Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/39B8BED6-D198-49F4-86E3-E2E77EA4C10F | - |
| Γλώσσα | en | - |
| Μέγεθος | 6 pages | en |
| Τίτλος | Developments in gold recovery equipment and their use in Greece | en |
| Δημιουργός | Manoutsoglou Emmanouil | en |
| Δημιουργός | Μανουτσογλου Εμμανουηλ | el |
| Δημιουργός | Stamboliadis, Elias | en |
| Δημιουργός | Pantelaki ,O | en |
| Περίληψη | Gravity separation techniques were used in the early years to extract native metal nuggets and flakes from placer gold deposits. This was relatively easy for visible metal grains. As the size of the grain becomes smaller traditional gravity separation techniques become inadequate to recover native gold. Cyanidation was invented as a solution to the problem. According to it, gold and other precious metals are dissolved in water by sodium cyanide. The result was a drastic increase of world gold production but at the same time environmental issues were raised. In Greece gold mining has become equivalent with the absolute destruction of the environment and is under extinction. In the last years a new type of gravity equipment have been produced which create a gravitational field up to 200 G and can separate gold from gangue minerals at sizes below 50 μm. The strong gravitational field is created by centrifugal forces and the separation occurs in a fluidized bed, formed by water flow. Accumulations of finely disseminated native gold are found in the sedimentary sequence of the Flysch of the Ionian Zone. The main gold minerals are gold and electrum present as free metal flakes and micro nuggets in the size range between 5-250 μm. Test work, using the Falcon SB40 centrifugal concentrator, at the Department of Mineral Resources Engineering at the Technical University of Crete, has shown that this particular type of gold ore can be processed by gravitational methods that require no reagents and are environmentally safe. | en |
| Τύπος | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Τύπος | Conference Full Paper | en |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2015-10-31 | - |
| Ημερομηνία Δημοσίευσης | 2003 | - |
| Θεματική Κατηγορία | Gold recovery | en |
| Βιβλιογραφική Αναφορά | E. Stamboliadis , E. Manutsoglu , O. Pantelaki ," Developments in gold recovery equipment and their use in Greece," in Conference Sustainable Development Indicators in the Mineral Industries ,2003,pp. 329-334. | en |
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