Method for recycling metal oxides from waste SCR (selective catalytic reduction) catalyst

A technology for SCR catalysts and waste catalysts, which is applied in the recovery of metal oxides from waste SCR catalysts and in the field of waste recycling, can solve the problems of comprehensive recovery of waste SCR flue gas denitrification catalysts, and achieve objective social and economic benefits

Inactive Publication Date: 2015-05-13
沈阳远大环境工程有限公司
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Problems solved by technology

[0012] At present, most of the retrieved waste catalyst recovery process patents are aimed at hydrodesulfurization catalysts in the petrochemical field. The use of catalysts in these two fields, the composition and properties of impurities are quite different, and these methods cannot be applied to waste SCR flue gas. Comprehensive recovery of denitrification catalysts

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  • Method for recycling metal oxides from waste SCR (selective catalytic reduction) catalyst
  • Method for recycling metal oxides from waste SCR (selective catalytic reduction) catalyst

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Embodiment Construction

[0031] This method that the present invention provides reclaims metal oxide from spent SCR catalyst and comprises the following steps:

[0032] Step 1) Crush:

[0033] Use compressed air to wash away the floating dust on the surface of the catalyst, then rinse with deionized water to clean and dissolve the dust and salt molecules combined with the surface of the catalyst, then dry it with air, and crush the spent catalyst to more than 80 mesh for later use.

[0034] Step 2) Remove impurities:

[0035] Use 3.5 times the water to soak the powder to remove the adsorbed arsenic, mercury, alkali metal salts and organic substances, and the filtered waste water is recycled after the activated carbon absorbs arsenic, mercury and organic substances;

[0036] Step 3) One stage leaching:

[0037] After removing impurities, add 3.5 times of 25% NaOH solution to the wet powder, heat to 80°C, and soak for 1 hour. The final pH value of the leach solution is controlled at 13-14, so that mos...

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Abstract

A method for recycling metal oxides from a waste SCR (selective catalytic reduction) catalyst is characterized in that: crushing, soaking and purifying by adsorption the waste SCR catalyst, adding NaOH solution according to the proportion, heating to 80 DEG C, then adding potassium chlorate to oxidize tetravalent vanadium in the raw material to pentavalent vanadium, regulating aqueous phase pH in the solution to 1.7-1.8 by NH4Cl, boiling for 1-2H, precipitating vanadium, refining to obtain pure ammonium metavanadate, adding HCl into filtrate in which vanadium is separated, regulating the pH to 4.5-5.0, adding CaCl2 solution, precipitating CaMoO4, filtering, and processing filter cake with HCl into H2MoO4 and H2WO4. The method solves the problems that a large number of land resources are occupied by landfill of the waste SCR catalyst, and soil and water resource are contaminated by toxic metals contained in the waste SCR catalyst, and the purpose of changing waste material into things of value and turning harmful things into beneficial things can be achieved.

Description

technical field [0001] The invention relates to a waste recovery method, in particular to a method for recovering metal oxides from waste SCR catalysts, and belongs to the technical field of non-ferrous metal recovery. technical background [0002] Selective catalytic reduction (SCR) flue gas denitrification technology has a significant effect on controlling boiler flue gas NOx, occupies a small area, is mature and easy to operate, and has no secondary pollution. Therefore, this technology is very popular and is currently the most widely used in industry. A denitrification technology that has been successfully applied to hundreds of power plant coal-fired boilers around the world and has decades of operating experience. The main chemical composition of the catalyst active material for SCR denitrification is TiO 2 , V 2 o 5 , WO 3 and MoO 3 ,TiO 2 It is an effective carrier for denitration catalysts, and the oxides of vanadium are in TiO 2 The surface has a good degree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/44C22B34/34C22B34/36C22B34/22
CPCY02P10/20
Inventor 李雄浩刘志军王玉龙李锋王志伟
Owner 沈阳远大环境工程有限公司
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