Describe the principles of extraction of Zinc from zinc blende.

1.	Describe the principles of extraction of Zinc from zinc blende.
Answer» Important ores of Zn: Zinc blende - ZnS, Calamine- ZnCO₃, and Zincite – ZnO. ZnS is commercially important ore of Zn. Various stages involved in the extraction of Zn from ZnS are as following:- (i) Concentration of ore: It is concentrated by Froth flotation process followed by gravity separation process. (ii) Roasting: The concentrated ore is roasted in presence of air. Following reactions take place: 2ZnS + 3O₂ → 2ZnO + 2SO₂ The mass obtained during roasting is porous and is called porous clinker. (iii) Reduction of ZnO to Zn: ZnO is made into bricketts with coke and clay and heated a 1163 K. Zn formed distills off and is collected by rapid cooling of zinc vapours. ZnO + C → Zn + CO

Answer»

Important ores of Zn:

Zinc blende - ZnS, Calamine- ZnCO₃, and Zincite – ZnO. ZnS is commercially important ore of Zn. Various stages involved in the extraction of Zn from ZnS are as following:-

(i) Concentration of ore: It is concentrated by Froth flotation process followed by gravity separation process.

(ii) Roasting: The concentrated ore is roasted in presence of air. Following reactions take place:

2ZnS + 3O₂ → 2ZnO + 2SO₂

The mass obtained during roasting is porous and is called porous clinker.

(iii) Reduction of ZnO to Zn: ZnO is made into bricketts with coke and clay and heated a 1163 K. Zn formed distills off and is collected by rapid cooling of zinc vapours.

ZnO + C → Zn + CO

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