Volume 34
您当前的位置:首页 > 期刊文章 > 过刊浏览 > Volumes 30-35 (2017) > Volume 34
Yuan, B., Wang, J., Cai, W., Yang, Y., Yi, M., & Xiang, L. (2017). Effects of temperature on conversion of Li2CO3 to LiOH in Ca(OH)2 suspension. Particuology, 34, 97-102. https://doi.org/10.1016/j.partic.2017.01.005
Effects of temperature on conversion of Li2CO3 to LiOH in Ca(OH)2 suspension
Bo Yuan a b, Jing Wang b, Wei Cai a b, Yurong Yang a b, Meigui Yi a *, Lan Xiang b *
a College of Chemical Engineering, Sichuan University, Chengdu 610065, China
b Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
10.1016/j.partic.2017.01.005
Volume 34, October 2017, Pages 97-102
Received 2 December 2016, Revised 16 January 2017, Accepted 22 January 2017, Available online 23 June 2017, Version of Record 12 August 2017.
E-mail: meiguiyi@scu.edu.cn; xianglan@mail.tsinghua.edu.cn

Highlights

• The conversion of Li2CO3 to LiOH at difference temperatures was studied.

• The in-situ ion-exchange and dissolution-precipitation mechanism co-existed.

• The in-situ ion-exchange route dominated at lower temperature.

• Increase of temperature accelerated the dissolution and conversion of Li2CO3 to LiOH.


Abstract

The effects of temperature on the conversion of Li2CO3 to LiOH in a Ca(OH)2 suspension were investigated. Li2CO3 microplates were used as the Li source. The results showed that Li2CO3 was converted to LiOH via in situ ion-exchange and dissolution–precipitation routes. The formation of mixed CaxLi2−2xCO3 intermediate species confirmed that at 25 °C needle-like CaCO3 was formed heterogeneously on the Li2CO3 surface via in situ ion-exchange. At 60–100 °C, isolated CaCO3 agglomerates were formed homogeneously via dissolution–precipitation. Temperature increases accelerated the dissolution and conversion of Li2CO3 to LiOH, producing solutions with high [CO32−]/[Ca2+] ratios; this favored homogeneous precipitation of isolated CaCO3 agglomerates.

Graphical abstract
Keywords
Lithium carbonate (Li2CO3); CausticizationIn situ ion-exchange; Dissolution–precipitation