Dry Low Intensity Magnetic Separators (DLIMS)

DF Drum Separators operate in a way similar to other drums but with some important differences. Older type, slow, agitating or radial eld drums employ only magnetic attraction and gravity as the separating forces. Their capacity is limited due to the slow speed of rotation of the drum shell. The DF High Speed Drums employ high strength magnetic elements and high speed shell rotation. This makes it possible to introduce a third factor in the separation of materials – inertia.

To take maximum advantage of all these forces, Eriez engineered new, powerful magnetic circuits which permit high rotational speeds for the drum shell. Carefully balanced magnetic attraction, eld depth and shell speed achieve an ef cient, high capacity machine which effectively throws out ne non-magnetics and retains the magnetics.

SEPARATOR REQUIREMENTS VARY

Different applications require unique con gurations of features and the Eriez line includes models for every purpose. Different magnetic elements and shell speeds are indicated for materials of various sizes and magnetic permeabilities. Eriez provides elements with a varying number of poles in axial (agitating) eld design to produce high grade magnetic concentrates plus a high strength radial (nonagitating) eld design for use where a clean, non–magnetic product is the most important consideration. A wide range of peripheral drum speeds variable from 300 to 1500 fpm (91 to 457 mpm) is provided to suit all applications. Capacity per unit of magnetic width varies from approximately 5 to 40 tph per foot (14.7 to 119.0 mtph per meter) and depends to a great extent on feed particle size, magnetic permeability and drum speed.

All DF Separator models require a feed with certain common characteristics. The magnetic fraction to be separated must be ferromagnetic and dry, and the feed size should be –1" (–25 mm). Selectivity increases when the products to be separated are within four Tyler mesh sizes. moisture adversely affects separator performance but can be tolerated as long as the feed is free-flowing.

Capacity, grade and recovery are directly related to the peripheral speed of the drum. For high recovery of magnetics or puri cation of non– magnetics coarser than 1/8" (3mm), the model DF-A10 or DF-r at a relatively slow peripheral shell speed is used. The DF-A25 is used at moderate speeds for cobbing or roughing concentration jobs. When a very high grade, nished magnetic concentrate is desired, the DF-A50 is used at a higher shell speed.