How was it cleansed and purged? The more detail the better please, or a good link that works as well.
The production of iron by humans began probably sometime after 2000 BCE in south-west or south-central Asia, perhaps in the Caucasus region. Thus began the Iron Age, when iron replaced bronze in implements and weapons. This shift occurred because iron, when alloyed with a bit of carbon, is harder, more durable, and holds a sharper edge than bronze. For over three thousand years, until replaced by steel after CE 1870, iron formed the material basis of human civilization in Europe, Asia, and Africa. - - - - - I believe that the referenced websites will provide the information you are seeking.
Impurities (notably carbon in excess of 2%) in iron has always been a problem. For those in the Middle Ages, they attempted to solve the problem by repeatedly heating and cooling the iron (as has recently been discovered in examining the origins of Damascus steel) to drive out the carbon. . Later, it was found that if one used coke (instead of coal) during the smelting process, this would make a purer form of iron . And even later, it was discovered that by blowing air into the iron while it was still molten (the Bessemer process) one could drive out all of the impurities from the iron; which would allow for a controlled re-introduction of desired amount carbon (and/or other materials) to make steel of any form/type that one desires.
