A novel method for extracting metals from asteroids using non-aqueous deep eutectic solvents.

Area of Science:

• Astrogeology
• Materials Science
• Chemical Engineering

Background:

• Extraterrestrial mining is crucial for space exploration resource acquisition.
• Deep eutectic solvents (DES) offer low vapor pressure and potential synthesis from waste, making them suitable for space applications.

Purpose of the Study:

• To investigate the catalytic dissolution of metals from meteorite samples using a DES.
• To assess the feasibility of using DES for extraterrestrial metal processing.

Main Methods:

• Chemical micro-etching experiments were performed on three meteorite types (H3, H5 chondrites, IAB-MG iron meteorite).
• A DES composed of choline chloride and ethylene glycol was used with iodine and iron(III) chloride as oxidising agents.

Main Results:

• The DES effectively leached Fe-Ni rich phases and troilite (FeS) from the meteorite samples.
• Silicate minerals and other phases remained largely unreactive under the experimental conditions.

Conclusions:

• Deep eutectic solvents demonstrate potential for selective metal extraction from extraterrestrial materials.
• This method could support in-situ resource utilization for future space missions.