The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2016
Filed:
Nov. 29, 2012
Masanobu Kawata, Tokyo, JP;
Hirohumi Tanaka, Tokyo, JP;
Kohei Mitsuhashi, Tokyo, JP;
Ryo Kawarabuki, Tokyo, JP;
Youichi Yamamoto, Chiba, JP;
Keita Kamiyama, Chiba, JP;
Atsushi Moriya, Chiba, JP;
Norifumi Sakai, Chiba, JP;
Masanobu Kawata, Tokyo, JP;
Hirohumi Tanaka, Tokyo, JP;
Kohei Mitsuhashi, Tokyo, JP;
Ryo Kawarabuki, Tokyo, JP;
Youichi Yamamoto, Chiba, JP;
Keita Kamiyama, Chiba, JP;
Atsushi Moriya, Chiba, JP;
Norifumi Sakai, Chiba, JP;
NITTETSU MINING CO., LTD., Tokyo, JP;
TOYO ENGINEERING CORPORATION, Chiba, JP;
SUMITOMO CORPORATION, Tokyo, JP;
Abstract
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.