Luzheng Chen, Dahe Xiong, in Progress in Filtration and Separation, 2015. 2.2.2 Disc and Roll Magnetic Separators. In the past, cross-belt and rotating disc high-intensity magnetic separators were used for concentration of relatively coarse weakly magnetic particles such as wolframite and ilmenite, etc., under dry conditions.In the operation of these two magnetic separators, material is