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As magnetic separators progress toward larger capacity, higher efficiency, and lower operating costs, some subeconomic iron ores have been utilized in recent years. For example, magnetite iron ore containing only about 4% Fe (beach sands or ancient beach sands) to 15% Fe (iron ore formations) and oxidized iron ore of only about 10% Fe (previously mine waste) to 20% Fe (oxidized iron ore formations) are reported to be utilized. They are first crushed and the coarse particles pretreated using roll magnetic separators. The magnetic product of roll magnetic separators may reach 25–40% Fe and then is fed to mineral processing plants
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As shown in Figure 5, slurry is fed from the top of an inclined screen in a low-intensity magnetic field, with the mesh size of screen sufficiently larger than those of particles in slurry. As the slurry flows down the above surface of screen, magnetic particles agglomerate with the size of agglomerations increasingly growing and roll down as magnetic concentrate at the lower end of screen. The less- or nonmagnetic particles pass through the screen as tailings. Figure 5 shows the operation of screen magnetic separators for cleaning of magnetite
Commercial magnetic separators are continuous-process machines, and separation is carried out on a moving stream of particles passing into and through the magnetic field. Close control of the speed of passage of the particles through the field is essential, which typically rules out free fall as a means of feeding. Belts or drums are very often used to transport the feed through the field
As discussed in Section 13.4.1, flocculation of magnetic particles is a concern in magnetic separators, especially with dry separators processing fine material. If the ore can be fed through the field in a monolayer, this effect is much less serious, but, of course, the capacity of the machine is drastically reduced. Flocculation is often minimized by passing the material through consecutive magnetic fields, which are usually arranged with successive reversals of the polarity. This causes the particles to turn through 180°, each reversal tending to free the entrained gangue particles. The main disadvantage of this method is that flux tends to leak from pole to pole, reducing the effective field intensity
Provision for collection of the magnetic and nonmagnetic fractions must be incorporated into the design of the separator. Rather than allow the magnetics to contact the pole-pieces, which then requires their detachment, most separators are designed so that the magnetics are attracted to the pole-pieces, but come into contact with some form of conveying device, which carries them out of the influence of the field, into a bin or a belt. Nonmagnetic disposal presents no problems; free fall from a conveyor into a bin is often used. Middlings are readily produced by using a more intense field after the removal of the highly magnetic fraction
Conventional magnetic separators are largely confined to the separation or filtration of relatively large particles of strongly magnetic materials. They employ a single surface for separation or collection of magnetic particles. A variety of transport mechanisms are employed to carry the feed past the magnet and separate the magnetic products. The active separation volume for each of these separators is approximately the product of the area of the magnetised surface and the extent of the magnetic field. In order for the separators to have practical throughputs, the magnetic field must extend several centimetres. Such an extent implies a relatively low magnetic field gradient and weak magnetic forces
The feed is transported by the primary air stream into the classifying chamber. The secondary air stream enters the classifier to a ring of guide vanes. The materials of construction are selected for highest strength during production
By altering the classifying wheel speed,the particle size can be easily adjusted even during operation. 2.Provide installation guide,commissioning and technical training,assure production operation on schedule and design requirement. 2.Provide installation guide,commissioning and technical training,assure production operation on schedule and design requirement
Due to the different density of particles, the centrifugal force, the centripetal buoyancy and drag force is different. So most coarse particles (or heavy phase) are discharged from cyclone underflow outlet, and the fine particles (or light phase) from the overflow tube, so as to achieve separation. Working modes of hydrocyclone includes classification, condensation, dehydration, desliming, sand removing sand, washing, ultrafine classification etc
hydrocyclone filter hydrocyclone separator classifying cyclone powder separation Why should you choose Yufeng Brand Hydraulic Cyclone9 1 . Yufeng brand hydraulic cycone has simple construction and no locomotor part, so requires less floor space and consumes less power. 2. Yufeng brand hydraulic cyclone is more efficient than other classifiers, especially in the finer size ranges
Material would go from the bottom of air classifier up to the classifying chamber by the air flow from suction fan. The classifying wheel with high-speed rotation would creat a strong centrifugal force to separate coarse powder and fine powder. Several units of classifiers can be connected in series to produce several different sizes
It is mainly used in ore dressing industry for classifying, dewatering and desliming. Processing Line Working Principle In closed circuit grinding system, it features high classification efficiency and fine over fall fineness under high mine concentration. Choose proper specification and mode of cyclone according to grinding processing capacity, over fall fineness and sedimentation concentration
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