Method of recycling component substances in a waste SCR denitration catalyst

A denitration catalyst and catalyst technology are applied in the preparation of tungsten compounds, the preparation of molybdenum compounds, chemical instruments and methods, etc., which can solve the problems of high product impurities, low selectivity and high energy consumption, and achieve high purity, low cost, The effect of low energy consumption

Inactive Publication Date: 2017-12-01
北京清树科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the V in the SCR denitration catalyst 2 o 5 , WO 3 (MoO 3 ) accounts for less content, most of which are TiO 2 , also contains a part of SiO 2 and Al 2 o 3 , when the catalyst is recycled, it is easy to cause other component substances in the catalyst to be mixed into the target substance, resulting in more impurities in the product. During sodium roasting, sodium will not only combine with V 2 o 5 , WO 3 (MoO 3 ) reaction, also with the TiO 2 reaction, not only low selectivity, but also high energy consumption

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  • Method of recycling component substances in a waste SCR denitration catalyst

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Embodiment 1

[0033] In the spent SCR denitration catalyst of the present embodiment, mainly include: V 2 o 5 The mass fraction accounts for 1.10%, WO 3 The mass fraction of TiO is 4.85%. 2 The mass fraction accounts for 85.6%, SiO 2 The mass fraction of Al accounted for 4.51%, Al 2 o 3 The mass fraction accounts for 0.75%, a method for recovering the component substances in the spent SCR denitration catalyst, which specifically includes the following steps:

[0034] (1) Take the waste SCR denitrification catalyst, use a high-pressure air gun to purge the surface and pores of the catalyst to remove impurities such as dust attached to the surface, and then physically crush the catalyst to a particle size of 50-80 μm, and take out the powder after the crushing is completed;

[0035] (2) Take 300g of the catalyst powder in step (1), mix it with 450mL of sulfuric acid solution with a mass fraction of 0.4%, heat and stir at 75°C to form a suspension;

[0036] (3) Feed the vanadium pentoxid...

Embodiment 2

[0048] In the spent SCR denitration catalyst of the present embodiment, mainly include: V 2 o 5 The mass fraction of MoO is 0.86%. 3 The mass fraction of TiO is 6.50%. 2 The mass fraction accounts for 80.7%, SiO 2 The mass fraction of Al accounted for 4.79%, Al 2 o 3 The mass fraction accounts for 4.52%, a method for recovering the component substances in the spent SCR denitration catalyst, which specifically includes the following steps:

[0049] (1) Take the waste SCR denitration catalyst, use a high-pressure air gun to purge the surface and pores of the catalyst to remove impurities such as dust attached to the surface, and then physically pulverize the catalyst to a particle size of 60-90 μm, and take out the powder after pulverization;

[0050] (2) Take 200g of the catalyst powder in step (1), mix it with 380mL of sulfuric acid solution with a mass fraction of 0.3%, heat and stir at 85°C to form a suspension;

[0051] (3) Pass the vanadium pentoxide contained in the...

Embodiment 3

[0063] In the spent SCR denitration catalyst of the present embodiment, mainly include: V 2 o 5 The mass fraction of WO is 5.80%. 3 The mass fraction of TiO is 7.50%. 2 The mass fraction of SiO is 75.8%. 2 The mass fraction of Al accounted for 3.84%, Al 2 o 3 The mass fraction accounts for 2.36%, a method for recovering the component substances in the spent SCR denitration catalyst, which specifically includes the following steps:

[0064](1) Take the waste SCR denitrification catalyst, use a high-pressure air gun to purge the surface and pores of the catalyst to remove impurities such as dust attached to the surface, and then physically pulverize the catalyst to a particle size of 50-70 μm, and take out the powder after the pulverization;

[0065] (2) Take 500g of the catalyst powder in step (1), mix it with 650mL of sulfuric acid solution with a mass fraction of 3%, and heat and stir at 95°C to form a suspension;

[0066] (3) Pass the vanadium pentoxide contained in th...

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Abstract

The invention discloses a method of recycling component substances in a waste SCR denitration catalyst. The method includes the following steps: 1) performing pretreatment to remove impurities on the surface of the waste SCR denitration catalyst and crushing the catalyst; 2) adding the crushed catalyst to a sulfuric acid solution to reduce vanadium (V) with SO2 gas, filtering and separating the solution, and regulating the pH value of the filtrate to precipitate vanadium hydroxide; 3) adding an alkali solution to filter residues to dissolve tungsten (molybdenum) trioxide, silicon dioxide and aluminum oxide, and filtering and separating the solution to obtain TiO2 and an alkaline filtrate; 4) regulating the pH value of the alkaline filtrate to precipitate silicon and aluminum, filtering and separating the filtrate, and adsorbing tungsten (molybdenum) ions from the filtrate by ion exchange resin; 5) eluting the tungsten (molybdenum) ions from the resin to obtain tungstate (molybdate). The method achieves high-effective separation of the component substances in a SCR denitration catalyst, reaches more than 96% in recycling rate and more than 98% in purity. The method is low in energy consumption and cost and has wide industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of recovery of denitration catalysts, in particular to a method for recovering component substances in waste SCR denitration catalysts. Background technique [0002] On September 21, 2011, the country issued a new national standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", which stipulates that the emission concentration limit of nitrogen oxides from thermal power boilers and gas turbines should be reduced to 100mg / m 3 . In this context, selective catalytic reduction (SCR) technology, the mainstream technology for flue gas denitrification in thermal power plants, and its key equipment denitrification catalyst industry have been greatly developed. According to statistics from the China Electricity Council, as of the end of 2014, the capacity of flue gas denitration units in thermal power plants was about 687 million kilowatts, accounting for 75.0% of the national thermal po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01G39/00C01G31/00C01G23/053C01F7/06C01F7/14
CPCC01G41/00C01F7/0693C01F7/141C01G23/053C01G31/00C01G39/00C01G39/003C01G41/003C01P2006/80
Inventor 王仁虎
Owner 北京清树科技发展有限公司
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