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A kind of preparation method of calcined dolomite powder

The technology of dolomite powder and dolomite, which is applied in the field of building materials, can solve the problems of high energy consumption, complex production process, low efficiency, etc., and achieve the effects of low energy consumption, simple method and favorable volume stability.

Active Publication Date: 2021-01-15
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the current demand for magnesia raw materials for magnesia building materials and the above-mentioned shortcomings in the prior art of preparing magnesia materials from dolomite, the purpose of the present invention is to provide a method for preparing calcined dolomite powder, which solves the problem of using dolomite to prepare magnesia powder. The method of magnesium oxide has the problems of high energy consumption, low efficiency and complicated production process

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  • A kind of preparation method of calcined dolomite powder
  • A kind of preparation method of calcined dolomite powder

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Effect test

Embodiment 1

[0025] The preparation method of calcined dolomite powder in the present embodiment, comprises the following steps:

[0026] (1) Use a crusher to crush the dolomite to less than 1mm;

[0027] (2) Mix silica powder and crushed dolomite evenly at a mass ratio of 0.5:1, SiO in silica powder 2 The content is 95%;

[0028] (3) Calcinate the above mixture at 1150°C for 2 hours, take it out and cool it naturally;

[0029] (4) Grinding the cooled calcined product through a sieve with an aperture of 75 μm to obtain the calcined dolomite powder.

Embodiment 2

[0031] The preparation method of calcined dolomite powder in the present embodiment, comprises the following steps:

[0032] (1) Use a crusher to crush the dolomite to less than 1mm;

[0033] (2) Mix silica fume and broken dolomite evenly at a mass ratio of 1:1, SiO in silica fume 2 The content is 85%;

[0034] (3) Calcinate the above mixture at 1300°C for 3 hours, take it out and cool it naturally;

[0035] (4) Grinding the cooled calcined product through a sieve with an aperture of 75 μm to obtain the calcined dolomite powder.

Embodiment 3

[0037] The preparation method of calcined dolomite powder in the present embodiment, comprises the following steps:

[0038] (1) Use a crusher to crush the dolomite to less than 1mm;

[0039] (2) Mix diatomite and crushed dolomite evenly in a mass ratio of 2.5:1, SiO in diatomite 2 The content is 75%;

[0040] (3) Calcinate the above mixture at 1650°C for 1.5h, take it out and cool it naturally;

[0041] (4) Grinding the cooled calcined product through a sieve with an aperture of 58 μm to obtain the calcined dolomite powder.

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Abstract

The invention discloses a preparation method of calcined dolomite powder. The preparation method comprises the following steps: breaking dolomite into particles of 1mm or smaller, and uniformly mixinga silicon-containing component with the broken dolomite according to a mass ratio of (0.5 to 1) to (4 to 1); calcining the mixture at 800-1,800 DEG C for 15min to 4h; taking out the mixture and cooling naturally; grinding to 1-80mum to obtain the calcined dolomite powder. The prepared calcined dolomite powder can serve as a main raw material for preparing magnesium phosphate cement and magnesiumoxychloride cement, and also can serve as a concrete expansion agent. According to the preparation method disclosed by the invention, the calcined dolomite powder containing free MgO and containing noor little free CaO is obtained by using the abundant dolomite ore in the nature and by introducing the silicon-containing component and calcining, thereby widening the source of the magnesium oxide raw material in the products of magnesium building materials. Meanwhile, the preparation process is simple, the energy consumption is reduced during the production of the magnesium oxide raw material,the cost of the magnesium oxide raw material for the magnesium building material can be remarkably lowered, and thus the calcined dolomite powder has a good market prospect.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a preparation method of calcined dolomite powder. Background technique [0002] Magnesium oxide materials are widely used in chemical, pharmaceutical, food processing, metallurgy and construction industries and other fields. Magnesium oxide materials are mainly used as one of the main raw materials of magnesia cementitious materials in building materials. According to the calcination production process, they can be divided into light-burned magnesia and heavy-burned magnesia. In the building material industry, light-burned magnesia is mainly used in the production of magnesium oxychloride cement products. Light-burned magnesia and magnesium chloride aqueous solution can be formulated into magnesium oxychloride cement in a certain proportion, which has light weight, high strength, fireproof and heat insulation, With advantages of energy saving and environmental protection, it ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10
CPCC04B2/104
Inventor 钱觉时余金城秦继辉岳燕飞范英儒尤超唐江昱
Owner CHONGQING UNIV
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