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Comprehensive utilization method of waste denitration catalyst

A technology of denitration catalyst and reducing agent, applied in vanadium oxide, alkali metal chloride, improvement of process efficiency, etc., can solve problems such as increased cost, environmental harm, waste of effective resources, etc.

Active Publication Date: 2014-08-06
LUOHE XINGMAO TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these waste catalysts are piled up randomly without disposal, on the one hand, it will occupy a large amount of land resources and increase the cost of the enterprise; on the other hand, some toxic and harmful substances adsorbed by the catalyst during use and some Metal elements will enter the natural environment due to various effects, especially water bodies, which will cause serious harm to the environment; thirdly, if the spent catalyst is discarded, the various valuable metal resources contained in it cannot be recycled, which will cause Colossal waste of available resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Adding mass fraction of 40% sulfuric acid solution and sodium sulfite to the waste denitration catalyst crushed to an average particle size of 0.25 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 1.0, the mass ratio of waste denitration catalyst to sodium sulfite is 200, and React at 90°C for 3 hours, and filter to obtain filtrate a and filter residue b;

[0023] 2. Transfer the filter residue b to the raw material warehouse for sulfuric acid titanium dioxide production; add 30% sodium hydroxide solution to the filtrate a, adjust the pH to 7.0, react at 60°C for 150 minutes, and filter to obtain the filtrate c and the filter residue d;

[0024] 3. Evaporate and crystallize the filtrate c to obtain sodium sulfate product; add a sodium hydroxide solution with a mass fraction of 30% to the filter residue d, the mass ratio of the sodium hydroxide solution to the filter residue d is 10, feed oxygen, and react at 60°C 90min, obtain filtrate e...

Embodiment 2

[0028] 1. Add sulfuric acid solution and sodium sulfite with a mass fraction of 45% to the waste denitration catalyst crushed to an average particle size of 0.30 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 2.0, and the mass ratio of waste denitration catalyst to sodium sulfite is 300. React at 110°C for 2 hours, and filter to obtain filtrate a and filter residue b;

[0029] 2. Transport the filter residue b to the raw material warehouse for sulfuric acid titanium dioxide production; add 40% sodium hydroxide solution to the filtrate a, adjust the pH to 8.0, react at 80°C for 120 minutes, and filter to obtain the filtrate c and filter residue d;

[0030] 3. Evaporate and crystallize the filtrate c to obtain the sodium sulfate product; add a 40% sodium hydroxide solution to the filter residue d, the mass ratio of the sodium hydroxide solution to the filter residue d is 9, feed oxygen, and react at 70°C 80min, obtain filtrate e;

[0031] 4. Add ...

Embodiment 3

[0034] 1. Add sulfuric acid solution and sodium sulfite with a mass fraction of 50% to the waste denitration catalyst crushed to an average particle size of 0.30 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 3.0, and the mass ratio of waste denitration catalyst to sodium sulfite is 350. React at 120°C for 2 hours, and filter to obtain filtrate a and filter residue b;

[0035] 2. Transfer the filter residue b to the raw material warehouse for the production of sulfuric acid titanium dioxide; add sodium hydroxide solution with a mass fraction of 45% to the filtrate a, adjust the pH to 9.0, react at 90°C for 90 minutes, and filter to obtain the filtrate c and the filter residue d;

[0036] 3. Evaporate and crystallize the filtrate c to obtain sodium sulfate product; add a sodium hydroxide solution with a mass fraction of 45% to the filter residue d, the mass ratio of the sodium hydroxide solution to the filter residue d is 8, feed oxygen, and react...

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PUM

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Abstract

The invention relates to a comprehensive utilization method of an waste denitration catalyst, and belongs to the field of comprehensive utilization of waste catalysts. The method comprises the following steps: crushing a waste denitration catalyst, and then separating vanadium pentoxide out of the waste denitration catalyst by pickling reduction; carrying out the operations such as enrichment, oxidation, molybdenum precipitation, deamination and the like on the separated vanadium pentoxide, so as to reach the purification target. By adopting the method, the vanadium pentoxide in the waste denitration catalyst can be separated from other metal oxides and is further purified, the material left after the vanadium pentoxide is separated out is used for replacing ilmenite to serve as the raw material for producing titanium dioxide by a sulfuric acid method, thereby reaching the comprehensive utilization of the waste denitration catalyst.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste denitration catalysts, belonging to the field of comprehensive utilization of waste catalysts. Background technique [0002] In my country's energy structure, coal is the main source of energy, and the combustion of coal will produce nitrogen oxides, nitrogen oxides (NO x ) mainly includes NO, NO 2 , N 2 O, etc., will not only form acid rain, but also lead to chemical smog, endangering human health. With the improvement of relevant regulations on emission control, NO x Air pollution has attracted more and more attention. At present, the Selective Catalytic Reduction (SCR) method is considered to be the best flue gas denitrification technology, which has a high denitrification efficiency (up to 90%), and the technology is relatively mature without secondary pollution. more applications. [0003] At present, the SCR method is commonly used as a high-temperature catalyst, which...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01G31/02C01D5/04C01D3/04
CPCY02P10/20
Inventor 张兵兵李俊峰凡广生王学伟李翼然柳少军王亚峰吕海涛郭婷婷卢晓莉李茂恩
Owner LUOHE XINGMAO TITANIUM IND
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