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

G. Liu*, T. Ichinose, S. Owada

*この研究の対応する著者

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトル26th International Mineral Processing Congress, IMPC 2012
ホスト出版物のサブタイトルInnovative Processing for Sustainable Growth - Conference Proceedings
ページ2966-2979
ページ数14
出版ステータスPublished - 2012 12 1
イベント26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - New Delhi, India
継続期間: 2012 9 242012 9 28

出版物シリーズ

名前26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings

Conference

Conference26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth
国/地域India
CityNew Delhi
Period12/9/2412/9/28

ASJC Scopus subject areas

  • 地球化学および岩石学
  • 地盤工学および土木地質学

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