Chromia-magnesia ramming cement
AssigneeNorton Company
InventorCecil M. Jones
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Abstract
A raw batch for a ramming cement is shown adapted to be fired in place to protect studded boiler tubes and the like. The fired cement includes a major proportion of a particulate chromia-magnesia spinel that is bonded in-situ with a clay phase including kaolinite and montmorillonite components and a reacted chromia and magnesia compound together with sodium hexametaphosphate.
Claims11
A retractory ramming cement consisting essentially of grains of fused crushed chromia-magnesia spinel bonded with an in situ fired bond resulting from heating said grains together with an intimate mixture of clay, fine chromia, fine calcined magnesia and a phosphate binder, and wherein the ratio of fine chromia to fine calcined magnesia is about 3 to about 5 parts by weight of chromia to 1 part by weight of calcined magnesia.
A raw batch refractory cement mix for ramming consisting essentially of grains of fused crushed chromia-magnesia spinel and a mixture adapted to form a bond upon being fired including kaolinite, montmorillonite, fine chromia, fine calcined magnesia and a phosphate binder, and wherein the ratio of fine chromia to fine calcined magnesia is from about 3 to about 5 on a weight basis.
Dependencies are inferred from the claim text.