Efficient Approach to Fine Particle Separation Using Mechanical Stirring by a Fluctuating Magnetic Field

Steelmaking slag is by-product of a steelmaking process and includes many elements. The steelmaking slag has expansion properties originated from free-CaO. Therefore, the untreated steelmaking slag is used only for restricted purpose. On the other hand, the steelmaking slag includes many ferrous in it. This thesis proposes an efficient approach to dry fine particle separation using mechanical stirring by a fluctuating magnetic field which is generated by a magnet roll with multiple poles. The quick change of magnetic field generates strong agitation to attracted particles. Even if amount of feeding is too much to separate, the fluctuating magnetic field would improve the efficiency of the separation. As a result, the throughput of the proposed method was 10 to 100 times higher than that of conventional magnetic separators under a dry condition. Moreover the overall separation efficiency of this method was more than 2 times that of a conventional devices.