| Description |
vi, 69 leaves : illustrations ; 28 cm |
| Summary |
"The successful large scale commercial application of high vacuum for high temperature metallurgical operations is a comparatively new development. The use of Pidgeon and the carbothermic processes for the production of magnesium during the war forced a perfection of both equipments and techniques for high vacuum operations. This opens broadly the way for a great expansion of vacuum metallurgy. Vacuum operation is thus no more a laboratory method - it is a kind of industrial practice. Many metallurgical operations, which cannot be carried out by ordinary processes, are made feasible when conducted in a reduced pressure. typical examples are the Kroll-Schlechten process for the preparation of lithium metal and the vacuum distillation of the reaction products from the Kroll method for producing titanium. Vacuum metallurgy thus gives us an entire new field for development ... The present work is undertaken to determine the effectiveness of various agents for the reduction of zinc sulphide in a vacuum. The method used was to heat the charge, composed of zinc sulphide and various reducing agents in the different series of experiments, in a vacuum furnace for a given time. Analyses were then made on the resulting residues, and sometimes on the condensates. From these analyses, data regarding zinc extraction can be obtained"--Introduction, leaves 1-2. |
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