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May 27, 2022

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Scientists are extracting oxygen from lunar dust facsimiles

Getting oxygen (and metal) from lunar dust is a possibility that would greatly increase our resources to make colonies on the Moon.

Gianluca Ricciodi Gianluca Riccio
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oxygen from lunar dust, an example of a colony

The reconstruction of a lunar colony that uses oxygen collected on site by the regolith found in the soil and rocks.

January 18 2020
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A team of European researchers is working on a system capable of producing breathable oxygen from simulated samples of lunar dust.

"Being able to acquire oxygen from lunar dust would be extremely useful for future colonists, both for breathing and in the local production of rocket fuel", has explained Beth Lomax, chemist at the University of Glasgow, in a press release from the European Space Agency (ESA).

With the help of his colleague Alexandre MeurisseESA researcher Beth is currently testing a prototype generator that could eventually lead to the production of oxygen from lunar dust.

The system is currently being tested in the materials and electrical components laboratory of the European Space Research and Technology Center (ESTEC), which is based in Noordwijk, the Netherlands.

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oxygen from lunar dust, Beth Lomax and colleague Alexandre Meurisse
Beth Lomax of the University of Glasgow and fellow ESA researcher Alexandre Meurisse prepare to produce oxygen and metal from simulated moon dust at ESA's Electrical Materials and Components Laboratory. Image: ESA / A. Conigili

Moon dust oxygen: the prototype works

Sure, it will need to be optimized to make it suitable for use on the Moon (for example by reducing its operating temperature), but the prototype works. Lomax and Meurisse are currently working on and extracting oxygen from lunar dust facsimiles, but given the composition of the material they are pretty confident that their approach will work on actual moon dust as well.

According to ESA, the lunar dust samples known as regolith that returned to Earth during the Apollo missions were made up of about 40-45% oxygen. ESTEC scientists are developing a technique that can push this oxygen out of the dust.

The oxygen in the regolith is trapped in the form of oxides, which form as minerals or glass within the powder. It is necessary to work chemically to extract this oxygen, as described by the ESA itself:

ESTEC's extraction of oxygen is taking place using a method called "molten salt electrolysis". It involves placing the regolith in a metal basket with molten calcium chloride salt to serve as an electrolyte, heated to 950 ° C. At this temperature the regolith remains solid but oxygen is released.

To be precise: the passage of a current through the regolith immersed in this salt causes the extraction of oxygen and the conversion of the regolith into usable metal alloys. And it is no coincidence that this process was developed by Metalysis. Metalsys is a UK based company that uses this technique to produce metals and alloys. Beth Lomax collaborated with Metalysis while she was working on her PhD, and is now leveraging the concept at ESTEC.

oxygen from lunar dust, an example of a facsimile
The lunar dust facsimile used to test the prototype that extracts the oxygen oxygen. Image: Beth Lomax / University of Glasgow

Store oxygen

Since Metalysis treated the resulting oxygen as an unwanted byproduct, the system had to be optimized to capture and measure it. At present, the system by discharging oxygen into an exhaust pipe, but future versions will be able to store oxygen in the long term.

ESTEC's approach to regolith is also interesting which, after releasing its oxygen, turns into a metal. The team is currently examining various ways to harness this metal in a lunar environment. For example by transforming it into compounds for 3D printing (I talked about it a while ago in an article hosted by Beppe Grillo's blog).

All this work is an example of a system that could work on the moon. ESTEC scientists aim to have a functional version ready for the middle of this decade. With such a device available, future explorers and lunar colonists (and maybe on Mars) will be able to breathe a little easier by extracting oxygen directly from moon dust.

tags: Spatial colonizationmonthOxygenmoon dustregolith
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