Question

. In purification of bauxite by Baeyer's process powder bauxite is mixed with:
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Answer 1

In Baeyer's process, impure bauxite is converted into pure alumina. ... Concentrated sodium hydroxide solution is heated with amphoteric bauxite at a temperature of 150 to 200° C under pressure to get sodium aluminate. Sodium aluminate is then diluted with water at a temperature of 50 to 60° C.

Answer 2

Serpek's method is used for the purification of bauxite if it contains excess amount of silica (SiO2). DETAILS OF THE PROCESS: The powdered bauxite is mixed with carbon and heated up to 1800oC and a current of nitrogen is passed, aluminum nitride is obtained.