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Preparation method of vanadyl sulfate solution for regenerating inactivated denitration catalyst

A technology of vanadyl sulfate solution and denitrification catalyst, which is applied in chemical instruments and methods, vanadium compounds, chemical recovery, etc., can solve the problems of complicated steps and high cost, and achieve the effect of easy realization, low sodium content and low iron content

Inactive Publication Date: 2021-03-26
PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method steps are complicated and the cost is high

Method used

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preparation example Construction

[0017] The preparation method of the vanadyl sulfate solution for regeneration of the deactivated denitrification catalyst of the present invention comprises the following steps: a, adding ammonium vanadate to water and stirring for beating; b, adding sulfuric acid and stirring evenly; c, adding a reducing agent to carry out reduction under heating and stirring conditions Reaction; d. Solid-liquid separation after the reaction, to obtain the target product vanadyl sulfate solution and residue; e. The residue is mainly unreacted ammonium vanadate, which can be returned to the next cycle for processing.

[0018] The reaction that each step of the present invention takes place is as follows:

[0019] b decomposes ammonium vanadate: (NH 4 ) 2 V 6 o 16 +4H 2 SO 4 = 3 (VO 2 ) 2 SO 4 +(NH 4 ) 2 SO 4 +4H 2 O, to obtain vanadyl sulfate (Ⅴ) solution

[0020] c Pentavalent vanadium is reduced to tetravalent vanadium to obtain a mixed solution of vanadyl sulfate (Ⅳ) and ammon...

Embodiment 1

[0031] Take 415ml of water and put it into a 1000ml glass beaker, start in an electric heating water bath, start stirring at a speed of 200 rpm; add 100g of ammonium metavanadate (dry basis) evenly within 5min for beating, and evenly add 98% of the ammonium metavanadate within 10min Acidification treatment with 128g of concentrated sulfuric acid; add 54.0g of oxalic acid evenly within 20min, turn on the electric heating switch of the water bath to start heating, set the heating temperature at 50°C, and heat for 180min; add water during the reaction to maintain the solution in the beaker at 435ml; Finish, turn off heating switch, stop stirring, carry out solid-liquid separation, obtain vanadyl sulfate solution 430ml and trace residue.

[0032] The analysis results showed that the vanadyl sulfate (VOSO) in the vanadyl sulfate solution 4 ) content of 31.8%, solution density of 1.38g / ml, vanadium recovery rate of 99.85%.

Embodiment 2

[0034] Take 500ml of water and put it into a 1000ml glass beaker, start in an electric heating water bath, start stirring at a speed of 250 rpm; add 100g of ammonium polyvanadate (dry basis) evenly within 5min for beating, and evenly add 98% of the ammonium polyvanadate within 10min Acidification treatment with 117g of concentrated sulfuric acid; uniformly add 64.5g of oxalic acid within 20min; turn on the electric heating switch of the water bath to start heating, set the heating temperature to 70°C, and heat for 150min; add water during the reaction to maintain the solution volume in the beaker at 515ml; Finish, turn off heating switch, stop stirring, carry out solid-liquid separation, obtain vanadyl sulfate solution 505ml and trace residue.

[0035] The analysis results showed that the vanadyl sulfate (VOSO) in the vanadyl sulfate solution 4 ) content of 32.3%, solution density of 1.36g / ml, vanadium recovery rate of 99.82%.

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Abstract

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a preparation method of a vanadyl sulfate solution for regenerating an inactivated denitration catalyst. The preparation method comprises the steps of pulping ammonium vanadate and water, acidifying with sulfuric acid, reducing with a reducing agent, and carrying out solid-liquid separation to obtain the vanadyl sulfate solution and residues. The method is simple to operate, the vanadium raw material for reaction is simple and easy to obtain, and the yield of vanadium is high; full-wet operation is carried out, and ammonia-nitrogen wastewater and waste gas are not produced; and the method has a wide application prospect in the increasing regeneration of the inactivated denitration catalyst.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a preparation method of a vanadyl sulfate solution for regeneration of a deactivated denitrification catalyst. Background technique [0002] At present, flue gas denitrification is a conventional method for treating nitrogen oxides. In the denitrification process, vanadium-containing denitrification catalysts are required. After repeated use, the denitrification catalysts will lose their catalytic activity, referred to as deactivation. The deactivated denitration catalyst can be regenerated with vanadyl sulfate solution, which has become a common method to prolong the service life of denitration catalyst and reduce the cost of denitration. The main component of the used vanadyl sulfate solution of this method is: 32 ± 3% VOSO 4 , Fe≤0.15%, K≤0.10%, Na≤0.15%, solution density 1.36~1.47g / ml. [0003] The existing vanadyl sulfate is prepared by the acidificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
CPCC01G31/00Y02P20/584
Inventor 李千文汪超王英
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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