Magnetic Separation


Magnetic separation (MS) is a traditional technology for beneficiation, tramp iron removal and non-ferrous metal recovery. Minerals industry, recycling, environmental engineering, food industry, biomedical and chemical industries are only some samples from huge list of MS applications. MS is the most simple, convenient and effective way of handling ferromagnetic and electrically conductive materials of any type and size.
In the past years new high energy permanent magnets, high temperature superconductive systems, new magnetic materials (such as for example magnetic liquids) and new magnetic circuits design methods lead to significant improvements of MS efficiency and possibilities.

 

Electromagnetic Separating Devices (ESD)

Immediately after invention of the first electromagnet in 1825, several separating electromagnets were patented and since that time ESD are on the market. For generating high magnetic fields on comparatively high distance from MS device we still do not have alternatives.

Main advantages of ESD are: simplicity, comparatively low costs, rigid constructions and comparatively deep magnetic field penetration into materials to be separated.

ESD disadvantages are: high level of heat generation and high energy costs.

Last years high temperature electromagnetic superconductive separating devices (ESSD) have been investigated, allowing significant reduction of energy consumption together with highest magnetic field generation possibilities.

DVM together with several partners and within performing of several International Investigation Projects has created, produced and supplied the following advanced ESD:

  • Series of U-dipole iron core ESD for wet highest intensity separation technology;
  • Series of iron clad ESD for high gradient cyclic separation technology;
  • Special ESD based on: recalculated magnetic circuits from steel with high magnetic permeability; compact band coils from new alloys with highest current conductivity; new compounds with highest heat conductivity;
  • Experimental superconductive system (ESSD) for highest gradient beneficiation of kaolin;
  • ESD with special properties for biomedical, chemical and some other specific applications.

 

Permanent Magnetic Separating Devices (PSD)

In the beginning of 50-th first magnetic separating devices with permanent magnets (PSD) appeared on the market.

Main advantage of PSD is  independence of external energy supply. Even if we do need external energy source for moving magnets within separation system, PSD is using only magnetic flux generated by permanent magnets.

Disadvantages of PSD are connected with different properties and costs of permanent magnets they are using. Some permanent magnets are not able to withstand high temperatures or humidity, other permanent magnets do not have enough mechanical strength or chemical stability, high energy permanent magnets are as a rule extremely expensive…

At the end of 90-th DVM has established a production of special high energy permanent magnets. The aim was creating initial alloys and production technology of high energy rare-earth magnets with special properties for magnetic equipment created and produced by DVM.

Last years DVM together with several partners and within performing of several International Investigation Projects has created, produced and supplied the following advanced PSD, using special high energy magnets from our production:

  • Series of high energy magnetic wheels (pulleys) with full or half magnetic area for dry high efficiency separation;
  • Dry Power and Wet Power Series of high efficiency drum separators, including single, double and triple roller systems with world highest capacities;
  • Super Power automatic magnetic wheel systems with working field up to 2,5 T;
  • Wet Power series of special Tray Separators with tray diameter up to 3m and material recovery level up to 40%;
  • Unique High Gradient Super Efficiency separators with the ring diameter up to 4m and separation capacity up to 250 ton per hour;
  • PSD with special properties: for biomedical, chemical, scientific and some other specific applications.

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