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This research has been supported by EU-FP7 NANOPYME Project (310516), Ministerio de Economia y Competitividad (MINECO) through ENMA (MAT2014-56955-R), and Regional Government (Comunidad de Madrid): NANO-FRONTMAG (ref. S2013/MIT-2850).

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Rial Rodriguez, JavierAuthor

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February 4, 2020
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Recycling of Strontium Ferrite Waste in a Permanent Magnet Manufacturing Plant

Publicated to:ACS Sustainable Chemistry & Engineering. 5 (4): 3243-3249 - 2017-04-03 5(4), DOI: 10.1021/acssuschemeng.6b03053

Authors: Bollero, Alberto; Rial, Javier; Villanueva, Melek; Golasinski, Karol M.; Seoane, Ana; Almunia, Judit; Altimira, Ricardo;

Affiliations

IMA SL, Ingn Magnet Aplicada, Av Rafael Casanova 114, Barcelona 08100, Spain - Author
IMDEA Nanosci, Div Permanent Magnets & Applicat, C Faraday 9, Madrid 28049, Spain - Author

Abstract

Residues resulting from the manufacture of strontium ferrite magnets have been recycled for further use in magnet fabrication instead of disposal as waste. The quality of the recycled ferrite powder has been tested and compared to that of the new starting ferrite material. The magnetic properties of the recycled powder not only match those of the starting material acquired by the company for the production of magnets but exceed them. A coercivity value 3.5 times larger than that of the new starting ferrite powder, accompanied by a 25% increase in remanence, makes this material a new and improved ferrite product to re-enter the production chain in the factory with an extended applications range. This improvement is proven to be due to tuning of the morphology and microstructure through processing and subsequent heat treatment. The use of processing conditions in the same range as those typically used in the preparation of ferrite powders and magnets, in combination with the superior magnetic quality of the resulting powders, makes this method a suitable path to guarantee sustainability and an efficient use of resources in permanent magnet companies.

Keywords

FerritesPermanent magnetsRecoveryRecyclingSustainability

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal ACS Sustainable Chemistry & Engineering due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2017, it was in position 10/137, thus managing to position itself as a Q1 (Primer Cuartil), in the category Engineering, Chemical. Notably, the journal is positioned above the 90th percentile.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 3.38, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-04, the following number of citations:

  • WoS: 8
  • Scopus: 12

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-04:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 50.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 50 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 21.
  • The number of mentions in news outlets: 3 (Altmetric).