Secondary synthesis method of calcium sulfoaluminate minerals in metasilicate cement clinker

A technology of calcium sulfoaluminate minerals and Portland cement, which is applied in the field of secondary synthesis of calcium sulfoaluminate minerals in Portland cement clinker, can solve the problems such as failure to reflect the early strength and other properties of Portland cement. , to achieve the effect of improving early and long-term performance, increasing content, and increasing the amount of incorporation

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

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Problems solved by technology

[0004] However, at present, most of the cement enterprises in my country adopt the new type of dry calcination, the calcination temperature is about 1450 ℃, most of the cement clinker formed decomposed, so the cement clinker contains only a small amount of minerals, resulting in The early strength and other properties of mineral Portland cement have not been reflected, so it contains The preparation technology of mineral Portland cement clinker is still not in large-scale industrial production in my country, and most cement enterprises still produce traditional Portland cement clinker in the precalcining kiln

Method used

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  • Secondary synthesis method of calcium sulfoaluminate minerals in metasilicate cement clinker
  • Secondary synthesis method of calcium sulfoaluminate minerals in metasilicate cement clinker
  • Secondary synthesis method of calcium sulfoaluminate minerals in metasilicate cement clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.30kg of gypsum (SO in gypsum) to the prepared 5kg of Portland cement raw meal (see Table 1 for the chemical analysis of raw meal) 3 The mass percentage is 32.90%), so that the SO in the raw meal 3 The mass percentage content is 1.86%;

[0023] (1) Raise the prepared raw meal to 1480℃, calcinate for half an hour, and cool; then increase the temperature at a rate of 5℃ per minute, keep it for 30 minutes when it rises to 1450℃, and then cool;

[0024] (2) Increase the temperature of the cooled clinker at a rate of 10°C per minute, hold it for 60 minutes when the temperature rises to 1200°C, and then cool it;

[0025] (3) Grind the cooled clinker with a ball mill to a specific surface area of ​​350m 2 / kg of powder; according to the measurement method disclosed in the patent (200710302594.1) applied by the inventor, the clinker (not heat-treated) in the Xuzhou Huaihai Cement Plant was measured The mass percentage content of the clinker is 0.5%. The mass percentage of 4.8%; ...

Embodiment 2

[0032] (1) Add 0.28kg of gypsum (SO in gypsum) to 5kg of Portland cement raw meal (see Table 1 for the chemical analysis of raw meal). 3 The content is 32.90%), so that the SO in the raw meal 3 The content is 1.74%;

[0033] (2) Raise the prepared raw meal to 1450°C and calcinate for 1 hour, cool it, and then increase the temperature at 10°C per minute, keep it at 1400°C for 50 minutes, and then cool it;

[0034] (3) Increase the temperature of the cooled clinker at a rate of 15°C per minute, hold it for 90 minutes when the temperature rises to 1250°C, and then cool it;

[0035] (4) Grind the cooled clinker with a ball mill to a specific surface area of ​​360m 2 / kg of powder;

[0036] (5) Weigh 96g of final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29), stir and shape, the size of the test block is 20×20×20mm, and measure 1d, 3d and 28d Compressive strength. The test block is cured for 24 hours in a curing box with a relative humidity o...

Embodiment 3

[0040] (1) Add 0.3kg of gypsum (SO in gypsum) to 5kg of Portland cement raw meal (see Table 1 for the chemical analysis of raw meal) 3 The content is 32.90%), so that the SO in the raw meal 3 The content is 1.86%;

[0041] (2) Raise the prepared raw meal to 1450°C and calcinate for 1 hour, cool it, then raise it to 1450°C at a rate of 5°C per minute, keep it for 30 minutes, and then enter the cooler to cool down at a rate of 55°C per minute;

[0042] (3) When the temperature is cooled to 1250°C, keep it warm for 60 minutes, then cool down;

[0043] (4) Grind the cooled clinker with a ball mill to a specific surface area of ​​340m 2 / kg of powder;

[0044] (5) Weigh 96g of final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29), stir and shape, the size of the test block is 20×20×20mm, and measure 1d, 3d and 28d Compressive strength. The test block is cured for 24 hours in a curing box with a relative humidity of 90% and a temperature of 20±2...

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Abstract

The invention relates to a secondary synthesis method of calcium sulfoaluminate minerals in a metasilicate cement clinker, comprising the following steps of: mixing a plaster in a metasilicate cement raw material and calcining; and carrying out thermal treatment on the metasilicate cement clinker containing the calcium sulfoaluminate minerals to enable the decomposed calcium sulfoaluminate minerals in the clinker is re-formed at a high-temperature state. Therefore, the invention improves the content of the calcium sulfoaluminate minerals in the clinker, sufficiently develops the superiority of the calcium sulfoaluminate minerals in the cement clinker, improves the early and long-term perofmrance of the cement clinker and increases the mixture quantity of a mixed material in the cement.

Description

Technical field [0001] The invention relates to a preparation process of high cementitious cement clinker, in particular to a method for secondary synthesis of calcium sulfoaluminate mineral in Portland cement clinker. Background technique [0002] Minerals in Portland cement can increase the early strength of cement, and at the same time stimulate the activity of the admixture, increase the use rate of the admixture in Portland cement, so it forms in the Portland cement clinker in industrial production Minerals are of great significance. [0003] With The key scientific problem in the preparation of mineral Portland cement clinker is the The coexistence of the two and Alit, Minerals decompose in a large amount at 1350℃, while Alite in the clinker starts to form in large quantities at 1450℃, so from a thermodynamic point of view And Alit cannot coexist in the same system. Therefore, the current The preparation method of mineral Portland cement clinker is mainly prepared by mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43C04B7/42
CPCC04B7/04C04B7/323
Inventor 沈晓冬马素花邓松陈琳黎学润周伟强
Owner NANJING TECH UNIV
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