Development of belt type matrix permanent high gradient magnetic separator

A belt type matrix permanent high gradient magnetic separator (BTMPHGMS) with middle field strength has been developed. The high gradient matrix belt circulates through the separating zone, thus providing continuous separation of magnetic minerals from nonmagnetic ones, which improves the process of the intermittent operation of common HGMS. The operating parameters are based on test work. The magnetic system consists of NdFeB permanent magnets with stored energy 255 kH/m(3) and magnetizing induction intensity 1.1T. A special magnetic circuit structure with iron-cladding is adopted to provide an optimal design, and a simple equation is derived to calculate the magnetic field strength on the basis of magnetic circuit law. The typical industrial scale tests show that the separating efficiency and performance of the BTMPHGMS are similar to those of the HGMS with electromagnetic field, but the manufacture and operating costs of the former are much lower.