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Magnesium phosphate cement containing C4AF solid solution and preparation method

A technology of magnesium phosphate cement and solid solution, applied in the field of building materials, can solve the problems of staying, water resistance, etc.

Active Publication Date: 2022-01-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the nature of hydration products and the fact that a large amount of magnesia residues cannot participate in hydration in the later stage, water resistance is mostly at the stage of improvement but cannot be completely resolved.

Method used

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  • Magnesium phosphate cement containing C4AF solid solution and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a C 4 Magnesium phosphate cement of AF solid solution, the main components of which are by weight: C 4 40 parts of AF solid solution, 35 parts of MgO, 20 parts of ammonium dihydrogen phosphate, and 5 parts of borax; the preparation process mainly includes the following steps:

[0035] (1) C 4 AF solid solution precursor preparation, according to C 4 The stoichiometry of AF solid solution Weigh the calcareous components, aluminum-containing components and iron-containing minerals and mix and homogenize;

[0036] (2) Take the homogenized precursor in step (1), calcinate it at 1000~1500°C for 20min~3h, take it out and let it cool naturally.

[0037] (3) Take the sintered material after cooling in step (2), and perform grinding treatment, and the fineness is controlled below 75 μm.

[0038] (4) C will be obtained 4 AF solid solution was prepared with commercially available dead-burned MgO, phosphate, and borax according to the composition ratio of 40:35:20:5 to obtain ...

Embodiment 2

[0040] a C 4 Magnesium phosphate cement of AF solid solution, its main components are by weight: 35 parts C 4 AF solid solution, 40 parts of MgO, 17 parts of ammonium dihydrogen phosphate, 8 parts of borax; the preparation process mainly includes the following steps:

[0041] (1) C 4 Preparation of AF solid solution and MgO mixture precursor, according to C 4 For the ratio range of AF solid solution to magnesium oxide, weigh calcium and magnesium components, aluminum-containing components and iron-containing minerals and mix and homogenize.

[0042] (2) Take the homogenized precursor in step (1), calcinate it at 1000~1500°C for 20min~3h, take it out and cool it naturally to get C 4 AF solid solution-MgO mixture.

[0043] (3) Take the sintered product after rapid cooling in step (2), and perform grinding treatment, and the fineness is controlled below 75 μm.

[0044] (4) put C 4 The AF solid solution-MgO mixture was prepared with phosphate and borax according to the composi...

Embodiment 3

[0046] a C 4 The magnesium phosphate cement of AF solid solution, its main component is by weight: 42 parts C 4 AF solid solution, 30 parts of MgO, 20 parts of ammonium dihydrogen phosphate, 5 parts of borax, of which 3 parts of boron oxide are in synergy C 4 The AF solid solution-MgO mixture is introduced during the firing process, mainly including the following steps:

[0047] (1) C 4 Preparation of AF solid solution-MgO precursor according to C 4 AF:MgO:B 2 o 3 The ratio is 56:40:4, weigh dolomite, aluminum ash, iron oxide and boron oxide and mix and homogenize.

[0048] (2) Take the homogenized precursor in step (1), calcinate it at 1000~1500°C for 20min~3h, take it out and cool it naturally to get C 4 AF solid solution-MgO mixture.

[0049] (3) Take the sintered product after rapid cooling in step (2), and perform grinding treatment, and the fineness is controlled below 75 μm.

[0050] (4) put C 4 The AF solid solution-MgO mixture is prepared with phosphate and b...

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Abstract

The invention discloses magnesium phosphate cement containing a C4AF solid solution and a preparation method thereof. The magnesium phosphate cement is prepared from the following raw materials in parts by weight: 30-40 parts of the C4AF solid solution, 40-50 parts of MgO, 15-20 parts of phosphate, 0-5 parts of boric oxide or 5-10 parts of borax. The composition range of the final mineral phase of the cement is determined, corresponding minerals can be directly combined for preparation, the C4AF solid solution and the intermediate component of MgO can be prepared by adopting a high-temperature mode, and finally, the intermediate component is prepared with a proper amount of phosphate and a boron-containing substance. The cement composition can endow the magnesium phosphate cement with excellent hydration hardening performance, and the water resistance can be greatly improved. Meanwhile, the source of raw materials needed for preparing the C4AF solid solution is wide, the requirement of magnesium phosphate cement for dead-burned MgO is reduced, and carbon peak reaching / carbon neutralization can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a C-containing 4 Magnesium phosphate cement of AF solid solution and its preparation method. Background technique [0002] Magnesium phosphate cement has a series of advantages such as fast hydration speed, heat release of hydration, high early strength, good fluidity and excellent bonding performance. In recent years, the application field of magnesium phosphate cement has involved repair and reinforcement, emergency repair and construction in severe cold environment, nuclear waste solidification and other fields, showing a good application prospect. [0003] Magnesium oxide, phosphate and retarder are the main components of magnesium phosphate cement. Among them, magnesium oxide is usually calcined at a high temperature above 1600 ° C and then ground to a dead burnt magnesium oxide. Dead-burned magnesia occupies a high proportion in magnesium phosphate cement, up t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02C04B2/10
CPCC04B12/02C04B2/102C04B2/104
Inventor 孙化强汤凡雄
Owner FUZHOU UNIV
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