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Gold extraction from an oxide ore in iodine-iodide solutions

Baghalha, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1149/1.3684792
  3. Abstract:
  4. Two types of gold ores were subjected to iodide/iodine leaching at room temperature. The effects of three factors, including ore type (a carbonaceous and an oxide gold ores), iodide/iodine concentration, and the presence of oxygen in solution on gold leaching performance were investigated. The carbonaceous ore showed only 20% gold extraction into the solution; since gold-iodide complexes would readily adsorb on organic matter. In contrast, gold extraction from the oxide ore in a solution containing 20 g/L iodide and 4 g/L iodine reached 77% in 6 h and 89% in 24 h. With iodate as the oxidant, no gold could be leached in 48 hours. When the iodate was partially converted to iodine by adding HCl to the solution, gold leaching was then started. Iodine reactions with the sulfide and ferrous minerals of the oxide ore slowly consumed iodine within 48 hours
  5. Keywords:
  6. Ferrous minerals ; Gold extraction ; Gold leaching ; Gold ores ; Ore-type ; Oxide ore ; Room temperature ; Types of gold ores ; Electrochemistry ; Extraction ; Gold ; Gold compounds ; Iodine ; Leaching ; Ores ; Gold ore treatment
  7. Source: Industrial Electrochemistry and Electrochemical Engineering General Session - 220th ECS Meeting, Boston, MA, 9 October 2011 through 14 October 2011 ; Volume 41, Issue 17 , 2012 , Pages 53-60 ; 19385862 (ISSN) ; 9781607683070 (ISBN)
  8. URL: http://ecst.ecsdl.org/content/41/17/53.abstract