RAW MIX FOR PREPARING EXPANDES CLAY AGGREGATE Russian patent published in 2001 - IPC

FIELD: building materials industry, more particularly use of residue resulting from filtration of wash sewage containing phenylphosphoric acid slats and sodium carbonate for preparing building gravel. SUBSTANCE: raw mix comprises clay and organic additive (residue prepared from filtration of wash sewage in plasticizer (triarylphosphate) production. Residue contains 70% of phenylphosphonic acid salts and 30% of sodium carbonate, ratios of components being as follows; said organic additive, 1.10-1.82; and clay, 98.18-98.90. EFFECT: improved service characteristics of expanded clay aggregate. 3 ex, 2 tbl