Siderite’s weak magnetic properties make it amenable to strong magnetic separation technologies. This beneficiation method is especially effective when dealing with ores that contain multiple iron minerals, some of which may possess stronger magnetic properties. Magnetic separation also pairs well with magnetization roasting, enabling further upgrading.
Strong magnetic separation employs high-intensity magnetic fields to attract siderite particles while rejecting nonmagnetic gangue. Wet high-intensity magnetic separators (WHIMS) are the primary equipment used for this purpose. These machines provide adjustable magnetic intensity, allowing operators to fine-tune separation performance.
In many operations, beneficiation begins with weak magnetic separation to remove strongly magnetic minerals such as magnetite or hematite. This reduces gangue content and enhances the efficiency of subsequent strong magnetic separation.
Magnetic separation is influenced by ore grade, particle size, and roasting behavior. Pre-roasting siderite can significantly improve its magnetic response. Therefore, magnetic separation often forms part of a staged, optimized beneficiation strategy.
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