Impact of Rotor Material Wear on the Aluminum Refining Process
Abstract
:1. Introduction
2. Research Study and the Object
3. Research Results and Discussion
4. Conclusions
- −
- There is a certain amount of moisture in the new rotor, which contributes to re-gasification; as the rotor wear increases, the degree of degassing of the metal bath increases, and thus, the porosity of the obtained cast samples decreases;
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- For the A1 impeller made of classic graphite impregnated with refractory material, the longest service life was observed: about 1100 refining cycles;
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- The A2 impeller, made of fine-grained graphite, also impregnated with refractory material, has a slightly shorter service life than the A1 impeller; the impeller survived about 900 refining cycles;
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- The worst impeller in terms of service life turned out to be the A3 impeller (SiC sprayed graphite); its wear is observed after less than 350 refining cycles, which means that there is no recommendation for further use.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Composition, wt % | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Si | Fe | Cu | Mn | Mg | Cr | Ni | Zn | Pb | Sn | Ti | Al |
8.551 | 0.943 | 2.301 | 0.312 | 0.202 | 0.063 | 0.066 | 0.930 | 0.057 | 0.021 | 0.041 | 86.48 |
Parameter of Refining Process | Unit | |
---|---|---|
Refining time | 180 | s |
Rotary impeller speed | 350 | rpm |
Flow rate of gas | 17 | dm3⋅min−1 |
Working height | 200 | mm |
Designation | Characteristics of Materials | Parameters of Graphite Materials | ||||
---|---|---|---|---|---|---|
Graphite Type | Impregnation | SiC Spraying | Density, g·cm−3 | Flexural Strength, MPa | Porosity, % | |
A1 | Classic graphite | Yes | No | 1.67–1.74 | 12.0–16.6 | 20.0–24.0 |
A2 | Fine-grained graphite | Yes | No | 1.72–1.75 | 15.5–19.5 | 15.0 |
A3 | Classic graphite | No | Yes | 1.67–1.74 | 12.0–16.6 | 20.0–24.0 |
Experiment Series | Impeller Wear | The Beginnings of the Cycle | ||
---|---|---|---|---|
A1 | A2 | A3 | ||
1/VT | 0% | 0× | 0× | 0× |
2/VT | 25% | 287× | 366× | 343× |
3/VT | 50% | 500× | 607× | |
4/VT | 75% | 798× | 875× | |
5/VT | 100% | 1112× |
Percentage Level of Rotor Wear, % | ||||
---|---|---|---|---|
0% | 25% | 50% | 75% | 100% |
Rotor A1 | ||||
Rotor A2 | ||||
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Rotor A3 | ||||
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Prášil, T.; Socha, L.; Gryc, K.; Svizelová, J.; Saternus, M.; Merder, T.; Pieprzyca, J.; Gráf, M. Impact of Rotor Material Wear on the Aluminum Refining Process. Materials 2022, 15, 4425. https://doi.org/10.3390/ma15134425
Prášil T, Socha L, Gryc K, Svizelová J, Saternus M, Merder T, Pieprzyca J, Gráf M. Impact of Rotor Material Wear on the Aluminum Refining Process. Materials. 2022; 15(13):4425. https://doi.org/10.3390/ma15134425
Chicago/Turabian StylePrášil, Tomáš, Ladislav Socha, Karel Gryc, Jana Svizelová, Mariola Saternus, Tomasz Merder, Jacek Pieprzyca, and Martin Gráf. 2022. "Impact of Rotor Material Wear on the Aluminum Refining Process" Materials 15, no. 13: 4425. https://doi.org/10.3390/ma15134425