Method for preparing aluminum oxide ceramic filter plate based on aluminum ash
A technology of alumina ceramics and filter plates, which is applied in chemical instruments and methods, filtration separation, membrane filters, etc., can solve the problems of difficult output to meet demand, high production costs, and resource consumption of ceramic filter plates, and achieve fuel consumption less, reduce production costs, and save natural resources
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Embodiment 1
[0025] Embodiment 1: the method for preparing alumina ceramic filter plate based on aluminum ash
[0026] Take 40 parts of aluminum ash (containing Al 5%, AlN 8%, Al 2 o 3 82%, SiO 2 0.5%, MgO 0.5%, CaO 0.5%, Fe 2 o 3 0.3%, the rest are chlorine salt and fluorine salt impurities), 60 parts of alumina (purity 99%) are mixed evenly, plus 3 parts of aluminum hydroxide binder, 1 part of aluminum fluoride, the above powder and water according to 1: 1 weight ratio, wet milled to 325 mesh with a ceramic ball mill jar to make a slurry.
[0027] Take a 30PPI polyurethane foam board and soak it in the above slurry. After the slurry is evenly soaked, take out the polyurethane foam board and squeeze out the excess slurry; dry the polyurethane foam board body soaked in the slurry for 24 hours naturally, and then dry it at 150°C 12h.
[0028] Then sintering is carried out at 1450°C. The specific heating system is: the heating rate is 30°C / h in the 0-300°C stage, the heating rate is ...
Embodiment 2
[0030] Embodiment 2: the method for preparing alumina ceramic filter plate based on aluminum ash
[0031] Take 90 parts of aluminum ash (containing Al 3%, AlN 5%, Al 2 o 3 85%, SiO 2 0.3%, MgO 0.5%, CaO 0.3%, Fe 2 o 3 0.3%, the rest are chloride salt and fluoride salt impurities), 10 parts of alumina (alumina purity 99%) are mixed evenly, plus 3 parts of aluminum hydroxide binder, 3.5 parts of aluminum fluoride, the above powder and water according to Mix at a ratio of 4:1, and wet grind to 325 mesh with a ceramic ball mill jar to make a slurry.
[0032] Take a 40PPI polyurethane foam board and soak it in the above slurry; after the slurry is evenly soaked, take out the polyurethane foam board and squeeze out the excess slurry; dry the polyurethane foam board body with the slurry in the air for 24 hours, and then dry it at 150°C for 12 hours .
[0033] Then sintering at 1550°C, the specific temperature rise curve is: 0-300°C, 30°C / h, 300-550°C, 20°C / h, 550-1000°C, 5°C / ...
Embodiment 3
[0035] Embodiment 3: the method for preparing alumina ceramic filter plate based on aluminum ash
[0036] Take 50 parts of aluminum ash (which contains Al 4%, AlN 9%, Al 2 o 3 81%, SiO 2 0.3%, MgO 0.5%, CaO 0.3%, Fe 2 o 3 0.3%, the rest are chloride salt and fluorine salt impurities), 50 parts of alumina (alumina purity ≥ 99%) are mixed evenly, plus 5 parts of aluminum hydroxide binder, 2.5 parts of aluminum fluoride, the above powder and water Mix according to the ratio of 3:2, and wet grind to 325 mesh with a ceramic ball mill jar to make a slurry;
[0037] Take a polyurethane foam board with a density of 60PPI and dip it into the above slurry; after the slurry is evenly soaked, take out the polyurethane foam board and squeeze out the excess slurry;
[0038] Air-dry the polyurethane foam slab body with slurry for 24 hours naturally, and dry it at 150°C for 12 hours;
[0039] Then sintering at 1650°C, the specific heating steps are: 0-300°C, 30°C / h, 300-550°C, 20°C / h,...
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