CDR Salamander talks about the importance of an old industry to a modern industrial economy:
We probably need to start this out by explaining exactly what a blast furnace is and why it is important if you want to be a sovereign nation.
First of all, what it does;
The purpose of blast furnace is to chemically reduce and physically convert iron oxide into liquid iron called “hot metal” The blast furnace is a huge, steel stack lined with refractory brick where iron ore, coke and limestone are charged into the top and preheated air is blown into the bottom. The raw materials require 6 to 8 hours to descend to the bottom of the furnace where they become the final product of liquid slag and liquid iron. These liquid products are drained from the furnace at regular intervals. The hot air that was blown into the bottom of the surface ascends to the top in 6 to 8 seconds after going through numerous chemical reactions. Once the blast furnace is started it continuously runs for four to ten years with only short stops to perform planned maintenance.
Why are blast furnaces so important? Remember the middle part of Billy Joel’s “Iron, coke, chromium steel?”
“Coke” is in essence purified coal, almost pure carbon. It is about the only thing that can at scale make “new” or raw iron, aka “pig iron”. Only coke in a blast furnace can make enough heat to turn iron ore in to iron. You can’t get that heat with an electric furnace.
Pig iron is the foundation of everything that follows that makes an industrial power. If you cannot make your own pig iron, you are just LARP’n as a real power.
It takes a semester at least to understand this, but here is all you really need to know;
Primary differences
While the end product from each of these is comparable, there are clearly differences between their capabilities and process. Comparing each type of furnace, the major distinctions are:
Material source – blast furnaces can melt raw iron ore as well as recycled metal, while electric arc furnaces only melt recycled or scrap metal.
Power supply – blast furnaces primarily use coke to supply the energy needed to heat up the metal, while EAFs use electricity to accomplish this.
Environmental impact – because of the fuels used for each, EAFs can produce up to 85% less carbon dioxide than blast furnaces.
Cost – EAFs cost less than blast furnaces and take up less space in a factory.
Efficiency – EAFs also reach higher temperatures much faster and can melt and produce products more quickly, as well as having more precise control over the temperature compared to blast furnaces.
We’ll get to that environmental impact later, but the “Material source” section is your money quote.
Without a blast furnace, all you can do is recycle scrap iron.
You cannot fight wars at scale if all you have is scrap iron. You cannot be an industrial hub off of just scrap iron. If you are a nation of any size, you then become economically and security vulnerable at an existential level. I don’t care how much science fiction you get nakid and roll in; wars are won by steel, ungodly amounts of steel.
Where do you get the steel to build your warships? Your tanks? Your factories? Your buildings? Your factories?
If you can only use scrap, then you are simply a scavenger living off the hard work of previous generations. Eventually you run out. You will wind up like the cypress mills of old Florida where, once they ran out of cypress trees, they simply sold off the cypress lumber their mills were constructed of … and then went bankrupt.
