Treatment with sodium salts
The way Harris is based on the fact that arsenic, antimony and tin have a greater affinity for oxygen than lead. The essence of this method lies in the impact of nitrate at a temperature of from 400 to 420 °C in molten lead. The tin, antimony and arsenic are oxidized. These oxides when added to a melt of NaOH dissolved, forming an alkaline water. It is injected sodium chloride to decrease the melting temperature and facilitate further extraction of metals. At the end of the extraction of arsenic, tin and antimony from a mixture of NaCl and NaOH are regenerated and recycled in the process for processing the following portions of the lead. This method allows you to with smaller losses more pure metal — lead and precious metals
This method is practiced very widely. Is in the handling of lead with zinc, which is sparingly soluble in lead, not engaging with him in the interaction. Silver and gold, the content of which is up to 3 g. per kilogram in draft the lead, in contrast, interact with the zinc, forming a refractory intermetallic compound AgZn3 and AuZn3, practically insoluble in lead. These compounds as the most lungs, float to the surface in the form of silver zinc foam.
Removal of lead bismuth
The lead is processed in a liquid bath deviationsin a suitable agent is an alkali or alkaline earth metal. As a result, the surface of the slag bath is formed, which consists of vismuradov alkali metal, usually called a slag of devolatization. In addition, it contains significant amounts of lead.
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