Blast furnace charging: location through which the charge is fed In an iron-making blast furnace, identify the correct region/part through which the solid charge (ore, coke, flux) is fed into the furnace. Choose the correct part.

Concept
The charge is introduced at the throat (top) of the blast furnace via the charging apparatus (e.g., bell & hopper or bell-less top). The burden then descends through the stack towards the bosh and hearth.

Why not others
Stack is the shaft region where descending/reaction occurs; bosh is the widest, high-temperature zone; tuyeres introduce hot blast air near the hearth.

Final Answer
Throat (top)