Porous ceramic prepared from red mud and coal ash and preparation method thereof
A technology of porous ceramics and fly ash, which is applied in the field of porous ceramics, can solve problems such as land occupation and environmental pollution, and achieve the effects of reducing land occupation, simple preparation process and being beneficial to environmental protection.
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[0038] Example 1:
[0039] Take 60% of the red mud, 15% of fly ash, 20% of coal powder, and 5% of borax by weight, and mix evenly, and add 15% of the water of the above composition to continue to mix evenly. Press molding on a tablet press, molding pressure is 12MPa. Put the formed body into an oven at 100°C for 5 hours. Put the dried green body into a roasting furnace for firing at a sintering temperature of 1080°C. After cooling in the furnace, the finished porous ceramics of red mud and fly ash are made. The roasting procedure is as follows:
[0040] 30-450℃ 105min
[0041] Keep 450℃ for 60min
[0042] 450-600℃ 75min
[0043] 600-1080℃ 95min
[0044] Keep at 1080℃ for 40min
[0045] The prepared porous ceramic sample was tested to show a porosity of 47.43% and a flexural strength of 14.45MPa.
Example Embodiment
[0046] Example 2:
[0047] Take 45% of the red mud, 35% of fly ash, 15% of coal powder, and 5% of borax by weight, and mix them evenly, plus 15% of the water of the above composition. Press molding on a tablet press, molding pressure is 12MPa. Put the formed body into an oven at 100°C for 5 hours. Put the dried green body into a roasting furnace for firing at a sintering temperature of 1080°C. After being cooled in the furnace, the finished porous ceramics of fly ash and red mud are made. The roasting procedure is as follows:
[0048] 30-450℃ 105min
[0049] Keep 450℃ for 60min
[0050] 450-600℃ 75min
[0051] 600-1080℃ 95min
[0052] Keep at 1080℃ for 40min
[0053] The prepared porous ceramic sample has a porosity of 51.12% and a flexural strength of 12.45MPa.
Example Embodiment
[0054] Example 3:
[0055] Take 70% of the red mud, 8% of fly ash, 20% of coal powder, and 2% of borax by weight, and mix them evenly, plus 15% of the water of the above composition. Press molding on a tablet press, molding pressure is 12MPa. Put the formed body into an oven at 100°C for 5 hours. Put the dried green body into a roasting furnace for roasting at a sintering temperature of 1000°C. After being cooled in the furnace, the finished porous ceramics of fly ash and red mud are made. The firing procedure is as follows.
[0056] 30-450℃ 105min
[0057] Keep 450℃ for 60min
[0058] 450-600℃ 75min
[0059] 600-1000℃ 90min
[0060] Keep at 1000℃ for 40min
[0061] The prepared porous ceramic sample has a porosity of 49.46% and a flexural strength of 13.58MPa.
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