New flexible ceramic filter media for microfiltration

M. ten Hove, M. Barsacchi, G. Gadafalch Gazquez*, Eurekite B.V., Netherlands

Filtration of microparticles, with high fluxes, high capacity in hash environments is challenging. (Sub)micron non-woven mats structures obtained with polymeric materials have shown limitations both in temperature resistance and durability in harsh environments. Filters based on sintering of metal fibers, up to 400°C or metal powders, for higher temperatures are typically used. Their use is often limited by their relative high cost, very low porosity or both.

Ceramic non-woven mats composed of submicron diameter fibers can be produced by spinning techniques. Those non-woven mats, shown in SEM picture in fig 1, can be designed in a range of typically 10 to 150 mm thickness, show porosity as high as 95% with average pore sizes as small as 2-3 µm and are flexible up to 2 mm of radius. The diameter of the fiber can be varied between 100 and 1000 nm and with different packing densities, so that the average size and distribution of the pore sizes can be designed as needed. Because of the 100% ceramic nature the nonwoven mats are very high temperature resistant till above 1000°C and impervious to many harsh corrosive or aggressive environments.

A study has been therefore conducted to evaluate the performances of such nonwoven mats in filtration. Yttria stabilized zirconia non-woven mats with a fiber diameter of 1 µm, a thickness of 65 µm and a packing density of 9.8% have been characterized in terms of pressure drop, efficiency and dirt-holding capacity. In parallel simulations were performed with GeoDict software (Math2Market).Results from the tests show that...

Session: F8 - Micro and Nanofiltration Media
Day: 23 October 2019
Time: 16:45 - 18:00 h

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