METHOD AND DEVICE FOR FILTERING SOLUTIONS OR LIQUID MEDIA WITH HARD IMPURITIES Russian patent published in 1996 - IPC

FIELD: petroleum, mining industries. SUBSTANCE: raw material is fed to steep sloping portion of filtering sieve having the shape of blade line in longitudinal section perpendicularly to steep sloping portion by means of hydrodynamic screen in the form of bent plate disposed opposite the steep sloping portion. Hydrodynamic screen of device is fastened on housing rigidly or cantilevered on terminal portion which is disposed parallel to gently sloping sieve portion following the steep sloping one and creates additional pressure on material on gently sloping portion. When material is displaced along sieve it is periodically subjected to aggregation and disaggregation with simultaneous drying. Large-sized impurities are picked and are taken aside from purified liquid medium. EFFECT: enhanced efficiency. 5 cl, 6 dwg