Method for extracting and separating metal oxides from flue gas denitrification catalyst
A technology for denitrification catalysts and metal separation, applied in titanium oxide/hydroxide, chemical instruments and methods, vanadium oxide, etc., can solve the problems of secondary pollution of the environment and impact on the operating cost of the SCR system, and achieve improved recovery efficiency and good performance Economic benefits and strong operability
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Embodiment 1
[0038] Raw material pretreatment: Firstly, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 8 hours;
[0039] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;
[0040] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 3 times that of the reactant; solid phase and filtrate;
[0041] Acid hydrolysis: Add 87% concentrated sulfuric acid to the solid phase obtained from the separation of the leaching material and stir. The mass ratio of concentrated sulfuric acid to waste denitration cata...
Embodiment 2
[0049] Raw material pretreatment: first, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 10 hours;
[0050] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;
[0051] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 4 times that of the reactant; solid phase and filtrate;
[0052] Acid hydrolysis: add 87% concentrated sulfuric acid to the solid phase obtained from the separation of the extract and stir, the mass ratio of concentrated sulfuric acid to waste denitration catalyst is 2.3...
Embodiment 3
[0060] Raw material pretreatment: first, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 10 hours;
[0061] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;
[0062] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 4 times that of the reactant; solid phase and filtrate;
[0063] Acid hydrolysis: Add 90% concentrated sulfuric acid to the solid phase obtained from the separation of the leachate and stir, the mass ratio of concentrated sulfuric acid to waste denitration catalyst is 2....
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