Distillation

Distillation

The tin department treats the crude solder alloy coming from the foundry. At the same time it can treat all other types of tin bearing raw materials coming from other sources.

In the first stage of this process, the greater part of the lead in the alloys is evaporated through vacuum distillation. The lead vapour is condensed into a soft lead and cast into 25 kg ingots. During the second distillation stage the remaining lead is removed to produce pure tin ingots with a lead content below 100  ppm, possibly even down to 50 or below 25 ppm of lead.