Manufacture and Performance Test of 3.5 T High Temperature Superconducting Coils for the Magnetic Separation

With the development of the high temperature superconducting (HTS) materials technology, the manufacturing process of the HTS tape has been further improved and hundreds of meters of HTS tapes have been applied in industry. In beneficiation field, the magnetic separation facility of using HTS technology can not only improve the work efficiency of the material purification and separation, but solve the problem that some weak magnetic materials are difficult to separate due to the high magnetic intensity and gradient. Today, a 3.5 T HTS magnetic separation facility cooled by a cryocooler was manufactured in China. This paper focuses on the manufacturing process and performance test of the HTS magnet. Some new structure was adopted in the design and manufacture of the magnet and verified in the magnet performance test. Test results indicated that the magnet could be cooled below 20 K by the direct heat conduction, the center magnetic field could reach 3.57 T and the center axis uniformity of the magnetic field was better than 95% in the range of ±100 mm from the mid-plane. In short, the magnet design is reasonable and it is likely to be applied on other similar magnet in future.