Extraction of metals

Common metal ores

Extraction of metals What is an ore deposit? Most metals react with other elements to form ores which occur naturally on earth. An ore is a rock from which useful metals can be extracted.

Extraction of metals Figure: Stages involved in extracting metal from their ores.

What about Aluminium? Extraction of bauxite: Negative terminal: A l 3+ (l) + 3e  A l (l) Positive terminal: O 2- (l)  O 2 (g) + 4e Overall process: 2 A l 2 O 3  4 A l (l) + 3O 2 (g)

Why recycle metals? Metals are finite resources. In other words, the amounts of the various metals in the earth are limited. Figure shows how long it will take for the reserves of common metals to run out.

Recycling aluminium cans

Aspects of recycling
Group work
Form groups of five each.
Discuss the benefits and disadvantages of recycling.
Each group will be assigned to touch on either the social, economic or environmental aspects of recycling.
Present your findings at the end of discussions.

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Extraction of metals

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