Viscosity Measurement of Slags using Rotating Bob and Vibrating Finger Viscometer

Chebykin, Dmitry; Heller, Hans‐Peter; Dubberstein, Tobias; Korobeinikov, Iurii; Volkova, Olena

doi:10.2355/isijinternational.isijint-2016-580

Cited by 21 publications

(10 citation statements)

References 41 publications

(58 reference statements)

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“…1), the rod position above the furnace was recorded via a software NATIONAL INSTRUMENTS Vision Builder 2012 for Automated Inspection. 9) The spindle was centered and adjusted until the obliquity and eccentricity was less than 1.5° and 1.5 mm, respectively, from the axis of rotation before each experiment. 9) (3) The geometrical error of spindle and crucible.…”

Section: Caomentioning

confidence: 99%

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Effect of Crystallization on the Abrupt Viscosity Increase during the Slag Cooling Process

et al. 2018

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The abrupt viscosity increase during the slag cooling process may jeopardize the stability of industrial operation. However, the underlying mechanism has not been completely understood yet. In the present work, the viscosity of basic oxygen furnace (BOF) slags with different additions, i.e. Al 2 O 3 and SiO 2 , was measured via a rotational rheometer. The slag crystallization behavior was observed in-situ via confocal laser scanning microscope (CLSM). Microstructural features, i.e. crystal fraction, shape and size in the slag, were identified through characterizing the water-quenched slag sample. The present results show that the abrupt viscosity increase occurs only when the crystal fraction exceeds a threshold (defined as critical volume fraction of solid, Φ c), at which crystals start to interfere with each other and form solid aggregates/clusters. The critical solid fraction varies between 0.33 and 0.51 for the investigated samples and is found to decrease with increasing crystal aspect ratio, which varies between 1.43 and 2.17 in our samples.

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Section: Caomentioning

confidence: 99%

“…9) The spindle was centered and adjusted until the obliquity and eccentricity was less than 1.5° and 1.5 mm, respectively, from the axis of rotation before each experiment. 9) (3) The geometrical error of spindle and crucible. This was minimized by critically measuring the dimension of crucible and spindle before each measurement.…”

Section: Caomentioning

confidence: 99%

Effect of Crystallization on the Abrupt Viscosity Increase during the Slag Cooling Process

et al. 2018

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“…The experimental procedure of the viscosity measurements used in the present work is the same as that described in the previous works reported in [39,40]. The sample was heated in the induction furnace via indirect heating using the graphite susceptor to the target temperature at a rate of 18-20 • C per minute in order to prevent the boiling of the slag.…”

Section: Methodsmentioning

confidence: 99%

Viscosity of BOF Slag

Kovtun

Korobeinikov

Srishilan

et al. 2020

Metals

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The viscosities of the industrial basic oxygen furnace (BOF) slag with varying compositions of MgO, Al2O3, TiO2, and MnO were continuously measured at a temperature range between 1400 and 1700 °C using the rotating bob method. Three characteristic temperatures for the melting behavior of the BOF slag were investigated using a high-temperature microscope. The solid fraction of the slag was calculated by FactSage 7.2 using the FTOxid database. General observations from the experimental data show that the increase in MgO tends to increase viscosity. However, Al2O3, TiO2, and MnO decrease viscosity up to a certain level, and beyond that, they also increase the viscosity. The measured values of the viscosity of BOF slags were compared and discussed with known data from the literature. Finally, the activation energy of BOF slags with different compositions of MgO, Al2O3, TiO2, and MnO was calculated in the temperature range of industrial operations.

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“…Consequently, the viscosity at 1573 K and the break temperature T Br , which is related to the formation of the first solids in the liquid slag resulting in a substantial increase in viscosity [4,5], are characteristic values for mould slags. Both of the variables are identified from the temperature dependence of the viscosity η [Pa s], which is determined by a rotating bob viscometer at defined cooling rates [4,[6][7][8][9][10]. The break temperature is defined by the intersection of the two tangents of the linearized curve branches within a logarithmic plot of viscosity versus the reciprocal Kelvin temperature [K −1 ] [11].…”

Section: Introductionmentioning

confidence: 99%

Automated break temperature determination of mould slags for the continuous casting of steel based on temperature-dependent viscosity data

Kölbl

Harmuth

2019

Ironmaking & Steelmaking

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The continuous casting process of steels is mainly influenced by the infiltration of mould slag into the gap between the strand and the mould and the temperature-dependent solidification behaviour of the slag. Thus, measurements of the temperature-dependent viscosity and the determination of the break temperature, TBr, which is related to the formation of the first solids in the liquid slag, based on the recorded viscosity data are essential to characterizing mould slags. To enable automatic, person-independent data analysis method, a procedure must be developed that calculates TBr based on the log η versus 1/T representation. This aim was achieved by detecting the maximum absolute value of the second derivative of log η after regression and relating the associated temperature to TBr; comparisons between these values and the manually determined values showed good agreement. Furthermore, the error was assessed by statistical analysis and the effect of sampling frequency was analysed.

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Viscosity Measurement of Slags using Rotating Bob and Vibrating Finger Viscometer

Cited by 21 publications

References 41 publications

Effect of Crystallization on the Abrupt Viscosity Increase during the Slag Cooling Process

Effect of Crystallization on the Abrupt Viscosity Increase during the Slag Cooling Process

Viscosity of BOF Slag

Automated break temperature determination of mould slags for the continuous casting of steel based on temperature-dependent viscosity data

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