Acid leaching ion exchange method for comprehensively using waste denitration catalyst

A denitrification catalyst and ion exchange technology, which is applied in the field of comprehensive utilization of waste denitrification catalysts, can solve the problems of waste of effective resources, increased costs, environmental hazards, etc., and achieve the effect of comprehensive utilization

Inactive Publication Date: 2015-05-06
ZHONGZHOU UNIV +1
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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) Add sulfuric acid solution and sodium sulfite with a mass fraction of 40% to the waste denitration catalyst crushed to an average particle size of 0.15 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 2.0, the mass ratio of waste denitration catalyst to sodium sulfite is 200, and heat to Boil and continue for 2 hours, filter to obtain filtrate a and filter residue b;

[0023] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid process titanium dioxide production; add sodium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to sodium chlorate is 100, add sulfuric acid to adjust the pH of the solution to 3.0, heat and boil until the solution turns yellow , and then the solution was cooled to 15°C;

[0024] (3) Pass the cooled solution through the 717 ion exchange resin column, the flow rate is controlled at 0.03 mL / min·mL, and then use NaOH+NaCl solution as the eluent to rinse the 7...

Embodiment 2

[0028] (1) Add sulfuric acid solution and potassium sulfite with a mass fraction of 50% 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 3.0, and the mass ratio of waste denitration catalyst to potassium sulfite is 300, heated to boiling and continued for 2 hours, filtered 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 potassium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to potassium chlorate is 200, add sulfuric acid to adjust the pH of the solution to 4.0, heat and boil until the solution turns yellow, and then dissolve the solution Cool to 35°C;

[0030] (3) Pass the cooled solution through the 717 ion exchange resin column, the flow rate is controlled at 0.06 mL / min·mL, and then use NaOH+NaCl solution as the eluent ...

Embodiment 3

[0034] (1) Add hydrochloric acid solution and sodium bisulfite 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 hydrochloric acid solution to waste denitration catalyst is 4.0, and the mass fraction of waste denitration catalyst and sodium bisulfite Ratio is 350, heated to boiling and continued for 2 hours, filtered to obtain filtrate a and filter residue b;

[0035] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid titanium dioxide production; add sodium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to sodium chlorate is 250, add hydrochloric acid to adjust the pH of the solution to 3.0, heat and boil until the solution turns yellow , and then the solution was cooled to 15°C;

[0036] (3) Pass the cooled solution through the 901 ion exchange resin column, the flow rate is controlled at 0.09 mL / min mL, and then use NaOH+NaCl solution as...

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Abstract

The invention discloses an acid leaching ion exchange method for comprehensively using a waste denitration catalyst. The method comprises the following steps: crushing the waste denitration catalyst; then adding acid liquor into the waste denitration catalyst; adding a reducing agent to leach; adding an oxidizing agent into a filtered acid leaching filtrate to oxidize tetravalent vanadium to pentavalent vanadium; adjusting the pH value of a pentavalent vanadium solution, wherein the existing form of pentavalent vanadium is multi-vanadate anions; enriching and removing vanadium by using ion exchange resin; then removing vanadium by using sodium hydroxide and sodium chloride as eluting liquids, wherein the vanadium ions enter into a spray liquid; adding acid into the spray liquid to adjust the pH of the spray liquid; and recovering vanadium pentoxide by molybdenum precipitation and deamination. The purity of vanadium pentoxide recovered by the method reaches 99%, the recovery rate of vanadium pentoxide reaches 91%, and a material without vanadium pentoxide is used as a raw material for producing titanium dioxide by virtue of a sulfuric acid method by replacing ilmenite, so that comprehensive utilization of the waste denitration catalyst is realized.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste denitration catalysts, in particular to an acid leaching ion exchange 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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C01G23/053
Inventor 凡广生李俊峰张兵兵孙学习柳少军史利涛王亚峰李翼然于丹丹刘松贺卢晓莉贺小五李茂恩
Owner ZHONGZHOU UNIV
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