A basic study on development of a swell-peeling method in UBC recycling system

Kazuhisa Fujisawa, Takayuki Kogishi, Kenji Oosumi, Takashi Nakamura

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)

Abstract

Recycling of used aluminum beverage cans(UBCs) is one of the important issues for aluminum manufacturer presently. The direct re-melting of UBCs shows two problems. One is a reduction in molten aluminum recovery and the other is a contamination of other metals such as Ti and Fe from paints. Both problems are caused by paints coated on the surfaces of aluminum cans. Removal technique of the paints, therefore, has been required. Although roasting and shot blast techniques have been developed, both were not successful in removing the paints effectively. A swell-peeling method has been applied to remove them using a methylene chloride solution with acids and it works very well. Small laboratory scale tests have been carried out to develop the commercial process and clarify the mechanism of the swell-peeling method in the present study. When the surface area of UBC is more than 10 cm2, peeling time is independent of the surface area, about 60 seconds, because swelling phenomenon is controlled by the penetration of the liquid through the fine pits on the surface of the paint. This is good for a commercial process. Peeling takes place when the swelling force generated by methylene chloride exceeds the adhesion force between the film and the surface of aluminum, that is weakened by the coexisting acid, especially halogenated acetic acid.

Original languageEnglish
Pages835-844
Number of pages10
DOIs
Publication statusPublished - 2000
Event4th International Symposium on Recycling of Metals and Engineered Materials - , United States
Duration: 2000 Oct 222000 Oct 25

Other

Other4th International Symposium on Recycling of Metals and Engineered Materials
Country/TerritoryUnited States
Period00/10/2200/10/25

ASJC Scopus subject areas

  • Filtration and Separation

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