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Red mud lightweight aggregate as well as preparation method and application thereof

A technology of light aggregate and mud, which is applied in the field of red mud light aggregate and its preparation, can solve the problems of polluting the ecological environment, occupying land resources, and low comprehensive utilization rate of red mud, and achieves excellent alkali corrosion resistance and improved Relative humidity, the effect of solving early shrinkage cracking

Pending Publication Date: 2020-12-11
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the comprehensive utilization rate of red mud is low, and it is mostly disposed of by stockpiling or landfilling, which seriously occupies land resources and pollutes the ecological environment.

Method used

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  • Red mud lightweight aggregate as well as preparation method and application thereof
  • Red mud lightweight aggregate as well as preparation method and application thereof
  • Red mud lightweight aggregate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0031] Table 1 Example 1-5 Proportion of red mud light aggregate (wt%)

[0032]

[0033] Embodiment 1-5 preparation method is as follows (technical process is as follows figure 1 shown):

[0034] (1) Take the raw materials according to the ratio described in Table 1.

[0035] (2) After mixing the raw materials by dry ball milling for 12 hours, pass through a 200-mesh sieve to obtain the mixed powder, add 8wt% tap water to granulate, mix evenly and stale for 30 hours after being isolated from the air, and use a disc ball making machine to prepare the particle size 10mm spherical body.

[0036] (3) Dry the green body prepared in step (2) at 92°C for 48h, then put the green body into a resistance muffle furnace, use a pressureless sintering process to sinter the light aggregate, and keep it at 1150°C for 2h, Then cool down to room temperature with the furnace to get red mud light aggregate. The specific firing process is as follows: figure 2 As shown: when the temperatur...

Embodiment 6

[0038] (1) Weigh 45% of Bayer process red mud, 20% of fly ash, 10% of metakaolin, 15% of talcum powder, 5% of calcium carbonate and 5% of magnesium carbonate.

[0039] (2) After mixing the raw materials by dry ball milling for 12 hours, pass through a 200-mesh sieve to obtain the mixed powder, add 5wt% tap water for granulation, mix well and stale for 36 hours after being isolated from the air, and use a disc ball making machine to prepare the particle size 5mm spherical body.

[0040] (3) Dry the green body prepared in step (2) at 100°C for 48h, then put the green body into a resistance muffle furnace, use the pressureless sintering process to sinter the light aggregate, and keep it at 1000°C for 2h, Then cool down to room temperature with the furnace to get red mud light aggregate. The specific firing heating process is as follows: when the temperature T≤900°C, the heating rate is 5°C / min, and the temperature is kept at 100°C, 300°C, 500°C, 700°C and 900°C for 0.5h; when th...

Embodiment 7

[0042] (1) Weigh 50% of Bayer process red mud, 21% of fly ash, 20% of metakaolin, 5% of talcum powder, 2% of calcium carbonate and 2% of magnesium carbonate.

[0043] (2) After mixing the raw materials by dry ball milling for 12 hours, pass through a 200-mesh sieve to obtain the mixed powder, add 10wt% tap water for granulation, mix well, and stale for 24 hours after being isolated from the air, and use a disc ball making machine to prepare the particle size It is a 20mm spherical blank.

[0044](3) Dry the green body prepared in step (2) at 102°C for 48h, then put the green body into a resistance muffle furnace, use a pressureless sintering process to sinter the light aggregate, and keep it at 1200°C for 2h, Then cool down to room temperature with the furnace to get red mud light aggregate. The specific firing heating process is as follows: when the temperature T≤900°C, the heating rate is 5°C / min, and the temperature is kept at 100°C, 300°C, 500°C, 700°C and 900°C for 0.5h;...

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Abstract

The invention belongs to the technical field of comprehensive utilization of solid wastes, and discloses a red mud lightweight aggregate as well as a preparation method and application thereof. According to the invention, Bayer process red mud, fly ash, metakaolin and talcum powder are used as main raw materials, calcium carbonate and magnesium carbonate are added as pore forming agents, and a proper firing process is matched to prepare the red mud lightweight aggregate with good sintering performance (the volume density is greater than or equal to 1.2. cm<-3>), medium and high mechanical strength (the cylinder compressive strength is greater than or equal to 5.5 MPa), high water absorption rate (greater than or equal to 13%) and excellent alkali corrosion resistance. The red mud lightweight aggregate not only can solve the problem of solid waste red mud treatment, but also can promote the development of light aggregate high-strength concrete, realizes the comprehensive utilization ofa large amount of industrial solid wastes, protects the environment, and has a popularization value.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste, in particular to a red mud light aggregate and its preparation method and application. Background technique [0002] With the development of modern building structures to high-rise and long-span, lightweight aggregate high-strength concrete with high workability, high strength, good volume stability and durability has become a hot spot in the research and application of concrete. At present, the main measures for the high strengthening of lightweight aggregate concrete are the high strengthening of lightweight aggregate and the low water absorption rate, which also leads the development of light aggregate to high mechanical strength and low water absorption rate. However, the low water absorption rate caused by the high strengthening of lightweight aggregate seriously depletes the internal curing effect of pre-wet lightweight aggregate, which reduces the early sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/135C04B33/13C04B38/02C04B18/02
CPCC04B18/027C04B33/13C04B33/1322C04B33/1352C04B38/02C04B2235/3206C04B2235/3208C04B2235/3445C04B2235/5436C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/94C04B2235/96Y02P40/60
Inventor 张高展向玮衡胡成丁庆军候东帅孙道胜杨军王爱国刘开伟
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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