Magnetic separator having high rate of field change capability

摘要

A large magnetic separator for separating magnetic fines from nonmagnetic product is equipped with a dual mode power supply. A first mode of the dual power supply is provided for accelerated imposition of the design magnetic field. A second mode of the dual power supply is provided for the maintenance of the desired magnetic field at an improved power factor, which field is in the range of 20 kilogauss. With the field imposed, a canister centrally placed in the magnet with a magnetic stainless steel wool matrix separates magnetic fines from nonmagnetic product until the matrix is saturated. Upon saturation of the matrix, the power supply dissipates to the power grid electrical energy from the collapse of the magnetic field. There results a larger classifying duty cycle of the high stationary magnetic fluid utilized for classification.