In the Smelting terminology a Pot is the object which holds the Cathode blocks, Anode Blocks, Alumina, Coke and Flouride to create a Chemical reaction to produce Aluminum. The pot holds all the material and by passing electricity thru the cathode blocks and Anode Blocks creates a chemical reaction to produce the Aluminum.
This will explain it a little better.
https://en.wikipedia.org/wiki/Aluminium_smelting
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