In the blast furnace, it is so hot that carbon monoxide can be used, in place of carbon, to reduce the iron(III ... so that workers have somewhere to live close-by away from built-up areas ...

Archaeologists have discovered iron objects at six sites in Tamil Nadu, dating back to 2,953–3,345 BCE, or between 5,000 to 5,400 years old. This suggests that the process of extracting ...