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Vanadium and tungsten recovered from scrap selective catalytic reduction catalyst

A catalyst and selective technology, applied in the field of recovery of vanadium and tungsten, can solve the problems of reduced recovery, cumbersome operation steps, pollution of the environment, etc., and achieve the effect of improving the recovery rate

Inactive Publication Date: 2015-04-29
CHINA STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the method of the Taiwan patent application can achieve a good tungsten recovery rate, the operation steps are cumbersome (extraction and then back extraction are required), and the cost of the extraction agent [trioctylamine (trioctylamine)] used is high, so complicated and high The recovery method of cost will reduce the willingness of relevant industry players to recycle vanadium and tungsten in waste SCR catalysts, and even cause the industry to discard waste SCR catalysts at will and pollute the environment
And the method also needs to additionally process the extraction waste liquid, the extraction agent used in the method itself will be slightly soluble in the water phase, and if the time of extraction and stripping is not properly controlled in the method, it will also cause the extraction agent Slightly soluble in the water phase, it will increase the difficulty of processing the extraction waste liquid, which will not only increase the cost of processing the extraction waste liquid, but also cause environmental pollution if the extraction waste liquid is not properly treated
[0005] It can be seen from the above that the selective catalytic reduction method can effectively treat nitrogen oxides, which is of great help to the prevention and control of air pollution. However, if the waste SCR catalyst produced is not properly disposed of, it will cause environmental pollution and waste of earth resources. Therefore, if we can develop a method for recovering vanadium and tungsten from waste SCR catalysts that can take into account high metal (vanadium and tungsten) recovery, low cost, and simple steps, and will not pollute the environment, it will be effective and comprehensive protection surroundings

Method used

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  • Vanadium and tungsten recovered from scrap selective catalytic reduction catalyst
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  • Vanadium and tungsten recovered from scrap selective catalytic reduction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] "Pre-processing steps"

[0070] [Roasting step]: Take the waste selective catalytic reduction catalyst (hereinafter referred to as waste SCR catalyst, manufacturer model: SINOx@Argillon Plate type SCR Catalyst), the waste SCR catalyst contains vanadium source (vanadium oxide V 2 o 5 ) and tungsten source (tungsten oxide WO 3 ), grinding the waste SCR catalyst to below 140 mesh to form the waste SCR catalyst powder, and mixing the sintering agent (sodium carbonate) with the waste SCR catalyst powder to form a mixture (the weight ratio of the waste SCR catalyst powder to sodium carbonate =10:7), then the mixture was roasted at 900°C for 3 hours to form a roasted spent SCR catalyst, the vanadium source and the tungsten source reacted with the roasting agent to form vanadium salt (Na 2 VO 3 ) and tungsten salt (Na 2 WO 4 ).

[0071] [Impregnation step]: impregnating the waste SCR catalyst through roasting treatment in deionized water to dissolve the vanadium salt (Na ...

Embodiment 2-1

[0081] [Example 2-1] Step of removing impurities

[0082] After adjusting the pH value of the impregnation solution of Example 1 to 8.5 with hydrochloric acid (concentration: 37%), let it stand for one day, and filter to remove the mixture of impurities [comprising: Al(OH) 3 , SiO nH 2 O and aluminosilicates] to form a purified impregnating solution (containing vanadium salt V 3 o 9 3- And tungsten salt WO 4 2- ). In this precipitation separation step, the removal rate of aluminum was 0.83%, the removal rate of silicon was 69.29%, the loss rate of vanadium was 9.72%, and the loss rate of tungsten was 32.90%.

Embodiment 2-2

[0083] [Example 2-2] Impurity removal step

[0084] After adjusting the pH value of the impregnation solution of Example 1 to 8 with sulfuric acid (concentration: 98%), filter to remove the mixture of impurities [comprising: Al(OH) 3 , SiO nH 2 O and aluminosilicates] to form a purified impregnating solution (containing vanadium salt V 3 o 9 3- And tungsten salt WO 4 2- ). In this precipitation separation step, the removal rate of aluminum was 47.65%, the removal rate of silicon was 21.23%, the loss rate of vanadium was 6.44%, and the loss rate of tungsten was 10.02%.

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Abstract

The present invention relates to a method for recovery of vanadium and tungsten catalysts from waste selective catalytic reduction. After the source of vanadium and tungsten including mixed waste source SCR catalyst calcination agent and firing process, the vanadium source and the source of tungsten and tungsten, vanadium salts are formed salt: A recovery from waste SCR catalyst vanadium and tungsten, comprising further impregnating liquid impregnated comprising the step of forming salts and vanadium salts of tungsten, then purified by impregnating solution, and adjusting the pH of the impregnating solution purified range of 1 to 3 to remove impurities formed by the step of removing the immersion liquid impurities liquid to be separated, and finally to an anion exchange resin to be separated liquid separation vanadium salts and tungsten salt, vanadium-containing solution, and tungsten-containing anion exchange resin. The method of the present invention can achieve very excellent recovery of vanadium and tungsten recoveries, without causing environmental pollution.

Description

technical field [0001] The invention relates to a method for recovering vanadium and tungsten from waste selective catalytic reduction catalysts, in particular to a method for cooperating with anion exchange resin to recover vanadium and tungsten in waste selective catalytic reduction catalysts. Background technique [0002] Selective catalytic reduction (Selective catalytic reduction, SCR) is currently the mainstream technology for treating air pollutant nitrogen oxides (NOx). The catalyst used in the selective catalytic reduction method (hereinafter referred to as SCR catalyst) includes a carrier (carrier) made of ceramics, and tungsten oxide (WO 3 ), vanadium oxide (V 2 o 5 ) and other active substances. The used SCR catalyst can no longer be used due to its reduced activity and becomes a waste SCR catalyst. The waste SCR catalyst itself contains heavy metals such as vanadium and tungsten. If it is discarded randomly, it will cause heavy metal pollution to the environm...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B3/12C22B3/42C22B34/22C22B34/36
CPCY02P10/20
Inventor 陈吉良杨其伟陈志恒许恺中钟明翰
Owner CHINA STEEL
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