The electromagnetic dry powder magnetic separator is widely used in the dry
purification of quartz sand, but many customers have reported that the iron
removal effect decreases and the iron content in the finished product exceeds
the standard after a period of operation. The problem usually focuses on three
aspects: magnetic field strength, feed uniformity, and equipment
temperature.
Insufficient or uneven magnetic field strength is the primary reason for poor
iron removal efficiency. Use a Gaussian meter to detect the magnetic field
strength in the sorting area. If it is much lower than the rated value of the
equipment (such as only 1200 Gauss measured at a rated value of 2000 Gauss), it
indicates that the electromagnetic coil may be aging or have a short circuit
between turns. After disconnecting the power supply, open the magnetic casing
and check for any blackening or burning marks on the coil. Use a multimeter to
measure the resistance value, and if the deviation from the standard value in
the manual exceeds 10%, replace the coil. Rust on the magnetic yoke can also
reduce its magnetic permeability. It can be treated with sandpaper to remove
rust and then coated with anti rust paint. If there is a "magnetic field blind
spot" in the selection area, it is necessary to contact the manufacturer to
adjust the arrangement of magnetic media or install auxiliary magnetic
poles.
Uneven feeding also affects sorting efficiency. When the feed is too fast,
the material accumulates in the sorting area, and magnetic impurities are
discharged with the finished product before they can be adsorbed; If the feeding
is too slow, the equipment processing capacity will be insufficient. Suggest
checking if the vibrating feeder or belt feeder is operating normally. The
moisture content of materials has a particularly significant impact on the dry
magnetic separation effect - when the moisture content exceeds 1%, fine powders
are prone to agglomerate and adhere to the surface of the magnetic medium, which
not only reduces the separation effect but also accelerates the blockage of the
magnetic medium. Before feeding, it is necessary to ensure that the material is
fully dried, and a fabric spreader should be installed in front of the magnetic
separator to control the thickness of the material layer within 5-8mm, ensuring
that the material is evenly distributed in the magnetic field zone.
Excessive temperature is another common hazard of electromagnetic dry powder
magnetic separators. Long term operation of electromagnetic coils can generate a
large amount of heat. When the temperature continues to exceed 60 ℃, it not only
affects the stability of the magnetic field, but may also burn out the coil.
Check whether the cooling fan and cooling air duct are blocked by dust, and
maintain good ventilation around the equipment. It is recommended to install a
temperature monitoring device that automatically reduces load or stops cooling
when the coil temperature approaches the warning value. If the equipment
operates in a high-temperature environment for a long time, it may be considered
to install a forced air cooling or water cooling system.
If you encounter specific problems during equipment operation, you can
contact the technical team of Shandong Heavy Industry: Manager Zhang at
13583776655 (same as WeChat).