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Magnetic susceptibility of minerals in high magnetic fields.

Authors
Dahlin-DC; Rule-AR
Source
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9449, 1993 Jan; :1-15
NIOSHTIC No.
10003174
Abstract
The U.S. Bureau of Mines investigated the magnetic susceptibility of minerals as a function of magnetic field strength to determine how it might affect the potential for high-field magnetic separation as an alternative to other separation technologies. Single-mineral concentrates were prepared from specimens from the same deposit to compare magnetic susceptibilities of minerals that occur together and from specimens from different deposits to compare magnetic susceptibilities of like minerals. A vibrating-sample magnetometer with a superconducting magnet capable of producing a magnetic field of 7.16 X 10(6) A/m (90 kOe) was used to measure the magnetic moment of the samples. The data were then converted to specific magnetic susceptibility data and plotted as a function of magnetic field strength. Cursory studies were also completed on the effects of iron content and oxidation roasts on magnetic susceptibility in high fields. The results showed that magnetic susceptibility is essentially constant in magnetic fields above those needed to saturate ferromagnetic constituents. Although magnetic susceptibility is influenced by iron content and by thermal treatment, the changes are not large enough to influence separations in fields above 1.59 x 10(6) A/m (20 kOe).
Keywords
Sulfide-minerals; Gangue; Superconducting-magnets; Iron-ores; Magnetic-permeability; Separation; Metalliferous-minerals
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-189512
NTIS Price
A03
Identifying No.
RI-9449
NIOSH Division
ALRC
Source Name
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9449
State
OR
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