在线阅读

在线阅读

Partic. vol. 34 pp. 97-102 (October 2017)
doi: 10.1016/j.partic.2017.01.005

Effects of temperature on conversion of Li2CO3 to LiOH in Ca(OH)2 suspension

Bo Yuana, b, Jing Wangb, Wei Caia, b, Yurong Yanga, b, Meigui Yia, *, Lan Xiangb, *

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meiguiyi@scu.edu.cnxianglan@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); Causticization; In situ ion-exchange; Dissolution–precipitation