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| Number | Title | Issue Date |
| 6800113 | Equipment for distribution and feeding of charge and fuel in shaft furnaces of rectangular cross section The present invention refers to an equipment for feeding and distributing charge and fuel in furnaces of rectangular cross section, comprising movable feeding tubes to distribute along the longitudinal section and the cross section of the furnace, both a charge comp... | 10/05/2004 |
| 6235081 | Process for the production of spongy metal A method for producing a sponge metal from metal ore or iron ore which comprises reacting said metal ore or iron ore in a reduction zone with a CO-- and H2 -containing, reducing feed gas source which has been compressed, and after said reaction... | 05/22/2001 |
| 6224650 | Apparatus for manufacturing molten iron by using calcination furnace, and manufacturing method therefor An apparatus for manufacturing molten iron by using a calcination furnace, and a manufacturing method therefor are disclosed. A high temperature reducing gas (1000 to 1100° C.) from a melter gasifier is used as a calcination heat in a calcination furnace... | 05/01/2001 |
| 4747872 | Process and apparatus for producing high purity iron Improved process and apparatus for the reduction of iron oxides employing a solid reducing agent. Particulate iron oxides are mixed with particles of the reducing agent and are subjected to high temperatures within a vessel made of refractory material whi... | 05/31/1988 |
| 4384886 | Process for zinc removal from oxide-containing iron sources For removing zinc from oxide-containing iron sources, the iron source is in form of lump having a minimum grain size of 5 mm supplied together with lumpy reducing agents to a shaft-like muffle furnace being adapted to be gas-tightly closed. The muffle fur... | 05/24/1983 |
| 4242125 | Carbothermic process for producing sponge iron and the improved vertical retort system used in said process Carbothermic process for reducing iron ore in an externally heated vertical retort characterized in that the charging mixture is pre-heated while descent within a first zone of the retort and with a substantially constant thermal charge; a second and prog... | 12/30/1980 |
| 4189313 | Carbothermic process A carbothermic process and apparatus for converting iron ore directly to sponge iron in a vertical retort is described. A reaction charge of iron ore, reducing agent, and additives if employed is charged to a vertical retort having in reciprocal cooperati... | 02/19/1980 |
