Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process

G. Liu, T. Ichinose, Shuji Owada

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

    1 Citation (Scopus)

    Abstract

    Spent automobile catalyst is an important secondary resource of PGMs (platinum group metals) and the recovery is significant. Various methods of recovery technology have been reported and applied in practical production, including pyro- and hydrometallurgical processes. Since the grade of PGMs in the catalysts is so low, approximately 0.5 wt. %, the present recycling technologies require high energy-consumption, it is of great significance to enrich the PGMs with some energy saving physical separation methods as a pretreatment. Automobile catalyst is usually composed of cordierite phase as a substrate and alumina phase, with PGMs, which covers the cordierite phase. We adopted the quenching pretreatment, one method of thermal shock, to generate micro-cracks between the two phases and separate the alumina phase from cordierite. Quenching was carried out by heating the catalysts in an electric furnace of different temperatures followed by rapid soaking into cold water. It was found that the phase boundary between alumina and cordierite was broken in the quenching and selective separation (detachment) of alumina from the cordierite could be achieved in the following surface grinding. The effect of quenching was checked by microscopic observation, hardness measurement, and chemical analysis. This paper figures out the stress formula of the quenching process, which is largely connected with layer thickness and temperature gradient by using an FEM (Finite Element Method) simulation and clarifies the mechanism of crack generation in the quenching process.

    Original languageEnglish
    Title of host publication26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings
    Pages2966-2979
    Number of pages14
    Publication statusPublished - 2012
    Event26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - New Delhi
    Duration: 2012 Sep 242012 Sep 28

    Other

    Other26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth
    CityNew Delhi
    Period12/9/2412/9/28

    Fingerprint

    Bearings (structural)
    Aluminum Oxide
    cordierite
    Platinum
    platinum
    aluminum oxide
    Automobiles
    automobile
    Quenching
    Alumina
    Metals
    catalyst
    heating
    Heating
    Catalysts
    metal
    Cracks
    microcrack
    Recovery
    Electric furnaces

    Keywords

    • Automobile catalyst
    • FEM
    • PGM
    • Quenching process

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geotechnical Engineering and Engineering Geology

    Cite this

    Liu, G., Ichinose, T., & Owada, S. (2012). Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process. In 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings (pp. 2966-2979)

    Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process. / Liu, G.; Ichinose, T.; Owada, Shuji.

    26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings. 2012. p. 2966-2979.

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

    Liu, G, Ichinose, T & Owada, S 2012, Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process. in 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings. pp. 2966-2979, 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth, New Delhi, 12/9/24.
    Liu G, Ichinose T, Owada S. Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process. In 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings. 2012. p. 2966-2979
    Liu, G. ; Ichinose, T. ; Owada, Shuji. / Separation of PGMs bearing alumina phase from cordierite in spent automobile catalyst by heating quenching process. 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings. 2012. pp. 2966-2979
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