Claims
- 1. A refractory material for the reduction of coal slag penetration comprising an aggregate and a matrix comprising a mixture of chromium oxide, an inorganic oxide and a phosphate, wherein the matrix contains at least about sixty weight percent of chromium oxide.
- 2. A refractory material of claim 1 wherein the matrix further comprises aluminum oxide.
- 3. A refractory material of claim 1 wherein the matrix further comprises ZrO2.
- 4. The refractory material of claim 1 wherein the refractory contains at least seventy weight percent chromium oxide.
- 5. The refractory material of claim 1 wherein the phosphate is an inorganic phosphate.
- 6. The refractory material of claim 1 wherein the phosphate is formed by the reaction of chromium oxide and the inorganic oxides with a phosphorus source, wherein the phosphorous source is selected from the group of phosphoric acid and P2O5.
- 7. The refractory material of claim 1 wherein the matrix contains from about one weight percent to about ten weight percent phosphates.
- 8. The refractory material of claim 1 wherein the chromium oxide is sintered.
- 9. The refractory material of claim 1 wherein the matrix contains less than about 0.1 weight percent of a halogen.
- 10. The refractory material of claim 1 wherein the phosphate contains less that 0.1 weight percent of a halogen.
- 11. A process for manufacturing a refractory material for reduction of coal slag penetration comprisingproviding an aggregate; blending the aggregate with a matrix comprising a mixture of chromium oxide, inorganic oxides and a phosphate, to form a green refractory, wherein the matrix contains at least sixty weight percent of chromium oxide; forming the green refractory into a shape; and curing and firing the shape of green refractory to form an aggregate and a binder of chromium oxide and alumina phosphate.
- 12. The process for manufacturing refractory material of claim 11 wherein the phosphate is inorganic.
- 13. The process for manufacturing refractory material of claim 11 wherein the phosphate is formed by the reaction of chromium oxide and the inorganic oxide with a phosphorus souse, wherein the phosphorous source is selected from the group of phosphoric acid and P2O5.
- 14. The process for manufacturing refractory material of claim 11 wherein the matrix contains from about one weight percent to about ten weight percent phosphate.
- 15. The process for manufacturing refractory material of claim 11 wherein the chromium oxide is sintered.
- 16. The process for manufacturing refractory material of claim 11 wherein the matrix contain less than about 0.1 weight percent of a halogen.
- 17. The process for manufacturing refractory material of claim 11 wherein the phosphate contains less that 0.1 weight percent of a halogen.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
The US Government has rights in this invention due to the employer/employee relationship between the Government and the inventors.
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