Question

what is bayer's process ​

Answer 1

Explanation:

The Bayer process was developed and patented by Karl Josef Bayer in Austria in 1888 and essentially involves digesting crushed bauxite in strong sodium hydroxide solutions at temperatures up to 240°C. Most of the alumina is dissolved leaving an insoluble residue known as “red mud” which mainly comprises iron oxides and silica and is removed by filtration. The particular concentration of sodium hydroxide as well as the temperature and pressure of the operation are optimized according to the nature of the bauxite ore, notably the respective proportions of the different forms of alumina (α, β, or γ). This first stage of the Bayer process can be expressed by the equation:

Al2O3⋅xH2O+2NaOH→2NaAlO2+(x+1)H2O.

Answer 2

The process used in the refining of bauxite to alumina