. When refined from Bauxite, alumina looks like white powder quite similar to the table salt. Alumina is produced from bauxite. Bauxite is the type of ore that that is mined from the upper surface of soil in the tropical and sub-tropical region. Later the Bauxite powder must go to the process called Bayer process. Bayer process is carried out in 4 steps. First, after the bauxite is refined, washed and dried then it is dissolve with the caustic soda at high temperature. Next, the mixture is filtered to remove the impurities, called “red mud,” which is properly discarded. The remaining alumina solution is transferred to tall tanks called precipitators. In the precipitator tank, the hot solution starts to cool and aluminum hydroxide seeds, very small particles, are added. The aluminum hydroxide seeds stimulate the precipitation of solid aluminum hydroxide crystals. The aluminum hydroxide settles at the bottom of the tank and is removed. Finally, the aluminum hydroxide is washed of any remaining caustic soda and heated to remove excess water.