Abstract
A comparison is made of the characteristics of dross formed on lines that make rolled products with anti-corrosion coatings. Two methods of recycling dross to rid it of harmful impurities are examined. In distillation sublimation, an increase in temperature to 1280°C helps maximize the amount of zinc that is transferred from the dross to the storage container. In this case, 70–85% of the zinc is recovered from the dross. The resulting melt contains 99.5% zinc, 0.03% iron, and 0.04% aluminum. Up to 70% of the metallic zinc in dross is recovered when the dross is dissolved in an aluminum melt containing 10–25% aluminum. The use of ammonium chloride increases the amount of iron removed from the secondary zinc and shortens the recycling operation.
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Tekhnologiya BIEK: Inform. Bull.
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Yu. A. Kabanov, V. V. Pol'shikov, V. D. Petrov, and R. A. Mukaev also participated in this study.
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Translated from Metallurg, No. 7, pp. 60–61, July, 2005.