Nittetsu Mining Co., Ltd.

Sumitomo Corporation

Toyo Engineering Corporation

Masanobu Kawata

Kohei Mitsuhashi

Yutaka Yamaguchi

Atsushi Moriya

Ryo Kawarabuki

Akemitsu Iida

Keita Kamiyama

Norifumi Sakai

Hirohumi Tanaka

Yuji Tanimura

Youichi Yamamoto

The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.

Method for producing lithium carbonate

The present invention relates to a method for producing lithium carbonate, which is important as a raw material of a lithium ion battery and the like, from brine resources. More specifically, the invention relates to a method for producing lithium carbonate, in which carbon dioxide gas obtained by calcining limestone is introduced, in the presence of ammonia, into a concentrated brine, which is prepared from a lithium-containing brine as a raw material through an evaporative concentrating step, a desulfurizing step and an electrodialysis step, thereby depositing lithium carbonate crystals, and the crystals thus deposited are recovered through solid-liquid separation.

The present invention relates to a method for producing lithium carbonate, the method including: mixing ammonia and carbon dioxide gas (carbonate gas) with an aqueous solution containing lithium chloride to conduct a carbonation reaction; and thereafter, recovering a produced solid by solid-liquid separation, and also relates to a method for producing high purity lithium carbonate.

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Tokyo, Japan

Masanobu Kawata