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Belite cement and preparation method thereof

A belite and cement technology, used in cement production and other directions, can solve the problems of increased water absorption of concrete, sand on the surface of concrete, and high maintenance requirements, and achieve the effects of saving resources and energy, enhancing early strength, and enhancing hydration activity.

Active Publication Date: 2015-07-22
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since calcium sulfoaluminate exerts its full strength in the early stage, the strength hardly increases or even tends to shrink in the later stage, and calcium sulfoaluminate cement has high maintenance requirements, and a little carelessness can easily cause sanding on the concrete surface , so as to increase the water absorption of concrete and reduce the impermeability and durability of concrete
In addition, high-grade aluminum raw materials are needed in the preparation process of sulphoaluminate cement. The lack of high-quality aluminum raw materials and cost problems are also important problems restricting the wide application of sulphoaluminate cement.

Method used

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  • Belite cement and preparation method thereof
  • Belite cement and preparation method thereof
  • Belite cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Limestone, clay, aluminum ore waste rock and desulfurized gypsum were used as raw materials (see Table 1 for chemical composition). According to the rate value and mineral composition of the cement clinker designed in Table 2, the chemical composition of the clinker is calculated, and then the batching method is used for batching. The result of the batching is in parts by weight, 73.5 parts of limestone, 18.5 parts of clay, aluminum 6 parts of mine waste rock, 2 parts of desulfurization gypsum. Put these raw materials together into an experimental ball mill and grind until no more than 10% of the raw meal powder is sieved through an 80 μm square hole sieve. Add a small amount of water to the raw meal powder and stir it evenly, then press it into a raw meal cake. After drying, preheat it in a muffle furnace at 950°C for 30 minutes, and then move it into a high-temperature electric furnace at 1380°C for calcination for 60 minutes. After the calcination is finished, take ...

Embodiment 2

[0056] Limestone, clay, aluminum ore waste rock and desulfurized gypsum were used as raw materials (see Table 1 for chemical composition). Calculate the chemical composition of the clinker according to the rate value and mineral composition of the cement clinker designed in Table 4, and then use the trial mix method to batch the ingredients. The results of the ingredients are in parts by weight: 71 parts of limestone, 18 parts of clay, aluminum 8 parts of mine waste rock, 2 parts of desulfurization gypsum. These raw materials are put into an experimental ball mill and ground until 8% to 10% of the raw meal powder is sieved through an 80 μm square hole sieve. Add a small amount of water to the raw meal powder and stir evenly, then press it into a raw meal cake. After drying, preheat it in a muffle furnace at 950°C for 30 minutes, and then move it into a high-temperature electric furnace at 1360°C for calcination for 60 minutes. After the calcination is finished, take it out an...

Embodiment 3

[0063] Limestone, quartz sand, fly ash, steel slag and desulfurized gypsum were used as raw materials (see Table 6 for chemical composition). Calculate the chemical composition of the clinker according to the rate value and the mineral composition of the cement clinker designed in Table 7, and then use the trial mix method to batch the ingredients. The results of the ingredients are in parts by weight, 74.5 parts of limestone, 7 parts of quartz sand, 8 parts of fly ash, 8.5 parts of steel slag, and 2 parts of desulfurized gypsum. These raw materials are put into a raw meal mill and ground until no more than 15% of the raw meal powder is sieved through an 80 μm square hole sieve. The raw meal powder is fed into the preheater through the bucket elevator, and enters the calciner after five-stage preheating, and then enters the rotary kiln for calcination. The decomposition rate of the raw meal in the kiln is about 96%. The raw material is calcined in a rotary kiln for 30-40 minu...

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Abstract

The invention discloses belite cement and a preparation method thereof. Belite cement clinker comprises mineral components in percentage by weight as follows: 40%-70% of dicalcium silicate, 10%-40% of tricalcium silicate, 6%-15% of tetra calcium aluminoferrite, 1%-10% of anhydrous calcium sulphoaluminate, 0%-8% of tricalcium aluminate and 0%-2% of calcium sulfate. A small number of anhydrous calcium sulphoaluminate minerals are introduced into the belite cement clinker, and on the basis that advantages of low calcium, low energy consumption, low requirements for raw material taste and the like of belite cement are not changed, the early strength of the belite cement is substantially improved and approaches that of ordinary cement; and the belite cement has a remarkable effect of resource and energy saving with utilization of low-grade limestone and industrial residue resources.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to Belite cement and a preparation method thereof. Background technique [0002] Traditional Portland cement is composed of four major minerals, namely tricalcium silicate (3CaO SiO 2 , abbreviated as C 3 S, also known as Alite), dicalcium silicate (2CaO·SiO 2 , abbreviated as C 2 S, also known as Belite), tricalcium aluminate (3CaO·Al 2 o 3 , abbreviated as C 3 A) and tetracalcium aluminoferrite (4CaO·Al 2 o 3 · Fe 2 o 3 , abbreviated as C 4 AF, also known as Cai Lite), among which tricalcium silicate is the most important constituent mineral, with a content of 50-70%. Traditional portland cement has high early strength and large hydration heat release. It needs high calcium ingredients and high firing temperature (1450-1500 ℃) during preparation, and CO 2 High emissions increase energy consumption and environmental pollution. with C 2 Belite cement with S ...

Claims

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Application Information

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IPC IPC(8): C04B11/30C04B7/32
CPCY02P40/10
Inventor 王敏汪智勇文寨军王晶
Owner CHINA BUILDING MATERIALS ACAD
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