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A kind of Bayer process red mud base filling material and preparation method thereof

A Bayer process red mud and filling material technology, which is applied in the field of Bayer process red mud base filling materials and its preparation, can solve the problems of polluted land and water sources, complicated processes, hidden safety hazards, etc., and achieves high economic value and environmental protection value. cost reduction effect

Active Publication Date: 2021-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Red mud is a strong alkaline solid waste produced in the process of refining alumina from bauxite. At present, it is mainly stockpiled. During the stockpiling process, it will pollute land and water sources, and at the same time, it has high potential safety hazards.
In order to improve the utilization rate of red mud, lime milk is used to dealkalize red mud under different processes. The process is more complicated. If the remaining lye is not handled properly, it will easily cause secondary pollution.

Method used

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  • A kind of Bayer process red mud base filling material and preparation method thereof
  • A kind of Bayer process red mud base filling material and preparation method thereof
  • A kind of Bayer process red mud base filling material and preparation method thereof

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preparation example Construction

[0034] S2) preparation of solid alkali material;

[0035] S3) The red mud and fly ash after S1) are processed, and S2) is obtained from solid alkali material and cement to obtain solid phase material, and the solid phase material and water are stirred together to obtain filling slurry, which is Bayer red mud-based filling Material.

[0036] The specific steps of said S1) are:

[0037] S1.1) First put the Bayer process red mud in a drying box, dry it at a temperature of 55-70°C until the quality is constant, grind it finely, pass it through a 1.18mm fine sieve, and put it in a moisture-proof bag for later use;

[0038] S1.2) Put the fly ash in a drying box, dry it at a temperature of 55-70°C until the quality is constant, and put it in a moisture-proof bag for later use.

[0039] The specific steps of said S2) are:

[0040] S2.1) First take the inorganic salt, organic acid and neutral mineral admixture by weighing respectively, and mix uniformly to obtain the solid alkali ma...

Embodiment 1

[0047] First dry the Bayer process red mud and fly ash, put them in a moisture-proof bag for later use, and accurately weigh the Bayer process red mud, fly ash, cement and solid alkali materials according to the test ratio of 4:6:0.7:0.3 , among which, the ratio of inorganic salt: organic acid: neutral mineral admixture in the solid alkali material is 1:1:3; then mix Bayer process red mud, fly ash, cement and solid alkali material and pour them into the mortar mixer , and then add water, and the mortar mixer stirs for 4 minutes at a revolution speed of 125±5r / min.

Embodiment 2

[0049]First dry the Bayer process red mud and fly ash, put them in moisture-proof bags for later use, and accurately weigh the weights of various materials according to the test ratio. The ratio of raw materials is shown in Table 1. Inorganic salts in solid alkali materials: organic Acid: neutral mineral admixture ratio is 2:2:6. First mix the solid phase material evenly and pour it into the plastic sand mixer, then add water, and the plastic sand mixer stirs for 4 minutes at the revolution speed of 125±5r / min. After the stirring is completed, pour the filling material into a standard test mold that is evenly coated with butter, vibrate evenly, and scrape it evenly. After being placed at room temperature for 24 hours, the mold was demoulded, and the test blocks were placed in a standard curing box for 3 days, 7 days, and 28 days, respectively, and the compressive strength of the test blocks at each age was tested. Test the moisture content of the test block that has been cure...

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Abstract

The invention belongs to the field of Bayer-process red mud-based filling materials, in particular to a Bayer-process red mud-based filling material for reducing the environmental hazards of alkali in the filling material and improving the compressive strength of the filling material and a preparation method thereof. Bayer method red mud-based filling materials include basic filling materials in parts by weight: 30-60 parts of red mud, 40-60 parts of fly ash, 5-15 parts of cement; parts by weight of solid alkali materials: inorganic salt 10 ‑30 parts, 10‑30 parts of organic acid, 50‑70 parts of neutral mineral admixture. The Bayer process red mud-based filling material prepared by the invention has a 3d strength greater than 1 MPa and a 28d strength greater than 3 MPa. Through the combined excitation of fly ash, cement, and Bayer process red mud and the adjustment of alkali leaching by solid alkali materials, the underground environment is simulated, and the leaching water of filling materials fully meets the requirements of environmental water quality class III standards. The Bayer process red mud has fully realized the green utilization, and at the same time reduced the cost of filling materials, and has high economic value and environmental protection value.

Description

technical field [0001] The invention belongs to the field of Bayer-process red mud-based filling materials, in particular to a Bayer-process red mud-based filling material for reducing the environmental hazards of alkali in the filling material and improving the compressive strength of the filling material and a preparation method thereof. Background technique [0002] Red mud is a strong alkaline solid waste produced in the process of refining alumina from bauxite. At present, it is mainly stockpiled. During the stockpiling process, it will pollute land and water sources, and at the same time it has high potential safety hazards. In order to improve the utilization rate of red mud, lime milk is used to dealkalize red mud under different processes. The process is more complicated, and if the remaining lye is not properly treated, it will easily cause secondary pollution. In order to make full use of the alkali in the red mud and control the alkali overflow phenomenon of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/04
CPCC04B18/0409C04B28/04C04B2201/50C04B18/08C04B22/142C04B24/04C04B24/06C04B18/12Y02W30/91
Inventor 刘娟红周在波吴爱祥王贻明吴瑞东王少勇
Owner UNIV OF SCI & TECH BEIJING
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