Abstract
Investigations were conducted to purify crude Li 2 CO 3 via direct carbonation with CO 2 at atmospheric pressure and pyrolysis with both water bath heating method and microwave heating method. The reaction kinetics of LiHCO 3 pyrolysis was studied and the effect of different operating conditions including initial concentration of LiHCO 3 solution, pyrolysis temperature and stirring speed on the purity of Li 2 CO 3 was investigated to obtain the optimal operating conditions. Results showed that the effect law is similar in the two pyrolysis processes. The purity of the Li 2 CO 3 increases firstly and then decreases with the increase of the initial concentration of LiHCO 3 solution and the stirring speed, while the purity of Li 2 CO 3 first decreases and then increases with the increase of pyrolysis temperature. The product yield increases with the increase of initial concentration of LiHCO 3 solution and pyrolysis temperature and is essentially unaffected by the stirring speed. Under the optimal operating conditions, the purity of Li 2 CO 3 can reach up to 99.86% and 99.81% in water bath heating and microwave heating process, respectively. In addition, the pyrolysis rate of microwave assisted pyrolysis is 6 times that of water bath heating process, indicating that the microwave heating technology can significantly improve pyrolysis efficiency and reduce energy consumption.
Published Version
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