Explain the role of the following:
(a) CO in the refining of nickel.
(b) Limestone in the metallurgy of Fe.
(c) Depressant in froth flotation method.
Answers
a) CO acts as a reducing agent in the refining of nickel .
Nickel carbonyl being a gas is easily separated from solid impurities. Ni is recovered when nickel carbonyl is decomposed by heating at 450-470K.
Ni (s) + 4 CO(g) ------> Ni(CO)4 (g)
Ni(CO)4 (g) --------> Ni (s) + 4 CO (g)
b) During the extraction of iron from haematite ore, limestone acts as a flux. Limestone decomposes forming CaO which reacts with silica forming slag.
CaCO3 ------> CaO + CO2
CaO + SiO2 -------> CaSiO3
c) In froth floatation process , depressants helps to separate two sulphide ores by selective prevention of froth formation by one ore and allowing the other to come into froth.
For example, in order to separate two sulphide ores (ZnS and Pbs), NaCN is used as a depressant.
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