Magnetic separation is a process used to separate materials from those that are less or nonmagnetic. All materials have a response when placed in a magnetic field, although with most, the effect is too slight to be detected. The few materials that are strongly affected (magnetised) by magnetic fields are known as Ferromagnetics, those lesser (though noticeably) affected are known as Paramagnetics.
Ferromagnetics require relatively weak magnetic fields to be attracted and devices to separate these materials usually have magnets that are permanently magnetised (Permanent magnets do not require electricity to maintain their magnetic fields). Paramagnetics require stronger magnetic fields and these can only be achieved and maintained by electro magnets (large wire coils around an iron frame current is continuously passed through the coils creating the magnetic field within the iron. The field is concentrated across an air gap in the circuit).
Both ferromagnetic (low intensity) and paramagnetic (high intensity) separation devices (Laboratory Magnetic Separator) may be operated with dry solids or with solids in pulp form. (A complete classification of magnetic separating devices is given in Wills Mineral Processing Technology, pp. 338-356).
(*The units given are kilogauss (kG). These are the units most commonly used. The equivalent S.I. unit is the Tesla (T) * 1 Tesla = 10 kilogauss). The extremes of field strength used are based on experience from a magnetic separation testing laboratory over many years.
Magnetic separator is commonly used magnetic separation equipment in the mining industry. In order to extending the life of the magnetic separator and improve its working efficiency, how to use the magnetic separator in the correct way when it is in the specific operation process?
2. Attentions during the working: please pay attention to check the tightness of the transmission belt, and also pay attention to the presence of iron ore or debris in the box. What Special attention is the temperature rise of the magnetic separator bearing? If the bearing temperature rises too high, it should be stopped immediately to avoid more serious impact.
3. Precautions when the machine was shut down: the sand in the feeding hopper should be less than 1/2, and the boom should be slowly raised until the underwater quadrangular wheel is exposed on the water. There is no sand in the hopper, the feeding motor is stopped, the magnetic separator is stopped, and then the water selection system is stopped.
4. Maintenance: In addition to the use of magnetic separators, attention should be pay attention to the daily maintenance. Firstly, it is necessary to regularly check whether the wearing parts are worn seriously and whether the lubricating parts need to be added or replaced with lubricating oil. It will be better to extend the service life of the magnetic separation equipment. Secondly, the magnetic separator must be keep clean in regularly to ensure that there are no foreign objects and debris that affect the normal operation of the magnetic separator.
Magnetic separation is a process of using a magnetic force (magnetic roller in Fig.1) to extract magnetic components (magnetic particles) from a mixture (powdered ore). The result is magnetic material, strongly affected by magnetic fields (called as superparamagnetic) is separated from non-magnetic or less-magnetic material.
In magnetic separation, superparamagnetics require relatively weak magnetic fields to be attracted. Devices to separate these materials usually use magnets that are permanently magnetized. They do not require electricity to maintain their magnetic fields.
As shown in the process in Figure.1, when the powdered ore moves on the conveyor belt, magnetic separation uses a magnetic roller to attract magnetic particles, which move farther and fall into the collector on the right side until the magnetic force diminishes while non-magnetic particles fall off the belt into the collector on the left side.
Magnetic separation is also broadly employed in biology labs for sample preparation, e.g. cfDNA extraction, DNA cleanup, DNA sizing, Chromatin immunoprecipitation(ChIP) , and cell separation as well. It uses magnetic nanoparticles (also called as nanobeads, or beads) to bind the targeted sample. Magnetic beads enabled methods dont need column or centrifugation. They use magnetic force to aggregate, wash and elute magnetic beads-bound targets. This makes the workflow simple and easy for automation, which leads to higher throughput.
A magnetic separation rack is a tool for magnetic beads enabled sample preparation to provide the magnetic force to pull and aggregate the targeted sample and a tube-holding rack for batch processing.
What makes a good tool? Performance, durability and cost, i.e. effective, rapid, consistent and inexpensive. In the workflow above, a good magnetic separation rack should be able to pull the targeted sample rapidly and aggregate the sample in a spot thats easy to perform the aspiration, e.g. close to the tip of the tubes. NVIGENs magnetic separation rack has all these in one, which was originally designed in our lab for our own needs. Its made of strongest rare earth permanent magnets which provides strongest magnetic force consistently. The magnet is located under the slanted surface snug to the end of the tubes.
Figure 3. NVIGENs in-house magnetic separation rack with 1.5ml tubes and partial zoom-in. The tubes are snug fit to the slanted surface and the sample is aggregated in a tiny spot, leaving room for aspiration.