wet drum magnetic separator | sepor, inc
Wet drum separators are used in magnetic media recovery, purification of solids carried in liquid suspension and in iron ore concentration. Heavy media plants require a wet drum magnetic separator that meets the following criteria:
1. Magnetic separators which recover magnetics contained in feed slurries as efficiently as possible, to reduce the per ton/media consumption of treated product to a minimum.
2. Recovery of magnetic solids in as clean a magnetic concentration as possible, to keep the separating bath at a low viscosity and eliminate misplaced product.
3. A high gravity magnetic discharge to eliminate, in many cases, the need for a densifier. A high gravity concentrate simplifies the plant operation.
4. Trouble free operation with minimum down time, minimum operator attention and minimum maintenance cost.
Con-Current Single Drum Wet Magnetic Separator. This is probably the most commonly used type of wet drum magnetic separator used in heavy media plants today. Tank arrangement is illustrated above. It gives the maximum cleaning of magnetic solids, recirculation of material passing through the wash spray back to the feed, and the highest magnetic solids discharge of the types discussed herein.
Counter-Current Single Drum Wet Magnetic Separator. This configuration is illustrated above. The advantages of this type of separator are maximum magnetic recovery, can tolerate heavy mag- netic loads, is less susceptible to loss of magnetic efficiency at high feed volumes (up to 80 GPM/Ft.), and the magnetic discharge is on the feed side of the separator.
1. Volume of rinse slurry to be handled.
2. Percent of solids in rinse slurry.
3. Percent of magnetics in the feed solids of the rinse slurry.
4. Required magnetic recovery efficiency.
5. Cleanliness required in the magnetic concentrate product.
One of the features of our magnetic separators is its ability to handle widely fluctuating loads. Therefore applications can be fount lying outside the service limits indicated. However, the limits outlined below are basic guide lines which will assure efficient magnetic separator performance. These guide lines will indicate changes that can be made in existing plants to improve media recovery efficiency. Each factor is considered separately, but all factors must be considered jointly for each particular application.
Feed volume should not exceed 75 GPM/Ft. of magnet width on a 30 inch diameter single drum separator. If feed volumes up to 90 GPM/Ft. must be handled, a double drum separator (rougher, scavenger model), in which the primary drum tailings and overflow product are sent to the secondary drum, should be applied. Efficient magnetic recovery cannot be expected at rates beyond 90 GPM/Ft..
The ratio of magnetic to non-magnetic solids cannot be effectively insulated from total percent solids in evaluating magnetic recovery. As a general rule, the limiting recommended feed solids in a media circuit is 50 percent. Variations of the ratio of magnetic to non-magnetic solids within this solids range can produce many potential feed slurries. The recommended maximum percent solids for a single drum separator is 15% for con-current separators, 20% solids maximum can be tolerated without losing magnetic efficiency. Beyond 20% solids, double drum separators (rougher, scavenger) are recommended.
In cases where the feed slurry goes above 30% solids, which sometimes occurs when a cyclone is being used to thicken a dilute rinse slurry product, sufficient water should be added in the feed box of the primary separator to bring the solids concentration down to 30% solids. For the discharge rate of a 36 diameter separator, add 20% to the above volume.
The ratio of magnetic to non-magnetic solids will influence the purity of the concentrate obtained. The non-magnetic content tends to deter effective magnetic cleaning when the non-magnetic to magnet ratio exceeds 40% by weight. If the feed pulp is sufficiently dilute (below 20% solids), purity of magnetic concentrate will not be seriously affected at the 40% concentration. When the total solids exceed 20% and when the non-magnetic solids exceeds 40%, it is difficult to obtain a high purity concentrate. This lopsided condition usually occurs in plants using reclaimed water and is alleviated by pulp dilution; or by running the media through the magnetic separator while the plant is not running, thus further rejecting non-magnetics.
A primary limitation in magnetic separator selection influenced by percent solids and percent magnetics in the solids, is the magnetic discharge loading on the magnetic separator. Single drum 30 inch diameter concurrent separators should be limited to 3 TPH of magnetic discharge per foot of magnet width. These magnetic recovery discharge limits are suggested in line with good magnetic recovery efficiencies. Counter-current separators can retain magnetic recovery at a sacrifice in magnetic cleaning at a discharge rate 30 percent higher than the above figures.
A double drum magnetic separator will permit the magnetic discharge to increase to as much as 30% above the indicated single drum rate. Optimum magnetic cleaning and recovery can be obtained with a double drum separator with con-current primary drum separator and with counter-current secondary drum separator.
Sepor, Inc. began business in 1953 with the introduction of the Sepor Microsplitter , a Jones-type Riffle splitter, developed by geologist Oreste Ernie Alessio for his own use in the lab. Sepor grew over the next several decades to offer a complete line of mineral analysis tools, as well as pilot plant equipment for scaled operations.
wet drum magnetic separator for separating fine-grained particles in slurries steinert
Our STEINERT wet drum magnetic separators are used in the fine grain range from 1 m up to 3000 m (0.001 mm 3 mm) to separate magnetic particles from process liquids, sludges or emulsions. Their strong magnetic fields enable the efficient separation of magnetite or ferrosilicon from the wet medium. Either a combination of the STEINERT HGF matrix separator and STEINERT NTS wet drum magnetic separator or with extreme throughputs the large STEINERT WDS drum separator can be used depending on the grain size, the levels of ferromagnetic particles and the required throughput.
The applications range from processing heavy solutions from flotation or sink/float separation, iron ore beneficiation through to the cleaning of process water from degreasing baths or coolants. The processing objective here can be both the recovery of valuable iron particles and the avoidance of disruptive iron particles, e.g. upstream of membrane or ultra-filtration.
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.
magnetic separator, magnetic drum separator, wet magnet separator
Magnetic separator is for particle size below 3mm magnetite, pyrrhotite, roasted ore, ilmenite and other materials wet magnetic separation, also for coal, non-metallic minerals, building materials and other materials de-ironing. Magnetic separator magnetic system, using high quality rare earth magnets or ferrite material composite, average magnetic flux density of tube surface is 100 ~ 600mT. According to user needs, we can provide a variety of downstream, semi- reflux and reflux products with different magnetic flux density surface. This product has characteristics of simple structure, large capacity, easy to operate and easy to maintain.
Performance Features of Magnetic Separator:
1. For depleted iron ore roughing after coarse/medium crushing, can exclude waste rock to improve ore quality and reduce load for next process.
2. For hematite in a closed reduction roasting operation, select out raw ore that is not fully restored, return it and then burn again.
3. For the ceramic industry, remove mixed iron from porcelain mud to improve the quality of ceramic products.
4. For burning coal, foundry sand, refractory and other industries requires iron removal.
Work Principle of Magnetic Separator:
The ore slurry flows into the tank via feed chute, under the effect of the water flow from ore-feeding water pipe, mineral particles in loose state goes into the feeding area of tank. Under the action of the magnetic field, the magnetic mineral particles gather together to form a "magnetic group" or "flux", in the pulp "magnetic group" or "flux" goes to magnetic pole by the magnetic force, and is adsorbed on the cylinder.
Because the magnetic poles are alternately arranged along the direction of cylinder rotation, and are fixed while working, when the "magnetic group" or "flux" rotates with cylinder, the magnetic stirring phenomenon generated due to magnetic poles alternating, gangue minerals and other non-magnetic mineral existing in the "magnetic group" or "flux" fall down while rolling, eventually the "magnetic group" or "flux" being sucked in the cylinder surface is the concentrate.
The concentrate rotates with cylinder to the magnetic system edge that has the weakest magnetic force, discharged into concentrate tank under the action of flushing water from ore-discharging water pipe. If it is full-magnetic roller, ore discharging is carried out by brush roll. Non-magnetic or weakly magnetic minerals are left with the pulp discharged outside the tank, which are tailings.
wet drum magnetic separators - saideep
The wet drum magnetic separator is ideally used to separate ferrous particles from non ferrous particles. They are so made by us to provide ultimate protection to crushers, Grinders, Pulverizers and allied equipment and is useful for mining and ore dressing industry. It is so made that one side is magnetized and the other side is not.
Only one side of the magnetic drum is magnetized and the other side is not magnetized. The stainless steel 304 shell which surrounds the magnet rotates freely and the magnet is stagnant. The ferrous particles that get attracted to the magnet are collected separately.
It is ideally used in Ceramic, Chemical, Glass, Fertilizer and food industry separates iron particles from granules and powder. The magnetic drums are suitable for capacities up to 2tons per hour can be given on short deliveries. They have a varying dimension of 300mm. To 600mm. The diameter and length varies up to 1500mm and has a capacity to handle 10 tonnes.
The magnetic drum separator consists of a number of oriented, isotopic permanent magnets that are assembled to give alternate polarity across the circumference dependent on the application. The magnetic intensity of the electro magnets is not all that more than permanent magnets. As rectifier and electricity is not used to operate this machinery hence they operate at low costs and also during power failures.
It conveniently removes the ferrous particles from the non ferrous powder and crystals and is ideal for Food, Fertilizer, Plastic, Pharmaceutical, Chemical and continuous process plants. It gives maximum protection to crushers, Grinders, Pulverizers, and allied equipment. It also proves to be helpful in mining and ore dressing industry and eliminates fire hazards and explosions in such plants where explosive materials are dealt. It saves time, labor, money since it reduces the chances of breakdown and has improves quality. These machines have a capacity to pay back in very short span of time.
Established in 1970, Saideep has carved a niche for itself in the engineering industry by delivering unmatched world class products. We are well focused on manufacturing, supply and export of industrial magnetic equipment and vibration equipment.
eriez - wet drum separators
Eriez Drum Separators are setting industry standards. The newest advances in magnetic circuitry design, plus over a quarter of a century of experience with solid/liquid separation, are combined in Eriez Wet Magnetic Drum Separators.
Innovations in both magnetic circuit design and materials of construction are applied to Eriez wet drum magnetic separators. This results in maximum magnetite recovery while operating with a minimum amount of wear and maintenance. Refinements in the magnetic circuit, tank design, and drive system have resulted in further improvements in metallurgical performance and operation.
Wet drums in heavy media applications provide continuous recovery of magnetite or ferrosilicon. Eriez has set the industry standards in the heavy media industry developing both the design criteria of the magnetic circuit and the benchmark of operation. The 750 gauss Interpole magnetic element, developed by Eriez, is the most acclaimed magnet of engineering standards in the industry. Eriez has also set the benchmark for wet drum performance. The culmination of various inplant tests has demonstrated that the separators will achieve magnetite recoveries in the 99.9+ percent. (This is based on magnetite losses of less than 1 gram/gallon of nonmagnetic effluent).
Two basic tank styles are offered. The drum rotates in the same direction as the slurry flow in the concurrent tank style. The slurry enters the feedbox and is channeled underneath the submerged drum. The slurry then flows into the magnetic field generated by the drum. The magnetite is attracted by the magnetic field, collected on the drum surface, and rotated out of the slurry flow. This tank style results in a very clean magnetic product.
The counterrotation tank style is preferred for heavy media applications. The drum rotates against the slurry flow in the counterrotation tank style. The slurry enters the feedbox and flows directly into the magnetic field generated by the drum. The magnetite is attracted by the magnetic field, collected on the drum surface, and rotated out of the slurry flow. Any magnetite that is not immediately collected will pass through to a magnetic scavenging zone. The short path that the magnetic material must be conveyed between the feed entry point and the magnetics discharge lip, combined with the magnetic scavenging zone, results in high magnetite recoveries.
Wet drum magnetic separators are the most vital part of the upgrading process in magnetite concentration. The upgrading of primary magnetite is always accomplished with wet drum separators. Mill feed is typically upgraded to 65+ percent magnetic iron using a series of wet drum magnetic separators. The number of magnetic separation stages required to upgrade the ore is dependent on the magnetite content and the liberation characteristics of the ore.
The Eriez Wet Drum Magnetic Separators is engineered and fabricated to provide reliable operation in demanding applications. The separator is designed for the continuous treatment of coarse milled ore providing a high level of availability. The tank and drum are fabricated from heavy gauge stainless steel with wear plate in impact areas. Wear areas are protected with hot vulcanized rubber. The drum utilizes heavyduty spherical roller bearings with a B10 life of 100,000+ hours. The drive system utilizes a Mill and Chemical Duty motor coupled to a shaft mounted gear reducer complete with Taconite Seals.
The feed enters the separator at the bottom of the tank and the drum rotates in the same direction as the slurry flow. This tank also has a scavenging zone. The nonmagnetics must migrate through the magnetic field to a full width overflow. This design, with the full width overflow, allows the tank to be selfleveling. There are no tailings spigots that must be adjusted to match the flow of the separator feed. This design is most effective for producing a clean magnetite concentrate. The magnetic element should incorporate several agitating magnetic poles to provide a high degree of cleaning. Since the finisher feed consists of fairly well liberated magnetite, extreme magnetic field strengths are not required for collection.
china wet drum magnetic separator manufacturers
Counter rotation wet drum separator for the automatic and continuous concentration of both ferrous and weakly magnetic ores. Can process material between 0-3mm in size.
Quality magnets provide for a stable and long lasting performance.
The shaft is well protected from the magnet system to allow it to run safely.
The sludge discharge points on both sides of the tank allow
for easy and a mess free cleaning environment.
The development of the automatic magnetic separator was caused by a breakthrough based on research of dewatering tanks, magnetic flocculations, magnetic columns, wash mills and the like. This innovation allows for a large capacity unit capable of greatly increasing the concentrate grade automatically in a reliable environment while also saving on water and power.
1) A large Increase in The Concentrate Grade
A positive and negative pulsation of the magnetic field allows for the particle to be loosely suspended in a slurry for a thorough discharge of the gangue and intergrowth. This enables the separator to both effectively improve the grade of the magnetic concentrate and control the magnetic material from draining into the tailings.
2) High Degree of Automation
The water and slurry volume, overflow density, discharge density and magnetic intensity is all automatically adjusted based on the specific properties of the minerals. This virtually guarantees the best separation possible throughout the process, even when the material's properties change through normal fluctuations of ore grade.
3) Simplify Process Flow
The magnetic flotation separator can replace the traditional finisher magnetic separator. By doing so it not only less the amount of equipment needed to complete the process, but, also reduces both water and power consumption.
4) Stable Separation
By means of having a larger separation area the amount of fluctuations in the end product that caused by the unstable feed rate are greatly reduced. When the change of material is within 60% of the normal feed, the end user can expect a stable and consistent product.
5) Power & Water-Saving
Positive and negative pulsations of the magnetic field, automatic feed control over the water and slurry levels as well as the magnetic intensity all allow for the maximization of resource use.
6) Remotely Control
Using a PLC module the unit can easily be monitored and adjusted, if ever desired, from the end user computer system in the central control room.
7) Adaptable Capacity
Based on the customer's needs, there are models ranging from the LJC-2000 to LJC-10000. This allows the end user to select a device capacity of processing for their needs, up to 80 tons per hour per unit.
This series features a shorter pickup area and is for the high capacity separation of material sized between 0-12 mm. It is generally best suited for the rougher separation of coarse material such as ocean, lake or river sand.
The magnets are well protected from any peeling or damage that may normally occur.
The concurrent tank design creates a unit that can not just handle a large capacity, but, operate in a virtually jam free environment.
The sludge discharge points on both sides of the tank allow for easy and a mess free cleaning environment.
HMDS series wet drum separators are primarily applied in coal washery plant for heavy media recovery.The latest magnetic material and advanced circuit design assures excellent separation performance.
Rare earth magnet assembly produces higher magnetic force.
Double-layer stainless steel drum shells make it easy for replacement.
Durable aluminum end cap and stainless steel flange.
Double-row self-aligning ball bearing makes it easy for replacement without disassembly of drum.
Modular structure makes it easy for installation and magneti angle adjustment.
SEW motor and SKF bearing assures stable running.
Recovery rate 99.9%
This series features a large pickup area and the Multi-pole with small gap magnet layout. By handing a small material size of between 0-3mm. It is generally used for a cleaner or at the finisher sizes.
Quality magnets provide for a stable and long lasting performance.
The shaft is well protected from the magnet system to allow it to run safely.
The sludge discharge points on both sides of the tank allow for easy and a mess free cleaning environment.