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| Number | Title | Issue Date |
| 5215572 | Process and apparatus for absorption of zinc vapour in molten lead A process and apparatus for absorbing zinc vapour in a molten lead is characterized in that a gas containing zinc vapour is contacted with and then separated form a flowing stream of molten lead in a cyclone.... | 06/01/1993 |
| 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 |
| 4265644 | Condensation of metal vapor A lead-splash condenser for condensing metal vapor from a hot gas stream, comprising a plurality of condensation chambers, spray generating means provided in each condensation chamber, an inlet for passage of a hot gas containing metal vapor to the first ... | 05/05/1981 |
