Tortuosity and permeability of mesoporous ceramics of kaolin and diatomite
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Universidad Industrial de Santander
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Se reporta la permeabilidad y tortuosidad de cerámicas mesoporosas de caolines y diatomitas. Las muestras cilíndricas con porcentaje en peso de 60 % diatomita, 30 % caolín y 10 % CaCO3, fueron elaboradas por colado, con diámetro promedio de 5 cm y espesor de 0,6 cm. El proceso de secado se realizó mediante estufa de circulación forzada a 100 °C por 24 horas, la sinterización a temperaturas de 800 °C, 850 °C, 900 °C, 950 °C, 1.000 °C y 1.100 °C, usando una mufla eléctrica con una rampa de 5 °C/min. Para la determinación de permeabilidad por el agua, se utilizó un permeámetro de carga variable, mientras que la tortuosidad se halló del producto del factor de forma y su porosidad. Se encontraron resultados de tortuosidad en el rango de 3,32 a 7,16, mientras que la permeabilidad varió entre 3,09x10-6 y 22,2x10-6 cm/s, evidenciándose un comportamiento inverso entre estos parámetros al incrementarse la temperatura.
In this paper, the permeability and tortuosity of mesoporous ceramics of kaolin and diatomite are reported. The cylindrical samples with weight percentages of 60% diatomite, 30% kaolin and 10% CaCO3 were made by casting, with an average diameter of 5 cm and a thickness of 0.6 cm. The drying process was carried out through the forced circulation stove at 100 °C for 24 hours and the sintering at temperatures of 800 °C, 850 °C, 900 °C, 950 °C, 1000 °C and 1100 °C, using an electric muffle with a ramp of 5 °C/min. For the determination of water permeability, a variable load permeameter was used, while the tortuosity was found from the product of the form factor and its porosity. The results of tortuosity were found in the range of 3.32 to 7.16, whereas permeability varied between 3.09x10-6 and 22.2x10-6 cm/s, evidencing an inverse behavior between these parameters when increasing to temperature.
In this paper, the permeability and tortuosity of mesoporous ceramics of kaolin and diatomite are reported. The cylindrical samples with weight percentages of 60% diatomite, 30% kaolin and 10% CaCO3 were made by casting, with an average diameter of 5 cm and a thickness of 0.6 cm. The drying process was carried out through the forced circulation stove at 100 °C for 24 hours and the sintering at temperatures of 800 °C, 850 °C, 900 °C, 950 °C, 1000 °C and 1100 °C, using an electric muffle with a ramp of 5 °C/min. For the determination of water permeability, a variable load permeameter was used, while the tortuosity was found from the product of the form factor and its porosity. The results of tortuosity were found in the range of 3.32 to 7.16, whereas permeability varied between 3.09x10-6 and 22.2x10-6 cm/s, evidencing an inverse behavior between these parameters when increasing to temperature.
Keywords
form factor, tortuosity, permeability, electrical resistivity, mesoporous ceramics, factor de forma, tortuosidad, permeabilidad, resistividad eléctrica, cerámica mesoporosa