METHOD OF PRODUCTION OF GRANULATED FILTERING MATERIAL Russian patent published in 2003 - IPC

FIELD: treatment of sewage; water supply systems. SUBSTANCE: proposed method includes introduction of powder-like dolomite into clay suspension followed by mechanical dehumidification of suspension simultaneously with molding, partial drying of molded mixture, crushing of partially dried molds into granules and roasting of granulated material; dolomite is introduced in the amount of 10-20% of mass of clay; partial drying is performed at temperature of 200-400 C and roasting of crushed material is performed at temperature of 800-900 C. EFFECT: enhanced efficiency of cleaning water from humus, suspended particles and ions of heavy metals. 5 tbl