PERMANENT MAGNETS
In beneficiation plant , Most of the weakly magnetic minerals, such as garnet, ilmenite , and magnetic impurities in silica sand , can be effectively separated with a magnetic separator that has a flux density greater than 6,000 gauss. For nearly a century, induced-roll magnetic separators were the only economically viable unit operation in these applications. In spite of their considerable success, induced-roll separators have certain limitations in their selectivity and application. The development of permanent-magnet technology during the last two decades has reestablished the importance of magnetic separation and has increased the efficiency of fine-particle separations that were not successful with induced-roll magnets. Principle and Design In the last decade, magnetic separation technology has undergone a revolution. Research in material science and ceramic technology has culminated in the development of new permanent rare-earth magnets and superconducting alloys that can b...