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Micro-expansive moderate-heat Portland cement and production method thereof

A technology of Portland cement and production method, applied in the field of building materials, can solve problems such as low expansion performance, and achieve the effects of improving crack resistance, high clinker quality and high strength

Inactive Publication Date: 2013-03-20
GUANGXI YUFENG CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report on the formula and production method of this product, which fills the blank of using "wet grinding and dry burning" to produce medium heat portland cement with low expansion performance

Method used

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  • Micro-expansive moderate-heat Portland cement and production method thereof
  • Micro-expansive moderate-heat Portland cement and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Raw material preparation: add 75% limestone, 10% sandstone, 10% sulfuric acid slag, and 5% dolomite that meet the quality requirements, add water, grind, then filter to obtain a slurry with a water content of 33%, and stir evenly;

[0041] 2. Slurry dehydration: After the slurry is dehydrated by a vacuum suction filter, a filter cake with a water content of 20% is formed;

[0042] 3. Filter cake drying and crushing: the filter cake is fed into the drying crusher through the box feeder, and the waste gas (600°C) from the kiln tail is used to dry it into raw meal powder with a water content of 3%. The drying exhaust gas is brought into the cyclone separator for material gas separation, and the separated raw meal powder enters the cyclone preheater and decomposition furnace of the firing system, and the exhaust gas (about 150°C) exiting the cyclone separator is sent by the kiln tail fan. After entering the electrostatic precipitator for purification, it is discharged in...

Embodiment 2

[0046] 1. Raw material preparation: add 65% limestone, 20% sandstone, 12% sulfuric acid slag, and 3% dolomite that meet the quality requirements, add water, grind, then filter to obtain a slurry with a water content of 36%, and stir evenly;

[0047] 2. Slurry dehydration: After the slurry is dehydrated by a vacuum suction filter, a filter cake with a water content of 18% is formed;

[0048] 3. Filter cake drying and crushing: the filter cake is fed into the drying crusher through the box feeder, and the waste gas (600°C) from the kiln tail is used to dry it into raw meal powder with a water content of 1%. The drying exhaust gas is brought into the cyclone separator for material gas separation, and the separated raw meal powder enters the cyclone preheater and decomposition furnace of the firing system, and the exhaust gas (about 150°C) exiting the cyclone separator is sent by the kiln tail fan. After entering the electrostatic precipitator for purification, it is discharged in...

Embodiment 3

[0052] 1. Raw material preparation: Add 45% of marl, 32% of chalk, 8% of silica, 7% of sulfuric acid slag, and 8% of magnesite that meet the quality requirements, add water, grind, and then filter to obtain a water content of 35%. slurry, stir evenly;

[0053] 2. Slurry dehydration: After the slurry is dehydrated by a vacuum suction filter, a filter cake with a water content of 17% is formed;

[0054] 3. Filter cake drying and crushing: the filter cake is fed into the drying crusher through the box feeder, and the waste gas (600°C) from the kiln tail is used to dry it into raw meal powder with a water content of 2%. The drying exhaust gas is brought into the cyclone separator for material gas separation, and the separated raw meal powder enters the cyclone preheater and decomposition furnace of the firing system, and the exhaust gas (about 150°C) exiting the cyclone separator is sent by the kiln tail fan. After entering the electrostatic precipitator for purification, it is d...

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Abstract

The invention discloses a micro-expansive moderate-heat Portland cement and a production method thereof. The cement contains micro-expansive moderate-heat Portland cement clinker and gypsum in a weight ratio of 92:8-98:2, and also comprises grinding aid which accounts for 0-0.1 wt% of the sum of micro-expansive moderate-heat Portland cement clinker and gypsum. The raw meal of the micro-expansive moderate-heat Portland cement clinker is prepared from the following raw materials in percentage by weight: 65-80% of calcium raw material, 5-20% of silicon correction raw material, 5-15% of iron correction raw material and 3-10% of magnesium correction raw material. The micro-expansive moderate-heat Portland cement clinker is prepared by the following steps: grinding the raw meal, dehydrating the slurry, drying and crushing the filter cake, and firing to obtain the clinker. By adopting the low-aluminum high-iron high-magnesium low-saturation-ratio formula, the invention effectively controls the hydration heat of cement, displays the micro-expansive property, and can compensate the volume shrinkage in the concrete cooling process, thereby reducing or avoiding cracks.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a medium-heat Portland cement and a production method thereof. Background technique [0002] Medium-heat cement is mainly suitable for water conservancy projects and large-volume concrete projects that require low heat of hydration. If it is used in the construction of a dam, since the dam is a large-volume concrete, the concrete must be prevented from cracking while ensuring the strength of the cement. Strictly control the heat of hydration of cement. In water conservancy projects, concrete often reaches one million cubic meters, so there are high requirements for low temperature rise, crack prevention and high durability of concrete. Therefore, for more than half a century, how to improve the crack resistance of dam concrete and reduce or avoid the generation of cracks has always been a problem of great concern to researchers engaged in dam design, construction and te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/04C04B7/36C04B7/38
CPCY02P40/121
Inventor 李宏柳陈昌林沈文华卢赤宁罗海波潘国文张芳
Owner GUANGXI YUFENG CEMENT
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