真空分离法分离Sn-Zn合金粉

Separation of Tin and Zinc from Tin-Zinc Alloy Powders by Vacuum Distillation

采用真空蒸馏法从锡锌合金粉中分离锡和锌,考察了还原剂、蒸馏温度、蒸馏时间对锡、锌直收率的影响.结果表明,采用活性炭作还原剂,在蒸馏温度1373 K、蒸馏时间30 min、原料质量100 g、活性炭6 g的条件下,锡和锌的直收率分别为82.40%和83.62%,残留物中锡纯度为99.31%,挥发物中锌纯度为99.58%.真空条件下,锡富集在液相残留物中,锌富集在气相挥发物中.锡锌合金粉中SnO_2与ZnO反应,产物为锡酸锌.真空条件下还原SnO_2和ZnO比标准状态下更具优越性.

Effects of reducing agent, distillation temperature and distillation time on recycling tin and zinc from Sn-Zn alloy powders were investigated by using a vacuum distillation method. The results demonstrated that the direct yield of tin and zinc can respectively reach to 82.40% and 83.62%, the purity of tin in the residue was 99.31% and the purity of zinc in volatile was 99.58% after using activated carbon as reducing agent under the optimized conditions with distillation temperature of 1373 K, distillation time of 30 rain, 100 g raw material and 6 g activated carbon. Under vacuum condition, zinc and tin enriched in gas phase and liquid phase, respectively. Tin oxide and zinc oxide reacted in the Sn-Zn alloy, and the zinc stannate was the product, the reduction of tin oxide and zinc oxide were superior under vacuum conditions than that under standard state.