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A method and device for recovering ti and w from waste flue gas denitrification catalyst

A denitration catalyst and waste flue gas technology, applied in chemical recovery, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of reagent waste, low extraction purity and extraction efficiency, and high energy consumption.

Active Publication Date: 2018-03-09
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for recovering Ti and W 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, as well as the method of treating with lye and then treating with acid, the waste of reagents is serious, and TiO 2 and WO 3 The problem of low extraction purity and extraction efficiency

Method used

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  • A method and device for recovering ti and w from waste flue gas denitrification catalyst
  • A method and device for recovering ti and w from waste flue gas denitrification catalyst

Examples

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Effect test

Embodiment 1

[0048] Embodiment 1 of the present invention: a method for recovering Ti and W from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0049] 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;

[0050] S02, use a high-pressure water gun to flush the catalyst after dust removal, the flushing time of each module is 15-20min, and the pressure is 8-12Mpa, to further remove the dust in the channel;

[0051] S03, drying the washed catalyst;

[0052] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution, which specifically includes the following steps:

[0053] S11, crushing the catalyst into catalyst powder of 160-180 mesh;

[0054] S12, put the catalyst powder into the acid hydrolysis tank made of lead, add 88%-90% concentrated sulfuric acid accord...

Embodiment 2

[0066]Embodiment 2: a kind of method that reclaims Ti and W from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0067] 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;

[0068] S02, use a high-pressure water gun to flush the catalyst after dust removal, the flushing time of each module is 20-25min, and the pressure is 5-8Mpa, to further remove the dust in the channel;

[0069] S03, drying the washed catalyst;

[0070] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution, which specifically includes the following steps:

[0071] S11, crushing the catalyst into 180-200 mesh catalyst powder;

[0072] S12, put the catalyst powder into a lead-made acidolysis tank, add 85% to 88% concentrated sulfuric acid according to the weight ratio ...

Embodiment 3

[0084] Embodiment 3: a kind of method that reclaims Ti and W from waste flue gas denitrification catalyst, such as figure 1 shown, including the following steps:

[0085] 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;

[0086] S02, use a high-pressure water gun to flush the catalyst after dust removal. The flushing time of each module is 25-30min, and the pressure is 7-10Mpa to further remove the dust in the channel;

[0087] S03, drying the washed catalyst;

[0088] S1, pulverizing the catalyst and adding concentrated sulfuric acid for acidolysis, adding water after acidolysis to obtain a titanyl sulfate solution, which specifically includes the following steps:

[0089] S11, pulverizing the catalyst into 190 mesh catalyst powder;

[0090] S12, put the catalyst powder into a lead-made acidolysis tank, add 90% to 92% concentrated sulfuric acid according to the weight ratio of c...

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Abstract

The invention discloses a method and device for recycling Ti and W from a waste flue gas denitrification catalyst. The method comprises the steps that 1, the catalyst is smashed, concentrated sulfuric acid is added for acidolysis, and water is added after acidolysis is performed to obtain a titanyl sulfate solution; 2, the titanyl sulfate solution is filtered, filter residues are collected for use, and a filtrate is heated and concentrated for hydrolysis to obtain a hydrolysis product; 3, the hydrolysis product is filtered to obtain a filtrate and metatitanic acid sedimentation; 4, salt treatment, drying and roasting are performed on the metatitanic acid sedimentation to obtain a finished product TiO2; 5, excessive ammonium hydroxide is added into the filter residues in the second step, and filtering is performed, and the filtrate is heated to generate ammonium paratungstate crystals; the ammonium paratungstate crystals are dried and roasted to obtain pure WO3. The method can recycle pure TiO2 and WO3 from the waste flue gas denitrification catalyst. After the method is adopted, the recycling efficiency of TiO2 and the recycling efficiency of WO3 reach 95% and 93% respectively, and the purity of TiO2 and the purity of WO3 can reach 99% and 90% respectively.

Description

technical field [0001] The invention relates to a method and a device for recovering Ti and W 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 denitration cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02C01G23/053C04B35/66
CPCY02P20/584
Inventor 苏军划沈煜晖付丽辉李苇林
Owner CHINA HUADIAN ENG
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