Separating efficiency of ferromagnetic particles and principle of low-intensity dry magnetic separator under different air supply modes: Based on multi-physical modeling.

Introducing airflow into the low-intensity dry magnetic separator (LIDMS) is an effective means to improve the separating efficiency of ferromagnetic particles under dry conditions. In this study, a multi-physical coupling model was established to compare the separating performance of LIDMS under four typical air supply modes. The result shows that Mode D can maximize the competing force along the normal direction of the drum due to the vertically outward air supply mode, and its separating performance is the best, especially for the particles with a fine diameter. The mechanism of airflow under different modes which enhances the LIDMS is expounded by analyzing the characteristics of the magnetic field and the flow field and calculating the forces on particles with various properties. We expect that this study could provide a reference for the dry separation of magnetic minerals and the development or optimization of LIDMS under airflow conditions. [Display omitted] • The performance of magnetic separation under different air supply modes is compared. • A multi-physical model is established to simulate the magnetic separation process. • The difference in separation performance is explained by analyzing the flow field and forces on particles. • The airflow in a normal direction can maximize the dry magnetic separation efficiency. [ABSTRACT FROM AUTHOR]