Fire refining zinc refining distillation plant are prepared using refined cadmium. In the process of refined zinc rectification, a high cadmium zinc containing 15% to 30% or 5.6% to 20.8% of cadmium is produced from the cadmium column. The extraction of cadmium from such high cadmium zinc is generally carried out by using a rectification column to separate high boiling point impurities to obtain crude cadmium, and then NaOH and NaNO3 are used for alkaline refining to remove residual zinc, and the pure cadmium is produced.
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