Bubble generation in refractory porous plugs: The role of the ceramic surface composition

Falsetti, Luís Otávio Zaparoli; Muche, Dereck N.F.; Andreeta, Marcello Rubens Barsi; Moreira, M.H.; Pandolfelli, V. C.

doi:10.1002/ces2.10132

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…They pointed out that the number of active sites increases with increasing gas injection flow rate, permeability, the velocity of the downward‐flowing water, and lower contact angle. Falsetti et al [ 13 ] injected gas into liquid media through ceramic capillary structures and studied the influence of the pore size and the contact angle upon the size of the generated bubble. Their results indicated the composition of the ceramic plug's surface could change the contact angle, thus affect the bubble size.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

Qin

Cheng

et al. 2023

steel research int.

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The nonmetallic inclusions in steel, composed of oxides and sulfides, usually act as defects in the metallic matrix and can spoil their mechanical properties. [1] These inclusions have many origins throughout steelmaking and can be classified into two categories. The exogenous ones come from refractory fragments or entrapped slag, and the chemical reactions among steel constituents in the molten pool may produce endogenous inclusions. [2] Cutting down the content of inclusions and improving the purity of liquid steel can not only improve the quality of steel semiproducts but also effectively prevent nozzles from clogging caused by inclusions adhering to the inner wall of nozzle. [3] Argon injection technology, as its excellent effect on the removal of inclusions, has been widely applied in the secondary refining and the continuous casting processes, and some processes, such as gas stirred ladle and gas curtain tundish, have been developed. The mechanism of removing inclusions is that nonmetallic inclusions are not wetted with the liquid steel and can attach on the surface of bubbles after collision and then float up with bubbles to be removed by buoyancy. [4] The wake flow of bubbles and the upward flow of gas plume can also carry the inclusions. [5] The smaller the bubble, the larger the gas-solid contact area, and the higher the inclusions removal efficiency. Therefore, an appropriate bubbling element to get bubbles with an ideal size distribution is the key to removing inclusions from liquid steel.Bubbling elements used in metallurgical process can be divided into three categories: directional permeable bricks, slit permeable bricks, and porous permeable bricks. [6,7] However, the gas supply for directional permeable bricks is unstable, and the flow channels are easy to be clogged at the later stage of use. A slit-permeable brick has poor thermal stability and is easily infiltrated by liquid steel. Moreover, the bubbles formed from it with a relatively larger size are not conducive to the removal of small inclusions in liquid steel. Compared with the former two, the porous permeable brick has better gas permeability, the stable bubble formation ability, and the strong antiscouring performance due to the interconnected pores and complex pore structure inside it. Thus, the porous permeable bricks have a good potential application value and a superior market development prospect in the production of high-quality steel.Recently, the correlation between the interval pore structure of porous permeable bricks and gas permeability has captured much attention of researchers, which determines the metallurgical effects of argon injection technology. Studies of porous permeable bricks mainly focus on the influence of preparation methods, materials type and size, and chemical reactions on the properties of permeable bricks. Zhang et al. [8] utilized SiC whiskers to adjust the property of mullite-corundum gaspermeable refractories and found that the silicon powder content strongly affected the mechanical and gas-permeabilit...

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Section: Introductionmentioning

confidence: 99%

Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

Qin

Cheng

et al. 2023

steel research int.

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“…Cherniak et al [ 11 ] found that the diffusion rate of a light REE was much slower than that of heavy REE, and the diffusion of REE required higher diffusion activation energy. Falsetti et al [ 12 ] studied the effects of ceramic porosity and contact angle on ceramic refractories and found that ceramic refractories in contact with molten steel usually exhibit high contact angles to avoid liquid penetrating the pores. From previous studies, we found that element diffusion had a good relationship with temperature, pressure, and its own physical and chemical properties, which is a good topic for the study of element diffusion.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Lanthanum/Cerium/Manganese in Rare‐Earth Heavy Rail Steel at the Refractory Interface

Wang,

Song,

Shen

et al. 2023

steel research int.

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One of the key factors determining the degree of erosion in the outlet parts of refractory interfaces is diffusion. By studying the representative diffusion behavior of lanthanum, cerium, and manganese in molten rare‐earth high‐carbon heavy rail steel using different refractory interfaces, the diffusion kinetics mechanism of each alloying element is illustrated. The results show that the concentration of diffused lanthanum, cerium, and manganese in rare‐earth high‐carbon heavy rail steel imparts minor changes on the two aluminum–magnesium refractories used in our experiments, whereas the other four refractories show unstable behavior. Furthermore, it is revealed that the smaller the porosity of a refractory material, the greater the decrease in the diffusion channel of each element in molten steel, which in turn increases the diffusion activation barrier and results in slower diffusion. Overall, the suitability degree of the refractory materials tested in experiments for processing molten rare‐earth high‐carbon heavy rail steel with regard to cost, adhesion strength, and erosion degree is as follows: Al2O3–MgO > Al2O3–MgO–SiO2 coating > Al2O3–SiO2–SiO2 coating > Al2O3–SiO2 > Al2O3 > ZrO2.

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Theory of Movement Behavior of Argon Bubbles in Upper Nozzle of Tundish During Argon Blowing Process

Li,

Cheng

et al. 2023

Metall Mater Trans B

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Bubble generation in refractory porous plugs: The role of the ceramic surface composition

Cited by 4 publications

References 42 publications

Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

Diffusion of Lanthanum/Cerium/Manganese in Rare‐Earth Heavy Rail Steel at the Refractory Interface

Theory of Movement Behavior of Argon Bubbles in Upper Nozzle of Tundish During Argon Blowing Process

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