SORPTION-FILTRATION MATERIAL, METHOD OF ITS MANUFACTURE, AND METHOD FOR TREATMENT OF LIQUID MEDIA Russian patent published in 1999 - IPC

FIELD: water treatment. SUBSTANCE: invention basically relates to treatment of drinking water or waste water on charging filters with grainy charge of sorption-filtration material based on haelleflinta-type sand. In order to provide quality water and increase filtration cycle and lifetime of sorption- filtration material with lower filtration resistance and increased purification capacity of charge, sand material contains haelleflinta in Na form and sodium modulus 1.15-1.10, which is composed of, wt %: SiO₂ 62.00-75.00, Al₂O₃ 11.50-22.50, Fe₂O₃ 1.40-2.00, Na₂O 3.00-8.80, K₂O 0.30-2.60, CaO 1.89-3.90, MgO 0.52-0.92, MnO 0.01-0.09, TiO₂ 0.06-0.14, P₂O₅ 0.01-0.07. Calcination loss is 0.15-1.10%. Original sand is preliminarily crushed. EFFECT: improved working characteristics. 19 cl, 2 dwg, 7 tbl, 9 ex