Analysis of Dry and Wet Magnetic Separation Based on the Productivity of the Magnetic Separator
The magnetic separator used in this study is designed to process crushed ore that has typically undergone pre-desliming. The particle size distribution curve of the feed material is either linear or convex, and the results of both dry and wet magnetic separation were analyzed under varying productivity levels.
During dry selection, the material (which includes hematite and quartz mud) was processed with a particle size range of 2-0 mm. Approximately 4% of the particles were smaller than 74 μm, and the roller's peripheral speed was set at 39 cm/sec. In contrast, during wet selection, the washed manganese ore had a particle size of 3-0 mm, with about 2% of the particles below 74 μm. The rotating roller's speed varied at 44, 63, and 86 cm/sec respectively, and the relationship between beneficiation efficiency and unit productivity was examined.
By comparing the data on beneficiation efficiency and unit productivity from both dry and wet magnetic separation methods, it was observed that as productivity increases, the efficiency gradually declines, although not sharply. This makes it challenging to determine the optimal productivity level for processing a specific type of ore under given sorting conditions.
To determine the normal productivity of a magnetic separator, the beneficiation efficiency should not fall below 70%. Under these conditions, the unit productivity of the dry-roll magnetic separator for 2-0 mm material is approximately 25 kg/hr·cm, while the wet magnetic separator for 3-0 mm ore has a unit productivity of around 15 kg/hr·cm.
In wet selection, increasing the roller's peripheral speed from 44 to 63 cm/sec can enhance the manganese content and overall beneficiation efficiency in the concentrate. However, further increasing the speed to 86 cm/sec may reduce the recovery of manganese due to increased centrifugal force acting on the ore particles, which negatively affects the beneficiation efficiency.
This article is sourced from: Magnetic Separator: http://
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