METHOD AND APPARATUS FOR PRODUCING VANADIUM COMPOUND, AND METHOD AND APPARATUS FOR PRODUCING REDOX-FLOW BATTERY ELECTROLYTE

Title:

METHOD AND APPARATUS FOR PRODUCING VANADIUM COMPOUND, AND METHOD AND APPARATUS FOR PRODUCING REDOX-FLOW BATTERY ELECTROLYTE

Document Type and Number:

WIPO Patent Application WO/2020/250989

Kind Code:

A1

Abstract:

This production method comprises: an alkali extraction step (step 12) for obtaining an alkaline leachate by adding an alkali and water or an alkaline solution to raw material ash, which contains ammonium sulfate, sulfuric acid, vanadium, and at least one other metal selected from among nickel, iron, and magnesium, until a pH of 13 or higher is reached; a solid-liquid separation step (step 13) for separating the alkaline leachate into solid and liquid phases to obtain a vanadium-containing leached filtrate; an evaporation/concentration step (step 14) for evaporating and concentrating the leached filtrate to obtain a concentrate; and a crystallization/solid-liquid separation step (step 15) for cooling the concentrate to cause crystallization and recovering a vanadium compound-containing precipitate. The other production method comprises: an alkali extraction step (step 32); a solid-liquid separation step (step 4); an evaporation/concentration step (step 36); an alkali concentration adjustment step (step 37) for obtaining a concentration-adjusted solution by further adding an alkali or an alkali solution to the concentrate; and a crystallization/solid-liquid separation step (step 38).

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Inventors:

MASAMOTO MANABU
NISHINO TAKASHI
KITAGAWA YUTA
AKAGI DAICHI

Application Number:

PCT/JP2020/023075

Publication Date:

December 17, 2020

Filing Date:

June 11, 2020

Export Citation:

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Assignee:

KAWASAKI HEAVY IND LTD (JP)
NIHON KANKI IND CO LTD (JP)

International Classes:

C01G31/00; B09B3/00; C22B3/12; C22B34/22; H01M8/02; H01M8/18

Domestic Patent References:

WO2017208471A1	2017-12-07
WO2017208471A1	2017-12-07

Foreign References:

CN101748296A	2010-06-23
JPS5319118A	1978-02-22
JP2019046723A	2019-03-22

Other References: