Semi-Solid Remelting of Magnesium Chips
Compact and loose magnesium chips were processed by means of remelting. The remelting was successfully performed using the new method of semi-solid melting, without the addition of flux, at temperatures between 580°C and 600°C. In this temperature range, the exothermic reaction between magnesium and the oxygen present in the surrounding atmosphere is avoided; in addition, the oxygen layer of the chips is stripped off by the particles of the semi-solid melt. Results show that more than 95% of the magnesium chips can be recovered as metal. Experiments were performed on different scales to obtain production parameters for the recycling process. Larger particle sizes of magnesium chips can be remelted faster than smaller ones. The ability to remelt at temperatures in the semi-solid region of alloys demonstrates the possibility of recovering virtually all of the metal from the chips.
The authors thank the Bundesministerium für Bildung und Forschung (BMBF) within the KMU-Innovativ “Ressourcen und Energieeffizienz” program for financial support of the project “HOVEMAS: Innovatives Verfahren zur hochwertigen Verwertung von Magnesiumspänen” (FK: 033R115B).
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