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A few metals are found 'native', that is as the metal and only need separating from the surrounding materials, e.g. gold and silver. Most metals have to be chemically extracted from whatever compounds we can find. Iron is often found as its oxide and is extracted by heating with coke and limestone in a blast furnace. Sodium is found as sodium chloride and we obtain it by electrolysis of the melt. The method used depends on what will work and what it costs. Methods include displacement by carbon (coke), displacement by another metal, and electrolysis.

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