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Aluminate cement and preparation method thereof

A technology of aluminate cement and red mud, which is applied in the field of cement, can solve problems such as high phosphate content, decrease in cement stone strength, and increase in cost, and achieve the effects of high specific surface area, improved hydration performance, and increased load capacity

Inactive Publication Date: 2022-05-10
辛集慕湖混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once cracks are formed, the strength of cement stone will decrease instead, and its phosphate content is high, which will greatly increase the cost

Method used

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  • Aluminate cement and preparation method thereof
  • Aluminate cement and preparation method thereof

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Embodiment 1

[0032] The present embodiment provides a preparation method of aluminate cement, comprising the following steps:

[0033] (1) The preparation of modified fly ash is as follows:

[0034] S1. Preparation of Porous Fly Ash: Mix 100 parts by weight of fly ash, 2 parts by weight of 400-mesh carbon powder, 5 parts by weight of binder and 2 parts by weight of calcium carbonate, add 100 parts by weight of water, stir and mix, 10h, drying, pelletizing, sintering at 1200℃ for 1h to obtain porous fly ash; the binder is a mixture of montmorillonite and starch, and the mass ratio is 3:10;

[0035] S2. the preparation of polydopamine-modified porous fly ash: adding 100 parts by weight of the porous fly ash obtained in step S1, 20 parts by weight of dopamine hydrochloride and 2 parts by weight of Tris-HCl solution with a pH value of 6 into water, Heating to 50°C, stirring for 2h, centrifuging at 3000r / min for 10min, and drying at 70°C for 2h to obtain polydopamine-modified porous fly ash; ...

Embodiment 2

[0041] The present embodiment provides a preparation method of aluminate cement, comprising the following steps:

[0042] (1) The preparation of modified fly ash is as follows:

[0043] S1. preparation of porous fly ash: mix 100 parts by weight of fly ash, 5 parts by weight of 500-mesh carbon powder, 7 parts by weight of binder and 5 parts by weight of calcium carbonate, add 100 parts by weight of water, stir and mix, 20h, drying, pelletizing by pelletizer, sintering at 1400℃ for 2h to obtain porous fly ash; the binder is a mixture of montmorillonite and starch, and the mass ratio is 5:10;

[0044] S2. the preparation of polydopamine-modified porous fly ash: adding 100 parts by weight of the porous fly ash obtained in step S1, 40 parts by weight of dopamine hydrochloride and 10 parts by weight of Tris-HCl solution with a pH value of 6.5 into water, Heating to 70°C, stirring and reacting for 4h, centrifuging at 3000r / min for 10min, and drying at 70°C for 2h to obtain polydopam...

Embodiment 3

[0050] The present embodiment provides a preparation method of aluminate cement, comprising the following steps:

[0051] (1) The preparation of modified fly ash is as follows:

[0052] S1. Preparation of Porous Fly Ash: Mix 100 parts by weight of fly ash, 4 parts by weight of 450-mesh carbon powder, 6 parts by weight of binder and 3.5 parts by weight of calcium carbonate, add 100 parts by weight of water, stir and mix, 15h, drying, pelletizing, sintering at 1300℃ for 1.5h to obtain porous fly ash; the binder is a mixture of montmorillonite and starch, and the mass ratio is 4:10;

[0053] S2. the preparation of polydopamine-modified porous fly ash: adding 100 parts by weight of the porous fly ash obtained in step S1, 30 parts by weight of dopamine hydrochloride and 5 parts by weight of Tris-HCl solution with a pH value of 6.2 into water, Heating to 60°C, stirring and reacting for 3h, centrifuging at 3000r / min for 10min, and drying at 70°C for 2h to obtain polydopamine-modifie...

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Abstract

The invention provides aluminate cement and a preparation method thereof, and belongs to the technical field of cement. The aluminate cement is prepared from the following raw materials: 40-60 parts of red mud, 10-20 parts of limestone, 5-12 parts of phosphogypsum, 12-15 parts of bauxite and 5-12 parts of modified fly ash. The modified fly ash is prepared by processing fly ash into porous fly ash, further modifying the porous fly ash with polydopamine, mixing the modified fly ash with mixed powder of barium oxide, zinc oxide and chromic oxide, and carrying out heating modification reaction. According to the invention, the aluminate cement is prepared by using a sintering method, the obtained product meets the requirements of GB201-2000, the obtained aluminate cement has the advantages of high early strength, high temperature resistance, wear resistance and good sulfate corrosion resistance, the safety of the aluminate cement as a structural component can be ensured, the application range of the aluminate cement is expanded, and the aluminate cement has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to an aluminate cement and a preparation method thereof. Background technique [0002] Aluminate cement is a hydraulic cementitious material with calcium aluminate as the main component, which is obtained by calcining bauxite and limestone as raw materials. Compared with Portland cement, aluminate cement has the advantages of high early strength, high temperature resistance, wear resistance, and sulfate corrosion resistance. It is used in emergency, emergency repair projects, temporary projects, and preparation of heat-resistant concrete. However, aluminate cement is rarely used in the field of structural engineering and mass concrete, mainly because aluminate cement has the problem of strength shrinkage. In the last century, there were many buildings caused by the strength shrinkage of aluminate cement concrete. collapse event. [0003] The reason for the shrinkage of the strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/24C04B7/26
CPCC04B7/32C04B7/24C04B7/26Y02P40/10
Inventor 金金燕
Owner 辛集慕湖混凝土有限公司
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