PROCESS FOR MANUFACTURING FIRECLAYS Russian patent published in 1997 - IPC

FIELD: refractory industry, particularly, manufacture of unroasted refractories. SUBSTANCE: process for preparing unroasted fireclays comprises grinding silicate lump with fireclay and hardener, mixing the resulting binder for 3 or 4 minutes at temperature of 50-60 C with fireclay filler, adding plasticizer based on sodium salts of product of condensation of naphthalenesulfonic acid and formaldehyde with flooding water, finally stirring the whole for 4-6 min pressing at 20 MPa and subsequently drying the resulting product at 200-250 C for 1-1.5 h. The hardener is nepheline slurry. EFFECT: greater placeability of concrete mixture, reduced power consumption and improved physical and mechanical characteristics of concrete. 2 cl, 1 tbl