Question

How is crude zinc purified?

Answer 1

1. Crude zinc, also known as zinc spelter, is purified mainly by fractional distillation. Impurities such as cadmium and iron, which have different boiling points, are separated during the process.
2. Zinc is first vaporized by heating the crude zinc, and then the zinc vapors are condensed in separate chambers.
3. This process exploits the difference in boiling points to isolate pure zinc from impurities.
4. Fractional distillation effectively removes volatile impurities, producing high purity zinc suitable for industrial use.