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Method for increasing content of periclase in high-magnesium moderate-heat cement clinker

A technology of cement clinker and high magnesium, which is applied in cement production and other directions, can solve the problems of unsatisfactory crack resistance of cement and limitation of free magnesium oxide content.

Active Publication Date: 2016-03-30
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] my country's national standard stipulates that the content of magnesia in medium-heat cement is limited to 6.0%, but in the prior art, due to the high proportion of solid-dissolved magnesia in cement, the content of free magnesia is limited, resulting in the existing Crack resistance of technical cement is not sufficient for its application in mass concrete

Method used

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  • Method for increasing content of periclase in high-magnesium moderate-heat cement clinker
  • Method for increasing content of periclase in high-magnesium moderate-heat cement clinker

Examples

Experimental program
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Effect test

Embodiment 1

[0032] According to the mineral composition of the cement clinker designed in Example 1 in Table 2, the chemical composition of the clinker is calculated, and the batching is carried out by the trial compounding method. The result of the batching is calculated in parts by weight, taking 85% of limestone and 2% of vanadium-titanium slag. The raw materials are 5% silica, 1% iron tailings and 10% magnesite. Put the above-mentioned raw materials together in an experimental ball mill and grind to a 80 μm square hole sieve with no more than 10% raw meal powder. The raw meal powder is mixed with a small amount of water and mixed uniformly and then pressed into a raw meal cake. After drying, it is preheated in a muffle furnace at 950°C for 30 minutes, and then moved into a high-temperature electric furnace at 1420°C for 60 minutes. After the calcination is finished, take it out and put it in the air and cool it to room temperature with an electric fan to obtain clinker.

[0033] Compare...

Embodiment 2

[0035] According to the mineral composition of the cement clinker designed in Example 1 in Table 2, the chemical composition of the clinker is calculated, and the batching is carried out by the trial compounding method. The result of the batching is in parts by weight, taking 60% limestone and 10% vanadium-titanium slag. 10% silica, 5% iron tailings, and 20% magnesite are raw materials. Put the above-mentioned raw materials together in an experimental ball mill and grind to a 75 μm square hole sieve with no more than 20% raw meal powder. Add a small amount of water to the raw meal powder, stir it evenly, and press it into a raw meal cake. After drying, it is preheated in a muffle furnace at 850°C for 20 minutes, and then moved into a high-temperature electric furnace at 1300°C for 20 minutes. After the calcination is finished, take it out and put it in the air and cool it to room temperature with an electric fan to obtain clinker.

[0036] Compared with using limestone, aluminum...

Embodiment 3

[0038] According to the mineral composition of the cement clinker designed in Example 1 in Table 2, the chemical composition of the clinker is calculated, and the batching is carried out by the trial compounding method. The result of the batching is in parts by weight, taking 70% limestone and 8% vanadium-titanium slag. The raw materials are 8% silica, 3% iron tailings and 15% magnesite. Put the above-mentioned raw materials together in an experimental ball mill and grind to a 85 μm square hole sieve with no more than 10% raw meal powder. Add a small amount of water to the raw meal powder and mix it evenly and press it into a raw meal cake. After drying, it is preheated in a muffle furnace at 1000°C for 50 minutes, and then moved to a high temperature electric furnace at 1500°C for 40 minutes. After the calcination is completed, take it out and put it in the air and cool it to room temperature with an electric fan to obtain clinker.

[0039] Compared with using limestone, alumin...

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Abstract

The invention relates to a method for increasing the content of periclase in a high-magnesium moderate-heat cement clinker. The method comprises the following steps: grinding limestone, vanadium-titanium slag, silica, iron tailings and magnesite together to obtain a cement raw material powder; preheating and then calcining the cement raw material powder to obtain a cement clinker; and cooling the cement clinker. The cement clinker comprises the following components in percentage by weight: 48-53% of tricalcium silicate, 20-28% of dicalcium silicate, 1-3% of tricalcium aluminate, 15-18% of tetracalcium aluminoferrite and 3-6% of magnesium oxide. According to the method provided by the invention, metallic elements of manganese, vanadium, titanium and the like in the vanadium-titanium slag are used for replacing magnesium to carry out mineral solid melting and reduce the relative content of solid melting magnesium oxide in clinker liquid, thereby improving the content of free magnesium oxide in the high-magnesium moderate-heat cement clinker.

Description

Technical field [0001] The invention relates to a cement preparation process, in particular to a method for increasing the content of periclase in high-magnesium intermediate heat cement clinker. Background technique [0002] Magnesium oxide (MgO) is a common secondary component in the mineral phase system of cement clinker. It mainly comes from limestone raw materials in the cement production process, mainly including dolomite, magnesium carbonate, magnesite, iron dolomite, etc. [0003] According to research at home and abroad, there are two main ways of magnesia in clinker: one is magnesia solid-melted in cement clinker minerals, that is, solid solution magnesia; the other is free magnesia, that is, Magnesite. Among these two forms of magnesium oxide, only periclase can participate in the hydration reaction, and periclase will generate Mg(OH) during hydration. 2 At the same time the volume expands by 117%. Using the delayed micro-expansion characteristics of periclase itself, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147C04B7/36
CPCC04B7/147C04B7/36Y02P40/10
Inventor 姚燕王敏张坤悦
Owner CHINA BUILDING MATERIALS ACAD
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