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Method for recovering nano iron tungstate from waste catalyst

A waste catalyst and nano-tungsten technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., to achieve efficient recycling

Active Publication Date: 2021-06-29
绍兴上虞华电光大环境有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the relevant technologies related to the recovery of resources from spent denitrification catalysts are not yet mature, that is, there is still room for improvement in the recovery rate and purification of existing methods in terms of cleaning, energy saving and recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A From V 2 o 5 -WO 3 / TiO 2 A method for recovering nano-iron tungstate from type waste catalysts, the specific steps include:

[0021] (1) Put the spent catalyst in the concentration of 180g / L Na 2 CO 3 Soak in the solution for 24 hours;

[0022] (2) Roast the waste catalyst after soaking in step (1) at 550°C for 12h, cool to 350°C and carry out wet grinding in a ball mill. The particle size of the spent catalyst is below 300 mesh;

[0023] (3) performing solid-liquid separation on the wet-milled material in step (2) through a filter press to obtain a tungsten-containing solution;

[0024] (4) Extracting the tungsten-containing solution with the nitrogen of tetrabutylammonium bisulfate as an extractant, the pH value of the extractant is 9, and an extract is obtained;

[0025] (5) prepare precipitant, comprise 1mol / L ferric chloride and 0.25mol / L ethylenediaminetetraacetic acid in the precipitant; According to molar ratio ferric chloride / tungsten elem...

Embodiment 2

[0028] Example 2: A From V 2 o 5 -WO 3 / TiO 2 A method for recovering nano-iron tungstate from type waste catalysts, the specific steps include:

[0029] (1) Put the spent catalyst in the concentration of 240g / L Na 2 CO 3 Soak in the solution for 12 hours;

[0030] (2) Roast the waste catalyst after soaking in step (1) at 850°C for 6h, cool to 500°C and perform wet grinding in a ball mill. The particle size of the spent catalyst is below 300 mesh;

[0031] (3) performing solid-liquid separation on the wet-milled material in step (2) through a filter press to obtain a tungsten-containing solution;

[0032] (4) extracting the tungsten-containing solution with the nitrogen of tetrabutylammonium bisulfate as an extractant, the pH value of the extractant is 12, and an extract is obtained;

[0033] (5) Precipitating agent is prepared, including 2mol / L iron chloride and 1mol / L ethylenediaminetetraacetic acid in the precipitating agent; adding the precipitating agent to the ex...

Embodiment 3

[0036] Example 3: A From V 2 o 5 -WO 3 / TiO 2 A method for recovering nano-iron tungstate from type waste catalysts, the specific steps include:

[0037] (1) Put the spent catalyst in the concentration of 200g / L Na 2 CO 3 Soak in the solution for 18 hours;

[0038] (2) Roast the waste catalyst after soaking in step (1) at 700°C for 8h, cool to 450°C and perform wet grinding in a ball mill. The particle size of the spent catalyst is below 300 mesh;

[0039] (3) performing solid-liquid separation on the wet-milled material in step (2) through a filter press to obtain a tungsten-containing solution;

[0040] (4) Extracting the tungsten-containing solution with the nitrogen of tetrabutylammonium bisulfate as an extractant, the pH value of the extractant is 10, and an extract is obtained;

[0041] (5) prepare precipitant, comprise 1.5mol / L iron chloride and 0.5mol / L ethylenediaminetetraacetic acid in the precipitant; According to molar ratio iron chloride / tungsten element i...

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Abstract

The invention relates to a method for recovering nano iron tungstate from a waste catalyst. The method comprises the following steps of (1) soaking the waste catalyst in a Na2CO3 solution; (2) roasting the soaked waste catalyst, carrying out cooling, and performing wet grinding to below 300 meshes; (3) carrying out solid-liquid separation on the material subjected to wet grinding treatment through a filter press to obtain a tungsten-containing solution; (4) extracting the tungsten-containing solution; (5) preparing a precipitant, adding the precipitant into the extracting solution obtained in step (4) according to the molar ratio of ferric chloride to tungsten being 1, carrying out heating and dissolving, and then carrying out cooling and standing; and (6) evaporating and concentrating the solution obtained in step (5) to obtain iron tungstate crystals. According to the method, high-quality nano iron tungstate can be recovered, the recovery rate of waste SCR catalyst is increased, and dust pollution caused during recovery in the prior art can be avoided.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recovery, in particular a method for recovering nanometer iron tungstate from waste catalysts. Background technique [0002] The SCR denitrification catalyst is mainly used for the removal of nitrogen oxides in the flue gas of coal-fired boilers. The nitrogen oxides react with ammonia on the catalyst and under certain temperature conditions to form nitrogen and water. The substance that acts as a catalyst in the SCR denitration catalyst is vanadium pentoxide. In order to ensure the thermal stability of the catalyst in the coal-fired flue gas, a certain amount of ammonium metatungstate will be added during the catalyst preparation process. The high-temperature calcination in the preparation process decomposes into tungsten trioxide. With long-term operation, the volatile metals and dust in the coal-fired flue gas clog the denitrification catalyst, resulting in physical or chemical deacti...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/36B82Y40/00C01G49/00
CPCC22B7/009C22B7/006C22B34/365C01G49/00B82Y40/00Y02P10/20
Inventor 陈晨曲艳超任翠涛
Owner 绍兴上虞华电光大环境有限公司
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