Analysis of Dry and Wet Magnetic Separation at Different Production Rates of the Magnetic Separator Based on Test Results
The magnetic separator used for ore feeding is typically applied to process crushed ore that has been pre-de-sanded. The particle size distribution curve generally appears as a straight line or a convex curve. This study examines the performance of both dry and wet magnetic separation under varying production capacities of the magnetic separator.
During dry magnetic separation, the material particles (which include hematite and quartz mud) are processed in the size range of 2-0 mm. Approximately 4% of the particles have a size less than 74 μm, and the peripheral speed of the roller is set at 39 cm/sec. In contrast, during wet magnetic separation, the washed manganese ore is processed within a size range of 3-0 mm, with about 2% of the particles being smaller than 74 μm. The rotational speeds of the roller were tested at 44, 63, and 86 cm/sec, respectively, and the relationship between beneficiation efficiency and unit productivity was analyzed.
By comparing the data on beneficiation efficiency and unit productivity between dry and wet magnetic separation, it becomes clear that as production rate increases, the efficiency gradually declines—though not sharply. This makes it challenging to determine the optimal productivity level for sorting a specific type of ore under given conditions.
To define the normal operating productivity of a magnetic separator, the beneficiation efficiency should not fall below 70%. Under these conditions, the unit productivity of the dry magnetic separator for processing 2-0 mm material is approximately 25 kg/hr·cm. For the wet magnetic separator handling 3-0 mm ore, the unit productivity is around 15 kg/hr·cm.
In wet magnetic separation, increasing the peripheral speed of the roller from 44 to 63 cm/sec can improve the manganese content and overall beneficiation efficiency. However, further increasing the speed to 86 cm/sec leads to a decrease in manganese recovery due to the increased centrifugal force acting on the ore particles, which negatively affects the efficiency of the process.
This article is sourced from: Magnetic Separator: http://
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