SUPERCONDUCTING MAGNETS
In beneficiation plant , High magnetic fields (up to 2 tesla) are generated by passing current through a resistive coil or by permanent magnets. The development, through the use of finite element analysis techniques, of newer computer models has helped to achieve higher magnetic force. However, there is a logical maximum magnetic field for both the resistive coil and permanent magnet. Resistive coils are limited by the intrinsic resistance applied by the windings; the field strength of existing permanent magnets can be increased only marginally by modifying the magnet geometry. In the future, new magnetic materials may help to overcome this limitation. Currently, superconducting magnets are the only economically and technically viable way to achieve field strengths as high as 5 tesla. Fundamental requirements of superconducting magnets are a suitable conductor and a cryogenic system. During the last decade, extensive research in material science has resulted in new alloys that are s...