重结晶法脱除Li2CO3中硫酸盐的研究

Kihun Kim, Yeon-Chul Cho, In-Hwan Jang, Jae-Woo Ahn
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引用次数: 0

摘要

为了去除硫酸根(SO4 2-)和净化Li2CO3,采用蒸馏水和HCl溶液对粗Li2CO3进行了溶解和重结晶。当用蒸馏水溶解Li2CO3时,溶解Li2CO3的量(wt.%)随着溶液温度的降低而增加,在2.5℃时约为1.50 wt.%。此外,当加入Na2CO3并对Li2CO3溶液进行再结晶时,再结晶率(%)随着温度的升高而增加,在95℃时达到49.00 %。另一方面,当用HCl溶液溶解Li2CO3时,反应温度不受影响。随着HCl溶液浓度的增加,Li2CO3的溶解量(wt.%)增加,在2.0 M HCl溶液中,Li2CO3的溶解量为7.10 wt.%。加入Na2CO3对LiCl溶液进行再结晶,在70℃的反应温度下,LiCl溶液的再结晶率为86.10%,硫酸盐离子去除率达到96.50%以上。最后,通过水洗,重结晶Li2CO3粉末中Na的去除率达到99.10%以上,硫酸盐的去除率达到99.90%以上,可回收纯度为99.10%的Li2CO3。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study on the Removal of Sulfate in Li2CO3 by Recrystallization
In order to remove sulfate(SO4 2-) and purify the Li2CO3, dissolution and recrystallization of crude Li2CO3 using distilled water and HCl solution was performed. When Li2CO3 was dissolved using distilled water, the amount of dissolved Li2CO3(wt.%) increased as the solution temperature decrease and showed about 1.50 wt.% at 2.5°C. In addition, when Na2CO3 was added and the Li2CO3 solution was recrystallized, the recrystallization(%) increased with increasing temperature, resulting in a 49.00 % at 95 °C. On the other hand, when Li2CO3 was dissolved using HCl solution, there was no effect of reaction temperature. As the concentration of HCl solution increased, the amount of dissolved Li2CO3(wt.%) increased, indicating 7.10 wt.% in 2.0 M HCl solution. When the LiCl solution was recrystallized by adding Na2CO3, it exhibited a recrystallization(%) of 86.10 % at a reaction temperature of 70 °C, and showed a sulfate ion removal(%) of 96.50 % or more. Finally, more than 99.10 % of Na and more than 99.90 % of sulfate were removed from the recrystallized Li2CO3 powder through water washing, and purified Li2CO3 with a purity of 99.10 % could be recovered.
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