RAW MIX FOR PREPARING LIGHT-WEIGHT FILLER Russian patent published in 2001 - IPC

FIELD: building materials industry. SUBSTANCE: raw components for preparing artificial porous filler include waste resulting from processing of black shales. Raw components comprise, wt.%: SiO₂, 59.06; TiO₂, 0.95; Al₂O₃, 16.55; Fe₂O₃ 2.75; CaO, 1.83; MgO, 3.15; K₂O, 2.57; Na₂O, 1.45; P₂O₅, 0.21; CO₂, 2.57; FeO, 4.61; MnO, 0.09; calcination loss, 5.20; C_org, 1.26; dust from electric filters of main aluminium production and liquid glass (silicate module is 4 density is 1.44 g/cu.cm), ratios of components being as follows; waste resulting from processing of black shales, 55.9; dust from electric filters, 9-10; liquid glass, 35.1-34.1. Components are mixed, granules are molded by plastic method and fired by two-step mode; thermal preparation temperature is 400 C and firing temperature is 375 C; bulk density of light-weight filler is 130-142 kg/cubic m. EFFECT: improved properties of the raw mix. 1 tbl