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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 764 pages |
| ISBN: | 978-0-9879917-5-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Copper, Gold, Silver Dissolution On Halide Chlorine Acid Leaching
Edgar Blanco1;1FLSMIDTH, Midvale, United States;
Type of Paper: Regular
Id Paper: 397
Topic: 14
Abstract:
Traditional hydrometallurgical process for oxide ore is using sulfuric acid for copper extraction with poor dissolution of noble metals. A Halide Chlorine leachant at acidic conditions are tested to extract copper, gold and silver.Dissolution is enhanced in copper at pH 1.8-2.0 and for noble metals with fresh blend formation of chlorine and NO3 ions to form aqua regia insitu. The chlorine ions controlled the process reaction process for gold and silver dissolution. The rate of noble metals dissolution is function of chemical reaction on solid-liquid interphase and mass transfer phases of determinate reaction area. The silver rate dissolution is increased at chlorine concentration. Variables such as mineralogical composition, concentration of reagents, dissolved oxygen, reaction time, pH and temperature were evaluated.