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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) |
Application Of Mixed Chloride Technology For The Recovery Of TiO2, Base Metals And PGM
V.I. Lakshmanan1; Ram Sridhar1; Raja Roy1;1PROCESS RESEARCH ORTECH INC., Mississauga, Canada;
Type of Paper: Regular
Id Paper: 264
Topic: 14
Abstract:
Process Research ORTECH has developed a unique hydrometallurgical process based on a mixed chloride lixiviant. This mixed chloride technology has been used to develop process flowsheets for the extraction of base metals and PGMs from sulfide ores and high purity titanium dioxide from ilmenite ores. For base metals and PGMs recovery, base metals are recovered during a first stage leach and elemental sulfur is liberated from hydrogen sulfide formed during this leaching stage. During second stage leach, precious metals are recovered using proven separation technologies. Some of the advantages of the process are the recovery of elemental sulfur from sulfide sulfur, recycle of the chloride lixiviant thereby eliminating effluent treatment steps and use of excess energy from the Claus reactor for the pyrohydrolysis step. For the synthesis of high purity titanium dioxide, ilmenite ore is first leached in a mixed chloride lixiviant at atmospheric pressure. The solution purification is carried out using solvent extraction in two stages. In the first stage solvent extraction, iron removal is carried out and in the second stage titanium is extracted. The strip liquor obtained from the second stage solvent extraction containing titanium is used for the production of high purity TiO2 by thermal precipitation. The barren solution is used for reagent recovery and the regenerated leach liquor is recycled.