However, its reliance on blast furnace smelting processes ... a flash smelting technology capable of directly producing liquid iron. They obtained a patent in 2013 and spent the next decade ...

The main process used to make iron today — melting ore in searing-hot blast furnaces driven by burning ... current to draw a metal out of a liquid solution. The metal gets plated onto an ...

The " Baltimore Sun P gives a list of thirty-one blast furnaces, all these are in Maryland ol which it says that most of them have been idle during the late depression and excessive importation ...

Up to 1709, furnaces could only use charcoal to produce iron. However, wood (which is what charcoal is made from) was becoming more expensive, as forests were being cleared for farmland and timber.