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Method for realizing efficient co-extraction of tungsten and vanadium from waste SCR (Selective Catalytic Reduction) denitrification catalyst

A denitration catalyst and high-efficiency technology, applied in chemical instruments and methods, inorganic chemistry, vanadium compounds, etc., can solve the problems of low recovery rate of vanadium and tungsten, poor reactivity, high energy consumption, etc., achieve low vanadium and tungsten content, and slag discharge The effect of reducing the amount of water and reducing the amount of water loss

Inactive Publication Date: 2017-12-12
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above methods all follow the method of extracting vanadium from vanadium ore, that is, adding sodium salt to roast at high temperature, resulting in high energy consumption, and poor contact between solid catalyst and solid sodium carbonate, resulting in poor reactivity between the two, and low recovery rate of vanadium and tungsten

Method used

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  • Method for realizing efficient co-extraction of tungsten and vanadium from waste SCR (Selective Catalytic Reduction) denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Pretreatment: crush and ball-mill the waste SCR denitration catalyst to 250 mesh;

[0042] (2) Ingredients: mix 70g of waste SCR denitration catalyst with 50% NaOH solution, the mass ratio of NaOH to waste SCR denitration catalyst is 10:1;

[0043] (3) Stripping reaction: the slurry in step (2) is carried out in a 1L high-pressure stirred reactor, and oxygen and oxygen are introduced to carry out a gas-liquid-solid three-phase stripping reaction, and the partial pressure of oxygen is 5Mpa. The reaction temperature is 200°C. The time is 5h, and the stirring speed is 180 rpm;

[0044] (4) Dilution and heat preservation: dilute and heat-preserve the dissolution slurry obtained in step (3), until the alkali concentration is 400g / L, and the heat-preservation range is 120°C;

[0045] (5) Solid-liquid separation: the diluted slurry obtained in step (4) is subjected to solid-liquid separation to obtain tailings and NaOH, Na 3 VO 4 、Na 2 WO 4 and the eluate of water-sol...

Embodiment 2

[0050] (1) Pretreatment: crush and ball-mill the waste SCR denitration catalyst to 20 mesh;

[0051] (2) Ingredients: Mix 150 g of waste SCR denitration catalyst with NaOH solution with a mass concentration of 20%, and the mass ratio of NaOH to waste SCR denitration catalyst is 3:1;

[0052] (3) Stripping reaction: the slurry in step (2) is carried out in a 1L high-pressure stirred reactor, and oxygen is introduced to carry out a gas-liquid-solid three-phase stripping reaction, and the oxygen partial pressure is 3Mpa. The reaction temperature is 150°C, and the reaction time For 3h, the stirring speed is 120 rpm;

[0053] (4) Dilution and insulation: Dilute and insulate the stripping slurry obtained in step (3) until the alkali concentration is 150g / L, and the insulation range is 80°C;

[0054] (5) Solid-liquid separation: the diluted slurry obtained in step (4) is subjected to solid-liquid separation to obtain tailings and NaOH, Na 3 VO 4 、Na 2 WO 4 and the eluate of wate...

Embodiment 3

[0059] (1) Pretreatment: 100g of waste SCR denitrification catalyst is crushed and ball milled to 80 mesh;

[0060] (2) Ingredients: mix the waste SCR denitrification catalyst with a NaOH solution with a mass concentration of 28%, and the mass ratio of NaOH to the waste SCR denitration catalyst is 5:1;

[0061] (3) Stripping reaction: the slurry described in step (2) is carried out in a 1L high-pressure stirred reactor, and oxygen is introduced to carry out gas-liquid-solid three-phase stripping reaction, the oxygen partial pressure is 4Mpa, the reaction temperature is 120°C, and the reaction time For 3h, the stirring speed is 100 rev / min;

[0062] (4) Dilution and heat preservation: the stripping slurry obtained in step (3) is diluted and heat-preserved until the alkali concentration is 235g / L, and the heat-preservation range is 100°C;

[0063] (5) Solid-liquid separation: the diluted slurry obtained in step (4) is subjected to solid-liquid separation to obtain tailings and ...

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Abstract

A method for realizing high-efficiency co-extraction of vanadium and tungsten from waste SCR denitration catalysts. The waste SCR denitration catalysts are reacted with sodium hydroxide solution under an oxidizing gas of 0.2-5Mpa and then separated from solids and liquids. The content of vanadium and tungsten in the tailing slag obtained by the method of the invention is low, and the one-time extraction rate of vanadium and tungsten is higher than 95%, which realizes efficient co-extraction of vanadium and tungsten in the denitrification catalyst.

Description

technical field [0001] The invention belongs to the fields of hydrometallurgy and vanadium chemical industry, and particularly relates to a method for realizing high-efficiency co-extraction of tungsten and vanadium from waste SCR denitration catalysts. Background technique [0002] SCR denitration catalyst generally refers to the catalyst used in the SCR (selective catalytic reduction) denitration system of the power plant. In the SCR reaction, the reducing agent is selectively reacted with the nitrogen oxides in the flue gas at a certain temperature. [0003] At present, there are a large number of SCR denitration catalysts that cannot be regenerated or are damaged during the regeneration process and need to be discarded. It is estimated that after 2018, 78,000 tons of SCR catalysts will be discarded in my country every year, which will become new solid wastes and cause potential harm to the environment. A small amount of SCR catalyst deactivation is reversible poisoning ...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01G41/00
CPCC01G31/00C01G41/00
Inventor 王海旭陈东辉高明磊李兰杰高玲玲
Owner HEBEI IRON AND STEEL
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