1. Extraction:
* Mining: The first step is to extract the ore containing the desired metal from the earth.
* Concentration: Ores usually contain only a small percentage of the desired metal. Concentration techniques like flotation or magnetic separation remove impurities.
2. Refining:
* Smelting: The concentrated ore is heated to high temperatures to melt and separate the metal from other elements. This often involves adding fluxes to remove impurities.
* Purification: Further refining steps might include:
* Electrolysis: Passing an electric current through a solution containing the metal to separate it from impurities.
* Refining by fire: Heating the metal in a controlled atmosphere to remove impurities.
* Other techniques: Specific techniques like vacuum melting, zone refining, or fractional crystallization may be used depending on the metal.
3. Shaping and Working:
* Casting: Molten metal is poured into molds to create specific shapes.
* Forging: Heating metal to a high temperature and then hammering or pressing it into shape.
* Rolling: Passing the metal through rollers to flatten it into sheets or bars.
* Extrusion: Pushing the metal through a die to create a specific shape.
* Machining: Using tools to cut, shape, or drill the metal.
Factors affecting workability:
* Purity: A purer metal is typically easier to work with.
* Temperature: Heating the metal can make it more malleable.
* Alloying: Adding other metals can change the strength, hardness, and workability of the metal.
Examples:
* Iron: Iron ore is mined, smelted, and refined into pig iron. Further refining processes produce steel, which is then shaped into various forms.
* Aluminum: Bauxite ore is mined, refined into alumina, and then smelted to produce aluminum.
* Gold: Gold ore is mined, crushed, and then refined through a process called cyanidation.
Remember: The specific steps and techniques used will vary greatly depending on the metal being refined and the desired final product.