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(a) Give two points of differences between pig iron and cast iron.

(b) Outline the principle of zone refining.

 

 

 

 
 
 
 
 

Answers (1)

(a) Pig iron :

(1) It is iron obtained from blast furnance.

(2) It contains 4% carbon and small amounts of S, P, Si and Mn and is impure.

Cast iron :

(1) It is obtained by melting pig iron with iron scrap.

(2) It contains 3% carbon.

(b) Zone refining is based on the principle that the impurities are more soluble in molten state than in solid state of metal.

Posted by

Sumit Saini

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