| 摘要 |
A porous filter element comprising at least an elongated, hollow structure closed at one end, arranged so that gases to be cleaned, possibly at high temperatures, are to permeate to the interior of the element before passing through the other open end of the structure, is fabricated from a slurry at least including particles of an anhydrous crystalline mineral of acicular form, such as Wollastonite, by employing known vacuum-forming techniques. The mineral particles desirably have an aspect ratio of at least 10 to 1, and preferably of at least 20 to 1. The increased strength and porosity of such materials of the filter element enable the filter element to have a novel and advantageous re-entrant cross-sectional shape, possibly this shape comprising a multi-pointed star. <IMAGE> |
