Factors Related to Mineral Separation in a Vacuum.
NTIS: PB 192 299 :13 pages
Under a very high vacuum of 10-8 torr the transfer of terrestrial mineral beneficiation methods to the vacuum ambience of extraterrestrial locations such as the lunar surface was investigated. In the size range for the electrostatic and magnetic separation of ores (minus 35 plus 150 mesh) there is no adhesion of particles produced by crushing and grinding due to the limited contact area, and for repeated contacts area size has a frequency of occurrence according to the normal law. The photoelectric effect which is successful in separating a few minerals in an air ambience has a wider application in a vacuum, while the lack of air viscosity and sound transmission provides for high feed velocities and the adaptation of particle vibration to dispersion and grinding. Contact electrification is reversible upon return to atmosphere.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 192 299