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A method for preparing porous granular composite materials using red mud and fly ash as raw materials

A technology of composite materials and fly ash, which is applied in the field of preparing porous granular composite materials to achieve the effects of large specific surface area, reduced energy consumption and uniform particle size

Active Publication Date: 2020-10-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing porous granular composite materials by using red mud and fly ash as raw materials through microwave activation. The comprehensive utilization of red mud and fly ash has the advantages of simple preparation process, low energy consumption, environmental friendliness, waste treatment with waste, etc.

Method used

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  • A method for preparing porous granular composite materials using red mud and fly ash as raw materials
  • A method for preparing porous granular composite materials using red mud and fly ash as raw materials

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Effect test

Embodiment 1

[0033] After drying and crushing the red mud from the aluminum plant, pass it through a 100-mesh sieve to make the particle size of the raw material powder relatively uniform and easy to mix fully; according to the sintering method, the mass ratio of red mud, fly ash and cement is 85:10:5 to take a certain quality The raw materials are mixed evenly, and the raw meal granules with a diameter of 5-8mm are made into uniform raw meal particles through a granulator; the raw meal is passed into a microwave activation reactor for curing and activation for 15 minutes, and the power per unit mass is 7.3667w / g. After cooling at room temperature, a granular porous adsorption material with a certain strength can be obtained, and its specific surface area is 17.8372m 2 / g.

Embodiment 2

[0035] After drying and crushing the red mud from the aluminum plant, pass through a 100-mesh sieve to make the particle size of the raw material powder relatively uniform and easy to mix fully; according to the sintering method, the mass ratio of red mud, fly ash and cement is 80:15:5 to take a certain quality The raw materials are mixed evenly, and the raw meal granules with a diameter of 5-8mm are made into uniform raw meal particles through a granulator; the raw meal is passed into the microwave activation reactor for 20 minutes of curing and activation, and the unit mass power is 13.8667w / g. After cooling at room temperature, a granular porous adsorption material with a certain strength can be obtained, and its specific surface area is 19.4283m 2 / g.

Embodiment 3

[0037] After drying and crushing the red mud from the aluminum plant, pass through a 100-mesh sieve to make the particle size of the raw material powder relatively uniform and easy to mix fully; according to the sintering method, the mass ratio of red mud, fly ash and cement is 75:20:5 to take a certain quality The raw materials are mixed evenly, and the raw meal particles with a diameter of 5-8mm are made into uniform raw meal particles through a granulator; the raw meal is passed into a microwave activation reactor for 30 minutes of curing and activation, and the unit mass power is 19.5w / g. After cooling at room temperature, a granular porous adsorption material with a certain strength is obtained, and its specific surface area is 23.2719m 2 / g.

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Abstract

The invention provides a method for preparing a porous granular composite material from red mud and fly ash as raw materials. The method utilizes cement waste as a binder and comprises uniformly mixing fly ash, red mud and the binder according to a mass ratio of fly ash to red mud of 10-30% and a mass ratio of the binder of less than or equal to 5%, carrying out granulation through a granulator toobtain raw material particles with the uniform diameters of 5-8mm, adding the raw material particles into a microwave activation reactor with the unit mass power of 5 to 20w / g, feeding water vapor into the microwave activation reactor, carrying out activation for 15-30min, and carrying out cooling at the room temperature to obtain the porous granular composite material. CaO in the red mud can promote the excitation of the fly ash activity. Through microwave heating, a part of metal oxides and silicon oxide in the red mud and fly ash can increase the particle material strength. The fly ash contains unburned carbon and through the microwave activation, the specific surface area of the particles is increased and the porous structure is formed. The produced porous granular composite materialhas the advantages of large specific surface area, strong adsorption property, good temperature resistance stability, simple processes, low energy consumption and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of strong alkali waste in the alumina industry and coal-based solid waste, in particular to a method for preparing porous granular composite materials using red mud and fly ash as raw materials. Background technique [0002] Red mud is a strong alkaline solid waste produced in the production process of alumina industry. Due to the difference in process and bauxite grade, about 1.0-2.0 tons of red mud is produced in the production of 1 ton of alumina. Red mud has a stable state of chemically bound alkali, high salt content, complex chemical composition and mineral phase composition, so it is difficult to comprehensively utilize. It is mainly stockpiled. In 2015, the global stockpile of red mud was as high as 4 billion tons, with a volume of 120 million t·a －1 The speed increases. China's alumina production in 2016 is about 6100×10 4 t, the discharge of red mud reaches 7000×10 4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10C04B18/04
CPCB01J20/02B01J20/28021C02F1/281C04B28/00C04B40/0218C04B40/024C04B18/0409C04B18/08C04B38/02Y02W30/91
Inventor 王丽萍赵雅琴张家明
Owner CHINA UNIV OF MINING & TECH
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