Three-Stage Method Energy–Mass Coupling High-Efficiency Utilization Process of High-Temperature Molten Steel Slag

Chen, Weibin; Wang, Minghao; Liu, Huan; Wang, Hao; Wang, Xidong

doi:10.1007/s11663-021-02213-7

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…SS is relatively similar in chemical composition to cement and is able to react with water in a hydration process, which has a certain cementitious effect. Although SS is less cementitious than cement, the energy consumption involved in its production is greatly reduced compared to cement [4,5]. Based on previous studies, Rashad [6,7] summarized the application of SS as a binder or aggregates for mortar or concrete and found that the utilization of steel slag could lead to excellent engineering indicators.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Steel Slag Foam Concrete and Fractal Model for Their Thermal Conductivity

Xiang,

Song,

et al. 2023

Fractal Fract

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The innovation of structural forms and the increase in the energy-saving requirements of buildings have led to higher requirements regarding the application conditions of steel slag foam concrete (SSFC) to ensure that the SSFC has a lower thermal conductivity and sufficient compressive strength, which has become the primary research object. Through a comprehensive consideration of 7 d compressive strength and thermal conductivity, the recommend mix ratio of SSFC was as follows: maximum SS size = 1.18 mm, water–cement ratio = 0.45, replacement rate of SS = 20–30%. Moreover, a theoretical formula was derived to determine thermal conductivity versus porosity based on fractal theory. The measured values of the foam concrete found elsewhere corroborate the fractal relationship regarding thermal conductivity versus porosity. This fractal relationship offers a straightforward and scientifically sound way to forecast the thermal conductivity of SSFC.

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Section: Introductionmentioning

confidence: 99%

Preparation of Steel Slag Foam Concrete and Fractal Model for Their Thermal Conductivity

Xiang,

Song,

et al. 2023

Fractal Fract

Self Cite

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“…[ 3–5 ] Therefore, the effective utilization of steel slag is an urgent issue to achieve the emission reduction in metallurgy industry. [ 6–9 ]…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Therefore, the effective utilization of steel slag is an urgent issue to achieve the emission reduction in metallurgy industry. [6][7][8][9] Hot steel slag with temperature over 1773 K carries a lot of high-grade physical heat, and thus adding modifiers into the hot slag to make the slag modification through utilizing waste heat can significantly improve the physicochemical property of hot slag and stabilization of free CaO and MgO, which is needed for the valuable element recycling and steel slag valorization. During the hot slag modification stage, the temperature control of hot slag is one of the major factors contributing towards the modification effect of hot slag.…”

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confidence: 99%

Heat Transfer Characteristics of Hot Slag Modification in a Mechanically Agitated Slag Pot

Zhang

Wang

Chen

2022

steel research int.

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Steel slag is a by-product from the steelmaking process, and its yield is about 10-15% of steel production. [1] Steel slag, which contains a lot of valuable elements including Fe, Mn, Ca, Mg, Si, etc, can be reused as the raw materials for the metal recovery, engineering backfilling, road construction, sewage treatment and glass-ceramics preparation. [2] However, the reuse ratio of steel slag is still low due to volume expansion caused by the presence of free CaO and MgO in steel slag. [3][4][5] Therefore, the effective utilization of steel slag is an urgent issue to achieve the emission reduction in metallurgy industry. [6][7][8][9] Hot steel slag with temperature over 1773 K carries a lot of high-grade physical heat, and thus adding modifiers into the hot slag to make the slag modification through utilizing waste heat can significantly improve the physicochemical property of hot slag and stabilization of free CaO and MgO, which is needed for the valuable element recycling and steel slag valorization. During the hot slag modification stage, the temperature control of hot slag is one of the major factors contributing towards the modification effect of hot slag. The rapid temperature drop of hot slag surface may cause the uneven temperature distribution of hot slag and premature solidification on hot slag surface, which is detrimental to the modifier addition. Mechanical stirring is considered as an effective way to promote the temperature distribution uniformity of hot slag and intensive mixing between hot slag and modifiers, which is beneficial to improve the dynamic conditions of hot slag modification. Meanwhile, mechanical stirring can prevent the surface of hot slag from solidification and crusting, so as to facilitate the modifier addition and modification of hot slag.The heat transfer behavior of hot slag is complicated including forced convection and conduction heat transfer in hot slag, fluidsolid phase coupling heat transfer between hot slag and pot wall, natural convection and radiation heat transfer through the pot wall and hot slag surface. Up to now, metallurgists have conducted many researches on the thermal behavior of high temperature molten melt in metallurgical process. [10][11][12][13][14] Lu et al. [15] studied the effect of different casting parameters on the flow and heat transfer of hot slag, but the surface temperature of hot slag was assumed to be constant, which may lead to a large error in the simulation results. Li et al. [16] investigated the temperature variation of hot slag and the heat loss through slag surface at different preheating temperatures in a slag pot, but the convection effect of hot slag was ignored. Tripathi et al. [17] developed a mathematical model for the temperature prediction of ladles and molten steel during the whole process cycle of ladles, and the effects of various factors on the temperature drop were

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Recycling of ironmaking and steelmaking slags in Japan and China

Matsuura

Yang

et al. 2022

Int J Miner Metall Mater

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The mass production of steel is inevitably accompanied by large quantities of slags. The treatment of ironmaking and steelmaking slags is a great challenge in the sustainable development of the steel industry. Japan and China are two major steel producing countries that have placed a large emphasis on developing new technologies to decrease slag emission or promote slag valorization. Slags are almost completely reused or recycled in Japan. However, due to stagnant infrastructural investments, future applications of slags in conventional sectors are expected to be difficult. Exploring new functions or applications of slags has become a research priority in Japan. For example, the utilization of steelmaking slags in offshore seabeds to create marine forests is under development. China is the top steel producer in the world. The utilization ratios of ironmaking and steelmaking slags have risen steadily in recent years, driven largely by technological advances. For example, hot stage processing of slags for materials as well as heat recovery techniques has been widely applied in steel plants with good results. However, increasing the utilization ratio of basic oxygen furnace slags remains a major challenge. Technological innovations in slag recycling are crucial for the steel industries in Japan and China. Here, the current status and developing trends of utilization technologies of slags in both countries are reviewed.

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Three-Stage Method Energy–Mass Coupling High-Efficiency Utilization Process of High-Temperature Molten Steel Slag

Cited by 8 publications

References 44 publications

Preparation of Steel Slag Foam Concrete and Fractal Model for Their Thermal Conductivity

Preparation of Steel Slag Foam Concrete and Fractal Model for Their Thermal Conductivity

Heat Transfer Characteristics of Hot Slag Modification in a Mechanically Agitated Slag Pot

Recycling of ironmaking and steelmaking slags in Japan and China

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