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Magnesium phosphate cement

A technology of magnesium phosphate cement and dihydrogen phosphate, applied in the field of building materials, can solve the problems such as the inability to use it to prepare magnesium phosphate cement with setting time, the setting time of magnesium phosphate cement is difficult to control, the expansion and pulverization of magnesium phosphate cement, and the like. Conducive to the effect of volume stability, high hardness and enhanced compaction

Active Publication Date: 2018-07-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When dolomite is calcined at low temperature, the calcined products are MgO and CaCO 3 mixture, the activity of MgO in this mixture is very high, and it cannot be used to formulate magnesium phosphate cement with controllable setting time
The product of dolomite calcined at high temperature is usually a mixture of MgO and CaO, and the content of CaO in the mixture is relatively high. Due to the high activity of CaO, it will quickly react with phosphate to form amorphous calcium phosphate, which also makes the setting time of magnesium phosphate cement Difficult to control, when calcined dolomite with high MgO content, the magnesium phosphate cement prepared by the powder also has a certain strength, but the residual free CaO can easily lead to the later expansion and pulverization of magnesium phosphate cement products

Method used

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Effect test

Embodiment 1

[0027] The preparation method for the calcined dolomite powder that is used to prepare magnesium phosphate cement in the present embodiment may further comprise the steps:

[0028] (1) Dolomite is crushed to below 1mm with a crusher;

[0029] (2) Mix the silica powder and the broken dolomite evenly in a mass ratio of 0.5:1, and the SiO in the silica powder 2 The content is 95%;

[0030] (3) Calcining the above mixture at 1200°C for 1.5h, taking it out and cooling it naturally;

[0031] (4) Grinding the cooled calcined product through a sieve with an aperture of 75 μm to obtain the calcined dolomite powder.

Embodiment 2

[0033] The preparation method for the calcined dolomite powder that is used to prepare magnesium phosphate cement in the present embodiment may further comprise the steps:

[0034] (1) Dolomite is crushed to below 1mm with a crusher;

[0035] (2) Mix silica fume and broken dolomite evenly in a mass ratio of 2:1, and SiO in silica fume 2 The content is 85%;

[0036] (3) Calcining the above mixture at 1300°C for 3h, taking it out and cooling it naturally;

[0037] (4) Grinding the cooled calcined product through a sieve with an aperture of 75 μm to obtain the calcined dolomite powder.

Embodiment 3

[0039] The preparation method for the calcined dolomite powder that is used to prepare magnesium phosphate cement in the present embodiment may further comprise the steps:

[0040] (1) Dolomite is crushed to below 1mm with a crusher;

[0041] (2) Mix silica fume and broken dolomite evenly in a mass ratio of 1:1, and SiO in silica fume 2 The content is 85%;

[0042] (3) Calcining the above mixture at 1600°C for 4h, taking it out and cooling it naturally;

[0043] (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 magnesium phosphate cement, which is prepared from the following ingredients in parts by mass: 45-75 parts of magnesium oxide mixture, 15-50 parts of dihydric phosphate and 2-10 parts of retarder, wherein the magnesium oxide mixture comprises calcined dolomite dust. A preparation method of the calcined dolomite dust comprises the following steps: after smashed dolomite and silicon-containing ingredients are evenly mixed, calcining at the temperature of 1100-1800DEG C; and then, grinding a calcined product to obtain the calcined dolomite dust. Compared with traditionalmagnesium phosphate cement, the magnesium phosphate cement prepared by the method has the advantages that performance is similar and color is white, meanwhile, the selection range of a magnesium oxide raw material in the magnesium phosphate cement is enlarged, the cost of the magnesium phosphate cement is obviously lowered, and therefore, the magnesium phosphate cement has a good market prospect.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to magnesium phosphate cement. Background technique [0002] Magnesium phosphate cement has excellent properties such as early strength and quick hardening, high bond strength and good volume stability. It has been well applied in the fields of rapid repair and reinforcement of concrete structures. Show broad application prospects. [0003] Magnesium phosphate cement is prepared by reburning magnesium oxide, phosphate and retarder in a certain proportion. Among them, the proportion of dead-burned magnesia in magnesium phosphate cement can reach 50-80%. It is mainly obtained from magnesite after being calcined at a high temperature above 1600 ℃ and ground. Its quality has a considerable influence on the performance of magnesium phosphate cement. important influence. At present, the proven magnesite mining areas in my country are mainly distributed in Liaoning, Shandong and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
CPCC04B12/027
Inventor 钱觉时余金城唐江昱秦继辉岳燕飞范英儒尤超
Owner CHONGQING UNIV
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