Question

a) Which of the following is not an Ore of Iron? 

i) Haematite

ii) Magnetite

iii) Malachite

iv) Sidenote

b) Explain froth floatation process for the concentration of Ore.

Answer 1

a) i) Haematite 

b) It is used for removing gangue from sulphide ores. The mineral particles become wet by oils while the gangue particles by water. The nely powdered ore is agitated with water containing little frothing agent (e.g. pine oil) and froth stabilizers (e.g. cresols) by passing a forceful current of air. Heavier gangue particles are left to the bottom. The froth is skimmed o and then dried.