Method of sintering calcium aluminate raw mixes
AssigneeUnited States Steel Corporation
InventorsHubert O. Nickelsen, Joseph E. Kopanda, Felix J. Piasecki
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Abstract
In sintering calcium aluminate raw mixes for use in calcium aluminate cements from 0.5 to 4.0% by weight of SO.sub.3 is added to the mix in the form of CaSO.sub.4 to broaden the sintering range.
Claims4
In the method of sintering a calcium aluminate raw mix including by weight at least 28% by weight of Al.sub.2 O.sub.3, in which a raw mix is converted into a clinker by heating it to a temperature sufficient to remove surface water and water of crystallization, and then rapidly heated to a sintering temperature of at least 50.degree. - 250.degree.F below the melting point of the raw mix, wherein the improvement comprising adding from 0.5 to 4.0% SO.sub.3 by weight to the mix in the form of CaSO.sub.4 to broaden its sintering range.
Dependencies are inferred from the claim text.