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Concentration of minerals: Magnetic separation

Question:  Describe concentration of minerals.

Answer.

1. Concentration

After mining, ore undergoes crushing, grinding or pulverizing step and converted into the powdered form. Then mineral is separated from gangues from by some physical methods.  This process of separation of minerals is called concentration.  The method of separation of minerals depends upon the nature of material. Some important methods are given as follows. 

i. Magnetic Separation

ii. Cyclone separation

iii. Floatation Process


i. Magnetic Separation

For magnetic ore, a magnet is used to remove minerals from gangues. In this process, the powered ore is dropped over a moving belt. Belt moves over two wheels, one of which is magnetic. Magnetic wheel attracts magnetic ore as it comes near to it. As a result, ore falls further away later than impurities.

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