Method for recovering titanium dioxide in spent denitrification catalyst

A denitration catalyst, titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low recovery rate of titanium dioxide, many chemical substances, complicated operation, etc., and it is easier to achieve the total titanium concentration index Control, reduce energy consumption, low cost effect

Active Publication Date: 2017-01-04
安徽迪诺环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the existing method for recovering titanium dioxide in the invalid denitrification catalyst is cumbersome to operate, involves too many reactions, requires more chemical substances to be added, and has high cost, and the recovery rate of titanium dioxide is not high. This provides a method for recovering titanium dioxide in spent denitrification catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: (1), grinding, taking 40 parts by weight of the out-of-stock catalyst that is honeycomb-shaped and grinding to powder and placing it in an open container, adding 10ml of distilled water dropwise to the open container to wet the powder to prevent bottoming; ( 2) Acid hydrolysis, adding 80 parts by weight of concentrated sulfuric acid with a mass fraction of 98% into an open container, heating the open container on an electric furnace to dissolve the powder, and stirring continuously during the heating process to mix the solid and liquid evenly, Stop heating when the solution in the open container is brownish yellow, and wait until the solution is cooled to ≤30°C to obtain titanium liquid; (3), neutralize, take 52ml of milk of lime solution with a mass fraction of 60% and an active calcium content of 80% drop by drop Add dropwise into the titanium solution, shake well while adding, control the temperature of the titanium solution to ≤70°C, fully react and coo...

Embodiment 2

[0020] Embodiment 2: (1), grind, take 40 parts by weight of the out-of-stock catalyst that is honeycomb-shaped and grind to powder and place it in an open container, add 10ml of distilled water dropwise to the open container to wet the powder to prevent bottoming; ( 2) Acid hydrolysis, adding 100 parts by weight of concentrated sulfuric acid with a mass fraction of 98% into an open container, heating the open container on an electric furnace to dissolve the powder, stirring continuously during the heating process to mix the solid and liquid evenly, Stop heating when the solution in the open container is brownish yellow, and wait until the solution is cooled to ≤30°C to obtain titanium liquid; (3), neutralize, take 97ml of milk of lime solution with a mass fraction of 60% and an active calcium content of 80% drop by drop Add dropwise into the titanium solution, shake well while adding, control the temperature of the titanium solution to ≤70°C, fully react and cool to room temper...

Embodiment 3

[0021] Embodiment 3: (1), grind, take 40 parts by weight of the out-of-stock catalyst that is honeycomb-shaped and grind to powder and place it in an open container, add 10ml of distilled water dropwise to the open container to wet the powder to prevent bottoming; ( 2) Acid hydrolysis, adding 120 parts by weight of concentrated sulfuric acid with a mass fraction of 98% into an open container, heating the open container on an electric furnace to dissolve the powder, and stirring continuously during the heating process to mix the solid and liquid evenly, Stop heating when the solution in the open container is brownish yellow, and wait until the solution is cooled to ≤30°C to obtain titanium liquid; (3), neutralize, take 140ml of milk of lime solution with a mass fraction of 60% and an active calcium content of 80% drop by drop Add dropwise into the titanium solution, shake well while adding, control the temperature of the titanium solution to ≤70°C, fully react and cool to room t...

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Abstract

The invention discloses a method for recovering titanium dioxide in an invalid denitrification catalyst, which includes the following steps: (1) Grinding, grinding the invalid out-of-stock catalyst to a powder state and placing it in an open container, adding a proper amount of distilled water dropwise into the open container Prevent bottom formation; (2) Acid hydrolysis, add concentrated sulfuric acid with a mass fraction of 98% into an open container, heat the open container to dissolve the powder, keep stirring during the heating process to mix the solid and liquid evenly, when the open container Stop heating when the solution turns brown, and cool to ≤30°C to obtain titanium liquid; (3), neutralize, add a lime milk solution with a mass fraction of 50%‑80% and an active calcium content of 80% to the titanium liquid drop by drop During the process, shake well while adding dropwise, control the temperature of the titanium solution to ≤70°C, and cool to room temperature after fully reacting; (4) Concentrate and hydrolyze, concentrate the neutralized titanium solution to 195‑205g / l, add seed crystals and heat Hydrolysis; (5), filtering and rinsing; (6), drying and calcination.

Description

technical field [0001] The invention relates to a method for recovering titanium dioxide, in particular to a method for recovering titanium dioxide in an exhausted denitration catalyst. Background technique [0002] The denitrification catalyst has large specific surface area, high catalytic activity, stable chemical properties, and long service life. Titanium dioxide for denitrification catalyst is the carrier material of SCR denitrification catalyst. It is mainly used to reduce nitrogen oxides. It is specially used for exhaust gas in power plants, oil refining, coking and other plants. Denitrification. However, the denitrification catalyst will generally be deactivated after three years of use, or the catalytic efficiency will be greatly reduced, unable to meet the denitrification index requirements, or poisoned and invalidated during use. At this time, the denitration catalyst must be replaced immediately, and the main ways to dispose and utilize the replaced spent catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 荚玉冬韩军军赵义凯
Owner 安徽迪诺环保新材料科技有限公司
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