Method for preparing titanium dioxide from waste honeycomb denitration catalyst

A denitration catalyst and honeycomb technology, which is applied in the field of waste honeycomb denitration catalyst to prepare titanium dioxide, can solve the problems of aggravating the greenhouse effect, cumbersome process flow of by-products, high investment, etc., achieving simple process flow, avoiding excessive consumption, The effect of less investment

Inactive Publication Date: 2019-11-05
SHANDONG DAWN TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above technologies provide a variety of methods for recovering titanium dioxide from waste denitration catalysts, the above methods generally require additional construction of new plant equipment, high investment, and the use of a large amount of dilute sulfuric acid, lye or sodium carbonate in the production process , produce additional by-products and the process is cumbersome, and the sodium roasting method will also produce a large amount of carbon dioxide during the production process, which will aggravate the greenhouse effect

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  • Method for preparing titanium dioxide from waste honeycomb denitration catalyst

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Embodiment 1

[0030] A method for preparing titanium dioxide from waste honeycomb denitration catalyst, comprising the following steps:

[0031] a. Pretreatment: Mix 1 part of waste honeycomb denitrification catalyst with a titanium dioxide content of 82% and 6 parts of high-titanium slag with a titanium dioxide content of 90% in a certain proportion, use a ray mill to crush and grind until passing through a 325-mesh sieve, and sieve Shangwu 5%;

[0032] b. Acid hydrolysis: use the solid-phase acid hydrolysis method, put the pretreated powder into the acid hydrolysis reaction kettle, add concentrated sulfuric acid, adjust the liquid-solid ratio to 1.75, and use 0.15MPa compressed air to stir, so that the titanium-containing powder and sulfuric acid are fully mixed , the reaction acid concentration is 93%, and the acid hydrolysis time is 3h;

[0033] c. Sedimentation and impurity removal: 700g flocculant / m 3 Proportion of titanium liquid Add flocculant-modified polyacrylamide to the titani...

Embodiment 2

[0038] A method for preparing titanium dioxide from waste honeycomb denitration catalyst, comprising the following steps:

[0039] a. Pretreatment: Mix 1 part of waste honeycomb denitration catalyst with a titanium dioxide content of 85% and 9 parts of high-titanium slag with a titanium dioxide content of 83% in a certain proportion, use a ray mill to crush and grind until passing through a 325-mesh sieve, and sieve Shangwu 7%;

[0040] b. Acidolysis: adopt the solid-phase acidolysis method, put the pretreated powder into the acidolysis reaction kettle, add the waste acid recovered in Example 1, adjust the liquid-solid ratio to 1.9, and use 0.2MPa compressed air to stir to make the The titanium powder is fully mixed with sulfuric acid, the reaction acid concentration is 90%, and the acid hydrolysis time is 2.5h;

[0041]c. Sedimentation and impurity removal: according to 500g flocculant / m 3 Proportion of titanium liquid Add flocculant-modified polyacrylamide to the acid-hydr...

Embodiment 3

[0046] A method for preparing titanium dioxide from waste honeycomb denitration catalyst, comprising the following steps:

[0047] a. Pretreatment: Mix 1 part of waste honeycomb denitrification catalyst with 90% titanium dioxide content and 7 parts of high-titanium slag with 90% titanium dioxide content in a certain proportion, use a ray mill to crush and grind until passing through a 325 mesh sieve, and sieve Shangwu 3%;

[0048] b. Acid hydrolysis: use the solid-phase acid hydrolysis method, put the pretreated powder into the acid hydrolysis reaction kettle, add concentrated sulfuric acid, adjust the liquid-solid ratio to 1.7, and stir with 0.25MPa compressed air to fully mix the titanium-containing powder and sulfuric acid , the reaction acid concentration is 92%, and the acid hydrolysis time is 3h;

[0049] c. Sedimentation and impurity removal: 200g flocculant / m 3 Proportion of titanium liquid Add flocculant-modified polyacrylamide to the acid-hydrolyzed titanium liquid...

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Abstract

The invention discloses a method for preparing titanium dioxide from a waste honeycomb denitration catalyst. The method comprises the steps of pretreatment, acidolysis, sedimentation and impurity removal, seed crystal preparation, metatitanic acid preparation by hydrolysis, titanium dioxide preparation and the like. Preparation of the titanium dioxide from the waste honeycomb denitration catalystis combined to a production process for preparing titanium dioxide by an existing sulfuric acid method, existing production equipment is utilized fully, investment on new plant equipment is reduced, meanwhile, the recovery rate of the titanium dioxide is high, and the product meets the production requirement. According to the method, an additional seed crystal hydrolysis process is adopted, pH ofthe slurry is controlled to maintain strong acidity, removal of impurities is facilitated, waste acid generated by hydrolysis can be recycled, and economic and environmental benefits are high.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production and manufacturing, and in particular relates to a method for preparing titanium dioxide from waste honeycomb denitration catalysts. Background technique [0002] In recent years, with the development of my country's flue gas denitrification industry, SCR denitrification catalysts for the treatment of atmospheric pollutants NOx will face severe problems in the disposal of spent catalysts. The main types of denitrification catalysts are honeycomb type, plate type and corrugated type. The honeycomb type catalyst has a large surface area, high activity and small volume. It currently occupies 80% of the market share. V 2 o 5 , WO 3 or MoO 3 ,TiO 2 At present, most of the metals in China are still treated by landfill. On the one hand, it will cause waste of rare metal resources. Heavy metal elements will enter the natural environment due to various effects, causing serious harm to the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0534C01P2006/80
Inventor 张盈盈于耀杰陈大爱
Owner SHANDONG DAWN TITANIUM IND
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