Question

Which of the following ore is best concentrated by froth-flotation method.

• A. Galena
• B. Cassiterite
• C. Magnetite
• D. Malachite

Answer 1

Answer: (A)

Galena

Answer 2

Here only Galena is $PbS$ (a sulphide ore).

Cassiterite is $SnO_{2}$ (oxide ore). Magnetite is $Fe_{3}O_{4}$ (Oxide ore) and Malachite is $Cu(OH)_{2}.CuCO_{3}$ (Carbonate ore). The froath floatation process is used to concentrate sulphide ores, based on preferential wetting properties with froating agent and water.