Abstract
Eight filtration tests have been done at Hydro Aluminium’s reference centre at Sunndal. Two different grades of CFF (Ceramic Foam Filter) and two different grits of BPF (Bonded Particle Filter) from Pyrotek were tested. The alloy composition was the same for each test. The inclusion content in the melt was measured with LiMCA II and PoDFA upstream and downstream the filter. Selected filters have been cut and analysed with image analysis after use.
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Notes
- 1.
This is true for data where there is a large difference between them. In the cases where there are more inclusions after the filter than before, the assumption is wrong. On the other hand, then the removal efficiency is negative.
- 2.
For trial number 2, 3 and 4 the time lag was calculated to about 5 min. For test number 6, about 10 min, and number 5 and 9 about 22 min. The time lag for test number 7 and 8 was not calculated due to missing process data.
- 3.
Note that this curve fitting is performed non-linearly. Microsoft Excel does NOT use non-linear curve fitting in its exponential trendline function.
References
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https://www.yumpu.com/en/document/read/14174895/bonded-particle-filter-pyrotek
https://www.pyrotek.com/DeliverFile/a034040e3f80680e72155174343c87ea
U. Tundal et.al: Drain Free Filtration (DFF) – A New CFF Technology. Light Metals 2019, pp 1097–1104
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Acknowledgements
This research was carried out as part of the Research Council of Norway (RCN) funded BIA Project (No. 269634/O20) BEST. The project includes the partners: Hydro Aluminium AS, Alcoa Norway ANS, Hydro Aluminium AS, Gränges AB, HYCAST AS, NTNU, and SINTEF. In addition, the authors would like to acknowledge all the personnel at Hydro Aluminium’s reference centre at Sunndal Norway for their assistance in the trials.
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Syvertsen, M. et al. (2020). Evaluation of CFF and BPF in Pilot Scale Filtration Tests. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_130
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DOI: https://doi.org/10.1007/978-3-030-36408-3_130
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