When do we use a magnetic separation method for concentration of an ore? Explain with an example?

Magnetic Separation Method:

Between ore and gangue, if one of them is magnetic and the other is non-magnetic. Then they are separated by magnetic separation method.

It could be seen in the extraction of the magnetic ores like Haematite [Fe₂O₃] and Magnetite [Fe₃O₄]

In this process, the crushed ore is allowed to

pass through electromagnetic belts; then the mineral particles are retained in the belt while the gangue particles are thrown away.