1.

Explain the term Froth Floatation Process.

Answer»

Used for removing Gangue from Sulphide ores. 

• Principle behind this process is the preferential wetting of ore particle with oil and gangue by water. 

• A suspension of powdered ore is made with water. 

• To this Collectors(oil, fatty acids etc) and froth stabilisers(cresols, aniline etc) are added 

• Minerals will be wet by oil while gangue by water 

• When the mixture is agitated froth will be formed which will carry the ore particles 

• It is possible to separate two Sulphide ores by using Depressants. 

Eg : In ore containing ZnS and PbS , NaCN acts as a Depressant & selectively prevents ZnS from coming to the froth but allows PbS to come with the froth. 


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