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Catalyst prepared from red mud for removing volatile organic compound and preparation method of catalyst

A catalyst and red mud technology, applied in the field of solid waste treatment and application, to reduce production costs and solve environmental problems

Active Publication Date: 2018-05-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention not only solves the problem of red mud treatment, but also reduces the cost of the existing catalytic oxidation catalyst for removing complex components of volatile organic waste gas, and achieves the purpose of treating waste with waste

Method used

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  • Catalyst prepared from red mud for removing volatile organic compound and preparation method of catalyst
  • Catalyst prepared from red mud for removing volatile organic compound and preparation method of catalyst
  • Catalyst prepared from red mud for removing volatile organic compound and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This example provides a method for preparing a catalyst for removing volatile organic compounds from red mud, and the specific method is as follows:

[0072](a) 100g of red mud is pulverized and added to 300g of dilute sulfuric acid with a concentration of 50%. It is reacted at 80°C for 12h for acidolysis. The hydrogen ion concentration of the reaction system is 28.9mol / L. After the acidolysis reaction is completed, The resulting slurry was aged at a low temperature of 5°C for 24 hours, and the aged slurry was subjected to high-speed centrifugation at a speed of 20,000 r / min to obtain a separated liquid and a solid, which was then washed 3 times with 50% dilute sulfuric acid for use in other apps;

[0073] (b) Add ammonia water dropwise to the separation liquid, adjust the pH value of the solution to be about 9, filter and separate the obtained slurry to obtain filtrate and filter residue, the filtrate is used for other applications, and filter, wash and dry the filter ...

Embodiment 2

[0081] This example provides a method for preparing a catalyst for removing volatile organic compounds from red mud, and the specific method is as follows:

[0082] (a) 100g of red mud is pulverized and added to 300g of dilute sulfuric acid with a concentration of 50%. It is reacted at 80°C for 12h for acidolysis. The hydrogen ion concentration of the reaction system is 28.9mol / L. After the acidolysis reaction is completed, The resulting slurry was aged at a low temperature of 5°C for 24 hours, and the aged slurry was subjected to high-speed centrifugation at a speed of 20,000 r / min to obtain a separated liquid and a solid, which was then washed 3 times with 50% dilute sulfuric acid for use in other apps;

[0083] (b) Add ammonia water dropwise to the separation liquid to adjust the pH value of the solution to about 9, filter and separate the obtained slurry to obtain a filtrate and a filter residue, the filtrate is used for other applications, filter, wash and dry the filter ...

Embodiment 3

[0092] This example provides a method for preparing a catalyst for removing volatile organic compounds from red mud, and the specific method is as follows:

[0093] (a) 300g of red mud is pulverized and added to 300g of dilute sulfuric acid with a concentration of 80%. It is reacted at 70°C for 12h for acidolysis. The hydrogen ion concentration of the reaction system is 35.14mol / L. After the acidolysis reaction is completed, The resulting slurry was aged at a low temperature of 10°C for 5 hours, and the aged slurry was subjected to high-speed centrifugation at a speed of 20,000 r / min to obtain a separated liquid and a solid, and the solid was washed three times with 50% dilute sulfuric acid for use in other apps;

[0094] (b) Add ammonia water dropwise to the separating liquid, adjust the pH value of the solution to be about 8.5, filter and separate the obtained slurry to obtain filtrate and filter residue, the filtrate is used for other applications, and obtain iron-titanium ...

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Abstract

The invention provides a catalyst prepared from red mud for removing a volatile organic compound and a preparation method of the catalyst. The method comprises the following steps that 1, acid is added in the red mud, acidolysis leaching is conducted, first slurry is obtained after acidolysis, the first slurry is acidic, the first slurry is subjected to ageing, solid-liquid separation is conducted, and then a solid and separation liquid are obtained; 2, the pH of the separation liquid in step 1 is adjusted to be larger than or equal to 8.5, second slurry is obtained, the second slurry is subjected to solid-liquid separation to take a solid, and the obtained solid is an iron, titanium and aluminum composite precursor; 3, the iron, titanium and aluminum composite precursor obtained in step 2is calcined to obtain an iron, titanium and aluminum catalyst. In step 3, the iron, titanium and aluminum composite precursor serves as a carrier, noble metal is loaded on the iron, titanium and aluminum composite precursor, and a noble metal / iron, titanium and aluminum catalyst can be obtained. According to the preparation method, the steps are simple, high-value utilization of the red mud is achieved, and a wide industrial application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and application, and relates to a catalyst for removing volatile organic compounds prepared from red mud and a preparation method thereof. Background technique [0002] Red mud is a polluting and insoluble waste slag discharged during the process of extracting alumina from bauxite in the aluminum industry, and is a bulk solid waste discharged in the nonferrous metallurgical industry. Red mud is strongly alkaline, with a pH value of 13.0-14.0, and has become the largest source of pollution in the production of alumina. According to statistics, every ton of alumina produced will produce 1-2 tons of red mud. As the fourth largest producer of alumina in the world, China discharges millions of tons of red mud every year. The current stock of red mud is nearly 400 million. Utilization is only about 15%. Red mud is generally piled in the open air in the form of cement dams. This treatment method n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/89B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J23/745B01J23/8906B01J2523/00B01J2523/47B01J2523/824B01J2523/842B01J2523/31Y02A50/20
Inventor 郭凤余剑李长明
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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