The reduction of the ore
At the high temperature at the bottom of the furnace, carbon dioxide reacts with carbon to produce carbon monoxide.
It is the carbon monoxide which is the main reducing agent in the furnace.
Extraction of Tin
The ore is tin stone that contains 10% of the metal as SnO2.
SnO2 + 2C = Sn + 2CO
The moltenmetal is collected from the bottom of the blast furnace.
The metal may be purified elctrolytically