In the extraction of iron, hot air is introduced into the blast furnace through?
A
valves
B
open-hearths
C
arcs
D
tuyeres
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Pre-heated air at about 600ºC is blown into the furnaces from the bottom through the tuyeres.
Source: WAEC / JAMB / NECO Classroom Archive (Record #65003)