Question

What is the role of tuyères used in blast furnace for extraction of iron?

• A. It enables the even distribution of charge.
• B. To blow a blast of preheated air into the furnace.
• C. It is used to remove molten slag and iron.
• D. It prevents loss of hot gases.

Hint:

Tuyères are essential in maintaining furnace temperature by injecting air, which allows for efficient combustion during the extraction of metals.

Answer 1

The Correct Option is B

Step 1: Understanding the function of tuyères.
Tuyères are tubes or nozzles used in blast furnaces to inject preheated air into the furnace. This is a key part of the smelting process, as it helps to maintain the necessary high temperature for the extraction of iron.
Step 2: Analyzing the options.
(A) It enables the even distribution of charge: This is incorrect, as tuyères are not designed for distributing charge, but for injecting air.
(B) To blow a blast of preheated air into the furnace: Correct — The tuyères' primary role is to inject air, which aids in combustion and maintains the furnace temperature.
(C) It is used to remove molten slag and iron: This function is not performed by the tuyères, but by the movement and collection of molten materials.
(D) It prevents loss of hot gases: Tuyères do not specifically serve to prevent gas loss; their role is focused on air injection.
Step 3: Conclusion.
The correct answer is (B) To blow a blast of preheated air into the furnace.