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Method for preparing sulfoaluminate cement clinker by using five-component mineral phase system

A technology of sulfoaluminate cement and mineral phase, applied in cement production, clinker production, etc., can solve the problems of low hardness of fluorite, environmental hazards, decrease in hardness and toughness, etc.

Active Publication Date: 2015-01-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a mineralizer, fluorite can reduce the sintering temperature of the charge, but the hardness of fluorite is low and brittle, which makes the hardness and toughness of concrete mixed with fluorite decrease; at the same time, the incorporation of fluorite increases Therefore, it is very meaningful to develop Alite-sulfoaluminate cement with unchanged performance without adding fluorite.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: 78% limestone, 6% sandstone, 1.5% fly ash, 8.5% low-grade bauxite (Al 2 o 3 The mass percentage is 45.9%), and 6% gypsum are mixed evenly; add 10% distilled water of raw material quality and mix evenly, make a small test cake and keep it in a low-temperature furnace at 950°C for 30 minutes after drying, and then directly transfer to a 1450°C oven In the high-temperature furnace, keep warm for 40 minutes, cool down to 1300°C with the furnace, keep warm for 40 minutes, take it out, and cool to room temperature within 30 minutes. Under the condition of not adding fluorite, C 3 S and Coexisting CaO-SiO 2 -Al 2 o 3 -Fe 2 o 3 -SO 3 Multi-system cement clinker. The 3d compressive strength is 53.8MPa, the 7d compressive strength is 57.9MPa, and the 28d compressive strength is 73.6MPa, so the clinker has achieved the effect of high early strength and no shrinkage in the later stage.

Embodiment 2

[0021] Embodiment 2: 75% limestone, 7% sandstone, 2% fly ash, 10% low-grade bauxite (Al 2 o 3 The mass percentage is 42.2%), and 6% gypsum are mixed evenly; and the distilled water of 10% of the mass of the raw material is added and mixed evenly, and a small test cake is made, and after drying, it is kept in a low-temperature furnace at 950°C for 30min, and then directly transferred to 1450°C In a high-temperature furnace, keep it warm for 40 minutes, cool down to 1300°C with the furnace, keep it warm for 40 minutes, take it out and cool it to room temperature within 30 minutes, and get C under the condition of not adding fluorite. 3 S and Coexisting CaO-SiO 2 -Al 2 o 3 -Fe 2 o 3 -SO 3 Multi-system cement clinker. where C 3 The content of S is lower than example 1, content has increased. The 3d compressive strength is 52.3MPa, the 7d compressive strength is 58.5MPa, and the 28d compressive strength is 71.3MPa. The clinker has achieved the effect of high early stre...

Embodiment 3

[0022] Embodiment 3: with 80% limestone, 5% sandstone, 1% fly ash, 7% low-grade bauxite (Al 2 o 3 The mass percentage is 46.5%), and 7% gypsum are mixed evenly; and the distilled water of 10% of the mass of the raw material is added and mixed evenly, and a small test cake is made, and after drying, it is kept in a low-temperature furnace at 950°C for 30min, and then directly transferred to 1450°C In a high-temperature furnace, keep it warm for 40 minutes, cool down to 1300°C with the furnace, keep it warm for 40 minutes, take it out and cool it to room temperature within 30 minutes, and get C under the condition of not adding fluorite. 3 S and Coexisting CaO-SiO 2 -Al 2 o 3 -Fe 2 o 3 -SO3 Multi-system cement clinker. where C 3 The content of S is lower than example 2, content has increased. The 3d compressive strength is 55.7MPa, the 7d compressive strength is 60.2MPa, and the 28d compressive strength is 75.4MPa. The clinker has achieved the effect of high early st...

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Abstract

The invention relates to a method for preparing sulfoaluminate cement clinker by using a five-component mineral phase system. The alite-sulphoaluminate cement clinker is prepared by using a CaO-SiO2-Al2O3-Fe2O3-SO3 multicomponent system under the condition of not adding fluorite. The method comprises the following steps: (1) achieving the conditions that the basicity factor [(CaO+MgO) / (SiO2+Al2O3)] is 1.42 and the aluminum and sulfur ratio Al2O3 / SO3 is 1.73; (2) uniformly mixing and tabletting 75-80% of limestones, 5-7% of sandstones, 1-2% of coal ash, 6-10% of low-grade bauxite and 5-8% of gypsum, putting in a high-temperature furnace and sintering; and (3) insulating at 950 DEG C in a low-temperature furnace for 30 minutes, directly transferring to a high-temperature furnace at 1450 DEG C, insulating for 40 minutes, cooling along with the furnace to 1300 DEG C, insulating for 40 minutes, and cooling to room temperature after taking for 30 minutes to room temperature so as to obtain the CaO-SiO2-Al2O3-Fe2O3-SO3 multicomponent system cement clinker with coexisting C3S and C4A3S. The cement clinker has the advantages of high early strength and no shrinkage of long-term strength.

Description

field of invention [0001] The invention relates to a method utilizing CaO-SiO 2 -Al 2 o 3 -Fe 2 o 3 -SO 3 The preparation method of Alite-sulfoaluminate cement clinker fired by multi-component system. Background technique [0002] The cement industry is an energy- and resource-intensive industry, and it is the demand for ore, CO 2 As one of the key industries with large emissions, with the increasingly prominent environmental problems, my country attaches great importance to energy conservation and emission reduction, and reducing energy consumption and carbon dioxide emissions in the cement production process is of great significance for energy conservation and emission reduction. Emission reduction is mainly reflected in the reduction of CaCO 3 Consumption, energy saving mainly refers to reducing clinker calcination temperature, reducing ore consumption, and using industrial waste residue to replace natural resources. On the premise of ensuring energy saving and em...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36
CPCY02P40/121
Inventor 王亚丽王瑞蕴崔素萍王楠刘玲玲刘鹏飞杨松格王慢丽肖庆丰
Owner BEIJING UNIV OF TECH
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