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Treatment method of waste SCR denitration catalyst, composite opacifier for ceramic, ceramic glaze and ceramic product

A technology of denitrification catalyst and treatment method, which is applied in the field of waste SCR denitrification catalyst treatment, to achieve good opacity performance, increase utilization value, and reduce production cost

Active Publication Date: 2020-04-10
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a treatment method for waste SCR denitration catalysts, which solves the problem of reusing waste SCR denitration catalysts and greatly improves the utilization value of waste SCR denitration catalysts

Method used

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  • Treatment method of waste SCR denitration catalyst, composite opacifier for ceramic, ceramic glaze and ceramic product
  • Treatment method of waste SCR denitration catalyst, composite opacifier for ceramic, ceramic glaze and ceramic product
  • Treatment method of waste SCR denitration catalyst, composite opacifier for ceramic, ceramic glaze and ceramic product

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Experimental program
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Embodiment approach

[0074] As an optional embodiment of the present invention, the cleaning includes the steps of soot blowing and soaking.

[0075] As an optional embodiment of the present invention, the soot blowing includes the step of using a high-pressure air gun to blow the surface and pores of the spent SCR denitration catalyst.

[0076] The purpose of purging with a high-pressure air gun is to remove the dust brought in by the flue gas attached to the surface of the spent SCR denitration catalyst.

[0077] As an optional embodiment of the present invention, the soaking includes the step of washing the waste SCR denitration catalyst in an acid solution and clean water in sequence.

[0078] Washing the waste SCR denitrification catalyst in an acid solution can remove the quartz adsorbed on the surface of the waste SCR denitrification catalyst, and the mercury, arsenic, lead and other elements that are easy to migrate in the environment that may be attached to the coal flue gas. The organic...

Embodiment 1

[0120] This embodiment provides a treatment method for a waste SCR denitration catalyst, comprising the following steps:

[0121] (a) Use a high-pressure air gun to blow the surface and pores of the spent SCR denitration catalyst for soot blowing;

[0122] Then use 5% dilute sulfuric acid solution to soak the waste SCR denitration catalyst at 40°C for 1.0h, and then clean it with clean water;

[0123] Finally, the waste SCR denitrification catalyst after the above treatment was put into a blast drying oven for drying, the drying temperature was 80°C, and the drying time was 4 hours;

[0124] Put the above-mentioned dried waste SCR denitrification catalyst into a crushing device, and crush it to an average particle size of 100 mesh to obtain a pretreated waste SCR denitrification catalyst;

[0125] TiO in the waste SCR denitration catalyst after pretreatment 2 The content is 88wt%;

[0126] (b) Mix the pretreated waste SCR denitrification catalyst with the dispersant sodium ...

Embodiment 2

[0129] This example provides a treatment method for a waste SCR denitration catalyst, except for step (b), the other steps and process parameters are the same as those in Example 1.

[0130] In step (b) of this example, the pretreated waste SCR denitration catalyst is mixed with dispersant sodium polyacrylate, 200 mesh wollastonite, and 200 mesh calcium carbonate, and ground in an aqueous medium using a horizontal grinder , the grinding time is 1h, and the grinding slurry is obtained; wherein, the quality of sodium polyacrylate is 1.5‰ of the waste SCR denitration catalyst quality, and the mass ratio of the waste SCR denitration catalyst after pretreatment, wollastonite and calcium carbonate is 50: 10:40;

[0131] The ground mixture is dried by using a flash dryer to obtain a composite emulsifier for ceramics.

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Abstract

The invention provides a treatment method of a waste SCR denitration catalyst, a composite opacifier for ceramic, ceramic glaze and a ceramic product, and relates to the technical field of treatment of waste SCR denitration catalysts. The treatment method comprises the following steps: mixing a pretreated waste SCR denitration catalyst, wollastonite, calcium carbonate and an optional dispersant, and crushing to obtain the composite opacifier for ceramic, wherein the waste SCR denitration catalyst is used as a raw material of the composite opacifier for the ceramic, so that the problem of reutilization of the waste SCR denitration catalyst is solved, the utilization value of the waste SCR denitration catalyst is greatly improved, and meanwhile, the production cost of the composite opacifierfor the ceramic is greatly reduced; and meanwhile, the obtained composite opacifier for the ceramic has good opacifying performance when in use. The invention also provides thecomposite opacifier forceramic. The composite opacifier is prepared by adopting the treatment method of the waste SCR denitration catalyst.

Description

technical field [0001] The invention relates to the technical field of waste SCR denitration catalyst treatment, in particular to a treatment method of waste SCR denitration catalyst, a composite emulsifier for ceramics, ceramic glaze and ceramic products. Background technique [0002] Selective Catalytical Reduction (SCR) denitration technology is an efficient, reliable and mature flue gas denitrification technology, which is widely used in coal-fired power plant boiler flue gas denitrification system, among which SCR denitrification catalyst is the key to this technology part. The SCR denitration catalyst is mainly composed of titanium dioxide, vanadium pentoxide, tungsten trioxide or molybdenum trioxide. In the actual operation of the SCR device, the continuous high temperature environment and a large amount of flue gas with alkali metals that poison the catalyst will reduce the active centers on the catalyst surface, thereby reducing its catalytic effect. A large numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/14C03C8/00C04B41/86
CPCC03C8/00C03C8/14C04B41/5022C04B41/86
Inventor 敖卫华丁浩孙思佳林昌恒张啸林陈鑫
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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