加料	99.34	0.012 0	0.009 5	0.002 2	0.032 0

搅拌转速/ （r·min^-1）	w（Li₂CO₃）/ %	w（Na）/ %	w（Cl）/ %	w（Mg）/ %	w（B）/ %
200	99.43	0.007 8	0.008 5	0.003 4	0.031 0
300	99.45	0.008 2	0.007 7	0.002 5	0.030 5
400	99.56	0.008 0	0.007 9	0.002 8	0.028 5
500	99.54	0.009 2	0.009 2	0.003 2	0.029 5
600	99.32	0.010 2	0.010 1	0.004 6	0.031 2

碳酸钠加入量/%	w（Li₂CO₃）/ %	w（Na）/ %	w（Cl）/ %	w（Mg）/ %	w（B）/ %
80	99.56	0.008 2	0.007 0	0.003 8	0.031 0
90	99.55	0.007 9	0.007 5	0.003 5	0.029 7
100	99.52	0.007 6	0.006 8	0.004 0	0.030 5
110	99.54	0.007 4	0.006 5	0.003 8	0.030 2
120	99.52	0.008 0	0.008 5	0.004 0	0.030 8

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on the influence of lithium deposition reaction conditions on purity and impurities of lithium carbonate

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