Method for pulverizing waste denitration catalyst and waste denitration catalyst powder prepared thereby

A waste denitrification catalyst and powder technology, which is applied in the direction of grain processing, etc., can solve the problems such as the difficulty of crushing the waste denitrification catalyst, and achieve a simple and easy crushing method, excellent strength and catalytic performance, and is conducive to subsequent processing and reuse. Effect

Active Publication Date: 2022-07-01
CHINA PETROLEUM & CHEM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a crushing method of spent denitrification catalyst and waste denitrification catalyst powder prepared therefrom in order to overcome the problem of difficulty in crushing waste denitrification catalyst existing in the prior art

Method used

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  • Method for pulverizing waste denitration catalyst and waste denitration catalyst powder prepared thereby

Examples

Experimental program
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Effect test

Embodiment 1

[0071] 1) Use a crusher to crush the waste denitration catalyst, and then screen out D 50 It is the pretreated powder below 30mm;

[0072] 2) Take 2.5g of the pretreated powder obtained in step 1) and put it into a teflon ball mill jar, add 25g of zirconia ball mill beads, including 15g of large ball mill beads with a diameter of 3-5.2mm and a diameter of 0.87mm 10g of small ball grinding beads, then add 3mL polyoxyethylene lauryl ether aqueous solution, the pH of the solution is 6.7, and the polyoxyethylene lauryl ether content is 10g / L;

[0073] 3) Ball milling for 2h under the condition of rotating speed of 200r / min;

[0074] 4) filtering the ball-milling slurry obtained in step 3), removing the ball-milling beads, and washing the ball-milling slurry obtained after filtering with an ethanol solution with a concentration of 99.5% by weight, wherein the content of the ethanol solution is 5 times the volume of the ball-milling slurry, After washing, it was placed at 25 °C fo...

Embodiment 2-18 and comparative example 1-12

[0076] Carry out according to the method of embodiment 1, the difference is:

[0077] The pH of polyvinyl lauryl ether solution and the consumption of polyoxyethylene lauryl ether are different in embodiment 2-9;

[0078] In embodiment 10-18, dispersant is sodium lauryl sulfate, and the pH of sodium lauryl sulfate solution, the consumption of sodium lauryl sulfate and ball milling time are different;

[0079] In Comparative Examples 1-3, the dispersant is sodium lauryl sulfate, and its consumption is different;

[0080] In Comparative Examples 4-6, the dispersing agent is polyoxyethylene lauryl ether, and its consumption is different;

[0081] In Comparative Example 7, without using a dispersant, the polyoxyethylene lauryl ether aqueous solution in Example 1 was replaced with 3 mL of deionized water;

[0082] Comparative examples 8-12 replace polyoxyethylene lauryl ether with different dispersants (Tween 20 or polyethylene glycol 1000), and the pH of the solutions containing...

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Abstract

The invention relates to the field of waste denitration catalyst recycling, and discloses a waste denitration catalyst smashing method and waste denitration catalyst powder prepared through the waste denitration catalyst smashing method. The crushing method of the waste denitration catalyst comprises the following steps: 1) carrying out crushing and screening pretreatment on the waste denitration catalyst to obtain pretreated powder; (2) the pretreated powder, ball milling beads and a solution containing a dispersing agent are subjected to ball milling together, the dispersing agent is lauryl sodium sulfate and/or polyoxyethylene lauryl ether, and the weight ratio of the dispersing agent to the pretreated powder is 1: (50-100). According to the method, the particle size of the crushed powder can be remarkably reduced, and the catalytic performance of the prepared novel denitration catalyst can be further improved.

Description

technical field [0001] The invention relates to the field of recycling and utilization of waste denitration catalysts, in particular to a method for pulverizing waste denitration catalysts and waste denitration catalyst powders prepared therefrom. Background technique [0002] The selective catalytic reduction method is currently the most widely used flue gas denitration technology in the world. It has the advantages of no by-products, no secondary pollution, simple device structure, safe and reliable operation, simple and convenient maintenance, and high denitrification efficiency. More than 90% and many other advantages, this technology is basically applied in most power plants in many countries and regions in the world. [0003] However, the denitration catalyst will gradually attach and accumulate alkali metals, alkaline earth metals and other harmful heavy metal elements during long-term use, which will cause catalyst poisoning, and soot will block the pores of the deni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/10B02C17/20B02C23/06B02C17/22B02C17/18
CPCB02C17/10B02C17/20B02C23/06B02C17/22B02C17/18B02C2201/06
Inventor 周光虎李柯志任靖王博殷喜平沈刚韩帅张新军桂建舟刘丹
Owner CHINA PETROLEUM & CHEM CORP
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