Thermodynamic analysis of separation of alloying elements in recycling of end-of-life titanium products

X. Lu, T. Hiraki, K. Nakajima, O. Takeda, K. Matsuabe, H. M. Zhu, Shinichiro Nakamura, T. Nagasaka

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    The separation and control of undesired elements are key to recycling scrap or end-of-life (EoL) metal products, as the quality of regenerated metals is often impaired by contamination from the alloying elements in the scrap. However, little is known of their removability or controllability because they are normally absent in the production of primary metal from natural ore. Here, the distribution ratios of 31 kinds of alloying element among the metal, slag, and gas phases in the re-melting of EoL titanium products were quantitatively discussed. Our results clarified that the typical titanium alloying elements - Al, Fe, and V - are essentially uncontrollable in re-melted titanium by oxidation or evaporation. This suggests that the mixing of commercially pure titanium (CP-Ti) and other titanium alloys should be avoided. Hence, the development of new technologies to separate alloying elements from titanium scraps for sustainable titanium recycling is highly anticipated.

    Original languageEnglish
    Pages (from-to)135-141
    Number of pages7
    JournalSeparation and Purification Technology
    Volume89
    DOIs
    Publication statusPublished - 2012 Mar 22

    Fingerprint

    Alloying elements
    Titanium
    Recycling
    Thermodynamics
    Metals
    Controllability
    Titanium alloys
    Slags
    Ores
    Evaporation
    Melting
    Contamination
    Gases
    Oxidation

    Keywords

    • Alloying element
    • EoL product
    • Refining
    • Thermodynamics
    • Titanium scrap

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Filtration and Separation

    Cite this

    Thermodynamic analysis of separation of alloying elements in recycling of end-of-life titanium products. / Lu, X.; Hiraki, T.; Nakajima, K.; Takeda, O.; Matsuabe, K.; Zhu, H. M.; Nakamura, Shinichiro; Nagasaka, T.

    In: Separation and Purification Technology, Vol. 89, 22.03.2012, p. 135-141.

    Research output: Contribution to journalArticle

    Lu, X. ; Hiraki, T. ; Nakajima, K. ; Takeda, O. ; Matsuabe, K. ; Zhu, H. M. ; Nakamura, Shinichiro ; Nagasaka, T. / Thermodynamic analysis of separation of alloying elements in recycling of end-of-life titanium products. In: Separation and Purification Technology. 2012 ; Vol. 89. pp. 135-141.
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