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Bayer process red mud-based filling material as well as preparation method and application thereof

A Bayer method red mud and filling material technology, which is applied in the field of Bayer method red mud-based filling materials and its preparation, can solve problems such as complex process, polluted land and water sources, secondary pollution, etc., and achieve cost reduction, high economic value and The effect of environmental protection value

Active Publication Date: 2020-07-10
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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  • Bayer process red mud-based filling material as well as preparation method and application thereof
  • Bayer process red mud-based filling material as well as preparation method and application thereof
  • Bayer process red mud-based filling material as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0035] S2) the preparation of solid alkali material;

[0036] S3) red mud and fly ash after S1) treatment, S2) obtain solid alkali material and cement to obtain solid phase material, and solid phase material and water are stirred together to obtain filling slurry, which is Bayer method red mud base filling Material.

[0037] The concrete steps of described S1) are:

[0038] S1.1) first place the Bayer process red mud in a drying box, dry to constant quality at a temperature of 55-70 ° C, grind it finely, pass through a 1.18mm fine sieve, and install a moisture-proof bag for later use;

[0039] S1.2) Place the fly ash in a drying box, dry it at a temperature of 55-70° C. to a constant quality, and install a moisture-proof bag for later use.

[0040] The concrete steps of described S2) are:

[0041] S2.1) Weigh inorganic salts, organic acids and neutral mineral admixtures respectively, and mix them evenly to obtain solid alkali materials, wherein the mass between the inorgani...

Embodiment 1

[0048] Dry the Bayer process red mud and fly ash, put them in a moisture-proof bag for later use, and accurately measure the weight of various materials according to the test ratio of 4:6:0.7:0.3. Inorganic salts in solid alkali materials: organic acid: medium The ratio of mineral admixtures is 1:1:3. First mix the solid phase materials and pour them into the mortar mixer, then add water, and the mortar mixer is stirred for 4 minutes at a revolution speed of 125±5r / min.

Embodiment 2

[0050]Dry the Bayer process red mud and fly ash, put them in a moisture-proof bag for later use, and accurately weigh the weight of various materials according to the test ratio. The raw material ratio scheme is shown in Table 1. : The ratio of neutral mineral admixture is 2:2:6. First mix the solid phase materials and pour them into the mortar mixer, then add water, and the mortar mixer is stirred for 4 minutes at a revolution speed of 125±5r / min. After stirring, pour the filling material into a standard test mold evenly spread with butter, vibrate evenly, and scrape it flat. After being placed at room temperature for 24 hours, the mold was demolded, and the test block was put into a standard curing box and cured for 3d, 7d, and 28d respectively, and the compressive strength of the test block at each age was tested. The test results are shown in Table 1. The test block that has been cured for 28 days is tested for the moisture content of the test block, and the leaching test...

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Abstract

The invention belongs to the field of Bayer process red mud-based filling materials, and particularly relates to a Bayer process red mud-based filling material for reducing the harm of alkali in the filling material to the environment and improving the compressive strength of the filling material and a preparation method thereof. A basic filling material of the Bayer process red mud-based fillingmaterial comprises the followings components in parts by weight: 30-60 parts of red mud, 40-60 parts of fly ash and 5-15 parts of cement. A solid alkali material of the Bayer process red mud-based filling material is prepared from the following components in parts by weight: 10-30 parts of inorganic salt, 10-30 parts of organic acid and 50-70 parts of neutral mineral admixture. According to the Bayer process red mud-based filling material prepared by the method, the 3d strength is greater than 1MPa, and the 28d strength is greater than 3MPa. Through the composite excitation effect of the fly ash, the cement and the Bayer process red mud and the adjustment of the solid alkali material on alkali dissolution, the underground environment is simulated, and the filler leaching water completely meets the requirements of the environmental water quality class-III standard. Green utilization of the Bayer process red mud is fully realized, the cost of the filling material is reduced, and the filling material has high economic value and environmental protection value.

Description

technical field [0001] The invention belongs to the field of Bayer process red mud base filling materials, in particular to a Bayer process red mud base filling material and a preparation method thereof for reducing the environmental damage caused by alkali in the filling material and improving the compressive strength of the filling material. 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 stored in stockpiles. During the stockpiling process, it will pollute the land and water sources, and at the same time, it has a high potential safety hazard. 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 handled properly, it is easy to cause secondary pollution. In order to make full use of the alkali in red mud and control the alkali overflow phe...

Claims

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Application Information

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Patent Type & Authority Applications(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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