A method and device for recovering tungsten trioxide from waste flue gas denitration catalyst

A technology of denitrification catalyst and tungsten trioxide, which is applied to the removal of tungsten oxide/tungsten hydroxide and solid waste, can solve the problems of low extraction purity and extraction efficiency, unsuitable for industrial production, and waste of reagents, etc., and achieve low cost, The method is simple and convenient, and the effect of saving resources

Active Publication Date: 2017-07-28
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for recovering tungsten trioxide from waste flue gas denitrification catalysts, which can effectively solve the problems in the prior art, especially the high-temperature roasting method consumes more energy and is not suitable for industrialization Production, and the method reagent waste of treating with lye and then acid solution is serious, WO 3 The problem of low extraction purity and extraction efficiency

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  • A method and device for recovering tungsten trioxide from waste flue gas denitration catalyst
  • A method and device for recovering tungsten trioxide from waste flue gas denitration catalyst

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Embodiment 1

[0038] Embodiment 1 of the present invention: a method for recovering tungsten trioxide from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0039] S01, blow the waste flue gas denitrification catalyst with compressed air for 20-23 minutes for each module to remove the dust in the channel;

[0040] S02, wash the catalyst after dust removal with a high-pressure water gun, wash each module for 15-20min, and the pressure is 8-12Mpa, and further remove the dust in the channel;

[0041] S03, drying the washed catalyst;

[0042] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution; specifically including the following steps:

[0043] S11, crushing the catalyst into catalyst powder of 160-180 mesh;

[0044] S12, put the catalyst powder into the acid hydrolysis tank made of lead, add 88%-90% concentrated sulfuric acid according to the we...

Embodiment 2

[0049] Embodiment 2: a kind of method that reclaims tungsten trioxide from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0050] S01, blow the waste flue gas denitrification catalyst with compressed air, and blow each module for 15-20 minutes to remove the dust in the channel;

[0051] S02, rinse the catalyst after dust removal with a high-pressure water gun, and rinse each module for 20-25 minutes, with a pressure of 5-8Mpa, to further remove the dust in the channel;

[0052] S03, drying the washed catalyst;

[0053] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution; specifically including the following steps:

[0054] S11, crushing the catalyst into 180-200 mesh catalyst powder;

[0055] S12, put the catalyst powder into a lead-made acidolysis tank, add 85% to 88% concentrated sulfuric acid according to the weight ratio of ...

Embodiment 3

[0060] Embodiment 3: a kind of method that reclaims tungsten trioxide from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0061] S01, blow the waste flue gas denitrification catalyst with compressed air for 23 to 30 minutes for each module to remove the dust in the tunnel;

[0062] S02, rinse the catalyst after dust removal with a high-pressure water gun, and rinse each module for 25 to 30 minutes, with a pressure of 7 to 10Mpa, to further remove the dust in the channel;

[0063] S03, drying the washed catalyst;

[0064] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution; specifically including the following steps:

[0065] S11, pulverizing the catalyst into 190 mesh catalyst powder;

[0066] S12, put the catalyst powder into a lead-made acidolysis tank, add 90% to 92% concentrated sulfuric acid according to the weight ratio o...

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Abstract

The invention discloses a method and device for recovering tungsten trioxide from a waste flue gas denitrification catalyst. The method includes: S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after the acidolysis to obtain a titanyl sulfate solution ; S2, filter the titanyl sulfate solution, add excess ammonia water to the filter residue for reaction, and perform secondary filtration; S3, heat the filtrate obtained from the secondary filtration to generate ammonium paratungstate crystals; dry and calcinate the ammonium paratungstate crystals to obtain pure WO 3 . The present invention can obtain pure WO 3 ; And according to a large number of data statistics show that after adopting the scheme of the present invention, WO 3 The recovery efficiency can reach 93%, and the purity can reach 90%. The recovery technology of the present invention does not need high-temperature roasting, so it is relatively energy-saving and suitable for industrial production. At the same time, the present invention adopts acid treatment, no reagent waste, and effectively saves resources.

Description

technical field [0001] The invention relates to a method and a device for recovering tungsten trioxide from a waste flue gas denitrification catalyst, and belongs to the technical field of waste flue gas denitrification catalyst recovery. Background technique [0002] SCR denitrification technology is a necessary means for power plants to achieve ultra-clean emissions. As the core part of SCR denitrification technology, the catalyst will lose its activity due to wear or blockage during operation. Partially regenerable catalysts can continue to be used after regeneration, while non-regenerable catalysts face the situation of rational utilization and disposal (even if regenerable catalysts are regenerated 2 to 3 times, they cannot be regenerated and need to be rationally utilized and disposed of). At present, landfill is the way to dispose of waste denitration catalysts in foreign countries, but there are many thermal power plants in my country, and the amount of waste denitra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B09B3/00
Inventor 李苇林苏军划胡永锋李伟
Owner CHINA HUADIAN ENG
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