Blast furnace is a variant of the furnace dedicated to smelting ores, tools and armor, and it is also the workstation square of ordnance division.

Blast furnace synthesis: iron ingot+furnace+smooth stone

Function of blast furnace: The function of blast furnace is similar to that of ordinary furnace, which can be understood as an upgraded version of furnace. When you put a combustible substance and the burnt fuel in the blast furnace into the blast furnace, it will melt at twice the speed of an ordinary furnace. Of course, the fuel consumption rate will also triple. The only difference from ordinary furnaces is that blast furnaces can't be used to cook food.

Note: blast furnace can only be used to burn minerals, and other types of materials cannot be burned by blast furnace. Of course, you can transfer things through a funnel like a melting pot.