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Recovery method for SCR waste flue gas denitration catalyst

A technology of denitrification catalyst and recovery method, which is applied in the field of recovery of SCR waste gas denitrification catalyst, can solve the problems that the comprehensive recovery of waste SCR flue gas denitrification catalyst cannot be applied, achieve good economic and environmental benefits, low cost, and improve the environment The effect of the situation

Active Publication Date: 2014-01-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that most of the currently retrieved waste catalyst recovery process patents are for hydrodesulfurization catalysts in the petrochemical field. The use of catalysts in these two fields, the composition and properties of impurities are quite different, and these methods cannot Application in comprehensive recovery of waste SCR flue gas denitrification catalyst

Method used

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  • Recovery method for SCR waste flue gas denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Such as figure 1 Shown: the method for recovering metal oxides from the flue gas denitrification catalyst in this embodiment adopts the process of hydrometallurgy and proceeds according to the following steps.

[0053] Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitrification catalyst and put it into the rotary. Carry out high-temperature roasting at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 4 hours.

[0054] Pulverization: Put the waste flue gas denitrification catalyst after high-temperature roasting into a crusher, and pulverize it to a particle size of ≤ 200 μm to obtain a uniform powder.

[0055] Hot water leaching: After the agglomerates roasted at high temperature are pulverized by a pulverizer, they are leached with hot water at 80~90°C under sufficient stirring to dissolve part of the solids in water. The water consumption is a liquid-solid weight...

Embodiment 2

[0061] Example 2: Such as figure 1 Shown: the method for recovering metal oxides from the flue gas denitrification catalyst in this embodiment adopts the process of hydrometallurgy and proceeds according to the following steps.

[0062]Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitrification catalyst and put it into the rotary machine, perform high-temperature roasting at 680°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature constant for 3.5 hours.

[0063] Pulverization: Put the waste flue gas denitrification catalyst after high-temperature roasting into a crusher, and pulverize it to a particle size of ≤ 200 μm to obtain a uniform powder.

[0064] Hot water leaching: After the agglomerates roasted at high temperature are pulverized by a pulverizer, they are leached with hot water at 80~90°C under sufficient stirring to dissolve part of the solids in water. The water consumption is a liq...

Embodiment 3

[0069] Example 3: Such as figure 1 Shown: the method for recovering metal oxides from the flue gas denitrification catalyst in this embodiment adopts the process of hydrometallurgy and proceeds according to the following steps.

[0070] Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitrification catalyst and put it into the rotary machine, and perform high-temperature roasting at 700°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours.

[0071] Pulverization: Put the waste flue gas denitrification catalyst after high-temperature roasting into a crusher, and pulverize it to a particle size of ≤ 200 μm to obtain a uniform powder.

[0072] Hot water leaching: After the agglomerates roasted at high temperature are pulverized by a pulverizer, they are leached with hot water at 80~90°C under sufficient stirring to dissolve part of the solids in water. The water consumption is a liquid-so...

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Abstract

The invention relates to a recovery method for an SCR waste flue gas denitration catalyst, and adopts a hydrometallurgy process. After the SCR waste flue gas denitration catalyst is smashed and subjected to pre-calcination treatment, a NaOH solution is added according to a ratio for dissolution. After the catalyst is dissolved, solid-liquid separation is performed, sulfuric acid is added into the obtained precipitation, and the precipitation is steeped, precipitated, hydrolyzed, subjected to salt treatment, and calcinated to obtain TiO2. Sulfuric acid is added into the solution obtained from the first solid-liquid separation to adjust the pH value, excess ammonium nitrate is added to precipitate vanadium, and second solid-liquid separation is performed. Ammonium metavanadate obtained from filtration is subjected to pre-calcination to obtain a V2O5 finished product. Hydrochloric acid is added into the solution obtained from the second solid-liquid separation to adjust the pH value, and NaCl is added to obtain sodium tungstate. The sodium tungstate is subjected to purification, filtration, ion exchange, and other processes to separate impurities, and subjected to evaporative crystallization to obtain a sodium tungstate finished product. The method provided by the invention is simple in technology, general in equipment, easily available in raw material, low in cost and high in recovery rate.

Description

technical field [0001] The invention relates to a method for recovering SCR waste flue gas denitrification catalyst, which adopts the process of hydrometallurgy and belongs to the field of non-ferrous metal recovery. Background technique [0002] Since the reform and opening up, my country's power industry has developed vigorously. In 2005, my country's installed power generation capacity has exceeded 450 million kW. According to statistics, more than 90% of NO in my country's air pollutants x Originated from the combustion process of fossil fuels (such as coal, oil, natural gas, etc.), 70% of which comes from the combustion of coal, and the coal used for power generation in thermal power plants accounts for 70% of the country's coal combustion. By 2005, the national NO x The total emissions have reached about 18 million tons, and the emissions from the power industry account for about 1 / 2. According to the current emission control level, in 2020 China's NO x Emissions ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/36C22B34/12C22B3/46
CPCY02P10/20
Inventor 霍怡廷常志东董彬李文军
Owner UNIV OF SCI & TECH BEIJING
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