废铝合金真空蒸馏脱锌的研究

Removal of Zinc from Aluminum Alloy Scrap by Vacuum Distillation

首先分析了用真空蒸馏的方法脱除废铝合金中金属Zn的可行性。对二种含Zn质量分数为10%,12.25%的废铝合金进行了真空蒸馏脱除锌的实验。最终的实验结果与理论分析是紧密一致的。本文利用真空蒸馏法脱除含锌废铝中的金属Zn,解决了废铝脱锌难的问题,且对环境友好,不会造成二次污染。

The feasibility of removing zinc from the aluminum alloy scarp, with zinc contents of 10% （wt） and 12.25% ,by vacuum distillation was studied. The impacts of the vacuum distillation conditions, such as the distillation temperature and time, pressure, and contents of magnesium, nickel, manganese and iron impurities, on evaporation rate of zinc were experimentally evaluated and theoretically calculated. The preliminary results show that the distillation tempera- ture and time, zinc content, and thickness of the scrap pile, strongly affect the zinc distillation rate. For instance, for the Zn-10% scrap, high evaporation rate and low residue of zinc were achieved at a temperature above 823 K;whereas similar results for the Zn-2.25% scrap were obtained at a temperature over 1023 K,possibly becanse of solid phase formation. Good agreement was found between the calculated and measured results.