Other
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000srrt.conf...35m&link_type=abstract
Space Resources Roundtable II, p. 35
Other
Hydrogen Production, Moon, Contaminants, Degradation, Deposits, Heavy Metals, Minerals, Materials Recovery, Beneficiation, Clementine Spacecraft, Craters, Electrolysis, Lunar Environment, Lunar Prospector, Surface Temperature, Temperature Gradients
Scientific paper
Hydrogen and other volatiles were detected in the lunar regolith returned by the Apollo missions and in the data returned from the Clementine and Lunar Prospector satellites. The hydrogen concentration appears to vary by a factor of 34 between equatorial and polar crater locations. The recovery methods will vary with the nature of the deposits and the environmental conditions. Yields depend on process difficulty and available resources. Available resources include the H2/water concentrations, thermal gradients, vacuum, insolation and regolith fines. Process difficulty depends on water concentration, environment, characteristics of the equipment and logistics. Production rates depend on equipment characteristics and logistics, The distribution and disposition of volatiles and vapor mobilized elements at a fine scale are only known for a limited number of locations. Experience in terrestrial mining, beneficiation and processing has shown that small variations in the grade or associated contaminants of an ore can have a marked effect on the efficiency of these operations. These can range from operational impairment of machinery to degradation of process chemistry. The appropriate processing methods will vary with the location and the concentration of water. For equatorial and mid latitude locations, hydrogen production could be combined with a high temperature whole soil process like Magma Electrolysis both of which requires heating of the soil to high temperatures. It has been reported that free mercury in the lunar environment can also migrate to the poles. Potential chemical interactions of mercury and other volatile heavy metals is also addressed.
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