Question

Recovery of alumina from red mud is the most difficult process during the manufacture of aluminium.

(a) True

(b) False

This question was addressed to me during a job interview.

The origin of the question is Aluminum topic in section Metallurgical Industries of Chemical Technology

Answer 1

Right choice is (a) True

For explanation I would say: Recovery of alumina from red mud discharged from the thickener is the major engineering problem in the manufacture of aluminium. Alternative method is to calcine the mud with lime and soda ash to form sodium aluminate which can be leached.