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Method for extraction of vanadium from waste SCR catalyst and preparation of activated titanium silicon tungsten powder

An SCR catalyst, titanium silicon tungsten technology, applied in the field of waste catalyst recycling, can solve problems such as low cost, achieve the effects of low price, reduce consumption, and overcome sodium ion pollution

Active Publication Date: 2017-03-22
安徽思凯瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The technical problem to be solved in the present invention is to provide a method with low cost and low energy consumption: a method for extracting invalid vanadium from waste SCR catalysts and activating titanium-silicon-tungsten powder to make it a new catalyst preparation raw material; the method not only It solves the problem of harmless disposal of SCR catalyst and realizes the reuse of resources

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  • Method for extraction of vanadium from waste SCR catalyst and preparation of activated titanium silicon tungsten powder

Examples

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Effect test

Embodiment 1

[0058] 1) Carry out pretreatment to waste SCR catalyst to remove the impurity that is adsorbed; Said pretreatment includes carrying out water shower and soaking, ultrasonic cleaning, acidification and water washing treatment to waste SCR catalyst; Poisoning elements such as potassium, sodium and arsenic are cleaned, and the functions of titanium dioxide and tungsten trioxide are initially restored. The impurities are fly ash and coke.

[0059] 2) wet crushing the pretreated waste SCR catalyst to a slurry with a predetermined particle size; the slurry formed by the wet crushing is a slurry with a particle size of 180 mesh.

[0060] 3) Add an oxalic acid solution with a concentration of 4% (mass volume ratio) to the slurry, and the mass ratio of the waste SCR catalyst to the oxalic acid solution is 1:4, stir and react in a reaction kettle at a temperature of 80°C for 3-4 hour, so that the vanadium pentoxide component is dissolved into vanadyl oxalate to achieve the purpose of v...

Embodiment 2

[0074] This embodiment provides a method for extracting vanadium from waste SCR catalysts to prepare activated titanium-silicon-tungsten powder similar to that of Embodiment 1, which specifically includes the following steps:

[0075] 1) Carry out pretreatment to waste SCR catalyst to remove the impurity that is adsorbed; Said pretreatment includes carrying out water shower and soaking, ultrasonic cleaning, acidification and water washing treatment to waste SCR catalyst; Poisoning elements such as potassium, sodium and arsenic are cleaned, and the functions of titanium dioxide and tungsten trioxide are initially restored. The impurities are fly ash and coke.

[0076] 2) wet crushing the pretreated waste SCR catalyst to a slurry with a certain particle size, for example, a slurry with a particle size of 325 mesh;

[0077] 3) Add an oxalic acid solution with a mass percentage concentration of 9% (mass volume ratio) to the slurry, and the mass ratio of the waste SCR catalyst to ...

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Abstract

The invention discloses a method for extraction of failure vanadium from a waste SCR catalyst and preparation of activated titanium silicon tungsten powder for making a new denitration catalyst. The method includes: conducting pretreatment on a waste SCR catalyst, performing wet grinding to obtain a slurry, and adding an oxalic acid solution to carry out leaching reaction; carrying out filter-press separation to obtain tungsten silicon-containing titanium slag powder and press filtrate, then performing cleaning, activation, and fine grinding to obtain nanoscale titanium silicon tungsten powder; separating the press filtrate, recovering oxalic acid and returning the recovered oxalic acid to leaching reaction, adding an oxidizing agent into the separated liquid to carry out precipitation reaction so as to obtain ammonium metavanadate precipitate, and conducting filtering and separation to obtain ammonium metavanadate solid. The method provided by the invention uses oxalic acid for reaction under a normal temperature condition, can separate failure vanadium salt from the SCR catalyst, utilizes acid to activate other components and then performs fine grinding and other treatments so as to obtain the raw material for preparation of a new denitration catalyst. The process provided by the invention has the characteristics of low technological investment requirement and low energy consumption, effectively solves the harmless treatment problem of the SCR catalyst, and realizes recycling of resources.

Description

technical field [0001] The invention relates to the technical field of recycling waste catalysts, in particular to a method for extracting vanadium from waste SCR catalysts and preparing activated titanium silicon tungsten powder. Background technique [0002] In August 2014, the Ministry of Environmental Protection officially issued the "Notice on Strengthening the Supervision of Waste Flue Gas Denitrification Catalysts" and "Guidelines for Examination of Hazardous Waste Operation Permits for Waste Flue Gas Denitrification Catalysts", which included waste flue gas denitrification catalysts (vanadium-titanium series) Hazardous wastes are managed and classified as "HW49 other wastes" in the "National Hazardous Waste List" (the new regulations promulgated in 2016 were changed to HW50). [0003] SCR denitrification catalysts are usually installed in a "2+1" installation mode. The normal SCR denitrification catalyst has a service life of about 2 years, and deactivated waste SCR ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C01G31/00B01J38/62B01J23/30
CPCB01J23/30B01J38/62C01G31/003C22B7/006C22B34/225Y02P10/20Y02P20/584
Inventor 施文李彬彬李金峰骆秀宽
Owner 安徽思凯瑞环保科技有限公司
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