METHOD OF PRODUCING SLAG-FORMING MIXTURE Russian patent published in 1994 - IPC

FIELD: metallurgy. SUBSTANCE: method involves mixing lignin with mineral filler followed by calcination at 400-1200 C, coefficient of excess of air SiO₂ being 0.5-0.9. Mentioned above filler contains α as a base, ratio lignin: filler being 1:0.25-2.0 as calculated for dry compound. Said filler additionally contains slag of cryolite production, its quantity being 40-80 mass %, quantity of material containing SiO₂ 20-60 as a base being 20-60 mass % . Slag of cryolite production is also used as CaO- and F - containing component of slag-forming mixture. EFFECT: improves protective and lubrication properties of desired product. 2 cl, 3 tbl