2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 10: Mineral & Secondary Battery
| Editors: | Kongoli F, Silva AC, Arol AI, Kumar V, Aifantis K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-33-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Kinetics of Oxidized Roasting of Egyptian Galena
Aly Abdel-Rehim1;1ALEXANDRIA UNIVERSITY, Alexandria, Egypt;
Type of Paper: Regular
Id Paper: 292
Topic: 5
Abstract:
The main industrial method of processing of galena is its oxidized roasting in air atmosphere, followed by reduction smelting of lead oxide in presence of coal. The present work illustrates a study of processing of Egyptian galena by oxidized roasting, its thermal behaviour and its kinetics over the temperature range 400-950oC.
The DTA curve of roasting of galena shows its beginning of oxidation at 460oC, followed by the reaction at 585oC between galena and the lead sulphate resulted with the formation of basic lead sulphate. The intensive oxidation of galena is represented by the large and sharp exothermic double maximum peak at 750 and 780oC.
The standard free energy (i„Go) and equilibrium constant (K) of the reaction of oxidation of galena to lead oxide at 850oC are - 165.088 kcal mol-1 and 1.34. 1032, respectively. These values reflect the irreversibility of the reaction.
The kinetic study of the oxidized roasting of galena is governed by the structure and condition of the surface coating, which is composed of lead sulphate and basic sulphate and some lead oxide. The experimental data reveal that the rate of oxidation of galena is low at 400-500oC. This is due to the formation of a compact thick product layer and the rate of the reaction is controlled by diffusion through this product layer.
At 600oC and higher temperatures, the product layer around galena particles during its oxidation is friable and porous. The rate is not affected by this coating and the oxidized roasting of galena is controlled by the chemical reaction occurring at the surface of galena particles.
Keywords: Egyptian galena, roasting, kinetics
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