FIELD: chemistry.
SUBSTANCE: invention relates to monolithic refractories, and more specifically to mixtures used for closing tap-holes of blast-furnaces after tapping cast iron and slag. The tap-hole mix contains a refractory component, consisting of oxide and carbon-bearing materials and silicon carbide, and a binding component, consisting of refractory clay and a plasticiser. The refractory component also contains a composite material based on silicon nitride with ferrosilicide binding material, containing iron silicide, silicon and/or iron, in the following ratio of components in wt %: silicon nitride - 60.0 to 95.0; iron silicide - 0.1 to 38.0; silicon - 0.1 to 23.0; iron - 0.1 to 8.0; components of the tap-hole mix are in the following ratio, wt %: refractory component - 50 to 80; binding component - 20 to 50.
EFFECT: increased strength of tap-hole mix.
2 cl, 1 ex, 1 tbl
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