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SLon vertically pulsating high gradient magnetic separator

The SLon® vertically pulsating high-gradient magnetic separator (VPHGMS) utilizes the combination of magnetic force, pulsating fluid and gravity to continuously separate magnetic and non magnetic minerals. The SLon possesses the advantages of high beneficiation ratio, high recovery, adaptability to varying particle sizes, and minimized matrix blocking. Customers find the SLon reliable, and easy to operate and maintain. Thousands of units have been successfully implemented in minerals processing plants worldwide. The modern technology offers many advances over traditional WHIMS type separators including greater efficiency with smaller sized particles, higher grade and recovery, and lower maintenance and operating cost.


  • High capacity
  • Low cost per ton
  • High availability
  • Superior fine particle separation
  • Conventional WHIMS replacement
  • Meets worldwide safety standards
  • Magnetic or non-magnetic product upgrading

Operating principle

Slurry is introduced to the matrix – housed inside the vertical separating ring – through slots in the upper yoke. The magnetic particles are attracted to the matrix and are then carried outside of the magnetic field where they are subsequently flushed to the magnetic concentrate trough. The non-magnetic, or less magnetic, particles pass through the matrix through slots in the lower yoke to the non-magnetic collection hoppers.

Magnetic strength

SLon units are offered in 0.6, 1.0 and 1.3 max Tesla versions with magnetic set points infinitely adjustable within the operating range. Magnetic intensity is based on the averaged value over the entire separating area rather than a single point max value achieved. Capturing intensity is even higher on the surface of the matrix. Example: The 1 Tesla version is modeled to reach 1.8 Tesla at the surface of a 2mm matrix. This helps explain why the SLon is outperforming other WHIMS claiming >1 Tesla fields.


  • Concentration of iron ore, ilmenite, chromite ore and other paramagnetic materials.
  • Purification of non-metallic minerals (feldspar, silica sands, etc.)
  • Fine particle applications (<20µm)
  • Replacement of conventional WHIMS

Vertical ring configuration

The ring is arranged in a vertical orientation as opposed to a traditional Jones-type WHIMS which uses a horizontal carousel. The vertical nature of the carousel allows for reverse flushing, i.e. magnetics flushing in the opposite direction of the feed, enabling strongly magnetic and or coarse particles to be removed without having to pass through the full depth of the matrix volume. In addition, the magnetics flushing is accomplished in a location (near the top of rotation) with low stray magnetic field to reduce any residual grip on the magnetic particles. These combined benefits lend to high availability due to minimized matrix plugging.

Pulsation and slurry bath

An actuated diaphragm provides pulsation in the separation zone to assist the separation performance by agitating the slurry and keeping particles in a loose state, minimizing entrapment. This mechanism also maximizes the particle accumulation (trapping) on all sides of the rod matrix creating more usable surface area for magnetics collection. A further benefit is to reduce particle momentum, which aids in particle capture by the applied magnetic force. This leads to improved find particle collection and separation.

Rod matrix

The SLon utilizes a filamentary matrix constructed of steel rods to accommodate various size ranges of feeds. The rods are oriented perpendicular to the applied magnetic field to enable optimum magnetic force to be achieved while minimizing the risk for entrapment of particles, when compared to grooved plates, randomly positioned filaments (wool) or expanded metal sheets.

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