Title:
アルカリ融解による廃脱窒触媒から選択的な有価金属の回収方法
Document Type and Number:
Japanese Patent JP6955621
Kind Code:
B2
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 Jinyoung
Kang Jung Shin
Kang Hinam
Kang Jung Shin
Kang Hinam
Application Number:
JP2020503954A
Publication Date:
October 27, 2021
Filing Date:
July 27, 2018
Export Citation:
Assignee:
Korea Institute of Geoscience and Mineral Resources
International Classes:
B01J23/30; C22B7/00; B01J38/00; B09B3/00; C22B1/02; C22B3/04; C22B3/08; C22B3/10; C22B3/44; C22B34/12; C22B34/22; C22B34/36
Domestic Patent References:
| JP4114747A |
Foreign References:
| US20080131343 | ||||
| CN105648241A | ||||
| CN105002361A | ||||
| KR101281579B1 | ||||
| KR101452179B1 |
Attorney, Agent or Firm:
Kenji Sugimura
Mitsutsugu Sugimura
Masaki Kato
Mitsutsugu Sugimura
Masaki Kato