WEBNov 23, 2023 · The conversion of iron to steel results in different types of steel slags. ... Tailoring activation methods to specific LF slag characteristics and testing their impact through laboratory trials is crucial for optimal compressive strength improvement. ... Altun and Yılmaz 79 studied the effect of adding LF slag to Portland cement and used it ...
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WEBDec 26, 2023 · The iron and steelmaking industry accounts for approximately 7% of the anthropogenic carbon dioxide emissions [].In recent years, initiatives to move away from the carbonintensive blast furnace (BF) route have emerged; one such initiative is HYBRIT [].An impliion of this transition to hydrogenbased reduction processes is a change in future .
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WEBApr 1, 2024 · Hong et al. investigated the impact of parameters such as the temperature, L/S ratio, pH, and particle size of slag on improving the leaching efficiency of BOF slag. Under the conditions of an L/S ratio of 20 and a stirring rate of 300 rpm, leaching reactions were conducted using 1 M HNO 3 at temperatures of 25, 30, and 40 °C.
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WEBSep 6, 2018 · We investigated the effect of direct reduced iron (DRI) addition on dephosphorization of molten steel by electric arc furnace (EAF) slag at 1823 K (1550 °C). Various phenomena such as CO gas evolution and slagmaking by gangue oxides in DRI were experimentally observed at each reaction step. Thermodynamic behaviors of .
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WEBJul 1, 2002 · Initially, at a steel mill, iron ore, flux, and fuel (coke) are added into an oxygen blast furnace. The materials combine and react to form liquid hot metal, gasses, and blast furnace (ironmaking) slag. Blast furnace slags typically contain –% iron (NSA, 2000) and are commonly used for appliions such as industrial aggregates, cement ...
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WEBMar 22, 2023 · The size of the ball in a ball mill has a significant effect on the mill's performance, including the production rate, material grindability, and power consumption. Large balls generally result ...
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WEBJan 8, 2024 · This study investigates the alterations in the ratios of components such as class C fly ash (FA), blast furnace slag (BFS), and waste stone powder (WSP) types of limestone powder (LP) used in the production of geopolymer concrete. These components are meticulously examined concerning the physical and mechanical attributes of .
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WEBApr 24, 2022 · This shows that adding slag could satisfy the role of the accelerator at the initial stage, whereas, at 28 days, the effect diminished. Replacement of slag notches is the primary outcome ; additionally, the utilization of iron slag in concrete can augment the concrete strength properties .
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WEBSep 14, 2020 · With the impact effect of aerodynamic force, the slag elongates in the axial direction (x direction) and widens in the spanwise direction (z direction), and the bottom region of the slag column becomes thinner and forms a thin liquid film. At the same time, the edge of the liquid film generates strip ligaments which shed off from the edge and ...
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WEBMay 23, 2023 · A mathematical model accounting for unsteady mass transfer across interface of a stationary iron droplet immersed into molten slag was established through the volume of fluid coupled with level set method. The Marangoni effect induced by mass transfer was reproduced successfully, and the hydrodynamic instability phenomena at .
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WEBOct 15, 2023 · The environmental impact of slag utilization strategies is evaluated. ... the energy conservation and emission reduction requirements for the iron and steel metallurgy industry are becoming increasingly strict. Improving steel performance can reduce steel consumption and can, in turn, lower the consumption of resources (, iron ore and ...
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WEBNov 7, 2018 · Natural graphite, on the other hand, produces excellent slag volumes but slow reduction of iron oxide. Slower rates of gas generation and higher surface tension values cause slag to trap gases and sustain ing. Slag ing height is well connected to carbon injection rate and slag chemical properties. Bubble sizes in EAF .
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WEBOct 27, 2023 · The ball mill is a rotating cylindrical vessel with grinding media inside, which is responsible for breaking the ore particles. Grinding media play an important role in the comminution of mineral ores in these mills. This work reviews the appliion of balls in mineral processing as a function of the materials used to manufacture them and the .
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WEBMar 1, 2007 · Two types of blast furnace slag such aircooled slag and granulated slag are being generated from the steel plants. In India around 40% of this slag is produced in the form of granulated slag. The specific gravity of the slag is approximately with its bulk density varying in the range of 1200–1300 kg/m 3.
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WEBMay 1, 2021 · The smelting process can be divided into three stages, namely decomposition of highvalence sulphide, oxidation of sulphide, and matte smelting and slagging reaction (Fig. 1).The efficiency of matte smelting and matteslag separation, as well as the extent of copper losses to slag are mainly affected by the oxidation/reduction .
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WEBJun 3, 2020 · where γ is the degree of metallization of the nickel slag, %; w MFe is the content of metallic iron in the reducing nickel slag, %; and w TFe is the content of total iron in the reducing nickel slag, %.. Microstructure parameters. Mechanical activation has an effect on the lattice size and microstrain of the structure. More importantly, it changes .
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WEBNov 4, 2023 · Slagbased concrete's hardened and fresh properties were affected similarly to traditional concrete under the influence of design variables. Li et al. investigated the factors affecting twopart slagbased concrete and came up with a mixture based on the main variables that affect strength, workability, and setting time. Most of the research ...
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WEBDec 1, 2020 · 1. Introduction. Iron and steel making slags are byproducts of the production of crude (pig) iron and steel. In the region of 320 to 384 million tonnes (Mt) of blast furnace slags (associated with crude iron production) and between 190 and 280 Mt. of steelmaking slags were produced globally in 2019 (USGS, 2020a).These slags have long been a .
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WEBJun 18, 2019 · Emphasis has been given for further research to validate the proposed mechanisms associated with slagmicrobe interactions for increasing soil quality, crop productivity, and mitigating environmental consequences. While evaluating the slag amendment, effects on agriculture and environment, the potential risks, socio .
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WEBThe main use for steel slag and aircooled iron slag are as feed for cement kilns and as aggregates for asphaltic pavement, fill, and road bases. Slag that has been aircooled can also be utilized as a concrete aggregate [5, 8]. Specific characteristics of steel slags could affect the characteristics of materials used in road building.
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WEBJun 1, 2018 · The feed material was dry batch milled for selected periods ranging from 3; 5; 15; 30–90 min. For all the batch tests, the mill feed was kept constant at 1941g and after each duration the mill was stopped and the contents offloaded. This was then followed by separation of the product from the grinding media on a wire mesh.
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WEBNov 13, 2019 · Iron concentrations in the matte as a function of equilibrium oxygen partial pressure; the slag type was adopted as a parameter in the graph; MgO containing slags had et% (MgO), K 2 O containing wt.% (K 2 O), and MgO K 2 O containing and wt.%, respectively. Full size image. Their effect on the iron concentration in .
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WEBSlag is a glassy byproduct of smelting; slag piles can cover tens to hundreds of acres ( to 1 km2) and be over 100 hundred feet (30 m) high. These impacts remain on the landscape until the disturbed areas are stabilized and reclaimed for other uses, such as wildlife habitat or recreation areas, after mining has ceased.
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WEBAug 14, 2020 · Paste backfilling is an incipient underground mine backfill technology in India. It facilitates maximum use of mill tailings with enhanced stability of the underground workings and minimises rehandling of water, as well as provides bulk disposal of mining solid waste. Binder type and dosage plays an important role in paste backfill .
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WEBFeb 3, 2022 · Abstract The metallurgical processes in production of iron and steel from ores produce slags (blast furnace slag and basic oxygen furnace slag), which is usually dumped as solid waste by various steel plants around the world. The present study assessed and estimated the impact of slag dump piling up for the last 60 years on the hydrogeological .
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WEBNov 15, 2022 · The results demonstrate that the grinding process mostly affects the PSD and morphology of steel slag, but has minor effects on the mineral composition and crystallinity. The PSD of steel slag after wetgrinding is always narrower and more uniform than that of steel slag after drygrinding under identical grinding times. The PSD alone. .
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WEBNov 3, 2021 · Schematic diagram of a new technological system for hydrovacuum granulation (HVG) of slag melts. 1—HVG unit; 2—diffusor with a replaceable nozzle (d—functional diameter of the nozzle); 3—dispersion chamber (r, h—radius and height of the work space); 4—impact area of the associated shock wave with the effect of .
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WEBDec 15, 2016 · Iron slag was collected from a local iron and steel rolling mills. It was black in color. ... Khatib [12] studied the impact of slag (granulated ground blast furnace slag) ... It is concluded that replacement of iron slag in concrete gives good effect to its strength properties due to this, the quality of concrete in term of its density and ...
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WEBDissolution characteristics. pH. Due to the effects of the limestone it contains, the pH of iron and steel slag increases to 10 – 12 when it reacts with water, indiing alkalinity that is the same or lower than that of recycled concrete base course material and cementstabilized soil. Because the soil in Japan is generally acidic, the ...
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