REFRACTORY CONCRETE MIXTURE FOR HEARTH LINING OF THERMAL UNITS Russian patent published in 2017 - IPC C04B35/105 C04B35/66 

FIELD: metallurgy.

SUBSTANCE: refractory concrete mixture contains high alumina calcium aluminate cement containing not less than 70% of Al₂O₃, corundum with an aluminium oxide content of 98.4% with a 2-7 mm fraction and a fraction of less than 0.05 mm, as well as synthetic molten aluminium chromium spinel with Cr₂O₃ - 15-25 and Al₂O₃ - 75-85 fractions of 0.5-1.5 mm at the following ratio of components, wt %: corundum with the fraction of 2-7 mm 40, corundum with the fraction of less than 0.05 mm 20, high-alumina calcium aluminate cement 10, synthetic molten aluminium chromium spinel 30.

EFFECT: increased strength of products and improved resistance to iron scale.

1 cl