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This category covers establishments primarily engaged in mining, milling, or other wise preparing lead ores, zinc ores, or lead-zinc ores
zinc
Yes, the zinc layer helps to preserve the iron sheet from rusting.
Sheradising is a method of coating a metal, usually steel, with zinc. The zinc is transferred from a vapour phase.
A good method is distillation.
add electric current to seperate the zinc from the acid in the compund.
Depending on the method used, it would either be called "zinc plated steel" or "galvanized steel." Use the link below to read more on this method of treating steel to improve its corrosion resistance.
I don't think you've understood the process. Galvanizing is the name of the method by which you apply a surface layer of zinc on to steel or iron, to prevent it from rusting. Applying a surface layer of zinc onto zinc doesn't really change anything.
A good method of separation in this case is distillation.
Ed: Butterd Toast? <:D
It is extracted from Cassiterite, SnO2, which is tin ore.
Andreas Marggraf (1709-1782) A German scientist isolated Zinc from its minerals. He published his findings in "On the method of extracting zinc from its true mineral, calamine" in (1746). Read more about this and its history on the related link below.