What are the raw materials for aluminum production?

Cryolite (Na3AlF6) and alumina (Al2O3).

1. The main principle is the Hall-Elu aluminum electrolysis method: using pure alumina as raw material to make aluminum by electrolysis, because pure alumina has a high melting point (about 2045 ° C), it is difficult to melt, so molten aluminum is used in industry. Cryolite (Na3AlF6) is used as a flux, so that alumina is dissolved in liquid cryolite at about 1000 ° C to become a melt of cryolite and alumina.

2. Aluminum ore mining - alumina production - electrolytic aluminum smelting - aluminum processing and production.

3. Ore mainly composed of gibbsite, boehmite or diaspore. So far, all the bauxite resources available for alumina production in my country are diaspore-type bauxite.

4. The content of alumina in bauxite varies greatly, the low is only about 30%, and the high can reach more than 70%. In addition to alumina, the main impurities contained in bauxite are silicon oxide, iron oxide and titanium oxide. In addition, it also contains a small or trace amount of calcium and magnesium carbonate, potassium, sodium, vanadium, chromium, zinc, phosphorus, gallium, scandium, sulfur and other elemental compounds and organic compounds.