A Method for the Extraction of Alumina and Silica from Lunar Regolith Using Hydrochloric Acid
Bibliographic record
Abstract
50 years after the last Apollo mission, humanity is finally returning to The Moon.Thanks to advances in rocketry, additive manufacturing techniques, and material sciences, we are in a position where we can not only go to the Moon, but also establish permanent colonies once there.The aim of this research has been to confirm a proposed method for extraction of silica and alumina from lunar regolith using hydrochloric acid leaching.This process has the potential of being the starting point for a sustainable industrial basis for lunar resource extraction.This research built a workbench prototype for later payload development which will be used to decompose lunar anorthite (CaAl2Si2O8) using acid weathering.The intent of this experiment was to extract alumina (Al2O3) and silica (SiO2) from anorthite.Given that anorthite is abundant in the lunar highlands and practically free of sodium, it is a particularly attractive source of base materials.The intent was to confirm a sustainable means of producing smelter grade alumina for the purpose of in-situ manufacturing as well as silica extraction as part of a near closed-cycle environment.The silica produced is intended for the manufacturing of fused silica glass, thermal insulation fibers, and optical fiber cables.The alumina on the other hand can be used for the production of neutral refractory ceramics which can withstand temperatures of approximately 2000⁰C.Both the silica and alumina can also act as sources of metals (pure Si and Al) through electrochemical reduction which also produces oxygen (O2) as a useful biproduct.Lunar soil samples not being readily available, commercially sourced lunar simulant was used in its stead for our demonstration.To generate alumina and silica, the simulant was treated with hydrochloric acid (HCl) to dissolve the anorthosite.Silica remained as a precipitate, while the calcium and aluminium dissolved into solution.After further sparging, aluminium chlorite hexahydrate (AlCl3•6H2O) precipitated out of solution and upon completion of a double calcination, alumina was produced.The result obtained in the thesis demonstrates that resource extraction could be accomplished on the Moon using minimal Earth-sourced reagents; however, to achieve desirable levels of purity an effective beneficiation step will have to be put in place to generate high quality feedstock.Professor, Mechanical and Aerospace Engineering (MAAE) department, for his valuable insight, support, and advice throughout my research.He has given the latitude to explore and trust to achieve the goal that we had set out.I also which to gratefully acknowledge Beth MacLarty-Halfkenny and Dr. Brian Cousens from the Carleton Earth Sciences Department, without their support and insight this thesis would not have been possible.Further, I would like to thank Xavier Walls who has been at my side throughout this endeavour and has coached me in the mystic arts of chemistry.His insight throughout the conduct of this experiment has helped me greatly.I wish him all the best in carrying on with the follow-on research that will unfurl from this
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".