People Made Fun Of Me For Being Jobless But Its Not Bad At All - Chapter 3

There were things that didn’t made sense in the way it was written. But they almost made sense, or putting it differently, made sense if you rephrased it.
I’m too lazy to look up examples, just reread the previous chapters carefully.

Usually the first iron is really low quality with high impurities. Largely iron is hard to melt, and the impurities aren’t known, or how to remove them isn’t known. And how to get to a more high purity raw material isn’t known. Which still has other impurities that have to be removed.
…
I better explain:
Iron sand, no matter how you wash it, still has a high amount of silica sand in it. You only can remove most of that with using a magnet. That, however, is a 19th/20th century method.
The result now has almost none of that, but still a bunch of sulfur (and similar) compounds. You only can get rid of that by “baking” it in a “high” oxygen environment (plenty of fresh air will do, but it has to bypass the heating fire). Baking means the iron won’t even be heated to red hot. But still hot enough to burn off other components.
Without those steps you get pig iron at best. (Well, you can bypass that by using meteor iron that already is highly pure. Downside is, it is effing rare)
To really completely get high purity iron you need completely melt the iron to almost watery thin. That is where most antique techniques failed. Without that there’s still some silicate impurities.
With it they completely separate.
But at that point you can make true steel anyway.