Recovery of titanium compounds from molten Ti-bearing blast furnace slag under the dynamic oxidation condition

Zhang, L.; Wang, M.Y.; Li, G.Q.; Zhitong, Sui

doi:10.1016/j.mineng.2007.01.003

Cited by 159 publications

(58 citation statements)

References 6 publications

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“…The VTM is a very complex ore containing about 30.5% Fe, 10.6% TiO2 and 0.3% V2O5. 1) At present, in order to extract Fe, the blast furnace (BF) process is traditionally adopted to reduce the VTM, and in the process Ti is concentrated and finally enters into the slag. The slag containing about 22-25% TiO2 has higher melting temperature and higher viscosity compared with those of the conventional BF slag without Ti-bearing.…”

Section: Introductionmentioning

confidence: 99%

Structure Analysis of CaO–SiO2–Al2O3–TiO2 Slag by Molecular Dynamics Simulation and FT-IR Spectroscopy

Zhang

Peng

et al. 2014

ISIJ Int.

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Section: Introductionmentioning

confidence: 99%

Structure Analysis of CaO–SiO2–Al2O3–TiO2 Slag by Molecular Dynamics Simulation and FT-IR Spectroscopy

Zhang

Peng

et al. 2014

ISIJ Int.

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“…The VTM is a very complex ore containing Ti, V, Co, Ni, Sc et al besides Fe, 1) and the phase of Ti exists in ilmenite (FeTiO3), titanomagnetite (Fe3O4·Fe2TiO4), ulvite (Fe2TiO4) and pseudobrookite (Fe2TiO5). After decades of basic research and industrial production practice, a complete set of blast furnace-converter smelting process has been successful developed to produce steel and vanadium/titanium products.…”

Section: Introductionmentioning

confidence: 99%

“…Although it has high production efficiency and large scale, the blast furnace-converter smelting process has many severe defects, especially in blast furnace process to reduce the VTM ore. In the blast furnace process, most of the iron and part of vanadium can be reduced into the hot metal, however, almost all of the titanium enters into the slag in phase formation of perovskite and titanaugite, Ti-rich diopside, forming the high titanium slag with the content of TiO2 varying from 22 to 25%, 1,2) which results in the foaming behavior, the increase of melting temperature and viscosity of slag, 3) as well as the difficult separation of slag-iron. 4,5) In particular, viscosity which is sensitive to the structure change of the slag plays a prominent role in the blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Zhang

Bai

et al. 2013

ISIJ Int.

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The change of structure in the ternary system CaO-SiO2-TiO2 with TiO2 varying from 0 to 25% mole fraction at a fixed basicity of 0.8 was investigated by means of molecular dynamics simulation. The present simulation demonstrates that most Si is coordinated with 4 O within a tetrahedron while the majority of Ti with 6 O in an octahedron. With the addition of TiO2, the coordination number for Si (CNSi-O) changes from 4.12 to 4.03, while the CNTi-O varies from 5.83 to 5.52. The fraction of bridging oxygen (Si-O-Si) decreases resulting in the depolymerization of silicate structure and the Si-O-Ca is gradually replaced by Si-O-Ti with increasing TiO2 fraction. Two [TiO6] octahedrons are connected by two ways with the angles of Ti-O-Ti equaling to 100° and 140°, and the fraction of them are almost the same for sample with 10 mol-% TiO2 addition. The variation of network connectivity Q n of Si also agrees with the above conclusion. Thus, TiO2 is regarded as basic oxide which acts as modifier in this ternary system in terms of its structure within this system.

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“…In China, only 25% of Ti-bearing BFS is used to make dam concrete or road-paving material. The accumulated Ti-slag has exceeded 70 million tons, and it still increases by a rate of three million tons per year in China [20,23]. This not only wastes its containing Ti resource but also causes serious environmental pollution [23].…”

Section: Introductionmentioning

confidence: 99%

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

Tran

Gan

et al. 2016

Catalysts

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Abstract:The study is devoted to developing a rather high-efficiency NH 3 -SCR (selective catalytic reduction) catalyst for NO x removal using TiO 2 -SiO 2 support made from blast furnace slag. Through adjusting hydrolytic pH value of TiOSO 4 solution obtained from acidolysis of slag with 70 wt. % H 2 SO 4 , a series of TiO 2 -SiO 2 mixed oxides was prepared to have different mass ratios of TiO 2 to SiO 2 . The supports are further impregnated with V 2 O 5 and WO 3 to make the SCR catalysts for NO x removal. Characterizing the catalysts show that silica and unavoidable impurities in support prepared from slag were responsible for maintaining their mesoporous structure and the enhancements in the acidity and reducible form of active species on the catalyst surface, which thus rendered the catalysts to have higher NO x reduction capability than catalyst using commercial TiO 2 . Furthermore, the low-cost catalyst prepared from slag-based TiO 2 support possesses good stability, and strong resistance to SO 2 and H 2 O poisoning, which are beneficial to practical deNO x applications.

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Recovery of titanium compounds from molten Ti-bearing blast furnace slag under the dynamic oxidation condition

Cited by 159 publications

References 6 publications

Structure Analysis of CaO–SiO2–Al2O3–TiO2 Slag by Molecular Dynamics Simulation and FT-IR Spectroscopy

Structure Analysis of CaO–SiO2–Al2O3–TiO2 Slag by Molecular Dynamics Simulation and FT-IR Spectroscopy

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

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