Recycling method for waste denitration catalyst

A denitration catalyst and recycling technology, applied in the fields of tungsten, vanadium and titanium metal oxide recovery respectively, can solve the problems of waste water, waste gas and waste residue, discouragement and other problems, achieve less discharge of three wastes, short production process, economical easy effect

Inactive Publication Date: 2014-10-15
CECEP L&T ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses the sulfuric acid method to recover titanium dioxide. The process is relatively mature, but it will produce waste water, waste gas and waste residue, which is a technical method not encouraged by the state.

Method used

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  • Recycling method for waste denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) After the waste denitration catalyst is purged and dust-cleaned, it is crushed with a jaw crusher, and then crushed into a 100-200-mesh powder with a pulverizer;

[0022] (2) Add the waste denitrification catalyst powder to a strong alkali solution with a mass percentage of 30%, and at the same time add 1% hydrogen peroxide solution, react at a temperature of 80°C and a stirring speed of 500 rpm for 4 hours, and centrifuge Obtain titanium-rich material and a solution containing sodium vanadate, sodium tungstate, sodium silicate and sodium metaaluminate, and the mass ratio of waste denitration catalyst powder to strong base is 2:2;

[0023] (3) fully mix the titanium-rich material and petroleum tar obtained in step (2), react the mixture of titanium-rich material and petroleum tar with chlorine gas, generate titanium tetrachloride flue gas, TiO in the titanium-rich material in this reaction 2 The molar ratio of petroleum tar (C) is 1:1, TiO 2 The molar ratio of chlo...

Embodiment 2

[0027] (1) After the waste denitration catalyst is purged and dust-cleaned, it is crushed with a jaw crusher, and then crushed into a 100-200-mesh powder with a pulverizer;

[0028] (2) Add the waste denitrification catalyst powder to a strong alkali solution with a mass percentage of 30%, and at the same time add 1% hydrogen peroxide solution, react at a temperature of 85°C and a stirring speed of 550 rpm for 4.5 hours, and centrifuge Obtain titanium-rich material and a solution containing sodium vanadate, sodium tungstate, sodium silicate and sodium metaaluminate, and the mass ratio of waste denitration catalyst powder to strong base is 2:1.5;

[0029] (3) fully mix the titanium-rich material and petroleum tar obtained in step (2), react the mixture of titanium-rich material and petroleum tar with chlorine gas, generate titanium tetrachloride flue gas, TiO in the titanium-rich material in this reaction 2 And the molar ratio of petroleum tar (C) is 1:1.5, TiO 2 The molar rat...

Embodiment 3

[0033] (1) After the waste denitration catalyst is purged and dust-cleaned, it is crushed with a jaw crusher, and then crushed into a 100-200-mesh powder with a pulverizer;

[0034] (2) Add the waste denitrification catalyst powder to a strong alkali solution with a mass percentage of 30%, and at the same time add 1% hydrogen peroxide solution, and react for 5.0 hours at a temperature of 90°C and a stirring speed of 600 rpm, and centrifuge Obtain titanium-rich material and a solution containing sodium vanadate, sodium tungstate, sodium silicate and sodium metaaluminate, and the mass ratio of waste denitration catalyst powder to strong base is 2:1;

[0035] (3) fully mix the titanium-rich material and petroleum tar obtained in step (2), react the mixture of titanium-rich material and petroleum tar with chlorine gas, generate titanium tetrachloride flue gas, TiO in the titanium-rich material in this reaction 2 The molar ratio of petroleum tar (C) is 1:2, TiO 2 The molar ratio w...

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Abstract

A recycling method for waste denitration catalyst is characterized by comprising the following steps: (1) the waste denitration catalyst is smashed into powder of 100 to 200 meshes; (2) the powder reacts with an alkali solution under a heating and stirring condition to obtain a titanium-rich material and a solution containing elements such as vanadium, tungsten, silicon and aluminum; (3) the titanium-rich material reacts with chlorine gas to generate titanium tetrachloride, then the titanium tetrachloride is condensed and reacts with oxygen to generate titanium dioxide, and the titanium dioxide is treated with surface finish and drying to obtain a titanium dioxide finished product; (4) the pH value of the solution obtained in the step (2) is adjusted; a magnesium salt is added into the solution to remove silicate ions and obtain a solution containing vanadium and tungsten; calcium chloride powder is added into the solution containing vanadium and tungsten to generate calcium tungstate; the calcium tungstate reacts with hydrochloric acid to generate tungstic acid; the tungstic acid is treated with ammonia dissolution and evaporative crystallization to obtain ammonium paratungstate crystals; (5) a precipitant ammonium chloride is added, and centrifugal drying is carried out to obtain solid ammonium vanadate. The method has the advantages that the operation is easy; three wastes are reduced; the economic efficiency is improved; the waste denitration catalyst is recycled.

Description

Technical field: [0001] The invention relates to a method for recycling waste denitrification catalysts, in particular to a method for separately recovering vanadium, tungsten and titanium metal oxides from catalysts containing vanadium, tungsten and titanium metal oxides. Background technique: [0002] The composition of flue gas denitrification catalyst is mainly TiO 2 、WO 3 , V 2 o 5 , while containing other Si, Al, Ca, Fe, Sr, Zr, K, Na ions and their metal oxides. The main active component of the denitrification catalyst is V 2 o 5 , providing denitrification reactive sites. V 2 o 5 It is a toxic substance, listed as V in the National Hazardous Waste List 2 o 5 The serial number is 412, the CAS number is 1314-62-1, and the UN number is 2862. At the same time, after a long period of use, the surface of the discarded denitrification catalyst will be enriched with heavy metals such as arsenic, mercury, cadmium, and chromium from soot. Simple methods such as land...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 林德海李冬芳宋宝华马帅朱彤王新宇于健福
Owner CECEP L&T ENVIRONMENTAL TECH
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