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The existing steel slag processing technology used in China and its current state,including different types of technology and its principle,are briefly introduced in this paper.Three types of treatment process for slag,i.e.hot stew method,wind crush method and drum method …
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Blast furnace slag is mainly used as building materials and their products [11], such as: cement mix, gypsum, blast furnace slag micronised powder, admixture for concrete, …
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The results revealed that the surface morphology of the SSA changed due to steel slag pre-treatment, and the roughness increased, which enhanced the adhesion performance with the asphalt binder. In addition, the polymer membrane created by SCA improved the cohesion between the SSA and binder, which was crucial for improving the …
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Article 24 September 2021. A Review on Environmental Concerns and Technological Innovations for the Valorization of Steel Industry Slag. Article 20 …
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For magnesium slag samples subjected to high-temperature treatment, the F content is 54.1–163.0 mg/kg for the leachate from acid leaching solution and 4.9–74.6 mg/kg for leachate from neutral leach solution, the former higher than the latter. Thus, the acid leach solution can favor F leaching from magnesium slag.
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1. Introduction. Molten blast furnace (BF) slag with critically high discharged temperature of 1450–1650 °C [1] contains thermal energy of about 1770 MJ/t [2].Air cooled and water quenching methods are the main methods for slag treatment [3], which produce air cooled BF slag (ACBF) and granulated BF slag (GBF), respectively.Globally, nearly …
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The activation of waste slag via carbonation treatment, and their further application to replace cement clinker as SCMs generate enormous environmental benefits, including the reduction of energy consumption, resources excavation, and CO 2 emissions (Viebahn et al., 2007; Khoo et al., 2011; Zapp et al., 2012).
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The invention provides a method for reducing the viscosity of high-temperature steel slag and improving the wind crushing treatment proportion, which is characterized in that the alkalinity, the temperature and the components of the steel slag are regulated and controlled on line by analyzing key factors influencing the fluidity of the steel slag and …
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In this paper, we reviewed steel slag treatment, recycling, and management in China. Although China's annual slag production reached more than 100 million tons, its utilization rate is only 29.5% ...
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After treatment with oxalic acid, the crush resistance of steel slag is improved, and the abrasion value and crush value are reduced by 27.7% and 7.9%, respectively. With increasing water erosion time, the crush resistance of steel slag before and after treatment showed a decreasing trend, but the abrasion and crush value of …
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Steel slag is calciumsilicatic, with a CaO range of 38–48%, and it has a SiO 2 range of 11–20%. The Fe in steel slag is in the form of steel, FeO, and iron-bearing minerals. These components can be separated from the steel slag by magnetic separation for the sinter and blast furnace or may be used in steelmaking.
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Advantages: fast slag discharge, small footprint, low pollution, stable slag particle performance. Disadvantages: steel slag grain size is large, uneven (>9.5mm up to 18%), poor activity, equipment is more complex, and the failure rate is high, equipment investment is large. Can only handle liquid slag.
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Covering the surface of BOF slag is another treatment that has been applied by Chen et al. . The fully hydrated slag was immersed in silicon resin for 1 h and then cured in an oven at 60 °C for 24 h. The process needs to be repeated for three cycles. The study evaluated slag's viability as an aggregate for use in asphalt mixes.
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The slag from water quenching is dealt with processes introduced in SII. The crushed slag treated with wind quenching is so small that no further smashing is needed and iron is fully separated from slag. Only a two-magnetic process is needed to recycle iron. Most of the iron recycled could return to the BOF smelting process directly.
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Steel slag (SS), accounting for about 15–20% of the total steel amount, has been produced in huge quantities worldwide (Han et al., 2015; Shi, 2004).Initially, SS was treated as a waste material and disposed of as landfill, which not only took up land resources but also severely impacted the natural environment and human health due to …
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After treatment with oxalic acid, the crush resistance of steel slag is improved, and the abrasion value and crush value are reduced by 27.7% and 7.9%, respectively. With increasing water erosion time, the crush resistance of steel slag before and after treatment showed a decreasing trend, but the abrasion and crush value of …
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This study aims to assess the effectiveness of alkali-activated slag in controlling wind erosion in soil. To evaluate erodibility, soil samples treated with varying …
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After BOF slag was oxidized at 1300 ℃ for 240 min and cooled in the furnace (1 ℃/min), the grade of magnetic slag obtained by magnetic separation had a grade of 40.26%, a recovery of 70.95% ...
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Slag has high strength because of its rough texture. It hardens well, enabling a thinner layer of pavement than what can be achieved by natural stones. Slag is considered hardy due to its resistance to weather and wear. Slag has a MOHS hardness value of 6 compared to granite 4 and limestone 3. Its hardness makes it more durable.
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Copper slag, a waste solid produced in the copper smelting process, is a high-quality secondary resource with huge output. The recycling and utilization of copper slag is of great interest because it avoids the loss of valuable metals and the threat of harmful metals, and saves a lot of natural resources and energy. This paper firstly …
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2.1. Acid/alkali pretreatment of metallurgical slag. Acid treatment as a common pretreatment method for metallurgical slag usually used sulfuric acid (H 2 SO 4), hydrochloric acid (HCl) and nitric acid (HNO 3).The added acidic solution can react with the alkaline substances in the metallurgical slag, increase the specific surface and pore …
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In general, phosphate cements have a very rapid setting reaction at room temperature. The same holds for copper slag-based phosphate cements. This means that using them as a binder, for instance as mortar, is always possible on a small scale, but very difficult on a large scale. In this paper, the heat treatment of the copper slag was shown …
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Best result is achieved for K-BOP slag at 7% crystal water content, and the stabilized stainless steel slag after 3 months aging period becomes equivalent to blast furnace slag in its quality ...
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About EAF Slag. EAF slag is a rock-like material generated during the steel-making process. Approximately 130 facilities across the United States generate EAF slag. EAF slag is used as an alternative to rock fragments, both in encapsulated uses (e.g., contained in concrete) and unencapsulated uses (e.g., loose ground cover material).
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These tests were conducted to evaluate the durability and effectiveness of the slag-based alkali-activated crusts in controlling wind erosion under harsh environmental conditions. The experimental setup used for the simulation of UV radiation was comprised of four DUL L BL UVA 36 OSRAM lamps.
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Fig. 4 traces the blast furnace slag allocations according to the regional production, slag treatment and the end uses in selected countries and areas in 2020. The high-temperature BFS emitted from the blast furnace is treated either by water quenching or air cooling. ... rather than crush the slag by centrifugal force exerted by RDA. The final ...
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A Fine Slag Treatment Plant (FSTP) is Sepro's proprietary system for wet processing of fine incinerator bottom ash. Wet treatment is far superior to a conventional "dry" processing of IBA because it is much …
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Slag is the by-product of iron- and steelmaking processes. Normally, around half to one tonne of slag would be generated for yielding one tonne of rolled iron or steel (Lobato et al. 2015).It was reported that the world steel production was 1.9 billion tonnes in 2016, which suggested that at least around 1 billion tonnes of slag is produced during the …
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To overcome the difficulty in the direct reduction of Fe2SiO4 in nickel slag, the isothermal oxidation of the nickel slag was conducted between 300 and 1000 °C. Its morphology and phase composition after oxidation at 300–1000 °C for 5–30 min are analyzed by means of Scanning electron microscopy, X-ray diffraction, and …
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Coupling with the phase evolution, the cooling characteristics of slag particle were worthy of further exploration and clarification. Therefore, a basic condition was studied, in which the cooling air with velocity of 0.2 m/s crossed the particle with a size of 5 mm and an initial temperature of 1673 K. Fig. 2 (a) displays the visualized ...
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