Bayer process
Quick Summary
The Bayer process is an industrial method used to produce alumina (aluminum oxide) from bauxite ore. This is a crucial step before aluminum metal can be smelted.
The process involves four main stages:
1. Digestion: Bauxite is ground and mixed with a hot sodium hydroxide solution under heat and pressure. This dissolves the aluminum-containing minerals, forming sodium aluminate.
2. Clarification: Insoluble impurities, known as red mud, are separated from the sodium aluminate solution.
3. Precipitation: Aluminum hydroxide crystals are added to the solution to encourage the separation of more aluminum hydroxide crystals.
4. Calcination: The aluminum hydroxide crystals are heated to high temperatures, driving off water and leaving behind pure alumina.
Alumina is a white powder that is the primary raw material for producing aluminum metal through electrolysis.123
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