De que é feito alto-forno
A shaft furnace for smelting pig iron.
- Fole — tem como parte. Air was blown in by bellows, later by blowers.
- Coque — utiliza. The fuel and reducing agent is coke (formerly charcoal).
- Carvão vegetal — utiliza. Before coke, blast furnaces ran on charcoal.
- Stone — é feito de. The shaft of a blast furnace is stone.