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Steelmaking

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Steel millwith twoarc furnaces

Steelmakingis the process of producing steel from iron ore and/orscrap.In steelmaking,impuritiessuch asnitrogen,silicon,phosphorus,sulfur,and excesscarbon(the most important impurity) are removed from the sourced iron, and alloying elements such asmanganese,nickel,chromium,carbon, andvanadiumare added to produce differentgrades of steel.

Steelmaking has existed for millennia, but it was notcommercializedon amassivescale until the mid-19th century. An ancient process of steelmaking was thecrucible process.In the 1850s and 1860s, theBessemer processand theSiemens-Martin processturned steelmaking into aheavy industry.

Today there are two major commercial processes for making steel, namelybasic oxygen steelmaking,which has liquid pig-iron from the blast furnace and scrap steel as the main feed materials, andelectric arc furnace(EAF) steelmaking, which uses scrap steel ordirect reduced iron(DRI) as the main feed materials. Oxygen steelmaking is fueled predominantly by the exothermic nature of the reactions inside the vessel; in contrast, in EAF steelmaking, electrical energy is used to melt the solid scrap and/or DRI materials. In recent times, EAF steelmaking technology has evolved closer to oxygen steelmaking as more chemical energy is introduced into the process.[1]

Steelmaking is one of the mostcarbon emission intensiveindustries in the world. As of 2020,steelmaking is responsible for about 10% ofgreenhouse gas emissions.[2]Tomitigate global warming,the industry will need to find significant reductions in emissions.[3]

History

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Bethlehem SteelinBethlehem, Pennsylvania,was one of the world's largest manufacturers of steel before its 2003 closure.
Main article:Ferrous metallurgy

Steelmaking has played a crucial role in the development of ancient, medieval, and modern technological societies. Early processes of steel making were made during the classical era inAncient China,India,andRome.

Cast ironis a hard, brittle material that is difficult to work, whereas steel is malleable, relatively easily formed and a versatile material. For much of human history, steel has only been made in small quantities. Since the invention of theBessemer processin 19th century Britain and subsequent technological developments in injection technology andprocess control,mass production of steel has become an integral part of the global economy and a key indicator of modern technological development.[4]The earliest means of producing steel was in abloomery.

Early modern methods of producing steel were often labor-intensive and highly skilled arts. See:

An important aspect of theIndustrial Revolutionwas the development of large-scale methods of producing forgeable metal (bar ironor steel). Thepuddling furnacewas initially a means of producingwrought ironbut was later applied to steel production.

The real revolution in modern steelmaking only began at the end of the 1850s when theBessemer processbecame the first successful method of steelmaking in high quantity followed by theopen-hearth furnace.

Modern processes for manufacturing of steel

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Distribution of world steel production by methods

Modern steelmaking processes can be divided into three steps: primary, secondary and tertiary.

Primary steelmaking involves smelting iron into steel. Secondary steelmaking involves adding or removing other elements such as alloying agents and dissolved gases. Tertiary steelmaking involves casting into sheets, rolls or other forms. Multiple techniques are available for each step.[5]

Primary steelmaking

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Main articles:Basic oxygen steelmakingandElectric arc furnace

Basic oxygen

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Basic oxygen steelmakingis a method of primary steelmaking in which carbon-richpig ironis melted and converted into steel. Blowing oxygen through molten pig iron converts some of the carbon in the iron intoCO−
andCO
2,turning it into steel.Refractories—calcium oxideandmagnesium oxide—line the smelting vessel to withstand the high temperature and corrosive nature of the molten metal andslag.The chemistry of the process is controlled to ensure that impurities such as silicon and phosphorus are removed from the metal.

The modern process was developed in 1948 byRobert Durrer,as a refinement of theBessemer converterthat replaced air with more efficientoxygen.It reduced the capital cost of the plants and smelting time, and increased labor productivity. Between 1920 and 2000, labour requirements in the industry decreased by a factor of 1000, to just 0.003-man-hours per tonne. in 2013, 70% of global steel output was produced using the basic oxygen furnace.[6]Furnaces can convert up to 350 tons of iron into steel in less than 40 minutes compared to 10–12 hours in anopen hearth furnace.[7]

Electric arc

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Electric arc furnacesteelmaking is the manufacture of steel from scrap or direct reduced iron melted byelectric arcs.In an electric arc furnace, a batch ( "heat" ) of iron is loaded into the furnace, sometimes with a "hot heel" (molten steel from a previous heat). Gas burners may be used to assist with the melt. As in basic oxygen steelmaking, fluxes are also added to protect the lining of the vessel and help improve the removal of impurities. Electric arc furnace steelmaking typically uses furnaces of capacity around 100 tonnes that produce steel every 40 to 50 minutes.[7]This process allows larger alloy additions than the basic oxygen method.[8]

HIsarna process

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Main article:HIsarna ironmaking process

In HIsarna ironmaking process, iron ore is processed almost directly into liquid iron orhot metal.The process is based around a type of blast furnace called acyclone converter furnace,which makes it possible to skip the process of manufacturing pig iron pellets that is necessary for thebasic oxygen steelmakingprocess. Without the necessity of this preparatory step, the HIsarna process is more energy-efficient and has a lowercarbon footprintthan traditional steelmaking processes.[citation needed]

Hydrogen reduction

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Steel can be produced from direct-reduced iron, which in turn can be produced from iron ore as it undergoeschemical reductionwith hydrogen.Renewable hydrogenallows steelmaking without the use offossil fuels.In 2021, a pilot plant in Sweden tested this process. Direct reduction occurs at 1,500 °F (820 °C). The iron is infused with carbon (from coal) in anelectric arc furnace.Hydrogen produced byelectrolysisrequires approximately 2600kWhper ton of steel. Costs are estimated to be 20–30% higher than conventional methods.[9][10][11]However, the cost of CO2-emissions add to the price of basic oxygen production, and a 2018 study of Science magazine estimates that the prices will break even when that price is €68 per tonne CO2,which is expected to be reached in the 2030s.

Secondary steelmaking

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Secondary steelmaking is most commonly performed inladles.Some of the operations performed in ladles include de-oxidation (or "killing" ), vacuum degassing, alloy addition, inclusion removal, inclusion chemistry modification, de-sulphurisation, and homogenisation. It is now common to perform ladle metallurgical operations in gas-stirred ladles with electric arc heating in the lid of the furnace. Tight control of ladle metallurgy is associated with producing high grades of steel in which the tolerances in chemistry and consistency are narrow.[5]

Carbon dioxide emissions

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As of 2021,steelmaking is estimated to be responsible for around 11% of the global emissions of carbon dioxide and around 7% of the global greenhouse gas emissions.[12][13]Making 1 ton of steel emits about 1.8 tons of carbon dioxide.[14]The bulk of these emissions results from theindustrial processin which coal is used as the source of carbon that removes oxygen from iron ore in the following chemical reaction, which occurs in ablast furnace:[15]

Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)

Additional carbon dioxide emissions result from mining, refining and shipping the ore used,basic oxygen steelmaking,calcination,and thehot blast.Carbon capture and use or carbon capture and storage are proposed techniques to reduce the carbon dioxide emissions in the steel industry and reduction of iron ore usinggreen hydrogenrather than carbon.[16]See below for further decarbonization strategies.

Mining and extraction

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Coal and iron ore mining are very energy intensive, and result in numerousenvironmental damages,from pollution, to biodiversity loss, deforestation, and greenhouse gas emissions. Iron ore is shipped great distances to steel mills.

Blast furnace

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Main article:Blast furnace

To make pure steel, iron and carbon are needed. On its own, iron is not very strong, but a low concentration of carbon – less than 1 percent, depending on the kind of steel – gives the steel its important properties. The carbon in steel is obtained from coal and the iron from iron ore. However, iron ore is a mixture of iron and oxygen, and other trace elements. To make steel, the iron needs to be separated from the oxygen and a tiny amount of carbon needs to be added. Both are accomplished by melting the iron ore at a very high temperature (1,700 degrees Celsius or over 3,000 degrees Fahrenheit) in the presence of oxygen (from the air) and a type of coal calledcoke.At those temperatures, the iron ore releases its oxygen, which is carried away by the carbon from the coke in the form of carbon dioxide.

Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)

The reaction occurs due to the lower (favorable) energy state of carbon dioxide compared to iron oxide, and the high temperatures are needed to achieve theactivation energyfor this reaction. A small amount of carbon bonds with the iron, formingpig iron,which is an intermediary before steel, as it has carbon content that is too high – around 4%.[17]

Decarburization

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Main articles:DecarburizationandBasic oxygen steelmaking

To reduce the carbon content in pig iron and obtain the desired carbon content of steel, the pig iron is re-melted and oxygen is blown through in a process calledbasic oxygen steelmaking,which occurs in aladle.In this step, the oxygen binds with the undesired carbon, carrying it away in the form of carbon dioxide gas, an additional source of emissions. After this step, the carbon content in the pig iron is lowered sufficiently and steel is obtained.

Calcination

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Main articles:CalcinationandSlag

Further carbon dioxide emissions result from the use oflimestone,which is melted at high temperatures in a reaction calledcalcination,which has the following chemical reaction:

CaCO3(s) → CaO(s) + CO2(g)

Carbon dioxide is an additional source of emissions in this reaction. Modern industry has introducedcalcium oxide(CaO,quicklime) as a replacement.[18]It acts as a chemicalflux,removing impurities (such asSulfurorPhosphorus(e.g.apatiteorfluorapatite)[19]) in the form ofslagand keeps emissions of CO2low. For example, the calcium oxide can react to remove silicon oxide impurities:

SiO2+ CaO → CaSiO3

This use of limestone to provide a flux occurs both in the blast furnace (to obtain pig iron) and in thebasic oxygen steel making(to obtain steel).

Hot blast

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Main article:Hot blast

Further carbon dioxide emissions result from thehot blast,which is used to increase the heat of the blast furnace. The hot blast pumps hot air into the blast furnace where the iron ore is reduced to pig iron, helping to achieve the high activation energy. The hot blast temperature can be from 900 to 1,300 °C (1,650 to 2,370 °F) depending on the stove design and condition. Oil,tar,natural gas, powdered coal andoxygencan also be injected into the furnace to combine with the coke to release additional energy and increase the percentage of reducing gases present, increasing productivity. If the air in the hot blast is heated by burning fossil fuels, which often is the case, this is an additional source of carbon dioxide emissions.[20]

Strategies for reducing carbon emissions

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The steel industry produces 7-8% of CO2emissions created by humans (almost two tonnes for every tonne of steel produced), and it is one of the most energy-consuming industries on earth.[21][22]There are several carbon abatement and decarbonization strategies in the steelmaking industry, which on the basic manufacturing process used. Options fall into three general categories: switching the energy source fromfossil fuelstowindandsolar;increasing the efficiency of processing; and innovative new technological processes. All three may be used in combination.[citation needed]

"Green steel" is the term used for manufacturing steel without the use offossil fuels,[23]that is,zero-emissionproducts. However, not all companies claiming to produce green steel meet this criterion. Some merely reduce emissions.[24]Australia produces nearly 40% of the world's iron ore, and the government, via theAustralian Renewable Energy Agency(ARENA), is helping to fund many research projects involving direct reduced ironmaking (DRI) to increase green steel and iron production. Large companies such asRio Tinto,BHP,andBlueScopeare developing green steel projects.[25]

CO2emissions vary according to energy sources. Whensustainable energysuch as wind or solar are used to power the process, either in electric arc furnaces or to create hydrogen as a fuel, emissions can be reduced dramatically. European projects from HYBRIT,LKAB,Voestalpine,andThyssenKruppare pursuing strategies to reduce emissions.[26]HYBRIT claims to produce true "green steel".[24]

Top gas recovery in BF/BOF

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Top gas from the blast furnace is the gas that is normally exhausted into the air during steelmaking. This gas contains CO2and is also rich in the reducing agents of H2and CO. The top gas can be captured, the CO2removed, and the reducing agents reinjected into the blast furnace.[citation needed]A 2012 study suggested that this process can reduce BF CO2emissions by 75%,[27]while a 2017 study showed that emissions are reduced by 56.5% with carbon capture and storage, and reduced by 26.2% if only the recycling of the reducing agents is used.[28]To keep the carbon captured from entering the atmosphere, a method of storing it or using it would have to be found.

Another way to use the top gas would be in a top recovery turbine which then generates electricity, which could be used to reduce the energy intensity of the process, if electric arc smelting is used.[26] Carbon could also be captured from gases in the coke oven. As of 2022,separating the CO2 from other gases and components in the system, and the high cost of the equipment and infrastructure changes needed, have kept this strategy minimal, but the potential for emission reduction has been estimated to be up to 65% to 80%.[29][26]

H2direct reduced ironmaking

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Alternatively, hydrogen can be used in a shaft furnace to reduce the iron oxides. Only water is produced as the by-product of the reaction betweeniron oxideand hydrogen, and results in emission-free iron-making.[30]Known as hydrogen direct reduction (HDR), this is the most prominent among green steel technologies. This differs from conventional steel making processes, in which carbon incokeis used as the reductant (to strip oxygen from iron ore), which creates iron and carbon dioxide. Where hydrogen is generated from a renewable energy source as both the alternative reductant and the fuel, the greatest gain in CO2emissions is achieved. As of 2021, onlyArcelorMittalin France,Voestalpinein Austria, andTATAin the Netherlands were committed to using green hydrogen to make steel from scratch.[31]

HDR is employed in the HYBRIT project in Sweden.[32]However, this approach requires a substantial amount of renewables to produce the needed renewable hydrogen. For the European Union, it is estimated that the hydrogen demand for hydrogen-based steelmaking would require 180 GW of renewable capacity.[33]

Iron ore electrolysis

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Another developing possible technology is iron ore electrolysis, where the reducing agent is simply electrons as opposed to H2,CO, or carbon.[26]One method for this is molten oxide electrolysis. Here, the cell consists of an inert anode, a liquid oxide electrolyte (CaO, MgO, etc.), and the molten steel. When heated, the iron ore is reduced to iron and oxygen. Boston Metal is at the semi-industrial stage for this process, with plans to reach commercialization by 2026.[34]Expanding a pilot plant inWoburn, Massachusetts,and building a production facility in Brazil, it was founded by MIT professorsDonald Sadowayand Antoine Allanore.[35]

A research project which involved the steel companyArcelorMittaltested a different type of iron ore electrolysis process in a pilot project called Siderwin.[36]It operates on relatively low temperatures (around 110 °C), while the Boston Metal process operates on high temperatures (~1.600 °C). As of March 2023ArcelorMittal is investigating whether the company wants scale up the technology and build a larger plant, and expects an investment decision by 2025.[37]

Scrap-use in BF/BOF

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Scrapin steelmaking refers to steel that has either reached its end-of-life use, or was generated during the manufacture of steel components. Steel is easy to separate and recycle due to its inherent magnetism and using scrap avoids the emissions of 1.5 tons of CO2for every ton of scrap used.[38]As of 2023,steel has one of the highest recycling rates of any material, with around 30% of the world's steel being made from recycled components. However, steel cannot be recycled forever, and the recycling processes, using arc furnaces, use electricity.[21]

H2enrichment in BF/BOF

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In the blast furnace, the iron oxides are reduced by a combination of CO, H2,and carbon. Only around 10% of the iron oxides are reduced by H2.With H2enrichment processing, the proportion of iron oxides reduced by H2is increased, so that less carbon is consumed and less CO2is emitted.[39]This process can reduce emissions by an estimated 20%.[citation needed]

Other strategies

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TheHIsarna ironmaking processwas described above as a way of producing iron in a "cyclone converter furnace" without the pre-processing steps of choking/agglomeration, which reduces the CO2emissions by around 20%.[40]

One speculative idea is and ongoing project by SuSteel to develop a hydrogen plasma technology that reduces the oxides with hydrogen, as opposed to with CO or carbon, and melts the iron at high operating temperatures.[26]

In steelmaking, coal and coke are used for fuel and iron reduction.Biomasssuch as charcoal or wood pellets are a potential alternative fuel, but this does not actually reduce emissions, as the burning biomass still emits carbon, it merely provides a "carbon offset",where emissions are" traded "against the sequestration of the source biomass," ofsetting "emissions by 5% to 28% of current CO2values.[26]Offsetting has a very low reputation globally, as cutting down the trees to create the pellets or charcoal does not sequester carbon, it interrupts the natural sequestration the tree was providing. Offsetting is not reduction.[citation needed]

Outlook

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Overall, there are a number of innovative methods to reduce CO2emissions within the steelmaking industry. Some of these, such as top gas recovery and using hydrogen reduction in DRI/EAF are highly feasible with current infrastructure and technology levels. Others, such as hydrogen plasma[41]and iron ore electrolysis[42]are still in the research or semi-industrial stage.

See also

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References

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  41. ^Souza Filho, I. R.; Ma, Y.; Kulse, M.; Ponge, D.; Gault, B.; Springer, H.; Raabe, D. (2021-07-01)."Sustainable steel through hydrogen plasma reduction of iron ore: Process, kinetics, microstructure, chemistry".Acta Materialia.213:116971.arXiv:2208.00661.doi:10.1016/j.actamat.2021.116971.ISSN1359-6454.
  42. ^Cavaliere, Pasquale (2019), Cavaliere, Pasquale (ed.),"Electrolysis of Iron Ores: Most Efficient Technologies for Greenhouse Emissions Abatement",Clean Ironmaking and Steelmaking Processes: Efficient Technologies for Greenhouse Emissions Abatement,Cham: Springer International Publishing, pp. 555–576,doi:10.1007/978-3-030-21209-4_10,ISBN978-3-030-21209-4,retrieved2024-04-29
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