Explain the role of depressor in Froth Floatation process. What information do Ellingham diagrams provide ?
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Depressants are those substances which selectively prevent certain type of particles from forming the froth with the bubbles. For example, NaCN is added as a depressant for the separation of an ore containing ZnS and PbS.
Ellingham diagram is the graphical representation of Gibbs energy. It provides a basis for considering the choice of reducing agent in the reduction of oxides and helps us in predicting the feasibility of thermal reduction of an ore.
Ellingham diagram is the graphical representation of Gibbs energy. It provides a basis for considering the choice of reducing agent in the reduction of oxides and helps us in predicting the feasibility of thermal reduction of an ore.
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1. ROLE OF Depressant in Froth Flotation:
Depressant are used in froth flotation in separating two sulphide ore from coming together by dissolving one of them.
For example:
When a mixture of ZnS and PbS using potassium xanther as collector another chemical called sodium cyanide [NaCN] is added.
Sodium cyanide makes the ZnS particles suspended in water whereas PbS floats on water , which can be collected.
4NaCN+ZnS ----->Na2[Zn(CN)4] +Na2S
2. a)Ellingham diagrams are the graphical representation of variation of Gibbs energy.
b)Ellingham diagrams indicate the spontaneous nature of a given redox reaction .
Depressant are used in froth flotation in separating two sulphide ore from coming together by dissolving one of them.
For example:
When a mixture of ZnS and PbS using potassium xanther as collector another chemical called sodium cyanide [NaCN] is added.
Sodium cyanide makes the ZnS particles suspended in water whereas PbS floats on water , which can be collected.
4NaCN+ZnS ----->Na2[Zn(CN)4] +Na2S
2. a)Ellingham diagrams are the graphical representation of variation of Gibbs energy.
b)Ellingham diagrams indicate the spontaneous nature of a given redox reaction .
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