Synthetic granular filter material

专利名称：Synthetic granular filter material发明人：Gene Hirs申请号：US06/023469申请日：19790323公开号：US04197208A公开日：19800408

摘要：Synthetic, granular filter particles which are of substantially uniform size, ofcontrolled density, and water-wettable. A method is provided for manufacturing suchparticles in uniform sizes ranging from about 1/16 to about 3/8 inch and at controlleddensities ranging from a specific gravity of about 1.04 to about 1.5. The particlescomprise hollow silica beads dispersed in a matrix of cured cement. In deep bed, multi-layer liquid filters, the particles can be utilized as the upper strata of the filter and act asa barrier for particles that would normally plug a deep bed filter having conventional,natural materials, such as sand in the lower strata. Alternatively, all of the strata of thedeep bed filter may be comprised of the particles of the present invention in

substantially uniform, controlled sizes and densities, the size of the particles decreasingand the density of the particles increasing in the direction of flow through the filter bed.

申请人：HIRS, GENE

代理机构：Irons and Sears

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