Method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalyst

A technology for denitration catalysts and waste catalysts, applied in chemical instruments and methods, vanadium oxide, inorganic chemistry, etc., can solve the problems of not forming a complete and mature recycling technology and related scale, difficult to realize industrialization of technology, and poor product quality, etc. Effects of diffusivity and solubility, low recovery process cost, reduced maintenance and replacement costs

Active Publication Date: 2020-04-17
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the recycling processes that have been proposed so far have shortcomings such as low recovery rate, poor product quality, high cost, and difficulty in realizing industrialization of the technology, and a complete and mature recycling technology and related scale have not yet been formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 describes a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0032] (1) Raw material pretreatment

[0033] Using the flat-plate SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash attached to the surface, and then vibrate the plate-type catalyst to separate the catalyst from the metal mesh plate; collect the detached catalyst and roast it at 600°C for 6 hours; The catalyst was pulverized and sieved to obtain waste catalyst powder below 150 mesh.

[0034] (2) Separation and recovery of vanadium

[0035] Get 5kg waste catalyst powder and add in 30kg acetic acid solution, the volume concentration of acetic acid solution is 10%; Add 0.3kg fatty acid polyoxyethylene ester additionally to the solution, then feed N under the condition of heating and stirring at 80°C 2 and SO 2 mixed gas, SO 2 The volume concentration is 5%, the mixed gas...

Embodiment 2

[0042] Embodiment 2 describes a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0043] (1) Raw material pretreatment

[0044] Using the honeycomb SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash on the surface, and then roast the catalyst at 650°C for 5 hours; crush and sieve the roasted catalyst to obtain waste catalyst powder below 150 mesh .

[0045] (2) Separation and recovery of vanadium

[0046] Get 3kg waste catalyst powder and add in 18kg acetic acid solution, the volume concentration of acetic acid solution is 15%; Add 0.09kg fatty acid polyoxyethylene ester additionally in the solution, then feed N under the condition of heating and stirring at 85°C 2 and SO 2 mixed gas, SO 2 The volume concentration is 4%, the mixed gas flow rate is 5L / min, fully reacted for 2.5h, and filtered to obtain dark blue VOSO 4 Solution and solid residue, the...

Embodiment 3

[0053] Embodiment 3 describes another method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts, and the specific steps include:

[0054] (1) Raw material pretreatment

[0055] Using the flat-plate SCR denitrification catalyst eliminated by a power plant as raw material, blow off the ash attached to the surface, and then vibrate the plate-type catalyst to separate the catalyst from the metal mesh plate; collect the detached catalyst and roast it at 700°C for 4 hours; The catalyst was pulverized and sieved to obtain waste catalyst powder below 150 mesh.

[0056] (2) Separation and recovery of vanadium

[0057] Take 10kg of waste catalyst powder and add it to 60kg of formic acid solution, the volume concentration of formic acid solution is 20%; add 0.9kg of fatty acid polyoxyethylene ester to the solution, and then pass N under the condition of heating and stirring at 90°C. 2 and SO 2 mixed gas, SO 2 The volume concentration is 3%, t...

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PUM

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Abstract

The invention belongs to the field of nonferrous metal recovery, and particularly relates to a method for recovering vanadium, tungsten and titanium elements from a waste SCR denitration catalyst. Themethod for recovering the vanadium, tungsten and titanium elements comprises the steps of raw material pretreatment, vanadium separation and recovery, tungsten separation and recovery and titanium recovery; and by means of the recovery process, high-value recovery products such as V2O5, Na2WO4 and titanium-rich slag can be recovered from the waste SCR denitration catalyst. A recovery process hasthe advantages of low cost, the high element recovery rate, excellent recovered product quality, easiness in industrial application and the like, and has the extremely high application value in the field of waste SCR denitration catalyst recovery.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, in particular to a method for recovering vanadium, tungsten and titanium elements from waste SCR denitration catalysts. Background technique [0002] In the context of the country's efforts to control environmental pollution, the relevant standards and regulations on industrial pollutant discharge have become more and more extensive, and the requirements have become more stringent. In recent years, the application of SCR denitrification catalysts has effectively controlled the emission of NOx in the flue gas of the domestic thermal power industry. However, with the introduction of NOx emission standards in more industries, the use of SCR denitrification catalysts has increased year by year, and the resulting large number of waste SCR denitrification catalysts has also brought new environmental threats. [0003] The SCR denitration catalyst is mainly composed of active ingredient V 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B34/12C22B34/36C01G31/02C01G41/00
CPCC22B7/009C22B7/006C22B1/02C22B34/365C22B34/125C01G31/02C01G41/00Y02P10/20
Inventor 陈晨曲艳超陆强
Owner 北京华电光大环境股份有限公司
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