碳酸锂在水和NaCl-KCl溶液体系中溶解度的在线测定
收稿日期: 2020-08-19
网络出版日期: 2021-07-13
Online determination of the solubility of lithium carbonate in water and NaCl-KCl solution system
Received date: 2020-08-19
Online published: 2021-07-13
碳酸锂溶解度在工业结晶生产中是十分重要的基础数据。采用浸入式红外探头和拉曼探头在线监测溶液体系中CO32-和碳酸锂的特征峰峰强的变化,依据Lambert-Beer定律得出溶液体系中实时在线测定碳酸锂的溶解度。通过在线测定,测得碳酸锂在氯化钠-氯化钾溶液（cNaCl=0.446 6 mol/L,cKCl=0.015 8 mol/L）中的溶解度高于在水中的溶解度值。实验测试出的水中碳酸锂的溶解度数据还能与Van′t Hoff方程较好地关联,进一步测算碳酸锂在其他温度下水中的溶解度值。此外,该方法测定的碳酸锂在水中的溶解度数据比文献值中采用重量分析法测试出的溶解度数据偏小,是因为测试装置不同造成的。
王斌 , 邓小川 , 史一飞 , 董超超 , 樊发英 , 朱朝梁 , 樊洁 . 碳酸锂在水和NaCl-KCl溶液体系中溶解度的在线测定[J]. 无机盐工业, 2021 , 53(7) : 73 -79 . DOI: 10.19964/j.issn.1006-4990.2020-0473
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 CO32- 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（cNaCl=0.446 6 mol/L,cKCl=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
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