Exercise- I

Mention all the generated and heat output terms in the blast furnace ironmaking.

Solution:

Heat is generated by combustion of carbon. Sensible heat in blast also adds heat input. Small amount of heat may be generated by mixing of silicon in iron, reduction of  by  and silicate formation.

Some heat output terms are: heat carried by slag, hot metal and gases. Heat losses by convection and radiation may be included.

Exercise-II
An iron blast furnace produces pig iron of composition  and rest is iron. The burden of blast furnace consists of the following materials:

 

 and  .Amount 1100Kg per ton of pig iron.

 

The exit gas analyzes  and . Assume no loss of iron in slag.

Required:

• Weight of iron ore/ton of pig iron.
• Wt. of limestone/ton of pig iron, required to produce slag containing.
• Volume of gases
• Volume of blast based on  and balance.
• Heat of decomposition of  at 298K
• Heat content of pig iron and slag at 1700K
• Sensible heat in gases: exit temp is 600K
• Heat of combustion
• Heat absorbed by Boudward reaction
• Heat produced by reduction reactions.