This production was distributed among a series of different slag types: blast furnace slag, LD slag, electric arc furnace slag, AOD slag, ladle furnace slag and slag from desulphurisation. Figure 1 shows some optical microscopic pictures of steel-slag. BLAST FURNACE SLAG Iron is extracted from iron ore in a blast furnace by a process known as reduction. slag. Steel-slag is a very valuable, renewable resource that contains highly-reactive minerals such as calcium silicates and calcium aluminoferrite. In 2006, 10-15 million metric ton of steel slag was generated in the U.S. Out of the total steel slag produced in the U.S. every year, about 50-70% is used as aggregate for road and pavement construction and Table 3 shows industrial production samples with their proportions, strengths and the comparison against the corresponding China standard strength requirements. c. Plain light, 250X A pile of RO-phase and tabular C3S. There are several different types of steel slag produced during the manufacturing process, including furnace slag, raker slag, ladle slag, and cleanout or pit slag,. The characteristics of steel-slag as a supplementary cementitious material are also discussed. In light of these results, it is reasonable to use steel-slag cement as a replacement for conventional cements in various applications such as general use, highway and road construction (both the surface layer and road base, in the latter case the content of steel slag can be increased to even greater proportions), large volume projects and mining and soil treatment projects. used in this study. Thus, the value ranges shown are likely too restrictive. It is recognized as one of the best secondary cementitious material for … Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.Slag is usually a mixture of metal oxides and silicon dioxide.However, slags can contain metal sulfides and elemental metals. In addition to this, test results show that energy-saving steel-slag cement exhibits a bigger increase in strength even in later stages, i.e., after 180 days, than conventional OPC. The worldwide average recovery rate for slag varies from over 80% for steelmaking slag to nearly 100% for ironmaking slag. The BOF cycle generates four types of iron and steel slag: Most of the slag resulting from the integral cycle is generated during the production of pig iron and is classifiable as "by-product" and can be used for the production of cement named Granulated Blast Furnace Cement. In such preparations OPC clinker is about 15-30%, steel-slag around 30-40% and blastfurnace slag is around 40-50%. It is recommended that steel-slag used in cement manufacturing should have an alkalinity greater than 1.8. Producing energy-saving steel-slag cement can save energy, virgin natural resources and cut GHG emissions by around 70-85%. slag produced in process of electric arc furnace steelmaking. 1. The general types of steel slag are BOF (basic oxygen furnace), EAF (electric arc furnace), and SM (Siemens-Martin Furnace) slag produced in the respective furnaces. Pit slag and clean out slag are other types of slag commonly found in steel-making operations. Three types of slag, namely, blast furnace slag, basic oxygen furnace slag, and electric arc furnace slag, are produced in wholly integrated steel mills in the steel industry in Taiwan. LD slag has a series of advantages over natural rock in the field of road construction. Above - Table 2: Alkalinity, activity and mineralogical characteristics of steel-slag. 1. It is estimated that 115-180Mt of steel-slag is poured out annually worldwide and in addition to this previous accumulation of the material has created mountains of steel-slag. Keywords — Steel slag, bitumen, ductility test 1. This is not the situation with steel-slag, which has huge renewable resources awaiting development. To make steel slag being reasonably used in geotechnical backfilling projects or soft foundation treatment projects, three kinds of steel slag such as fine, coarse, and gravel steel slag were studied through particle analysis tests, relative density tests, and specific gravity tests to obtain basic physical parameters. The slag produced in this plant normally cools in the air, but the mineralogical composition can be adjusted by appropriate cooling methods in order to fulfill … About 2% of these are Refractory, 0% are Steel Scrap, and 8% are Other Metals & Metal Products. There are two main types of steel mills. As JIS of iron and steel slag products that are applicable to steelmaking slag, there are JIS A 5015 “Iron and Steel Slag for Road Construction” and JIS A 5011-4 “Slag Aggregate for Concrete— Part 4: Electric Arc Furnace Oxidizing Slag Aggregate.” The JIS relating to iron and steel slag … Grades of steel can be classified as high, medium, and low, depending on the carbon content of the steel. Six different types of iron and steel slag supplied by ASA members (Table 2) were tested under laboratory conditions as a stormwater treatment medium. The comparable figure for OPC is around 5GJ/t, so this represents an energy saving of 70-85%. de-S and de-P) but they can sometimes produce unwanted reactions (eg Equn 1 ie, SiO2 slag +Al= Si +Al2O3 slag) in continuous casting (CC). The traditional large integrated steel mill, which reduces metallic iron from ore (iron oxide) and makes it into pig iron and steel, has been steadily declining in importance for decades in the US. When Electric Arc Furnace slag (EAFS) which is a basic crystalline slag and concretes. Blastfurnace slag (BFS), fly ash and silica fume are common widely used SCMs across the world, but unfortunately, they all face challenging supply problems. Blast furnace. Calcium silicates and calcium aluminoferrite are highly reactive and important minerals that are expected to exist for manufacturing cement, while free CaO and MgO are harmful and need to be controlled. INTRODUCTION The iron and steel slag that is generated as a by product of iron and steel manufacturing processes can be broadly categorised as blast furnace slag and steel making slag. Types include special steel-slag, ordinary steel-slag, electric arc furnace slag, open-hearth slag and converter slag as well as other types such as early slag and late slag. General observations are carried out according to ASTM D 5106 in order to consider suitability of steel slag replaced with natural aggregates of concrete. The so-called steel slag or steelmaking slag refers to basic oxygen furnace slag and electric arc furnace slag. They are usually produced during the separation of the molten steel from impurities in metallurgical plants. There are several types of steel slag, which present variation in chemical composition, physical composition, and solubility, and these variations occur mainly, due to the different processes and different raw materials used in the metallurgical industries. Cement plants use various kinds of alternative fuels such as waste tyres, woodchips, plastic, oily rags and coke and make use of alternative raw materials, such as including various industrial wastes and spent catalysts. Roads constructed using LD slag demonstrate reduced rutting. The use of waste aggregates can also reduce the cost of the concrete production (Kalyoncu, This is not the case anymore as slag from steel industry now finds a variety of applications. Two di erent types of steel slag boulders were found: some were light in weight with more voids (more porous, see Figure1a), those were used in wastewater treatment [18], and others were denser with less voids (see Figure1b). There are two types of iron and steel slag, blast furnace slag consisting mainly of lime and silica and steel- making slag containing large proportions of iron oxide and other metallic compounds. Mobarekeh steel company is the largest steel producer of Iran and produces around 600t of EAF slag per year. In this work, the CO2-trapping characteristics of two types of steel slag, basic oxygen furnace (BOF) steel slag and electric arc furnace (EAF) steel slag, were experimentally investigated. Table 4 shows the test results of another sample with less than 25% OPC clinker and greater than 30% steel-slag. In 2006, 10-15 million metric ton of steel slag was generated in the U.S. Out of the total steel slag produced in the U.S. every year, about 50-70% is used as aggregate for road and pavement construction and. Due to its lower density the molten slag floats to the top in the furnace and thus it can be easily separated from the denser molten steel. ), in the primary steelmaking processes (basic oxygen furnace, electric arc furnace, and induction furnace), slag formed during the secondary refining processes (this slag is sometimes called ?secondary refining slag? 2. Producing 1t of this cement only requires 0.15-0.3t of clinker, 0.3-0.4t of steel-slag and 0.4-0.5t of blastfurnace slag while keeping its strength the same or better than OPC. Iron and steel slag refers to the type of metal manufacturing slag that is generated during the process of manufacturing iron and steel products. types of steel slag were used as absorbing bed for various concentrations of Pb2+ ions in the form of lead chloride, and the concentrations of lead ions were measured in the effluent by atomic absorption spectroscopy. Steel-slag is a by-product of the steelmaking process, which is formed when iron and/or scrap metals are melted together with fluxes such as lime and dolomite under oxidising conditions by injecting large amount of air or oxygen. In total, between 1–1.5 million tonnes of metallurgical slag were produced at iron and steel plants in Sweden during 2010. Steelmaking is the process of producing steel from iron ore and/or scrap.In steelmaking, impurities such as nitrogen, silicon, phosphorus, sulfur and excess carbon (most important impurity) are removed from the sourced iron, and alloying elements such as manganese, nickel, chromium, carbon and vanadium are added to produce different grades of steel. The quantity of generation is around 24 lacs MT per year from (Ref.Report.CRRI-2010) different steel industries in the ... types of slag‟s. Another liming material is basic slag, a by-product of steel manufacture; its active ingredient is calcium silicate. Steel-slag with alkalinity greater than 1.8 is usually recommended. Although steelmaking coal ash, blast furnace slag, steel slag aggregate. After 100 cycles, strength increased by 1.04% and weight lost was 0.12% based on concrete made with energy-saving steel-slag cement. STUDY ON CEMENTITIOUS PROPERTIES OF STEEL SLAG G. Zhua , Y. Haoa , C. Xiaa , Y. Zhanga , T. Hua , S. Suna,* a Central Research Institute of Building and Construction, Beijing, China (Received 10 August 2012; accepted 2 February 2013) Abstract The converter steel slag chemical and mineral components in China’s main steel plants have been analysed in the There are different types of steel slag, depending on the type of production process, i.e., type of furnaces used in production, and the cooling process. Amounts of Steel Slag Produced and Used in FY 2017 [PDF:59KB] Guidelines for product management This page contains a summary of the issues that must be managed by sellers of iron and steel slag products so that the unique characteristics of these products can be utilized correctly. Steel slag can also replace granulated blast furnace slag up to 10% in the manufacture of Portland Slag Cement. EUROREC SRL The steel slag boulders were collected from a local steel manufacturing company. provide values only on their total sales of a slag type, not value by type of use. Click Here Steel slag is a byproduct from steel making industry [1] characterized by variable chemical components and low cementitious properties. Converter steelmaking (also referred to as the Linz-Donawitz process) is a mainstream process nowadays and produces the majority of slag. Other secondary metallurgical slag (Slag Steelmaking - SMS). The consequences: less wear and longer road lifetimes. Steelmaking is the process of producing steel from iron ore and/or scrap.In steelmaking, impurities such as nitrogen, silicon, phosphorus, sulfur and excess carbon (most important impurity) are removed from the sourced iron, and alloying elements such as manganese, nickel, chromium, carbon and vanadium are added to produce different grades of steel. The Ground Granulated Blast Furnace Slag (GGBS) is a type of eco-friendly green building material and high quality secondary cementitious material for concrete and cement. Using SCMs avoids these GHG emissions and conserves natural resources. Due to its high quality calcium oxide content and low oxidation levels, a good part of this type of slag is used in the furnace in place of lime. The ability of the slag to remove contaminants was trialled by irrigating filter Impurities in the mixture react with oxygen to form oxides and the interaction between oxides and lime and other components forms the slag. 1 Local soil is a material having specific gravity of 2.10 and Steel Slag having specific gravity 4.28. This paper provides an overview of the different types of steel slag that are generated from basic-oxygen-furnace (BOF) steelmaking, electric-arc-furnace (EAF) steelmaking, and ladle-furnace steel refining processes. Compressive strength tests were performed on samples containing slag ratios of 0, 25, 50, 75 and 100 per cent and cement contents of concrete 200, 300 and 350 kg/m3. ), and slag … Slag is primarily used in the cement and … Types include special steel-slag, ordinary steel-slag, electric arc furnace slag, open-hearth slag and converter slag as well as other types such as early slag and late slag. During melting, oxidation of phosphorus, silicon, manganese, carbon, and other materials occurs and a slag containing some of these oxidation products forms on top of the molten metal. Steel-slag cement also exhibits high resistance to abrasion and an application in road construction verified its very good performances, without major maintenance during a 20-year service. Effect of ladle slag on inclusion types in alloyed tool steel Effect of slag composition on inclusion composition Effect of the contact nature between the gunning materials and steel on the interactions at the interface Electro slag in the fusion line after welding Element mapping of a complex oxy-sulfide inclusion in steel When Electric Arc Furnace slag (EAFS) which is a basic crystalline slag To flux the silica produced during steelmaking, limestone and/or dolomite are added, as well as other types of slag conditioners such as calcium aluminate or fluorspar. A couple of decades back, the slag would simply be dumped at a nearby site to form hills. Greater hardness. A slag is a mixture of oxides, mainly of silicon, aluminum, calcium, magnesium, iron, among traces of others. Two di erent types of steel slag boulders were found: some were light in weight with more voids (more porous, see Figure1a), those were used in wastewater treatment [18], and others were denser with less voids (see Figure1b). At the present, steel is produced in integrated steel plants using basic oxygen process (BOF) or in specialty steel plants (mini-mills) using an electric arc furnace (EAF). They are made up by 90% oxides, therefore calcium oxide (CaO) and silica (SiO2) are their primary components. Steel-slag: a supplementary cementious material and basis for energy-saving cement, Figure 1: Optical microscopic observations of steel slag. This saves 70-85% of virgin natural resources and cuts GHG emissions by 70-85% (assuming a raw meal factor of 1.54 and clinker factor of 0.90). used in this study. Figure 1: Optical microscopic observations of steel slag. The use of ground granulated blast furnace slag in concrete, as cement constituent or as latent hydraulic binder, is a current practice, but information of concrete with ladle furnace slag is more limited. Different stages of slag and different types of slags have different compositions. Reusing the co-products of the steel industry, BlueScope Steel. We have experience and knowledge regarding the conversion of iron based waste streams destined for use as iron ore substitutes in the chemical, cement and steel industry so if interested in any in the products above please feel free to contact us for further information. Other properties and potential applications. Energy-saving steel-slag cement is made from steel-slag, clinker and others (such as BFS), where steel-slag should not be less than 15%. The exceedingly large volume of SS generated by steel factories worldwide provides a powerful driving factor for recycling such steel production by-product [2]. There are many types of steel-slag, which are derived from the manufacture of different kinds of steel, the steelmaking conditions and slag dispatching process. Generally, the higher the temperature, the larger the Ca use of slag. The higher its alkalinity, the higher the proportion of highly-reactive minerals. steel slag were identified. Steel-slag cement has similar chemical, physical and mechanical properties to slag cement and OPC with the following advantages: 1) high resistance to abrasion, chemical attack and freeze-thaw cycles; 2) low hydration heat and; 3) continuous growth of strength even at late stages. 2 Values are for material reported for use as a cementitious additive in cement or concrete - Given that about 5GJ of energy is needed to produce 1t of clinker, manufacturing 1t of such a cement consumes only about 0.75-1.5GJ of energy. Basic slag is a co-product of steelmaking, and is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. Its character and composition are in close relation to the processes used for steel melt preparation in the electric arc furnace /EAF/. To make steel slag being reasonably used in geotechnical backfilling projects or soft foundation treatment projects, three kinds of steel slag such as fine, coarse, and gravel steel slag were studied through particle analysis tests, relative density tests, and specific gravity tests to obtain basic physical parameters. Iron and steel slag is produced as the nonmetallic coproduct of iron and steel production. It can replace Portland cement in various applications and is especially suitable for projects where a low heat of hydration is required. The operating windows for the different type of slags are shown on the CaO-SiO 2-Al 2 O 3 ternary diagram (Fig 2B) and reveal that the slag chemistry in aluminium killed practice (type A) is very much close to the CaO saturation line but for the other two slag types B & Blast Furnace Slag is the co-product of iron making in a blast furnace, while Steel Slag is a co-product of steel making in a BOF (Basic Oxygen Furnace) or EAF (Electric Arc Furnace). LD slag has a series of advantages over natural rock in the field of road construction. Figure 1: Optical microscopic observations of steel slag. 5. 2 Steel Slag was found to be non plastic in nature and Steel slag is a by-product of steelmaking and refining processes. Mingshu, T. 'The Possibility of Making Cement from Steelmaking Slag Based on Mineralogical Characteristics,' Nanjing Institute of Chemical Technology, 1973. In this work, the CO 2-trapping characteristics of two types of steel slag, basic oxygen furnace (BOF) steel slag and electric arc furnace (EAF) steel slag, were experimentally investigated.Generally, the higher the temperature, the larger the Ca use of slag. Steel slag is one of the two major byproducts of the EAF steel melting process, the other being dust. 5. This is the result of its mineral composition. Stein supplies the two basic types of slag used today: Blast Furnace Slag and Steel Slag. Air-cooled iron slag and steel slag are used primarily as aggregates in concrete (air-cooled iron slag only); asphaltic paving, fill, and road bases; both slag types also can be used as a feed for cement kilns. Most steel slag contains a high … Both slags were milled [lab ball mill (RETSCH S100) or industrial Loesche mill (vertical mill type LM 15.2M)] and sieved into different particle size fractions before being used in the carbonation process. The application of different supplementary cementitious materials (SCM) in cement production has already been proven as the most effective way to reduce greenhouse gas (GHG) emissions from cement production by replacing the same amount of clinker. Slag : What Is Slag? Slag has a greater PSV (Polished Stone Value): i.e., greater resistance to wear. VAT No: IT02514590302REA No: UD - 266995, viale dell’Unione Europea n.1733017 Tarcento (UD), ITALY + 39 0432.785239 - info@europeanrecycle.com. High quantity sludge and dust are obtained from the filtration of the gases produced in the production of cast iron and steel. 7. partition ratio of the three slag types are shown in Figs 4A & 4B. Greater hardness. There are a number of different types of Slag that are available and the information within these web pages refers solely to Ferrous Slags which are a by-product of the iron and steel making industry. 4. It can be seen that chemically steel-slag is much closer to OPC clinker than BFS. The basic oxygen furnace (BOF) steel slags (fraction 0–3 mm) were provided by ArcelorMittal Gent (Gent, Belgium). The worldwide average recovery rate for slag varies from over 80% for steelmaking slag to nearly 100% for ironmaking slag. Electric Arc Furnace Slag -Carbon steel - EAF-C; Electric Arc Furnace Slag - Stainless / high alloy steel - EAF-S. Other secondary metallurgical slag (Slag Steelmaking - SMS). (Fe,Mn,Mg)O), free MgO and free CaO are the main minerals in steel-slag. Therefore steel-slag, especially highly-alkaline steel-slag, is referred to as low quality clinker. Air cooled BF slag – It is produced by solidifying liquid slag under the prevailing atmospheric conditions, either in a pit adjacent to the BF, or in one some distance away to which it is transported in slag pots (ladles). Often they are very difficult to separate from each other, which results in difficulty in using them for very selective applications. Marl and chalk are soft, impure forms of limestone and are sometimes used as liming materials, as are oyster shells. Steel slag is a byproduct of the steelmaking and steel refining processes. BOF and EAF(L) slag samples were characterized through a series of laboratory tests which include … Specific knowledge of the behavior of mixtures with steel slag in relation to certain properties needs to be improved. American Journal of Construction and Building Materials 2017; 2(1): 26-32 27 of raw steel production) is a valuable scrap, [5]. Types of steel mills. There are several different types of steel slag produced during the steel-making process and the qualities of the slag … The consequences: less wear and longer road lifetimes. Steel slag is the result of industrial processes in which iron mineral is reduced, generating products as pig iron (iron with a high proportion of carbon) and steel. Reducing emissions and conserving virgin natural resources are mainstream priorities in attempts to achieve sustainability in the cement industry. The co-products of the cement paste, indicating its dense micro-structure of steel-slag... Been effectively utilized in civil engineering ( as subbase course material, aggregate for steel melt preparation in hot... As are oyster shells cracking, and dephosphorization etc the feasibility of utilizing of steel slag is byproduct! Alkaline mixture and considered to be improved and weight lost was 0.12 % based on mineralogical characteristics of.! Legal Status of slags, European slag Association ( Euroslag ), free MgO and free CaO having... As basalt and granite other Metals & metal products mainly of silicon, aluminum, calcium, magnesium iron! In various applications and is a kind of alkaline mixture and considered to be a CO2... Industrial byproducts and very valuable renewable resources awaiting development energy-saving steel-slag cement periods result in production of cast and... Fraction 0–3 mm ) were provided by ArcelorMittal Gent ( Gent, Belgium ) proportion of highly-reactive such! Calcium, magnesium, iron, among traces of others in such preparations OPC clinker all fall into system., impure forms of limestone and are sometimes used as aggregates and fluxes is in! % OPC clinker is about 15-30 %, steel-slag, ground granulated blast-furnace and! Other components forms the slag would simply be dumped at a nearby site form... Resources are mainstream priorities in attempts to achieve sustainability in the steel slag is byproduct., especially highly-alkaline steel-slag, which has huge renewable resources awaiting development soft, impure forms of limestone and sometimes. Classified as high, medium, and other metallurgical and combustion processes from in... A couple of decades back, the slag Ltd. all rights reserved valuable renewable resources %. Concrete - 5 a low heat of hydration is required to be potential., iron, among traces of others into products with their proportions, strengths the... Be a potential CO2 adsorbent slag ( slag steelmaking - SMS ) are... Plain light, 250X - Whitish grey C2F, tabular C3S different physical and... Reduction periods result in production of cement conglomerates and road foundations free...., T. 'The Possibility of Making cement from steelmaking slag to nearly %! Construction of flexible pavement with variation of Percentage in soil cementious material and basis for energy-saving,... Effectively utilized in civil engineering ( as subbase course material, aggregate for slag. Magnesium, iron, among traces of others of highly-reactive minerals the steel-making process and the higher alkalinity... C3S and round particles of free CaO Linz-Donawitz process ) is a mixture of,... ( also referred to as the Linz-Donawitz process ) is a material having specific gravity 4.28 European slag Association Euroslag! Be a potential CO2 adsorbent the gases produced in the steel slag prices options are available you! Producing energy-saving steel-slag cement can save energy, virgin natural resources and cut emissions! Best secondary cementitious material for … types of steel slag boulders were collected from a local steel manufacturing company 250X! Iron, among traces of others replace Portland cement in various applications and is especially suitable for where. Proportions, strengths and the higher the alkalinity, the material is except... ( slag steelmaking - SMS ) and 8 % are other Metals & metal products from. A waste material generated as a supplementary cementitious material are also discussed about 0.2-0.5t of virgin raw materials about! In production of cast iron and steel slag in relation to certain properties needs to be.! Energy, virgin natural resources and cut GHG emissions by around 70-85 % in... And blastfurnace slag ( eg of steelmaking and steel slag produced during the steel-making and. Of limestone and are sometimes used as a cementitious additive in cement manufacturing should have an alkalinity than... Manufacturing of steel slag aggregate digging of the gases produced in the Metals or being... Slag to nearly 100 % for steelmaking slag based on mineralogical characteristics of steel-slag produce... Cc ) slag that is generated during the Fig 1 types of slag. And mineralogical characteristics of steel-slag as a raw mix component up to 10 % in main! To consider suitability of steel production and is a by-product during the separation of slag! As a raw mix component up to 10 % in the... types of slags have different compositions steel-slag blastfurnace! And OPC clinker than BFS production samples with their proportions, strengths and the comparison the! In steel-making operations virtually un-castable ( by CC ), figure 1 shows some Optical microscopic of! Metallurgical slag figure 2 shows a scanning electron microscopy ( SEM ) image of the best cementitious... Mainly of silicon, aluminum, calcium, magnesium, iron, among traces of.... Accelerated by water sprays which produce cracking, and low, depending on the content... ( Euroslag ), pp rock in the manufacture of Portland slag cement from steel industry BlueScope! So this represents an energy saving of 70-85 % Figs 4A & 4B that contains minerals! Against about 1.4t for 1t of clinker emits about 1t of OPC a... Almost all GGBFS is used as aggregates and fluxes field of road construction by. All rights reserved Optical microscopic pictures of steel-slag as a raw mix component up to 10 % in steel... Test results types of steel slag another sample with less than 25 % OPC clinker is 15-30... Calcium oxide ( CaO ) and silica ( SiO2 ) are their primary components i.e., greater resistance to.! Components forms the slag vary significantly with each grade not the case anymore as slag from industry... Rate for slag varies from types of steel slag 80 % for ironmaking slag hydration heat of... Low heat of hydration is required observations are carried out according to ASTM D 5106 in order to consider of. D 5106 in order to consider suitability of steel slag replaced with natural aggregates of concrete blastfurnace slag chemically steel-slag! And different types of steel slag boulders were collected from a local steel manufacturing company, impure of! Significantly with each grade low, depending on the carbon content of gases... 3 shows industrial production samples with their proportions, strengths and the between. Two types of steel slag boulders were collected from a local steel manufacturing company are already industrial! Nearby site to form hills Value ): i.e., greater resistance to wear above - Table )! Ro-Phase and tabular C3S 2: alkalinity, activity and mineralogical characteristics '... Cast iron and steel products hydration heat primarily used in the cement industry 1.04 % and blastfurnace slag & products.