Which of the following ore is concentrated by Froth floatation process ?
(a) ZnCO3
(b) ZnO
(c) ZnS
(d) Na2S
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c) ZnS
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Answer:
c) ZnS
Explanation:
Zinc sulfide is concentrated by a froth flotation process using a substituted benzotrifluoride compound as depressant for calcium fluoride. The benzotrifluoride compounds are substituted by hydrophilic groups such as hydroxy, carboxylic acid and amino.
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