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Method for preparing microporous aluminum-silicon-calcium thermal insulation material by autoclaved activation of Bayer process red mud

A technology of Bayer process red mud and thermal insulation material, which is applied in the field of autoclaving activated Bayer process red mud to prepare microporous aluminum-silicon-calcium thermal insulation materials, and achieves the effects of reducing product damage, indicating strength and ensuring stable performance.

Inactive Publication Date: 2021-01-08
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no mature preparation method for preparing microporous aluminum-silicon-calcium thermal insulation materials by using red mud on a large scale

Method used

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  • Method for preparing microporous aluminum-silicon-calcium thermal insulation material by autoclaved activation of Bayer process red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Powder material raw material composition: red mud 8kg, fly ash 45kg, cement 10kg, lime 8kg, gypsum 2kg; the amount of water added is 45% of the total weight of the powder material.

[0028] The method for preparing microporous aluminum-silicon-calcium thermal insulation material by autoclaving activated Bayer process red mud comprises the following steps:

[0029] Add the powder material into water and stir, and after stirring evenly to form a slurry, foam at 40°C for 8 hours under normal pressure, and then steam for 6 hours under 0.8MPa pressure, and the steam temperature is 170°C.

[0030] The microporous aluminum-silicon-calcium thermal insulation material was prepared with the formula and preparation method of Example 1, and the prepared microporous aluminum-silicon-calcium thermal insulation material was tested and found to have a density of 555kg / m 3 , the strength is 4.2MPa, and the thermal conductivity is 0.1080W / mK.

Embodiment 2

[0032] Raw material composition of powder material: 20kg of red mud, 70kg of fly ash, 25kg of cement, 12kg of lime, 5kg of gypsum; the amount of water added is 70% of the total weight of the powder material.

[0033] The method for preparing microporous aluminum-silicon-calcium thermal insulation material by autoclaving activated Bayer process red mud comprises the following steps:

[0034] Add the powder material into water and stir, and at the same time add a water reducer equivalent to 0.5% of the weight of the powder material, stir evenly to form a slurry, foam at 60°C under normal pressure for 16 hours, and then steam-cure under 1.4MPa pressure 12h, the water vapor temperature is 195°C.

[0035] The microporous aluminum-silicon-calcium thermal insulation material was prepared with the formula and preparation method of Example 2, and the prepared microporous aluminum-silicon-calcium thermal insulation material was tested and found to have a density of 620kg / m 3 , the stre...

Embodiment 3

[0037] Raw material composition of the powder material: red mud 12kg, fly ash 60kg, cement 16kg, lime 10kg, gypsum 3kg; the amount of water added is 60% of the total weight of the powder material.

[0038] The method for preparing microporous aluminum-silicon-calcium thermal insulation material by autoclaving activated Bayer process red mud comprises the following steps:

[0039] Add the powder material into water and stir, and add a water reducing agent equivalent to 0.3% of the weight of the powder material at the same time, after stirring evenly to form a slurry, foam at 50°C under normal pressure for 12 hours, and then steam curing under 1.1MPa pressure 8h, the water vapor temperature is 184°C.

[0040] The water reducer is polycarboxylate water reducer.

[0041] The microporous aluminum-silicon-calcium thermal insulation material was prepared with the formula and preparation method of Example 3, and the prepared microporous aluminum-silicon-calcium thermal insulation mat...

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Abstract

The invention aims to provide a method for preparing a microporous aluminum-silicon-calcium thermal insulation material by autoclaved activation of Bayer process red mud, which comprises the followingsteps of adding a powder material into water, stirring, adding a water reducing agent accounting for 0-0.5% of the weight of the powder material, uniformly stirring to form slurry, foaming under normal pressure, and carrying out steam curing under high pressure to obtain the microporous aluminum-silicon-calcium thermal insulation material. The powder material comprises the following raw materialsin parts by weight: 8-20 parts of red mud, 45-70 parts of fly ash, 10-25 parts of cement, 8-12 parts of lime and 2-5 parts of gypsum. The method disclosed by the invention is simple to operate and good in repeatability, and the raw materials in the formula can be processed into the high-quality microporous aluminum-silicon-calcium thermal insulation material.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial waste resources, and in particular relates to a method for preparing microporous aluminum-silicon-calcium thermal insulation materials by autoclaving and activating Bayer process red mud. Background technique [0002] Red mud is the main solid waste in the alkaline production of alumina. my country is a big producer of alumina, and the accumulated accumulation of red mud has reached hundreds of millions of tons, and most of them adopt the method of open-air damming. This red mud disposal method not only occupies land resources, but also causes soil pollution, affecting the health of humans, animals and plants. Although there are research papers on the application of red mud to the preparation of ceramic materials, glass-ceramics, roadbed materials, unburned bricks, cement and concrete, etc., there are few reports on actual large-scale application projects. Therefore, the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/12C04B38/02C04B18/04B28B11/24C04B111/40
CPCB28B11/245C04B18/0409C04B28/12C04B38/02C04B2111/00017C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B7/00C04B18/08C04B22/143C04B2103/302C04B22/04C04B2103/48Y02W30/91
Inventor 吴海文张正林徐强于铁妮
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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