Question

What is the amount of silica used in a slag?

(a) 20% to 30%

(b) 30% to 40%

(c) 40% to 50%

(d) 50% to 60%

The question was asked during an interview.

My question is based upon Zones and Efficiency of Cupola topic in portion Metal Furnace and Practice of Casting-Forming-Welding II

Answer 1

Right choice is (c) 40% to 50%

To elaborate: Slag is known to be acidic in nature and it is found to have some amount of silica content in terms of percentage composition of about 40% to 50%.