High Gradient Magnetic Separator

Our High gradient magnetic separators utilize the combined forces field of magnetism, pulsating fluid and gravity to continuously beneficiate fine weakly magnetic minerals. They possess the advantages of high efficiency, low operative cost and high reliability. Till now there are about 600 high gradient magnetic separators widely applied in processing oxidized iron ores, ilmenite, manganese ore and many other minerals.

Structure and Working Principle:
Our High gradient magnetic separators mainly consist of the pulsating mechanism, energizing coils, magnetic yoke, separating ring, feeding and product boxes as shown in Fig. 1. Expanded metals or round bars made of magnetic stainless steel are used as matrix. While a direct electric current flows through the energizing coils, a magnetic field is build up in the separating zone. The ring with magnetic matrix rotates around its horizontal axis. When slurry from the feeding boxes enters into matrix located in the separating zone, magnetic particles are attracted from the slurry onto the surface of the matrix, brought to the top of the ring where the magnetic field is negligible, then flushed out into the concentrate box. Non-magnetic particles pass through the matrix and enter into the tailings box under the combined actions of gravity and pulsating hydrodynamic force.

As the ring rotates vertically, the flushing direction of the mags is opposite to that of feeding so that coarse particles can be flushed out without having to pass through the entire depth of the matrix pile. The pulsating mechanism drives the slurry in the separating zone up and down, keeping particles in the matrix pile in a loose state, therefore magnetic particles can be more easily captured by the matrix and non-magnetic particles can be more easily dragged to the tailings box through the matrix pile. Obviously, opposite flushing and pulsating prevent matrix from being clogged, and most importantly, pulsating helps to purify magnetic product.
Application and advantages:
High gradient magnetic separators beneficiating low-grade iron ore possesses the advantage of low cost and big capacity. They can be applied in the roughing stage to discharge most tails and slimes, upgrading the rough iron concentrate to a higher level, to make good condition for reverse-flotation.

(1) High gradient magnetic-reverse flotation flowsheet is simple and can get good iron concentrate grade and recovery. But usually the iron grinding size is fine and grinding energy consumption is more than other flowsheet.
(2) High gradient magnetic-gravity-reverse flotation flowsheet possesses the advantages of that coarse liberated iron ore can be recovered by spirals and part coarse tails can be discharged by High gradient magnetic separators (0.2~0.6T) at the primary stage. only part of fines enters the High gradient magnetic separators (1.0T)-reverse flotation stage. This flowsheet can get good iron concentrate grade and recovery with low cost, but the flowsheet is more complex than others.
3) Pure High gradient magnetic separation flowsheet to treat oxidized iron ores possess the advantages of simple, low cost, good iron recovery. But iron concentrate grade is usually not high enough.
(4) High gradient magnetic-gravity flowsheet to treat oxidized iron ores are simple and low cost. But iron recovery is usually not high enough.
(5) Many Chinese iron ore deposits are of low grade. High gradient Vertical ring pulsating high gradient magnetic separators have become the most advanced high intensity magnetic separator in such iron ore processing industry in China, promoting the oxidized iron ore processing technology developing fast.