High Gradient Magnetic Separator

What is High Gradient Magnetic Separator?

The High Gradient Magnetic Separator (HGMS) is a new type of strong magnetic separator developed on the basis of general strong magnetic separator, whose magnetic system is usually made of high-quality ferrite material or composite with rare earth magnets, it is a piece of advanced equipment designed for the efficient separation of weak magnetic materials from fine or slurry feeds.

It is based on the magnetic field force to separate the magnetic material from the material. The equipment mainly consists of magnetic field system, transmission system and control system. The magnetic field system includes magnets, coils and magnetic field media, which are used to generate the magnetic field; the conveyor system includes conveyor belts and traction motors, which are used to pass the materials through the magnetic field area; and the control system is used to control the operation of the equipment and to adjust the magnetic field strength.

What Is High Gradient Magnetic Separator Used For?

High gradient magnetic separator is suitable for wet sorting and magnetic separation of fine-grained weakly magnetic minerals around -200 mesh, and it can also be used for magnetic separation of non-metallic ores to remove iron and purification operations. Such as:
◇ Ferrous metals: recovery of pseudohematite, hematite, limonite, rhodochrosite, manganese ore, and so on.
◇ Non-ferrous metals: separation of wolframite, garnet and other minerals.
◇ Rare metals: recovery of tantalum-niobium iron ore, iron-lithium mica, monazite, yttrium phosphorite and other ores, etc.
◇ Non-metals: purification and removal of quartz, feldspar, kaolin, and refractory materials.

High Gradient Magnetic Separator ordered by Customer

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Technical Parameters of High Gradient Magnetic Separator

Model	SSS-I-1000	SSS-I-1200	SSS-I-1500	SSS-I-1750	SSS-I-2000
Sorting Ring Diameter (mm)	1000	1200	1500	1750	2000
Rated Excitation Power (KW)	25	35	45	63	72
Processing Capacity (T/H)	4~10	10~20	20~35	30~50	40~75
Rated Background Field Strength (T)	1.0	1.0	1.0	1.0	1.0
Feeding Particle Size (mm)	0.01~2	0.01~2	0.01~2	0.01~2	0.01~2
Supporting Motor Power (KW)	4.5	6.6	8.4	13.5	16.5
Machine Weight (Kg)	8000	12000	21000	38000	51000

Working Principle of High Gradient Magnetic Separator

In the work of high gradient magnetic separator, after the ore slurry flows into the tank body through the feed box, the ore particles are in a loose state and enter the feed zone of the tank body under the action of the water flow from the feed spray pipe. Under the action of the magnetic field, the magnetic ore particles undergo magnetic aggregation and form “magnetic clusters” or “magnetic chains”. “Magnetic clusters” or ‘magnetic chains’ in the slurry by the magnetic force, to the magnetic pole of the movement, is interspersed in which the vein stones and other non-magnetic minerals in the flopping off. Ultimately sucked in the cylinder surface of the “magnetic mass” or “magnetic chain” is the concentrate, concentrate with the cylinder to the edge of the magnetic system of the weakest magnetic force, in the unloading water pipe under the action of the flushing water flow is unloaded into the concentrate tank, non-magnetic or weakly magnetic minerals are left in the slurry along with the slurry The non-magnetic or weakly magnetic minerals are left in the slurry and discharged with the slurry to become tailings.

Advantageous features of High Gradient Magnetic Separator

• Wide range of application: due to the unique magnetic system structure and optimized combination of magnetic media, the upper limit of the feed size of the high gradient magnetic separator reaches 2.0 mm, which simplifies the on-site grading operation and has wider adaptability.
• High gradient magnetic field: Setting up the slurry high frequency vibration mechanism, driving the slurry to generate pulsating fluid force, so that the ore particles in the slurry are always in a loose state, which can improve the quality of magnetic concentrate.
• Good adaptability to the nature of the material: it has strong adaptability to the fluctuation of the feeding particle size, concentration and grade, and is able to deal with ores and slurries of different natures.
• High production efficiency: the use of wrapped open magnetic system, the material is not wrapped, no blocking phenomenon, while the use of magnetic field strength and gradient of the minerals in one stage of separation, separation of minerals process is more simple, improve the processing capacity and mineral recovery rate.
• Overall superior performance: the equipment runs smoothly, works reliably, and has strong adaptability to the fluctuation of the feeding degree, concentration and grade of the materials.

High Gradient Magnetic Separator FAQ

Q: What magnetic field intensity can a high gradient magnetic separator achieve? How fine of iron particles can it remove?
A: Our equipment can achieve a background magnetic field intensity of up to 2.0 Tesla (T) , with pulse peaks reaching 2.5T. It can effectively remove weakly magnetic impurities as fine as 1 micron (μm) (such as iron oxide, mica, ilmenite, etc.). It is highly effective for purifying high-purity quartz sand, feldspar, and kaolin.

Q: What is the difference between a high gradient magnetic separator and a magnetic drum separator?
A: The core difference is magnetic field gradient and processing particle size. A magnetic drum has a low gradient and can only capture +100 mesh strongly magnetic minerals (like magnetite). A high gradient magnetic separator uses magnetically conductive matrix to create extremely high gradients, capturing micron-sized weakly magnetic particles (like hematite, mica, iron oxide scale) – with 10-50 times higher precision.

Q: Is the high gradient magnetic separator prone to clogging? How to solve it?
A: Clogging mainly occurs in the matrix box. We solve this with a high-frequency vibration flushing + backwashing system: ① The magnetic matrix uses diamond or expanded metal mesh design to reduce dead zones for accumulation; ② Automatic high-pressure water flushing activates after de-magnetizing; ③ An ultrasonic cleaning device is available as an option. With normal maintenance, it can run continuously for 200-300 hours without clogging.

Q: My material is iron ore slime with 80% passing -200 mesh. Can I recover it with a high gradient magnetic separator?
A: Yes, very suitable. High gradient magnetic separators are specifically designed for fine (-200 mesh) weakly magnetic minerals. For recovering tailings from hematite, limonite, or siderite, the iron concentrate grade can increase by 15-25% , with recovery rates of 70-85% . We recommend sending a 1-2kg sample to us for a free beneficiation test.

Q: How many tons per hour can a high gradient magnetic separator process?
A: Single-unit capacity depends on material characteristics and field configuration. Common models process 5-80 tons per hour. For example: iron removal from -60 mesh quartz sand: 30-50 tons/hour; high-viscosity kaolin: approximately 5-10 tons/hour. We can design multi-stage series or parallel configurations according to your capacity requirements.