Method of operating an open-hearth furnace
Patent 4347079 Issued on August 31, 1982. Estimated Expiration Date: 
March 12, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 12, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3859078 3861905 Process and immersion lances for introducing oxygen into a metal melt Method for controlling the injection of flux into a steelmaking vessel as a function of pressure differential Patent #: 3999977 InventorAssigneeApplicationNo. 06/243019 filed on 03/12/1981US Classes:75/516, Using gaseous Oxygen in a higher concentration than in ambient air266/214Reverberatory refining vessel, e.g., open hearthExaminersPrimary: Rosenberg, Peter D.Attorney, Agent or FirmInternational ClassesF27B 3/10 (20060101)C21C 5/48 (20060101) C21C 5/00 (20060101) C21C 5/04 (20060101) F27B 3/22 (20060101) AbstractOxygen is blown into an open hearth furnace beneath the surface of the molten metal through a jacketed tuyere, each tuyere angled toward the center of the furnace. A high volume of jacketing coolant is injected through two separate annular passageways around the oxygen to form a large skull around the tuyere. Apparatus is also disclosed for carrying out the process. | |
