Metallurgical Engineering on Instagram: "Blast Furnace The blast furnace is a counter-current gas/solids reactor in which the descending column of burden materials [coke, iron ore, and fluxes/additives] reacts with the ascending hot gases. The process is continuous, with raw materials being regularly charged to the top of the furnace and molten iron and slag being tapped from the bottom of the furnace at regular intervals. Key steps of the process are as follows: upper part of the furnace - free