Quartz Ore Magnetic Separator

Aug. 31, 2011 - PRLog -- When minerals are put in the magnetic field, you will find three reactions which may occur. First, they are attracted to the magnetic field. Second, they are repulsed by the magnetic field. And third, no noticeable a reaction to the magnetic field occurs.

Particles which are attracted to the magnetic field are classified as magnetic. But, there are two classifications of magnetic particles, strongly magnetic particles, including iron and magnetite, and weakly magnetic particles, including rutile, ilmenite, and chromite. Strong magnetic particles may be easily separated with a separator creating a low intensity magnetic field of 400 - 600 gauss. Paramagnetic particles (weakly magnetic) need a higher intensity magnetic field to separate them, generally including 6,000 to 20,000 gauss. http://www.smecrusher.com/mining-construction/mining/iron/iron-ore-crusher/  

Particles that are repulsed by a magnetic field are called diamagnetic. A distinct separators called Eddy Current Separators, uses the diamagnetic particles, separating them off their material. One of many largest uses currently is within the recycling industry, where wire and metals produced from copper and aluminum are separated from plastics. When product, including aluminum, passes on the eddy current , the spinning magnets within the shell generate an eddy current in the aluminum thus creating a magnetic field round the bit of aluminum. The polarity from the magnetic field from the aluminum is equivalent to the rotating magnets, resulting in the aluminum to be repelled out of the separator. Product including plastic, glass, or other process materials simply fall off the end with the separator. An eddy current is described as the currents due to voltages induced by changing flux, and tend to oppose the modification with the flux.

Non magnetic particles, such as gold, quartz, and pyrite, aren't amenable to magnetic separation, however some magnetic material may be removed from the feed. For example, using some situations, plants using gravity concentration for recovering gold, used magnetic separators to get rid of the high power of magnetite that was recovered using the gold, ahead of further processing.

http://www.smecrusher.com/solution/magnetic-separation/  can be quite a inexpensive approach to recovery, unless intense separators are essential. The electro-magnetic high intensity separators that produce 20,000 gauss, tend to be expensive. However, the rare earth magnetic separators are affordable and can produce magnetic fields around 6,000 gauss. So, while searching for a process to recuperate valuable minerals, magnetic separation really should not be overlooked, if a number of the material is magnetic or para-magnetic.

So that as a touch upon choosing magnetic separators, once i ran a project involving separating some magnetite, rutile from a spiral concentrator concentrate, a new engineer just out of school, came up if you ask me and asserted he had a method to affect the process and both eliminate a stage of separation, while saving cash. I asked him to explain this concept and the man began telling me that he would simply eliminate the first stage of low intensity separators and send everything straight to the high intensity magnetic separators. This would eliminate the dependence on one complete circuit, and would only "slightly" overload the high intensity separators. He further explained that by slightly enhancing the size of the high intensity magnetic separators, this challenge will be solved. Then he stood back, awaiting my approval.  http://www.smecrusher.com/solution/gravity-separation/  

"Well" I began, "you have definitely been giving this some thought. But you do not have access to two critical items of information, that could build your plan unacceptable. First, by sending highly magnetic material with a intense magnetic separator, it could rapidly fill the magnetic surface and blind off of the separator course for just about any weakly magnetic material, which means you would decrease the efficiency from the separator by 50% to 70% or maybe more. The magnetic separator salesman i would love you, though because he could retire after you purchased an adequate amount of the expensive intense magnetic separators to create your idea work. That literally brings me for the second point, low intensity drum separators cost a fraction of the items a high intensity magnetic separator would cost. These 20,000 gauss separators cost several hundred thousand dollars each, although this drum separator costs around $20,000, each. Almost one factor of 10. So, while it is a interesting concept, it would cost more to recover the titanium from your rutile than a single could ever sell it off for, which makes it not feasible. Try not to allow that to discourage you against considering alternate methods, because that's how discoveries are created."

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