Method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalyst
A technology for denitration catalysts and waste catalysts, applied in chemical instruments and methods, vanadium oxide, inorganic chemistry, etc., can solve the problems of not forming a complete and mature recycling technology and related scale, difficult to realize industrialization of technology, and poor product quality, etc. Effects of diffusivity and solubility, low recovery process cost, reduced maintenance and replacement costs
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Embodiment 1
[0031] Embodiment 1 describes a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:
[0032] (1) Raw material pretreatment
[0033] Using the flat-plate SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash attached to the surface, and then vibrate the plate-type catalyst to separate the catalyst from the metal mesh plate; collect the detached catalyst and roast it at 600°C for 6 hours; The catalyst was pulverized and sieved to obtain waste catalyst powder below 150 mesh.
[0034] (2) Separation and recovery of vanadium
[0035] Get 5kg waste catalyst powder and add in 30kg acetic acid solution, the volume concentration of acetic acid solution is 10%; Add 0.3kg fatty acid polyoxyethylene ester additionally to the solution, then feed N under the condition of heating and stirring at 80°C 2 and SO 2 mixed gas, SO 2 The volume concentration is 5%, the mixed gas...
Embodiment 2
[0042] Embodiment 2 describes a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:
[0043] (1) Raw material pretreatment
[0044] Using the honeycomb SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash on the surface, and then roast the catalyst at 650°C for 5 hours; crush and sieve the roasted catalyst to obtain waste catalyst powder below 150 mesh .
[0045] (2) Separation and recovery of vanadium
[0046] Get 3kg waste catalyst powder and add in 18kg acetic acid solution, the volume concentration of acetic acid solution is 15%; Add 0.09kg fatty acid polyoxyethylene ester additionally in the solution, then feed N under the condition of heating and stirring at 85°C 2 and SO 2 mixed gas, SO 2 The volume concentration is 4%, the mixed gas flow rate is 5L / min, fully reacted for 2.5h, and filtered to obtain dark blue VOSO 4 Solution and solid residue, the...
Embodiment 3
[0053] Embodiment 3 describes another method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:
[0054] (1) Raw material pretreatment
[0055] Using the flat-plate SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash attached to the surface, and then vibrate the plate-type catalyst to separate the catalyst from the metal mesh plate; collect the detached catalyst and roast it at 700°C for 4 hours; The catalyst was pulverized and sieved to obtain waste catalyst powder below 150 mesh.
[0056] (2) Separation and recovery of vanadium
[0057] Take 10kg of waste catalyst powder and add it to 60kg of formic acid solution, the volume concentration of formic acid solution is 20%; add 0.9kg of fatty acid polyoxyethylene ester to the solution, and then pass N under the condition of heating and stirring at 90°C. 2 and SO 2 mixed gas, SO 2 The volume concentration is 3%, t...
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