Summary.The rod mill is the same as the ball mill in the construction and available to both of wet and dry processing.Unlike the ball mill, however, the rod mill .
In fine grinding, when the product size is < 0.5mm, the grinding effect of the ball mill is greater than that of the rod mill(the feeding particle size of ball mill is generally 5-25 mm).
Impact sand gravel making machine instructionvsi impact crusher is new type sand making the machine, has better comprehensive performance than the rod mill sand making machine, the straight-through impact sand making machine, and the cone crusher and soft hammer crusher.It has the characteristics of stable and reliable work, convenient maintenance and high sand production rate.The equipment is suitable for stone shaping, production mechanism sand, sand making field, high-grade highway, railway, water conservancy, construction, cement, refractory, metallurgy, glass sand, and other industries.Structurevsi sand making machine features1.Special light oil lubrication system ensures the temperature to be within 25 c.2.Brand new automatic protection device provides the machine with vibrating, oil filtering and warning system.3.A new type oil filtering device ensures the bearings and other transmission devices not being abraded and prolong their service time.4.Optimized design of wearable materials has prolonged the service time of the machine by 40%, so the cost is lowered by more than 40%.5.Better design of the impellers reduces the resistance of materials; high lightens passing through quantity of materials and crushing ratio, so the efficiency is raised by 30%-60% compared to traditional machines.6.The hydraulic system allows automatic uncovering, which reduces labor intense and makes maintenance easier.7.The mainframe adopts new techniques, which strengthens the machine structure and tenacity, and ensures stable performance.The quality of the machines is to lift to a higher level.Technical parametersmodelfeed at center&sidesfeed at centersoft materialhard materialrev (r/min)power (kw)motor modelmachine size (mm)capacity(t/h)max.Feeding(mm)vsi7611120-18060-9035301700-18904-552y250m-4/55410022502258vsi8518200-260100-13040351520-16904-902y280m-4/90414022802425vsi9526300-380150-19045401360-15104-1322y315m-4/132456024502780vsi1140450-520225-26050451180-13104-2002y315l2-4/200456024502780.
Ball loading capacity the volume of the grinding medium is the percentage of the effective volume of the mill, which is called the filling rate of the grinding medium.The size of filling directly affects the number of shocks, the area of grinding and the load of grinding medium in the grinding process.At the same time, it also affects the height of the grinding medium itself, the impact on the material and the power consumption.A kind of the ball loading capacity of the mill can be calculated according to the formula (1-14).Gra quantity of grinding medium, t.Rho s loose density of grinding medium, t/m3.Forged steel balls; p=s=4.5-4.8t/m3 cast steel balls p=4.3-4.6t/m3; rolling steel balls p=6.0-6.8t/m3; steel segments p=4.3-4.6t/m3_-filling ratio of grinding medium, when wet grinding: lattice ball mill pi = 40% 45%; overflow ball mill phi = 40%; rod mill phi = 35%.Dry grinding: when material is mixed between grinding media, the grinding medium expands, and when dry grinding is adopted, the material fluidity is relatively poor, material flow is hindered by abrasive medium, so filling rate is low, and the filling rate is between 28% and 35%.The pipe mill is 25%-35%.The void fraction of grinding medium_k=0.38-0.42 and the quality of crushed material accounts for about 14% of the quality of grinding medium.
The batch ball and rod mills require a drive roll to rotate themat the proper grinding speed, the batch rod mill should be run between 47 rpms and 79 rpms.
Drum separators are the most common machines in current use for cleaning the medium in dms circuits and are widely used for concentrating finely ground iron ore.They consist essentially of a rotating non-magnetic drum (see attached figure 1 drum separator) containing three to six stationary magnets of alternating polarity, although the permos separator uses many small magnet blocks, whose direction of magnetisation changes in small steps.This is said to generate a very even magnetic field, requiting less magnetic material.Figure 1 drum separatoralthough initially drum separators employed electromagnets, permanent magnets are used in modern devices, utilising ceramic or rare earth magnetic alloys, which retain their intensity for an indefinite period.Separation is by the pick-up principle.Magnetic particles are lifted by the magnets and pinned to the drum and are conveyed out of the field, leaving the gangue in the tailings compartment.Water is introduced into the machine to provide a current which keeps the pulp in suspension.Field intensities of up to 0.7 t at the pole surfaces can be obtained in this type of separator.The drum separator shown in figure 1 is of the concurrent type, whereby the concentrate is carried forward by the drum and passes through a gap, where it is compressed and dewatered before leaving the separator.This design is most effective for producing an extremely clean magnetic concentrate from relatively coarse materials and is widely used in dense medium recovery systems.The separator shown in figure 2 is of the counter-rotation type, where the feed flows in the opposite direction to the rotation.This type is used in roughing operations, where occasional surges in feed must be handled, where magnetic material losses are to be held to a minimum, while an extremely clean concentrate is not required, and when high solids loading is encountered.Figure 2 counter-rotation drum separatorfigure 3 shows a counter-current separator, where the tailings are forced to travel in the opposite direction to the drum rotation and are discharged into the tailings chute.This type of separator is designed for finishing operations on relatively fine material, of particle size less than about 250 m.Drum separators are widely used to treat low grade taconite ores, which contain 40-50% fe, mainly as magnetite, but in some areas with hematite, finely disseminated in bands in hard siliceous rocks.Very fine grinding is necessary to free the iron minerals that produce a concentrate that requires pelletising before being fed to the blast furnaces.Figure 3 counter-current separatorin a typical flowsheet the ore is ground progressively finer, the primary grind usually being undertaken autogenously, or by rod milling, followed by magnetic separation in drum separators.The magnetic concentrate is reground and again treated in drum separators.This concentrate may be further reground, followed by a third stage of magnetic separation.The tailings from each stage of magnetic separation are either rejected or, in some cases, treated by spiral or cone concentrators to recover hematite.The cross-belt separator (see attached figure 4) and disc separators once widely used in the mineral sands industry, particularly for recovering ilmenite from heavy mineral concentrates, are now considered obsolete.They are being replaced with rare earth roll magnetic separators and rare earth drum magnetic separators.Figure 4 cross-belt separatorrare earth roll separators use alternate magnetic and non-magnetic laminations.Feed is carried onto the magnetic roll by means of a thin belt as shown in figure 4, hence there is no bouncing or scattering of particles as they enter the magnetic zone, and they all enter the magnetic zone with the same horizontal velocity.These factors contribute to achieving a sharp separation.Roll speed can be adjusted over a wide range, allowing the product quality to be dialled in.Dry rare earth drum separators provide a fan of separated particles which can often be seen as distinct streams (see attached figure 5).The fan can be separated into various grades of magnetic product and a nonmagnetic tailing.In some mineral sands applications, drum separators have been integrated with one or more rare earth rolls, arranged to treat the middlings particles from the drum as shown in figure 5.Figure 5 a laboratory dry rare earth drum separatorpictures of drum separatorspictures of drum separators produced by henan deya machinery co., ltd.Magnetic-separator_01magnetic-separator_11magnetic-separator_10magnetic-separator_09magnetic-separator_08magnetic-separator_07magnetic-separator_06magnetic-separator_05magnetic-separator_04magnetic-separator_03magnetic-separator_02.
1.Grinding media can contact with the ore in a line way in the grinding process.Therefore, rod mill can grind materials selectively;.
Bar and wire producers, as well as welding companies, rely on sheffields wire rod mill for uniquely specialized products in a wide range of grades.Sheffield wire rod mill uses smacc feedstock billets to produce wire rod in round, hexagon, and square shapes, as well as rebar coil.
Wire rod block mill is composed oftop crossed 45high-speedwire-rod mills/finishing mills.The finishing mill group/wire rod mill is located in high-speed wire-rod workshop.Through several unit rack the continuous micro-tension rolling mill will be transported upstream 17 ~21mm of rolling, rolling become 5.5 ~ 16mm finished wire.The working speed of 90m/s, 135m/s etc.
Rod mills, also named rod grinders, are available in dry and wet types.Customers can choose anything they like according to actual conditions.The company adopts the advanced controllable materials feeding in and discharging technology and installs appropriate grinding rod depending on the actual materials changing from the traditional surface contact to line contact, making more even particle size and higher yield.Therefore, they are widely used in refractory, chemical industry, metallurgy, glass and other industries, which are highly demanding of evenness degree for finished products.In recent years, they are also used in sand making industry for building materials.
3.Compatible with different grinding methods compared with the sand making machine, the rod grinding sand making machine has a unique advantage, that is the rod mill is compatible with dry grinding and wet type grinding method, the other sand making equipment can only be dry grinding.
The finesse of the material milled by the ball mill is 0.074mm-0.4mm, only except for the two small ball mills that have a wider range of 0.075-0.89mm.However, the rod mill fine grinding fineness is about 0.833-0.147mm.In terms of the fineness of the ground material, the ball mill has a finer handling ability.
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