赵忠宇, 赵俊学, 谭泽馨, 屈波樵, 崔雅茹. 含氟连铸保护渣黏度检测与预测模型[J]. 工程科学学报, 2021, 43(4): 529-536. DOI: 10.13374/j.issn2095-9389.2020.05.03.002
引用本文: 赵忠宇, 赵俊学, 谭泽馨, 屈波樵, 崔雅茹. 含氟连铸保护渣黏度检测与预测模型[J]. 工程科学学报, 2021, 43(4): 529-536. DOI: 10.13374/j.issn2095-9389.2020.05.03.002
ZHAO Zhong-yu, ZHAO Jun-xue, TAN Ze-xin, QU Bo-qiao, CUI Ya-ru. Viscosity detection and the estimation model of fluorine-containing mold flux for continuous casting[J]. Chinese Journal of Engineering, 2021, 43(4): 529-536. DOI: 10.13374/j.issn2095-9389.2020.05.03.002
Citation: ZHAO Zhong-yu, ZHAO Jun-xue, TAN Ze-xin, QU Bo-qiao, CUI Ya-ru. Viscosity detection and the estimation model of fluorine-containing mold flux for continuous casting[J]. Chinese Journal of Engineering, 2021, 43(4): 529-536. DOI: 10.13374/j.issn2095-9389.2020.05.03.002

含氟连铸保护渣黏度检测与预测模型

Viscosity detection and the estimation model of fluorine-containing mold flux for continuous casting

  • 摘要: 采用旋转柱体法对不同类型的含氟连铸保护渣黏度进行检测,并基于Arrhenius方程通过非线性回归分析建立了新的黏度预测模型,分析了组分变化对黏度的影响。结合模型计算和实验检测,建立了CaF2‒Na2O‒Al2O3‒CaO‒SiO2‒MgO渣系的等黏度图。结果表明,与传统的含氟连铸保护渣黏度预测模型相比,该模型计算的偏差在10%以内,当渣中w(CaF2)超过20%时,偏差逐渐增大,主要由于氟化物挥发造成炉渣成分变化,最终黏度实测值与炉渣初始成分不符,造成模型无法对黏度有效预测。此外,研究发现,CaF2的增加能显著降低炉渣黏度,而Al2O3和Na2O对黏度的影响受CaF2含量的限制。当w(CaF2)>17%,炉渣黏度随Al2O3含量增加而减小,当w(CaF2)<17%,Al2O3的增加使炉渣黏度显著增大;当w(CaF2)>11.5%,炉渣黏度随Na2O含量增加显著下降,当w(CaF2)<11.5%,Na2O含量变化对黏度的影响并不明显。此外,该等黏度图表明低黏度区w(CaF2)接近14%。通过调整等黏度图中各组分比例,可以改善保护渣的黏度和流动性,供钢铁工业应用。

     

    Abstract: Mold flux plays a significant role in the continuous casting of steel. Especially, the viscosity (or its inverse, fluidity) of mold flux is a key parameter for industrial applications to aid in product quality. In this paper, viscosities of different types of fluorine-containing continuous casting mold fluxes were first measured by the rotating cylinder method, and then a new viscosity estimation model was established based on the Arrhenius equation combined with nonlinear regression analysis to analyze the influence of component changes on the viscosity. Combining model calculation and experimental measurement, an iso-viscosity diagram of the CaF2–Na2O–Al2O3–CaO–SiO2–MgO slag system was also created. It is found that deviation within 10% is calculated using the model in this study compared with the traditional viscosity estimation models of different types of fluorine-containing continuous casting mold fluxes but gradually increases when the w(CaF2) of slag exceeds 20%, mainly due to the change of slag composition caused by fluoride volatilization. Finally, the measured value cannot correspond to the composition of the initial slag, and the model cannot give an accurate estimated value. It is also found that an increase of CaF2 can significantly reduce viscosity, whereas, the effect of Al2O3 and Na2O on viscosity is restricted by CaF2 content. When w(CaF2) > 17%, the viscosity of slag decreases with increasing w(Al2O3), and when w(CaF2) < 17%, the viscosity of slag increases significantly with increasing w(Al2O3). When w(CaF2) > 11.5%, the viscosity of the slag system decreases significantly with increasing w(Na2O) mass. When w(CaF2) < 11.5%, the effect of Na2O on viscosity is not obvious. In addition, the diagram shows that the mass fraction of CaF2 in the low viscosity area is nearly 14%. This shows that the viscosity and fluidity of mold flux can be improved by adjusting the component ratio in this iso-viscosity diagram for applications in the steel industry.

     

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