Question

The extraction of metals from sulphide ore involves:

• A. reduction with carbon
• B. froth floatation
• C. reduction with Al
• D. electrolytic reduction

Answer 1

Answer: (A), (B)

The correct options are
A reduction with carbon
B froth floatation

Froth Flotation is the single most important operation used for the recovery and upgrading of sulphide ore. Only sulphide ores are concentrated by froth flotation process because pine oil selectively wets the sulphide ore and hence brings it to the froth.

Reduction with carbon or roasting is a process of heating of sulphide ore to a high temperature in the presence of air. It is a step of the processing of certain ores. More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component.