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Waste Management & Research, Vol. 14, No. 3, 281-295 (1996)
DOI: 10.1177/0734242X9601400304

Preparation of Ceramic Membrane Filters, From Waste Fly Ash, Suitable for Hot Gas Cleaning

Y.M. Jo

School of Chemical Engineering, University of New South Wales, P.O. Box 1, Kensington, N. S.W. 2033, Australia

R. Huchison

School of Chemical Engineering, University of New South Wales, P.O. Box 1, Kensington, N. S.W. 2033, Australia

J.A. Raper

School of Chemical Engineering, University of New South Wales, P.O. Box 1, Kensington, N. S.W. 2033, Australia

The preparation and performance of ceramic membrane filters made from fly ash from coal-fired power stations were investigated. The porous and crack-free ceramic composite membrane was prepared by dip-coating a stainless steel mesh in a slurry of fly ash. Membrane properties investigated included pore structure, permeability and mechanical strength. The ash membrane filter shows great potential for the filtration and microfiltration of high-temperature gas-particulate streams, and reuses waste fly ash composed of multiple oxides with a wide size distribution. The median pore size of the tested membrane was 2.3 µm and the differential pressure gradient was 0.9 kPa 1-1 min-1, which is comparable to fabric filters currently in use in some New South Wales power stations. The high mechanical strength of the membrane was caused by fusion of the glassy material in the fly ash. Since the membrane consists of metal and ceramic composities, it also shows good flexibility.

Key Words: Fly ash • ceramic membrane • hot gas cleaning • composite membrane filter • dip-coating.


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