Ground Granulated Blast Furnace Slag GGBS GGBS being the by product from blast furnace contains cementitious properties To develop ultra high performance concrete higher cement content >600kg/m3 is required which in turn results in higher heat of hydration To overcome this and to increase durability cementitious materials such as
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Accordingly the present invention provides an improved process for the production of Portland slag cement using granulated blast furnace slag which comprises viii forming of cement clinker by known process ix ball milling of cement clinker for a period ranging between 30 60 minutes in dry condition x reducing size of granulated blast furnace slag by any process to obtain the size in
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filler on the formation of carboaluminate phases in ground granulated blast furnace slag blended cement pastes was reported in this paper Six different binary and ternary blended cement pastes were prepared using ground granulated blast furnace slag ground oyster shells and limestone filler with different replacement levels from 5 to 35%
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Different forms of BF slag are produced depending on the method used to cool the molten slag These products include air cooled blast furnace slag ACBFS expanded or foamed slag pelletized slag and grand granulated blast furnace slag GGBFS among which ACBFS and GGBFS are the most common 6 Air cooled iron slag is used primarily as
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Slag and its Role in Blast Furnace Ironmaking IspatGuru Aug 07 2024 Slag formation is to be confined to a limited height of the blast furnace and the slag must be stable The slag is to provide good permeability in the zone of slag formation The melting point of the slag is to be neither too high nor too low The final slag is to be fluid
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Blast furnace slag BFS is a by product obtained in the manufacture of pig iron in the blast furnace It taps out from the blast furnace as a molten liquid at a temperature of 1400°C 1500°C and occurs either as a crystalline or granulated form depending on the treatment method for the molten liquid slag
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The Iron Blast Furnace Theory and Practice presents theoretical experimental and operational evidence about the iron blast furnace as well as a mathematical description of its operation This book includes a set of equations that accurately describe stoichiometric and enthalpy balances for the process and which are consistent with observed temperatures and compositions in the furnace stack
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The mixtures were prepared with Na2O dosages of 3 6 and % Compressive strength results showed that the maximum values were found for the dosages of 6 and % at 28 days while in the
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Liquid slag produced in a blast furnace BF is at a temperature of around 1500 C and has a sensible heat of around 400Mcal/ton BF slag is rich in CaO SiO2 Al2O3 and MgO which are similar to the components of Portland cement
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Zone of slag formation takes place at a height of 20m from the base of the blast furnace The temperature here is about 12000K 1500K The temperature here is about 12000K 1500K In this region the flux that is limestone reacts with the impurities such as silicon dioxide and aluminum oxide to form Their respective calcium compounds known as slag
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These slags are highly viscous which affects the gas permeability heat transfer etc In the present work slag viscosity was determined for CaO SiO 2 MgO Al 2 O 3 quaternary system using Iida model Slag composition consists of MgO values between 4 and 10% CaO/SiO 2 between to and Al2O3 25% The temperature range was between 1523 and 1723K which covers the liquidus temperature because
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Phosphate removal using blast furnace slags and opoka mechanisms blast furnace slag and the formation is the predominant P removal mechanism Blast furnace metallurgy Blast furnace Blast furnace a with ascending reducing gases to produce liquid iron and slag that accumulate in of modern blast furnace right and hot blast
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Ground granulated blast furnace slag GGBS manufactured from a by product of the iron making industry is one of the most common and most sustainable substitutes The cementitious properties of blast furnace slag were discovered in the late 19th century and it has been widely used in concrete manufacture for over 100 years In the UK GGBS is usually supplied as a separate component for
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The molten pig iron finally collects in the hearth of the blast furnace together with the slag which is also liquid Due to the higher density of the pig iron the pig iron can be cut off at the lowest point of the blast furnace called tapping It has a high carbon content of about % Further accompanying elements are listed below
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Molten blast furnace slag BFS one of the largest high temperature byproducts remains the last untapped waste heat source in ISI Of ever increasing interest is the centrifugal granulation assisted thermal energy recovery CGATER from high temperature BFS This technique features waste energy harvest and vitreous slag utilization Such striking merit opens up new possibilities of enabling
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The core of the DRI pellet see the microscope image in Figure 10b was almost unmelted consistent with C800 SAF and indicative of lower heat transfer when in contact with a slag Nevertheless bubble formation due to the reaction between carbon and iron oxide could have led to higher turbulence in the surface boundary layer and thus an
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The blast furnace slag should be a freeflowing one at the operating temperatures to ensure efficient slag metal separation It must have appreciable affinity for the gangue constituents to facilitate the production of metal of choice Yet from the available heat in the hearth point of view 1 the blast furnace slag should be neither very viscous nor very fluid In addition a
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A newer Japanese Standard JIS A 5011 1 2024 Slag Aggregate for ConcretePart I Blast Furnace Slag Aggregate was published in 2024 JIS 2024 This is a detailed document describing the use of both ACBFS as coarse aggregate and rapidly cooled blast furnace slag as fine aggregate With regard only to ACBFS the following items are presented
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Sep 14 2020Blast furnace slag BFS is the main by product in ironmaking process As its discharge temperature is between 1450 and 1550 °C each ton of slag contains a large amount of high quality thermal energy which is equivalent to 60 kg standard coal [ 1 2 3 ] Thus there is a great potential for waste heat recovery from high temperature molten slag
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Blast furnace slag is highly reactive Puligilla and Mondal 2024 and fly ash can greatly improve the workability of the mixes owing to its spherical morphology Kutchko and Kim 2024 It is often reported that blends with slag and fly ash provide better mechanical performance than with blast furnace slag alone Wardhono et al 2024
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Deformations of alkali activated slag concrete AASC with high MgO and Al2O3 content subjected to variable curing temperature were studied Sodium silicate and sodium carbonate were used as alkali activators The obtained results showed development
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The Iron Blast Furnace Theory and Practice presents the significant role of iron blast furnace by which iron is efficiently and rapidly reduced from ore and it is the basis for all primary steelmaking This book discusses the importance of blast furnace process as a complete operation Organized into 14 chapters this book begins with an overview of the existing experimental theoretical and
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Abstract Mineralogical evaluation of olivine pellets coated with kaolinite taken from the LKAB experimental blast furnace shows significant reactions with potassium Sampling has revealed strong potassium deposition in pellets in the lower shaft close to the wall but much less deposition towards the furnace centre Iron reduction and the deformation of the pellets were enhanced in the zone
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operation of a blast furnace Heat balance is an account of the input and output of heat in a process which follows the first law of thermodynamics A proper heat balance not only helps to predict the efficiency of a furnace but to also eliminate any excessive fuel wastages Reduced fuel requirement not only reduces production costs but more importantly saves a portion of our rapidly
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Density of High Alumina Blast Furnace Slag In most density models the calculation of slag molar volume is the core step The partial molar volume of CaO SiO 2 MgO Al 2 O 3 TiO 2 components at 1500 °C in few models and the recommended temperature coefficient values are listed in Table
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The material currently used at the Sellafield site is a blend of ground granulated blast furnace slag GGBS and a coarser fraction of the same composition called Calumite combined with Portland cement This work involves future proofing the supply of BFS for the UK nuclear industry by optimising the blend of the two fractions of BFS in order to replicate the unique specification required by
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slag powder and blast furnace slag so the recycling of steel slag can bring enormous benefits and environ mental benefit to whole society [9] 6 Ground granulated blast furnace slag is commonly used in combination with Portland cement in concrete for many applications[10 11] 7 The heat of hydration is dependent on the Portland
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An increased content of MgO within the slag accelerates the kinetics of reaction of sodium carbonate activated slag cements Fig 3A and favours formation of different layered double hydroxides LDHs including hydrotalcite and AFm type phases hemicarbonate C 4 Ac H 12 and/or monocarbonate C 4 AcH 11 Fig 3B depending on the
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Six different binary and ternary blended cement pastes were prepared using ground granulated blast furnace slag ground oyster shells and limestone filler with different replacement levels from 5 to 35% The carboaluminate formation was assessed and quantified directly using X ray diffraction XRD and indirectly by following the aluminate phase s reaction heat flow and consumed calcium
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3 Sensible heat of the hot blast 4 Heat of formation cf the pig iron from its constituents 5 Heat of formation of slag from its oxide constituents 1 and 2 Combustion of carbon in the furnace There is but one satisfactory way to determine with exactness the amounts under this heading From the balance sheet the total
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