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Recovery treatment method of waste SCR denitration catalyst

A denitration catalyst, recycling and processing technology, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc. The effect of reduced acid consumption and convenient operation

Pending Publication Date: 2020-09-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But no matter which method needs to add a large amount of acid to adjust the pH, and in order to fully react, an excessive amount of alkali will be added in the early stage, resulting in a very large consumption of acid and alkali
At the same time, because there are many types of ions in the solution and have some of the same properties, it will also affect WO 3 The purity of the

Method used

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  • Recovery treatment method of waste SCR denitration catalyst
  • Recovery treatment method of waste SCR denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0054] In this example, a waste SCR denitration catalyst from Shanxi A manufacturer was used, in which the molar ratio of calcium to tungsten was 1.2:1. A certain amount of the spent SCR denitration catalyst was washed with a high-pressure water gun, dried at 110° C., and then crushed, ball milled, and sieved to obtain a catalyst powder with a particle size of about 200 mesh. The catalyst powder was calcined at 950°C for 2 hours to obtain CaWO-containing 4 of powder. To the containing CaWO 4 Add 5wt% oxalic acid solution to the powder, wherein H in the oxalic acid solution 2 C 2 o 4 The molar ratio to tungsten in the catalyst powder is 15:1, stirred in a constant temperature water bath at 50°C for 3 hours, and filtered to obtain the filtrate and filter residue. Slowly add 15wt% hydrochloric acid dropwise to the above-mentioned filtrate, stir constantly, and precipitate tungstic acid. WO 3 , its visual diagram, scanning electron microscope (SEM) diagram, X-ray diffractio...

Embodiment 2

[0058] In this example, a spent SCR denitration catalyst from B manufacturer in Shanxi was used, in which the molar ratio of calcium to tungsten was 1.3:1. A certain amount of the spent SCR denitration catalyst was washed with a high-pressure water gun, dried at 100° C., and then crushed, ball milled, and sieved to obtain a catalyst powder with a particle size of about 200 mesh. The catalyst powder was calcined at 850°C for 4 hours to obtain the CaWO-containing 4 of powder. To the containing CaWO 4 Add 10wt% oxalic acid solution to the powder, wherein H in the oxalic acid solution 2 C 2 o 4 The molar ratio to tungsten in the catalyst powder is 5:1, stirred in a constant temperature water bath at 40°C for 4 hours, and filtered to obtain the filtrate and filter residue. Slowly add 20wt% hydrochloric acid dropwise to the above-mentioned filtrate, stir constantly, and precipitate tungstic acid. WO 3 . Add 20 mg of the above-mentioned filter residue to 40 mL of methyl orang...

Embodiment 3

[0062]In this example, a waste SCR denitration catalyst from Shanxi C manufacturer was used, in which the molar ratio of calcium to tungsten was 1.7:1. A certain amount of the spent SCR denitration catalyst was washed with a high-pressure water gun, dried at 120° C., and then crushed, ball milled, and sieved to obtain a catalyst powder with a particle size of about 200 mesh. The catalyst powder was calcined at 850°C for 6h to obtain the CaWO-containing 4 of powder. To the containing CaWO 4 Add 20wt% oxalic acid solution to the powder, wherein H in the oxalic acid solution 2 C 2 o 4 The molar ratio to tungsten in the catalyst powder is 10:1, stirred in a constant temperature water bath at 70°C for 2 hours, and filtered to obtain the filtrate and filter residue. Slowly add 10wt% hydrochloric acid dropwise to the above-mentioned filtrate, stir constantly, and precipitate tungstic acid. WO 3 . Add 30 mg of the above filter residue to 30 mL of methyl orange and rhodamine B ...

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Abstract

The invention provides a method for recycling a waste SCR denitration catalyst, wherein the method comprises the following steps: pretreating the waste SCR denitration catalyst to obtain catalyst powder; carrying out high-temperature calcination treatment on the catalyst powder to obtain an intermediate product; carrying out organic acid solution treatment on the intermediate product, and then filtering to obtain filtrate and filter residues; carrying out concentrated acid treatment on the filtrate to obtain a tungstic acid precipitate; and drying and calcining the tungstic acid precipitate toobtain tungsten trioxide. The method is simple and low in acid-base consumption, high-purity WO3 can be obtained, filter residues obtained after tungsten separation can be used for treating wastewater and degrading organic pollutants in the wastewater, and thus the utilization value of the waste SCR denitration catalyst is further improved.

Description

technical field [0001] The invention relates to the fields of non-ferrous metal recovery and water treatment, in particular to a recovery and treatment method of a waste SCR denitration catalyst. Background technique [0002] Nitrogen oxides (NOx), which mainly come from fixed source boilers and motor vehicle exhaust, are currently one of the main air pollutants in my country, causing serious harm to the ecological environment. 69.8% of NO in our country x Emissions come from the coal-fired industry, and coal-fired power plants, as large coal-burners, are one of the main sources of emissions. Among the numerous nitrogen oxide treatment technologies, selective catalytic reduction (SCR) denitrification technology is widely used in flue gas denitrification of coal-fired power plants due to its advantages of high denitrification efficiency, good selectivity, and less limitation by flue gas components. Catalyst is the core technology of SCR denitrification system, and the cost ...

Claims

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Application Information

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IPC IPC(8): C01G41/02B01J21/06B01J23/42C02F1/32C02F101/30
CPCC01G41/02B01J21/063B01J23/42C02F1/32C01P2004/03C01P2002/72C01P2004/32C01P2004/61C02F2101/308C02F2305/10B01J35/39
Inventor 王建成曹一波胡江亮姚俊轩鲍卫仁
Owner TAIYUAN UNIV OF TECH
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