Influence of B2O3 on Viscosity of High Ti-bearing Blast Furnace Slag

Ren, Shan; Zhang, Jianliang; Wu, Liushun; Liu, Weijian; Bai, Yanru; Xing, Xiangdong; Su, Buxin; Kong, Dewen

doi:10.2355/isijinternational.52.984

Cited by 62 publications

(47 citation statements)

References 21 publications

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“…Studies on viscous flow behaviors of the borosilicate melts [17][18][19][20] generally show a decreasing viscosity with increasing B 2 O 3 content in the melts. In addi-tion, in a previous study on crystallization behaviors, 21) we found that a B 2 O 3 addition of 5% brought about a drastic change of primary crystalline phase in a CaO-SiO 2 -MgOAl 2 O 3 -TiO 2 -B 2 O 3 melt, viz., from CaTiO 3 to TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Short-range and Medium-range Structural Order in CaO–SiO2–TiO2–B2O3 Glasses

Sun

et al. 2016

ISIJ International

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The present study aimed to provide a deep insight of short-range and medium-range structural order for CaO-SiO 2 -TiO 2 -B 2 O 3 glasses. From various prospects, four techniques, FTIR, Raman, XPS and NMR, were simultaneously employed and only the direct evidences indicated from the spectra were used for structural analysis. The FTIR and Raman spectra proved that the main silicon-related units were Q 0 (Si), Q 1 (Si), Q 2 (Si) and Q 3 (Si) and the results of Raman fittings revealed that a B 2 O 3 addition resulted in an increase of Q 1 (Si) and Q 3 (Si) at the cost of Q 0 (Si) and Q 2 (Si), thus inducing an increasing Degree of Polymerization (DOP). An enhanced DOP generally implied a lower abundance of non-bridging oxygen in the networks, which was further demonstrated by the O1s XPS fittings. Additionally, the 11 B NMR spectra indicated that the dominant boron-related groups were BO 3 trigonal comprising ring and non-ring BO 3 as well as BO 4 tetrahedral comprising BO 4 (1B,3Si) and BO 4 (0B,4Si). Furthermore, it was clarified that an increase of B 2 O 3 content promoted the ratios of BO 4 (1B,3Si) to BO 4 (0B,4Si) and BO 4 tetrahedral to BO 3 trigonal, which undoubtedly identified the occurrence of an equilibrium reaction between NBO, BO 4 tetrahedral and BO 3 trigonal in the glass.

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Section: Introductionmentioning

confidence: 99%

Short-range and Medium-range Structural Order in CaO–SiO2–TiO2–B2O3 Glasses

Sun

et al. 2016

ISIJ International

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“…However, they also recently found that a decrease in viscosity occurs at higher B 2 O 3 concentrations in CaO-SiO 2 -B 2 O 3 -TiO 2 -based systems, and presumed that this results from the weaker bond energy of B-O compared to Si-O or alkaline earth metal-oxygen bonds. 11) In the blast furnace slag system, according to Ren et al,20) even though the addition of boron oxide increases the amount of 4-coordinated boron oxide ([BO 4 ] 5-), the viscosity is nonetheless reduced by a lowering of the eutectic temperature. Similarly the complicated effects of B 2 O 3 on its physical properties were also pointed out by Fox et al 18) They reported that because of the formation of three-fold and/or four-fold co-ordination of borosilicates, the effect of B 2 O 3 was to create both a decrease and increase in viscosity for various mold flux systems.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Kim

Morita

2014

ISIJ Int.

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Using a transient hot-wire method, the thermal conductivity of the CaO-SiO2-B2O3 mold flux system was measured. The effects of temperature, BO1.5 concentration and basicity on the thermal conductivity were considered, along with structural investigation by Raman spectroscopy. It was found that the addition of boron oxide caused both a decrement and increment of thermal conductivity, depending on the basicity. These conflicting effects on thermal conductivity were considered to be caused by the following two different behaviors in the oxide melts. Boron oxide is incorporated into silicate networks at a lower basicity, while it tends to form borate networks at higher CaO/SiO2 ratios. In the case of basicity dependency, thermal conductivity initially decreases or remains constant with increasing CaO/SiO2 ratio in regions of low basicity, but increases when the CaO/SiO2 ratio is higher than 1.15. Due to the incorporated state of boron oxide in silicate networks at low basicity, the thermal conductivity is likely to be predominantly affected by the silicate networks. However, at a relatively high CaO/SiO2 ratio, an increase in chain-type metaborate was observed through Raman spectroscopy; this structural change in borate being responsible for the increment in thermal conductivity with higher basicity. Finally, the apparent activation energy of thermal conductivity was calculated, and was found to be reduced by the addition of boron oxide.

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“…9(d)-9(f), where initial crystallization temperature is getting higher with the increase of B2O3 changing from 834°C to 865°C and 901°C respectively, when B2O3 contents becomes from 6.03% to 8.00% and 10.03 mass%. Boron, as one of the network former, 27,28) could form the trigonal planar [BO3] 3-…”

Section: Experiments Proceduresmentioning

confidence: 99%

Effect of Na2O and B2O3 on Heat Transfer Behavior of Low Fluorine Mold Flux for Casting Medium Carbon Steels

et al. 2013

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An investigation was conducted to study the effects of Na2O and B2O3 on heat transfer behavior of low fluorine mold flux for casting medium carbon steels by using Single Hot Thermocouple Technique (SHTT) and an advanced Infrared Emitter Technique (IET) in this paper. Results suggested that crystalline layer thickness, crystalline fraction and interfacial thermal resistance of the mold flux increased with the addition of Na2O, while they decreased with the increase of B2O3. Besides, the initial crystallization temperature and steady state heat flux reduced with the addition of Na2O, and they were getting higher with the addition of B2O3. Those results obtained in this research can provide fundamental guidance for designing new type of low fluorine or fluorine free mold fluxes for casting medium carbon steels.

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Influence of B2O3 on Viscosity of High Ti-bearing Blast Furnace Slag

Cited by 62 publications

References 21 publications

Short-range and Medium-range Structural Order in CaO–SiO<sub>2</sub>–TiO<sub>2</sub>–B<sub>2</sub>O<sub>3</sub> Glasses

Short-range and Medium-range Structural Order in CaO–SiO<sub>2</sub>–TiO<sub>2</sub>–B<sub>2</sub>O<sub>3</sub> Glasses

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Effect of Na2O and B2O3 on Heat Transfer Behavior of Low Fluorine Mold Flux for Casting Medium Carbon Steels

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