Explain hall heroult process
Answers
The Hall-Herault process is an electrolytic process, whereby the widely available aluminium oxide (bauxite) is electrolysed. Cryolyte (sodium hexafluroaluminate) is added to lower the melting point and this reduces energy costs. Calcium fluoride is not deliberately added to the mix, but is created from calcium oxide which is present as an impurity in the bauxite feed. Bauxite also typically contains silica and iron (III) oxide as impurities, and these have to be removed before electrolysis since aluminium, once prepared, cannot be freed from other metals (which will be deposited on electrolysis) by refining it. This said some calcium is co-deposited. Being an active metal, I guess this is easily removed afterwards.
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