MetallurgyMedium
Question
An ore after levigation is found to have acidic impurities. Which of the following can be used as flux during smelting operation ?
Options
A.H2SO4
B.CaCO3
C.SiO2
D.both (B) and (C)
Solution
An infusible acidic impurity is removed by reacting with basic oxide, e.g., SiO2 forming fusible slag.
CaCO3 → CaO + CO2 ; SiO2 (acidic oxide) + CaO (basic oxide) → CaSiO3 (slag).
CaCO3 → CaO + CO2 ; SiO2 (acidic oxide) + CaO (basic oxide) → CaSiO3 (slag).
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