上升气泡对钢渣界面行为的影响

doi:10.13228/j.boyuan.issn0449-749x.20230306

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Abstract The interfacial contact area between molten steel and slag is one of the key factors influencing the efficiency of chemical reactions. The phenomenon of gas bubbles traversing the steel-slag interface by constructing a physical model of the water-oil system and employing image processing techniques isreconstructed. The study focuses on the effects of bubble size, slag layer density, viscosity, and interfacial tension on the entrainment volume of steel and the area of the steel-slag interface. The results show that as the bubble size increases, both the entrainment volume of steel and their growth rate also increase. When the initial diameter of the bubble increases from 5 mm to 15 mm and 25 mm, the entrainment volume increases by 733.33% and 3611.11%, respectively. As the viscosity of the slag increases and its density decreases, the entrainment volume of steel increases. However, the thickness of the slag layer has a low impact on this phenomenon. The variation in the area of the steel-slag interface caused by the process of bubble traversal is a key focus of attention. It is worth noting that the area of the steel-slag interface exhibits a trend of increasing and then decreasing as the bubble size increases. When the bubble diameter increases from 5 mm to 15 mm and 25 mm, the interface area increases by 312.97% and 113.44%, respectively. When the bubble size is 15 mm, an increase in the density of the oil phase from 0.76 kg/m³ to 0.84 kg/m³ results in a 67.44% increase in the growth rate of the interface area. However, when the viscosity increases from 8.9 mPa·s to 193.5 mPa·s, the growth rate of the interface area decreases by 31.39%. Furthermore, the maximum value of the liquid-liquid interface area grows by 2.96%, falls by 6.05%, and lowers by 9.14%, respectively, when the surface tension of the oil phase, water phase, or water-oil interface increases from 0.03 N/m to 0.06 N/m. Oil-air, water-air, and water-oil interface tension are the order of influence, going from high to low. Combined with secondary refining, the selection of flow rate and slag parameters plays a crucial role in enhancing refining efficiency. However, due to limitations in material properties in experimental studies, it is suggested to use numerical simulation in the future to analyze the effect of each parameter on the entrainment volume of metal and the interface area of steel slag.

Key words： physical model mathematical simulation steel-slag interface rising bubble carried volume interfacial area

Received: 06 June 2020

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	LIU Yong
	CHENG Shusen
	LIU Tong

Cite this article:

LIU Yong,CHENG Shusen,LIU Tong. Influence of a rising bubble on behavior of steel-slag interface[J]. Iron and Steel, 2024, 59(2): 75-84.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230306 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/75

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