- Aug 23, 2015
A coal forge can reach ~1,900°C.I think the one I worked at have operating temperature of 800 - 1200 degree Celcius which is impossible in post-apocalyptic world of fallout.
A forge is pretty much a direct firing furnace. Cement is made in kiln, a rotating cylinder of 15 meter. And cement is not made by direct heating of the cylinder/kiln through furnace because it will cause uneven heat distribution. Instead you are flowing hot air into the rotating cylinder + a gas + fine coal fired furnace on the opposite end of the cylinder. It requires precise temperature control during material input which move towards the gas fired furnace. The different "zone" along the cylinder with different temperature profile propagates different chemical reaction. Klin is also supported with certain inclination (I forgot how much degree) which, with the RPM of the cylinder, dictates the flow speed of material along the cylinder which with the aforementioned temperature zone allows the material to correctly progress through reaction.
Not to mention the pre-treatment of raw material to separate CO2 component from the Ca.CO3 (Limestone). Not to mention the grinding process of limestone, mixing the with mud, and additional component to give sufficient mineral to create industrial cement.