Answer
See definitions below
Work Step by Step
(a) Roasting is the heating of a mineral sulfide in the air at high temperatures to convert it to the oxide.
(b) Smelting is the reduction of the metal oxide to the free metal using heat and a reducing agent such as coke.
(c) Flotation is a separation process in which the ore is removed from the gangue by exploiting the difference in density in the presence of detergent. The gangue sinks to the bottom and the lighter ore-detergent mix is skimmed off the top.
(d) Refining, using electricity or heat, is the final step in the process to yield the pure element.
