CD shopping page |
2011-Sustainable Industrial Processing Summit
|
| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 828 pages |
| ISBN: | 978-0-9879917-0-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Environmentally Friendly Technologies For Manufacturing Pure Metals
Aleksandre Kandelaki1; Omar Mikadze1; Jondo Bagdavadze1; Leri Rukhadze1;1F.TAVADZE INSTITUTE OF METALLURGY AND MATERIALS SC, Tbilisi, Georgia;
Type of Paper: Regular
Id Paper: 82
Topic: 4
Abstract:
The present report deals with an alternative way of producing pure metals by their reduction from the respective oxides. In contrast to the conventional methods of metallurgical treatment of ores the production of pure metals is realized using the methods of thermal dissociation of oxides in the atmosphere of ultra-low oxidation potential. The formation of such an environment is possible by using an oxygen pump.The process can be simplified and accelerated by suppression of the oxygen partial pressure in the useful capacity as a result of interaction of alcohol vapor with oxygen. For example, the introduction of 0.2 mg of alcohol in the atmosphere of 1 l-capacity closed air container and its heating to 800oC provides obtaining nitrogen with the oxygen partial pressure of 10-22atm. Increase of the temperature up to 1500oC causes ultra-deep evacuation of oxygen to 1028atm. Such conditions promote dissociation of oxides of almost any kind. A positive aspect is that the thermodynamic equilibrium of partial pressure at a given temperature is set during few seconds.An installation for ultra-deep oxygen evacuation has been constructed and a methodology for conducting experiments was developed. The paper presents the results of complete thermodynamic analysis of the ethanol reduction processes of oxides (CuO, NiO, CoO, Fe2O3 and Cr2O3) in the temperature range 300-1500K.