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
CN110407249AInactive Publication Date: 2019-11-05SHANDONG DAWN TITANIUM IND
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG DAWN TITANIUM IND
Publication Date
2019-11-05
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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