| 摘要 |
1366340 Filter bed medium WASAG CHEMIE GmbH 30 Dec 1971 [28 Jan 1971] 60710/71 Heading BID [Also in Division Cl] Suspended solids are removed from a liquid, e.g. water, by filtering the liquid in a gravity or pressure filter composed of solid microspheres of a slag having a grain density in the range 1.0-2.2 g/cc. and a diameter of 0.3-10 mm., the finer particles having the higher density and being at the bottom of the filter bed. In the Example a filter bed comprises a base of coarse silica having a diameter greater than 10 mm., above which is disposed a perforated sieve plate supporting the microspheres. |
