Question

Explain the electromagnetic method for concentrating the ores of metals

Answer 1

Answer:

The concentrated ore is first converted to an oxide after which metal extraction is done by reducing it from an oxide to metal using a suitable reducing agent. Conversion to Oxide In this process, metal refining is done by heating the ore in a limited supply or absence of air.

Answer 2

Separation = Difference in the Magnetic Properties

Explanation:

Magnetic separation

An electromagnetic method of separation is the process of separating ore of metals from the gangue particles depending on the difference in the magnetic properties of the two minerals.

In this method one of the minerals is magnetic, and the other is nonmagnetic.

Steps -

• A thin layer of a finely ground ore is spread or passed over the magnetic roller.
• The magnetic ore particles will attract to the magnetic roller which is in the form of the pulley.
• The gangue particles which are non-magnetic will fall into the heap made and will separate.

Example -

• $Fe (CrO_2)_2$ (Chromite) is a magnetic ore.

• It is separated from the non-magnetic gangue of silica.