A kind of magnesium-based cementitious material and its preparation method and application
A magnesium-based adhesive and clinker technology, applied in the field of cement chemical industry, can solve the problems of loss of strength, poor water resistance of magnesium oxychloride cement, and limitations on the application of magnesium-based cementitious materials
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[0034] The present invention also provides the preparation method of the above-mentioned magnesium-based cementitious material, comprising the following steps:
[0035] The magnesite and sandstone are mixed, and the obtained mixture is processed by molding to obtain molding raw meal;
[0036] calcining the raw meal to obtain clinker;
[0037] Mixing and shaping the clinker with water to obtain a primary cementitious material;
[0038] The primary cementitious material is subjected to carbonization curing to obtain the magnesium-based cementitious material.
[0039] In the present invention, magnesite and sandstone are mixed, and the obtained mixed material is subjected to molding treatment to obtain molding raw material.
[0040] Before the mixing, the present invention preferably further includes crushing and grinding the magnesite and sandstone respectively. The present invention does not specifically limit the specific implementation of the crushing and grinding, and operat...
Embodiment 1
[0056] The components of magnesite and sandstone described in this example are shown in Table 1.
[0057] Composition of magnesite and sandstone described in Table 1 Example 1
[0058] Loss on ignition (%) CaO(%) SiO 2 (%)
Al 2 O 3 (%)
Fe 2 O 3 (%)
MgO(%) magnesite 46.975 0.89 1.23 2.880 5.75 43.025 sandstone 6.381 5.366 74.887 8.142 3.406 1.223
[0059] The above-mentioned loss on ignition is water, carbon dioxide and other gaseous components that can be lost at 900°C.
[0060] The magnesite and sandstone are crushed and ground to obtain magnesite with a median particle size of 100 μm and sandstone with a median particle size of 150 μm;
[0061] The above-ground 70.6 g magnesite and 29.4 g sandstone are mixed uniformly, and the obtained mixture is granulated by a roller machine to obtain a shaped raw meal with a diameter of 20-30 mm.
[0062] The obtained molding raw meal is first calcined at a temperature of 8...
Embodiment 2
[0067] The magnesite and sandstone are crushed and ground to obtain magnesite with a median particle size of 100 μm and sandstone with a median particle size of 110 μm;
[0068] The above-ground 70.6 g magnesite and 29.4 g sandstone are mixed uniformly, and the obtained mixture is granulated by a roller machine to obtain a shaped raw meal with a diameter of 20-30 mm.
[0069] The obtained shaped raw meal is first calcined at a temperature of 850 ° C for 1 hour, then heated to 1200 ° C and calcined for 1 hour, and then sequentially cooled (cooled to room temperature) and ground to obtain clinker. The particle size of the clinker is D90<150μm .
[0070] The obtained 10 g of clinker powder and 2.5 g of water were mixed, the obtained mixed material was poured into a mold, and pressed to form a primary gelling material.
[0071] The obtained primary gelling material was cured for 1 hour in an environment where the carbon dioxide concentration was 80%, the air pressure was normal p...
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