Magnesia refractories bonded with sulfamic acid
AssigneeMartin Marietta Corporation
InventorsDennis C. Nagle, Myron T. McCall, In H. Kim
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Abstract
Gunning mixes and other magnesia-based refractory compositions are disclosed which include up about to 10% by weight sulfamic acid as a binder. Sulfamic acid reacts readily with periclase grain and, when employed with boric acid and ceramic sintering aids forms an excellent binder system.
Claims14
A refractory composition comprising a dry granular mixture of a magnesia-based refractory grain and up to about 10% by weight of sulfamic acid as a binder.
A refractory gunning composition for use in the repair of metallurgical furnace linings comprising a dry granular mixture of magnesia-based refractory grain and between about 0.5 and about 10% by weight of sulfamic acid as a binder.
A refractory composition comprising a dry granular mixture of a magnesia-based refractory grain and up to about 5% by weight of sulfamic acid as a binder.
A refractory gunning composition for use in the repair of metallurgical furnace linings comprising a dry granular mixture of magnesia-based refractory grain and between about 0.5 and about 5% by weight of sulfamic acid as a binder.
A dry, granular, refractory gunning mix for use in the repair of metallurgical furnace linings, comprising about 2.0% by weight sulfamic acid, about 0.5% by weight boric acid, from about 0.5 to about 1.0% by weight Cr.sub.2 O.sub.3, from 0 about to 0.5% by weight Ca(NO.sub.3).sub.2, the balance being magnesia-based refractory grain.
Dependencies are inferred from the claim text.