Alumina refractory
AssigneeN L Industries, Inc.
InventorEdward L. Manigault
Life of this patent
Estimating the term…
Abstract
A new refractory material has been prepared comprising 70 to 96% alumina, 3 to 20% iron chromite ore, and 1 to 10% of a phosphate compound, calculated as P.sub.2 O.sub.5. The new refractory material is prepared by admixing 70% to 96% alumina, 3% to 20% iron chromite ore, and 1% to 10% of a phosphate compound selected from the group consisting of aluminium phosphate and phosphoric acid, said phosphate compound calculated at P.sub.2 O.sub.5, and firing the mixture to form the refractory product. This new refractory material has a low porosity, high bulk density and modulus of rupture.
Claims7
A refractory composition comprising from 70% to 96% alumina, from 3% to 20% iron chromite ore, and from 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P.sub.2 O.sub.5, all of the percentages expressed on a weight basis.
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P.sub.2 O.sub.5, all of the percentages expressed on a weight basis, forming said mixture into a ceramic body and firing said body at temperature from 350.degree.C. to 1650.degree.C. from 2 to 8 hours to form said refractory composition.
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P.sub.2 O.sub.5, all of the percentages expressed on a weight basis, from 65% to 94% of said alumina having a size from -1/4 inch to +325 mesh, the remaining alumina being -325 mesh, forming said mixture into a ceramic body and firing said body at temperature from 350.degree.C. to 1650.degree.C. for 2 to 8 hours to form said refractory composition.
A ceramic composition useful as a plastic mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, 1% to 4% bentonite, 0% to 12% water and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P.sub.2 O.sub.5, all of the percentages expressed on a weight basis.
A ramming mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P.sub.2 O.sub.5, all of the percentages expressed on a weight basis.
Dependencies are inferred from the claim text.