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Silicate cement clinker containing anhydrous calcium sulphoaluminate minerals and production thereof

An anhydrous calcium sulfoaluminate and Portland cement technology, applied in cement production and other directions, can solve the problems of low strength, high cost, and low admixture content, and achieve good compatibility, good grindability, high intensity effect

Inactive Publication Date: 2006-02-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional production of general-purpose cement clinker is mainly calcined from limestone, clay, iron correction raw materials and a specified amount of coal powder. A certain proportion of mixed materials are mixed into the clinker and the general-purpose cement is obtained after grinding. Composition of four major minerals C 3 S, C 2 S, C 3 A.C 4 C in AF 3 A. Hydration hardening has high heat of hydration and large dry shrinkage changes, resulting in low early strength of this type of cement, small amount of mixed materials, and high cost.
There is also the production of sulfur-containing aluminate cement, but this cement is a special cement, not a general-purpose cement, and cannot be used in conventional construction projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: In the vertical kiln production line, mix 80kg of limestone, 10kg of clay, 4kg of gypsum, 1kg of fluorite, and 5kg of coal into a ball mill to grind into raw material, then add water to form balls into a vertical kiln, and calcinate at about 1300°C Mature material. Measured by chemical analysis method and X-ray diffraction quantitative method 3 S weight percentage accounts for 60%, C 4 A 3 The weight percentage of S is 4%, Fe 2 o 3 The weight percentage accounts for 2.5%.

Embodiment 2

[0010] Example 2: On the rotary kiln production line, mix 85kg of limestone, 6kg of clay, 7kg of gypsum, and 2kg of fluorite into a ball mill to grind into raw meal, and feed the raw meal into the rotary kiln to calcinate the clinker at about 1350°C. Measured by chemical analysis method and X-ray diffraction quantitative method 3 S weight percentage accounts for 55%, C 4 A 3 The weight percentage of S is 6%, Fe 2 o 3 The weight percentage accounts for 1.5%.

Embodiment 3

[0011] Example 3: On the shaft kiln production line, mix 75kg of limestone, 5kg of clay, 5kg of gypsum, 1kg of fluorite, and 15% of coal into a ball mill to grind raw materials, then add water to form balls and put them into the shaft kiln at about 1200°C Calcined clinker. Measured by chemical analysis method and X-ray diffraction quantitative method 3 S weight percentage accounts for 50%, C 4 A 3 The weight percentage of S is 5%, Fe 2 o 3 The weight percentage accounts for 0.5%.

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Abstract

A silicate cement clinker containing anhydrous calcium thioaluminate mineral is prepared from lime stone, clay and mineralizing agent through proportioning, grinding and calcining. It contains C3S, C2S and C4A3S. Its advantages are high strength and antiflex cracking rate, and high compatibility with powdered coal ash.

Description

Technical field: [0001] The invention relates to a cement clinker and a production method thereof, in particular to a Portland cement clinker containing anhydrous calcium sulfoaluminate mineral and a production method thereof. Background technique: [0002] The traditional production of general-purpose cement clinker is mainly calcined from limestone, clay, iron correction raw materials and a specified amount of coal powder. A certain proportion of mixed materials are mixed into the clinker and the general-purpose cement is obtained after grinding. Composition of four major minerals C 3 S, C 2 S, C 3 A.C 4 C in AF 3 A hydration hardening has high heat of hydration and large dry shrinkage changes, resulting in low early strength of this type of cement, small amount of mixed materials, and high cost. There is also the production of sulfur-containing aluminate cement, but this cement is a special cement, not a general-purpose cement, and cannot be used in conventional cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/00C04B7/345C04B7/38C04B7/43
CPCY02P40/10
Inventor 沈晓冬
Owner NANJING TECH UNIV
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