碳酸锂在水和NaCl-KCl溶液体系中溶解度的在线测定

doi:10.19964/j.issn.1006-4990.2020-0473

Abstract

Abstract:

The solubility of lithium carbonate is a very important basic data in industrial crystal production.An immersion in-frared probe and a Raman probe were used to test the changes in the characteristic peaks of CO₃^2- and Li₂CO₃ in the solution system online.Based on Lambert-Beer′s law,the solubility of lithium carbonate was determined online in real time in the solu-tion system.By online monitoring,the solubility of lithium carbonate in the NaCl-KCl solution（c_NaCl=0.446 6 mol/L,c_KCl=0.015 8 mol/L） was measured higher than the solubility value in water.In this experiment,the solubility data in water could be well correlated with the Van′t Hoff equation,which could calculate the solubility of lithium carbonate in water at other tem-perature.Moreover,the solubility data of lithium carbonate in water determined by this method was smaller than the solubility data measured by gravimetric analysis method in the literature,which was caused by the different test equipment.

Key words: lithium carbonate, solubility, online monitoring, infrared, Raman

CLC Number:

TQ131.11

Wang Bin,Deng Xiaochuan,Shi Yifei,Dong Chaochao,Fan Faying,Zhu Chaoliang,Fan Jie. Online determination of the solubility of lithium carbonate in water and NaCl-KCl solution system[J]. Inorganic Chemicals Industry, 2021, 53(7): 73-79.

Figures/Tables 10

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References 20

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T/K	溶解度/ g	x/ 10^-3	R²（IR）	R² （Raman）	x^c/ 10^-3	100RD
293.15	1.316 0	3.195 6	0.999 6	0.999 4	3.229 5	1.060 8
303.15	1.193 0	2.897 8	0.999 7	0.999 4	3.035 8	4.762 2
313.15	1.092 0	2.653 1	0.999 8	0.999 4	2.842 1	7.123 7
323.15	0.998 0	2.425 9	0.999 6	0.999 5	2.624 0	8.166 0
333.15	0.898 0	2.182 8	0.999 9	0.999 6	2.454 4	12.44 3
343.15	0.816 0	1.983 3	0.999 7	0.999 5	—	—
353.15	0.721 0	1.753 3	0.999 8	0.999 5	2.066 4	17.85 8
363.15	0.660 0	1.605 2	0.999 5	0.999 3	1.896 5	18.14 7

T/K	水 x/10^-3	NaCl-KCl 溶液 x/10^-3
293.15	3.195 6	3.602 2
303.15	2.897 8	3.258 3
313.15	2.653 1	2.984 4
323.15	2.425 9	2.779 1
333.15	2.182 8	2.553 8
343.15	1.983 3	2.345 3
353.15	1.753 3	2.112 5
363.15	1.605 2	2.025 1

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Inorganic Acid-Base-Salt Committee of CIESC

Online determination of the solubility of lithium carbonate in water and NaCl-KCl solution system

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