At 500 - 800 K, the reactions taking place are:
3Fe2O3 + CO →→ 2Fe3O4 + CO2
Fe3O4 + 4CO →→ 3 Fe + 4 CO2
Fe2O3 + CO →→ 2FeO + CO2
Limestone decomposes to CaO and CO2.
CaO combines with impurity (i.e.) SiO2 to form slag which is then removed.
CaO + SiO2→→ CaSiO3
a. When silver is leached with NaCN in the presence of air it forms complex [Ag( CN)2]-
b. When copper matte is charged into silica lined converter and hot air blast is blown FeS undergoes roasting to FeO, which combines with SiO2 to form slag whereas Cu2S on roasting gives Cu2O which on reduction gives Cu.
c. When NaCN is added in an ore containing PbS and ZnS during concentration by froth floatation method it selectively prevents the ZnS from coming to the froth i.e., It acts as Depressant.
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