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| Number | Title | Issue Date |
| 5571475 | Reducing and smelting furnace having filter layer In a process and an apparatus for the production of liquid metal (4) from fine-grain metal oxide particles, the particles, together with hot reducing gas, are blown against a heated bulk material filter layer (9) of lump coal and/or ceramic pieces, a subs... | 11/05/1996 |
| 4898712 | Two-stage ferrosilicon smelting process The present invention relates to a process for the production of ferrosilicon in a closed two-stage reduction furnace. In the present invention, carbon monoxide released as a result of the smelting process, in the first stage of the furnace, is used to pr... | 02/06/1990 |
| 4877449 | Vertical shaft melting furnace and method of melting A vertical shaft melting furnace wherein meltable solids are charged to the upper region of a bed supported only by a fluid cooled support grid having openings smaller than the average diameter of the charged solids wherein submerged combustion is maintai... | 10/31/1989 |
| 4324764 | Apparatus for continuous leaching of ores A process for the continuous leaching of ores and an apparatus for practising this continuous leaching process are disclosed. According to this process, a plurality of unit layers composed of a pulverized uranium ore or other ore are continuously laminate... | 04/13/1982 |
| 4212452 | Apparatus for the direct reduction of iron ore A method and apparatus for the direct reduction of iron ore are disclosed. A mixture of iron ore, solid carbonaceous fuel and, if sulfur is present, calcined limestone or dolomite, are used. The carbonaceous material can be cellulosic material (wood waste... | 07/15/1980 |
| 4205455 | Method and an apparatus for steam curing agglomerates Steam curable agglomerates of particulate material are cured by passing steam at elevated temperature and pressure through a bed of such agglomerates in an autoclave. The flow direction of the steam through the bed is periodically reversed, at least durin... | 06/03/1980 |
