METHOD FOR STEEL MAKING WITH LOW SULPHUR CONTENT Russian patent published in 2013 - IPC C21C5/52 C21C7/76 

FIELD: metallurgy.

SUBSTANCE: method involves production of a semi-finished product in a steel making unit, steel tapping to a ladle, cutoff during furnace slag tapping, addition to the ladle at tapping of solid slag-forming mixture, and out-of-furnace treatment at a furnace-ladle unit. At tapping, solid slag-forming mixture in quantity of 2.0-2.7 kg/t consisting of lime 75-80 wt % and fluorite-sellaite concentrate 20-25 wt % is added to the ladle; treatment is performed at the furnace-ladle unit during 45-75 minutes; at that, in order to complete metal desulphurisation, the same solid slag-forming mixture in quantity of 0.3-0.6 kg/t consisting of lime 75-80 wt % and fluorite-sellaite concentrate 20-25 wt % is added to the ladle; steel is blown with argon during treatment through bottom porous tuyere blocks with flow rate of 20-50 m³/h.

EFFECT: invention allows increasing metal desulphurisation degree and reducing slag thinner consumption.

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