How did iron come from, natural or something else?

Iron is extracted from iron ore, that is, pyrite or hematite or other iron ores.

Chemical equation of hematite ironmaking

The chemical composition of hematite is α-Fe2O3. Iron-making plant uses hematite, coke, limestone and air as main raw materials to make iron. The main reaction process is: firstly, coke and oxygen in the air generate carbon dioxide (providing heat source), then the generated carbon dioxide continues to react with coke to generate gas reducing agent carbon monoxide, and then the carbon monoxide reduces iron oxide to generate iron and carbon dioxide, thus smelting raw iron.

(1) c+O2 = high temperature = CO2；; Of course, the condition can be listed as ignition, but high temperature is more accurate.

② CO2 +C = high temperature = 2CO；;

③ 3CO+Fe2O3 = high temperature = 2Fe+3CO2

Chemical Equation of Magnetite Ironmaking

Fe3O4+4CO== High temperature ==3Fe+4CO2

Chemical equation of blast furnace ironmaking

Fe2O3+3CO= high temperature =2Fe+3CO2