Method for selective recovery of valuable metal from waste denitrification catalyst through alkali fusion

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United States of America Patent

PATENT NO 12037659
APP PUB NO 20210130928A1
SERIAL NO

16633257

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Abstract

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The present invention provides a method for selective recovery of a valuable metal from a waste denitrification catalyst through alkali fusion, the method comprising the steps of: (a) adding an alkali metal to a waste denitrification catalyst, followed by mixing and alkali fusion, to generate a calcination product; (b) subjecting the calcination product to water-leaching to recover an alkali leachate and a residue; (c) adding a precipitator to the alkali leachate, followed by stirring, to recover calcium metavanadate (Ca(VO3)2) or calcium tungstate (CaWO4) through precipitation; and (d) subjecting the recovered calcium tungstate to acid decomposition to prepare tungstic acid. Therefore, vanadium and tungsten can be recovered at high efficiency by a method in which a precipitator is added to a leachate, which is obtained by adding an excess amount of an alkali metal to a waste denitrification catalyst and carrying out calcination and water-leaching, and then a reaction rate is controlled.

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Patent Owner(s)

Patent OwnerAddress
KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES124 GWAHAK-RO YUSEONG-GU DAEJEON 305-350

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kang, Hee-Nam Seosan-si, KR 1 1
Kang, Jung-Shin Daejeon, KR 1 1
Lee, Jin-Young Daejeon, KR 178 1449

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