Tin
Ore - Cassiterite.
The ore is crushed washed and roasted before being smelted in a blast furnace or a
reverbetory furnace. The tin is then poured into slabs.
Refined by electrolysis and because melting is affected by impurities the temperature is
controlled.
Zinc
Ore - zinc blonde.
The ore is crushed and then concentrated by floatation before smelting takes place in a
blast furnace. The zinc is removed as a vapour condensed when it is in contact with molten
lead. Pure forms are obtained by electrolysis.
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