JEE AdvancedMetallurgyMedium
Question
Calcium silicate (slag) formed in the slag formation zone in extraction of iron from haematite ore :
Options
A.does not dissolve in molten iron.
B.being lighter floats on the molten iron.
C.is used in cement industry and as building material.
D.prevents the re-oxidation of molten iron.
Solution
(i) Slag is a fusible mass.
(ii) It has low melting point.
(iii) It is lighter than and immiscible with the molten metal. It is due to these impurities that the slag floats as a separate layer on the molten metal and can thus be easily separated from the metal. The layer of the slag on the molten metal prevents the metal from being oxidised. It is used as one of the constituent of cement and in building material.
(ii) It has low melting point.
(iii) It is lighter than and immiscible with the molten metal. It is due to these impurities that the slag floats as a separate layer on the molten metal and can thus be easily separated from the metal. The layer of the slag on the molten metal prevents the metal from being oxidised. It is used as one of the constituent of cement and in building material.
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