Inorganic Chemicals Industry ›› 2020, Vol. 52 ›› Issue (3): 80-84.doi: 10.11962/1006-4990.2019-0221

• Environment·Health·Safety • Previous Articles     Next Articles

Preparation of battery-grade lithium carbonate from lithium-containing industrial waste

Hu Min,Gong Hanzhang,Wu Huadong,Guo Jia,Zhang Linfeng,Zhou Yuxin   

  1. Key Laboratory for Green Chemical Process of Ministry of Education,Wuhan Institute of Technology,Wuhan 430073,China
  • Received:2019-09-22 Online:2020-03-10 Published:2020-03-31

Abstract:

The market demand for battery-grade lithium carbonate is increasing with the rapid development of the battery industry.The lithium-containing industrial waste from a company was used as raw material,and it was purified by carbonization decomposition method,and the filtrate filter cake cycle was repeated,and finally the battery-grade lithium carbonate meeting the requirement of the industry standard was obtained.The reaction conditions of the carbonization process was as follows:the solid-liquid mass-volume ratio was 1:50,the stirring speed was 300 r/min,the CO2 flow rate was 10 L/min,the reaction tem-perature was 20 ℃ and the reaction time was 60 min.The reaction conditions of the thermal decomposition process was as follows: the stirring speed was 300 r/min,the reaction temperature was 95 ℃ and the reaction time was 60 min.After a five-stage filtrate cake cycle for the Li2CO3 obtained by the carbonization-and decomposition-processes,the final purified Li2CO3 product can fully meets the requirement of battery-grade lithium carbonate industry standard.The content of Li2CO3 in the product was 99.71%,the mass fractions of Mg,Ca and K were reduced to 0.005 3%,0.005 0% and 0.000 9%,respectively.The yield was maintained above 55%,and the product had a rod shape,uniform size and good dispersion.

Key words: battery-grade lithium carbonate, carbonization reaction, thermal decomposition reaction, purification

CLC Number: