REFRACTORY PRODUCT AND INJECTION NOZZLE Russian patent published in 2015 - IPC C04B35/35 C04B35/06 

FIELD: metallurgy.

SUBSTANCE: refractory product is provided containing refractory particles CaO and refractory particles MgO, that can be used during manufacturing of the injection nozzle for continuous casting of the melted steel. This refractory product contains, based on chemical composition, measured after subjection to heating in non-oxidizing atmosphere at 1000°C, basis CaO and MgO with weight ratio CaO/MgO from 0.1 to 1.5, one or several metal oxides, selected from group comprising B₂O₃, TiO₂, V₂O₅, P₂O₅ and SiO₂, in total quantity from 0.1 to 5.0 wt %, and free carbon in quantity from 2 to 35 wt %. On each CaO surface of the refractory particles an inorganic film with thickness from 0.1 to 25 mcm is observed, it contains CaO and one or several said metal oxides.

EFFECT: prevention of hydration of CaO component of the refractory material at production stage, during storage and during casting for long period, reduced aluminium adhesion to refractory material during casting.

10 cl, 7 tbl, 7 ex, 21 dwg