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The ‘carbon boil” is an important part of refining of steel in melting furnaces. Which of the following statements are correct for carbon boil?

1. Agitating the bath, causes thorough mixing.

2. Reduction of carbon, nitrogen and hydrogen.

3. Bring non-metallic into contact with slag and hence cleans the metal.


1. 1 and 2 only
2. 1 and 3 only
3. 1, 2 and 3
4. 2 and 3 only
5.

1 Answer

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Correct Answer - Option 3 : 1, 2 and 3

Concept:

Among all steel making reactions, oxidation of carbon is the reaction whose product is gas i.e. CO. 

‘Carbon boil’ is CO gas bubbling to the liquid steel surface. It is a manifestation of carbon removal from the melt via oxidation. Large C contents, as in steelmaking from pig iron, are removed by oxygen blown through the melt. 

Advantages of Carbon Boil:

  • Carbon Boil can induce stirring in metal and slag phases during steelmaking leading to homogenization of bath temperature and composition and less sloping.
  • It is also responsible for increase in Metal-Slag, Metal-Gas and Slag-Gas interfacial area resulting in faster rate of reactions.
  • It also helps in removal of inclusions.
  • CO gas has a high calorific value and post combustion of CO in steel making can contribute to energy efficiency.
  • When carbon bubble happens, it results into ensuing evacuation of hydrogen and nitrogen gases, at last creating clean steel.

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