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- Title
Concentrating CaO from Lunar Simulant by Calciothermic Reduction Process.
- Authors
Zhang, Jie; Li, Detian; Zhang, Yuankun; He, Chengdan; Feng, Sen; Wang, Jin; Li, Chengfang; Wang, Yongjun; Liu, Aimin; Shi, Zhongning
- Abstract
The lunar regolith can be utilized as raw materials for constructing lunar bases through the fabrication of lunar cement. However, the low CaO content in lunar regolith presents a challenge for producing silicate cement. This study explores enriching CaO in NEU-1 lunar soil simulant by calciothermic reduction. Non-isothermal differential scanning calorimetry analysis indicated that calcium reacted with Fe2O3, SiO2, and Al2O3 at approximately 808°C, 816°C, and 826°C, respectively. The reaction ratios were 1.1, 1.6, and 0.8, with apparent activation energies of 941.6 kJ/mol, 965.17 kJ/mol, and 547.28 kJ/mol. The products obtained from the calciothermic reduction of lunar soil simulant were CaO, Ca2Si, and AlFe, as analyzed by X-ray diffraction. Increasing the temperature was found to be beneficial to the reaction process, and a suitable reaction temperature of 850°C was determined. X-ray photoelectron spectroscopy analysis showed that the reduction percentages of SiO2 and Al2O3 were 93.01% and 91.04%, respectively, at 850°C for 30 min. The CaO content in the product obtained by calciothermic reduction was 50.65%, which could be further increased to 81.16% after crude purification, and the CaO yield was 82.57%. These results demonstrated that the process has a significant CaO enrichment effect.
- Subjects
LUNAR soil; X-ray photoelectron spectroscopy; DIFFERENTIAL scanning calorimetry; REGOLITH; RAW materials; ACTIVATION energy
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 5, p2403
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-024-06488-4