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A kind of preparation method of magnesium phosphate foamed cement
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A technology of foamed cement and magnesium phosphate, which is applied in the field of building materials, can solve the problems of magnesium phosphate foamed cement, etc., and achieve the effect of improving retarding effect, obvious social and economic benefits, and accelerating the decomposition of hydrogen peroxide
Active Publication Date: 2021-04-02
CHINA WEST CONSTR GRP +1
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Problems solved by technology
However, prior art studies have shown that the setting time of heavy magnesium oxide is too fast, so it cannot be used as a raw material for preparing magnesium phosphate foamed cement
Method used
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Embodiment 1
[0023] A preparation method of magnesium phosphate foamed cement, comprising the steps of:
[0024] S1. Dissolve ferric chloride in water to prepare a ferric chloride solution with a concentration of 60g / L.
[0025] S2. Add 2kg of ferric chloride solution and 2kg of borax into 2kg of water to obtain a mixed solution.
[0026] S3, mix 40.57kg heavy magnesia with 27.58kg potassium dihydrogen phosphate powder, then add the mixed solution prepared in step S2 to the mixed powder, then quickly add 27.82kg hydrogen peroxide, stir and pour into the test mold; , the mass fraction of hydrogen peroxide in hydrogen peroxide is 30%, that is, the mass ratio of hydrogen peroxide to water is 14:1.
[0027] S4. Molding to obtain a sample.
Embodiment 2
[0029] The steps of the preparation method are the same as in Example 1, except that the amount of water used in step S2 is 14.91 kg, and the amount of hydrogen peroxide used in step S3 is 14.91 kg, that is, the ratio of hydrogen peroxide to water is 1:1.
Embodiment 3
[0031] The steps of the preparation method are the same as in Example 1, except that the amount of water used in step S2 is 20.87 kg, and the amount of hydrogen peroxide used in step S3 is 8.95 kg, that is, the ratio of hydrogen peroxide to water is 3:7.
[0032] Carry out density and compressive strength test to the sample prepared by embodiment 1,2,3, see structure figure 1 and figure 2 . It can be seen that when the ratio of hydrogen peroxide to water is 14:1, the average density of the sample is 780kg / m 3 , The 28-day strength is 4.3MPa. When the ratio of hydrogen peroxide to water is 1:1, the average density of the sample is 838kg / m 3 , The 28-day strength is 5.6MPa. When the ratio of hydrogen peroxide to water is 3:7, the average density of the sample is 972kg / m 3 , The 28-day strength is 7.3MPa. The ratio of hydrogen peroxide to water is different, and the density and compressive strength of the prepared magnesium phosphate foamed cement are different. Therefore...
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Abstract
The invention discloses a preparation method of magnesium phosphate foaming cement. The preparation method includes the steps: S1 preparing ferric chloride solution; S2 adding the ferric chloride solution and borax into a certain water to obtain mixed solution; S3 uniformly mixing heavy magnesium oxide and dihydric phosphate powder, adding the mixed solution prepared in the step S2 into mixed powder, rapidly adding hydrogen peroxide, uniformly stirring mixture, and pouring the mixture into a test mold; S4 forming. The raw materials comprise, by weight, 35-45 parts of heavy magnesium oxide, 25-30 parts of monopotassium phosphate, 2-3 parts of borax, 7-30 parts of hydrogen peroxide, 2-20 parts of water and 2-3 parts of ferric chloride solution. According to the method, the heavy magnesium oxide replaces conventional refiring magnesium oxide to serve as a raw material to prepare the magnesium phosphate foaming cement, the method solves the problem that magnesium phosphate foaming cement is difficultly prepared by heavy magnesium oxide in the prior art, energy consumption is reduced, cost is saved, and the prepared magnesium phosphate foaming cement is good in stability.
Description
technical field [0001] The invention belongs to the technical field of building materials, in particular to a process for preparing magnesium phosphate foamed cement with certain strength and low density. Background technique [0002] Magnesium phosphate cement is mainly composed of magnesium oxide, phosphate and retarder in a certain proportion. Magnesium phosphate cement has the advantages of fast setting, high early strength, strong adhesion, dry shrinkage, wear resistance, and frost resistance. It is a new type of gel material with great research value, energy saving and environmental protection. Compared with cement-based materials, magnesium phosphate cement materials have outstanding high temperature resistance. Magnesium phosphate foamed cement has good thermal insulation and high temperature resistance, and has a low density. It is often used in lightweight wall blocks and wall panels. At present, the magnesium phosphate foaming process generally uses dead-burned ...
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