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Recovery method of waste SCR denitration catalyst

A technology for denitrification catalysts and waste catalysts, which is applied in the field of recovery of waste SCR denitrification catalysts, and can solve the problems of low recovery rate, difficult industrial application, and efficient recovery of vanadium, etc.

Active Publication Date: 2020-02-21
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the research on the recovery of waste SCR denitrification catalysts has just started, most of the proposed technical solutions cannot really efficiently recover components such as vanadium, tungsten / molybdenum, and titanium, and problems such as high cost, low recovery rate, low product utilization value, and difficulty in industrial application remain. exist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 has described a kind of recovery method of waste SCR denitration catalyst, and specific steps include:

[0032] (1) Pretreatment

[0033] Using vanadium-molybdenum-titanium honeycomb waste SCR denitrification catalyst as raw material, first blow off the loose dust attached to the surface by compressed air; use 2wt% fatty alcohol sodium sulfate, 3wt% fatty alcohol polyoxyethylene ether, 1wt% tripolyphosphate Wash the spent catalyst with an aqueous solution of sodium and 1.5 wt% hydrochloric acid, then dry the spent catalyst naturally in the shade; roast the catalyst at 650°C for 5 hours, and finally crush the spent catalyst to a size below 200 mesh for use.

[0034] (2)TiO 2 separate

[0035] Ba(OH) with a mass ratio of 2:1 2 The solid and waste catalyst powder were mixed evenly, and roasted at 700°C for 4 hours; the sintered block was crushed to below 200 mesh, and the powder was leached three times with a dilute hydrochloric acid solution with a volume ...

Embodiment 2

[0046] Embodiment 2 has described a kind of recovery method of waste SCR denitration catalyst, and specific steps include:

[0047] (1) Pretreatment

[0048] Using vanadium-tungsten-titanium honeycomb waste SCR denitrification catalyst as raw material, first blow off the loose dust attached to the surface by compressed air; use 3wt% fatty alcohol sodium sulfate, 5wt% fatty alcohol polyoxyethylene ether, 2wt% tripolyphosphate Wash the spent catalyst with an aqueous solution of sodium and 2wt% hydrochloric acid, then dry the spent catalyst naturally in the shade; roast the catalyst at 550°C for 4 hours, and finally crush the spent catalyst to a size below 200 mesh for future use.

[0049] (2)TiO 2 separate

[0050] Ba(OH) with a mass ratio of 1.5:1 2 Mix the solid and waste catalyst powder evenly, and roast at 800°C for 4 hours; crush the agglomerate to below 200 mesh, and repeat the leaching of the powder 3 times with a dilute hydrochloric acid solution with a volume concent...

Embodiment 3

[0061] Embodiment 3 has described the recovery method of another kind of waste SCR denitration catalyst, and specific steps include:

[0062] (1) Pretreatment

[0063] Using vanadium-molybdenum-titanium flat-plate waste SCR denitrification catalyst as raw material, the loose dust attached to the surface is first blown off by compressed air; Wash the waste catalyst with an aqueous solution of sodium phosphate and 3wt% hydrochloric acid, and then dry the waste catalyst naturally in the shade; roast the catalyst at 700°C for 4 hours, separate the catalyst from the metal mesh by shaking and scraping, collect the detached waste catalyst and crush it to 200 mesh The following spare.

[0064] (2)TiO 2 separate

[0065] Ba(OH) with a mass ratio of 2.5:1 2 Mix the solid and spent catalyst powder evenly, and roast at 750°C for 3 hours; crush the agglomerate to below 200 mesh, and repeat the leaching of the powder 4 times with a dilute hydrochloric acid solution with a volume concent...

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PUM

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Abstract

The invention belongs to the field of non-ferrous metal recovery, and particularly relates to a recovery method of a waste SCR denitration catalyst. The recovery method comprises the steps of pretreatment, TiO2 separation, extraction and purification, titanium recovery, vanadium recovery, tungsten / molybdenum recovery and the like. The recovery method is capable of recycling a several precious recovery products such as V2O5, ammonium tungstate / ammonium molybdate and BaTiO3 from the waste SCR denitration catalyst. The invention provides an effective technical scheme, and efficient resource utilization of the waste SCR denitration catalyst can be realized.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, and in particular relates to a recovery method of a waste SCR denitration catalyst. Background technique [0002] The recycling and utilization of industrial solid waste is closely related to the national environmental protection strategy. The efficient and harmless treatment of industrial solid waste has become an important part of the field of environmental protection, and the waste SCR denitrification catalyst has become an important solid waste. Relevant treatment schemes and technical process research have also attracted more and more attention. [0003] SCR denitrification technology is the mainstream denitrification technology in China. It was first widely used in coal-fired power plant flue gas denitrification, and achieved very remarkable results, so that NOx emissions can meet the relevant national standards. With the increasingly stringent environmental protection requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G31/02C01G41/00C01G39/00C04B35/468C04B35/626
CPCC01G23/006C01G23/001C01G31/003C01G31/02C01G41/00C01G41/003C01G39/00C01G39/003C04B35/4682C04B35/62605C01P2006/80Y02P20/584
Inventor 曲艳超陈晨陆强
Owner 北京华电光大环境股份有限公司
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