Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding

Gangfeng Liu, Shuji Owada, Ayumu Tokumaru

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

    Abstract

    Several million spent catalytic converters are disposed annually worldwide and each containing about 0.5-1g of platinum and 1-2g of all the platinum group metals (PGMs), then, it is fairly significant to recover PGMs from the spent automobile catalyst. The PGMs' recovery is a proven technology, including pyro- and hydrometallurgical methods, and the highest recovery can achieve approx. 98 wt.% by acid-leaching method, but these recycling technology seems to be too highly energy-consuming. Since PGMs are distributed only in coat layer in spent catalyst, it is of great significance to enrich the coat layer with some physical methods as a pretreatment. In this paper, according to the double-deck structure of the catalyst and the different properties of the two main compositions, alumina-ceria phase of coat layer and cordierite phase of substrate, the concentration of the coat layer was investigated by combining three kinds of physical separation technologies, heating-quenching, crushing and surface grinding. In the first stage, thermal stress could generate between the two phases by thermal expansion difference, to produce fractures in the thinnest part of coat layer and micro-cracks in coat layer and at the interface of coat layer and cordierite substrate. The second stage of crushing, by jaw and roll crushers, could break dominantly the coat layer and the third stage of surface grinding, carried out by attritor, promoted further separation and concentration of coat layer from the substrate. We also improved the attritor grinding by adding a new lift-arm to the cell for achieving better mobility of sample particles in the selective surface grinding.

    Original languageEnglish
    Title of host publicationIMPC 2014 - 27th International Mineral Processing Congress
    PublisherGecamin
    Publication statusPublished - 2014
    Event27th International Mineral Processing Congress, IMPC 2014 - Santiago, Chile
    Duration: 2014 Oct 202014 Oct 24

    Other

    Other27th International Mineral Processing Congress, IMPC 2014
    CountryChile
    CitySantiago
    Period14/10/2014/10/24

    Fingerprint

    Grinding (comminution)
    Crushing
    crushing
    Platinum
    grinding
    platinum
    Automobiles
    automobile
    Quenching
    Metals
    catalyst
    Catalysts
    metal
    Substrates
    Metal recovery
    Crushers
    Catalytic converters
    cordierite
    Aluminum Oxide
    Cerium compounds

    ASJC Scopus subject areas

    • Earth-Surface Processes
    • Geochemistry and Petrology
    • Geotechnical Engineering and Engineering Geology
    • Mechanical Engineering

    Cite this

    Liu, G., Owada, S., & Tokumaru, A. (2014). Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding. In IMPC 2014 - 27th International Mineral Processing Congress Gecamin.

    Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding. / Liu, Gangfeng; Owada, Shuji; Tokumaru, Ayumu.

    IMPC 2014 - 27th International Mineral Processing Congress. Gecamin, 2014.

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

    Liu, G, Owada, S & Tokumaru, A 2014, Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding. in IMPC 2014 - 27th International Mineral Processing Congress. Gecamin, 27th International Mineral Processing Congress, IMPC 2014, Santiago, Chile, 14/10/20.
    Liu G, Owada S, Tokumaru A. Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding. In IMPC 2014 - 27th International Mineral Processing Congress. Gecamin. 2014
    Liu, Gangfeng ; Owada, Shuji ; Tokumaru, Ayumu. / Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding. IMPC 2014 - 27th International Mineral Processing Congress. Gecamin, 2014.
    @inproceedings{3f210e54fd4444ff91ce5c89483d1731,
    title = "Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding",
    abstract = "Several million spent catalytic converters are disposed annually worldwide and each containing about 0.5-1g of platinum and 1-2g of all the platinum group metals (PGMs), then, it is fairly significant to recover PGMs from the spent automobile catalyst. The PGMs' recovery is a proven technology, including pyro- and hydrometallurgical methods, and the highest recovery can achieve approx. 98 wt.{\%} by acid-leaching method, but these recycling technology seems to be too highly energy-consuming. Since PGMs are distributed only in coat layer in spent catalyst, it is of great significance to enrich the coat layer with some physical methods as a pretreatment. In this paper, according to the double-deck structure of the catalyst and the different properties of the two main compositions, alumina-ceria phase of coat layer and cordierite phase of substrate, the concentration of the coat layer was investigated by combining three kinds of physical separation technologies, heating-quenching, crushing and surface grinding. In the first stage, thermal stress could generate between the two phases by thermal expansion difference, to produce fractures in the thinnest part of coat layer and micro-cracks in coat layer and at the interface of coat layer and cordierite substrate. The second stage of crushing, by jaw and roll crushers, could break dominantly the coat layer and the third stage of surface grinding, carried out by attritor, promoted further separation and concentration of coat layer from the substrate. We also improved the attritor grinding by adding a new lift-arm to the cell for achieving better mobility of sample particles in the selective surface grinding.",
    author = "Gangfeng Liu and Shuji Owada and Ayumu Tokumaru",
    year = "2014",
    language = "English",
    booktitle = "IMPC 2014 - 27th International Mineral Processing Congress",
    publisher = "Gecamin",

    }

    TY - GEN

    T1 - Concentration of PGMs from spent automobile catalyst combined by quenching, crushing and surface grinding

    AU - Liu, Gangfeng

    AU - Owada, Shuji

    AU - Tokumaru, Ayumu

    PY - 2014

    Y1 - 2014

    N2 - Several million spent catalytic converters are disposed annually worldwide and each containing about 0.5-1g of platinum and 1-2g of all the platinum group metals (PGMs), then, it is fairly significant to recover PGMs from the spent automobile catalyst. The PGMs' recovery is a proven technology, including pyro- and hydrometallurgical methods, and the highest recovery can achieve approx. 98 wt.% by acid-leaching method, but these recycling technology seems to be too highly energy-consuming. Since PGMs are distributed only in coat layer in spent catalyst, it is of great significance to enrich the coat layer with some physical methods as a pretreatment. In this paper, according to the double-deck structure of the catalyst and the different properties of the two main compositions, alumina-ceria phase of coat layer and cordierite phase of substrate, the concentration of the coat layer was investigated by combining three kinds of physical separation technologies, heating-quenching, crushing and surface grinding. In the first stage, thermal stress could generate between the two phases by thermal expansion difference, to produce fractures in the thinnest part of coat layer and micro-cracks in coat layer and at the interface of coat layer and cordierite substrate. The second stage of crushing, by jaw and roll crushers, could break dominantly the coat layer and the third stage of surface grinding, carried out by attritor, promoted further separation and concentration of coat layer from the substrate. We also improved the attritor grinding by adding a new lift-arm to the cell for achieving better mobility of sample particles in the selective surface grinding.

    AB - Several million spent catalytic converters are disposed annually worldwide and each containing about 0.5-1g of platinum and 1-2g of all the platinum group metals (PGMs), then, it is fairly significant to recover PGMs from the spent automobile catalyst. The PGMs' recovery is a proven technology, including pyro- and hydrometallurgical methods, and the highest recovery can achieve approx. 98 wt.% by acid-leaching method, but these recycling technology seems to be too highly energy-consuming. Since PGMs are distributed only in coat layer in spent catalyst, it is of great significance to enrich the coat layer with some physical methods as a pretreatment. In this paper, according to the double-deck structure of the catalyst and the different properties of the two main compositions, alumina-ceria phase of coat layer and cordierite phase of substrate, the concentration of the coat layer was investigated by combining three kinds of physical separation technologies, heating-quenching, crushing and surface grinding. In the first stage, thermal stress could generate between the two phases by thermal expansion difference, to produce fractures in the thinnest part of coat layer and micro-cracks in coat layer and at the interface of coat layer and cordierite substrate. The second stage of crushing, by jaw and roll crushers, could break dominantly the coat layer and the third stage of surface grinding, carried out by attritor, promoted further separation and concentration of coat layer from the substrate. We also improved the attritor grinding by adding a new lift-arm to the cell for achieving better mobility of sample particles in the selective surface grinding.

    UR - http://www.scopus.com/inward/record.url?scp=84938900786&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84938900786&partnerID=8YFLogxK

    M3 - Conference contribution

    BT - IMPC 2014 - 27th International Mineral Processing Congress

    PB - Gecamin

    ER -