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公开(公告)号：US20240317604A1
公开(公告)日：2024-09-26
申请号：US18578923
申请日：2022-07-07
Applicant: TODA KOGYO CORP.
Inventor： Tomohiro HONDA , Anyu ZHANG , Masayuki YOKOTA , Nobuyuki TAGAMI
Abstract: The present invention is to provide a process for removing magnesium contained as an impurity from nickel sulfate and producing high-purity nickel sulfate.
The process for producing an aqueous nickel sulfate solution from which magnesium is removed from nickel sulfate, comprises the following steps (1) to (3):
(1) a carbonation step obtaining a slurry comprising nickel carbonate as a solid content by mixing a nickel sulfate aqueous solution and lithium carbonate,
(2) a solid-liquid separation step of separating the slurry obtained in the carbonation step into a solid content and liquid component, and
(3) a dissolution step dissolving the solid content obtained in said solid-liquid separation step with a solution containing sulfuric acid.-
公开(公告)号：US20240286912A1
公开(公告)日：2024-08-29
申请号：US18578865
申请日：2022-07-07
Applicant: TODA KOGYO CORP.
Inventor： Tomohiro HONDA , Anyu ZHANG , Masayuki YOKOTA , Nobuyuki TAGAMI
Abstract: The present invention is to provide a means for efficiently and economically separating and recovering transition metals including nickel and cobalt, and lithium from an aqueous sulfate solution comprising the transition metal and lithium as major components.
The present invention is a process for producing lithium sulfate comprising:
a step of concentration-crystallization to an aqueous solution comprising at least lithium sulfate and a transition metal sulfate as main components so as to obtain a slurry comprising lithium sulfate as a solid content, and
a step of solid-liquid separation of the slurry obtained in the step of concentration-crystallization so as to separate lithium crystals and a crystallization mother liquor.-
公开(公告)号：US20240240330A1
公开(公告)日：2024-07-18
申请号：US18562214
申请日：2023-01-05
Applicant: TODA KOGYO CORP.
Inventor： Tomohiro HONDA , Anyu ZHANG , Masayuki YOKOTA , Nobuyuki TAGAMI
Abstract: The present invention provides an efficient producing method of high-purity lithium hydroxide, capable of increasing the yield of lithium hydroxide, removing alkali metal impurities, and reducing the amount of by-products generated.
A process for producing lithium hydroxide from lithium sulfate as a starting material containing at least one of sodium and potassium as impurities, which process comprises the following steps of (A) to (F):
(A) a production step of an aqueous lithium hydroxide solution and sulfuric acid by an electrochemical membrane separation method using lithium sulfate as a raw material;
(B) a crystallization step producing a lithium hydroxide crystal by crystallization using the obtained aqueous lithium hydroxide solution in the above electrochemical membrane separation step as a raw material;
(C) a solid-liquid separation step in which a portion of slurry in the above crystallization step is discharged and is subjected to solid-liquid separation to separate a lithium hydroxide crystal and crystallization mother liquor, and thereafter a washing step to clean the separated solid content;
(D) a carbonation step obtaining a slurry comprising a lithium-containing carbonate compound as a solid content by discharging a portion of crystallization mother liquor in said crystallization step and reacting said discharged crystallization mother liquor with carbon dioxide gas, and a solid-liquid separation step separating said slurry into a lithium-containing solid content and a liquid content;
(E) an acid dissolution step producing a lithium sulfate aqueous solution by reacting said lithium-containing solid content with sulfuric acid;
(F) a mixing step reusing the lithium sulfate aqueous solution obtained by said acid dissolution step as the raw material of said step of (A).
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