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Other TitlePreliminary Study on Reduction of Metallic Oxide by Laser Plasma for Lunar Resources Use
Author(jpn)松井, 信; 福路, 直大; 中野, 正勝; 山極, 芳樹; 小紫, 公也; 荒川, 義博
Author(eng)Matsui, Makoto; Fukuji, Naohiro; Nakano, Masakatsu; Yamagiwa, Yoshiki; Komurasaki, Kimiya; Arakawa, Yoshihiro
Author Affiliation(jpn)静岡大学工学部; 静岡大学大学院; 東京都立産業技術高等専門学校; 静岡大学工学部; 東京大学大学院新領域創成科学研究科; 東京大学工学部
Author Affiliation(eng)Faculty of Engineering, Shizuoka University; Graduate School, Shizuoka University; Tokyo Metropolitan College of Industrial Technology; Faculty of Engineering, Shizuoka University; Graduate School of Frontier Sciences, The University of Tokyo; Faculty of Engineering, The University of Tokyo
Issue Date2013-03
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Publication title第32回宇宙エネルギーシンポジウム
32nd ISAS Space Energy Symposium
Publication date2013-03
AbstractFor construction of a lunar base, huge amounts of building supplies are necessary. However, since it costs too much to bring all building supplies from the earth, it is desirable to use lunar resources for the construction. The surface of the lunar is covered with regolith. The regolith is sand of many kinds of metallic oxide such as SiO2, Al2O3, CaO, MgO, FeO etc. Then, we can get metallic building supplies by reducing the regolith. The conventional electrolysis method (i.e., the Hall-Heroult process) is widely used in industry, but it is not suitable for application on the moon, as it requires carbon electrodes as the reducing agent, which does not exist on the lunar surface. In this study, we employed a laser plasma wind tunnel to reduce Al2O3. The use of stationary plasma for alumina reduction enables a higher processing capacity than direct heating by a focused laser beam. As a reducing agent, hydrogen is mixed with the working gas of argon because the hydrogen derived from solar wind exists on the lunar surface. The system consists of three parts, which are involved in thermal dissociation, frozen flow and Al collection. First, the Al2O3 powder was fed into the laser-sustained plasma at atmospheric pressure. The produced Al was accelerated to supersonic speeds by a convergent-divergent nozzle to prevent Al from recombining with oxygen. From the Al and argon line distributions in the flow direction, it was found that Al remained in the dissociated state. A water-cooled copper tube was inserted in the flow to collect Al. X-ray analysis indicated that elemental Al was observed on the surface of the tube. The maximum value of the estimated reduction efficiency was 5.5 %.
Description会議情報: 第32回エネルギーシンポジウム (2013年3月1日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県
形態: カラー図版あり
形態: PDF
Meeting Information: The Space Energy Symposium (March 1, 2013. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
Physical characteristics: Original contains color illustrations
Physical characteristics: PDF
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会
Report NoSES-2012-019

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