Permanent Drum Magnets

Permanent drum magnets are versatile, robust magnetic separators that are well suited to a wide range of applications, including those in the food, plastics, powder and bulk, grain and milling, and metal recycling industries. They excel at separating small ferrous and paramagnetic particles from dry granular materials, in addition to being highly efficient at recovering and separating larger sized particles of ferrous metal. Permanent drum magnets are available in a wide range of diameters, feed widths, and magnetic strengths—available in standard ferrite and high-intensity rare earth. Additionally, permanent drum magnets can be constructed according to axial or radial magnetic element designs.

Permanent drum magnets provide you with high capacity processing with limited maintenance requirements.

Description

The design of permanent drum magnets utilizes either adjustable 120-degree or 190-degree magnetic element arc, which is positioned inside a non-magnetic shell (often made of stainless steel). In operation, the shell rotates around the magnetic element. The rotation speed is dependent on the volume of material being processed and the diameter of the drum. To maximize the projection of magnetic strength into the product stream, magnets are mounted onto heavy-duty back plates. This significantly enhances the drum magnet’s performance. Additionally, by doing so, this reduces leakage of the magnetic field into the shaft and bearings, which in turn extends their service life.

Depending on your application, a drum magnet’s magnetic element will be constructed to produce either a radial or axial magnetic field.

Permanent drum magnets are available in many different size options, and our custom design capabilities allow you to specify your diameter and width of choice. Typically, drum magnets with smaller diameter shells (24” or less) are used to handle materials with a small particle range, whereas drum magnets with larger diameters (18” or more) are used to handle larger particles, such as bulky material in recycling applications or very high flow rate materials like grain loadouts.

A permanent drum magnet can be constructed with either fully stabilized ferrite magnets, or the highest grade of rare earth neodymium magnets.

Permanent drum magnets are frequently paired with other equipment. For example, in recycling, permanent drum magnets are placed prior to Eddy Current Separators in order to create a ferrous metal separation module. In this module, the drum magnet works to separate and recover ferrous metals, so that then the Eddy Current Separator will receive non-magnetic fraction that it can then recover non-ferrous conductive metals from. A drum magnet’s strength depends on the material it is handling, and it is important to ensure you are selecting the correct magnet strength for the materials you are handling.