SLAG FORMING MIXTURE FOR STEEL REFINING (VERSIONS) AND BRIQUETTE OUT OF SLAG FORMING MIXTURE (VERSIONS) Russian patent published in 2010 - IPC C21C7/00 C21C7/04 C22B1/242 

FIELD: metallurgy.

SUBSTANCE: slag forming mixture includes components containing aluminium oxide Al₂O₃ in wt % 30÷99. Also, components in its composition are chosen depending on percent contents of Al₂O₃ at the following ratio in wt %: 5÷35 of Al₂O₃ >90; 30÷70 AI₂O₃ from 55 to 90; the rest - Al₂O₃<55 and has the following fraction composition, wt %: >60 of fractions<1 mm, 10÷20 of fractions 1÷10 mm, the rest - of fractions from 10 to 30 mm. With introduction of pure aluminium into the composition of mixture composition of components does not exceed 5 mm. The briquette out of slag forming mixture contains binding at ratio in wt % 1÷4 and compressed particles including aluminium oxide in wt %: 30÷99 or aluminium oxide Al₂O₃ and aluminium in wt %: 30÷99 and 1÷20 correspondingly. Notably, components are chosen depending on contents of Al₂O₃ at the following ratios in wt %: 5÷35 Al₂O₃>90; 30÷70 Al₂O₃ from 55 to 90; the rest -Al₂O₃<55. Particles forming a briquette have the following fraction composition, wt %: >60 of fractions 0÷1 mm; 60>25 of fractions 1÷3 mm; the rest - of fractions 3÷5 mm. Volume of a briquette is 40÷70 cm³, its volume density is 7÷2.0 g/cm³, briquette humidity is within ranges of 1÷5%, while its volume is 40÷70 cm³.

EFFECT: ensuring quality of refined steel and prevention of contact zone of lining and slag from destruction.

12 cl, 2 tbl