Iron(III) oxide

Second, cobalt in iron oxide, with and without silica.

In a slag made of iron oxide, Fe2O3, and cobalt oxide, County 3O4, cobalt and iron form a spinel oxide, County Fe3O4.

If silica is added, an iron silicate with the olivine structure, phthalite with formula Fe, company 2SiO4, can form as well, and cobalt is shared between the two.

The spinel is magnetic, which makes magnetic separation possible, and it is the typical collector phase for transition metals in iron-rich slags.

The most important industrial example of carbon reduction is the blast furnace for extracting iron.

Iron ore, mainly hematite, which is iron oxide, Fe2O3, is mixed with coke, which is carbon, and limestone, which is calcium carbonate.

Hot air is blasted in at the bottom.

The coke burns to form carbon dioxide.