Comprehensive recycling method for waste titanium based vanadium SCR catalyst

An SCR catalyst and titanium-based vanadium-based technology, which is applied in the field of comprehensive recycling and utilization of waste titanium-based vanadium-based SCR catalysts, can solve the problems of failure to recover valuable metal resources, increase enterprise costs, and waste effective resources, etc. Realize resource utilization, reduce processing costs, and achieve the effect of recycling

Active Publication Date: 2015-03-04
HUADIAN HIGH TECH GAOBEIDIAN ENVIRONMENTAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts based on titanium oxide are widely used at present. If these waste catalysts are piled up randomly without disposal, on the one hand, it will occupy a large amount of land resources and increase the cost of the enterprise; Some toxic and harmful substances adsorbed enter the natural environment, especially water bodies, causing serious harm to the environment; the various valuable metal resources contained in the discarded catalysts have not been recycled, which also causes a huge waste of effective resources

Method used

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  • Comprehensive recycling method for waste titanium based vanadium SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the discarded honeycomb SCR catalyst (losing strength and cannot be regenerated) from a power plant, crush the block catalyst into flakes, and then sieve. First, use a sieve with a pore size of 1.25mm to sieve for 3 minutes. The sieve with a mass ratio of 92.5% is a catalyst with a small amount of dust attached to the surface, and the undersize is a fine catalyst mixed with dust; then use a sieve with a 0.425mm pore size. After sieving for 3 minutes, the oversieve is all catalyst, and the undersieve is mostly dust. Take the sieved catalyst (with a small amount of dust on the surface), wash it with a high-pressure water gun, adjust the water pressure to 1 MPa, and spray and sweep for 2 minutes, then put the catalyst in a resistance drying oven and dry it to constant weight.

[0028] The dried catalyst is ground by a vibration ball mill, the ball milling time is 4min, and the rotation speed is 700-960r / min. Take 100 powders, leaching with 5% concentration of hydroch...

Embodiment 2

[0033] Take the discarded honeycomb SCR catalyst from a power plant, and use a compressed air gun to blow the surface and pores for about 20 minutes, and the pressure of the compressed air gun is 0.2MPa. The collected dust was sieved with a 0.8mm sieve, and the oversieved material was mixed with the catalyst obtained by purging. The dried catalyst was broken into small pieces, and then put into a vibrating ball mill to grind finely. The ball milling time was 2 minutes, and the rotating speed was 960r / min, and the powder was taken out.

[0034] Put the finely ground powder into a beaker, add 8% hydrochloric acid with a catalyst amount, add 3% sodium sulfite with a catalyst amount, stir it with electric power in a water bath at 90°C for 5 hours, then filter it with a vacuum filter, and use 80°C deionized water After washing for 3 times, the leaching rate of vanadium can reach 88.5%. The liquid vanadium-containing solution is neutralized with lime and soda ash solution to pH 2.5...

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Abstract

The invention relates to a comprehensive recycling method for a waste titanium based vanadium SCR (selective catalytic reduction) catalyst. The method comprises the steps of: removing dust from the waste SCR catalyst; crushing the treated SCR catalyst; subjecting the crushed powder material to acid leaching vanadium extraction in an acid leaching tank, conducting neutralization, reduction and purification on the leachate, then employing P204 to conduct organic extraction, and performing drying to obtain the product ammonium metavanadate; washing the leaching residue generated by vanadium extraction to be close to neutral, adding sodium carbonate to conduct roasting so as to obtain a roasted material, levigating the roasted material and then conducting water leaching, adjusting the obtained leachate with acid to a pH value of 6-9, adsorbing tungsten with weakly basic anions, resolving the loaded resin with a mixed solution of ammonia water and ammonium chloride; heating the resolved solution to boiling and volatilizing ammonia in the solution until the pH value of the ammonia solution is reduced to 7.0-7.7, performing cooling to obtain wet ammonium paratungstate, and finally carrying out drying to obtain the product ammonium paratungstate. The method provided by the invention can effectively recover valuable metals in the waste catalyst.

Description

technical field [0001] The invention relates to a method for comprehensive recovery and utilization of waste titanium-based vanadium-based SCR catalysts. Background technique [0002] Nitrogen oxides (NOx) are one of the main components of air pollutants and the main cause of acid rain. With the development of social economy and increasingly stringent environmental protection requirements, countries around the world are increasingly strengthening the control of nitrogen oxides (NOx). In my country, 70% of nitrogen oxide emissions come from coal combustion. How to effectively control NOx emissions has become the focus of attention in my country and even the world. [0003] Among many treatment methods, selective catalytic reduction (SCR) has the advantages of high efficiency, reliability, no by-products, simple system equipment and mature technology, and is currently the most widely used method in industry (accounting for 96%). In the SCR system, the catalyst is the core, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 李建国赵术求赵毅齐兆树牛磊雷湘刘景槐
Owner HUADIAN HIGH TECH GAOBEIDIAN ENVIRONMENTAL TECH
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