Abstract
The principle of action of the barrier separator for beneficiation of coarse weakly magnetic ores is described. New data of laboratory-scale investigations of beneficiation of manganese ore and mineral sands are introduced. The results of tests in the Volnogorsk State Mining and Metallurgical Plant (VSMMP) show high technological effectiveness and reliability of the experimental separator.
Highlights
High-intensity magnetic separation (HIMS) of weakly magnetic ores in roll and rotary magnetic separators includes attraction of magnetic particles at rolls or at grooved ferromagnetic plates and continuous removal of the attracted particles from the zone of a strong magnetic field for their further discharge in the magnetic product
The utilization factor of the magnetic circuit of such separators is low because a considerable part of space between the poles is used only to transport magnetic particles from the zone of their attraction to the zone of their discharge
A barrier magnetic separator consists of a magnetic circuit and inclined channels, which are placed in a gap between poles
Summary
High-intensity magnetic separation (HIMS) of weakly magnetic ores in roll and rotary magnetic separators includes attraction of magnetic particles at rolls or at grooved ferromagnetic plates and continuous removal of the attracted particles from the zone of a strong magnetic field for their further discharge in the magnetic product. It leads to intensive abrasion of the rolls by coarse material This results in a change of their shape and further inevitable reduction of recovery of magnetic particle. Frantz Co., Inc, tried to develop this separator for industrial application He did not succeed to remove the main obstacle, namely the clogging of the channels by magnetic particles, which are attracted to the walls. The data show that the laboratory scale barrier separator, having 13 mm wide channel produces a high grade concentrate 42.4% Mn at high recoveries of manganese in the magnetic product (96.0%) and of free quartz in the non-magnetic product (72.8%). As in the case of the manganese ore, the scalping magnetic separation completely eliminated accumulation of particles of increased magnetic susceptibility on the walls of the channel
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