Abstract
Traditional dry magnetic separation has poor separation efficiency for fine-grained materials, and combining airflow and a magnetic field may be one of the most effective means to improve it. Based on the pneumatic drum magnetic separator developed by our team, an improved pneumatic magnetic separator with a segmented flow field is proposed, which pushes materials to move along the separation surface. Analysis of flow field in the separation zone and the forces on particles show that the improved pneumatic magnetic separator makes it easier to collect fine magnetic particles, while nonmagnetic particles are more easily removed by airflow. Separation test results also show that the iron grade and the recovery of concentrate improved from 37.89% and 74.75% to 51.76% and 91.79%, respectively. The separation efficiency of the pneumatic drum magnetic separator has been remarkably improved by optimizing airflow field in the separation zone.
Highlights
Magnetic separation is a technology to separate magnetic components from nonmagnetic materials in a nonuniform magnetic field, based on their magnetic differences [1,2].In recent years, due to the rising costs associated with environmental protection and the increasing demand for iron in polar regions, dry magnetic separation highlights its greater application advantages [3]; for fine-grained iron ores, the separation efficiency of dry magnetic separation is lower than that of wet magnetic separation
Due to the rising costs associated with environmental protection and the increasing demand for iron in polar regions, dry magnetic separation highlights its greater application advantages [3]; for fine-grained iron ores, the separation efficiency of dry magnetic separation is lower than that of wet magnetic separation
The separation efficiency of industrial dry magnetic separation has been improved, mostly by removing ultrafine particles in advance [12,13], which is similar to the separation of fine weak magnetic materials in wet magnetic separation, where the ultrafine magnetic particles will be lost with water [14]
Summary
Due to the rising costs associated with environmental protection and the increasing demand for iron in polar regions (extremely cold and hot regions), dry magnetic separation highlights its greater application advantages [3]; for fine-grained iron ores, the separation efficiency of dry magnetic separation is lower than that of wet magnetic separation. This is mainly because the mechanical inclusion caused by magnetic agglomeration and the nonspecific adhesion between fine particles in dry magnetic separation are more severe than that in wet magnetic separation [4,5,6]. The separation efficiency of industrial dry magnetic separation has been improved, mostly by removing ultrafine particles in advance [12,13], which is similar to the separation of fine weak magnetic materials in wet magnetic separation, where the ultrafine magnetic particles will be lost with water [14]
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