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Method for treating waste vanadium catalyst

A waste vanadium catalyst and admixture technology, applied in chemical instruments and methods, sustainable waste treatment, vanadium oxide, etc., can solve the problems of large acid consumption, failure, high production cost, etc., to reduce production costs, reduce Pollution, the effect of reducing acid usage

Inactive Publication Date: 2017-12-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The weak point of this invention is: 1. the extraction agent will fail after using a certain number of times, resulting in high production cost; Technically feasible, but economically infeasible; 3. The invention does not mention the treatment method for iron compounds and aluminum compounds in spent vanadium catalysts
The weak point of this application is: 1. directly adopt reducing acid leaching, cause the consumption of acid is too large; 2. utilize the silicon dioxide in the waste vanadium catalyst to prepare liquid sodium silicate to reclaim silicon technically feasible, but It is not economically feasible; 3. The application does not mention the treatment method for iron compounds and aluminum compounds in spent vanadium catalysts

Method used

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  • Method for treating waste vanadium catalyst

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Effect test

Embodiment 1

[0038] A method for processing spent vanadium catalyst, comprising the steps of:

[0039] 1. Grinding: Send the spent vanadium catalyst to a ball mill for grinding until the particle size is less than 125 microns; the particle size is 125 microns, which is 120 mesh;

[0040] 2. Water leaching: Mix the ground waste vanadium catalyst with water evenly, with a solid-to-liquid weight ratio of 1:4; leaching at 30°C for 2 hours; 30% of vanadium pentoxide and A mixture of vanadium tetroxide, 50% potassium sulfate. When 6≤pH≤8, the pentavalent vanadium ion in water is VO 3 (OH) 2- , V 3 o 9 3- , V 4 o 12 4- form, insoluble in water. Vanadium tetroxide is easily soluble in water. The water leaching product is separated by a filter press to obtain a water immersion liquid and a water leaching residue; the water immersion liquid directly enters a vanadium and potassium separation process; and the water leaching residue enters a reduction leaching process.

[0041] 3. Reduction...

Embodiment 2

[0052] A method for processing spent vanadium catalyst, comprising the steps of:

[0053] 1. Grinding: Send the spent vanadium catalyst to a ball mill for grinding until the particle size is less than 125 microns, which is 120 mesh.

[0054] 2. Water leaching: Mix the ground waste vanadium catalyst with water evenly, with a solid-to-liquid weight ratio of 1:3; leaching at 100°C for 3 hours; 50% of vanadium pentoxide and Mixture of vanadium tetroxide, 70% potassium sulfate. When 6≤pH≤8, the pentavalent vanadium ion in water is VO 3 (OH) 2- , V 3 o 9 3- , V 4 o 12 4- form, insoluble in water. Vanadium tetroxide is easily soluble in water. The water leaching product is separated by a filter press to obtain a water immersion liquid and a water leaching residue; the water immersion liquid directly enters a vanadium and potassium separation process; and the water leaching residue enters a reduction leaching process.

[0055] 3. Reduction leaching: Mix 2mol / L sulfuric acid...

Embodiment 3

[0066] A method for processing spent vanadium catalyst, comprising the steps of:

[0067] 1. Grinding: Send the spent vanadium catalyst to a ball mill for grinding until the particle size is less than 125 microns; a particle size of 125 microns is 120 mesh.

[0068] 2. Water leaching: Mix the ground waste vanadium catalyst with water evenly, with a solid-to-liquid weight ratio of 1:3; leaching at 80°C for 2 hours; leaching 30% of vanadium pentoxide and A mixture of vanadium tetroxide, 50% potassium sulfate. When 6≤pH≤8, the pentavalent vanadium ion in water is VO 3 (OH) 2- , V 3 o 9 3- , V 4 o 12 4- form, insoluble in water. Vanadium tetroxide is easily soluble in water. The water leaching product is separated by a filter press to obtain a water immersion liquid and a water leaching residue; the water immersion liquid directly enters a vanadium and potassium separation process; and the water leaching residue enters a reduction leaching process.

[0069]3. Reduction ...

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Abstract

The invention belongs to the field of waste catalyst treatment, and discloses a method for treating a waste vanadium catalyst. The method comprises the following procedures: performing grinding, performing water leaching, performing reduction leaching, performing vanadium-potassium separation, performing alkali fusion to remove impurities, regulating the pH value, performing vanadium deposition, and performing roasting to obtain leached residues, V2O5 solids and potassium sulfate, wherein the leached residues can be prepared into concrete. A method of performing water leaching before performing acid leaching is adopted, so that the consumption of acid in the vanadium leaching process is greatly reduced, and no expensive extracting agent is needed, thereby lowering the production cost; by using sulfur dioxide as a reducer, the sulfur dioxide waste gas discharged from a factory is effectively utilized, thereby reducing the environmental pollution; and the method disclosed by the invention realizes synchronous recovery of vanadium and potassium, and solves the problem about treating silicon dioxide, iron compounds and aluminum compounds in the waste vanadium catalyst, thereby being an ideal treatment method realizing no discharge of waste gas and waste residues.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of spent catalysts, and more specifically relates to a method for treating spent vanadium catalysts. Background technique [0002] There are 500,000 to 700,000 tons of solid waste catalysts produced every year in the world. If it is not treated, it will not only pollute the soil (vanadium pentoxide is a toxic substance, and its solubility in water is 8g / L), occupy a large amount of land (1 mu of land will be occupied for the storage of 10,000 tons of waste residue), but also cause rare and precious metal resources. waste. [0003] Vanadium-containing catalysts are used in the production of sulfuric acid. The active component of the catalyst is vanadium pentoxide, the promoter is potassium sulfate, and the catalyst carrier is diatomaceous earth. In addition, this catalyst also contains small amounts of iron and aluminum compounds. After the vanadium catalyst has been used for a period of time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C01D5/00C04B18/04C04B28/04
CPCC01D5/00C01G31/02C01P2006/80C04B18/0427C04B28/04C04B14/06C04B14/02C04B14/48C04B24/42C04B24/2652C04B14/324C04B14/305C04B14/104C04B14/022C04B24/38C04B24/045C04B14/42C04B14/386Y02W30/91
Inventor 陈允至尹振兴陈国栋刘富德谢天锋
Owner GUANGDONG UNIV OF TECH
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