Question

All minerals are not the ore but all ores are minerals. The extraction of a particular metal depends upon several factors and overall it has to be convenient and economical.

Which of the following statement is true?

• A. Na-ethyl xanthate is used as frother exclusively.
• B. Levigation cannot be applied for sulphide in any condition.
• C. Froth floatation can be applied for non-sulphide ore also using suitable activator.
• D. Impurities like S and As are removed as elemental vapor in roasting.

Answer 1

Answer: (C)

Froth floatation can be applied for non-sulphide ore also using suitable activator.

(A) Sodium ethylxanthate acts as collector and not frother.

(b) Levigation can be used for sulphide ore to remove majority of gangue when density difference is high.

(C) Froth floatation can be used for non-sulphide ores having sulphide impurities, and the ore is recovered by using suitable activator.

(D) During roasting, impurities such as S and As are removed as their volatile oxides $S{O}_2$ and $A{s}_2{O}_3$, respectively.

Hence, only option C is true.