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Recovery process of honeycomb type selective catalytic reduction (SCR) waste catalyst containing tungsten, vanadium and titanium

A waste catalyst, honeycomb technology, applied in the direction of vanadium compounds, tungsten compounds, titanium oxide/hydroxide, etc., can solve the problem of heavy metal treatment that has not been proposed and described in detail, and the recovery of TiO in SCR denitrification catalysts has not been mentioned. Disposal methods and other issues to achieve the effect of high recovery rate and high purity

Inactive Publication Date: 2013-02-20
曾瑞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent describes the recovery of WO from the SCR denitration catalyst 3 and V 2 o 5 process, but did not specify the WO after recovery 3 and V 2 o 5 The yield and the purity of the corresponding product, also did not mention the TiO in the SCR denitration catalyst 2 recovery and disposal methods; meanwhile, the patent does not describe in detail the treatment of heavy metals accumulated in spent SCR catalysts and other 2 CO 3 The treatment method of impurities (such as Si, B and other elements) that react and enter the leach solution
On the other hand, the method of this patent application fails to propose effective measures for the treatment of spent SCR catalysts and Na 2 CO 3 Secondary environmental pollution caused by fly ash in the calcination process

Method used

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  • Recovery process of honeycomb type selective catalytic reduction (SCR) waste catalyst containing tungsten, vanadium and titanium
  • Recovery process of honeycomb type selective catalytic reduction (SCR) waste catalyst containing tungsten, vanadium and titanium
  • Recovery process of honeycomb type selective catalytic reduction (SCR) waste catalyst containing tungsten, vanadium and titanium

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Embodiment 1

[0095] The recovery process from the honeycomb SCR waste catalyst containing tungsten, vanadium and titanium includes the following steps in sequence:

[0096] (1) Contains WO 3 4.35% (wt%), V2 o 5 1% (wt%), TiO 2 80% (wt%) of the spent SCR catalyst is washed with high-pressure water to remove ash, crushed by a jaw crusher to a particle size of ≤20cm, wet-milled by a ball mill to a particle size of 120 mesh, and passed through completely; in the leaching balls, 666g / l concentration of industrial liquid is used Alkali is leached for 4 hours at 155°C and a pressure of 0.6Mpa, and the liquid-solid ratio of leaching (NaOH solution volume m 3 : SCR quality t) is 3.2; leachate and filter residue are obtained after solid-liquid separation, the filter residue is washed with deionized process water, and the washing liquid is merged into the filtrate; the filter residue is used for the production of rutile titanium dioxide, and the filtrate is used for ammonium paratungstate and metav...

Embodiment 2

[0107] The recovery process from the honeycomb SCR waste catalyst containing tungsten, vanadium and titanium includes the following steps in sequence:

[0108] (1) Contains WO 3 6.09% (wt%), V 2 o 5 0.5% (wt%), TiO 2 80% (wt%) of the spent SCR catalyst was washed with high-pressure water to remove ash, crushed by a jaw crusher to a particle size of ≤20cm, and wet-milled by a ball mill until the particle size was 120 mesh; Industrial liquid caustic soda is leached for 4 hours at 180°C and a pressure of 0.7Mpa, and the leaching liquid-solid ratio (volume of NaOH solution m 3 : SCR quality t) is 3.5; leachate and filter residue are obtained after solid-liquid separation, the filter residue is washed with deionized process water, and the washing liquid is merged into the filtrate; the filter residue is used for the production of rutile titanium dioxide, and the filtrate is used for ammonium paratungstate and metavanadate production of ammonium;

[0109] (2) The filtrate from ...

Embodiment 3

[0119] The recovery process from the honeycomb SCR waste catalyst containing tungsten, vanadium and titanium includes the following steps in sequence:

[0120] (1) Contains WO 3 5.22% (wt%), V 2 o 5 0.47% (wt%), TiO 2 80.5% (wt%) of the SCR waste catalyst was washed with high-pressure water to remove ash, crushed by a jaw crusher to a particle size of ≤20cm, and wet-milled by a ball mill until the particle size was 120 mesh; the leaching ball was treated with industrial liquid with a concentration of 670g / l The alkali is leached for 4 hours at 175°C and a pressure of 0.7Mpa, and the ratio of liquid to solid (volume of NaOH solution m 3 : SCR quality t) is 3; leachate and filter residue are obtained after solid-liquid separation, the filter residue is washed with deionized process water, and the washing liquid is merged into the filtrate; the filter residue is used for the production of rutile titanium dioxide, and the filtrate is used for ammonium paratungstate and metavana...

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Abstract

The invention discloses recovery process of honeycomb type selective catalytic reduction (SCR) waste catalyst. The process includes the following steps: a, preprocessing the SCR waste catalyst and leaching at the high temperature and under high pressure; b, adding hydrochloric acid into leaching liquid, adjusting pH, and removing impurities; c, adding hydrochloric acid into the leaching liquid, reacting, calcining and preparing rutile titanium dioxide; d, preparing ammonium paratungstate; e, preparing ammonium metavanadate; and f, recycling and treating waste water. Main products of ammonium paratungstate, ammonium metavanadate and rutile titanium dioxide obtained in the process are high in purity and recovery rate. By-products of silicon magnesium slags, salty mud, high-concentration sodium chloride liquid and barium sulfate dregs are high-purity harmless useful goods. The process is free of harmful secondary pollutant emission, environment-friendly and capable of circulating, has high economical and social benefit and is practicable.

Description

technical field [0001] The invention belongs to the field of recycling SCR waste catalysts, and in particular relates to a recovery process of honeycomb SCR waste catalysts containing tungsten, vanadium and titanium. Background technique [0002] Nitrogen oxide (NOx) is one of the main components of air pollution. 70% of my country's nitrogen oxide emissions come from the direct combustion of coal, and the power industry is a large coal-burning household in my country. Therefore, thermal power plants are responsible for NOx emissions. one of the main sources of . The emission control of nitrogen oxides in power plant flue gas is one of the key tasks of my country's "Twelfth Five-Year Plan". [0003] The current dry flue gas denitrification methods in industry are mainly selective catalytic reduction (SCR, Selective Catalytic Reduction) and selective non-catalytic reduction (SNCR). SNCR does not require a catalyst, but the SCR process requires a catalyst. SCR denitrificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G31/00C01G41/00
Inventor 曾瑞
Owner 曾瑞
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