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A method for comprehensive utilization of waste scr denitrification catalyst

A technology of SCR catalyst and denitration catalyst, which is applied in the field of comprehensive utilization of waste SCR denitration catalyst, can solve the problem of large amount of SCR catalyst disposal, and achieve comprehensive utilization, high purity, simple and reliable process

Active Publication Date: 2016-03-02
CHENGDU JIUZHOU LIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since SCR catalysts are replaced every three years, the amount of SCR catalysts that need to be disposed of is huge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take a discarded honeycomb SCR catalyst from a power plant, use a high-pressure air gun to purge the surface and pores of the SCR catalyst block, spray water to clean the block pores, and put it in a blast drying oven for drying at a drying temperature of 95°C , the drying time is 3 hours, and then crushed to 200 mesh; immerse the waste SCR catalyst powder in a quantitative 3% oxalic acid solution, stir, react for 5 hours and then filter, evaporate the filtrate to dryness to obtain a solid vanadyl oxalate; then immerse the filter residue obtained in the previous step into a quantitative 20% sodium hydroxide solution, stirred, reacted at 90°C for 10h and then filtered, the filter residue was replaced with TiO 2 Mainly, it is used as a high-quality building material raw material after drying; the filtrate is tungstate or molybdate solution, and then the pH value of the filtrate is adjusted to 6 with hydrochloric acid, and then filtered, the precipitate is tungstic acid or ...

Embodiment 2

[0016] Take a discarded honeycomb SCR catalyst from a power plant, use a high-pressure air gun to purge the surface and pores of the SCR catalyst block, spray water to clean the block pores, and put it in a blast drying oven for drying at a drying temperature of 95°C , the drying time is 3 hours, and then crushed to 200 mesh; immerse the waste SCR catalyst powder in quantitative 3% oxalic acid+sulfuric acid solution, stir, filter after reacting for 3 hours, and obtain vanadyl oxalate solid after the filtrate is evaporated to dryness; then filter residue obtained in the previous step Immerse in a quantitative 20% sodium hydroxide + sodium carbonate solution, stir, react at 90°C for 8 hours and then filter, the filter residue is replaced with TiO 2 Mainly, it is used as a high-quality building material raw material after drying; the filtrate is tungstate or molybdate solution, and then the pH value of the filtrate is adjusted to 6 with sulfuric acid, and then filtered, the precip...

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Abstract

The invention relates to a comprehensive utilization method for a waste SCR denitration catalyst. The method comprises the following steps: pretreatment of the waste SCR denitration catalyst; crushing of the waste SCR denitration catalyst; extraction of vanadium from the waste SCR denitration catalyst through leaching with an acid solution; extraction of tungsten or molybdenum from the waste SCR denitration catalyst through leaching with an alkali lye; utilization of TiO2; etc. Thus, resource utilization and harmless disposal of the waste SCR denitration catalyst is realized. The method mainly employs a wet process, is simple and reliable, allows products to have great utilization values and realizes comprehensive utilization of the waste SCR denitration catalyst.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of waste catalysts, in particular to a method for comprehensive utilization of waste SCR denitration catalysts. Background technique [0002] China is a country that consumes a lot of energy mainly by thermal power generation. It emits a large amount of nitrogen oxides while burning coal. If the control is not strengthened, the consequences of air pollution in our country will become more and more serious. According to the data provided by the China Environmental Monitoring Center, in 2011 my country's total nitrogen oxide emissions were 24.043 million tons, of which the power industry's nitrogen oxide emissions accounted for more than 45%, accounting for more than half of the total emissions of various combustion devices, while the power industry More than 80% of the nitrogen oxides emitted by the industry are emitted by coal-fired boilers. . [0003] In order to reduce nitrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 魏昭荣邓令罗显刚韦巍
Owner CHENGDU JIUZHOU LIYUAN TECH
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