alutec
metal innovations GmbH & Co. KG
Ferdinand-von-Steinbeis-Ring 40
D-75447 Sternenfels
Tel.: +49 (0) 7045 - 96 25-0
Fax: +49 (0) 7045 - 96 25-20
info@alutec-online.de
Member since 2014

HOW IS ALUMINIUM PRODUCED

With deposits totalling 8.1% of the earth's crust, aluminium is the third most common element. However, it is found not as metal but rather always in the form of its chemical compound, bauxite.

Bauxite is turned into alumina in the so-called Bayer process. 4 tonnes of bauxite produce approx. 2 tonnes of alumina. This is then broken down into the constituent elements oxygen and aluminium by means of smelting electrolysis.

To do this, the alumina is dissolved into melted cryolite and a continuous current is passed through this molten metal at a temperature of around 1000 degrees Celsius. The oxygen separates to the anode and the metallic aluminium to the cathode and liquid aluminium is thus obtained. In 2010, international production of primary aluminium (aluminium obtained directly from aluminium oxide) amounted to over 402.470 tonnes, and production of secondary aluminium (produced from aluminium scrap) to approx. 611.130 tonnes.