Title:
METHOD FOR SELECTIVE RECOVERY OF VALUABLE METAL FROM WASTE DENITRIFICATION CATALYST THROUGH ALKALI FUSION
Document Type and Number:
WIPO Patent Application WO/2019/022555
Kind Code:
A1
Abstract:
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.
Inventors:
LEE JIN-YOUNG (KR)
KANG JUNG-SHIN (KR)
KANG HEE-NAM (KR)
KANG JUNG-SHIN (KR)
KANG HEE-NAM (KR)
Application Number:
PCT/KR2018/008523
Publication Date:
January 31, 2019
Filing Date:
July 27, 2018
Export Citation:
Assignee:
KOREA INST GEOSCIENCE & MINERAL RESOURCES (KR)
International Classes:
C22B34/36; C22B1/02; C22B3/12; C22B3/20; C22B34/12
Foreign References:
| KR101281579B1 | 2013-07-03 | |||
| KR101452179B1 | 2014-10-24 | |||
| KR20140104254A | 2014-08-28 | |||
| KR100573004B1 | 2006-04-24 | |||
| JP2009511755A | 2009-03-19 | |||
| KR101281579B1 | 2013-07-03 |
Other References:
See also references of EP 3660175A4
Attorney, Agent or Firm:
DAE-A INTELLECTUAL PROPERTY CONSULTING (KR)
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