Ans. The stages involved in the preliminary
treatment to contrite iron ore are
1.
Washing: - In this method the crushed and finely powdered iron one is
washed with stream of water to remove lighter gangue particles.
2.
Magnetic separation: - This process of concentration of an ore is used, if the given
ore is magnetic. The crushed ore is allowed to fall on the moving belt of a
magnetic separator, the magnetic components of the ore is attracted by the
magnetic roller and forms a heap and the nonmagnetic impurities (gangue) fall
away and form a separate heap. Thus, iron ore i.e. magnetite is enriched by
this process.
