The strongest magnetic roll separator available on the market enhances certain industrial minerals purity to levels not reached previously. Exceptionally strong forces can also be utilized for processing relatively fine particles at feed rates several times greater than for prior art electromagnetic induced roll separators. Since the unique machine does not work with an air-gap, … Read more
The separation of fine sulfides becomes increasingly difficult at fine particle sizes. Potential fine size separation methods are froth flotation and magnetic separation. The mineral sulfides, with the exception of pyrrhotite, are either weakly paramagnetic (e.g. chalcopyrite) or diamagnetic (e.g. molybdenite). Those which are paramagnetic can only be separated using high-gradient magnetic separation (hgms) at … Read more
The McAllister Ta-Sn deposit, located in Coosa County, Alabama, consists of a series of complex pegmatite dikes and pipes which intrude a granite pluton formation. Wodginite ((Ta, Nb, Sn, Mn, Fe)16O32) is the primary tantalum mineral. The deposit was discovered in 1982 by Callahan Mining Corporation, of Phoenix, Arizona, through stream-sediment reconnaissance and soil geochemical … Read more
Laboratory investigations on the possibility for magnetic separation of sulphide minerals are reported. A survey of several sulphide ores and flotation concentrates shows that magnetic separation in most cases is not a suitable primary method of beneficiation. However encouraging results have been obtained in concentrate purification. Traditionally magnetic separation is associated with iron bearing materials/ … Read more
The most common zirconium bearing minerals are zircon, the zirconium silicate ZrSiO4, typically produced from heavy mineral sands in Australia and India, and baddeleyite, the zircon dioxide ZrO2, produced for example at Phalaborwa. A much less common zirconium mineral is eudialyte, a trigonal calcium-zirconium silicate occurring in silica-undersaturated nepheline syenite complexes, such as the Lovozero … Read more
Wet magnetic separation methods for recovering hematite and chromite fines and ultrafines are investigated in this paper. These methods include wet high intensity and high gradient magnetic separations, carrier or “piggy-back” magnetic method, magnetic field-induced aggregation and magnetic seeding. This investigation indicates that wet magnetic separation is more efficient for fines and ultrafines whereas other … Read more
The process of magnetic separation is based on the differences among magnetic susceptibilities of various mineral species. Performed either wet or dry, the separation has application in both the recovery and concentration of value minerals, and in removing deleterious mineral constituents from a product stream. There are two major categories to be considered when addressing … Read more
Wolframite, sp. gr. 7.1 to 7.5, tungstate of iron and manganese, is feebly magnetic; specimens from some localities are reported to be strongly magnetic. Wolframite frequently accompanies cassiterite in tin ores, and on account of their similar specific gravities (cassiterite 6.4 to 7.02) these minerals may not be separated from each other by specific-gravity methods. … Read more
Chalcopyrite, sp. gr. 4.15 to 4.3, is too feebly magnetic to be separated raw, and must be roasted to either the magnetic sulphide or the magnetic oxide, these changes taking place in a manner similar to the behavior of pyrite. A one-minute roast at a red heat is sufficient to impart magnetism to chalcopyrite through … Read more
The specific gravities of blende (3.9 to 4.2) and siderite (3.7 to 3.9) are almost identical, and they may not be separated by any method based on this property. The most important application of magnetic separation in Europe has been the separation of siderite, or carbonate of iron, from blende. Many important ore bodies carrying … Read more