Calculation of Phase Diagram of CaO-SiO&lt;sub&gt;2&lt;/sub&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-MgO-B&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Refining Slag without CaF&lt;sub&gt;2&lt;/sub&gt;

Liu, Li Xia; Wang, Gang; Wang, Shi Jun; Dong, Yun Chi; Chai, Yi Fan

doi:10.4028/www.scientific.net/amr.512-515.1558

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…One of the ways to solve this problem is to use boron oxide instead of fluorspar. This oxide is able to reduce the crystallization temperature and slag viscosity, providing effective metal desulfurization [9][10][11][12][13][14][15][16]. In addition, when boron oxide is used in the slag, the process of boron reduction occurs [14].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO2-B2O3-MgO-Al2O3 System and the Metal

Бабенко

Смирнов

Уполовникова

2021

DDF

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The equilibrium interfacial distribution of sulfur and boron was estimated using the HSC 6.1 Chemistry software package (Outokumpu) and the simplex-lattice planning method. Adequate mathematical models have been constructed in the form of III degree polynomial, which describe the effect of the composition of the studied oxide system on the equilibrium distribution of sulfur and boron between the slag and the metal. Generalization of the results of experimental studies and thermodynamic modeling made it possible to obtain new data on the influence of the basicity and content of B2O3 in the slag of the CaO-SiO2-B2O3-MgO-Al2O3 system on the interphase distribution of sulfur and boron. It was found that in the range of boron oxide concentration of 1.0-10%, an increase in slag basicity from 2 to 5 at 1600°C leads to an increase in the sulfur distribution coefficient from 1 to 20 and, as a consequence, a decrease in the sulfur content in the metal from 0.02 to 0.0014 %, i.e. an increase in slag basicity favorably affects the development of the metal desulfurization process. An increase in the B2O3 content from 2.0 to 10.0% in slags formed in the region of moderate basicity, not exceeding 2-3, is accompanied at 1600°C by a decrease in the boron interphase distribution coefficient from 450 to 150 and an increase in the boron concentration in the metal from 0.006 to 0.021 %, which indicates the progress of boron reduction from slag to metal. The shift of the formed slags to the area of increased basicity up to 5.0 shows a high degree of boron reduction from slag to metal. The results of the laboratory experiment confirmed the results of thermodynamic modeling.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO2-B2O3-MgO-Al2O3 System and the Metal

Бабенко

Смирнов

Уполовникова

2021

DDF

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Physicochemical properties of the CaO-SiO2-B2O3-MgO-Al2O3 slags system

Уполовникова

Бабенко

Shartdinov

et al. 2022

Proceedings of the 16th International Conference on Industrial Manufacturing and Metallurgy (Icimm 2021)

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Fundamental studies of physicochemical properties of environmentally friendly fluorine-free slags and their use in ladle steel industry

Бабенко

Смирнов

Протопопов

et al. 2022

Izv. vysš. učebn. zaved., Čern. metall.

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The article describes theoretical and experimental studies of dependence of viscosity, coefficients of sulfur and boron distribution between slag and metal, and wear degree of periclase-carbon refractories on basicity and boron oxide content in slag. It is shown that formed slags have basicity of 2.0 – 5.0 and rather high liquid mobility. These slags are characterized by an equilibrium interfacial distribution coefficient of sulfur increased to 5 – 20, which provides equilibrium sulfur content in the metal reduced to 0.001 – 0.005 %. The results of fundamental studies of the physicochemical properties of refining slags of СаО – SiO2 – В2O3 – Al2O3 – MgO system formed the basis for development of the composition of environmentally friendly fluorine-free ladle slags and technological methods for their formation in ladle-furnace unit. The recommended composition of such slags of low viscosity, which allows deep metal desulfurization, direct steel microalloying with boron and low aggressive effect on periclase-carbon refractories, provides formation of slags with a basicity of 3.0 – 4.0, containing 1 – 4 % B2O3 , 15 % Al2O3 and 8 % MgO. The formation of environmentally friendly ladle slags of the recommended composition was carried out in a ladle-furnace by loading lime, boron-containing material – colemanite (Turkey) containing 39 – 41 % B2O3 , 26 – 28 % CaO, not more than 5 % SiO2 and 3 % MgO, and pyramidal aluminum into the steel-teeming ladle for slag deoxidation and boron recovery. Introduction of the developed technology for the formation of ladle slags of recommended composition ensured the production of economically alloyed low-carbon structural boron-containing steels with a low sulfur content, incl. for large diameter pipes with high strength properties.

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Calculation of Phase Diagram of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-MgO-B<sub>2</sub>O<sub>3</sub> Refining Slag without CaF<sub>2</sub>

Cited by 4 publications

References 2 publications

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> System and the Metal

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> System and the Metal

Physicochemical properties of the CaO-SiO2-B2O3-MgO-Al2O3 slags system

Fundamental studies of physicochemical properties of environmentally friendly fluorine-free slags and their use in ladle steel industry

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