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World Authority in Separation Technologies
Eriez | World Authority in Separation Technologies
World Authority in Separation Technologies

Eriez Wet Drum Separators

For automatic, continuous recovery of magnetite or ferrosilicon in heavy media operations and concentration of ferrous and weakly magnetic ores


Wet Drum Separators



Eriez Wet Drum Separators

Eriez’ Drum Separators are setting industry standards. The newest advances in magnetic circuitry design, plus over a quarter of a century of experience with solid/liquid separation, are combined in Eriez Wet Magnetic Drum Separators.

Innovations in both magnetic circuit design and materials of construction are applied to Eriez wet drum magnetic separators. This results in maximum magnetite recovery while operating with a minimum amount of wear and maintenance. Refinements in the magnetic circuit, tank design, and drive system have resulted in further improvements in metallurgical performance and operation.

Features & Benefits:

  • Strongest, most effective magnetic elements in the industry
  • Stainless steel encapsulated magnetic element
  • One piece stainless steel drum shell
  • Abrasion–resistant aluminum or stainless steel end flanges
  • Double–row, self–aligning ball bearings easily accessible without drum disassembly
  • Accurate drum positioning at factory eliminates field adjustments
  • Modular tank for easy installation
  • Full width overflow weirs
  • High volume input
  • Low initial cost
  • Now available with high energy rare earth magnets

Wet Drums for Heavy Media Duty

Wet drums in heavy media applications provide continuous recovery of magnetite or ferrosilicon. Eriez has set the industry standards in the heavy media industry developing both the design criteria of the magnetic circuit and the benchmark of operation. The 750 gauss Interpole magnetic element, developed by Eriez, is the most acclaimed magnet of engineering standards in the industry. Eriez has also set the benchmark for wet drum performance. The culmination of various in–plant tests has demonstrated that the separators will achieve magnetite recoveries in the 99.9+ percent. (This is based on magnetite losses of less than 1 gram/gallon of non–magnetic effluent).

Two basic tank styles are offered. The drum rotates in the same direction as the slurry flow in the concurrent tank style. The slurry enters the feedbox and is channeled underneath the submerged drum. The slurry then flows into the magnetic field generated by the drum. The magnetite is attracted by the magnetic field, collected on the drum surface, and rotated out of the slurry flow. This tank style results in a very clean magnetic product.

The counter–rotation tank style is preferred for heavy media applications. The drum rotates against the slurry flow in the counter–rotation tank style. The slurry enters the feedbox and flows directly into the magnetic field generated by the drum. The magnetite is attracted by the magnetic field, collected on the drum surface, and rotated out of the slurry flow. Any magnetite that is not immediately collected will pass through to a magnetic scavenging zone. The short path that the magnetic material must be conveyed between the feed entry point and the magnetics discharge lip, combined with the magnetic scavenging zone, results in high magnetite recoveries.
















Wet Drums for Concentration Duty

Wet drum magnetic separators are the most vital part of the upgrading process in magnetite concentration. The upgrading of primary magnetite is always accomplished with wet drum separators. Mill feed is typically upgraded to 65+ percent magnetic iron using a series of wet drum magnetic separators. The number of magnetic separation stages required to upgrade the ore is dependent on the magnetite content and the liberation characteristics of the ore.

The Eriez Wet Drum Magnetic Separators is engineered and fabricated to provide reliable operation in demanding applications. The separator is designed for the continuous treatment of coarse milled ore providing a high level of availability. The tank and drum are fabricated from heavy gauge stainless steel with wear plate in impact areas. Wear areas are protected with hot vulcanized rubber. The drum utilizes heavy–duty spherical roller bearings with a B–10 life of 100,000+ hours. The drive system utilizes a Mill and Chemical Duty motor coupled to a shaft mounted gear reducer complete with Taconite Seals.

The feed enters the separator at the bottom of the tank and the drum rotates in the same direction as the slurry flow. This tank also has a scavenging zone. The nonmagnetics must migrate through the magnetic field to a full width overflow. This design, with the full width overflow, allows the tank to be self–leveling. There are no tailings spigots that must be adjusted to match the flow of the separator feed. This design is most effective for producing a clean magnetite concentrate. The magnetic element should incorporate several agitating magnetic poles to provide a high degree of cleaning. Since the finisher feed consists of fairly well liberated magnetite, extreme magnetic field strengths are not required for collection.

Document Download: Wet Drum Separators Brochure

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