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Problem 18 - Entrance Test

Magnetic separation is an effective method for concentrating which type of ore?

A. Sulphide ores like zinc blende.B. Carbonate ores like limestone.C. Ores containing magnetic impurities or being magnetic themselves, like haematite with wolframite.D. Light oxide ores like bauxite.

Correct: C

Magnetic separation is used when either the ore itself or the gangue associated with it is magnetic. For example, iron ores like haematite (Fe2O3) or magnetite (Fe3O4) can be separated from non-magnetic gangue, or a magnetic impurity like wolframite can be separated from non-magnetic tin stone (SnO2). The finely crushed ore passes over a magnetic roller, separating magnetic particles from non-magnetic ones.