Calculate the Weight of Lime Required In a 100 Ton LD Converter Assignment

Assignment Task

Question 1

• Calculate the weight of lime required in a 100 ton LD converter to get a basicity of 3 given that 80 ton hot metal contains 0.8% Si and 20 ton scrap containing 0.15% Si (Assume there is no other source silica and that lime contains 90?O)
• Explain why much more lime than calculated above (question 1.1) is charged in the LD vessel during blowing?
• What problems are associated with using the type of lime above (question 1.2)?
• As a steel plant metallurgist, what precautions would you take to minimise the problems above (question 1.3)?
• Explain why lime is added in the early stages of the blow and in what ways is the bottom injection practice more beneficial?
• What are risks associated with carried over slag and low CaO content in slag?

Question 2

• 2.1 After blowing a 100 ton LD converter for 20 minutes, the blown metal analysis was; 0.05% C, 0.20% Mn. Calculate the amount of ferromanganese needed to raise Mn to 0.80% given FeMn contains 66% Mn and costs R12,000 per ton. 
• If after blowing for only 15 minutes, Mn in blown metal is 0.45%, calculate the saving in ferromanganese by interrupting the blow after 15 minutes 

Question 3

The analysis of hot metal from the mixer is 3% C, 1.5% Si, 1.2% Mn, 0.15% S and 0.9% P.

• Explain giving reasons the step by step BOF procedure that you would recommend to achieve a blown metal analysis of 0.05% C, 0.25% Mn, 0.03% S and 0.03% P.
• Explain why there is no silicon in the blown metal? 
• Calculate the minimum amount of lime required to achieve a slag basicity of 2.8? 
• How would you correct a turn down temperature that is too low?

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