Compared with the permanent magnet dry magnetic separator, the electromagnetic dry magnetic separator can achieve higher magnetic intensity, and can adjust the current to change the size of magnetic intensity to meet the requirements of different mineral separation. At present, the commonly used electromagnetic induction roller strong magnetic separator and electromagnetic disk strong magnetic separator.
Strong electromagnetic induction roller magnetic separator are composed of coil and magnetic yoke magnetic circuit set in two special shape of the magnetic head, placed in the middle of the two magnetic head can turn the induction of tooth slice of roller, the gaps between the magnetic head and induction roller is working clearance, the size of the work has very important influence on magnetic induction intensity, magnetic field intensity can reach 2.2 T. The magnetic separator is working, the material by vibrating feeder evenly into the work, weak magnetic particles and impression should be captured in magnetic roller rotation, when brought to the bottom of the weak magnetic field area, under the action of gravity fall into the trough, non-magnetic minerals along the direction of the parabola, magnetic mineral and the proportion of non-magnetic minerals can be adjusted by points ore board position.
Electromagnetic induction roller has a single roll, vertical double roll, parallel double roll and up and down four rollers and other forms of structure. When the induction roller is arranged up and down, the mineral can be divided into two successive sorting, horizontal arrangement, to improve the equipment processing capacity. The machine is mainly used for the removal of non-metallic minerals under 2mm, such as high-purity quartz sand, blue spar, rutile, zircon sand, diamond, etc., can also be applied to select Manganese ore, garnet, cobalt clay and other weak magnetic minerals.
In the production practice, the use of GCG dry electromagnetic induction Roller Type strong magnetic separator for high-purity quartz sand removal of iron purification operations, a single sorting can be Fe2O3 content from 0.0015% to 0.002% lower than 0.0004%, two times to obtain a Fe2O3 content of 0.0002% ultra-pure quartz sand For silicon wire stone in addition to iron, when the Fe2O3 content in the ore to 7.48%, the first sorting can reduce the Fe2O3 content to 1.85%, two times the separation can be reduced to 1.5%, in addition to the iron rate of more than 80%, at present, the machine has been widely used in the non-metallic mineral purification.
The main structure of the electromagnetic disc magnetic separator consists of a "mountain" type magnetic system, a rotating disk suspended above the magnetic system and a vibrating groove. The electromagnetic body is arranged under the conveyor belt, and the lower magnetic pole head plane is close to the lower surface of the conveyor belt; The rotating sorting plate is placed on the upper surface of the conveyor belt, and the distance between the plate and the belt can be adjusted up and down. The next week border area of the disk is made into a dentate groove to collect the strong magnetic field formed by magnetic lines, and the lower magnetic pole head corresponds to constitute a constituency. The air gap at the front edge of each disc is greater than that at the back edge, enabling each disc to separate two different magnetic properties. The position of the vertical regulating disk and the method of controlling the excitation current of each magnet can change the magnetic field intensity. The equipment has single plate, double plate and three plates, and is suitable for dry separation of weak magnetic materials with particle size less than 2mm, such as manganese ore, wolframite, coastal placer, tin ore, phosphate rock and so on.
Work by vibration slot, material to be delivered to the disk, the following work of weakly magnetic minerals by the role of inhomogeneous magnetic field was sucked into the disc of tooth, and with the disc to the vibration slot, due to the sharp decline in the magnetic field strength, weak magnetic minerals under the action of gravity and centrifugal force, fall into the slots on either side of the vibration magnetic products meet hopper; The non-magnetic mineral is discharged from the end of the vibration tank and enters the non-magnetic product receiving hopper. In order to prevent the blockage of strong magnetic materials, weak magnetic field equipment is required to remove the strong magnetic minerals before feeding. The advantage of this equipment is that it has high separation accuracy and can separate minerals with less difference than the magnetization coefficient.
In China to obtain a more widely used 576mm electromagnetic double disk strong magnetic separator, the machine work gap of 3mm when the magnetic field strength up to 1.7t,2mm 1.9T, processing capacity 500kg/h. Using the machine to the domestic manganese ore sorting, to the ore grade mn12.1%, in the magnetic field strength of 1.5T, can obtain mn32.4% manganese concentrate, the recovery rate of about 80%. When the zircon sand is selected, the concentration of ZrO2 in the ore is 62.5%, 65% of the concentrate can be obtained and the recovery rate can reach more than 98%.
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