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A recovery method of spent SCR denitrification catalyst and nanopowder containing vanadium-tungsten-titanium

The technology of a denitration catalyst and a recovery method is applied in the recovery field of vanadium-tungsten-titanium-containing nano-powder and waste SCR denitration catalyst, which can solve the problems of complicated operation and poor recovery effect.

Active Publication Date: 2020-12-15
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of complex operation and poor recovery effect in the existing waste SCR denitrification catalyst recovery method, and provide a waste catalyst with simpler operation, high recovery rate of vanadium, tungsten and titanium, and easy-to-use products. Recovery method of SCR denitration catalyst and nanopowder containing vanadium-tungsten-titanium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This example is used to illustrate the recovery method of the waste SCR denitration catalyst and the nanopowder containing vanadium-tungsten-titanium of the present invention.

[0046] (1) Grinding 100g of spent SCR denitration catalyst into 200-400 mesh powder, then adding concentrated sulfuric acid (180g) with a concentration of 95% by weight, heating and reacting at 220°C for 3h, and filtering to obtain filtrate containing vanadium and titanium and containing Tungsten filter residue.

[0047] (2) Adjust the pH value of the filtrate containing vanadium and titanium obtained in step (1) to 1, hydrolyze at 130° C. for 2 hours, filter and wash the filter cake with water, thereby obtaining a filter cake containing vanadium and titanium.

[0048] (3) combine the tungsten-containing filter residue of step (1) gained with 25% by weight of ammonia (with respect to 1mol of 3 The spent SCR denitrification catalyst, the amount of ammonia used is 2mol), mixed and reacted at 90°C...

Embodiment 2

[0052] This example is used to illustrate the recovery method of the waste SCR denitration catalyst and the nanopowder containing vanadium-tungsten-titanium of the present invention.

[0053] (1) Grinding 100g of spent SCR denitrification catalyst into 100-200 mesh powder, then adding concentrated sulfuric acid (250g) with a concentration of 90% by weight, heating and reacting at 180°C for 5h, and filtering to obtain filtrate containing vanadium and titanium and containing Tungsten filter residue.

[0054] (2) Adjust the pH value of the filtrate containing vanadium and titanium obtained in step (1) to 1.0, hydrolyze at 140° C. for 2.5 hours, filter and wash the filter cake with water to obtain a filter cake containing vanadium and titanium.

[0055] (3) combine the tungsten-containing filter residue of step (1) gained with 20% by weight of ammonia (with respect to 1mol of 3 The spent SCR denitrification catalyst, the amount of ammonia water is 4mol) mixed and reacted at 100°C...

Embodiment 3

[0059] This example is used to illustrate the recovery method of the waste SCR denitration catalyst and the nanopowder containing vanadium-tungsten-titanium of the present invention.

[0060] According to the method described in Example 1, the difference is that in step (1), the temperature of the heating reaction is 160 ° C, and other steps are the same as in Example 1;

[0061] After step (4), the recovery rate of vanadium is 75.8%, the recovery rate of tungsten is 67.3%, and the recovery rate of titanium is 53.2%;

[0062] After step (5), the vanadium-tungsten-titanium-containing nanopowder N3 is obtained, and its average particle size is 37nm.

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Abstract

The invention relates to the field of catalyst recovery, in particular to a waste SCR denitration catalyst recovery method and nanometer powder containing vanadium-tungsten-titanium. The recovery method comprises the steps of carrying out heating reaction on a waste SCR denitration catalyst and acid, carrying out solid-liquid separation on a product obtained through heating reaction, and obtaininga first liquid phase containing titanium and vanadium, and a first solid phase containing tungsten; carrying out hydrolysis reaction on the first liquid phase, carrying out solid-liquid separation onthe obtained product, and obtaining a second solid phase containing vanadium and titanium; carrying out contact reaction on the first solid phase and a solution of an alkali compound so as to obtaina tungsten-containing solution; pulping the second solid phase, adjusting a pH value, mixing with the tungsten-containing solution, and carrying out heating treatment; carrying out solid-liquid separation on a product obtained through heating treatment so as to obtain a third solid phase, and roasting. The method provided by the invention can be used for high-efficiently recovering the vanadium, the tungsten and the titanium in the waste SCR denitration catalyst, and an SCR denitration catalyst with a high denitration effect can be prepared through the obtained nanometer powder containing vanadium-tungsten-titanium.

Description

technical field [0001] The invention relates to the field of catalyst recovery, in particular to a recovery method of a waste SCR denitration catalyst and nanopowder containing vanadium-tungsten-titanium. Background technique [0002] Nearly 70% of my country's nitrogen oxide emissions come from direct coal combustion, and thermal power coal combustion accounts for more than 50% of direct coal combustion. It is predicted that during the "Twelfth Five-Year Plan" period, my country's thermal power installed capacity will still maintain a relatively high growth rate, and by the end of 2015, the national thermal power installed capacity will exceed 9.3 billion kilowatts. In the next ten years, firepower development will still be the main force of my country's power supply. Under such circumstances, the state requires further deepening the reduction of the total amount of major pollutants, and has added a new binding target for nitrogen oxides, requiring a 10% emission reduction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/36
CPCC22B7/007C22B7/008C22B34/125C22B34/225C22B34/365Y02P10/20
Inventor 何发泉刘子林王宝冬马少丹林德海马子然马静孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD