FIELD: metallurgy.
SUBSTANCE: invention relates to a fire-proof ceramic product, which can be used for fire-proof lining of metallurgical industry aggregates, glass-making furnaces and furnaces of non-metallurgical industry. The fire-proof ceramic product has MgO fraction of at least 75% by weight, as well as ceramic bond, while it has a sulfur fraction in the range from 0.01 to 0.20% by weight and has a SiO2 fraction of less than 1.5%. The product is manufactured by sintering a charge, in which the main component contains one or several of the following raw materials based on magnesium oxide: sintered magnesium oxide, fused magnesium oxide, sintered calcined dolomite or fused calcined dolomite, as well as one or several components containing aluminum oxide, aluminum-magnesium spinel, sintered corundum, fused corundum, calcined alumina, galaxite, hercynite or pleonast. The specified sulfur amount is provided by introducing sulfur-containing compounds into the charge, including crushing the lining of concrete furnaces.
EFFECT: obtaining products resistant to hydration without worsening fire-proof properties.
14 cl, 2 ex
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