The oxygen must be removed from the iron(III) oxide in order to leave the iron behind.
References, bohn,.D., Mueller,.M., Cleeton,.P., Hayhurst,.N, Davidson,.F., Scott,.A., Dennis,.S.: Production of very pure hydrogen with simultaneous capture of carbon dioxide using the redox reactions of iron oxides in packed beds.
Raw materials for the reaction, the raw materials for extracting iron and their function in the process.Calcium carbonate calcium oxide carbon dioxide.Google Scholar, trushenski,.P., Li,., Philbrook,.O.: Non-topochemical reduction of iron oxides.CrossRef, google Scholar, tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2009.A promo auto gennaio 2018 temperature well above 700 C is required to favour the formation of carbon monoxide.Calcium oxide is basic (as it is a metal oxide) and silica is acidic (as it is a non-metal oxide).In the blast furnace, it is so hot that carbon monoxide can be used to reduce the iron oxide in place of carbon: iron oxide carbon monoxide iron carbon dioxide.Calcium oxide silica calcium silicate, caO(s) SiO2(s) CaSiO3(l).Iron ores such as haematite contain iron(III) oxide, Fe2O3.
Bogdandy,.; Engell,.J.: The Reduction of Iron Ores.
The oxygen must be removed from the iron oxide to leave the iron behind.
Hot fine-dispersed iron would be quickly oxidized in air (for example, steel wool can burn in air) whereas fused iron is only oxidized at the surface of the liquid.
Reactions in which oxygen is removed are called reduction reactions.
The direct reduction with carbon is only possible if the iron oxide (ceFe2O3, ceFe3O4, or ceFeO) is present as a liquid.Hence, a part of the carbon has to be burned in order to generate the required heat and to produce carbon monoxide.CeFeO_n nCO - Fe nCO2, the required carbon monoxide is produced from the exothermic reaction of carbon with oxygen ce2C O2 - 2CO and from the endothermic Boudouard rection of carbon with carbon dioxide.Google Scholar, la Nauze,.Carbon is more reactive than iron, so it can displace iron from iron(III) oxide.Note that the pig iron produced in the blast furnace process has a high carbon content, which significantly lowers the melting point.
Fe2O3 3CO 2Fe 3CO2.
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The reduction reactions of iron oxide in carbon monoxide and carbon dioxide mixtures were investigated in a fluidized bed.