For 10 points, name this doubly-eponymous industrial process that was discovered independently by an American and a Frenchman and is used in the production of aluminum.
The bath employed by this process is stirred by magnetohydrodynamic flow and generally uses a mixture of sodium, calcium, and fluorides of the desired element. The more efficient method of this process uses solid carbon anodes and is called pre-baked. This process is often preceded by the Bayer process and originally used a cryolite bath in which alumina, now replaced by bauxite, was dissolved. For 10 points, name this doubly-eponymous industrial process that was discovered independently by an American and a Frenchman and is used in the production of aluminum.
The bath employed by this process is stirred by magnetohydrodynamic flow and generally uses a mixture of sodium, calcium, and fluorides of the desired element.
{Hall}-{Heroult} process [prompt on partial answer]