Calcium hexaluminate prepared by aid of anodic oxidation waste residues of aluminum section factory and method for preparing calcium hexaluminate
An anodizing and aluminum profile factory technology, applied in the field of calcium hexaaluminate and its preparation, to achieve the effect of low raw material cost, large surface area and high activity
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[0019] The specific steps of the preparation method of the calcium hexaaluminate material prepared from the anodic oxidation waste residue of the aluminum profile factory are as follows:
[0020] 1) According to the formula, put the anodic oxidation waste residue and limestone in the aluminum profile factory into a ball mill for 12 hours, and the ground slurry is filtered and dehydrated, dried at 100°C and crushed to obtain a total material of less than 30 mesh;
[0021] 2) Add the binder PVA, mix evenly in the mixer, trap the material for 12 hours, and press the mixture into shape;
[0022] 3) The molded sample was dried at 100°C for 12 hours;
[0023] 4) The sample is placed in a kiln for reaction sintering, the reaction sintering temperature is 1400-1600°C, the reaction sintering holding time is 2-5 hours, and the furnace is cooled to room temperature to obtain high-purity calcium hexaaluminate material.
Embodiment 1
[0025] The weight ratio of the raw material formula in this example is: 78wt% of the anodic oxidation waste residue of the aluminum profile factory, and 22wt% of the limestone. Weigh the two raw materials according to the formula, place them in a ball mill and grind them for 12 hours. The ground slurry is filtered and dehydrated, dried and crushed at 100°C to obtain a total material of less than 30 meshes; add binder PVA and mix evenly in a mixer , the material was trapped for 12 hours, and the mixed material was pressed into shape; the formed sample was dried at 100°C for 12 hours; the sample was placed in a kiln for reaction sintering, the reaction sintering temperature was 1400°C, the holding time was 5 hours, and the furnace was cooled to At room temperature, the obtained calcium hexaaluminate material contains CA 6 (CaAl 12 o 19 ): 85%, CA 2 (CaAl 4 o 7 ): 6.6%, Al 2 o 3 :8.4% (mass ratio, the same below).
Embodiment 2
[0027] The weight ratio of the raw material formula in this example is: 78wt% of the anodic oxidation waste residue of the aluminum profile factory, and 22wt% of the limestone. Weigh the two raw materials according to the formula, place them in a ball mill and grind them for 12 hours. The ground slurry is filtered and dehydrated, dried and crushed at 100°C to obtain a total material of less than 30 meshes; add binder PVA and mix evenly in a mixer , the material was trapped for 12 hours, and the mixed material was pressed into shape; the formed sample was dried at 100°C for 12 hours; the sample was placed in a kiln for reaction sintering, the reaction sintering temperature was 1500°C, the holding time was 4 hours, and the furnace was cooled to At room temperature, the obtained calcium hexaaluminate material contains CA 6 (CaAl 12 o 19 ): 88%, CA 2 (CaAl 4 o 7 ):5.1%, Al 2 o 3 :6.9%.
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