Which desulphurising agent removes sulphur from iron?

Q.  Which desulphurising agent is used to remove sulphur from iron during melting?
- Published on 11 Sep 15

a. Calcium carbide
b. Sodium carbonate
c. Soda ash
d. All of the above

ANSWER: All of the above

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    Discussion

  • Sravanthi   -Posted on 21 Nov 15
    - Hard, brittle white cast iron is produced because of high sulphur content in cast iron.

    - Sulphur along with combined carbon also produces iron sulphide when it reacts with iron.

    - Spheroidal cast iron is produced by following three steps: 1) Desulphurising 2) Nodulising 3) Inoculation

    Desulphurising:

    - Sulphur is removed from iron because its presence leads to formation of graphite flakes. Hence this sulphur is removed by melting. It can also be removed by mixing desulphurising agent in iron.

    - Calcium carbide and Sodium carbonate also called as soda ash are the desulphurising agents used.

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