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Faster Generation of Nanoporous Hematite Ore through Dehydration of Goethite under Vacuum Conditions

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Title: Faster Generation of Nanoporous Hematite Ore through Dehydration of Goethite under Vacuum Conditions
Authors: Kurniawan, Ade Browse this author
Saito, Genki Browse this author
Nomura, Takahiro Browse this author →KAKEN DB
Akiyama, Tomohiro Browse this author
Keywords: vacuum-dehydration
pore morphology
low-grade iron ore
porous ore
Issue Date: 17-May-2021
Publisher: 一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan)
Journal Title: ISIJ international
Volume: 61
Issue: 1
Start Page: 493
End Page: 497
Publisher DOI: 10.2355/isijinternational.ISIJINT-2020-403
Abstract: Goethite (FeOOH)-based ore has become attractive to be utilized in ironmaking. As mildly dehydrated to remove its high combined water (CW), it changes to a nanoporous hematite ore. The nanopore contributes a significant increase in ore reduction reactivity due to the nanocontact between iron oxide and reducing agents such as C, CO, or H-2. However, the long dehydration time of goethite ore is still one problem. This study revealed the effect of vacuum condition on the mild-dehydration of goethite-based ore significantly reduces the ore dehydration time. The dehydration is finished within one hour at 300 degrees C under high-vacuum condition (P=1.7 Pa), producing nanoporous hematite ore that is similar to under atmospheric one for 24 h. However, no significant decrease in the dehydration temperature under the high-vacuum condition. In contrast, in-situ heating TEM observation reveals that nanopore generation can occur at low temperatures under ultra-high vacuum conditions (P = 5.6 x 10(-6) Pa). Slit pore generates at low temperatures that then eventually disappear by merging to bigger pores at the higher temperatures.
Type: article
Appears in Collections:エネルギー・マテリアル融合領域研究センター (Center for Advanced Research of Energy and Material) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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