SLAG FORMING MIXTURE FOR PONY LADLE Russian patent published in 2011 - IPC B22D11/111 

FIELD: metallurgy.

SUBSTANCE: invention refers to ferrous metallurgy, particularly to compositions of slag forming mixtures used for heat insulation and protection of bath level in pony ladle from secondary oxidation at continuous steel casting. Slag forming mixture contains, wt %: carbon containing material 7-22, pegmatite fine milled 30-35, fluorspar fluorite concentrate 7-10, cement - the rest. Also, mixture has the following chemical composition, wt %: 5.0-17.0 % C; 33.0- 45.0 % CaO; 28.9-37.0 % SiO₂; 6.5-9.0 % Al₂O₃; ≥3.0 % F; ≥1.0 % Na₂O; ≥0.7 % K₂O at ratio CaO/SiO₂=0.9-1.4.

EFFECT: increased heat-insulating capacity of mixture, reduced surface defects due to stabilisation of temperature-rate mode, reduced contamination with non-metallic inclusions.

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