Question

VV
1)Giving examples, differentiate between 'roasting' and 'calcination'.
2)Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought
iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from
cast iron ?​

Answer 1

Answer:

Here is the answer.

Explanation:

1)Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. eg: carbon, sulphur etc removed as their gaseous oxides.

2)Limestone is added as flux and sulphur, silicon and phosphorus change to their oxides and pass into the slag