- Hardness and strength
- Low heat retention and high melting point
- For production of aluminum by the Hall–Héroult process
- Other industrial uses include abrasives, fillers in plastics and catalyst support for industrial catalysts
- To turn bauxite into alumina, we grind the ore and mix it with lime and caustic soda, pump this mix into high-pressure containers, and heat it. The aluminum oxide we’re after is dissolved by the caustic soda, then precipitated out of this solution, washed, and heated to drive off water. What’s left is the sugar-like white powder called alumina, or aluminum oxide (Al2O3).