Magnesium silicate ceramic material and preparation method thereof
A technology of magnesium silicate and ceramics, which is applied in the technical field of resource utilization of waste mines and waste slag and in the field of materials, can solve problems such as lack of utilization channels, environmental pollution, and occupation of land resources, and achieve high product added value, good thermal insulation performance, The effect of simple production process
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example 1
[0059] The specific preparation method of this example is as follows:
[0060] (1) Serpentine is placed in the dryer for 60 ℃ Dry for 90 minutes, and crush in a closed-circuit crushing manner to obtain a first powder with a moisture content of 4%. The first powder includes 30% MgO, 38% SiO 2 , 10% CaO, 8% Fe 2 o 3 and 4% Al 2 o 3 , and the balance is unavoidable substances. The particle size of the first powder is 50-100 μm.
[0061] Then, the first powder is placed in a precalciner kiln from room temperature to 1200° C., and then fired at 1200° C. for 10 minutes to obtain a second powder whose main crystal phase is olivine. Wherein, the heating rate is 15° C. / h.
[0062] (2) Mix the first powder, fly ash powder and yellow sand powder according to the mass ratio of 60:15:25, and mix them in a dry powder mixer for 30 minutes to obtain the mixed material powder. Among them, the particle size of quicklime powder and fly ash powder is 45-75 μm.
[0063] (3) The mixed mater...
example 2
[0067] The specific preparation method of this example is as follows:
[0068] (1) Place the serpentine beneficiation tailings in a dryer to dry, and crush in a closed-circuit crushing manner, and dry at 70° C. for 120 minutes to obtain a first powder with a moisture content of 3%. The first powder consists of 38% MgO, 32% SiO 2 , 5% CaO, 10% Fe 2 o 3 and 5% Al 2 o 3 , and the balance is unavoidable substances; the particle size of the first powder is 10-100 μm.
[0069] Then put the first powder in a rotary kiln, raise the temperature from room temperature to 750° C. at a rate of 10° C. / min, keep it for 60 minutes and bake to obtain the second powder whose main crystal phase is olivine.
[0070] (2) Mix the second powder, illite clay waste slag powder and bentonite waste slag powder at a mass ratio of 80:10:10, and mix them in a dry powder mixer for 30 minutes to obtain a mixed material powder. Among them, the illite clay waste residue powder and bentonite waste residue...
example 3
[0075] The specific preparation method of this example is as follows:
[0076] (1) Put the chrysotile beneficiation tailings in a dryer, dry at 130° C. for 40 minutes, and crush in a closed-circuit crushing manner to obtain a first powder with a moisture content of 1%. The first powder consists of 35% MgO, 38% SiO 2 , 2% CaO, 12% Fe 2 o 3 and 5% Al 2 o 3 , the particle diameter of the first powder is 10-150 μm.
[0077] Then put the first powder in a shaft kiln to raise the temperature to 850° C. at 5° C. / min, and bake for 30 minutes to obtain the second powder whose main crystal phase is olivine.
[0078] (2) Mix the first powder, the second powder, calcium carbide slag powder and waste glass powder according to the mass ratio of 60:15:10:15, and mix them in the dry powder mixer for 30 minutes to obtain the mixed material powder body. Among them, the particle size of calcium carbide slag powder and waste glass powder is 45-75 μm.
[0079] (3) Use a wet method to granu...
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