Viscosities of the Quaternary Al2O3‐CaO‐MgO‐SiO2 Slags

Song, Minho; Shu, Qifeng; Sichen, Du

doi:10.1002/srin.201000150

Cited by 52 publications

(46 citation statements)

References 21 publications

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“…It decreases about 40% in average with increasing C/S ratio from 2.0 to 10 at Al2O3=27(±1) wt%. It is clearly noticeable that a tendency of decrease in the viscosity of the melts with increasing C/S ratio is in good agreement with the previous results for the viscosity of similar (but CaF2-free) slag systems measured by Song et al 25) Moreover, it is confirmed that the effect of CaF2 on the viscosity of slags is more significant at lower temperatures. 15,26) Comparing Figs.…”

Section: Effect Of Cao/sio2supporting

confidence: 91%

Structure-Viscosity Relationship of Low-silica Calcium Aluminosilicate Melts

Kim¹,

Park²

2014

ISIJ Int.

153

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The structure-viscosity relationship of the low-silica (SiO2 ≤ 10 wt%) calcium aluminosilicate melts, which represent the secondary refining ladle slag systems, was investigated by employing the rotatingcylinder viscosity measurement in conjunction with the Raman spectroscopy measurement for linking the macroscopic thermophysical property and molecular (ionic) structural information. Furthermore, the influence of CaF2 on the structure-property relationship was explored. The viscosity of low-silica calcium aluminosilicate melts decreased with increasing both CaO/Al2O3 and CaO/SiO2 ratios. However, the effect of the former on the viscosity of low-silica calcium aluminosilicate melts was larger than that of the latter. By employing the Neuville's structure model, in which the silicate structural units with various NBO, i.e. Q n Si are located at the boundary of the AlO4 aluminate, and the Raman scattering data of the glass samples, it was demonstrated that the aluminate and silicate units are more effectively modified by increasing the CaO/Al2O3 ratio at fixed silica content. The addition of small amounts of CaF2 (~5 wt%) to the low-silica calcium aluminosilicate melts decreased the viscosity of the melts. From the analysis of Raman scattering data, the liberation of SiO4 4-(Q 0 Si) units from the AlO4 aluminate structure by addition of CaF2 was understood. However, the effect of CaF2 addition on the viscosity became less discernible at higher CaF2 content (≥ 10 wt%) region, where the F ions simply substitute for the non-bridging oxygen ions in AlO4 tetrahedra.KEY WORDS: structure; viscosity; low-silica calcium aluminosilicate; ladle slag; Raman spectroscopy; thermophysical property; non-bridging oxygen (NBO); calcium fluoride (CaF2).

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Section: Effect Of Cao/sio2supporting

confidence: 91%

Structure-Viscosity Relationship of Low-silica Calcium Aluminosilicate Melts

Kim¹,

Park²

2014

ISIJ Int.

153

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“…Forsbacka et al [14] measured the viscosity of the synthetic slag with relatively low CaO concentrations of interest to the ferrochromium production. Song et al [15] investigated viscosities for the highly basic slag used for secondary refining process in steelmaking. Machin et al [16][17][18][19] investigated a wide range of compositions in the Al 2 O 3 -CaO-MgO-SiO 2 system focusing on the role of alumina and chargecompensation effect on viscosity.…”

Section: Review Of Experimental Datamentioning

confidence: 99%

“…The current article outlines development of the revised viscosity model [1] for the Al 2 O 3 -CaOMgO-SiO 2 slag system, which is a key slag system for a number of metallurgical processes including ironmaking and steelmaking. A number of viscosity measurements has been carried out for this system [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and its subsystems. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] A critical review of experimental procedures and selection of reliable experimental data is an essential stage of the model development.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Chemical Viscosity Model for Fully Liquid Slag in the Al2O3-CaO-MgO-SiO2 System. Part II: Evaluation of Slag Viscosities

Suzuki

Jak

2013

Metall Mater Trans B

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A model is presented that enables viscosities to be predicted reliably over the whole range of compositions and temperatures in the Al 2 O 3 -CaO-MgO-SiO 2 slag system above liquidus in the temperature range from 1543 K to 2643 K (1270°C to 2370°C). Experimental procedures and data from the studies reported in the literature have been collected and critically reviewed with particular attention to the viscometry methods and possible contamination of slag samples to select reliable data points for further model development. Relevant revised formalism to describe the complex viscosity trends including charge-compensation effect of the Ca 2+ and Mg 2+ cations on the formation of tetrahedrally coordinated Al 3+ was introduced. Parameters of the quasi-chemical viscosity model have been optimized to reproduce within experimental uncertainties most of the selected experimental data in the Al 2 O 3 -CaO-MgO-SiO 2 system and all subsystems. This study is part of the overall development of the self-consistent viscosity model of the Al 2 O 3 -CaO-FeO-Fe 2 O 3 -MgO-Na 2 O-SiO 2 multicomponent slag system.

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“…[10][11][12][13][14][15] In order to improve the properties of slag containing high Al 2 O 3 content, some researchers have investigated the effect of MgO addition on the viscosity. 16) In CaO-MgO-SiO 2 -Al 2 O 3 slag system, the viscosity decreases firstly and then increases with increasing MgO content. 17 The above phenomenon can also be verified by the infrared spectra.…”

Section: Introductionmentioning

confidence: 97%