CT Magnetic Separator

CT Magnetic Separator

Magnetite Processing – Wet drum magnetic separators Magnetic-Separatorsare used extensively in magnetite processing to recover and upgrade magnetite.Dense Media Separation – Wet drum magnetic separators are used extensively in dense media separation to recover mineral used as a flotation medium i.e. magnetite & ferro silicon.Wet drum magnetic separators fitted with rare earth magnetic elements are necessary for lesser magnetically susceptible minerals i.e. Martite containing a Manganese inclusion. Service online

Detailed introduction

Description

All Eriez Magnetic’s Wet Drum Magnetic Separators operate on the same basic principle of a drum rotating around shaft mounted, permanent magnetic elements encased in stainless steel canisters. The drum containing the magnetic elements is mounted in a stainless steel tank which receives the feed slurry. The slurry enters the magnetic field generated by the magnetic elements and the ferro-magnetics are attracted against the drum which rotates the ferro-magnetics out of the slurry stream and discharge as they leave the magnetic field.

In a wet drum separator, the magnetic force acting on a ferromagnetic particle is predominately opposed by hydrodynamic drag force. This feature, when properly applied, provides the vehicle of separation washing away the non-magnetic particles while the ferromagnetic particles are collected in the magnetic field. The hydrodynamic drag force is also responsible for any losses of ferromagnetics.

  • The variables affecting the collection of ferromagnetics in a wet drum magnetic separator are:
  • 1) Magnetic field strength. The magnetic field strength must be sufficient to effectively collect ferromagnetic minerals.
  • 2) Hydraulic capacity. Ferromagnetic recovery is directly related to the flow rate through the separator. As the flow rate increases, the slurry velocity and consequently the fluid drag force increases which tends to detach more magnetite particles from the opposing magnetic field.
  • 3) Percent solids. The percent solid in the feed directly affects the selectivity of the separation. As the percent solids increases, the slurry becomes more viscous minimizing the effects of the fluid drag to assist in the separation of the silica.
  • 4) Ferromagnetic content. Any given wet drum magnetic separator has the characteristic of removing a limited amount of ferromagnetics based on the diameter of the drum, peripheral speed, and the magnetic field strength. This is referred to as the “magnetic loading”. Exceeding the limits of this magnetic loading will result in increased magnetite losses.

Eriez Magnetics offer three styles of wet drum magnetic separators:

  • The counter-rotation wet drum tank styleEriez-LIMS-Diagram-CRSL is preferred for heavy media applications and rougher concentrating duties.
  • The drum rotates against the slurry flow in the counter rotation tank style. Feed enters the feed box and flows directly into the magnetic field generated by the drum.
  • The magnetite is attracted by the magnetic field, and thus the magnetic particles are held to the drum surface and pass through an opening between the drum shell and the “squeeze pan” where excess water is forced out.
  • The relatively long travel of magnetic material through the water while being agitated by the special magnet design gives a good washing action and produces a clean magnetic concentrate.
  • A counter-current or Steffenson styleEriez-LIMS-Diagram-CC tank is used in the cleaner/finisher stage to provide a high degree of selectivity in the separation.
  • The feed is introduced near the bottom of the drum and the magnetic particles are picked up by the drum and agitated by wash water jets. The tailings discharge through an overflow at the opposite end of the tank, which also acts as a pulp level control. The counter current design ensures a high recovery of magnetic material and a high quality concentrate.
  • Technical data

    Model Roller Size DxL (mm) Speed (r/min) Capacity (T/h) Overall Dimension LxWxd (mm) Power (kw) Weight (t)
    CT(S/N/B)-712 750x1200 35 10-15 2330x1770x1280 3 1.85
    CT(S/N/B)-718 750x1800 35 20-35 2930x1770x1280 3 2.43
    CT(S/N/B)-918 900x1800 28 25-40 3095x1769x1465 4 2.75
    CT(S/N/B)-924 900x2400 28 40-55 3695x1769x1465 4 3.65
    CT(S/N/B)-1018 1050x1800 22 45-60 3115x1999x1565 5.5 3.6
    CT(S/N/B)-1021 1050x2100 22 52-70 3415x1999x1565 5.5 4.2
    CT(S/N/B)-1024 1050x2400 22 60-80 3715x1999x1565 5.5 4.8
    CT(S/N/B)-1030 1050x3000 22 80-120 4315x1999x1565 7.5 6.26
    CT(S/N/B)-1218 1200x1800 19 60-75 3150x2300x1920 7.5 5.85
    CT(S/N/B)-1224 1200x2400 19 80-110 3750x2300x1920 7.5 6.97
    CT(S/N/B)-1230 1200x3000 19 100-140 4350x2300x1920 7.5 8.5
    CT(S/N/B)-1545 1500x4500 14 160-220 6050x2700x2300 15 15
    Note: The magnetic strength should be determined in accordance with the nature of the ore. CT series wet magnetic separator can be customer-made.

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