The production of aluminium trihydrate and aluminium oxide is based on the Bayer Process. Austrian Karl Josef Bayer received patents in 1887 and 1892 for his process to extract aluminium hydroxide from bauxite using caustic soda. The Bayer process has four distinct stages: Digestion, Clarification, Precipitation and Calcination.
The Bayer Process at our AOS facility is outlined in the diagram below. Click on the numbers on the photograph for more information.
The operation process is outlined below: