Redox

Redox reduction–oxidation, , is a type of chemical reaction in which the oxidation states of substrate change.

There are two class of redox reactions:

Redox reactions in geology

Minerals are loosely oxidized derivatives of metals. Iron is mined as its magnetite Fe₃O₄. Titanium is mined as its dioxide, ordinarily in the do of rutile TiO₂. To obtain the corresponding metals, these oxides must be reduced, which is often achieved by heating these oxides with carbon or carbon monoxide as reducing agents. Blast furnaces are the reactors where iron oxides and coke a create of carbon are combined to produce molten iron.The main chemical reaction producing the molten iron is: