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Acid leaching reducing method for comprehensive utilization of waste denitration catalyst

A denitrification catalyst and acid leaching technology, applied in the fields of vanadium oxide, chemical recovery, titanium dioxide, etc., can solve the problems of effective resource waste, waste catalyst discarding, environmental hazards, etc., and achieve the effect of comprehensive utilization and simple process

Inactive Publication Date: 2015-05-27
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

[0020] (1) Add sulfuric acid with a mass fraction of 8% to the waste denitration catalyst crushed to an average particle size of 0.25mm until the pH of the solution is 2, then add sodium sulfite, the mass ratio of waste denitration catalyst to sodium sulfite is 200, and react at 90°C 3 hours, filtered to obtain filtrate a and filter residue b;

[0021] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid process titanium dioxide production; add ammonia water to the filtrate a, adjust the pH of the solution to 4.0, react at 60°C for 90 minutes, and filter to obtain the filter residue c;

[0022] (3) Add nitric acid solution with a mass fraction of 17% to the filter residue c until the pH of the solution is 4, heat to boiling for 20 minutes, and filter to obtain vanadium pentoxide, the content of which is 78%.

Embodiment 2

[0024] (1) Add sulfuric acid with a mass fraction of 15% to the waste denitrification catalyst crushed to an average particle size of 0.30mm until the pH of the solution is 3, then add potassium sulfite, the mass ratio of waste denitrification catalyst to potassium sulfite is 300, at 120 Under the condition of ℃, react for 1 hour, and filter to obtain filtrate a and filter residue b;

[0025] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid process titanium dioxide production; add potassium hydroxide to the filtrate a, adjust the pH of the solution to 5.0, react at 80°C for 70 minutes, and filter to obtain the filter residue c;

[0026] (3) Add 20% nitric acid solution to the filter residue c until the pH of the solution is 4, heat to boiling for 20 minutes, and filter to obtain vanadium pentoxide, the content of which is 78%.

Embodiment 3

[0028] (1) To the waste denitration catalyst crushed to an average particle size of 0.25mm, add hydrochloric acid with a mass fraction of 17% until the pH of the solution is 2, then add sodium bisulfite, the mass ratio of waste denitration catalyst to sodium bisulfite is 200, React at 90°C for 3 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 sodium hydroxide to the filtrate a, adjust the pH of the solution to 4.0, react at 60°C for 90 minutes, and filter to obtain the filter residue c;

[0030] (3) Add nitric acid solution with a mass fraction of 25% to the filter residue c until the pH of the solution is 4, heat to boiling for 30 minutes, and filter to obtain vanadium pentoxide, the content of which is 78%.

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Abstract

The invention claims an acid leaching reducing method for comprehensive utilization of waste denitration catalyst. The method comprises the following steps: crushing waste denitration catalyst, then adding hydrochloric acid or sulfuric acid liquor into the waste denitration catalyst, adding a reducing agent at the same time, heating for leaching, filtering to obtain acid leaching filtrate, and adjusting the pH (potential of hydrogen) of the acid leaching filtrate by alkali liquor, so as to obtain crude vanadium product; and finally dissolving the crude vanadium precipitate into a certain concentration of nitrite acid solution, boiling for oxidation reaction, namely generating vanadium pentoxide products in the solution. The process of the method is simple, the purity of the recovered vanadium pentoxide reaches 78%, the recovery rate of vanadium pentoxide reaches 83%, then the materials form which the vanadium pentoxide products are separated out are used as raw materials for replacing titanic iron ore to produce titanium dioxide by a sulfuric acid method, so as to realize the comprehensive utilization of waste denitration catalyst.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste denitration catalysts, in particular to an acid leaching reduction method for comprehensive utilization of waste denitration 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 cause chemical smog, endangering human health, NO x People pay more and more attention to air pollution, and the laws and regulations on controlling emissions are also improving day by day. 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 meth...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01G23/053
CPCY02P20/584
Inventor 张兵兵柳少军李俊峰王学伟张海星史利涛贺小五刘松贺赵海鹏于丹丹李茂恩
Owner LUOHE XINGMAO TITANIUM IND
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