The dressing process of iron ore beneficiation equipment has a strict requirement on iron ore monomer separation, and iron ore grinding must take the minimum insetting grain size as a reference. When iron ores appear over grinding, with the self bonding force of ore particles far greater than their own inertia force, it is unfavorable for the subsequent iron ore separation flow and often leads to the grade of iron concentrate lowering down.
The ore grinding machinery lacks diversity. On the ore dressing market, there are only a few types of grinding equipment, and generally are autogenous mill, ball mill, rod mill, etc.
The ore crushing system has a strict limit on the entering of iron stuff, however, for some non-ferrous metals, it is difficult to achieve a satisfied effect to remove them, in addition to that the magnetic metals are difficult to be separated from magnetic minerals, which reduces the grinding efficiency to a certain extent. So how to improve the grinding efficiency without the occurrence of over grinding is the focus of future research.
In the grinding operations, the range of feeding granularity is to wide. Nowadays the grinding systems of ore dressing plants generally adopt the two-stage process, because the grinding operation consumes more energy. And many preparation plants try to reduce the grinding section and take the principle of more crushing and less grinding, for the sake of controlling the production cost, which is the shortcoming of grinding system as well. Since the feeding particle sizes are different, so it is easy to cause a part of minerals over ground.
In iron ore beneficiation flow, only by constantly discovering problems existing in the dressing process and eradicating them from the root, can it be possible to make the beneficiation efficiency growing up.
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