Question

The processes of froth flotation and chromatography are based on

Answer 1

Answer:

For example, froth flotation is a technique commonly used in the mining industry. In this technique, particles of interest are physically separated from a liquid phase as a result of differences in the ability of air bubbles to selectively adhere to the surface of the particles, based upon their hydrophobicity.

(i) Froth floatation process: This method is based on the difference in the wettability of the mineral particles (sulphide ores) and the gangue particles. The mineral particles become wet by oils while the gangue particles by water and hence gets separated.

Answer 2

The processes of froth flotation and chromatography are based on selective distribution.

Explanation:

• Chromatography : - It is based on selective distribution of the various constituents of a mixture between two phases. A stationary phase and a moving phase. The stationary phase can be either solid (such as alumina, silica gel) or tightly bound liquid on a solid support. The moving phase may be liquid or a gas.  

• Froth – floatation process : This process is based on the fact that metallic sulphide ore particles are preferentially wetted by oil where as silicate gangue particles are preferentially wetted by water. So sulphide ore particles rise to the surface in the form of froth while gangue particles sink to the bottom.

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