A method for recovering anatase-type titanium-tungsten powder from waste vanadium-tungsten-titanium catalyst

An anatase-type catalyst technology, which is applied in the direction of improving process efficiency, can solve the problems that vanadium-tungsten-titanium catalyst cannot be used again, and the specific surface area is low, so as to shorten the holding time, reduce the roasting temperature, and have strong operability. Effect

Active Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires high temperature (leaching temperature of 130-220°C, leaching time of 1-6 hours) high-pressure treatment (leaching pressure of 0.3-1.2MPa), and the product prepared at the same time is rutile with a very low specific surface area. Type titanium dioxide, can not be used again in the production of vanadium tungsten titanium catalyst

Method used

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  • A method for recovering anatase-type titanium-tungsten powder from waste vanadium-tungsten-titanium catalyst

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Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Put the waste vanadium-tungsten-titanium catalyst into an ultrasonic oscillator, add a foaming agent at the same time for ultrasonic oscillation, use ultrasonic waves to remove dust and other substances adsorbed on the surface of the catalyst, and dry after cleaning; (2) After drying, The waste vanadium-tungsten-titanium catalyst is ground, and Na 2 CO 3 and NaClO 3 , mixed evenly and ground to 100-150 mesh, of which Na 2 CO 3 The mass ratio to the spent vanadium-tungsten-titanium catalyst is 1.5:1, NaClO 3 The mass ratio of the spent vanadium-tungsten-titanium catalyst is 1:100. (3) Put the mixed powder into a microwave roasting furnace, heat it to 700 °C with a heating rate of 100 °C / min, keep it warm for 30 minutes, and then cool it to room temperature with the furnace; (4) Microwave roasting and digestion to obtain The powder is ground and added to warm water at about 90°C, the mass ratio of powder to ...

Embodiment 2

[0027] This embodiment includes the following steps:

[0028] (1) Put the waste vanadium-tungsten-titanium catalyst into an ultrasonic oscillator, add a foaming agent at the same time for ultrasonic oscillation, use ultrasonic waves to remove dust and other substances adsorbed on the surface of the catalyst, and dry after cleaning; (2) After drying, The waste vanadium-tungsten-titanium catalyst is ground, and Na 2 CO 3and NaClO 3 , mix well and grind to 100-150 mesh. where Na 2 CO 3 The mass ratio with spent vanadium tungsten titanium catalyst is 1.3:1, NaClO 3 The mass ratio of spent vanadium-tungsten-titanium catalyst is 1:100. (3) Put the mixed powder into a microwave roasting furnace, heat it up to 600°C with a microwave at a heating rate of 100°C / min, keep it warm for 30 minutes, and then cool it down to room temperature with the furnace. (4) Grind the powder obtained by microwave roasting and digestion, add it into warm water at about 90°C, the mass ratio of powde...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] (1) Put the waste vanadium-tungsten-titanium catalyst into an ultrasonic oscillator, add a foaming agent at the same time for ultrasonic oscillation, use ultrasonic waves to remove dust and other substances adsorbed on the surface of the catalyst, and dry after cleaning; (2) After drying, The waste vanadium-tungsten-titanium catalyst is ground, and Na 2 CO 3 and NaClO 3 , mix well and grind to 100-150 mesh. where Na 2 CO 3 The mass ratio to the spent vanadium-tungsten-titanium catalyst is 1.5:1, NaClO 3 The mass ratio of the spent vanadium-tungsten-titanium catalyst is 5:100. (3) Put the mixed powder into a microwave roasting furnace, heat it up to 500°C with a microwave at a heating rate of 100°C / min, keep it warm for 30 minutes, and then cool it down to room temperature with the furnace. (4) Grind the powder obtained by microwave roasting and digestion, add it into warm water at about 90°C, the mass ratio o...

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Abstract

The invention discloses a method for recovering anatase-type titanium tungsten powder from a waste vanadium-tungsten-titanium catalyst. The method comprises the following steps: performing ultrasonic cleaning on the waste vanadium-tungsten-titanium catalyst; mixing and grinding the catalyst, Na2CO3 and NaClO3; adding sodium chlorate into sodium carbonate to serve as a compound digesting agent by adopting a microwave roasting digesting method, wherein the reaction temperature of the sodium carbonate and the catalyst in a traditional high-temperature furnace roasting digesting process can be reduced from original 700 DEG C to 450 DEG C, and the reaction time is shortened from 3 hours to 30 minutes; finally, soaking by using warm water, acidizing, performing solid-liquid separation, performing acid washing and water washing, and roasting in a high-temperature furnace, wherein the obtained titanium dioxide powder contains a certain amount of tungsten oxide, and obtaining anatase-type titanium tungsten powder with high purity and high specific area. The method has the characteristics of energy conservation, environment friendliness, easiness in operation and high recovering efficiency; meanwhile, the recovered tungsten powder can serve as a raw material and can be directly used in the production of the vanadium-tungsten-titanium catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst recovery and reuse, and in particular relates to a method for recovering anatase-type titanium-tungsten powder from waste vanadium-tungsten-titanium catalysts using a microwave roasting and digestion method. Background technique [0002] Nitrogen oxides are the key pollutant emission reduction objects of my country's "Twelfth Five-Year Plan". From January 1, 2014, the nitrogen oxide emissions of thermal power units put into operation in all key and non-key areas are required to be reduced to 100mg / m3 respectively. 3 and 200mg / m 3 . In addition, various industrial sources such as steel, cement, glass, and petrochemicals, as well as civil sources such as waste incineration and district heating boilers, are expected to gradually increase the limit requirements for nitrogen oxide emissions. The demand for vanadium-tungsten-titanium denitrification catalysts has greatly increased, and its consumptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00B22F9/20
CPCY02P10/20
Inventor 吴晓东许腾飞刘雪松翁端
Owner TSINGHUA UNIV
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