A kind of cement compounded with modified desulfurization ash and rice husk ash

A technology of desulfurization ash and rice husk ash, applied in the direction of cement production, etc., to achieve good dispersion, high dissolution rate, and reduce the consumption of gypsum

Inactive Publication Date: 2017-12-19
葛洲坝武汉道路材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a cement mixed with modified desulfurized ash and rice husk ash, which can simultaneously solve the environmental problems caused by rice husk ash and desulfurized ash, and realize resource utilization of rice husk ash and desulfurized ash

Method used

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  • A kind of cement compounded with modified desulfurization ash and rice husk ash

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Effect test

Embodiment 1

[0029] A cement mixed with modified desulfurized ash and rice husk ash is prepared according to the weight ratio of 70 parts of cement clinker, 20 parts of rice husk ash, 5 parts of modified desulfurized ash, 2 parts of limestone and 3 parts of gypsum. Among them, the preparation method of the modified desulfurization ash is as follows: after mixing and stirring 100 parts of desulfurization ash and 100 parts of water for 30 minutes, it is naturally stored in the room for 30 days, and after preliminary crushing, it is obtained after calcining at 300 ° C for 45 minutes; The preparation method of the husk ash is as follows: first calcining the dried rice husk ash at a temperature of 350°C for 30 minutes, then calcining at a temperature of 600°C for 30 minutes, and then cooling naturally. The results of cement performance tests are shown in Table 1.

Embodiment 2

[0031] A cement mixed with modified desulfurized ash and rice husk ash is prepared according to the weight ratio of 65 parts of cement clinker, 20 parts of rice husk ash, 8 parts of modified desulfurized ash, 5 parts of limestone and 2 parts of gypsum. Among them, the preparation method of the modified desulfurization ash is as follows: 100 parts of desulfurization ash and 120 parts of water are mixed and stirred for 30 minutes, stored in the room for 20 days naturally, after preliminary crushing, and calcined at 300 ° C for 45 minutes to obtain; The preparation method of the husk ash is as follows: first calcining the dried rice husk ash at a temperature of 350°C for 30 minutes, then calcining at a temperature of 600°C for 30 minutes, and then cooling naturally. The results of cement performance tests are shown in Table 1.

Embodiment 3

[0033] A cement mixed with modified desulfurized ash and rice husk ash is prepared according to the weight ratio of 60 parts of cement clinker, 25 parts of rice husk ash, 8 parts of modified desulfurized ash, 4 parts of limestone and 3 parts of gypsum. Among them, the preparation method of the modified desulfurization ash is as follows: 100 parts of desulfurization ash and 120 parts of water are mixed and stirred for 30 minutes, stored in the room naturally for 40 days, and obtained after preliminary crushing and calcining at 300 ° C for 55 minutes; The preparation method of the husk ash is as follows: first calcining the dried rice husk ash at a temperature of 350°C for 30 minutes, then calcining at a temperature of 600°C for 30 minutes, and then cooling naturally. The results of cement performance tests are shown in Table 1.

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Abstract

The invention relates to the field of building materials, in particular to compound doped cement with modified desulfurization ash and rice hull ash. The compound doped cement comprises, by weight, 50-80 parts of cement clinker, 10-40 parts of the rice hull ash, 5-15 parts of the modified desulfurization ash, 1-10 parts of limestone and 1-5 parts of gypsum. A method for modifying the modified desulfurization ash includes mixing and stirring water and sintering flue gas desulfurization ash obtained by the aid of semi-drying processes to obtain mixtures; crushing and calcining the mixtures to obtain the modified desulfurization ash. A method for preparing the rice hull ash includes calcining dry rice hulls; cooling and grinding the rice hulls to obtain the rice hull ash. The compound doped cement has the advantages that the modified desulfurization ash and the rice hull ash are subjected to compound doping to prepare the compound doped cement, accordingly, the rice hull ash and the desulfurization ash can be recycled, a series of environmental problems due to stacking of existing rice hull ash and existing desulfurization ash can be solved, and a novel option of resources of mixtures for cement production can be provided.

Description

technical field [0001] The invention relates to the field of building materials, in particular to cement compounded with modified desulfurized ash and rice husk ash. Background technique [0002] Rice husk ash refers to the residue of rice husk calcined at a certain temperature, which is a by-product of rice processing. The proportion of rice husk accounts for about 20% of the weight of rice, and 0.2 tons of rice husk ash can be obtained by burning 1 ton of rice husk. In 2014 alone, the total rice output in my country reached 172 million tons, which is quite large when converted into rice husk. Random burning of such large-scale rice husks in the past not only caused a great waste of resources but also polluted the environment. At present, they are mainly used as biofuels to generate electricity or provide heat sources. pose a great threat. Studies have shown that the amorphous content of well-calcined rice husk ash is very high, and it is composed of a large number of nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/28C04B7/38
CPCC04B7/243C04B7/38Y02P40/10
Inventor 田孝武丁卫青谢君贾晓娟蔡悟阳邓骞袁斯佳刘飞
Owner 葛洲坝武汉道路材料有限公司
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