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Open AccessArticle

The Separation of Aluminum and Stainless-Steel Scraps Using Vibrating Mixed-Size Ball Bed

1
Department of Energy & Resources Engineering, Korea Maritime and Ocean University (KMOU), 727, Taejong-ro, Yeongdo-gu, Busan 49112, Korea
2
Metal Extraction and Recycling Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India
3
School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
*
Author to whom correspondence should be addressed.
Metals 2020, 10(7), 868; https://doi.org/10.3390/met10070868
Received: 30 April 2020 / Revised: 21 June 2020 / Accepted: 29 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Separation and Leaching for Metals Recovery)
Dry gravity separation using a vibrating zirconia ball bed is proposed in this study to separate aluminum (Al) and stainless steel (STS) scraps obtained from spent hard disk drive recycling. The effects of zirconia ball sizes and vibrating power (vibration amplitude) on the separation efficiency of Al and STS scraps were investigated. The zirconia balls moved down at the center of the vessel and rose with the wall during the vibration test. Although more STS scraps sunk than Al scraps did, the separation efficiency was not maintained because Al scraps also sunk along with balls’ movement. The separation efficiency increased to 86.6% using 1-mm zirconia balls with a 2.5-mm vibration amplitude at 4 min, but it decreased rapidly by ball moving. Therefore, when a ball bed of mixed sizes (2:1 ratio of 1 and 3 mm) was used and arranged, whereby the 3-mm zirconia balls were above the 1-mm ball bed, the separation efficiency increased to 100% for more than 2 min. This dramatic improvement was because the 3-mm ball bed acted as a barrier to prevent sunken STS scraps from rising, and Al scrap cannot sink through the 3-mm ball bed. These results indicate that the separation of Al and STS scraps could be achieved successfully using the dry gravity separation method. View Full-Text
Keywords: aluminum scrap; stainless steel scrap; zirconia ball; dry gravity separation aluminum scrap; stainless steel scrap; zirconia ball; dry gravity separation
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MDPI and ACS Style

Na, H.; Yoo, K.; Jha, M.K.; Tabelin, C.B. The Separation of Aluminum and Stainless-Steel Scraps Using Vibrating Mixed-Size Ball Bed. Metals 2020, 10, 868.

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