What is the role of

(a) Depressants in froth floatation ?

(b) Carbon monoxide in Mond’s process ?

(c) Concentrated sodium hydroxide in leaching of alumina from bauxite ?

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Deoressants in froth flotation are used to present one type of sulphide are particles from forming the froth with air bubbles.

(b) Carbon monoxide in Mond's process hups to form volatile complex of nickel. i.e, Ni(CO)_{4} which is subjected to high temperature so that it is decomposes to give pure nickel.

(c) Concentrated sodium hydroxide in leaching - Alumina from bauxite acts as a reducing agent and Alumina dissolves as sodium meta-aluminate and silica as sodium silicate having behind impurities. 

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