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Recovery method of waste SCR denitration catalyst

A technology of denitrification catalyst and recovery method, which is applied in the field of recovery of waste SCR denitrification catalyst, can solve the problems of regeneration and recovery of titanium dioxide without waste catalyst carrier, resource waste, material consumption, etc., and achieve high product value, efficient recovery and high recovery rate Effect

Pending Publication Date: 2020-11-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing methods are to treat the waste SCR denitrification catalyst by alkaline baking, alkaline or acid leaching. These methods recover and extract the vanadium and tungsten separately, and the regeneration and recovery of the waste catalyst carrier titanium dioxide have not been fully realized, resulting in waste of resources. and material consumption

Method used

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  • Recovery method of waste SCR denitration catalyst
  • Recovery method of waste SCR denitration catalyst
  • Recovery method of waste SCR denitration catalyst

Examples

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Effect test

Embodiment 1

[0083] This embodiment provides a method for recovering a spent SCR denitration catalyst, comprising the following steps:

[0084] (1) Grind and dry the spent catalyst to obtain -45μm catalyst powder, mix and stir the treated catalyst powder with 1.0M ammonium bicarbonate and 1.5M hydrogen peroxide at 80°C for 180min, and the liquid-solid ratio is 10: 1mL / g, the mixture is filtered to obtain the leach residue and the first filtrate;

[0085] (2) Wash and dry the leaching residue (110°C, 12h) to obtain the detoxified catalyst, add the detoxified catalyst to the mixed solution of 0.3M ammonium metavanadate, 1.5M ammonium tungstate and 1M oxalic acid, stir and filter, and dry the filter residue (110°C, 6h), calcined (600°C, 5h) to obtain a regenerated catalyst;

[0086] (3) Add ferrous sulfate to the first filtrate obtained in step (1) to stir, filter, arsenic is separated out in the form of precipitation, and the leaching rate of arsenic is 98%, and the filtrate is extracted an...

Embodiment 2

[0088] This embodiment provides a method for recovering a spent SCR denitration catalyst, comprising the following steps:

[0089] (1) Grind and dry the spent catalyst to obtain -45μm catalyst powder, mix and stir the treated catalyst powder with 2.0M ammonium bicarbonate and 1.5M hydrogen peroxide at 80°C for 180min, and the liquid-solid ratio is 5: 1mL / g, the mixture is filtered to obtain the leach residue and the first filtrate;

[0090] (2) same as embodiment 1;

[0091](3) Add ferrous sulfate to the first filtrate obtained in step (1) to stir, filter, arsenic is separated out in the form of precipitation, and the leaching rate of arsenic is 97%, and the filtrate is extracted and recovered simultaneously to obtain vanadium tungsten, vanadium and tungsten The recoveries were 95% and 97.5%, respectively.

Embodiment 3

[0093] This embodiment provides a method for recovering a spent SCR denitration catalyst, comprising the following steps:

[0094] (1) Grind and dry the spent catalyst to obtain -45μm catalyst powder, mix and stir the treated catalyst powder with 3.0M ammonium bicarbonate and 1.5M hydrogen peroxide at 80°C for 180min, and the liquid-solid ratio is 15: 1mL / g, the mixture is filtered to obtain the leach residue and the first filtrate;

[0095] (2) same as embodiment 1;

[0096] (3) Add ferrous sulfate to the first filtrate obtained in step (1) to stir, filter, arsenic is separated out in the form of precipitation, the leaching rate of arsenic is 100%, and the filtrate is extracted and recovered simultaneously to obtain vanadium tungsten, vanadium and tungsten The recoveries were 95% and 98%, respectively.

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Abstract

The invention relates to a recovery method of a waste SCR denitration catalyst, belongs to the technical field of solid waste recovery treatment, and solves the problems that the structure of the catalyst is damaged and the respective recovery and extraction efficiency of vanadium and tungsten is low in the existing waste catalyst arsenic removal recovery process. The method includes the followingsteps that the waste SCR denitration catalyst is dried, ground and screened, so that catalyst powder is obtained; the catalyst powder is added into a solution containing ammonium bicarbonate or ammonium carbonate and an oxidant for a leaching reaction, so that a mixture is obtained; the mixture is filtered, so that leached residues and first filtrate are obtained, and the leached residues are cleaned and dried; ammonium metavanadate and ammonium tungstate are added into oxalic acid to be mixed, so that a mixed solution is obtained, and the leached residues are added into the mixed solution tobe impregnated; an impregnated solution is filtered, so that a first solid phase is obtained, and the first solid phase is dried and calcined; and ferrous sulfate is added into the first filtrate, sothat a second filtrate and a second solid phase are obtained, and the second filtrate is subjected to extraction. The method realizes recovery and regeneration of the waste catalyst.

Description

technical field [0001] The invention belongs to the technical field of solid waste recovery and treatment, and in particular relates to a recovery method of a waste SCR denitrification catalyst. Background technique [0002] A large number of waste SCR denitrification catalysts are produced in my country every year. Part of the deactivated SCR denitration catalysts can be reused through regeneration, but the regeneration time is limited. After multiple regenerations, almost all waste catalysts will be treated as waste. These waste SCR denitrification catalysts are regarded as hazardous waste due to the presence of arsenic, however these waste SCR denitrification catalysts also contain valuable metals, such as vanadium, tungsten, titanium, etc. pollution and waste of resources. In 2014, with the implementation of new environmental protection regulations, my country's waste SCR denitrification catalysts were listed as hazardous solid waste. Therefore, it is necessary to puri...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/36B01J38/70B01J38/48B01J23/92B01J23/30
CPCC22B7/007C22B34/225C22B34/365B01J38/70B01J38/485B01J23/30B01J23/92Y02P10/20
Inventor 李猛曹亦俊袁君帆
Owner ZHENGZHOU UNIV
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