Effect of impurity elements on displacement reaction between molten Al and SiO2 designed for utilization of Al scrap

Noboru Yoshikawa, Gaku Kitahara, Hideaki Yamaguchi, Shoji Taniguchi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

It is difficult to purify Al scrap by means of the general refining process, because of iron impurity, so they are diluted with new Al metal and reused. In the author's previous report, attempts were made to utilize the Al scrap for fabrication of the composite materials by displacement reaction between molten scrap and vitreous silica (SiO2). In this study, influence of impurities (Fe, Cu, Mg, Si, Sn) on the displacement reaction rate was investigated, the elements of which are present in the Al scraps derived from window frames. It was shown that the reaction rate was not decreased very much by addition of the elements within the composition range of the Al scrap. However, Mg addition to Al decreased the rate more than the other elements. A composite body consisting of Al and Al2O3 phases is formed by displacement reaction between molten pure Al and SiO2, but when molten scrap is reacted with SiO2, Mg was contained in Al 2O3 phase, and the other impurities were contained in the metal (Al) phase. Fe and Cu have interaction with Si (by-product of the reaction), resulted in the higher Si content in the metal phase. On the contrary, this tendency was not obvious in Al-Sn reaction case.

Original languageEnglish
Pages (from-to)857-861
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume68
Issue number10
DOIs
Publication statusPublished - 2004 Oct

Keywords

  • Alumina
  • Aluminum
  • Composite material
  • Reaction
  • Reaction rate
  • Recycling
  • Scrap

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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