Quality- and dilution losses in the recycling of ferrous materials from end-of-life passenger cars

Input-output analysis under explicit consideration of scrap quality

Shinichiro Nakamura, Yasushi Kondo, Kazuyo Matsubae, Kenichi Nakajima, Tomohiro Tasaki, Tetsuya Nagasaka

    Research output: Contribution to journalArticle

    47 Citations (Scopus)

    Abstract

    Metals can in theory be infinitely recycled in a closed-loop without any degradation in quality. In reality, however, open-loop recycling is more typical for metal scrap recovered from end-of-life (EoL) products because mixing of different metal species results in scrap quality that no longer matches the originals. Further losses occur when meeting the quality requirement of the target product requires dilution of the secondary material by adding high purity materials. Standard LCA usually does not address these losses. This paper presents a novel approach to quantifying quality- and dilution losses, by means of hybrid input-output analysis. We focus on the losses associated with the recycling of ferrous materials from end-of-life vehicle (ELV) due to the mixing of copper, a typical contaminant in steel recycling. Given the quality of scrap in terms of copper density, the model determines the ratio by which scrap needs to be diluted in an electric arc furnace (EAF), and the amount of demand for EAF steel including those quantities needed for dilution. Application to a high-resolution Japanese IO table supplemented with data on ferrous materials including different grades of scrap indicates that a nationwide avoidance of these losses could result in a significant reduction of CO2 emissions.

    Original languageEnglish
    Pages (from-to)9266-9273
    Number of pages8
    JournalEnvironmental Science and Technology
    Volume46
    Issue number17
    DOIs
    Publication statusPublished - 2012 Sep 4

    Fingerprint

    input-output analysis
    Passenger cars
    Dilution
    Recycling
    automobile
    dilution
    recycling
    Steel
    Electric arcs
    Copper
    Furnaces
    steel
    Metals
    Scrap metal
    copper
    metal
    loss
    material
    Impurities
    Degradation

    ASJC Scopus subject areas

    • Chemistry(all)
    • Environmental Chemistry

    Cite this

    Quality- and dilution losses in the recycling of ferrous materials from end-of-life passenger cars : Input-output analysis under explicit consideration of scrap quality. / Nakamura, Shinichiro; Kondo, Yasushi; Matsubae, Kazuyo; Nakajima, Kenichi; Tasaki, Tomohiro; Nagasaka, Tetsuya.

    In: Environmental Science and Technology, Vol. 46, No. 17, 04.09.2012, p. 9266-9273.

    Research output: Contribution to journalArticle

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