| 摘要 |
<p>525,376. Induction furnaces. PHELPS DODGE CORPORATION. Feb. 20, 1939, No. 5594. Convention date, March 3, 1938. [Class 39 (iii)] [Also in Group II] Mixtures of metal compounds, for example, fume deposits containing tin, lead, zinc, antimony, arsenic &c. are treated, if desired after preliminary treatment for the removal of sulphur, arsenic and antimony, for the separation of the metals by subjecting the mixture to selective reduction, e.g., by hydrogen to reduce one or more of the compounds, e.g., tin and lead, to metal without reducing one or more others, e.g. zinc, maintaining the mixture above the melting point of the reduced metal and below the melting point of the unreduced compounds, and subjecting the mixture to pressure to express the molten metal. The mixture of metals obtained may be separated by fractional distillation under reduced pressure, for example, in a highfrequency furnace 14 fitted with a water-cooled coil 16, condenser 21, and receiver 22, the molten charge being admitted and the residue discharged through tubes 27, 28, and the whole furnace and condenser being enclosed in an exhausted chamber 25.</p> |
