Tianli Magnet Technology

Wet Drum Magnetic Separators(WLIMS)-CTS (N.B) series is a widely used magnetic separator for iron ore beneficiation.Lots of iron ore plant will installate a batch of WLIMS to concentrate the low grade iron ore.The WLIMS means Wet low intensity magnetic separator,as it just need the low intensity magneic force to concentrate the strong magnetic material-iron ore.

There are two distinct applications for wet drum magnetic separators:

1.The recovery of magnetite or ferrosilicon in a heavy media process,

2.The concentration and recovery of magnetite from iron ore.

Tianli has produced several thousand Low Intensity magnetic separators (LIMS) both dry and wet versions to the iron ore industry.

There are three different types of operation structures:                                                                                                        

Concurrent Design (CC)

The concurrent tank features:

• Feed box with serrated weir

• Intermediate distribution chamber

• Short threshold pick-up zone

• Drum revolving concurrently with pulp flow

• Adjustable outlet spigots on tank bottom for nonmagneticeffluent

• Selection of orifices for bottom spigots to controlpulp level in tank This particular tank design is mainly used for processing of material with particle sizes up to 6 - 8 mm (3 mesh). The pulp density should be maintained from 30 to 50 % solids by weight with best results normally obtained in the mid range.

Counter-current Design (CTC)

(Steffenson type) The counter-current tank features:

• Full width feed channel directs pulp to feed entry slot of tank

• Feed entry at lowest point of tank

• Medium length pick-up zone for highest magnetics recovery and grade

• Drum revolving counter-current to effluent pulp flow

• Full width effluent overflow weir for control of pulp level in tank capable of tolerating rather large fluctuations in flow

• Con-current flow of magnetic particles

• Jet water furnished in feed channel (optional)This tank design is suitable for (non-magnetic)particle sizes up to 0,8 mm (20 mesh) and is the most effective separator for cleaning and finishing.Optimum pulp density range is 25 to 35 %solids by weight.

Counter-rotation Design (CR)

The counter-rotation tank features:

• Full width feed chamber directs pulp to drum

• Feed entry near magnetic concentrate discharge

• Extra long pick-up zone for highest magnetics recovery

• Drum revolving counter-current to effluent pulp flow

• Full width effluent overflow weir for control pulp level in tank, hence tolerating rather large fluctuations in flow

• Level control by weir bars at tailings discharge

This tank design is particulary suitable for cobbing and roughing of fine to coarse particles up to 3-8 mm (4 mesh) at medium to high densities (30 to 50% solids).. It is excellent for capacity and recovery, but should not be used as a single unit when highest concentrate grade is required.

• Strongest, most effective magnetic elements in the industry

• Ceramic and Rare Earth magnetic elements to cover LIMS & MIMS applications

• Stainless steel encapsulated magnetic element

• One piece stainless steel drum shell

• Abrasion–resistant aluminum or stainless steel end flanges

• Double–row, self–aligning ball bearings easily accessible without drum disassembly

Operating Features of Wet Drum Magnetic Separators

The variables affecting the collection of ferromagnetics in a wet drum magnetic separator are:

Magnetic field strength. The magnetic field strength must be sufficient to effectively collect ferromagnetic minerals.

Hydraulic capacity. Ferromagnetic recovery is directly related to the flowrate through the separator. As the flowrate increases, the slurry velocity and consequently the fluid drag force increases which tends to detach more magnetite particles from the opposing magnetic field.

Percent solids. The percent solids of the feed directly affects the selectivity of the separation. As the percent solids increases, the slurry becomes more viscous minimizing the effects of the fluid drag to assist in the separation of the silica.

Ferromagnetic content. Any given wet drum magnetic separator has the characteristic of removing a limited amount of ferromagnetics based on the diameter of the drum, peripheral speed, and the magnetic field strength. This is referred to as the “magnetic loading”.Exceeding the limits of this magnetic loading will result in increased magnetite losses.

Magnetic separation theory

The magnetic separation of magnetite and other magnetic minerals is a complex process.During the separation process, each particle is subjected to a number of forces, including gravity,drag, etc.The simplified equation below describes the magnetic force the particles are subjected to:

Magnetic force:

Fmag d3*c*B*dB/dx

d = particle diameter

c = relative suspectibility

B = magnetising field

dB / dx = magnetic field gradient

The magnetic system produces a magnetic flux density mesaured in Tesla or Gauss and a magnetic field gradient (T/mm or G/mm). Generally,smaller pole pitches produce a lower flux density but a higher gradient. The smaller pole pitch normally has a higher magnetic attraction (expressed as B • dB / dx) close to the drum which decreases rapidly with the distance away from the drum. Hence, the smaller pole pitch(referred to as high gradient, HG) has a greater ability to pick up finer or less magnetic particles but has a lower throughput capacity when compared to a magnetic assembly with a larger pole pitch.

Magnetic drum assembly 

The heart of the magnetic separator is the magnetic drum assembly which is composed of a stationary magnetic array mounted inside of a non-magnetic drum. During operation, the drum revolves around the magnetic assembly thereby transporting magnetically attracted material on the drum to the area designated for discharge.The drum heads are normally cast from nonmagnetic aluminium alloy and the drum shell is manufactured from non-magnetic stainless steel. Drum shells are normally rubber or stainless steel covered against abrasion.

Magnetic systems

The magnetic system has alternating polarity and is comprised of six main poles and intermediate cross poles for maximising the magnetic flux. Other systems for special applications are also avalable.

You may also interested in below magnetic equipment or magnetic machine: 

1. Magnetic separator/magnetic separators;  

    A: dry magnetic separator,wet magnetic separator,

    B: low intensity magnetic separator,mid intensity magnetic separator,high intensity magnetic separator

    C: high gradient magnetic separator,slon high gradient magnetic separator,

    D: neodymium magnetic separator.

2. Overband manget/overband magnets,Magnetic Drums,Magnetic Pulleys;Magnetic Rollers

    A: permanent suspended magent,permanet suspension magnet,permanent overband magnet,permanent cross belt magent.

    B: electro magnet,electromagnetic separator,electro overband magent,electro crossblet magent.

    C: permanent magentic drum,

    D: permanent magnetic pulley

    E: permanent  magnetic rollers

3. Eddy current separators;

    A: concentric eddy current separators

    B: eccentric eddy current separators

4. Magnetic solutions EPC.

Right now,Tianli have developed more than thirty series of Tianli brand magnetic separators,Deferrization magnets,and mining equipments,etc.which include hundreds of products with different specifications.Tianli is good reputaion magnet supplier,magnetic separator supplier in china.If you are looking for the quality magnetic separator vendor,magnetic separator distributor,magnetic separatorfactory,or magnetic separator company. Tianli is your good choice.

Looking for magnetic separator products or magnetic separator manufacturer or magnetic separator factory ?Tianli is the best choice in china,provide the good service and the good quality for you.