Question

Write the principle involved in the following: Froth floatation method of concentration of sulphide ore.

Answer 1

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 This method is based on the principle that the ore particles are preferentially wetted by oil whereas gangue particles are preferentially wetted by water. This method is used for the concentration of sulphide ores.

Answer 2

In this method the finely ground ore is put into a big tank containing ample amount of water. Certain vegetables oil such as Pine oil ,Eucalyptus oil is added in the water for the formation of forth.Pressurised air is blown through the water. There is an agitator is used as per the requirements. Bubbles are formed due to the blown air. Due to agitation a foam is formed from oil, water and air bubbles together, due to the agitation. This foam rises to the surface of water and floats. That is why this method is called Forth Floating Procees.

Particles of certain sulphide ore float with the foam on water as they preferencially get wetted by the oil. For example, this method is used for the concentration of Zinc Blend (ZnS) and Copper Pyrite (CuFeS2) means Copper Iron Sulphide.