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采用锌粉喷吹技术从Pb-Ag合金中除银。所用锌粉粒径分别为3.55,44.4和734.8μm,以氮气为输送气体,通过从顶部插入的一根喷管喷入熔体中。实验结果表明,采用粒径为44.4μm的锌粉时,银的去除率最高,而采用较小粒径的锌粉时去除率最低。X射线衍射分析表明,采用粒径为44.4和734.8μm的锌粉时,生成的渣中存在AgZn相,这与SEM-EDS分析结果相吻合。根据喷吹进入熔体中锌粉的熔化时间和沉降时间,对实验现象进行了解释。
Zinc powder injection technology is used to remove silver from Pb-Ag alloys. The zinc powders used were 3.55, 44.4 and 734.8 μm in diameter, respectively, and were sparged with nitrogen as the carrier gas through a nozzle inserted from the top into the melt. The experimental results show that the removal rate of silver is the highest when the zinc powder with the size of 44.4μm is adopted, while the zinc removal with the smaller size is the lowest. X-ray diffraction analysis showed that the presence of AgZn phase in the resulting slag using zinc powder with particle sizes of 44.4 and 734.8 μm coincides with the SEM-EDS analysis. According to the melt into the melt zinc powder melting time and settling time, the experimental phenomenon was explained.