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Method for recycling titanium dioxide in waste SCR (Selective Catalytic Reduction) denitration catalyst

A denitration catalyst and titanium recovery technology, applied in chemical recovery, titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as waste of resources and achieve the effect of avoiding excess

Active Publication Date: 2013-06-05
江苏万德环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, waste catalysts are basically disposed of by landfill, resulting in a large waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The method for reclaiming titanium dioxide from the waste SCR denitration catalyst of the present invention comprises the following steps successively:

[0015] (1) Purging the waste SCR denitrification catalyst with compressed air to remove dust;

[0016] (2) Grinding and pulverizing the waste SCR denitrification catalyst after dedusting to obtain a catalyst powder with a particle size of 50 μm;

[0017] (3) Take 100 parts by weight of the above-mentioned catalyst powder and place it in an acidolysis pot, then add 140 parts by weight of concentrated sulfuric acid to acidify it to obtain a concentrated solution of titanyl sulfate, and the reaction process is TiO 2 +H 2 SO 4 =TiOSO 4 +H 2 0, then inject 90 parts by weight of water into the titanyl sulfate concentrated solution to obtain a titanyl sulfate dilute solution; and the WO in the spent SCR denitration catalyst 3 and V 2 o 5 Does not react with concentrated sulfuric acid;

[0018] (4) Add 0.3 parts by wei...

Embodiment 2

[0024] The method for reclaiming titanium dioxide from the waste SCR denitration catalyst of the present invention comprises the following steps successively:

[0025] (1) Purging the waste SCR denitrification catalyst with compressed air to remove dust;

[0026] (2) Grinding and pulverizing the waste SCR denitrification catalyst after dedusting to obtain catalyst powder with a particle size of 80 μm;

[0027] (3) Take 100 parts by weight of the above-mentioned catalyst powder and place it in an acidolysis pot, then add 150 parts by weight of concentrated sulfuric acid to acidify it to obtain a concentrated solution of titanyl sulfate, and the reaction process is TiO 2 +H 2 SO 4 =TiOSO 4 +H 2 0, then inject 100 parts by weight of water into the titanyl sulfate concentrated solution to obtain a titanyl sulfate dilute solution; and the WO in the spent SCR denitration catalyst 3 and V 2 o 5 Does not react with concentrated sulfuric acid;

[0028] (4) Add 0.4 parts by weig...

Embodiment 3

[0034] The method for reclaiming titanium dioxide from the waste SCR denitration catalyst of the present invention comprises the following steps successively:

[0035] (1) Purging the waste SCR denitrification catalyst with compressed air to remove dust;

[0036] (2) Grinding and pulverizing the spent SCR denitrification catalyst after dedusting to obtain catalyst powder with a particle size of 100 μm;

[0037] (3) Take 100 parts by weight of the above-mentioned catalyst powder and place it in an acidolysis pot, then add 160 parts by weight of concentrated sulfuric acid to acidify it to obtain a concentrated solution of titanyl sulfate, and the reaction process is TiO 2 +H 2 SO 4 =TiOSO 4 +H 2 0, then inject 110 parts by weight of water into the titanyl sulfate concentrated solution to obtain a titanyl sulfate dilute solution; and the WO in the spent SCR denitration catalyst 3 and V 2 o 5 Does not react with concentrated sulfuric acid;

[0038] (4) Add 0.5 parts by wei...

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Abstract

The invention relates to a method for recycling titanium dioxide in a waste SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps of: firstly removing dust from the waste denitration catalyst, pulverizing, then adding concentrated sulfuric acid so as to carry out acid hydrolysis on the waste denitration catalyst to obtain a concentrated titanyl sulfate solution, and adding water for dilution; adding a non-ionic emulsifier serving as a flocculating agent and a sulfonate surface active agent or a polycarboxylate surface active agent as a coagulant aid, and adding water-solubility methyl silicone oil; pumping into a plate-and-frame filter press for filter pressing, carrying out vacuum concentration on filtrate, then heating to 90 DEG C to 98 DEG C, and maintaining for 5.5 hours so as to hydrolyze the filtrate; cooling a hydrolysis product to 40 DEG C, and carrying out vacuum filtration so as to sediment out metatitanic acid; rinsing with sand-filtered water and deionized water, and adding potassium carbonate or phosphorous acid to obtain metatitanic acid filter cakes; and drying the filter cakes, calcining at 500-800 DEG C, and then pulverizing to obtain a titanium dioxide finished product. The method has the advantages of being capable of reducing disposal amount of the waste denitration catalyst, recycling the waste denitration catalyst and reducing the production cost of the waste denitration catalyst.

Description

technical field [0001] The invention relates to a method for recovering titanium dioxide, in particular to a method for recovering titanium dioxide from waste SCR denitration catalysts. Background technique [0002] Titanium dioxide (commonly known as titanium dioxide) has great application value in various fields, and is widely used in the manufacture of coatings, high-grade white paint, white rubber, synthetic fibers, welding electrodes, denitration catalysts, etc. [0003] The traditional process is that titanium dioxide is extracted from titanium concentrate, and the content of titanium dioxide in titanium concentrate is generally 40% to 60%. The main component of the denitrification catalyst is anatase titanium dioxide, with a content of about 90%. It is mainly produced by the sulfuric acid method, and the direct production cost is about 12,000 yuan / ton. With the vigorous rise of the denitrification industry, the demand for titanium dioxide in the denitrification catal...

Claims

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Application Information

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IPC IPC(8): C01G23/047
CPCY02P20/584
Inventor 华攀龙李守信于光喜颜少云许峰华杰周枫林
Owner 江苏万德环保科技有限公司
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