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, *
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.
Lithium carbonate (Li2CO3); Causticization; In situ ion-exchange; Dissolution–precipitation