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Method and device for recycling Ti and W from waste flue gas denitrification catalyst
The invention discloses a method and device for recycling Ti and W from a waste flue gas denitrification catalyst. The method comprises the steps that 1, the catalyst is smashed, concentrated sulfuric acid is added for acidolysis, and water is added after acidolysis is performed to obtain a titanyl sulfate solution; 2, the titanyl sulfate solution is filtered, filter residues are collected for use, and a filtrate is heated and concentrated for hydrolysis to obtain a hydrolysis product; 3, the hydrolysis product is filtered to obtain a filtrate and metatitanic acid sedimentation; 4, salt treatment, drying and roasting are performed on the metatitanic acid sedimentation to obtain a finished product TiO2; 5, excessive ammonium hydroxide is added into the filter residues in the second step, and filtering is performed, and the filtrate is heated to generate ammonium paratungstate crystals; the ammonium paratungstate crystals are dried and roasted to obtain pure WO3. The method can recycle pure TiO2 and WO3 from the waste flue gas denitrification catalyst. After the method is adopted, the recycling efficiency of TiO2 and the recycling efficiency of WO3 reach 95% and 93% respectively, and the purity of TiO2 and the purity of WO3 can reach 99% and 90% respectively.
Method and device for recycling Ti and W from waste flue gas denitrification catalyst
The invention discloses a method and device for recycling Ti and W from a waste flue gas denitrification catalyst. The method comprises the steps that 1, the catalyst is smashed, concentrated sulfuric acid is added for acidolysis, and water is added after acidolysis is performed to obtain a titanyl sulfate solution; 2, the titanyl sulfate solution is filtered, filter residues are collected for use, and a filtrate is heated and concentrated for hydrolysis to obtain a hydrolysis product; 3, the hydrolysis product is filtered to obtain a filtrate and metatitanic acid sedimentation; 4, salt treatment, drying and roasting are performed on the metatitanic acid sedimentation to obtain a finished product TiO2; 5, excessive ammonium hydroxide is added into the filter residues in the second step, and filtering is performed, and the filtrate is heated to generate ammonium paratungstate crystals; the ammonium paratungstate crystals are dried and roasted to obtain pure WO3. The method can recycle pure TiO2 and WO3 from the waste flue gas denitrification catalyst. After the method is adopted, the recycling efficiency of TiO2 and the recycling efficiency of WO3 reach 95% and 93% respectively, and the purity of TiO2 and the purity of WO3 can reach 99% and 90% respectively.
Method and device for recycling Ti and W from waste flue gas denitrification catalyst
SU JUNHUA (Autor:in) / SHEN YUHUI (Autor:in) / FU LIHUI (Autor:in) / LI WEILIN (Autor:in)
16.12.2015
Patent
Elektronische Ressource
Englisch
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