Editing Redox (section)

==Redox reactions in geology==
[[File:VysokePece1.jpg|thumb|250px|right|[[Blast furnace]]s of [[Třinec Iron and Steel Works]], Czech Republic]]

Minerals are generally oxidized derivatives of metals.  [[Iron]] is mined as ores such as [[magnetite]] (Fe<sub>3</sub>O<sub>4</sub>) and [[hematite]] (Fe<sub>2</sub>O<sub>3</sub>).  [[Titanium]] is mined as its dioxide, usually in the form of [[rutile]] (TiO<sub>2</sub>). These oxides must be reduced to obtain the corresponding metals, often achieved by heating these oxides with carbon or carbon monoxide as reducing agents. [[Blast furnace]]s are the reactors where iron oxides and coke (a form of carbon) are combined to produce molten iron. The main chemical reaction producing the molten iron is:<ref>{{Ullmann |doi=10.1002/14356007.a14_461.pub2|title=Iron|year=2006|last1=Oeters|first1=Franz|last2=Ottow|first2=Manfred|last3=Meiler|first3=Heinrich|last4=Lüngen|first4=Hans Bodo|last5=Koltermann|first5=Manfred|last6=Buhr|first6=Andreas|last7=Yagi|first7=Jun-Ichiro|last8=Formanek|first8=Lothar|last9=Rose|first9=Fritz|last10=Flickenschild|first10=Jürgen|last11=Hauk|first11=Rolf|last12=Steffen|first12=Rolf|last13=Skroch|first13=Reiner|last14=Mayer-Schwinning|first14=Gernot|last15=Bünnagel|first15=Heinz-Lothar|last16=Hoff|first16=Hans-Georg}}</ref>
:{{chem2|Fe2O3 + 3 CO -> 2 Fe + 3 CO2}}