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| Number | Title | Issue Date |
| 6149859 | Gasification plant for direct reduction reactors The present invention is an integrated process and apparatus for supplying at least a portion of the reducing gas feedstock to a reduction reactor, such as a reactor for the direct reduction of iron, wherein the reducing gas contacts a feed material at a ... | 11/21/2000 |
| 5494263 | System for solid material charging into vertical reactors by electronic control of the exhaust gases This invention relates to a method to provide a system for solid material arging into vertical reactors by electronic control of the exhaust gases, a unique process applied for charging into vertical reactors, cupolas, ferrous and non-ferrous blast furnac... | 02/27/1996 |
| 5407179 | Fluidized bed direct steelmaking plant A fluidized bed direct steelmaking plant for reducing raw iron ore fines and directly producing an iron product in a virtually closed gas system comprises an ore feed assembly, a multi-stage reactor assembly with a compacting assembly, a gasifier/smelter ... | 04/18/1995 |
| 5082251 | Plant and process for fluidized bed reduction of ore An improved FIOR processing plant and method for reducing raw iron ore fines into a 90+% metallized briquette product utilizing a multi-stage fluidized bed reactor in which the reducing and fluidizing gases are the products of partial combustion of methan... | 01/21/1992 |
| 5028034 | Continuous feed shaft retort appartus for recovery of non-ferrous metals A method and apparatus for recovering primary metals from pyrometallurgical process dust, in which a vertical shaft retort, situated in a furnace or afterburner associated with a pyrometallurgical apparatus, such as an inclined rotary reduction smelter, a... | 07/02/1991 |
| 4958808 | Apparatus for producing sponge iron or pig iron A process for producing sponge iron from iron ore is described, which is reduced to sponge iron in a reduction shaft furnace by means of a hot reduction gas. For this purpose reduction gas at a temperature in the range 750° to 900° is introduced into sh... | 09/25/1990 |
| 4788917 | Shaft furnace bypass system A method and apparatus for removing undesired compounds such as alkali compounds from a shaft furnace such as a blast furnace. The process and apparatus includes providing a plurality of intermediate exhaust conduits or manifolds within the shaft furnace ... | 12/06/1988 |
| 4643110 | Direct fuel-fired furnace arrangement for the recovery of gallium and germanium from coal fly ash A furnace arrangement utilizes a single vertically disposed shaft furnace incorporating the features of pellet drying and hardening, oxidizing heat-up, reducing roast and gas separation. The upper portion of the furnace dries and hardens "green" pellets w... | 02/17/1987 |
| 4544138 | Discharge of top gases from blast furnaces or the like During the charging of a blast furnace with a new raw material, gas with a high dust content enters and pressurizes the storage bin. This pressurized gas is fed to one end of a temporary storage chamber in the form of an elongated tube having a discharge ... | 10/01/1985 |
| 4488905 | Method of recovering volatile metals from material containing metal oxides A method of reducing and recovering volatile metal from metal oxides comprising the steps of injecting metal oxide-containing material into a shaft reactor, simultaneously injecting reducing agent into said reactor, continuously maintaining said reactor s... | 12/18/1984 |
| 4260139 | Refining of metals This invention relates to refining platinum group metal concentrates and the separation therefrom of silver and of the majority of base metals with which they naturally occur. In more detail the process comprises the steps of: (a) contacting a solid parti... | 04/07/1981 |
| 4128231 | Indirectly fired vertical shaft furnace An indirectly fired vertical shaft furnace suitable for use as a volatilizing furnace for recovering metals from their ores, a crop drying or roasting furnace or a heating furnace is comprised of two concentric cylindrical metal shells each of which is cl... | 12/05/1978 |
| 3933342 | Ore processing furnace An ore processing furnace particularly adapted for processing ores at generally low temperatures ranging between 600° Fahrenheit and 1200° Fahrenheit: said furnace comprising an ore containing and processing chamber structure surrounded by a fire box an... | 01/20/1976 |
