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Method for recycling tungsten, vanadium and titanium from SCR waste catalysts

A technology for waste catalyst and denitration waste catalyst, which is applied in the fields of titanium, tungsten and vanadium recovery, can solve the problems of large waste water discharge and high reagent consumption, and achieve the effects of low cost, high product purity and high metal recovery rate.

Inactive Publication Date: 2016-10-12
无锡市华东电力设备有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can effectively extract tungsten and vanadium, they still have the disadvantages of large wastewater discharge and high reagent consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for recovering tungsten, vanadium and titanium from SCR spent catalyst comprises the steps in turn:

[0038] (1) Pretreatment: SCR waste catalyst containing WO32.76%, V2O51.23%, TiO274.3%, washed with high-pressure water to remove ash, dried, crushed, and ground until the particle size is less than 150 μm;

[0039] (2) Soda sintering: Take 10kg of the spent SCR catalyst, mix it with 4kg of Na2CO3 powder, stir it evenly, sinter at 750°C, and keep it for 3 hours to obtain the sintered material;

[0040] (3) Leaching: The sintered material from (2) is based on the volume of water: the mass ratio of spent catalyst is 1.5L / kg, adding water, leaching at 90°C for 2 hours, and obtaining sodium tungstate and vanadic acid after solid-liquid separation Sodium leach solution and titanium-rich leaching residue; wherein the leach solution containing sodium tungstate and sodium vanadate contains WO315.6g / L, V2O56.88g / L, and the pH value is 13.10; the weight of titanium-rich l...

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Abstract

The invention discloses a method for recycling tungsten, vanadium and titanium from SCR waste catalysts. The method comprises the following steps: after the SCR waste catalysts are cleaned, the SCR waste catalysts are smashed and screened, sodium carbonate is doped into the SCR waste catalysts to be evenly stirred, mixed powder is sintered at a high temperature to obtain a sintered material, water is added for leaching out, and a sodium salt mixed solution containing tungsten and vanadium is obtained; under the condition that the pH value of the solution is large than 12, tungsten is selectively extracted, and an ammonium salt solution is used for reverse extraction to obtain an ammonium tungstate solution; under the condition that the pH value of raffinate obtained after tungsten extraction ranges from 10 to 11.5, vanadium is extracted, and a sodium hydroxide solution is used for reverse extraction to obtain a sodium vanadate solution containing a small amount of tungsten; and titanium is left in leaching residues to obtain a rich-titanium material. According to the method, separation of tungsten and vanadium from impurities such as phosphorus, arsenic and silicon is achieved, and primary separation and efficient enrichment of tungsten, vanadium and titanium are achieved.

Description

technical field [0001] The invention relates to a method for recovering tungsten, vanadium and titanium from spent SCR denitrification catalysts, belonging to the field of non-ferrous metal recovery. Background technique [0002] Nitrogen oxides (NOx) are one of the sources of air pollution and pose a great threat to human health. Thermal power plants are one of the main sources of NOx emissions, and the current dry flue gas denitrification method is mainly selective catalytic reduction (SCR). SCR denitrification is to selectively reduce NOx to harmless N2 and H2O with ammonia or other reducing agents under the action of a specific catalyst: 4NO+4NH2+O2 → 4N2+6H2O; 4NH3+2NO2+O2 → 3N2+6H2O ; NO2+NO+2NH3 → 2N2+3H2O. The catalyst is the most critical component in the SCR system. SCR catalysts generally use TiO2 as a carrier, and rare metal oxides such as WO3 and V2O5 as active components. Among them, the content of WO3 is about 2 to 10%, the content of V2O5 is more than 0.5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B34/22C22B34/12C22B7/00C22B1/16
CPCC22B1/16C22B7/006C22B34/1236C22B34/225C22B34/365Y02P10/20
Inventor 丁建峰
Owner 无锡市华东电力设备有限公司
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