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| Rapid Dissolution of Pt-Rh Alloys by Chlorination in Aqueous Solution |
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Received:May 12, 2021
Revised:May 30, 2021
Accepted:June 01, 2021
Published Online:August 27, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.09.010 |
| KeyWord:platinum; rhodium; recovery; hydrometallurgy; aqua regia; chlorine; ionic liquid |
| Author | Institution |
| QIN Zhao |
重庆大学化学化工学院 |
| WANG Dan |
重庆大学化学化工学院 |
| ZHU Zu-tao |
重庆大学化学化工学院 |
| ZHANG Chao-gang |
重庆大学化学化工学院 |
| WU Bao-an |
国家仪表功能材料工程技术研究中心重庆材料研究院有限公司 |
| TANG Hui-yi |
国家仪表功能材料工程技术研究中心重庆材料研究院有限公司 |
| LUO Feng-lan |
国家仪表功能材料工程技术研究中心重庆材料研究院有限公司 |
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| Abstract: |
| In China, aqua regia, a process of wet process, is mainly used to recover platinum group metals (PGMs). However, due to its disadvantages of longer dissolution time and higher dissolution temperature, this process needs to be further optimized. Using Pt-Rh alloys powder (containing about 10% Rh and 90% Pt) as raw material, chlorine gas was added into traditional solution system of aqua regia in a self-made reactor to improve oxidizing ability of Pt-Rh alloys. By adding iron based ionic liquid to enrich reaction products of PtCl62- and RhCl63-, rapid dissolution of Pt-Rh alloy at low temperature was realized. Effects of aqua regia composition, L/S, chlorine consumption, reaction temperature and ionic liquid dosage on dissolution rate of Pt-Rh alloys were investigated. The results show that solution time of Pt-Rh alloys is shortened to 1.52 h under the optimal reaction conditions. Purity of platinum and rhodium is more than 99.95%, and recoveries are 99.2% and 98.6%, respectively. Therefore, dissolution efficiency rises by about 78.29% after traditional process was improved. This study has great potential for industrial application. |
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