| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Engineering -- From Ideas to Practice: An EPD Symposium in Honor of Jiann-Yang Hwang
|
| Presentation Title |
The Formation Mechanism of the Third Phase in Nickel Electrolyte |
| Author(s) |
Ailiang Chen, Jiale Mao, Guanwen Luo, Sujun Lu , Peng Zhang , Yutian Ma , Shengli Chen , Zuojuan Du , Jinxin Qiao, Bowen Li |
| On-Site Speaker (Planned) |
Ailiang Chen |
| Abstract Scope |
The third phase is generated inevitably, but affects the quality of the electric nickel product in the nickel metallurgical process. This paper studies the formation and the prevention mechanism of the third phase in the raffinate. The analysis of Fe-S-Si-H2O system shows that iron exists in the form of Fe3+ at the pH value ≤ 2.17. With pH increasing, Fe3+ begins to hydrolyze to form FeOH2+. FeOH2+ continues to hydrolyze to form Fe(OH)2+ at the pH value≥4.72. Fe3+ is reduced and hydrolyzed to FeOH+ when the potential ≤0.21V. The precipitation of Fe2SiO4 is reduced at the potential ≤0.35V and 5≤ pH value ≤13.2 when the solution contains silicon dioxide. The analysis of the third phase shows that it is mainly iron hydroxide, iron polynuclear hydroxyl complex ions and Fe-SO4 complexes. It provides theoretical guidance for the formation of the third phase in the extraction multiphase system. This also plays a positive role in the production of high-quality nickel products. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Phase Transformations, Other |