METHOD OF PREPARING FILTERING MATERIAL FROM PEAT Russian patent published in 1997 - IPC

FIELD: filtering materials for water and air media. SUBSTANCE: method includes preliminary separation of peat from litters, crushing of separated peat to produce its fiber component, and formation of fabric. Separated peat is dried to moisture 15-20%, and, after crushing, peat is expanded, beaten, and its fiber fraction is combed to produce a peat-wool fabric with longitudinally oriented fibers. Fabric is further folded in longitudinal and transverse directions, and thus formed structure is fixed by needle-punching technique until material with surface density 80-700 l/sq.m is obtained. Punch density is chosen within the range 10-20 l/sq.cm. To prepare filtering material, peat with disintegration degree up to 15% is utilized. EFFECT: improved preparation procedure. 3 cl, 2 tbl