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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 754 pages |
| ISBN: | 978-0-9879917-3-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
The Effect Of Aluminium Chloride Additive On The Efficiency Of Molten Salt Extraction Process For Recovery Of Chromium From Cr2O3
Babak Khalaghi1;1ROYAL INSTITUTE OF TECHNOLOGY, Stockholm, Sweden;
Type of Paper: Regular
Id Paper: 179
Topic: 12
Abstract:
A salt extraction process was applied to chromium oxide to recover metallic chromium. This process consists of two steps: 1. Dissolution of chromium oxide into the molten salt mixture; 2. Electrolysis of salt phase to recover Cr as cathode deposit. In dissolution step Cr2O3 powder was dissolved in a mixture of KCl, LiCl, NaCl and AlCl3 in which aluminium chloride is the main dissolving agent. However, due to high vapour pressure, the yield of AlCl3 is low as a considerable amount of it evaporates before reacting with Cr2O3. Therefore, to increase the yield of AlCl3, in this work an additive containing 30 wt. % AlCl3 was prepared at a low temperature (450-500ᵒC). The effect of replacing pure AlCl3 by this additive was studied in two series of dissolution experiments. Chemical analysis of dissolution samples by ICP-AES shows that using this AlCl3 additive minimises the loss of AlCl3 and the efficiency of the process is significantly increased. After dissolution period the attained salt bath was electrolysed under an applied voltage of 2.8 V. The cathode deposit was subjected to SEM/EDS and XRD analyses, which confirmed the formation of Cr. The results show that molten salt extraction process offers a promising route towards the extraction of metallic chromium from its oxide.