PROCEDURE FOR FABRICATION OF GRANULES FOR DILUTION OF STEEL MELTING SLAG Russian patent published in 2011 - IPC C22B7/04 B22D41/00 

FIELD: metallurgy.

SUBSTANCE: procedure consists in pelletising cleaning rejects of aluminium slag of size not over 150 mcm into granules, and in charging a portion of granules into roasting equipment of a shaft type with layer not less, than one metre. By means of a burner lower layers of granules are ignited to temperature of 840°C for not more, than 5 minutes to initiate process of self-propagating high temperature synthesis. Into the zone of combustion there is supplied air at coefficient of oxygen consumption K=1.3Cs, where Cs is coefficient for stoichiometry of aluminium oxidising reaction. Upon roasting granules have the following composition, wt %: Al₂O₃ 50-60, Al_met 3-5, SiO₂ 6-8, S not more 0.2, P not more 0.2, N to 1, oxides and metal chlorides - the rest.

EFFECT: extended facilities for more efficient utilisation of total weight of slag forming mixture.

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