Concentration Of Ores

Sulphide ores are typically concentrated using the froth flotation method. This method is highly effective for separating sulphide minerals from gangue (impurities) because sulphide ores are generally hydrophobic and tend to attach to oil froths, while the gangue particles remain in the water phase. In this process:

• The ore is crushed and mixed with water and additives like oils or chemicals.
• Air bubbles are introduced into the mixture, forming froth.
• The sulphide particles adhere to the froth and float to the surface, where they can be collected.

Other methods such as washing, hand picking, and magnetic separation are not suitable for sulphide ores:

• Washing: Suitable for removing soluble impurities but not effective for sulphides.
• Hand picking: Used for large, easily distinguishable ores and not practical for fine-grained sulphides.
• Magnetic separation: Used for ores with magnetic properties, which sulphides generally lack.

Final Answer: The most suitable method for the concentration of sulphide ores is , which corresponds to option .

Sulphide ores are those ores that contain sulphur in combination with a metal.
Galena (PbS) is a sulphide ore of lead.
Cinnabar (HgS) is a sulphide ore of mercury.
Copper iron pyrites (CuFeS_2) is a sulphide ore of copper and iron. However, pyrolusite (MnO_2) is not a sulphide ore; it is an oxide ore of manganese.

The correct option is (A): Pyrolusite