... equipment for processing fine, feebly magnetic minerals, such as hematite, limonite, wolfram, limonite, and tantalum-niobium, etc. In recent years ... magnetic circuit with energizing coils made of copper tube and cooled internally by water. Grooved plates made of ... of equipment for processing fine magnetic minerals, such as hematite, limonite, wolfram, limonite and tantalum-niobium. Recently, this Iron ...