Question

__________ refractories are used in construction of Coke oven wall

• A. Silica
• B. Fire clay
• C. Magnesite
• D. Chromite

Hint:

Silica refractories are commonly used in coke oven walls because of their high-temperature stability and strength.

Answer 1

The Correct Option is A

Concept: Coke oven walls require refractories that can withstand high temperature and maintain dimensional stability for a long time.

Step 1: Coke ovens operate at high temperatures for carbonization of coal.

Step 2: The refractory used in coke oven walls should have:
• high refractoriness,
• good thermal stability,
• good load-bearing capacity at high temperature,
• resistance to deformation.

Step 3: Silica bricks are commonly used in coke oven walls because they have excellent high-temperature strength and good resistance to load at coke oven temperatures.

Step 4: Fire clay, magnesite, and chromite refractories are used in other furnace applications, but coke oven walls are generally made using silica refractories. Therefore, the correct answer is: \[ \boxed{\text{Silica}} \]