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Method for preparing microwave absorbing material from red mud and coal gangue and application of microwave absorbing material

A microwave absorbing material, coal gangue technology, which is applied in application, ceramic material production, chemical instruments and methods, etc., can solve the problems of complex process, high cost, low utilization rate, etc., and achieves simple preparation process and enhanced microwave absorption performance. Effect

Active Publication Date: 2021-03-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above utilization methods still have disadvantages such as low utilization rate, complicated process, high cost, and even secondary pollution.

Method used

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  • Method for preparing microwave absorbing material from red mud and coal gangue and application of microwave absorbing material
  • Method for preparing microwave absorbing material from red mud and coal gangue and application of microwave absorbing material
  • Method for preparing microwave absorbing material from red mud and coal gangue and application of microwave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a microwave absorbing material by utilizing red mud and coal gangue, comprising the following steps:

[0028] (1), the red mud slurry that produces in the factory production process is carried out pressure filtration treatment, and the filtrate after pressure filtration treatment is returned to factory as alkali source and continues to use, and the low moisture red mud mass (the weight percentage content of water is 22%) for dispersion treatment, and leave it for later use; wherein, the composition and weight percentage content of the active ingredient red mud in the red mud slurry are: 20wt% SiO 2 , 2wt% CaO, 20wt% Al 2 o 3 , 45wt% Fe 2 o 3 , 10wt%Na 2 O, 3wt%TiO 2 ;

[0029] (2), the coal gangue is crushed, ball milled, and then sieved through a standard sieve to obtain a coal gangue powder with a particle size of 150 meshes, which is reserved for later use; wherein, the composition of the coal gangue and its weight percentage content are:...

Embodiment 2

[0034] A method for preparing a microwave absorbing material by utilizing red mud and coal gangue, comprising the following steps:

[0035](1), the red mud slurry that produces in the factory production process is carried out pressure filtration treatment, and the filtrate after pressure filtration treatment is returned to factory as alkali source and continues to use, and the low moisture red mud mass (the weight percentage content of water is 20%) for dispersion treatment, and leave it for later use; wherein, the composition and weight percentage content of the active ingredient red mud in the red mud slurry are: 15wt% SiO 2 , 8wt% CaO, 25wt% Al 2 o 3 , 40wt% Fe 2 o 3 , 8wt%Na 2 O, 4wt%TiO 2 ;

[0036] (2), the coal gangue is crushed, ball milled, and then sieved through a standard sieve to obtain a coal gangue powder with a particle size of 200 meshes, which is reserved for later use; wherein, the composition and weight percentage of the coal gangue are: 40wt% SiO 2...

Embodiment 3

[0040] A method for preparing a microwave absorbing material by utilizing red mud and coal gangue, comprising the following steps:

[0041] (1), the red mud slurry that produces in the factory production process is carried out pressure filtration treatment, and the filtrate after pressure filtration treatment is returned to factory as alkali source and continues to use, and the low moisture red mud mass (the weight percentage content of water is 22%) for dispersion treatment, and leave it for later use; wherein, the composition and weight percentage content of the active ingredient red mud in the red mud slurry are: 20wt% SiO 2 , 2wt% CaO, 20wt% Al 2 o 3 , 45wt% Fe 2 o 3 , 10wt%Na 2 O, 3wt%TiO 2 ;

[0042] (2), the coal gangue is crushed, ball milled, and then sieved through a standard sieve to obtain a coal gangue powder with a particle size of 200 meshes, which is reserved for later use; wherein, the composition and weight percentage of the coal gangue are: 40wt% SiO ...

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Abstract

The invention relates to a method for preparing a microwave absorbing material from red mud and coal gangue and application of the microwave absorbing material, belonging to the technical fields of solid waste utilization and microwave absorbing materials. The invention aims to solve the technical problem of efficient and reasonable comprehensive utilization of solid waste red mud and coal gangue.According to a technical scheme in the invention, the method comprises the following steps: subjecting red mud slurry to filter pressing and dispersion so as to obtain dispersed red mud balls; crushing, ball-milling and screening coal gangue to obtain coal gangue powder with moderate granularity; respectively weighing the red mud balls and the coal gangue powder according to a certain ratio, andconducting uniform mixing; and finally, carrying out roasting in an inert atmosphere to obtain the magnetic composite microwave absorbing material loaded with Fe3O4, Fe3O4 / Fe, Fe / FeC or elemental Fe.Main phases of the material include fayalite, nepheline and carbon. According to the invention, the solid waste red mud and the coal gangue are used as raw materials to prepare the composite wave-absorbing material, effective recycling of the red mud and the coal gangue is achieved, and reference is provided for comprehensive utilization of the red mud and the coal gangue.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization and microwave absorbing materials, and specifically relates to a method for preparing microwave absorbing materials by utilizing red mud and coal gangue and its application. Background technique [0002] Red mud is a kind of solid waste generated when the aluminum industry refines alumina. As a major producer of alumina in my country, the annual discharge of red mud is as high as 60 million tons, but most of the red mud cannot be recovered well. Reuse, and red mud contains a large amount of alkali and some heavy metal ions, random discharge will directly pollute groundwater and soil. The current common method is to requisition a large area of ​​land to build a dam and lay an isolation and anti-seepage layer to build a red mud reservoir. This not only wastes land resources, but also requires a large amount of money to be invested in the management of the red mud reservoir. In additi...

Claims

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Application Information

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IPC IPC(8): C04B33/132C09K3/00
CPCC04B33/1322C04B33/132C04B33/1328C09K3/00Y02P40/60
Inventor 力国民苏宁静梁丽萍毛璐涛高飞田玉明周毅张克维刘素清
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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