Production and use of substances GapFill

To produce alumina from its ore, which is called zeolite bauxite rutile crude oil , the Hall–Héroult Bayer electrolysis contact process is used. First the ore is crushed to increase its surface area and this is reacted with hot, concentrated aluminium hydroxide ammonium hydroxide potassium hydroxide sodium hydroxide  under high pressure. This results in dissolution of the ore. The slurry then undergoes condensation filtration diffusion electrolysis  to remove impurities. Subsequently, the solution is cooled and sodium hydroxide platinum aluminium oxide aluminium hydroxide is added to the solution to aid precipitation. Aluminium crystallises and the solution is filtered. Lastly, the product is heated to remove water from the compound and externally – this is known as sedimentation condensation calcination precipitation . 

To extract aluminium from alumina, the electrolysis Hall–Héroult contact Bayer process is used. First, alumina is dissolved in cryolite at 1000 °C, then precipitation sedimentation calcination electrolysis is carried out and the aluminium is produced.