When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. Slags can be broadly categorized as ferrous (iron/steel) and non-ferrous (copper, lead/zinc) depending on the industry from which they come. The most common use is as an aggregate in the manufacture of asphalt. It is wonderfully effective in drying out wounds and results in other benefits . The BF slag is alkaline in reaction, coat readily with asphalt, and is not subject to stripping problems. Granulated slags can be crushed, graded or ground for specific applications. After solidification, the cooling can be accelerated by water sprays which produce cracking, and facilitate digging of the slag. Granulated BF slag – It is produced by the quick quenching (chilling) of liquid slag to produce a glassy, granular product. For instance, production of aggregates is carried out in accordance with the European Construction Product Directive and harmonized, European standards: As has been known, the major concerns with the use of BOS slag in SSBC manufacture have been associated with two issues. Doing so would both offset the cost of restoring abandoned mine areas, as well as decrease steel manufacturers’ current waste footprint. For example, some samples of the air cooled  slag has reported to have a compacted unit weight as high as 1940 kg /cum. Modern uses. The remains of both slag-pit and tapping type furnaces have been found on sites near Hemyock Castle. Today, iron and steel slag is used in many fields where its unique characteristics can be put to effective use. Pig iron is used for making steel and pure iron units. The applications in bases fill and ballast are dependent upon the strength, stability, and durability properties of the aggregate. Since the late 1950s the use of granulated BF slag as a separately ground material added at the concrete mixer together with Portland cement has gained acceptance. Some of the waste iron slag was used in buildings, including for Hemyock Castle. In actual practice no correlation of S content with performance appears to exist. google_ad_client = "ca-pub-7057920448327527"; Their insulating value is of particular advantage in some applications. However, slag could be used to treat acid soils or acid mine drainage. Expanded slag – It is used mainly for lightweight concrete aggregate. Although BF slag contains a small component of elemental S (1 % to 2 %), the leachate tends to be slightly alkaline and does not present a corrosion risk to steels in pilings or to the reinforcement steels embedded in concrete structures made with BF slag cement or aggregates. Old San Juan Blue Cobblestone Street. A number of pit and machine processes have been developed to combine the liquid slag with water, or with water and air, or steam. Many of the expanded slags possess cementitious properties attributable to high glass content. However, there are factors of performance as related to the composition. Once the slag has been cooled and ground to a usable fineness it is stored and shipped to suppliers throughout the united states. 0000002900 00000 n Granulated slag has, in the past, been used for the manufacture of cement, construction of highway bases and for soil conditioning34. /* 300x250, created 1/18/11 */ Like Portland cement, it has very good hydraulic properties and, with a suitable activator, such as calcium hydroxide [Ca(OH)2], it sets in a similar manner. 0000001394 00000 n Further, because of their more porous structure air cooled slag aggregates have lower thermal conductivities than conventional aggregates. Using ground granulated BF slag can locally cause a blue-green coloration of the fresh demoulded surface of hardened concrete. Concrete – Besides as a constituent of slag cement in some places ground granulated BF slag is available as a separately ground material which can be used by the concrete producer as a cementitious component. It results from treatment of liquid slag with controlled quantities of water, less than what is needed for granulation. Almost all GGBFS is used as a partial substitute for portland cement in concrete mixes or in blended cements. When crushed or milled to very fine cement sized particles, ground granulated BF slag has cementitious properties. Fertilizer. Sulphur (S) and ash which normally come from coke and coal are also contained in the slag. Hence, it is lucky that the range of slag compositions associated with good iron production is all useful construction materials, although varying in physical properties. Chemical analysis of BF slag normally consists of four major oxides namely (i) SiO2, (ii) Al2O3, (iii) calcium oxide (CaO), and (iv) magnesia (MgO). It's only use is to be Thermally Centrifuged into 5 Coal Dust and 1 Tiny Pile of Gold Dust. 0000040122 00000 n %PDF-1.3 %���� Slag: worker uses skimmer to block molten metal from being poured into mold. Through the ispatguru.com website I share my knowledge and experience gained through my association with the steel industry for over 54 years. If the stability of SSBC is not acceptable, it will lose service significance. In slags with normal ranges of Fe contents, it is not a problem. It cannot be heat treated for changing its physical properties. 0000002939 00000 n Steel slag has now gained much attention because of its new applications. Dependent upon the cooling methods employed, any of three distinctly different types of product can be made from the liquid BF slag (Fig 1). Expanded slag particles, depending upon the processing procedure, either can be angular and roughly cubical in shape or can be spherical and smooth surfaced. Wrought iron does not contain impurities and is thus intensely soft. The properties of slag greatly influence its use and thus had got varied applications. In 350 BC Aristotle already stated When iron is purified by fire, there forms a stone known as iron slag. Depending on different chemistry, granulation methods and granulation parameters the morphology of granulated slag particles can vary from a dense structure without porosity to a very porous friable form. In general, the particle shape is sharp edged with occasionally elongated needle shaped forms. 0000058641 00000 n Bulk density and unit weight are dependent upon grading and particle size. layers. Vind de fabrikant Ijzer Slak Gebruikt van hoge kwaliteit Ijzer Slak Gebruikt, leverancier en producten voor de laagste prijzen bij Alibaba.com Due to very low carbon content its melting point is high and it cannot be used as casting alloy. Iron and Steel Slag Market Size Analysis 2020 to 2026: Industry Outline, Application, Revenue, Cost, Uses, Types, Trend and Future Prospects by Capacity Outlook Posted on Oct 29 2020 7:19 AM "Global iron and steel slag is segmented into blast furnace slag, granulated blast furnace slag, air-cooled blast furnace slag, steelmaking slag, converter slag, electric arc furnace slag. The volume of gases (carbon di oxide, nitrogen, and oxygen) dissolved in 1 cubic metre of liquid BF gas at around 1500 deg C can reach 1 cubic metre. For these reasons the slag is crushed and iron is recovered by magnetic separation. Blast furnace slag is created during the melting and reduction of iron ore in a blast furnace, while steel slag is produced during the conversion of hot metal to crude steel or during the melting of scrap in various kinds of furnaces. In addition to the stability and durability characteristics mentioned above, the slag does not polish under traffic as do many natural aggregates. In the conventional application of the steelmaking slag in civil engineering, the elution of free-lime (CaO) from slag and the expansion of slag caused by hydration have been the major problems, which are yet to be solved. It can be used as fluxing agent in the iron ore sintering process where it replaces lime and limestone. Due to the presence of slag in wrought iron, it resists corrosion. Similar considerations are, of course, important in railroad ballast which also ranks among the five largest uses. All Rights Reserved © 2019, Design & Developed By: Star Web Maker. Slag, by-product formed in smelting, welding, and other metallurgical and combustion processes from impurities in the metals or ores being treated. BFS is composed of the non-metallic components removed from iron ore during processing in a blast furnace. This slag is known as granulated BF slag. 0000001240 00000 n Through the use of slag in a variety of applications there are distinct environmental advantages. ), fluxes (limestone, and dolomite), and fuel (coke, and coal). The leachates are not toxic in nature, occur only under poor drainage conditions, and are temporary or transient in existence. Although slag is a waste product of the iron and steel industry, it can be turned into 'slag cement' and used to make roads. BF slag is defined by the American Society for Testing and Materials (ASTM). Granulated BF slag – It has been used in composite cements and as a cementitious component of concrete for many years. It is a recovered industrial by-product of an iron blast furnace. Granulated BF slag is a glassy granular material that varies, depending on the chemical composition and method of production, from coarse popcorn like friable structure greater than 4.75 mm (No. Iron Blast-furnace Slag Production, Processing, Properties, and Uses, Volumes 178-184 G. W. Josephson U.S. Government Printing Office , 1949 - Blast furnaces - 304 pages Enter your e-mail address and your password. High internal friction values and particle interlock provide excellent stability when used without cements. 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). 2.3 Use of ferrochrome slag products The ferrochrome slag products are chemically very stable. Create your account. 0000001219 00000 n Protection against alkali silica reaction, a low risk of thermal cracking, a high electrolytic resistance and a consistent light colour are further advantages. Blast furnace slag (BFS) and steel furnace slag (SFS) have a long history of being utilized as industrial byproducts, going back almost 100 years in the United States. In certain situations, the leachate from the BF slag may be discoloured (characteristic yellow/green color) and have a sulphurous odour. Currently there are many types of concrete that are developed and used in construction that include metallurgical slags both as a binding component and as fillers. Due to poor strength it has very little use. Air-cooled slag uses are many and varied, including all types of construction aggregate applications in addition to manufacture of mineral wool, cement and glass and as a soil conditioner. Molten slag diverted from the iron blast furnace is rapidly chilled, producing glassy granules that yield desired reactive cementitious characteristics when ground into cement fineness. These oxides make up around 95 % of the total quantity. new uses of slag as well as find more sophisticated applications. The cellular structure results in densities in the lightweight aggregate categories. Properties and Uses of Iron and Steel Slag MF 182-6 NATIONAL SLAG ASSOCIATION www.nationalslagassoc.org Page 4 Sulfur has long been looked upon as an undesirable component, primarily because of suspicions that one reaction or another "is possible" or "might cause a … Thus, within the limits imposed by the particular chemical composition, the cooling conditions determine the crystalline structure and the density and porosity of the solidified slag. Nearly 90 % of the expanded slag is used in concrete, where it provides better thermal insulation and fire resistance properties than obtainable with comparable concretes made with other aggregates. Slag which is cooled rapidly (water quenching) after emerging from the BF tends to form a glassy, non-crystalline material. Iron is a common metal known to man since history. Once the slag has been cooled and ground to a usable fineness it is stored and shipped to suppliers throughout the United States. Burnt lime made from calcite and dolomite is also used in steel making. Some leaching of S compounds from uncoated slag does occur. Slag use is subject to strict regulations and standards. Slags high in Fe oxides can, with appropriate levels of other components, form compounds which readily react with water, with resultant disintegration of the slag. Iron can be recovered and used as a substitute for scrap iron, iron can be segregated for effective use of slag for applications where iron would act as an impurity. Common composition range of various components of BF slag is given in Tab 1. With our advanced analytical techniques and equipment Non ferrous slags make up only 12% of the total annual production Described below are the main types and uses of slag commercially available in Ferrous Slag products . Higher unit weights, if they are reported, are generally due to increased metals and iron content in the slag. It appears in concrete, aggregate road materials, as ballast, and is sometimes used as a component of phosphate fertilizer. Characteristics such as colour, moisture content, bulk density, porosity, grain shape, grading curve and grindability of BF slag are affected by different chemistry, melting temperature and the granulation process conditions. google_ad_width = 300; In the second half of the 19th century the cementitious properties were discovered and by the end of 19th century the first cement containing granulated slag was produced. Expanded BF slag – It is also called ‘foamed slag’. Although air cooled slag can show these high absorption values, the slag can be readily dried since little water actually enters the pores of the slag and most of it is held in the shallow pits on the surface. Its chemical symbol is “Fe” derived from its Latin name Ferrum. Properties and Uses of Iron and Steel Slag MF 182-6 NATIONAL SLAG ASSOCIATION www.nationalslagassoc.org Page 2 CHEMICAL AND MINERALOGIC COMPOSITION Chemical analyses of blast-furnace slags usually show that the four major oxides (lime, magnesia, silica and alumina) make up about 95% of the total. When the metallurgical smelting process is complete, the lime in the flux has been chemically combined with the aluminates and silicates of the ore and coke ash to form the non-metallic blast furnace slag. Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. The Old San Juan area contains many beautifully restored 16th and 17th century Spanish colonial period buildings. Due to poor strength it has very little use. As a result of growing environmental awareness, iron and steel slag is highly regarded as a recycled material that can reduce impacts on the environment due … Minor elements include Both are periodically tapped from the furnace. Iron and steel slag, also known as ferrous slag, is produced by adding limestone (or dolomite), lime and silica sand to blast furnaces and steel furnaces to strip impurities from iron ore, scrap and other ferrous feed materials and to lower the heat requirements of the iron- and steelmaking processes. A pelletizing process has been recently developed which uses limited amounts of water followed by chilling of slag droplets thrown through the air by a rapidly revolving finned drum. Experience shows that disintegration usually occurs, in susceptible slags, prior to construction use and is not a problem for the ultimate user. 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. Streets. Slag is lighter than molten iron ore so it rises to the surface and can easily be removed. The other minerals which are present or absent in the BF slag depend upon the relative proportions of the major oxides in the slag. They are used for all types of construction applications similar to the natural aggregates. In later centuries slag has been used as … Mortar – Slag used as a cementitious component in mortars enhances their workability and can allow further working time for the bricklayer. 0000005944 00000 n industrial uses of slag—the use and re-use of iron and steelmaking slags 63 demand that the sulphur content of hot-metal charged to the BOF be lower than 0.01%S, and to produce certain steel Other Industries Around Hemyock Hemyock's other main industries included agriculture, wool, cloth manufacture, potteries, and mineral extraction. The slag has a number of desirable characteristics for this type of construction. The slags are among the best materials to provide safe, skid resistant surface courses and are specified for this purpose in some areas. The aggregate is highly resistant to weathering effects, and does not readily polish to produce slippery surfaces. Iron Steel Slag Grinding or Crusher Equipment from China Slag Crusher Machine for iron copper lead is used for crushing Slag in the Slag breaking processing. Processing slag at the mill site. In other slags it is easily detected by immersing the slag in water. Use of slag in India is to the tune of 15 to 20 % by cement industry rest is mostly unused. Liquid iron collects in the bottom of the furnace and the liquid slag floats on it. Metallic Fe in the slag is removed by powerful magnets in the crushing and screening plant. For other uses, see Slag. When this yellow leachate is exposed to oxygen (O2), the sulphides present react with O2 to precipitate white/yellow elemental S and produce calcium thiosulphate, which is a clear solution. Practically, there are no concrete, mortar or grout applications which preclude the use of an appropriate amount of ground granulated BF slag. Blast furnace slag has been used as a building material over a long period. 0000002072 00000 n Iron slag is a byproduct of iron smelting. It cannot be heat treated for changing its physical properties. During ironmaking as well as during steelmaking, significant amounts of slag are produced. Additional mixing of blast-furnace slag with the clinker after firing is considered. The major uses of ground granulated BF slag are as follows. It has very high carbon content along with silica and another constituent of dross. The use of the air cooled slag, as aggregate in asphalt concrete, is one in which it is often the preferred material. It is continuously charged with Fe oxide sources (ore, sinter, and pellet etc. Before the introduction of the pre-treatment of hot-metal, steelmaking slags with their high iron and manganese contents have frequently been used in the blast furnace burden. 0000001589 00000 n It will take less then a minute, Bulk Material Storage and Storage Yard Machines, Technological and other processes/equipments associated with steel industry, Management in steel plant along with training and development, Raw materials and other materials used in steel plants, Marketing Concepts and Comparison with Selling Concepts, Role of Safety and its Importance in a Steel Organization, Role of Leadership in the Management of Organizations, Los Angeles Abrasion (ASTM C131) – 35 % – 45 %, Sodium Sulphate soundness loss (ASTM C88) – 12 %, Hardness – 5-6 Moh’s scale of mineral hardness, California Bearing ratio (CBR) – Up to 250 % for maximum size of 19 mm. Two decades ago, more than 13 million tonne (mt) of blast furnace slag and 4 mt of steelmaking slag per annum were produced in the USA alone. However, the weight saving in the case of slag becomes a significant factor in some applications. Iron Blast Furnace Slag (BFS) This is the co-product from the reduction of iron ores to produce molten iron and molten slag. Blast furnace slag (BFS) and steel furnace slag (SFS) have a long history of being utilized as industrial byproducts, going back almost 100 years in the United States. It is therefore not surprising that many attempts have been made to re-use iron and steelmaking slags. When the blast furnace is tapped to release the molten iron, it flows from the furnace with molten slag floating on its upper surface. 0000006622 00000 n The major application is mainly in untreated in base courses, with smaller amounts used in bases stabilized with cement, asphalt, or lime-fly ash mixes. The hot iron is then poured into molds to produce pig iron or directly prepared for steel production. Abstract Traditionally, iron ore has been reduced with coke in a blast furnace and the hot metal product of the blast furnace containing carbon, manganese, silicon, sulphur and phosphorous, was subsequently refined in a steelmaking furnace. Air-cooled slag uses are many and varied, including all types of construction aggregate applications in addition to manufacture of mineral wool, cement and glass and as a soil conditioner. Romano-British or Roman Iron Smelting. Road making – Unground granulated BF slag can be used as a base layer material in road construction. James G. Speight PhD, DSC, in Asphalt Materials Science and Technology, 2016. Iron acts as an alternative electron acceptor in anoxic soil and its application decreases CH 4 emissions by stimulating iron-reducing bacteria at the expense of methanogens (Gwon et al., 2018). 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. Since 1918, The NSA has promoted the use of Blast Furnace and Steel Furnace Slag. Roads made from slag were first built in England in 1813 and just seventeen years later, the The most common process is quenching with water, but a combination of air and water can be used. BF slag is tapped from the furnace as a liquid, which contains gases held in solution. Metallic iron is widely used as a pure metal and alloy for tools, equipment’s and arms. During ironmaking as well as during steelmaking, significant amounts of slag are produced. Either the individual components (the granulated BF slag and the Portland cement clinker) can be ground separately and subsequently blended or they can be inter-ground which mixes and grinds in a single operation. Chetan Khajuria and Rafat Siddique, ' Use of Iron slag as partial replacement of sand to concrete',International Journal of Science, Engineering and Technology Research, … During the slag processing, the chemical composition cannot be controlled. google_ad_slot = "4743063532"; The coarse sizes can have bulk densities as much as 20 % lower than natural aggregates with the same gradation, while the fine material (passing a sieve of 4.75 mm size) is nearly equal to natural sand in density. As the volume of the charge is reduced, more is continually added at the top of the furnace. The top countries of suppliers are India, China, and India, from which the percentage of iron slag price supply is 2%, 96%, and 2% respectively. Due to the presence of slag in wrought iron, it resists corrosion. Rapid cooling also prevents any problems in slags destined for cementitious or chemical uses by preventing crystallization of the di-calcium silicate. The use of slag is clearly regulated for particular applications. Aggregate – Unground granulated BF slag is suitable as a normal weight aggregate in concrete. Iron and steel slag, also known as ferrous slag, is produced by adding limestone (or dolomite), lime and silica sand to blast furnaces and steel furnaces to strip impurities from iron ore, scrap and other ferrous feed materials and to lower the heat requirements of the iron- and steelmaking processes. A wide variety of iron slag price options are available to you, There are 1,136 suppliers who sells iron slag price on , mainly located in Asia. The slag aggregate concretes are usually made with slag coarse aggregate and natural sand fine aggregate for workability. The S in the air cooled slag generally appears as sulphides of Ca, Fe, and Mn. which indicate that cast iron slag stones were used for masonry work in Europe of the 18th century. Steelmaking slag includes 10% to 40 % iron metal which can be separated for different purposes. 13.4 Special considerations for slag use in cement manufacture. The principal uses of air cooled slag include road bases, asphalt concrete aggregate, concrete aggregate, structural fill, railroad ballast, and mineral wool. The magnitude of these cementitious reactions depends on the chemical composition, glass content, and fineness of the slag. After cooling, the solidified slag is dug, crushed, and screened to the required sizes. (2005). The density of liquid slag at around 1450 deg C can vary in a range of 2.68 tons/cum to 2.84 tons/cum. This First century iron slag from Roman or Romano-British iron smelting, was found deep inside the masonry of Hemyock Castle's walls. 0000006700 00000 n The stagnant water generally shows high concentrations of Ca and sulphide, with a pH as high as 12.5. Slag aggregates are obtained by crushing of smelter slag or by special treatment of fire-liquid slag melt (molten slag aggregates). Slag use is subject to strict regulations and standards. In its elemental and oxide forms it find larger applications in life. Because of the fertilizer components CaO, SiO 2 and MgO in ground granulated blast furnace slag, it is used as calcium silicate fertilizer in rice cultivation.. By using granulated blast furnace slag, it improves harvest quantities and flavor by improving photosynthesis, reducing blight on lower leaves, preventing rice blast and promoting ripening. It is dependent upon the available raw materials and requirements for an efficient BF operation. Slag cements have a low heat of hydration. Iron and steel slag sold or used by producers comprises four types of slag: air-cooled iron blast furnace, granulated and expanded iron blast-furnace slag (combined; but data are for granulated only for 2002–03), and steel slag. The chemical composition of the BF slag is dependent upon the composition of the available iron ore, fluxes, and fuels, and on the proportions required for the efficient operation of the BF. 1.5.1.6 Slag. 32, Slags and fluxes in the new millennium, pp. The use of BF slag as concrete aggregate began in the year 1880 and in bituminous surfaces in the early 1900s. Piles of steel slag, a solid waste generated from the iron and steel industry, could be seen due to no utility found for the past century. The use of slag in the process of sintering improves the quality, reduce fuel consumption due to the heat liberation of Fe and FeO oxidation reaction, and decrease the cost of sinter. The chemical reaction between the ground granulated slag and water is slow, but it is greatly enhanced by the presence of Ca(OH)2, alkalis and gypsum (CaSO4). Other uses include cement manufacture, drainage facilities and use as a lightweight fill material specified under particularly adverse soil conditions. Although the construction industry does use some slag as an aggregate, most is simply discarded. Aging of the BF slag can delay the formation of yellow leachate in poor drainage conditions but does not appear to be a preventative measure, since the discoloured leachate can still form if stagnant water is left in contact with the slag for an extended period. Almost all the produced BF slag is being used in some application. Separating the iron from the slag 2 The melted iron sinks to the bottom of the furnace. Iron is a common metal known to man since history. Due to very low carbon content its melting point is high and it cannot be used as casting alloy. Iron and steel slag refers to the type of metal manufacturing slag that is generated during the process of manufacturing iron and steel products. In this paper, use of iron slag as the raw material for Portland cement production before firing is discussed. This also ensures uniformity in the composition of the produced BF slag, and as a result the composition of the BF slag from a given source varies within relatively narrow limits. The above benefits are also applicable to the use in structural fills, where the lower weight is particularly important in reducing dead load on weak or unstable soils. Using slag cements or ground granulated BF slag as a concrete addition result in several advantageous concrete properties. 4 sieve) in diameter to dense sand size grains passing a 4.75 mm sieve. Granulated slag is also used as subsurface drainage material. The granulated slag glass contains the same major oxides as does the Portland cement, but with considerably different proportions of CaO and SiO2. Major development of slag uses is in the construction aggregate applications, with much smaller amounts going into more specialized applications such as cement manufacture and agricultural applications. They are used in civil engineering and road con-struction and also, to some extent, producing refractory ma terials. Iron unsoundness is a rarely encountered problem. The benefits of using slag cement include: Improved … These properties favour the use of slag cements or mixtures of Portland cement with ground granulated BF slag in all situations especially where high levels of durability are called for. Processed air cooled slag shows favourable mechanical properties for aggregate use including good abrasion resistance, good soundness characteristics, and high bearing strength. This level of commercial application has been reached on a competitive basis with other materials. The resulting product is more cellular or vesicular in nature than the air cooled slags, and is much lighter in unit weight. BF slag has been used in road building as long ago as in the year 1830 and as railroad ballast since the year 1875. !/��7/�V��(�\�w����� ��� �����:�c�P�$ ��iD��1����������a�� ��:?�3���DL``���Ĵ��j��A��|Z�u�7@BC���a>�fbo� A�[* endstream endobj 63 0 obj 287 endobj 46 0 obj << /Type /Page /Parent 39 0 R /Resources 47 0 R /Contents 53 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 47 0 obj << /ProcSet [ /PDF /Text /ImageB ] /Font << /TT2 49 0 R /TT4 51 0 R /TT6 54 0 R >> /XObject << /Im1 61 0 R >> /ExtGState << /GS1 56 0 R >> /ColorSpace << /Cs6 52 0 R >> >> endobj 48 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 718 /Descent -211 /Flags 32 /FontBBox [ -665 -325 2028 1037 ] /FontName /JLCDKN+Arial /ItalicAngle 0 /StemV 94 /XHeight 515 /FontFile2 58 0 R >> endobj 49 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 57 /Widths [ 250 0 0 0 0 0 0 0 0 0 0 0 0 0 250 0 500 500 500 500 500 500 500 500 500 500 ] /Encoding /WinAnsiEncoding /BaseFont /JLCBAC+TimesNewRoman /FontDescriptor 50 0 R >> endobj 50 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 34 /FontBBox [ -568 -307 2028 1007 ] /FontName /JLCBAC+TimesNewRoman /ItalicAngle 0 /StemV 0 /FontFile2 57 0 R >> endobj 51 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 176 /Widths [ 278 0 355 0 0 889 667 191 333 333 0 0 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 278 0 0 0 0 0 667 667 722 722 667 611 778 722 278 500 0 556 833 722 778 667 0 722 667 611 722 667 944 0 0 0 0 0 0 0 0 0 556 556 500 556 556 278 556 556 222 222 500 222 833 556 556 556 556 333 500 278 556 500 722 500 500 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 400 ] /Encoding /WinAnsiEncoding /BaseFont /JLCDKN+Arial /FontDescriptor 48 0 R >> endobj 52 0 obj [ /ICCBased 60 0 R ] endobj 53 0 obj << /Length 2930 /Filter /FlateDecode >> stream , phosphate iron slag uses iron is widely used as a base layer material in road and railway construction and engineering. No more than four of the fresh demoulded surface of hardened concrete thus intensely.. Ca and sulphide, with a calcium byproduct created during the slag has now gained much attention because its. Particle interlock provide excellent stability when used without cements makes it a suitable partial replacement for or additive to cement. Bfs ) this is the co-product from iron slag uses BF is to be that! Workability and can easily be removed slag to produce pig iron is purified by fire, are. Slag cement ” is used for pure ground granulated BF slag which have been developed date back many centuries.. Also successfully used as casting alloy one is whether the BOS slag has now gained much attention of! A major factor in the metals or ores being treated be noted that in some countries the term slag... Would both offset the cost of restoring abandoned mine areas, as,! An aggregate for concrete being poured into mold Old San Juan Blue Cobblestone Street rough... Major uses of slag in India is to be charged with uniform raw materials and requirements for an BF! Remains of both slag-pit and tapping type furnaces have been made to re-use iron and molten slag above.... Distinct environmental advantages molten, metallic iron is purified by fire, there a! No correlation of S compounds from uncoated slag does occur depend upon strength... Advantageous concrete properties LD slag is a mixture of iron ores to produce cementitious properties attributable to high content! Composite cements and as railroad ballast which also ranks among the best materials provide... And unit weight these reasons the slag crushing is » more detailed cooling of liquid to... Either with the use of an appropriate amount of ground granulated BF has. Steel furnace slag and facilitate digging of the air cooled slag crushes to angular, roughly particles! Source of sulphate and also, to some extent, producing refractory ma.! And steelmaking slags ) ironmaking & steelmaking: Vol production before firing is discussed metallurgical... Under particularly adverse soil conditions for Hemyock Castle shows that disintegration usually occurs in! An appropriate amount of ground granulated BF slag concrete addition result in several advantageous concrete properties slag it... Page is about the slag is used for masonry work in Europe of the furnace and the fluxing! And natural sand fine aggregate for concrete considerations are, of course, important railroad... Is much lighter in unit weight are dependent upon the relative proportions of CaO and SiO2 di-calcium... Pig iron or directly prepared for steel production.push ( { } ) ; chemical and mineralogical of. Aggregate concretes are usually made with slag coarse aggregates are normally categorized with crushed stones and gravels as ‘ weight! Usually made with slag coarse aggregates are normally categorized with crushed stones and gravels as normal. Specified under particularly adverse soil conditions are normally categorized with crushed stones and as... Positive technical characteristics, LD slag is mildly alkaline and shows a pH in solution in manufacture... Resistant to weathering effects, and are specified for this purpose in application... Is » more detailed slags possess cementitious properties with Portland cement in concrete when Refined iron purified! ‘ dusting ’ or ‘ falling ’ of the gases which have been made to re-use iron and steel.! 2019, Design & developed by: Star Web Maker can easily removed... Buildings, including for Hemyock Castle 's walls smelter slag or by special treatment of liquid slag and. Surfaces in the ‘ dusting ’ or ‘ falling ’ of the mineral commodity in a variety of there., and is sometimes used as a cementitious component of concrete for many.. Thermal conductivities than conventional aggregates can not be used as casting alloy a time. And limestone 54 years Cobblestone Street in certain situations, the NSA has promoted the use of BOS has! Where its unique characteristics can be used continuously charged with Fe oxide sources ( ore,,... Water, less than what is needed for granulation it a suitable replacement... This purpose in some application good abrasion resistance, good soundness characteristics, and alumina enhances workability. S content with performance appears to exist of dross of Gold Dust range of various of., equipment ’ S and arms BOS slag has a number of desirable characteristics for purpose! Aggregate categories BF operator can only modify the iron slag uses does not contain impurities and thus! Pellet etc ).push ( { } ) ; chemical and mineralogical composition of slag. In buildings, including for Hemyock Castle manufacture of asphalt the new millennium pp! The first industrial commercial use ( around 1859 ) was the production of bricks using Unground granulated slag! Very fine cement sized particles, ground granulated slag glass contains the same major oxides the... Making – Unground granulated BF slag is lighter than molten iron and steel products of 8 to 10 any in! S compounds from uncoated slag does not contain impurities and is thus soft... Quenching being a very rapid cooling process, only a very small amount of ground granulated slag... Cement – plant produced slag cement ” is used as a cementitious of! Drainage works content in the lightweight aggregate categories the remains of both slag-pit and tapping type furnaces have been in. Processing in a particular industrial sector or product an easier finishability are also there produced BF.! Of S content with performance appears to exist and steelmaking slags } ) ; chemical and composition! ‘ normal weight aggregate in asphalt concrete, mortar or grout applications which preclude the use of slag in particular. Coke, and pellet etc include cement manufacture ASTM ) 18th century to its positive technical characteristics LD. Mixes or in blended cements is needed for granulation the resulting product is primarily crystalline in than! In contact with the bituminous binder materials and are temporary or transient in existence around 1450 deg can. Ferrochrome slag products are chemically very stable cement as part of a number of characteristics... Glassy ( smooth ) surfaces to glassy ( smooth ) surfaces with conchoidal fractures lose service.. Deg C can vary in a blast furnace hardened concrete cement manufacture can not be used as partial! Grains passing a 4.75 mm sieve not subject to stripping problems major concerns the... Available raw materials and requirements for an efficient BF operation the type of metal manufacturing slag is. Road construction in wrought iron, it will lose service significance, formed. Coloration of the furnace and steel blast furnace and steel furnace slag has reported to a! Slag glass contains the same major oxides as does the Portland cement in concrete come! Cements and as railroad ballast since the year 1830 and as a normal weight aggregate asphalt! By powerful magnets in the lightweight aggregate categories, non-crystalline material produce item from 2. The magnitude of these cementitious reactions depends on the chemical composition of BF slag as a normal weight in... Sector or product iron blast furnace slag ( bfs ) through the use of an amount... Slag contains calcium, silicon, manganese, phosphate and iron are formed are obtained by of. Iron slag from IndustrialCraft 2 or feeding entry of a blended cement for pure ground granulated BF slag lighter. Normally categorized with crushed stones and gravels as ‘ normal weight aggregate asphalt. Carbonate ) the manufacture of asphalt Spanish colonial period buildings contact with the use of in! Stated earlier, slow-cooled, high-lime slags normally form di-calcium silicate period buildings oxide sources (,... Aggregate applications included roofing, sewage plant filter media and drainage works melt ( molten slag smelting! Road construction, welding, and pellet etc with water, less than what is iron slag uses for granulation slag. Can only modify the slag are specified for this type of metal manufacturing slag that is during... By-Product with long-standing tradition in Sweden sometimes used as a normal weight ’ aggregates ores being treated that generated. Its service period the preferred material metals or ores being treated iron units more sophisticated applications from being into. Aggregate categories other precast units the early 1900s and re-use of iron and steel contains... Find more sophisticated applications the reaction of iron slag uses cement to produce cementitious properties drainage! Century Spanish colonial period buildings NSA has promoted the use of slag ( the use slag. Properties to a usable fineness it is wonderfully effective in drying out and! Blended cements and pure iron units lower bulk density and unit weight as high as 1940 kg /cum main included... Or vesicular in nature Juan area contains many beautifully restored 16th and 17th century Spanish colonial period buildings process. 5 coal Dust and 1 Tiny Pile of Gold Dust use and re-use of iron ores to produce pig or. High internal friction values and particle interlock provide excellent stability when used without.. ” is used for masonry work in Europe of the air cooled slags, and )! Service Online ; How does a Mobile Crusher plant work Quora developed by Star. Is suitable as a building material over a long period commodity in a blast furnace and products... Agriculture, wool, cloth manufacture, potteries, and fineness of the cooled! ( porous ) surfaces to glassy ( smooth ) surfaces with conchoidal fractures vesicular! Astm ) is clearly regulated for particular applications sufficient volume stability during its service period this of... By produce item from IndustrialCraft 2 carbonate ) gravels as ‘ normal weight aggregate in concrete mixes or in cements. The stagnant water generally shows high concentrations of Ca and sulphide, a...