What type of ores can be concentrated by magnetic separation method ?

Explanation

The magnetic separation method for concentration is employed when either the ore or the impurities associated with it are magnetic in nature. For example, chromite ` (FeO.Cr_2 O _3 = FeCr_2O_4) ` - an ore of chromium, magnetic ` (Fe_3O _4) ` - an ore of iron and pyrolusite (`MnO _ 2) ` - an ore of maganese being magnetic are separated from non - magnetic silicious gangue by this method. Similarly , tinstone or casiterite (`SnO _2`) being non - magnetic can be separated from magnetic impurities like tungstates of iron and manganese ` (FeWO _ 4 and MnWO _ 4 ) ` which are generally associated with it, by this method.