ultrasonic testing of high gradient magnetic separation

Title: ultrasonic testing of high gradient magnetic separation
　　Author: Thomas Chan Fang
　　Degree-granting units: Inner Mongolia University of Technology
　　Keywords: fine particles;; hematite;; high gradient magnetic separation;; ultrasonic radiation
　　Summary:
　　As human growing demand for steel and mineral resources depleted, development and utilization of low-grade refractory iron minerals more and more attention, and mineral processing industry has become a difficult and hot spots. Bayan Obo's in poor flotation Baotou rare earth oxide ore and tailings are weakly magnetic hematite type, iron, niobium, rare Neodymium Magnets earth content is high, with a high utilization value. As we all know, high gradient magnetic separation is sorting an important means of weakly magnetic minerals, but it is difficult to obtain high-grade iron ore, and the capacity is low. This is because the high gradient magnetic separation using the embedded magnetic media, easy to plug the small dressing room, concentrate on magnetic media in the absence of line cleaning measures, easily mixed with gangue.
　　To solve the above problems, this paper presents the use of ultrasonic vibration technology online, supporting high gradient magnetic separation, to the use of ultrasonic vibration and air into a mechanical mixture of magnetic media used to alleviate problems and improve the concentrate grade. To this end, a trial of high-gradient magnetic separation ultrasonic test equipment, the use of the device of the ultrasonic frequency, power and other parameters of low-grade hematite magnetic effect. As a case, the raw material used in poor Bayan Obo rare earth oxide ores and flotation tailings.
　　Process mineralogy studies have shown that the flotation tailings all rare-earth iron was 13.46%, iron minerals monomer dissociation degree of 73.79%, total iron oxide ore in the poor was 33.1%, monomer dissociation degree of 81%, mainly iron minerals are hematite. However, a high degree of dispersion, cloth embedded relationships are more complex, are fine refractory low-grade hematite type.
　　Technology test studies have shown that the recovery rate close to the case, ultrasound can load high gradient magnetic separation of iron concentrate grade increased 2%. For thin election tailings, the magnetic field in the roughing 0.8T, selection of the http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets magnetic field 0.3T, medium fill rate of 10.62%, slurry flow rate of 4.2cm / s, 20% pulp density, ultrasonic frequency of 28KHz, power of 120W in the case of iron ore grade of 46.25%, 61.20% recovery rate; for the poor and oxide ores, in roughing magnetic field 0.6T, selection of the magnetic field 0.15T, medium fill rate of 9.63%, slurry flow rate of 4.2cm / s, 20% pulp density, ultrasonic frequency of 28KHz power 120W in the case of iron concentrate grade reached 62.5%, 77.9% recovery rate.
　　Degree Year: 2010