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Method for recycling waste SCR (Selective Catalytic Reduction) catalyst

A technology of SCR catalysts and blocks, which is applied in the field of waste catalyst recycling, can solve the problems of not effectively improving the separation rate and purity of compounds, prolonging the separation and purification process, and increasing processing costs, so as to reduce the enrichment of metal ions and shorten the process process, the effect of saving processing costs

Active Publication Date: 2014-06-11
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since V in the SCR catalyst 2 o 5 and WO 3 or MoO 3 When the concentration of vanadium and tungsten or molybdenum in the recovery liquid is lower than a certain level, it is very difficult to separate and extract these purer substances from the recovery liquid
Although vanadium and tungsten or molybdenum enrichment process can improve V 2 o 5 、WO 3 or MoO 3 output, but still can not effectively improve the separation rate and purity of these compounds, but also prolong the separation and purification process, increase the cost of treatment, more importantly, in the precipitation process of vanadium, tungsten or molybdenum will produce more Waste water, forming a joint environmental pollution or waste liquid treatment problem

Method used

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  • Method for recycling waste SCR (Selective Catalytic Reduction) catalyst
  • Method for recycling waste SCR (Selective Catalytic Reduction) catalyst
  • Method for recycling waste SCR (Selective Catalytic Reduction) catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take a waste honeycomb SCR catalyst from a power plant (size: 90 cm×15 cm×15 cm; service life: 36 months; the inlet end is severely worn; the middle part is cracked; the pore clogging rate is about 1 / 6), and use Blow the surface and pores with a compressed air gun for about 5 minutes, the air pressure is 0.5 MPa, and then use a high-pressure water gun to flush the catalyst pores from the inlet end. The water pressure is adjusted to 20 MPa, and the spraying time is 10 MPa. The catalyst was placed in a forced air drying oven, and the temperature was raised to 80 °C at a rate of 4 °C / min, and kept for 4 h. Take out the catalyst, cut out about 500 g of the catalyst block from the middle, crush it slightly with tweezers, put it into the trough of the rotary pulverizer, and after pulverizing for about 3 minutes, add 100 g of sodium carbonate, then turn on the pulverizer for about 3 minutes, and then Stop the pulverizer and take out the powder.

[0032] Put the mixed powder i...

Embodiment 2

[0036]Take a waste honeycomb SCR catalyst from a power plant (size: 90 cm×15 cm×15 cm; service life: 36 months; the inlet end is severely worn; the middle part is cracked; the pore clogging rate is about 1 / 6), and use Blow the surface and pores with a compressed air gun for about 30 minutes at an air pressure of 0.1 MPa, then use a high-pressure water gun to flush the catalyst pores from the inlet end, adjust the water pressure to 5 MPa, and spray for 30 minutes. The catalyst was placed in a forced air drying oven, and the temperature was raised to 105 °C at a rate of 4 °C / min, and kept for 2 h. Take out the catalyst, cut out about 500 g of the catalyst block from the middle, crush it slightly with tweezers, put it into the trough of the rotary pulverizer, and after pulverizing for about 3 minutes, add 250 g of sodium carbonate, then turn on the pulverizer for about 3 minutes, and then Stop the pulverizer and take out the powder.

[0037] Put the mixed powder into an alumina ...

Embodiment 3

[0041] Take a waste honeycomb SCR catalyst from a power plant (size: 90 cm×15 cm×15 cm; service life: 36 months; the inlet end is severely worn; the middle part is cracked; the pore clogging rate is about 1 / 6), and use Blow the surface and pores with a compressed air gun for about 20 minutes at an air pressure of 0.3 MPa, then use a high-pressure water gun to flush the catalyst pores from the inlet end, adjust the water pressure to 20 MPa, and spray for 20 minutes. The catalyst was placed in a forced air drying oven, and the temperature was raised to 95 °C at a rate of 4 °C / min, and kept for 3 h. Take out the catalyst, cut out about 500 g of the catalyst block from the middle, crush it slightly with tweezers, put it into the trough of the rotary pulverizer, and after pulverizing for about 3 minutes, add 100 g of sodium carbonate, then turn on the pulverizer for about 3 minutes, and then Stop the pulverizer and take out the powder.

[0042] Put the mixed powder into an alumina...

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Abstract

The invention discloses a method for recycling a waste SCR (Selective Catalytic Reduction) catalyst. The method comprises the following steps: blowing off dust of the waste SCR catalyst, washing and drying the waste SCR catalyst and grinding the waste SCR catalyst into powder, then adding sodium carbonate into the powder to mix evenly, and finally, roasting the powder in a high-temperature furnace to obtain a roasted material; grinding the roasted material again, adding the ground roasted material into a dilute sulphuric acid solution, preserving heat and stirring in a water bath for hours, using ammonia water to adjust pH value to be 8-11, and then filtering to obtain a recycling liquid containing vanadium, tungsten or molybdenum. The invention provides a novel method for recycling and processing the waste SCR catalyst, so that the problem that the waste SCR catalyst occupies a large quantity of land and causes secondary pollution can be effectively solved; and meanwhile, heavy metal components in the waste SCR catalyst are fully used, so that valuable natural resources are saved. In addition, the problem that the vanadium, the tungsten or the molybdenum in the normal method of recycling the waste catalyst is difficultly separated and purified can be avoided, the technical process of recycling the waste SCR catalyst is shortened and the recycling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of recycling waste catalysts, in particular to a method for recycling waste SCR catalysts. Background technique [0002] Selective catalytic reduction SCR denitrification technology is an efficient, reliable and mature flue gas denitrification technology, which is widely used in coal-fired power plant boiler flue gas denitrification systems in China. SCR denitrification catalyst is a key component of this technology. The "Twelfth Five-Year Plan" requires my country's coal-fired power plants to strictly implement the new standards for flue gas denitrification, which stimulated the explosive growth of SCR catalyst market demand during the "Twelfth Five-Year Plan" period. With the current use of hundreds of millions of tons of SCR catalysts, waste SCR catalysts will become a major solid waste treatment problem in this field in a few years. Under the premise that there is no mature waste SCR catalyst treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/06C22B3/44C22B3/22C22B3/42C22B34/12C22B34/34C22B34/36C22B34/22
CPCY02P10/20
Inventor 路光杰汪德志杨建辉肖雨亭欧阳丽华梅雪张弘
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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