- Chemical Name & Formula: Aluminium Hydroxide (or Tri-hydroxide), Al(OH)3
- Technical or Common Name(s): Alumina Trihydrate (or simply ‘Hydrate’), usually written in oxide notation as Al2O3.3H2O
- The most abundant economic source of alumina. It is also the intermediate product in the refining process.
- Requires the lowest refining temperature, typically 150oC.
- Chemical Name & Formula: Aluminium Hydroxy-oxide, AlOOH
- Technical or Common Name(s): Alumina Monohydrate, usually written in oxide notation as Al2O3.H2O
- Requires higher refining temperatures, typically 240-260oC
- Chemical Formula: AlOOH, but usually written in oxide notation as Al2O3.H2O
- Has the same composition as boehmite but a different crystal form. It does not occur in tropical bauxites but is of importance in Europe & China.
- Requires the highest refining temperatures to process,typically +260oC.
Source: World Bauxite Resources, USGS, CMGroup