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As one of the common mineral processing methods, magnetic separation method is widely applied in the separation of magnetite,manganese, ilmenite and other magnetic minerals. But do you know what two key factors affect the magnetic separation method? And how does each of them affect the magnetic separation method?
According to the working principle of the magnetic separation method, we can know that the magnetic separation method uses the magnetic differences among various minerals to realize mineral separation in the uneven magnetic field of various magnetic separator.
There are two key factors that affect the magnetic separation method: one is the magnetic difference among minerals, another is the magnetic field distribution of magnetic separator.
According to the magnetic differences, the minerals can be classified into strong magnetic minerals, weak magnetic minerals and non-magnetic minerals. It is because of the magnetism of the minerals that we can use the magnetic separation method to separate the different minerals. In other words, the magnetic differences among minerals are the basis of magnetic separation method.
For strong magnetic minerals, such as magnetite, pyrrhotite, magnetite hematite, etc., the specific susceptibility is more than 3.8×10-5m3/kg. The low-intensity magnetic separator (magnetic field intensity is 0.1-0.3T) is usually applied;
For weak magnetic minerals, such as chromite, ilmenite, manganese ore, etc., the specific susceptibility is between 7.5×10-6 to 1.26×10-7m3/kg. The strong intensity magnetic separator (magnetic field intensity is 1-2T) is usually applied.
There are many factors that affect the magnetic properties of minerals, and the magnetic properties of minerals indifferent regions and deposits are also different. Therefore, when adopting the magnetic separation method for the specific minerals in a certain region, we should judge the magnetic properties by the magnetic determination results of minerals, and then select the strong magnetic separation method or the weak magnetic separation method.
In order to enlarge the magnetic difference of minerals in the actual production, some magnetic separation plants usually change the magnetic properties of minerals with the help of some methods, such as magnetization roasting, alkali dipping magnetization, magnetization of magnetic species, etc., so as to change the magnetic properties of minerals and facilitate the magnetic separation method.
The magnetic field is a special state in the space around a magnet. The magnet placed in a magnetic field is subjected to the magnetic force. The magnetic field intensity, gradient and direction(that is, whether the magnetic field is evenly distributed) in the separation space of the magnetic separator often affect the effect of the magnetic separation method.
In the uniform magnetic field, the mineral particles are only affected by the steering force, the diversion of the mineral particle sizes is parallel to the field direction. In the heterogeneous magnetic field, the mineral particles are subject to the steering force and magnetic force.
The minerals rotate and move towards the increasing magnetic gradients, which forms the rollover phenomenon, so the magnetically different grains are separated.
In addition, different magnetic separator has a different design in the magnetic field distribution of separation space.
Magnetic separator can be divided into weak magnetic field separator (magnetic field intensity is 0.1t-0.2t), medium magnetic field separator (magnetic field intensity is 0.2t-0.5t) and strong magnetic field separator (magnetic field intensity is 0.5t-2.0t).
The common weak magnetic field separators mainly include magnetic drum, wet permanent magnetic separator, magnetic field screening separator, etc.
The common strong magnetic field separators include dry magnetic separator, continuous high gradient magnetic separator, electromagnetic pulsating high gradient magnetic separator, etc.Most of them have a more complex magnetic field design.
Magnetic separator can be divided into constant magnetic field separator, rotating magnetic field separator, alternating magnetic field separator and pulsating magnetic field separator.
In summary, it is not difficult to find that although the magnetic separation method is a kind of relatively simple mineral processing method, it is very necessary to understand the mineral properties,magnetic separation method and magnetic separator in advance.
It is suggested to entrust the mineral processing equipment suppliers with qualification of mineral processing test to seek technical support, and choose the scientific and reasonable magnetic separation method and equipment according to the recommended results of ore dressing test, so as to ensure the win-win situation of production indexes and economic benefit.