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Retarder-free novel magnesium phosphate cement

A technology of magnesium phosphate cement and retarder, applied in the field of building materials, can solve the problem of high cost and achieve the effects of good fluidity, high compressive strength and controllable setting time

Inactive Publication Date: 2018-02-23
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintered magnesia powder used in this invention is still dead-burned magnesia powder, which requires high-grade magnesite raw materials, and the sintering temperature is above 1700°C, so the cost is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of novel magnesium phosphate cement without retarder:

[0025] Step 1: mix the low-grade magnesite powder with a particle size below 200 mesh and boron mud with a particle size below 325 mesh in a weight ratio of 92:8, mix them evenly in a planetary ball mill, and keep warm at 1200°C for 4 hours , cooled to room temperature and ground to below 200 mesh to make synthetic light-burned boron magnesium powder for later use.

[0026] Step 2: Mix 55 parts by weight of synthetic light-burned boron magnesium powder; 20 parts of industrial-grade potassium dihydrogen phosphate; and 25 parts of fly ash to prepare a new type of magnesium phosphate cement without retarder.

[0027] Add the new magnesium phosphate cement without retarder of this embodiment to 22% of the total weight of water, stir at a low speed for 30 seconds in a cement slurry mixer, then stir at a high speed for 90 seconds, and pour it into a mold of 40mm×40mm×160mm Forming, demouldin...

Embodiment 2

[0030] A kind of preparation method of novel magnesium phosphate cement without retarder:

[0031] Step 1: Mix the low-grade magnesite powder with a particle size below 200 mesh and boron mud with a particle size below 325 mesh in a weight ratio of 93:8, mix them evenly in a planetary ball mill, and keep warm at 1200°C for 3.5 hours , cooled to room temperature and ground to below 200 mesh to make synthetic light-burned boron magnesium powder for later use.

[0032] Step 2: Mix 60 parts by weight of synthetic light-burned magnesium boron powder; 18 parts of industrial grade potassium dihydrogen phosphate; and 22 parts of fly ash to prepare a new type of magnesium phosphate cement without retarder.

[0033]Add the new magnesium phosphate cement without retarder of this embodiment to 22% of the total weight of tap water, stir at a low speed for 30s in a cement slurry mixer, then stir at a high speed for 90s, and pour it into a mold of 40mm×40mm×160mm Forming, demoulding after 1...

Embodiment 3

[0036] A kind of preparation method of novel magnesium phosphate cement without retarder:

[0037] Step 1: Mix the low-grade magnesite powder with a particle size below 200 mesh and boron mud with a particle size below 325 mesh in a weight ratio of 92:8, mix them evenly in a planetary ball mill, and keep warm at 1200°C for 3 hours , cooled to room temperature and ground to below 200 mesh to make synthetic light-burned boron magnesium powder for later use.

[0038] Step 2: Mix 60 parts by weight of synthetic light-burned magnesium boron powder; 15 parts of industrial-grade potassium dihydrogen phosphate; and 25 parts of fly ash to prepare a new type of magnesium phosphate cement without retarder.

[0039] Add the new magnesium phosphate cement without retarder of this embodiment to 22% of the total weight of tap water, stir at a low speed for 30s in a cement slurry mixer, then stir at a high speed for 90s, and pour it into a mold of 40mm×40mm×160mm Forming, demoulding after 1 ...

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Abstract

The invention relates to retarder-free novel magnesium phosphate cement. The retarder-free novel magnesium phosphate cement is prepared from the following components in parts by weight: 55 to 65 partsof synthesized light-burned boron-magnesium powder, 18 to 22 parts of acid phosphate and 15 to 25 parts of a reinforcing material, wherein the synthesized light-burned boron-magnesium powder is prepared by mixing low-grade magnesite powder with boron mud according to proportions, keeping warm for 3 to 4 hours at 1200 to 1250 DEG C, cooling to room temperature and milling to 200 meshes or less; aweight proportion of the low-grade magnesite powder to the boron mud is (92 to 95) to (8 to 10); the content of magnesium oxide in the low-grade magnesite powder is smaller than 41 percent, and the granularity is 200 meshes or less; the boron mud is waste residue generated after producing boric acid and borax products, and the granularity is 325 meshes or less. Compared with traditional magnesiumphosphate cement, the synthesized light-burned boron-magnesium powder is formed through low-temperature sintering of low-grade magnesite and is used for replacing dead-burned magnesium oxide powder which is higher in cost, so that the sintering temperature of the magnesium oxide is lowered; meanwhile, the synthesized light-burned boron-magnesium powder which is low in activity is capable of prolonging the condensation time of magnesium phosphate cement and replacing the introduction in of a retarder-borax, so that the cost of the magnesium phosphate cement is greatly reduced.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a novel magnesium phosphate cement material suitable for rapid repair or sealing of radioactive solid substances. Background technique [0002] Magnesium phosphate cement has outstanding properties such as fast setting and fast hardening, high early strength, fast setting speed at low temperature, high bonding strength with old concrete, good frost resistance and wear resistance, and dry shrinkage. Therefore, it is very suitable for expressways , Airstrips, rapid repairs of municipal arterial roads and construction materials, architectural decoration products, dental filling materials, special molds, waste solidification, etc. Ordinary magnesium phosphate cement is generally made by mixing dead-burned magnesium oxide powder, acid phosphate and retarder in a certain proportion. The hydration mechanism of magnesium phosphate cement is essentially an acid-base neutralization and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
Inventor 关岩毕万利孙美硕李想刘宁
Owner UNIV OF SCI & TECH LIAONING
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