Recovery of Titanium from Blast Furnace Slag

Valighazvini, Farzaneh; Rashchi, Fereshteh; Nekouei, Rasoul Khayyam

doi:10.1021/ie301837m

Cited by 42 publications

(18 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…% TiO 2 (XRF analysis). This confirms that nearly all TiO 2 was dissolved by sulfuric acid [29]. The black TiOSO 4 solution formed by this acidolysis was further hydrolyzed to make precipitates through adjusting the hydrolytic pH to a value of 1, 2 or 3 using 25% aqueous ammonia.…”

Section: Slag Treatment and Catalyst Preparationmentioning

confidence: 53%

“…Four parallel of syntheses were formed and named as BFS-TiO 2 N with N (pH = 1, 2, 3), denoting the pH value, and further NA for the case without pH adjustment. During leaching, TiO 2 , SiO 2 , Al 2 O 3 , and MgO become soluble, whereas CaO remains as CaSO 4 residue [29]. The composition of precipitated products, as shown in Table 1, obviously varied with hydrolytic pH value, indicating the dependence on isoelectric points (IEPs) of different components in the solution.…”

Section: Composition Varying With Hydrolytic Ph Valuementioning

confidence: 99%

See 1 more Smart Citation

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

Tran

Gan

et al. 2016

Catalysts

View full text Add to dashboard Cite

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.

show abstract

Section: Slag Treatment and Catalyst Preparationmentioning

confidence: 53%

Section: Composition Varying With Hydrolytic Ph Valuementioning

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

View full text Add to dashboard Cite

show abstract

“…Much more titanium was recovered from water-quenched and naturally cooled slag. Valighazvini et al leached titanium from BF slags with H 2 SO 4 [14]. They noted that the TiO 2 , Al 2 O 3 , and MgO became soluble, whereas the CaO remained in the residue as CaSO 4 .…”

Section: Blast Furnace Slag (Bf Slag)mentioning

confidence: 99%

Hydrometallurgical Processes for the Recovery of Metals from Steel Industry By-Products: A Critical Review

Binnemans

Jones

Fernández

et al. 2020

J. Sustain. Metall.

View full text Add to dashboard Cite

The state of the art for the recovery of metals from steel industry by-products using hydrometallurgical processes is reviewed. The steel by-products are different slags, dusts, and sludges from a blast furnace (BF), basic oxygen furnace (BOF), electric arc furnace (EAF), and sinter plant, as well as oily mill scale and pickling sludge. The review highlights that dusts and sludges are harder to valorize than slags, while the internal recycling of dusts and sludges in steelmaking is inhibited by their high zinc content. Although the objectives of treating BF sludges, BOF sludges, and EAF dust are similar, i.e., the removal of zinc and the generation of an Fe-rich residue to be returned to the steel plant, these three classes of by-products have specific mineralogical compositions and zinc contents. Because wide variations in the mineralogical composition and zinc content occur, it is impossible to develop a one-size-fits-all flow sheet with a fixed set of process conditions. The reason for the interest in EAF dust is its high zinc content, by far the highest of all steel by-products. However, EAF dust is usually studied from the perspective of the zinc industry. There are not only different concentrations of zinc, but also variations in the all-important ZnO/ZnFe2O4 (zincite-to-franklinite) ratio. In many chemical processes, only the ZnO dissolves, while the ZnFe2O4 is too refractory and reports to the residue. It only dissolves in concentrated acids, or if the dust is pre-treated, e.g., with a reductive roasting step. The dissolution of ZnFe2O4 in acidic solutions also brings significant amounts of iron in solution. Finally, due to its high potassium chloride content, sinter-plant dust could be a source of potassium for the fertilizer industry. Graphical Abstract

show abstract

“…The TBBFS generally contains 10–25 wt% of TiO 2 , mainly in the form of CaTiO 3 , in addition to the conventional calcium, magnesium, and aluminium silicates. Although various processes have been proposed for utilizing the slag over the past 30 years, none of them has been industrialized until now except the combined process of high‐temperature carbonization and low‐temperature chlorination process . In this process, the molten TBBFS is reduced with coke at 1600–1800°C in a closed electric furnace to obtain carbonized TBBFS, in which CaTiO 3 is converted into TiC or Ti(C,N).…”

Section: Introductionmentioning

confidence: 99%

Indirect mineral carbonation of chlorinated tailing derived from Ti‐bearing blast‐furnace slag coupled with simultaneous dechlorination and recovery of multiple value‐added products

et al. 2018

View full text Add to dashboard Cite

The chlorinated tailing (CT) generated during titanium extraction from Ti‐bearing blast‐furnace slag contains 3–5 wt% chlorides, which are hazardous to the environment. In this paper, a process for simultaneous CO2 mineralization, dechlorination, and recovery of multiple value‐added products was proposed to fully utilize the CT. In this process, Ti, Al, Mg, and Ca are extracted in the form of their sulfates via roasting with recyclable (NH4)2SO4 followed by leaching with dilute H2SO4. Their extraction ratios are 83.1%, 87.4%, 89.4%, and 92.1%, respectively. The chlorides are simultaneously removed from the CT as gaseous HCl with a dechlorination ratio of 98.5%. Subsequently, 89.5% of the Al and 97.5% of the Ti in the leaching liquor are successively recovered as NH4Al(SO4)2·12H2O with a purity of 99 wt% and titanium‐rich material with TiO2 of 62.5 wt%. The CaSO4‐rich leaching residue and MgSO4‐rich leachate, after complete depletion of the Al and Ti, are separately carbonated with a mixed gas of CO2 and NH3 with total CO2 capacity up to 279.8 kg CO2 per tonne CT. The preliminary economic evaluation shows that income from selling products after the deduction of the cost of primary raw materials reaches 200 $/tonne CT. The proposed route therefore provides a cost‐efficient alternative for comprehensive utilization of the polluting CT. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

Recovery of Titanium from Blast Furnace Slag

Cited by 42 publications

References 12 publications

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

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

Hydrometallurgical Processes for the Recovery of Metals from Steel Industry By-Products: A Critical Review

Indirect mineral carbonation of chlorinated tailing derived from Ti‐bearing blast‐furnace slag coupled with simultaneous dechlorination and recovery of multiple value‐added products

Contact Info

Product

Resources

About