Method for recovering vanadium, tungstate/molybdenum and titanium elements from waste SCR denitrification catalyst

A denitrification catalyst and catalyst technology, applied in the direction of improving process efficiency, etc., can solve the problems of lack of high-efficiency recovery technology, hazards, no recovery, etc., and achieve the effects of optimizing experimental conditions, improving reaction efficiency, and reducing losses

Active Publication Date: 2019-05-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste SCR denitrification catalyst not only contains B-level inorganic highly toxic substances V 2 o 5 and heavy metal oxides WO 3 or MoO 3 During use, it will also absorb highly toxic elements such as As, Hg, and Pb in the flue gas, and these toxic elements will bring great harm to the environment if they enter the environment
[0004] (2) Large output
[0005] (3) Many high value-added components
[0006] (4) Recycling is difficult, and efficient recycling technology is lacking
SCR denitration catalyst contains V 2 o 5 、WO 3 /MoO 3 and TiO 2 In addition, the use of forming aids in the production process will introduce SiO 2 、Al 2 o 3 And CaO and other components, and i...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 describes a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0048] (1) Pretreatment of waste SCR denitration catalyst

[0049] Take a waste flat SCR denitrification catalyst from a power plant (V 2 o 5 -WO 3 / TiO 2 ), blow off the surface dust, and separate the catalyst from the metal mesh by shaking and knocking; collect the fallen catalyst, and then roast it at 450 ° C for 12 hours; after roasting, the catalyst is fully pulverized to below 200 mesh to obtain waste catalyst powder.

[0050] (2) Separation of titanium elements from vanadium and tungsten elements

[0051] The spent catalyst powder was mixed with Na 2 CO 3 Mix evenly, wherein the molar ratio Na:Ti=1.5:1, then add an appropriate amount of water and continue stirring; after fully drying, roast at 650°C for 10h to obtain agglomerates; crush the agglomerates to below 200 mesh, heat and stir at 60°C Repea...

Embodiment 2

[0064] Embodiment 2 describes a method for recovering vanadium, molybdenum and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0065] (1) Pretreatment of waste SCR denitration catalyst

[0066] Take a waste flat SCR denitrification catalyst from a power plant (V 2 o 5 -MoO 3 / TiO 2 ), blow off the surface area dust, and separate the catalyst from the metal mesh by shaking and knocking; collect the fallen catalyst, and then roast it at 650 ° C for 2 hours; after roasting, the catalyst is fully pulverized to below 200 mesh to obtain waste catalyst powder.

[0067](2) Separation of titanium elements from vanadium and molybdenum elements

[0068] Mix the waste catalyst powder and NaOH solid evenly, in which the molar ratio Na:Ti=3:1, and then add an appropriate amount of water to continue stirring; after fully drying, roast at 800°C for 3 hours to obtain a sintered block; crush the sintered block to below 200 mesh, Under the condition...

Embodiment 3

[0081] Embodiment 3 describes another method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0082] (1) Pretreatment of waste SCR denitration catalyst

[0083] Take a waste honeycomb SCR denitrification catalyst from a power plant (V 2 o 5 -WO 3 / TiO 2 ), after the soot blowing treatment, the catalyst was calcined at 600° C. for 8 h; the soot was blown again, and then the catalyst was fully pulverized to below 200 mesh to obtain waste catalyst powder.

[0084] (2) Separation of titanium elements from vanadium and tungsten elements

[0085] The spent catalyst powder was mixed with Na 2 CO 3 Mix evenly, wherein the molar ratio Na:Ti=2.5:1, then add an appropriate amount of water to continue stirring; after fully drying, roast at 800°C for 6h to obtain a sintered block; crush the sintered block to below 200 mesh, heat and stir at 90°C Repeat the leaching with NaOH solution with a concentration ...

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PUM

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Abstract

The invention belongs to the field of nonferrous metal recovery, and relates to a method for recovering vanadium, tungsten/molybdenum and titanium elements from a waste SCR denitrification catalyst. The method for recovering the vanadium tungsten/molybdenum and titanium elements comprises the steps of waste catalyst pretreatment, element separation, element purification and element recovery, through a specific recovery process, high-efficiency recovery of vanadium, tungstate/molybdenum and titanium elements in the waste SCR denitrification catalyst is realized (chemical properties of tungstenand molybdenum are very similar, and the process has the same effect on tungsten and molybdenum). The recovery process has the advantages of high recovery rate, excellent product purity, easy operation and low input cost, and has high market value in the field of waste catalyst element recovery in the flue gas denitrification industry.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, in particular to a method for recovering vanadium, tungsten / molybdenum and titanium elements from waste SCR denitration catalysts. Background technique [0002] With the continuous improvement of environmental protection awareness, in addition to coal-fired power plants, the emission standards for flue gas pollutants in industries such as steel, cement, and waste incineration have successively introduced restrictions on the concentration of NOx emissions. At present, as the mainstream flue gas denitrification technology in China, SCR denitrification technology is widely used in the NOx emission control of flue gas in different industries. The SCR denitrification catalyst is the key to the SCR denitrification technology. The harsh working environment usually results in a service life of only 2-3 years. The catalyst whose activity decreases and cannot be recovered by regeneration technolog...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/00C22B34/12C22B34/22C22B34/34C22B34/36
CPCY02P10/20
Inventor 陆强吴洋文徐明新刘吉杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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