Effect of Microstructure on the Granule Strength of Hollow Granulated Mold Fluxes for Continuous Casting

Han, Funian; Wen, Guangrui; Zhang, Fei; Wang, Zhe; Liang, Yu

doi:10.1002/srin.202200480

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Hollow granular mould flux is usually produced by spray drying. 18,19 Before spray drying, raw materials and water are mixed and stirred to make a slurry. The slurry is ejected by a high-pressure spray gun to form tiny droplets.…”

Section: Distribution Of the Original Mineralogical Phase In Flux Amentioning

confidence: 99%

Formation of nepheline in the heating process of mould fluxes and its effect on sintering behaviour

Chen,

Wen,

Yang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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This study explores the formation mechanism of nepheline (NaAlSiO4) in the 500–900 °C heating process of mould flux and the influence of Al-containing materials on the nepheline formation using thermogravimetric-differential scanning calorimetry, scanning electron microscope and X-ray diffraction. The results show that the formation behaviour of nepheline depends on the type of Al2O3-containing materials. At 500 °C, flint clay (Al2SiO5) forms nepheline by solid-state reaction with sodium carbonate (Na2CO3). During the solid-state reaction process, F− improves the kinetic conditions by promoting the diffusion of Na+ into the flint clay particle. F- is derived from the tiny NaF formed by the reaction of cryolite (Na3AlF6) with sodium carbonate. Unlike flint clay, bauxite (Al2O3) reacts with liquid phase at 700 °C to form nepheline. Therefore, the low-temperature sintering of mold flux bauxite-containing is weaker than the flux containing cryolite and flint clay. At 500 °C, the sintered rate of bauxite-containing flux is 22.55%, and the sintered rate of flux containing cryolite and flint clay is 39.50%. With the increase in temperature, the sintered rate of bauxite-containing flux increases, which is gradually close to that of flux containing cryolite and flint clay. Until 900 °C, the sintered rate of bauxite-containing flux (63.45%) is the same as that of flux containing cryolite and flint clay (62.15%).

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Section: Distribution Of the Original Mineralogical Phase In Flux Amentioning

confidence: 99%

Formation of nepheline in the heating process of mould fluxes and its effect on sintering behaviour

Chen,

Wen,

Yang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

Self Cite

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“…At the same time, the shape of the slag circle in the meniscus area also affects the inflow of protective slag. In continuous casting production, it is necessary to control the composition, physical parameters, and heat transfer performance of protective slag to control the formation and growth of the slag ring [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow and Fluctuation Characteristics in Coated Slag Using a 2D Model in the Meniscus Region of Mold

Du,

Zeng,

Wang

et al. 2023

Coatings

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Steel is mainly produced through continuous casting; molten steel flows into the mold from the tundish, where it cools and then enters the secondary cooling zone, ultimately solidifying into a billet. During the continuous casting production process, the quality of the casting billet is mainly related to the lubrication state of the coated slag. In the upper part of the mold, the consumption of liquid protective slag directly affects the friction state of the initial solidified billet shell. Therefore, the flow and fluctuation characteristics of coated slag in the meniscus area are very important. There is limited research on the flow and fluctuation characteristics of coated slag in the meniscus area, and little consideration has been given to the shape of the meniscus. In this work, a two-dimensional numerical model for the flow and fluctuation of coated slag in the meniscus region was established, and the transient flow velocity of protective slag and molten steel at each moment of the vibration cycle was obtained, as well as the fluctuation of the slag/steel interface in the meniscus region. The results show that when the surface mold vibrated upwards, the protective slag in the meniscus area flowed clockwise. When the mold moved downwards, the protective slag in the slag pool generated a counterclockwise flow vortex. When the mold was in a positive slip state, the negative pressure formed by the upward flow of the protective slag on the meniscus and the inertia force of steel liquid pushed the meniscus toward the inner wall of the mold. During negative slip, the flow of coated slag generated positive pressure on the slag/steel interface, pushing the meniscus toward the steel liquid, and at the initial moment of negative slip, the steel liquid overflowed into the slag channel. This model could provide a theoretical basis for the flow control of protective slag.

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“…Up to now, scholars have made significant progress in the heat transfer behavior of the protective slag inside the gaps of the mold and billet [6,7], but research on the heat transfer, especially the flow behavior, of the protective slag on the surface of the steel liquid is relatively scarce. On the basis of considering the influence of carbon combustion rate, impurity evaporation, and particle size of protective slag in the slag layer, Neelakan established a one-dimensional finite element model and calculated and analyzed the Coatings 2023, 13, 1551 2 of 10 mass transfer and heat transfer status in the slag layer [8].…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat Transfer on the Surface of Molten Steel Slag Layer in Continuous Casting Mold

Li,

Wang,

Zheng

2023

Coatings

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Protective slag is coated on the surface of molten steel during continuous casting, the flow and heat transfer state of the protective slag is a decisive factor affecting the inflow and consumption of liquid slag and is also an important prerequisite for stabilizing and improving the quality of continuous casting billets. Based on the Navier Stokes fluid momentum conservation equation and energy equation, a two-dimensional longitudinal numerical model describing the flow/heat transfer of liquid protective slag on the surface of steel is established. The data comes from the equipment parameters and casting process of an arc shaped slab continuous casting machine in a domestic steel plant. The flow field and temperature field distribution of protective slag are calculated and analyzed, and the effects of factors such as slag layer thickness and shear speed on the flow and heat transfer status of the liquid slag layer are discussed. When the bottom shear velocity increases from 0.005 m/s to 0.2 m/s, the maximum flow velocity of liquid slag from the nozzle to the narrow surface in the center area of the model increases from 0.0012 m/s to 0.0617 m/s, and the average longitudinal flow velocity of liquid slag near the nozzle increases from 0.0012 m/s to 0.0627 m/s. The research results provide reference for investigating the complex metallurgical behavior of protective slag.

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Effect of Microstructure on the Granule Strength of Hollow Granulated Mold Fluxes for Continuous Casting

Cited by 4 publications

References 37 publications

Formation of nepheline in the heating process of mould fluxes and its effect on sintering behaviour

Formation of nepheline in the heating process of mould fluxes and its effect on sintering behaviour

Analysis of Flow and Fluctuation Characteristics in Coated Slag Using a 2D Model in the Meniscus Region of Mold

Flow and Heat Transfer on the Surface of Molten Steel Slag Layer in Continuous Casting Mold

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