Effects of CaO/SiO&lt;sub&gt;2&lt;/sub&gt; on Viscous Behaviors and Structure of CaO-SiO&lt;sub&gt;2&lt;/sub&gt;-11.00wt%MgO-11.00wt%Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-43.00wt%TiO&lt;sub&gt;2&lt;/sub&gt; Slag Systems

Feng, Cong; Tang, Jue; Gao, Lihua; Liu, Zhenggen; Chu, Mansheng

doi:10.2355/isijinternational.isijint-2018-444

Cited by 33 publications

(19 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many researchers have reported that viscosity of slags has closely relationship with structure. 6,34,43,44) In this work, with the increase of CaO/Al 2 O 3 ratio, more excess free oxygen ions (O 2− ) supplied from the dissociation of CaO would lead to a gradual decrease of the bridging oxygen structure (BO) in aluminate structure and an increase of the non-bridging oxygen (NBO) in aluminate structure. This would promote the de-polymerization of aluminate structure, leading to smaller and simpler aluminate structure units.…”

Section: Effects Of the Cao/al 2 O 3 Mass Ratio On Viscositymentioning

confidence: 90%

Structure and Viscosity of CaO–Al2O3–B2O3 Based Mould Fluxes with Varying CaO/Al2O3 Mass Ratios

Chou

Shu

2020

ISIJ Int.

View full text Add to dashboard Cite

The effect of CaO/Al 2 O 3 ratio on the structure of CaO-Al 2 O 3-B 2 O 3 based glassy mould fluxes was investigated by employing 27 Al and 11 B Triple Quantum Magic-angle spinning nuclear magnetic resonance (3QMAS-NMR) and Raman spectroscopy. 27 Al and 11 B 3QMAS-NMR spectrums showed that Al 3 + mainly forms [AlO 4 ] as a network former and B 3 + mainly forms [BO 3 ] groups in CaO-Al 2 O 3-B 2 O 3 based glasses. Raman spectrum showed existences of different [AlO 4 ] structure units and BO 3 pyro-borate units. In addition, deconvolution results on Raman spectrums indicate that the degree of polymerization of aluminate network in CaO-Al 2 O 3-B 2 O 3 based glasses decreases with the increase of CaO/Al 2 O 3 ratio. The effect of CaO/Al 2 O 3 ratio on viscosity of CaO-Al 2 O 3-B 2 O 3 based glassy mould fluxes was investigated by employing the rotating-cylinder method. The viscosity decreases with increasing CaO/Al 2 O 3 ratio in CaO-Al 2 O 3-B 2 O 3 based mould flux. Correlation between viscosity and structural information of investigated mould fluxes was explored. KEY WORDS: structure; viscosity; 3QMAS-NMR; Raman spectroscopy; CaO-Al 2 O 3-B 2 O 3 based mould flux.

show abstract

Section: Effects Of the Cao/al 2 O 3 Mass Ratio On Viscositymentioning

confidence: 90%

Structure and Viscosity of CaO–Al2O3–B2O3 Based Mould Fluxes with Varying CaO/Al2O3 Mass Ratios

Chou

Shu

2020

ISIJ Int.

View full text Add to dashboard Cite

show abstract

“…The application of Raman spectroscopy as an analytical technique is found in some research areas in steelmaking such as for slag structure and viscosities studies. 24,[34][35][36][37][38][39][40][41] The use of Raman spectroscopy has some advantages over other similar methods. The main advantages are because it is a non-destructive technique, it requires low sample volumes and it has a relatively fast detection speed.…”

Section: Time-gated Raman Spectroscopymentioning

confidence: 99%

Applicability of Time-Gated Raman Spectroscopy in the Characterisation of Calcium-Aluminate Inclusions

et al. 2019

View full text Add to dashboard Cite

Calcium aluminate (CaO-Al 2 O 3) phases play a critical role in the study of non-metallic inclusions in aluminium killed, and calcium treated steels. In this study, the Raman spectroscopy technique, a versatile and non-destructive approach, was used to characterise binary calcium aluminate phases qualitatively and quantitatively. Calcium aluminate samples with varying CaO/Al 2 O 3 ratios were synthesised to produce a binary phase samples mixture of C12A7-C3A and C12A7-CA. Quantitative estimation was based on plotting a linear regression calibration model between the ratio of Raman band intensities and the phase fraction in the samples. With the linear regression, the phase fraction of C12A7-C3A and C12A7-CA was estimated with average absolute errors of 2.97 and 2.55 percentage points. This work demonstrates the potential suitability of using Raman spectroscopy technique for evaluating whether calcium aluminate phases in oxide inclusions fall within the liquidus region at steelmaking temperatures.

show abstract

“…area ratios and the Raman scattering coefficient of Q n , the mole fractions of Q n could be calculated by the specified equation [13,37]. Generally, the average amount of non-bridging oxygen (NBO/Si) is used to explain the Si−O network by referring to previous studies [38,39]. NBO/Si is calculated by the mole fractions of Q n multiplied by the amount of its non-bridging oxygen, where lower NBO/Si implies a more polymerized [32][33][34] area ratios and the Raman scattering coefficient of Q n , the mole fractions of Q n could be calculated by the specified equation [13,37].…”

Section: The Network Structurementioning

confidence: 99%

“…NBO/Si is calculated by the mole fractions of Q n multiplied by the amount of its non-bridging oxygen, where lower NBO/Si implies a more polymerized [32][33][34] area ratios and the Raman scattering coefficient of Q n , the mole fractions of Q n could be calculated by the specified equation [13,37]. Generally, the average amount of non-bridging oxygen (NBO/Si) is used to explain the Si−O network by referring to previous studies [38,39]. NBO/Si is calculated by the mole fractions of Q n multiplied by the amount of its non-bridging oxygen, where lower NBO/Si implies a more polymerized Si−O network structure.…”

Section: The Network Structurementioning

confidence: 99%

“…Both the negative center shift of the [SiO 4 ] 4− tetrahedral stretching bands in Figure 6 and the increase of NBO in Figure 9 prove that the Si−O network is depolymerized. As for the Ti−O network, O−(Ti, Si)−O deformation in the sheet unit is considered to be a complex structural unit [28,39], whereas [TiO 4 ] 4− is a short range ordered simple unit [25,40]. The Ti−O network is believed to be simplified with higher MgO content due to its less complex and simpler Ti−O structures, as proven in Figure 9.…”

Section: Correlation Between Viscosity and Network Structurementioning

confidence: 99%

See 1 more Smart Citation

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

Sun

Song

et al. 2019

Metals

View full text Add to dashboard Cite

This research provides fundamental insight into the roles of MgO and Al 2 O 3 on the viscous and structural behaviors of CaO−SiO 2 −MgO−Al 2 O 3 −10 mass% TiO 2 −5 mass% FeO (CaO/SiO 2 = 1.3) system primary blast furnace slag. The slag viscosity is measured by the rotating cylinder method, which is essential to the efficient and stable operation of a blast furnace. The network structure characterization of the quenched vitreous samples was conducted using Fourier Transformation Infrared (FTIR) and Raman spectroscopy. Usual viscous behaviors (that the slag viscosity and the activation energy decrease or increase with increasing MgO or Al 2 O 3 content) were observed, corresponding to changes in the network structure certified by FTIR and Raman analyses. It seems that the addition of MgO and Al 2 O 3 prefers to modify the Si−O and Ti−O network in the present slag. When the slag composition reaches 10% MgO and 12% Al 2 O 3 , unexpected viscous behaviors (that MgO increases viscosity and Al 2 O 3 decreases viscosity) are discovered. The roles of MgO and Al 2 O 3 could be interpreted by changes in the arrangement structure of ions in liquid, corresponding to changes in the primary equilibrium phase region determined in phase diagrams and variation in the difference between the experimental and liquidus temperature, respectively.

show abstract

Effects of CaO/SiO<sub>2</sub> on Viscous Behaviors and Structure of CaO-SiO<sub>2</sub>-11.00wt%MgO-11.00wt%Al<sub>2</sub>O<sub>3</sub>-43.00wt%TiO<sub>2</sub> Slag Systems

Cited by 33 publications

References 32 publications

Structure and Viscosity of CaO–Al<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> Based Mould Fluxes with Varying CaO/Al<sub>2</sub>O<sub>3</sub> Mass Ratios

Structure and Viscosity of CaO–Al<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> Based Mould Fluxes with Varying CaO/Al<sub>2</sub>O<sub>3</sub> Mass Ratios

Applicability of Time-Gated Raman Spectroscopy in the Characterisation of Calcium-Aluminate Inclusions

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

Contact Info

Product

Resources

About