Héroult

Definition

Héroult refers to the Héroult process, an electrolytic method used to extract aluminum from its oxide, alumina. The process involves dissolving alumina in molten cryolite and then using electrolysis to separate pure aluminum.

5 Must Know Facts For Your Next Test

1. The Héroult process is also known as the Hall-Héroult process, named after its inventors Charles Martin Hall and Paul Héroult.
2. It is the primary industrial method for producing aluminum and accounts for nearly all of the world's aluminum production.
3. The electrolyte used in the Héroult process is a mixture of molten cryolite ($Na_3AlF_6$) and alumina ($Al_2O_3$).
4. The process operates at temperatures around 950°C (1742°F) to maintain the cryolite in a molten state.
5. Electricity is passed through carbon electrodes, causing aluminum ions to migrate to the cathode where they are reduced to form pure aluminum metal.

Related terms

Electrolysis:

A chemical process that uses an electric current to drive a non-spontaneous reaction.

Cryolite:

$Na_3AlF_6$, a mineral used as a solvent for alumina in the electrolytic production of aluminum.

Cathode:

The electrode at which reduction occurs during electrolysis, attracting cations.