Concentration of PGMs from automobile catalyst by combining surface grinding and quenching

Gangfeng Liu, Ayumu Tokumaru, Shuji Owada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Spent automobile catalyst is an important secondary resource of PGMs (platinum group metals). The present recovery technologies, including pyro- and hydro-metallurgical processes, are energy-consuming. Automobile catalyst is usually composed of cordierite phase as the substrate covered by the alumina phase which contains PGMs, so the concentration of PGMs could be achieved by separating the alumina phase from cordierite phase using energy saving physical methods. In this paper, according to the structural characteristics of the catalyst, jaw crusher, crushing roll and attritor surface grind were used to concentrate and recover the coat layer into the fine fractions. In order to improve the recovery of coat layer, the heating-quenching process was carried out before the above mentioned crushing. The heating-quenching process produced micro-cracks at alumina/cordierite interface and in the alumina phase because of thermal-stress which was generated by high temperature gradient in the transient thermal conduction. The paper also made a mathematical consideration and FEM (Finite Element Method) simulation to clarify the fracture generation mechanism in the quenching process.

    Original languageEnglish
    Title of host publicationEuropean Metallurgical Conference, EMC 2013
    Pages235-254
    Number of pages20
    Publication statusPublished - 2013
    Event7th European Metallurgical Conference, EMC 2013 - Weimar
    Duration: 2013 Jun 232013 Jun 26

    Other

    Other7th European Metallurgical Conference, EMC 2013
    CityWeimar
    Period13/6/2313/6/26

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    Keywords

    • Automobile catalyst
    • FEM
    • PGM
    • Quenching
    • Surface grinding

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Liu, G., Tokumaru, A., & Owada, S. (2013). Concentration of PGMs from automobile catalyst by combining surface grinding and quenching. In European Metallurgical Conference, EMC 2013 (pp. 235-254)