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Preparation method of magnesium oxide for concrete

A magnesia and concrete technology, which is applied in the field of magnesia preparation for concrete, can solve problems such as difficulty in guaranteeing activity, difficult control of concrete shrinkage effect, uneven firing weight of concrete magnesia, etc., and achieves low cost and stable weight , Great social and economic benefits

Active Publication Date: 2019-07-19
武汉三源特种建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the weight of concrete magnesia currently used in the market is not uniform, the degree of activity is difficult to guarantee, and the effect on concrete shrinkage is difficult to control.

Method used

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  • Preparation method of magnesium oxide for concrete
  • Preparation method of magnesium oxide for concrete
  • Preparation method of magnesium oxide for concrete

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0061] In this preparation example, the magnesium oxide raw material (by weight) for concrete includes 100% by weight of commercially available magnesite.

[0062] The particle size range of this preparation example is 10-30mm. The particle diameter of the raw material is the median value of the main particles in the particle diameter range, and basically all the particle diameters are within the range (the same below).

Embodiment 1-9

[0064] The calcination temperatures and calcination conditions for Examples 1-9 are listed in Table 1 below.

[0065] During the calcination process, a hollow rotary kiln is used According to working example 1, the raw material is calcined according to the conditions listed in Examples 1-9, and the heat value is 9000-9500Kcal / Nm 3 Class I natural gas is used as fuel. After calcination, the calcined material is ground to a fineness (80 μm sieve) of less than 5%.

[0066] Table 1

[0067]

[0068] *Note: During the calcination process, the calcination temperature is mainly controlled around the median value of the temperature range of the colorimetric pyrometer, and fluctuates up and down within this temperature range, and does not exceed the boundary value (the same below).

[0069] It can be seen from the implementation effect that when the particle size of raw materials is within the range of 10-30mm, the dust in the kiln is generally relatively high, which affects the ...

preparation example 2

[0071] In this preparation example, the magnesium oxide raw material (by weight) for concrete includes 100% of commercially available magnesite.

[0072] The particle size range of this preparation example is 30-60mm.

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Abstract

The invention relates to a method for preparing magnesium oxide for concrete. The method uses magnesium-containing mineral sources such as magnesite, dolomite, etc. as raw materials, and prepares magnesium oxide for concrete by controlling calcination and grinding. The invention realizes the industrialized and stable production of rotary equipment of magnesium oxide for concrete, and by controlling the calcination conditions, magnesium oxide for concrete with different activity ranges is prepared, which significantly improves the uniformity and stability of the weight of magnesium oxide for concrete production. Improved expansion when used in concrete, capable of controlling the expansion of concrete or buildings.

Description

technical field [0001] The invention relates to the field of building material admixtures, in particular to a preparation method of magnesium oxide for concrete. Background technique [0002] Concrete shrinks in volume due to dry climate and climate change during use, resulting in cracking behavior, which is a common problem in structures and seriously affects the durability of concrete structures. Cracking of concrete structures caused by temperature shrinkage is common in modern high-performance concrete. [0003] From the material point of view, concrete expansion agent, shrinkage reducer, steel fiber and synthetic organic fiber are all effective measures to reduce or eliminate cracks. But in terms of material price and construction convenience, expansion agent has more advantages. Cracks in buildings are mainly caused by shrinkage of concrete. Providing concrete expansion agent to compensate for the shrinkage of concrete over time is the most common technical means to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10C04B22/06
CPCC04B2/102C04B22/066
Inventor 王海龙侯维红杨进波凡涛涛
Owner 武汉三源特种建材有限责任公司
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