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Method and apparatus for recycling metal oxide from waste flue gas denitration catalyst
The invention discloses a method and an apparatus for recycling metal oxide from a waste flue gas denitration catalyst. The method comprises the following steps: S1, the catalyst is crushed and concentrated sulfuric acid is added for acidolysis, after acidolysis, water is added to obtain a titanyl sulfate solution; S2, the titanyl sulfate solution is filtered, filter residues are standby, a filtrate is heated, condensed and hydrolyzed for obtaining a hydrolysate; S3, the hydrolysate is filtered to obtain a filtrate and a metatitanic acid deposition; S4, salt treatment, a drying and a calcination are carried out for the metatitanic acid deposition, and TiO2 is obtained; S5: sedimentation treatment is carried out for the filtrate in the S3, after filtering, a upper level clear liquid is taken, excessive NH4Cl is added into the clear liquid for reaction, after filtering, andammonium metavanadate deposition is obtained; the ammonium metavanadate deposition is calcined, and V2O5 is obtained; S6, excessive ammoniacal liquor is added into the filter residues in the S2 for reaction, and a filtering is carried out; a filtrate is heated to generate a ammonium paratungstate crystal; the ammonium paratungstate crystal is dried and calcined, and WO3 is obtained. According to the method, V, Ti and W three components can be completely separated.
Method and apparatus for recycling metal oxide from waste flue gas denitration catalyst
The invention discloses a method and an apparatus for recycling metal oxide from a waste flue gas denitration catalyst. The method comprises the following steps: S1, the catalyst is crushed and concentrated sulfuric acid is added for acidolysis, after acidolysis, water is added to obtain a titanyl sulfate solution; S2, the titanyl sulfate solution is filtered, filter residues are standby, a filtrate is heated, condensed and hydrolyzed for obtaining a hydrolysate; S3, the hydrolysate is filtered to obtain a filtrate and a metatitanic acid deposition; S4, salt treatment, a drying and a calcination are carried out for the metatitanic acid deposition, and TiO2 is obtained; S5: sedimentation treatment is carried out for the filtrate in the S3, after filtering, a upper level clear liquid is taken, excessive NH4Cl is added into the clear liquid for reaction, after filtering, andammonium metavanadate deposition is obtained; the ammonium metavanadate deposition is calcined, and V2O5 is obtained; S6, excessive ammoniacal liquor is added into the filter residues in the S2 for reaction, and a filtering is carried out; a filtrate is heated to generate a ammonium paratungstate crystal; the ammonium paratungstate crystal is dried and calcined, and WO3 is obtained. According to the method, V, Ti and W three components can be completely separated.
Method and apparatus for recycling metal oxide from waste flue gas denitration catalyst
LI WEILIN (author) / SU JUNHUA (author) / LI WEI (author) / HU YONGFENG (author) / SHEN YUHUI (author)
2016-01-06
Patent
Electronic Resource
English
IPC:
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
C01D
Verbindungen der Alkalimetalle, d.h. des Lithiums, Natriums, Kaliums, Rubidiums, Cäsiums oder Franciums
,
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
/
C04B
Kalk
,
LIME
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