Polling (metallurgy)

Polling (metallurgy)

Polling in metallurgy is the process of refining a crude metal which has its own oxide as impurity. The molten metal is stirred with logs of green wood in a tank. The heat from the molten metal decomposes the wood which liberates hydrocarbon gases which reduce the oxide impurity into the metal.This method is generally used for refining copper and tin.


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