Non-cement light alumina magnesia cast material and its prepn process
A cement-free and castable technology, applied in the field of refractory materials, can solve the problems of structural spalling and lowering of medium-temperature strength, and achieve the effects of high porosity, high medium-temperature strength, and high resistance to medium erosion.
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Embodiment 1
[0011] An aluminum-magnesium-based lightweight cement-free castable and a preparation method thereof: porous spinel ceramics with a particle size of 5-3 mm, porous spinel ceramics with a particle size of 3-1 mm, and porous spinel ceramics with a particle size of 1-0.2 mm Porous spinel ceramics, magnesia fine powder, corundum fine powder, spinel fine powder, silica micropowder and activated α alumina micropowder respectively according to 10~30wt%, 20~40wt%, 10~25wt%, 1~20wt% 5wt%, 2~10wt%, 2~4wt%, 1~3wt% and 1~5wt% mixed, plus 10~12wt% water of the above mixture, 0.2wt% sodium hexametaphosphate and 0.05wt% citric acid Stir evenly, pour and vibrate to form. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.
[0012] Among them, the apparent porosity of porous spinel ceramics is 40-45%, Al 2 o 3 The content is 68-71wt%, and the average pore size is 10-15μm; the particle size of magnesia fine powder is less than 88μm, and the...
Embodiment 2
[0015] An aluminum-magnesium-based lightweight cement-free castable and its preparation method: porous corundum-spinel ceramics with a particle size of 5-3 mm, porous corundum-spinel ceramics with a particle size of 3-1 mm, and a particle size of 1-0.2mm porous corundum-spinel ceramics, magnesia fine powder, corundum-spinel fine powder, corundum fine powder, silicon oxide fine powder and activated α-alumina fine powder are respectively 10-35wt%, 15-45wt% , 10-25wt%, 6-9wt%, 5-8wt%, 2-4wt%, 1-3wt% and 1-5wt% mixed, plus 11.5-13wt% water of the above-mentioned mixture, 0.25wt% tripolyphosphoric acid Sodium and 0.02wt% sodium citrate are evenly mixed, poured and vibrated to form. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.
[0016] Among them, the apparent porosity of porous corundum-spinel ceramics is 45-50%, Al 2 o 3 The content is 78-82wt%, and the average pore size is 1-5μm; the particle size of magnesia fine powd...
Embodiment 3
[0019] An aluminum-magnesium-based lightweight cement-free castable and a preparation method thereof: porous corundum ceramics with a particle size of 5 to 3 mm, porous corundum ceramics with a particle size of 3 to 1 mm, and porous corundum ceramics with a particle size of 1 to 0.2 mm , magnesia fine powder, corundum fine powder, silicon oxide fine powder and activated α-alumina fine powder according to 10~30wt%, 20~50wt%, 10~25wt%, 4~8wt%, 10~15wt%, 2~4wt% respectively It is mixed with 3-5wt%, and 12.5-15wt% of water, 0.3wt% of sodium tripolyphosphate and 0.02wt% of citric acid are added to the above-mentioned mixture, mixed evenly, and poured and vibrated for molding. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.
[0020] Among them, the apparent porosity of porous corundum ceramics is 38-45%, Al 2 o 3 content>95wt%, average pore size is 5-10μm; magnesia fine powder particle size is less than 44μm, MgO content>95wt...
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