Abstract: As the core component of the high-gradient magnetic separator (HGMS),the structure of the ferromagnetic matrix box directly affects the separation efficiency. Traditional matrix boxes are prone to causing fluidization of the slurry during separation,leading to significant loss of magnetic particles and a substantial reduction in capture efficiency. Therefore,developing an efficient anti-fluidizing ferromagnetic matrix box is crucial for enhancing HGMS performance. This study employed COMSOL Multiphysics multi-physics simulation software to simulate and analyze the particle capture effectiveness of the antifluidizing matrix box during high-gradient high magnetic separation. By comparing the motion trajectories of particles in traditional versus anti-fluidizing matrix boxes,the predictive accuracy of numerical simulation for material separation behavior was validated,thereby determining the optimal structural parameters for the anti-fluidizing matrix box. Phase analysis of zinnwaldite ore was conducted using chemical analysis,optical microscopy,and scanning electron microscopy ( SEM). Comparative tests (" one roughing-two scavenging-two cleaning" ) were performed using an HGMS equipped with both a conventional matrix box and the anti-fluidizing matrix box. The results demonstrated that after the " one roughing-two scavenging-two cleaning" process: products from the anti-fluidizing matrix box achieved an Li 2O recovery rate of 59. 81% and a grade of 1. 683%. Products from the traditional matrix box yielded an Li 2O recovery rate of 46. 83% and a grade of 1. 697%. The concentrate grades obtained with both types of matrix boxes were similar,but the recovery rate using the anti-fluidizing box was approximately 13 percentage points higher. This study confirms that the anti-fluidizing matrix box effectively enhances HGMS performance,providing both theoretical and experimental foundations for the structural optimization of ferromagnetic matrix boxes. 

Key words: zinnwaldite,high-gradient magnetic separator,analog simulation,matrix box,anti-fluidizing