Question

The process of converting hydrated alumina into anhydrous alumina is called

• A. roasting
• B. smelting
• C. dressing
• D. calcination

Answer 1

Answer: (D)

calcination

Answer 2

Calcination is the process of converting an ore into its oxide by heating it strongly below its melting point either in absence or limited supply of air. $\underset{\text{Bauxite}}{ {Al_{2}O_{3}\cdot2H_{2}O}}$ ${->[\Delta]}$ $\underset{\text{Alumina}}{ {Al_{2}O_{3}}}$ $+ 2H_2O$