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magnetic separator wikipedia

wet magnetic drum separator

wet magnetic drum separator

Low-intensity separators are used to treat ferromagnetic materials and some highly paramagnetic minerals.Minerals with ferromagnetic properties have high susceptibility at low applied field strengths and can therefore be concentrated in low intensity (<~0.3T) magnetic separators. For low-intensity drum separators used in the iron ore industry, the standard field, for a separator with ferrite-based magnets, is 0.12 T at a distance of 50 mm from the drum surface. Work has also shown that such separators have maximum field strengths on the drum surface of less than 0.3 T. The principal ferromagnetic mineral concentrated in mineral processing is magnetite (Fe3O4). although hematite (Fe2O3) and siderite Fe2CO3 can be roasted to produce magnetite and hence give good separation in low-intensity machines.

Permanent magnetic drum separators combine the attributes of a high-strength permanent magnetic field and a self-cleaning feature. These separators are effective in treating process streams containing a high percentage of magnetics and can produce a clean magnetic or non-magnetic product. The magnetic drum separator consists of a stationary, shaft-mounted magnetic circuit completely enclosed by a rotating drum. The magnetic circuit is typically comprised of several magnetic poles that span an arc of 120 degrees. When material is introduced to the revolving drum shell (concurrent at the 12 oclock position), the non-magnetic material discharges in a natural trajectory. The magnetic material is attracted to the drum shell by the magnetic circuit and is rotated out of the non-magnetic particle stream. The magnetic material discharges from the drum shell when it is rotated out of the magnetic field.

Permanent magnetic drum separators have undergone significant technological advancements in recent years. The magnetic circuit may consist of one of several designs depending on the application. Circuit design variations include:

The standard magnetic drum configuration consists of series of axial poles configured with an alternating polarity. This type of drum is simple in design and can be effective for low-intensity applications such as the recovery of ferrous metals and magnetite. This configuration typically does not provide a sufficient field strength or gradient for the recovery of paramagnetic minerals at high capacities. A typical axial circuit is shown in Figure 3.

The high-gradient element, as the name implies, is designed to produce a very high field gradient and subsequently a high attractive force. Several identical agitating magnetic poles comprise the element. The poles are placed together minimizing the intervening air gap to produce the high surface gradient. Due to the high gradient, the attractive force is strongest closer to the drum making it most effective when utilized with a relatively low material burden depth on the drum surface and, thus, a lower unit capacity. A high-gradient magnetic circuit is shown in Figure 4.

The interpole-style element utilizes a true bucking magnetic pole or interpole between each main pole. The magnetic field of the bucking element is configured to oppose both of the adjacent main poles resulting in a greater projection of the magnetic field. As a result, the interpole circuit allows for a relatively high material burden depth on the drum surface and thus higher unit capacity or improved separation efficiency. An interpole magnetic circuit configuration is shown in Figure 5.

A second interpole configuration consists of steel pole pieces placed between the magnetic poles. This is commonly termed a salient-pole element. The steel interpoles concentrate the magnetic flux providing a very high magnetic gradient at the drum surface. The magnetic field configuration is similar to the high- gradient type element but with an intensified surface gradient. This configuration offers the strongest field projection of any of the previously described circuits. The salient-pole circuit design is shown in Figure 6.

The magnetic elements described above are axial elements. The magnetic poles run across the width of the drum and are of alternating polarity. Magnetic elements are typically assembled with a minimum of five magnetic poles that span an arc of 110 degrees. (For all practical purposes, an arc of only 80 degrees is required to impart a separation. Non-magnetic particles usually leave the drum surface with a natural trajectory at a point of 60 to 70 degrees from top dead center dependent on the drum speed, particle size, and specific gravity.) The poles have alternating polarity to provide agitation to the magnetic components as they are transferred out of the stream of the non-magnetics. A magnetic particle will tend to rotate 180 degrees as it moves across each pole. This agitation is functional in releasing physically entrapped non-magnetics from the bed of magnetics. Agitating magnetic drums are most effective in collecting fine particles or where the feed contains a high magnetics content.

Dense-medium circuits have been installed in many mineral treatment plants since its original development about thirty years ago. In the intervening period the process has been thoroughly evaluated and many innovations have been introduced. The Heavy Density Cyclone is one of the newer systems which has extended the operating range of this process to 65 mesh size.

Medium recovery is obviously important since any loss is a direct cost against production. In coarse coal dense-medium plants a loss of 1 pound of magnetite per ton is usually acceptable but reduction to pound per ton as has been obtained in some plants.

Efficient cleaning maintains fluidity in the bath and increases sharpness of the coal-waste separation. Most dense-medium systems will tolerate some non-magnetic dilution of the bath but the magnetic separator must be capable of keeping this within workable limits, particularly on difficult coals. In some plants a partial bleed of the operating dense-medium bath is maintained through the magnetic separator to keep it clean.

Operating gravities of dense-medium coal plants are usually low enough so that a straight magnetite bath can be used. The return of a magnetic separator concentrate having 50% or more solids will maintain gravity without need for a thickening device. The use of a drum wiper has permitted the return of a 70% solids concentrate back to the separatory vessel. Operation at a high solids concentrate discharge is recommended since medium cleaning is improved. The colloidal slimes carried over with water are more completely rejected at high solids discharge.

Several types of magnetic separators have been used in magnetic medium recovery.The first magnetic drum separators were electro magnetic types but the development of efficient wet permanent drum separators has resulted in nearly universal acceptance of permanent drums in new plants.

The basic construction of each drum is the same. It consists of a stationary magnet assembly held in a fixed operating position by clamp bearings mounted on the separator support frame. An outer rotating cylinder driven through a sprocket bolted to one of the drum heads carries the magnetic material to the magnetic discharge point.

Normally, extreme cleanliness of the magnetic concentrate is not of prime importance in dense-medium plants but this can be a factor in some coals that separate with difficulty. The concurrent tank, reduced separator loading and in some instances dilution of the feed pulp will improve magnetic cleaning. Recleaning of a primary concentrate would improve cleaning but has not been used in commercial plants.

in-line magnetic separators & cross belt magnetic separators - is there a difference? | imt

in-line magnetic separators & cross belt magnetic separators - is there a difference? | imt

When it comes to developing an understanding of the value of industrial strength magnets that are available for sawmills, mining companies, recycling facilities and food manufacturers (among others) it may be helpful to start with an explanation of some of the types of magnetic separators that are available to aid business processes.

Magnetic belt separators extract unwanted metal debris, also known as tramp metal, from industrial conveyor belt systems. The difference between in-line magnetic separators and cross belt magnetic separators (also known as overband) is clearer once you understand where the use of one configuration may be preferable to the other.

Through the implementation of a suspended magnet, cross belt magnetic separators (CBS) have a belt that continuously runs thereby cleaning the extracted tramp metal from the magnets surface. When CBS installations feature a permanent magnet, they will retain these unwanted metals even during a power failure. CBS technology can increase uptime and reduce maintenance costs and liability risks by providing a metal-free final product. These self-cleaning magnetic separator models are positioned perpendicular to the conveyed materials travel. This allows the tramp metal to be thrown out the side of the conveyor.

The In-line magnetic separator is very similar to the cross belt in that is also has a continually running belt across the magnets surface. The difference being this separator runs parallel with the conveyed material, discharging tramp meal at the end of the conveyor. Typical reasons for using this form of separator is fast running conveyors, deep burden depths and location practicality.

Still need help understanding what type of magnetic separator will best serve your companys business needs? We can help! With over 25 years of industry experience, IMT is a leading authority on industrial magnets in Canada. From the planning process of a new plant or facility to the re-imagination of an existing configuration, we offer project management services for industrial facilities to maximize production capacity and efficiency with industrial strength magnets and related equipment. Contact us via (250)491-5806 or via [email protected] today.

magnetic drum separators | goudsmit magnetics

magnetic drum separators | goudsmit magnetics

For automatic continuous removal of ferrous and even weakly magnetic contaminants. Magnetic drum separators - also called drum magnets - are very suitable for product flows that are heavily contaminated with magnetic particles.Our strongest drum magnets have a higher separation efficiency with small weakly-magnetic contaminants than any other type of magnetic separator.

Easy-to-install drum magnets for the continuous separation of coarse or sharp iron particles. Various magnet strengths (1800-3000-6000-9000 gauss) and types available to separate strong- or weakly- magnetic particles.

When it comes to bodywork, constructions, machines, tanks, wheel rims or bridges, these various products all have one thing in common, and that's a process they undergo during production or maintenance: abrasive grit blasting. Blasting is a surface treatme...

When it comes to bodywork, constructions, machines, tanks, wheel rims or bridges, these various products all have one thing in common, and that's a process they undergo during production or maintenance: abrasive grit blasting. Blasting is a surface treatme...

non-ferrous metal separators - eddy current separators

non-ferrous metal separators - eddy current separators

In todays times, non-ferrous metals recovery is extremely popular. Tonnes of non-ferrous metals such as aluminium, copper, lead, zinc and stainless steel are recovered and recycled for industrial usage. Recovery of aluminium is done for packaging while for new copper products. The recycling of copper is becoming more and more desirable and within Europe, 41% is being recycled from old taps, copper plumbing pipes, scrap from copper and electronic waste.

The Eddy Current Separator was invented in 1984 by Hubert Juillet, a French thermodynamician. Eddy Current Separators are advanced metal sorting units that has the capability of separating non-ferrous metals such as aluminum and copper from waste which helps to recycle metal in all its forms. Eddy Current Separators do not work on ferrous materials, which makes it ideal to isolate different types of metal from one another. At Jaykrishna Magnetics Pvt. Ltd., we are the leading manufacturers of Eddy current separators which are designed with the highest possible quality of magnet, crafted with reliability and efficiency in mind.

When a piece of non-ferrous metal, such as aluminum or copper, passes over the separator, the magnets inside the rotor rotate past the aluminum at high speed. This forms eddy currents in the aluminum which in turn create a magnetic field around the piece of aluminum. The polarity of that magnetic field is the same as the rotating magnet, causing the aluminum to be repelled away from the magnet. This repulsion makes the trajectory of the aluminum greater than that of the non-metallics, allowing the two material streams to be separated.

Eddy current separators work by removing all non-ferrous metals, while everything ferrous is not affected. Essentially, an Eddy current separator is a short conveyor belt that carries the waste and the magnet that will work as the separator. This magnet is located on a non-metallic drum that rotates at high speeds. The high speeds form an electrical current capable of separating non-ferrous metals from the process stream, ensuring the segregation of waste and metal.

We manufacture large range of magnetic separators since decades for various industrial application. Our Eddy Current separator which is also called non-ferrous metal separators is one of the most advanced magnetic separators in the market for recycling industries. If you have any query or inquiry email us your details on [email protected]

Jaykrishna Magnetics Pvt. Ltd. is the leading manufacturer and exporter of Magnetic and Vibratory Equipments in India. We are established since 1978. The unique and premium structural design imparts quality and elegance to our products. Our focus is on continuously improving our process, service and products to exceed the benchmarks set by our competitors and offer better products to you.

what is permanent magnetic drum separator | how does it work | m&c

what is permanent magnetic drum separator | how does it work | m&c

Table of Contents What is Permanent Magnetic Drum SeparatorHow Permanent Magnetic Drum Separator WorkTypes & Features of Permanent Magnetic Drum Separators1. Downstream Type2. Countercurrent Type3. Semi-Countercurrent Type

The permanent magnetic drum separator is suitable for the separation of fine-grained magnetic minerals in metallurgical mines and concentrators, or for the removal of mixed magnetic minerals in non-magnetic minerals.

The surface magnetic field intensity of the permanent magnetic drum separator is much higher than that of the ordinary permanent magnetic separator, which is easy to operate, manage and maintain. The processing capacity is usually 24T/H-240T/H.

After the pulp flows into the tank through the ore feed tank, under the action of the water spray pipe, the ore particles enter the ore area in a loose state. In the magnetic field, The magnetic ore particles are magnetically aggregated to form magnetic clusters or magnetic chains. The magnetic clusters or magnetic chains are magnetically moved in the slurry to move toward the magnetic poles and are adsorbed on the cylinder, and the non-magnetic minerals such as gangue adsorbed on the cylinder fall off during the overturning, and the magnetic clusters or magnetic chain adsorbed on the cylinder surface is the concentrate.

Under the action of pulp flow in the tank body, non-magnetic ore particles and weak magnetism ore particles flow into the tailing pipe from the tailing hole on the bottom plate. The pulp is fed continuously, and the concentrate and tailings are discharged continuously to form a continuous separation process.

The feeding direction of pulp is the same as that of the drum, the concentrate is discharged on the other side, and the tailings is discharged directly at the bottom, which is generally used for 6-0mm strong magnetic minerals.

Features: The downstream magnetic separator has a bigger processing capacity, which is suitable for the roughing and selection of coarse and strong magnetic materials, and can also work in series. When the amount of ore is large, the magnetic ore is easy to lose, so we should strengthen the operation management and control at a lower pulp level.

The feeding direction of ore slurry is opposite to that of the drum. The concentrate is discharged from the feeding side, and the tailings are discharged from the other side. It is generally used in 0.6-0mm strong magnetic minerals.

Features: The countercurrent magnetic separator is suitable for the coarse and sweep separation of fine and strong magnetic minerals. The recovery is high, but the concentrate grade is low. Because the coarse material is easy to deposit and block the separation space, the countercurrent magnetic separator is not suitable for coarse materials.

The feeding direction of half of the pulp is the same as that of the barrel, and the other half is the opposite. The difference with the downstream type is that the pulp rotates in a circle in the tank.

The slurry is washed loose by water to prevent inclusion, and the movement direction of pulp is consistent with the magnetic direction, which is conducive to the recovery of 0.5-0mm strong magnetic minerals.

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