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Method for recovering titanium, vanadium and tungsten in waste SCR denitration catalyst

The technology of denitration catalyst and recovery method is applied in the field of recovery of titanium vanadium tungsten in waste SCR denitration catalyst, which can solve the problems of large acid or alkali consumption, complicated process flow, poor treatment effect, etc., and achieves simple equipment and process flow. Simple, pollution-reducing effect

Active Publication Date: 2017-01-18
HUNAN GOLDEN EAGLE ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery process of the above-mentioned waste SCR denitrification catalyst has the following disadvantages: 1) the consumption of acid or alkali is large; 2) the technological process is too complicated; The processing effect is not good

Method used

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  • Method for recovering titanium, vanadium and tungsten in waste SCR denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Take 100g of spent SCR denitrification catalyst, including 1.50g of vanadium element, 5.50g of tungsten element, Fe 2 o 3 Powder 933.6g, coke powder 315.0g, after mixing evenly, add polyvinyl alcohol binder 229.7g, calcium oxide 121.7g;

[0050] (2) After fully mixing the mixture in step (1), use a manual hydraulic tablet press to press the balls. When pressing the balls, each pellet is kept under a pressure of 5MPa for about 20s before demoulding;

[0051] (3) Put the spherical material obtained in step (2) into a drying device, and take it out after drying at 100°C for 1 hour;

[0052] (4) Put the dried spherical material in the step (3) into the graphite crucible, put the crucible into the furnace after the high temperature resistance furnace rises to 1550°C, take it out and cool it to room temperature after keeping it warm for 1 hour;

[0053] (5) The slag and gold in the step (4) are directly separated, the vanadium-tungsten pig iron weighs 700.8g, and the ti...

Embodiment 2

[0059] (1) Take 10g of spent SCR denitrification catalyst, including 0.2g of vanadium element, 0.60g of tungsten element, Fe 3 o 4 Powder 45.0g, iron powder 60g, coke powder 16.88g, graphite powder 10.0g, CaO 18.0g, mix well and add PVA binder 26.72g;

[0060] (2) After fully mixing the raw materials with the binder added in step (1), use a manual hydraulic tablet press to press the balls. When pressing the balls, each pellet is held under a pressure of 15MPa for about 60s before demoulding;

[0061] (3) Put the spherical material obtained in the step (2) into a drying device, and take it out after drying at 130° C. for 5 hours;

[0062] (4) Put the dried spherical material in the step (3) into the graphite crucible, put the crucible into the furnace after the high-temperature resistance furnace rises to 1650°C, take it out and cool it to room temperature after keeping it warm for 3 hours;

[0063] (5) The slag and gold in the step (4) are directly separated, the vanadium-tu...

Embodiment 3

[0069] (1) Take 10g of spent SCR denitrification catalyst, including 0.50g of vanadium-containing element, 1.00g of tungsten-containing element, 35.0g of vanadium-titanium iron concentrate, Fe 2 o 3 Powder 95.0g, coal powder 30.0g, graphite powder 5.0g, CaO26.0g, mix well and add carboxymethylcellulose binder 39.2g;

[0070] (2) After fully mixing the raw materials with the binder added in step (1), use a manual hydraulic tablet press to press the balls. When pressing the balls, each pellet is held under a pressure of 10MPa for about 30s before demoulding;

[0071] (3) Put the spherical material obtained in the step (2) into a drying device, and take it out after drying at 125° C. for 4 hours;

[0072] (4) Put the dried spherical material in the step (3) into the graphite crucible, put the crucible into the furnace after the high-temperature resistance furnace rises to 1580°C, take it out and cool it to room temperature after keeping it warm for 2.5 hours;

[0073] (5) The s...

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Abstract

The invention provides a method for recovering titanium, vanadium and tungsten in a waste SCR denitration catalyst, and belongs to the technical field of catalyst recovery. Different from a process for recovering the waste SCR denitration catalyst through a dry-wet method, a pyrogenic process is adopted for recovering metallic oxides in the waste SCR denitration catalyst directly in an alloy mode. The method has the following advantages that (1) an iron element carbon thermal reduction method is adopted for direct recovery, complex operations are omitted, the technical process is simple, and only one step is required; (2) equipment is simple, and compared with the process for recovering the waste SCR denitration catalyst through the dry-wet method, cost and energy consumption are low; (3) pig iron containing vanadium and tungsten is directly obtained, and subsequent machining steps are reduced; and (4) pollution to the environment is reduced to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of recovery of waste catalysts, in particular to a method for recovery of titanium, vanadium and tungsten in waste SCR denitration catalysts. Background technique [0002] Spent SCR denitrification catalyst is solid waste in flue gas denitrification projects, and the most widely used is titanium oxide-based V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 series of catalysts, which contain a large amount of TiO 2 , V 2 o 5 、WO 3 Valuable metal oxides, they are all precious resources. The service life of domestic SCR denitrification catalysts is usually 3 years. According to the "2+1" arrangement of denitrification catalysts, it is estimated that from 2016, 38,000 t / a of waste SCR catalysts will be produced in China. Recycling is very necessary to improve its utilization value and avoid TiO 2 And the waste of rare metal vanadium and tungsten, and also has certain social and environmental benefits. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/24C22B1/02C22B34/12C22B34/36C22B34/22
CPCC22B1/02C22B1/24C22B7/001C22B7/009C22B34/1218C22B34/225C22B34/365Y02P10/20
Inventor 马兰杨绍利李强
Owner HUNAN GOLDEN EAGLE ENERGY TECH CO LTD