Question

Which of the following factors helps in minimizing scaffold formation inside a blast furnace?

• A. High alkali content in the burden
• B. Adequate blast pressure and high temperature
• C. Low slag basicity
• D. Oversized coke only

Hint:

Scaffolding is like a "blockage." High heat and pressure keep the material moving so it does not stick.

Answer 1

The Correct Option is B

Step 1: Concept Scaffolds are accretions or "hanging" layers of material that stick to the furnace walls, disrupting the smooth descent of the burden.

Step 2: Meaning These are often caused by the condensation of alkalis or zinc on the cooler walls of the upper furnace.

Step 3: Analysis High alkali content increases scaffold risk. Proper thermal and pressure control (adequate blast pressure and high temperature) ensures that materials flow correctly and prevent localized cooling where accretions form.

Step 4: Conclusion Maintaining adequate blast pressure and high temperatures helps maintain the internal profile and minimize scaffold formation. Final Answer: (B)