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Metal Elements In the Earth’s Crust Metals account for 25% of the earth’s crust Metalurgy The science and technology of retrieving metal elements and making them useful. Extraction….. Modification…… Alloying…….. Extraction Few pure metals are found in nature. They must be extracted from minerals Minerals Solid and pure Occur in the crust Contain metalic elements Name often ends with “ite” Extraction Metal is extracted from mineral ore in two main stages crush it (physical) and burn it (chemical) crush it (physical) and electrocute it (chemical) crush it (physical) and disolve it (chemical) Burn = pyrometallurgy Electrocute = electrometallurgy Dissolve = hydrometallurgy Extraction Extraction is simply a form of decomposition… Modification Altering the properties of a pure metal without a chemical change Alloying Properties of a metal can be changed by mixing another element with it.
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