Titanium distribution between blast furnace slag and iron for blast furnace linings protection

Sun, Jian; Wang, Shuai; Chu, Mansheng; Chen, Mao; Zhao, Zhixing; Zhao, Baojun; Liu, Zhenggen

doi:10.1080/03019233.2018.1557847

Cited by 9 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 Also, with increasing amounts of TiO 2 , the corrosion resistance and the porosity of the GGBS increase. 9,13,16 All these slag properties generally change at a limit of about 1% TiO 2 , 9,17,18 even if the exact value of this limit differs depending on the blast furnace slag considered.…”

Section: Technological Contextmentioning

confidence: 99%

“…Indeed, the presence of titanium during steelmaking helps protect the refractory materials of the blast furnace and extends its lifetime. Titanium can be present in slags as Ti 4+ and Ti 3+ , as the molten slag is formed in a blast‐furnace under reducing conditions that favor the presence of some Ti as Ti 3+ , 13 as shown in titania slags 14 . Even at low TiO 2 contents, the presence of Ti leads to changes in the structure of the amorphous slags 9,15 .…”

Section: Technological Contextmentioning

confidence: 99%

See 1 more Smart Citation

Structural role of titanium on slag properties

Cornec

Galoisy

Izoret³

et al. 2020

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

The presence of titanium in ground granulated blast-furnace slags (GGBS) has been suspected to modify cement properties. This study provides the first evidence of a relation between the TiO 2 content of slags and the mechanical properties of mortars based on slag cements. It is observed that only the slags containing less than 1%TiO 2 show a compressive strength at 28 days that remains within the 52.5 MPa norm with CEM III cements complying with the European Standard NF EN 197-1. The structural origin of this chemical dependence of the performance of cements is investigated by determining directly the titanium speciation in various European slags by spectroscopic methods. Electron paramagnetic resonance indicates that about 76% of Ti in slag occurs as Ti 4+. The atomic structure around Ti was determined by Ti K-edge X-ray absorption near edge structure, which shows that Ti is mainly five-fold coordinated in square-based pyramid geometry. Five coordinated Ti acts as networkstabilizer of the silicate network as it increases the polymerization. Requiring Ca 2+ for charge-compensation of the titanyl bond, it reduces the availability of Ca 2+ during glass alteration in a modified random model of glass structure, where Ca 2+ atoms are clustered in percolating cationic domains. As a consequence, the presence of fivecoordinated Ti results in a slower dissolution of the slag. These peculiar structural properties of titanium may explain the detrimental role of Ti above a 1% concentration, for many physical and chemical slag properties. This work provides a scientific ground for the technological acceptability of the upper limit of the Ti-content of GGBS.

show abstract

Section: Technological Contextmentioning

confidence: 99%

Section: Technological Contextmentioning

confidence: 99%

Structural role of titanium on slag properties

Cornec

Galoisy

Izoret³

et al. 2020

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

show abstract

“…The presence of titanium in the iron sand has positive and negative effects for the extraction of iron. Iron sand in a controlled amount can be utilized to extend the service life of the refractory in the blast furnaces by charging its pellet together with sinter ore [1,2]. If a large quantity of iron sand is added, the slag viscosity increases and titanium oxide is reduced to titanium metal, leading to the formation of Ti(C,N) in hot metal, which in turn results in operation difficulties of the blast furnace [3].…”

Section: Introductionmentioning

confidence: 99%

Iron nugget formation from iron sand/coal composite pellets under isothermal-temperature gradient profiles

Zulhan

2020

Ironmaking & Steelmaking

View full text Add to dashboard Cite

An iron sand concentrate was mixed with coal as the reductant and binder to produce a composite pellet by a mini rotating disc. The pellet was inserted into an alumina crucible and coal was added to maintain the reducing environment by covering the whole surface of the pellet. The reduction was carried out under the isothermal and temperature gradient profile in a muffle furnace where the starting temperature was isothermal at 1000°C, increased with a heating rate of 6.33°C min −1 to a final temperature of 1380°C. The results show that the total iron content increased from 46.9% in the initial pellet to 72.5% in the reduced pellet. The iron nugget formed on the surface of the reduced pellet at 1380°C. The nugget primarily consisted of iron, and the slag mostly consisted of anatase or brookite. The titanium content increased from 4.8% in the initial pellet to 24.4% in the slag.

show abstract

“…The blast furnace (BF) smelting of Ti-bearing iron ore occupies an appreciable proportion in hot metal production because of abundant titanomagnetite resources in China [1,2]. In addition, ironmakers use the burden containing TiO 2 to protect the hearth refractory due to the formation of titanium carbide and nitride for prolonging the furnace campaign life [3][4][5]. The softening-melting of Ti-bearing materials in BF generates the flowable primary slag whose formation could be also regarded as a process of interaction and reorganization of various phase components [6].…”

Section: Introductionmentioning

confidence: 99%

Influences of Al2O3 and TiO2Content on Viscosity and Structure of CaO–8%MgO–Al2O3–SiO2–TiO2–5%FeO Blast Furnace Primary Slag

Sun

Song

et al. 2019

Metals

View full text Add to dashboard Cite

In view of the fact that Ti–bearing blast furnace primary slag has been explored limitedly and its viscosity–structural property is not fully understood, the phase compositions, viscosity and structure of CaO–8%MgO–Al2O3–SiO2–TiO2–5%FeO slag are investigated by X-ray diffractometer, rotating cylinder method, Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy respectively, considering the effect of Al2O3 and TiO2. The critical temperature that is defined as the temperature below which the viscosity of slag increases quickly, could be explained by the relative amount of perovskite to melilite from phase compositions analysis. The slag viscosity first increases with increasing Al2O3 content from 10 to 15 mass%, and then decreases with the further increase of Al2O3 to 18 mass%. Increasing TiO2 content continuously lowers the viscosity. FTIR and Raman spectra results show that increasing Al2O3 or decreasing TiO2 content leads to complex Si–O and Ti–O networks structure, corresponding to the slag viscosity variation. The effect of weak linkages of Si–O–Al is more dominant when Al2O3exceeds 15 mass%, which results in the decrease of viscosity.

show abstract

Titanium distribution between blast furnace slag and iron for blast furnace linings protection

Cited by 9 publications

References 18 publications

Structural role of titanium on slag properties

Structural role of titanium on slag properties

Iron nugget formation from iron sand/coal composite pellets under isothermal-temperature gradient profiles

Influences of Al2O3 and TiO2Content on Viscosity and Structure of CaO–8%MgO–Al2O3–SiO2–TiO2–5%FeO Blast Furnace Primary Slag

Contact Info

Product

Resources

About