Question
Question: Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding...
Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding
A
Carbon which reduces the impurities
B
Water which dissolves the impurities
C
Limestone which changes impurities into oxides and pass into slag
D
Iron oxide which reacts with impurities by forming slag.
Answer
Limestone which changes impurities into oxides and pass into slag
Explanation
Solution
Limestone is added as flux and S, Si and P change to their oxides and pass into the slag.