https://www.alcircle.com/news/top-five-alumina-refineries-in-the-...

https://www.alcircle.com/news/top-five-alumina-refineries-in-the-world-by-capacity-39754

So this is where the biggest refineries are in the world. Note that 5 of these are in Australia.
the Kwinana refinery (WA),
the Wagerup refinery (WA),
the Yarwun refinery (Qld),
the Worsley alumina refinery (WA),
the Pinjarra refinery (WA).

Australia is a major refiner and exporter of aluminium already, in spite of our high energy prices.