電気浸透による水酸化アルミニウムゲルの脱水

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An electro-osmosis apparatus equipped with porous carbon electrodes and with pressing and reducing filtration mechanisms was newly designed for the dehydration of aluminum hydroxide gels that were recovered in the process of waste water treatment at a mill that manufactures electrolytic aluminum foil. The reducing mechanism enabled easy release of the transuded solutions from the surface of carbon electrodes that also served as a filter. The pressing mechanism served to accelerate the decrease in water content by acting not only as a filter press but also as a suppressor of crack formation in the gels during electro-osmosis. The water content in aluminum hydroxide gels decreased to about 70mass% by the application of a dc field at 15V/cm (25mA/cm^2) for 2h at pneumatic press pressure and aspirator pressure of 780kPa and 93kPa, respectively, while that in the gels dewatered by mechanical filtration could only be decreased to about 90mass% or less. The dewatering was accompanied by the transport of electrolytes dissolved in the gels as impurities, leading to an improvement in the purity of the recovered aluminum hydroxide. On the other hand, the dehydration efficiency during electro-osmosis decreased progressively with the decrease in electrical conductivity of the solution in the gels, and at the same time the electric power was consumed as Joule heat. The water that remained in the aluminum hydroxide after dehydration by electro-osmosis was evaporated easily by microwave drying.
日本粘土学会の論文
2000-08-10

電気浸透による水酸化アルミニウムゲルの脱水

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