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Hydrogen assisted magnesiothermic reduction of TiO2
Zhang, Ying1,2; Fang, Zhigang Zak1; Xia, Yang1; Sun, Pei1; Van Devener, Brian1; Free, Michael1; Lefler, Hyrum1; Zheng, Shili2

The development of low cost titanium metal production processes has challenged the Ti research and industrial communities around the world for decades. The strong affinity of titanium to oxygen dictates that it is very difficult to produce low-oxygen Ti metal from TiO2 directly. In this paper, a hydrogen assisted magnesiothermic reduction (HAMR) process for producing Ti metal powder from TiO2 powder at relatively low temperatures (<= 750 degrees C) is established. The overall approach is based on the thermodynamic tuning of the relative stability of MgO versus that of Ti-O solid solutions by temporarily alloying the system with hydrogen. It is shown that Ti-H-O solid solutions are less stable than their corresponding Ti-O solid solutions, which changes the reaction of Mg with Ti-O from being thermodynamically unfavorable to being favorable. The key steps for producing pure Ti metal powder from TiO2 involve Mg reduction of TiO2 in a hydrogen atmosphere which produces porous TiH2, a heat treatment procedure to consolidate the powder and reduce specific surface area of the powder, and the final step to deoxygenate the powder using Mg in a hydrogen atmosphere to further reduce the oxygen content. This paper systematically examines the changes of oxygen content, phase transformations, and the evolution of the morphology of the particles during the entire process. The results show that this approach has great potential to be a viable method for the production of low-oxygen Ti metal powder from TiO2. In addition, the effect of hydrogen on the oxidation of Ti powder is analyzed using XPS, which reaffirms that titanium hydride is more impervious to surface oxidation than Ti metal, another crucial advantage of using hydrogen atmosphere. (C) 2016 Elsevier B.V. All rights reserved.

KeywordTi Metal Powder Tio2 Reduction Deoxygenation Magnesium Hydrogen
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS Keywordo Solid-solution ; Titanium-dioxide ; Calciothermic Reduction ; Calcium Reductant ; Alloy Powder ; Deoxidation ; Oxides ; Solubility ; Chloride
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationU.S. Department of Energy (DOE), Advanced Research Projects Agency-Energy (ARPA-E)(DE-AR0000420)
WOS IDWOS:000389088000032
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA
2.Chinese Acad Sci, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Ying,Fang, Zhigang Zak,Xia, Yang,et al. Hydrogen assisted magnesiothermic reduction of TiO2[J]. CHEMICAL ENGINEERING JOURNAL,2017,308:299-310.
APA Zhang, Ying.,Fang, Zhigang Zak.,Xia, Yang.,Sun, Pei.,Van Devener, Brian.,...&Zheng, Shili.(2017).Hydrogen assisted magnesiothermic reduction of TiO2.CHEMICAL ENGINEERING JOURNAL,308,299-310.
MLA Zhang, Ying,et al."Hydrogen assisted magnesiothermic reduction of TiO2".CHEMICAL ENGINEERING JOURNAL 308(2017):299-310.
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