A method for preparing high-strength foamed ceramic material using fly ash
A technology of foaming ceramics and fly ash, applied in the field of materials, can solve the problems of destroying the ecological environment, threatening human health, waste of land resources, etc., and achieving the effects of low bulk density, high value and good heat insulation
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Embodiment 1
[0028] Prepare fly ash and clay as raw materials, and prepare magnesia, sodium carbonate, calcium carbonate and sodium metaphosphate as additives; fly ash accounts for 70% by mass percentage in the raw material, and clay accounts for 30%, and magnesium oxide is the total amount of all raw materials in the additive. 5% of the mass, sodium carbonate is 4% of the total mass of all raw materials, calcium carbonate is 4% of the total mass of all raw materials, and sodium metaphosphate is 5% of the total mass of all raw materials;
[0029] Mix all raw materials and additives to form a mixed material, and then use a ball mill for wet grinding, mix evenly and make a slurry; the mass ratio of water, mixed material and grinding balls during wet grinding is 0.5:1:4;
[0030] Inject the slurry into the spray granulator for spray granulation to make powder particles;
[0031] Fill the powder particles into the mold, and then place them in a heating furnace for firing and foaming; the tempe...
Embodiment 2
[0034] Method is with embodiment 1, and difference is:
[0035] (1) Fly ash accounts for 67% by mass percentage in raw materials, and clay accounts for 33%. In the additive, magnesium oxide is 3% of the total mass of all raw materials, sodium carbonate is 5% of the total mass of all raw materials, and calcium carbonate is the total mass of all raw materials. 1% of the mass, sodium metaphosphate is 6% of the total mass of all raw materials;
[0036] (2) The temperature system during the roasting and foaming process is as follows: the furnace temperature rises from room temperature to 700°C at a rate of 7°C / min, holds for 25 minutes, then rises to 1000°C at a rate of 2°C / min, and holds for 80 minutes ;
[0037] (3) The bulk density of the high-strength foamed ceramic material is 0.923g / cm 3 , the compressive strength is 27.45MPa, and the thermal conductivity is 0.29W / (m·K).
Embodiment 3
[0039] Method is with embodiment 1, and difference is:
[0040](1) Fly ash accounts for 76% by mass percentage in raw materials, and clay accounts for 24%. Magnesium oxide is 6% of the total mass of all raw materials in the additive, sodium carbonate is 1% of the total mass of all raw materials, and calcium carbonate is the total mass of all raw materials. 5% of the mass, sodium metaphosphate is 3% of the total mass of all raw materials;
[0041] (2) The temperature system during the roasting and foaming process is as follows: the furnace temperature is raised from room temperature to 850°C at a rate of 10°C / min, kept for 15 minutes, and then raised to 1150°C at a rate of 5°C / min, kept for 50 minutes ;
[0042] (3) The bulk density of the high-strength foamed ceramic material is 0.715g / cm 3 , the compressive strength is 18.92MPa, and the thermal conductivity is 0.24W / (m·K).
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