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Red mud and aluminum ash based steam-curing-free aerated concrete and preparation method thereof

An air-entrained concrete, steam-free technology, applied in the field of air-entrained concrete, can solve the problems of high energy consumption of air-entrained concrete, difficulty in viscous foaming of freshly mixed red mud slurry, etc., and achieve the effect of efficient utilization

Inactive Publication Date: 2019-03-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention firstly completely solved the problem of efflorescence of red mud building material products, and also solved the problem of viscous foaming of freshly mixed red mud slurry. Secondly, it realized the efficient utilization of elemental aluminum in aluminum ash, and finally solved the problem of traditional The problem of high energy consumption of air-entrained concrete

Method used

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  • Red mud and aluminum ash based steam-curing-free aerated concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A red mud, aluminum ash-based non-steam-curing aerated concrete. The aerated concrete is made of a powder material mixed with an appropriate amount of water and aged and foamed at room temperature; water accounts for 50% of the powder material, and the water reducer accounts for 1% of powder material;

[0034] Wherein, the components and their mass fractions in the powder material are: 20% calcareous gelling material, 15% aluminum ash, and 65% red mud.

[0035] 1) Add water and stir and mix the powder material according to the formula of Example 1 to prepare a slurry;

[0036] 2) Pour the slurry obtained in step 1) into the mold for foaming, and then stop and cure at room temperature for 1-3 hours to thicken;

[0037] 3) After the static stop curing, the test piece is demoulded and cut to obtain the green body of the required size; then the green body is naturally cured for 7 days to obtain the finished product.

Embodiment 2

[0039] A red mud, aluminum ash-based non-steam-curing aerated concrete. The aerated concrete is made of a powder material mixed with an appropriate amount of water and aged and foamed at room temperature; water accounts for 40% of the powder material, and the water reducer accounts for 0.75% of powder material;

[0040] Wherein, the components and their mass fractions in the powder material are: 25% calcareous gelling material, 25% aluminum ash, and 50% red mud.

[0041] 1) Add water and stir and mix the powder material according to the formula of Example 2 to prepare a slurry;

[0042] 2) Pour the slurry obtained in step 1) into the mold for foaming, and then stop and cure at room temperature for 1-3 hours to thicken;

[0043] 3) After the static stop curing, the test piece is demoulded and cut to obtain the green body of the required specification and size; then the green body is naturally cured for 7 days to obtain the finished product.

Embodiment 3

[0045] A kind of red mud, aluminum ash-based non-steam-curing aerated concrete. The aerated concrete is made of powder materials and appropriate amount of water to mix the slurry at room temperature for aging and foaming; water accounts for 30% of the powder materials, and the water reducer accounts for 0.5% of powder material;

[0046] Wherein, the components and their mass fractions in the powder material are: 30% calcareous gelling material, 30% aluminum ash, and 40% red mud.

[0047] 1) Add water and stir and mix the powder material according to the formula of Example 3 to prepare a slurry;

[0048] 2) Pour the slurry obtained in step 1) into the mold for foaming, and then stop and cure at room temperature for 1 to 3 hours to thicken;

[0049] 3) After the static stop curing, the test piece is demoulded and cut to obtain the green body of the required specification and size; then the green body is naturally cured for 7 days to obtain the finished product.

[0050]Accordi...

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Abstract

The invention provides a red mud and aluminum ash based steam-curing-free aerated concrete and a preparation method thereof. The aerated concrete is prepared through the following steps: adding a proper amount of water into a powder material, carrying out blending at a normal temperature so as to prepare a slurry, and carrying out aging and foaming. According to the invention, the mass of water accounts for 30 to 50% of the mass of the powder material; the mass of a water reducing agent accounts for 0.5 to 1% of the mass of the powder material; and the powder material comprises the following components by mass: 20 to 30% of a calcium cementing material, 15 to 30% of aluminum ash and 40 to 65% of red mud. According to a technical scheme of the invention, the red mud is utilized to react with the calcium cementing material at a normal temperature to establish mechanical strength; elemental aluminum in the aluminum ash is utilized to react with strong alkali in the red mud to generate hydrogen gas for foaming expansion; and the elemental aluminum in the aluminum ash eliminates the strong alkali in the red mud. Thus, the problem of efflorescence of a red mud building material product is solved, and highly-efficient utilization of the elemental aluminum in the aluminum ash is realized. Meanwhile, through proper increase of the calculation amount of the aluminum ash, the rate of foaming and the viscosity of the slurry are balanced, and the problem of difficult foaming due to viscousness of a red mud fresh slurry is solved.

Description

Technical field: [0001] The invention relates to the technical field of aerated concrete, in particular to red mud and aluminum ash-based non-steamed aerated concrete and a preparation method thereof. Background technique: [0002] At present, the research on the comprehensive utilization of red mud mainly focuses on the extraction of building materials, environmental materials, valuable metals and the preparation of other composite materials. However, one of the characteristics of red mud waste is large discharge and extremely low comprehensive utilization rate (about 6%). However, using red mud as an environmental material, extracting its valuable metals and preparing composite materials, although the added value is high, the consumption of red mud is very small, and so far, there is no industrialized technology. Therefore, it is difficult to solve the potential hazards of red mud in a short time. [0003] The key to solving the problem is to solve the large discharge of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B38/02
CPCC04B28/10C04B2201/20C04B2201/32C04B2201/50C04B7/02C04B18/0409C04B22/04C04B22/0006C04B2103/302C04B38/02
Inventor 姬永生陈鑫冰时方鸣郭煜诚陈豪徐之山周样梅严久鑫刘本琳石博文刘翔宇张莉吴守荣徐圣楠
Owner CHINA UNIV OF MINING & TECH
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