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This paper regards feed mine as a mixture of intergrowths and purenon-magnetic mineral particles, presents a method to calculate the evaluationvariables such as grade and recovery in high gradient magnetic separation(HGMS). A idealized capture model is constructed in which the interactionbetween particles is not taken into account and only for the initialaggregation condition that the separator has the highest capture efficiency. Inthe model we adopt the functions that use nominal particle radius and magneticmineral content as independent variables to describe volume fractiondistribution and capture efficiency of intergrowths respectively. Throughadding multi-wire magnetic fields and setting periodic boundary conditions inflow field analysis, we modify the computational domain of the single-wirecapture theory to a element domain that periodically appears in the multi-wirematrix. By means of finite element software, particle trajectories, flow fieldand magnetic field are clearly exhibited, and then capture efficiency functionis obtained by interpolation method. The calculated evaluation variablestheoretically represent the best performance of magnetic separator for a givenfeed. They can assist mineral engineers to evaluate or compare the effects ofdifferent magnetic separation systems in advance. We use removal of ironimpurity from kaolin as an example to illustrate the presented calculationmethod. The results quantitatively compare the evaluation variables of theseparation at different magnetic fields and show that the advantage of highermagnetic field in separation efficiency decreases with the increase ofsaturation magnetization of magnetic mineral.

Calculation of Evaluation Variables for High Gradient Magnetic Separation with an Idealized Capture Model