Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag

Ren, Zhong-shan; Hu, Xiaojun; Hou, Xinmei; Xue, Xiangxin; Chou, Kuo‐Chih

doi:10.1007/s12613-014-0915-8

Cited by 13 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the thermodynamic analysis shown in Figure a, CaTiO 3 might be an intermediate product during dissolution. This phase was detected in the study of Ren et al during the dissolution of TiO 2 substrate in a slag of same composition in the temperature range of 1370–1430 °C. The presence of CaTiO 3 at the particle/slag interface might indicate toward a chemical reaction control.…”

Section: Resultsmentioning

confidence: 73%

“…Based on an assumption of a straight dissolution path (dotted lines), CaTiO 3 is likely to form on the surface of TiO 2 particle while CaO.6Al 2 O 3 and Al 2 O 3 might form on the surface of Al 2 TiO 5 particle. In a previous study on dissolution mechanism of TiO 2 in same slag by Ren et al, CaTiO 3 phase was detected at the interface between CaO–SiO 2 –Al 2 O 3 type slag and TiO 2 rod in the temperature range between 1370 and 1430 °C. The liquid phase field on the phase diagram for TiO 2 is much larger than the corresponding phase profile for the Al 2 TiO 5 slag system which implicates a higher thermodynamic driving force for TiO 2 dissolution than Al 2 TiO 5 dissolution.…”

Section: Methodsmentioning

confidence: 87%

“…However, this value is higher than the diffusivity of Ti 4+ reported in literature which is in the order of 10 −12 m 2 s −1 . Ren et al estimated the diffusivity of TiO 2 as 4.5 × 10 −12 m 2 s −1 in a slag of same composition as that used in the current work at 1430 °C. In their study, they used a TiO 2 disc of 10 mm O.D.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Sharma

Dąbkowska

Dogan

2018

steel research int.

View full text Add to dashboard Cite

The dissolution kinetics of micro‐particles (inclusions) in steelmaking slags is investigated using the high temperature confocal scanning laser microscope (HT ‐ CSLM). However, these studies focus on the limited type of inclusions such as Al2O3, SiO2, MgO, CaO, and MgAl2O4. To experimentally study the removability of various problematic inclusions that are not available in the market, optical floating zone and sintering techniques are presented here for the production of high purity micro‐particles. The syntheses of TiO2 and Al2TiO5 inclusions are employed to demonstrate the advantages and potential of both techniques. These inclusions are then dissolved in the steelmaking slags using CSLM at 1430 °C. In situ observation shows that there is gas evolution during the reaction between slag and Al2TiO5 particles prepared by both techniques. However, the gas evolution is more rapid during the dissolution of particles prepared by sintering and hinders in situ observations and measurements. The optical floating zone technique is capable of preparation of micro‐particles with high purity and less porosity. At 1430 °C, the Al2TiO5 particles do not dissolve at all, whereas TiO2 particles completely dissolve in 200 s.

show abstract

Section: Resultsmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 87%

See 1 more Smart Citation

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Sharma

Dąbkowska

Dogan

2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…Based on Stokes's law, the settling velocities of particles in different sizes were calculated [18]. From the calculated results, it was concluded that inclusions with the size larger than 20 μm settled and reached the bottom of the furnace after holding for 30 min.…”

Section: Effect Of Holding Time On the Inclusionsmentioning

confidence: 99%

Development of inclusions in 3104 alloy melt during heating and holding treatments

Luo

Zhang

Han

et al. 2016

Int J Miner Metall Mater

View full text Add to dashboard Cite

Developments in the contents of different typical inclusions in 3104 alloy melt were described during heating and holding processing. The settling process of inclusion particles was investigated by measuring the contents of inclusions in the surface, center, and bottom layers of the molten metal. In the results, main inclusions observed and determined by Prefil and PoDFA methods are MgO, Al 2 O 3 , spinel (MgAl 2 O 4 ), and TiB 2 particles or thin films. It is found that some small particles of Al 2 O 3 and MgO are transformed into spinel particles, and the formation rate increases as the temperature and the holding period of melt increase. The content of inclusions increases from 3.37 mm 2 kg 1 to 7.54 mm 2 kg 1 and then decreases to 3.08 mm 2 kg −1 after holding for 90 min. This is attributed to a settling phenomenon and a significant increase in settling velocity after holding for 60 min. The content of inclusion particles decreases by means of settlement and flotation in liquid aluminum with an increase in holding time. The theoretical analysis and experiment results are in essential agreement with those from industrial production.

show abstract

“…Due to the importance of absorbing inclusions, this topic has been studied by scholars, and the main research methods used are the rotating cylinder method [5][6][7] and the confocal scanning laser microscope (CSLM) method [8][9][10]. Zhong-shan Ren et al [11] studied the dissolution and diffusion behavior of TiO 2 particles in molten slag with the CSLM method. Higher temperatures favored the dissolution and diffusion of TiO 2 , whereas a greater Al 2 O 3 content in the slag restrained the dissolution and diffusion.…”

Section: Introductionmentioning

confidence: 99%

Effects of BaO and B2O3 on the Absorption of Ti Inclusions for High Titanium Steel

Li¹,

Geng²,

Hou³

et al. 2021

Metals

View full text Add to dashboard Cite

In order to study the effect of BaO or B2O3 on the absorption of Ti inclusions, the effects of mold fluxes with different contents of BaO (0~15%) or B2O3 (0~15%) on the mass transfer coefficients of TiO2 or TiN were studied with the rotating cylinder method. The experimental results show that with the addition of BaO in the mold flux, the mass transfer coefficient of TiO2 increases from 4.58 × 10−4 m/s to 6.08 × 10−4 m/s, that of TiN increases from 3.09 × 10−4 m/s to 4.41 × 10−4 m/s, 2CaO·MgO·2SiO2 is transformed into BaO·2CaO·MgO·2SiO2, and the Ti inclusions combine with CaO to form CaTiO3. With the addition of B2O3 in the mold flux, the mass transfer coefficient of TiO2 increases from 4.58 × 10−4 m/s to 7.46 × 10−4 m/s, that of TiN increases from 3.09 × 10−4 m/s to 5.50 × 10−4 m/s, CaO and B2O3 combine to 2CaO·B2O3, and Ti inclusions exist in the form of TiO2. During the experiment, TiN will be transformed into titanium oxide.

show abstract

Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag

Cited by 13 publications

References 13 publications

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Development of inclusions in 3104 alloy melt during heating and holding treatments

Effects of BaO and B2O3 on the Absorption of Ti Inclusions for High Titanium Steel

Contact Info

Product

Resources

About