FILTERING ELEMENT FOR NATURAL AND SEWAGE WATER PURIFICATION

摘要

The invention concerns to filtering rigid elements/blocks. Known filtering block-elements, which are used, for example, in water-economic and municipal services, are not cold-resistant in the water-saturated condition and do not stand the deformations arising at freezing of water in pores of a material. The given invention offers a rigid filtering cold-resistant element on the basis of fractioned granular mineral material (sand, gravel, rubble, crushed stone, expanded clay aggregate, broken brick or ceramics, shiver of glass) and thermoplastic polymers (polyethylene, polypropylene, polyethylene terephthalate) used as adhesive. Specified thermoplastic polymers at negative temperatures are capable to the large reversible (highly elastic) deformations and provides frost resistance of a filtering element in the water-saturated condition at negative temperatures of application. Formation of a filtering element occurs as a result of flowing the melted polymer around/over the preliminary heated up surface of mineral granular material. The particles of polymer are thoroughly contacted in the mixer with grains of mineral material warmed up to melting temperature of polymer and are sticked together with grains of mineral aggregate. During mixing of components formation of a polymeric film on each grain of mineral material takes place. Then the mass is taken from the mixer, and the filtering element is formed at pressure up to 1.0 MPa. It hardens while cooling that determines readiness of a product for application.