Method for producing high-temperature cement in the blast furnace

A high alumina cement is made from the slag removed during a smelting process for iron ores (see Division C7) which comprises thermally agglomerating e.g. sintering or pelletizing a mixture of iron ore and/or iron scale, aluminium bearing material such as a ferruginous bauxite and a low silica flux such as calcite mudstone, and charging the agglomerated mixture with coke having 6% maximum silica into a blast furnace and smelting.ALSO:Iron and high-alumina slag for use as a cement (see Division C1) are produced by thermally agglomerating a mixture of an iron bearing material, consisting of iron ore and/or iron scale and preferably having a SiO2 content not greater than 7%, aluminium bearing material, preferably ferruginous bauxite, and a low silica flux such as calcite mudstone preferably containing at most 2% SiO2, to drive off the combined H2O and CO2, then charging a blast furnace with a burden, of which the agglomerated mixture comprises at least 75%, and coke having 6% maximum SiO2, and smelting.