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Alite crystal modulation process in metasilicate cement clinker

A Portland cement and clinker technology, applied in clinker production, cement production and other directions, can solve the problems of low cement quality and affect the life of concrete projects, and achieve the effect of improving performance and simple and feasible process

Active Publication Date: 2010-06-02
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country is a big country in cement production, it is not a powerful country. The overall quality of cement is not high, which affects the life of concrete projects in our country. Therefore, the performance of cement must be improved.

Method used

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  • Alite crystal modulation process in metasilicate cement clinker
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  • Alite crystal modulation process in metasilicate cement clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Heat up the prepared Portland cement raw meal to 1450° C. for calcination for 1 hour; cool;

[0023] (2) Heat up at a rate of 5°C per minute, keep warm for 30 minutes when the temperature rises to 1450°C, and then cool naturally;

[0024] (3) The cooled clinker starts to heat up at 800°C, and heats up at a rate of 10°C per minute. When the temperature rises to 1100°C, it is kept for 60 minutes, and then naturally cooled;

[0025] (4) Grind the cooled clinker into a specific surface area of ​​340m through a ball mill 2 / kg of powder; the XRD patterns of Alite minerals in clinker and the XRD patterns of Alite minerals in the clinker of Xuzhou Huaihai Cement Plant without heat treatment are shown in Figure 1 and Figure 2; as can be seen from the figure, Huaihai cement After the Portland cement clinker in the factory was calcined at 1100°C for 60 minutes and heat-treated, the Alite crystal form changed from M3 to M1.

[0026] (5) Weigh 96g of the final product clinker...

Embodiment 2

[0030] (1) Heat up the prepared Portland cement raw meal to 1480° C. for calcination for 0.5 hours; cool;

[0031] (2) Heat up at a rate of 10°C per minute, keep warm for 60 minutes when the temperature rises to 1500°C, and then cool naturally;

[0032] (3) The cooled clinker starts to heat up at 700°C, and heats up at a rate of 15°C per minute. When the temperature rises to 1000°C, it is kept for 90 minutes, and then naturally cooled; the specific surface area is 350m after being ground by a ball mill. 2 / kg of powder;

[0033] (4) Weigh 96g of the final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29) to stir and shape, the size of the test piece is 20×20×20mm, measure the 3d and 28d compression resistance strength. The test block is first cured in a curing box with a relative humidity of 90% and a temperature of 20±2°C for 24 hours, and then the demoulded test block is placed in a water curing box at 20±1°C for curing. The stre...

Embodiment 3

[0037] (1) Heat up the prepared Portland cement raw meal to 1450° C. for 1 hour for calcination; cool,

[0038] (2) Heat up at a rate of 5°C per minute, keep warm for 60 minutes when the temperature rises to 1450°C, then enter the cooling machine, and cool down at a rate of 55°C per minute;

[0039] (3) When the temperature is cooled to 1000°C, keep it warm for 60 minutes;

[0040] (4) Then cool naturally; the cooled clinker is ground into a specific surface area of ​​360m through a ball mill 2 / kg of powder;

[0041] (5) Weigh 96g of the final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29) to stir and shape, the size of the test piece is 20×20×20mm, measure the 3d and 28d compression resistance strength. The test block is first cured in a curing box with a relative humidity of 90% and a temperature of 20±2°C for 24 hours, and then the demoulded test block is placed in a water curing box at 20±1°C for curing. The strength compa...

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Abstract

The invention relates to an alite crystal modulation process in a metasilicate cement clinker. The alite crystal is changed in the clinker through carrying out thermal treatment on the metasilicate cement clinker so as to achieve the purpose of improving the performance of the metasilicate cement clinker. Therefore, the process is simple and feasible.

Description

technical field [0001] The invention relates to a process for controlling the alite crystal form in Portland cement clinker, in particular to a method for improving the performance of Portland cement clinker. Background technique [0002] my country's cement industry has developed rapidly. In 2008, my country's cement output was nearly 1.45 billion tons, accounting for 50% of the world's total cement output, ranking first in the world for 24 consecutive years. As my country's economy is in a period of rapid development, it is predicted that my country's cement output will continue to grow at a rate of 10%. Although my country is a big country in cement production, it is not a powerful country. The overall quality of cement is not high, which affects the life of concrete projects in our country. Therefore, the performance of cement must be improved. Portland cement is mainly composed of Portland cement clinker, gypsum and admixtures. To improve the performance of Portland c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43
CPCC04B7/43C04B7/02C04B7/48Y02P40/121
Inventor 沈晓冬马素花黎学润陈琳周伟强邓松
Owner NANJING TECH UNIV
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