低品位鉄鉱石の粗選用磁選機に関する基礎的研究

抄録

For the effective concentration of low grade iron ore, the author developed a new top feed type magnetic roughing concentrator. The specifications of the structure of this concentrator is shoun in Fig.6. It consists mainly of two mechanical parts, the one is a shaking feeder equipped with magnets for the acceleration of consolidation trickling of magnetic particles, and the other is a drum type magnetic separator deeply immersed in water. Due to the shaking motion of the feeder, magnetic particles are previously stratified by their specific gravities and magnetic properties, thus magnetic particles are reasonably attracted to the magnetic drum. The fundamental characteristics of this concentrator were experimentally investigated by using iron sand. Fig. 8, 9 are the results concerning the Misawa iron sand (magnetite content m=1.9%) and Fig.10, 11 are the Iioka iron sand (magnetite content m=19.0%).
Fig.8, 10 are the relations between the peripheral speed v of the separation drum and the grade of talilngt, where the paremeter is feed rate F.
In the lower range of less peripheral speed than v=65m/min, the grades of tailing decrease to the order 0.00%.Consequently in the same lower range of the peripheral speed recoveries E increase to about 100%, which is shown in Fig. 9 and 11. From these fundamental investigations we confirmed that by the applications of the top feed method to the magnetic concentration low grade iron ore which could not be separated by the ordinary magnetic separator can be effectively concentrated.