Three major indicators affecting the sorting of dry magnetic separators

Dry magnetic separator is applicable to wet magnetic separation of materials such as magnetite, pyrrhotite, roasted ore and ilmenite below 3mm in grain size. It is also used for iron removal of materials such as coal, nonmetal minerals and building materials. . Xindi Mining Machinery Factory is a professional manufacturer of dry magnetic separators. The magnetic field strength of the surface of the dry magnetic separator cylinder in our company is deep, the angle of the magnetic system is large, the magnetic field strength is stable, the transmission system is stable and reliable, and the ore can be significantly increased. Grinding taste. Well, today, we share with you the third-level indicators that affect the selection of dry magnetic separators.

(1) The thickness of the feed layer: It is related to the particle size and magnetic particle content of the raw materials to be processed, and the coarse feed layer is generally thicker than the fine particles. When processing coarse-grained ore, the thickness of the ore bed is about 1.5 times that of the largest particles. Treatment can be up to 4 times the size of the largest particles in the medium size, and up to 10 particles in the case of fine-grained materials. When the content of magnetic materials in raw materials is not high, the ore bed should be thinner. If it is too thick, the magnetic particles in the lowermost layer are subjected to the pressure of the upper layer material, and the magnetic force cannot absorb them and the recovery rate decreases. When the magnetic particle content is high, the ore bed can be thicker.

(2) Magnetic field strength and working gap: It has a close relationship with the particle size, magnetic level and operation requirements of the material being processed. When the working gap is fixed, the magnetic field strength between the magnetic poles is determined by the number of turns of the coil, and the number of turns cannot be adjusted. The magnetic field intensity can only be adjusted by changing the size of the excitation current. To handle magnetically-enhanced selections such as Red Honor, a weaker magnetic field should be used to handle less magnetically magnetic materials and sweeping operations, and the field strength should be higher. When the current is constant, changing the size of the working gap can not only change the strength of the magnetic field, but also change the magnetic field gradient and reduce the sharp increase in the gap magnetic field force. Generally, the size of the treated particles should be reduced as much as possible in order to increase the recovery rate. When selecting, it is better to increase the gap to increase the selectivity and improve the quality. At the same time, it is necessary to increase the excitation current to ensure the required magnetic field strength.

(3) Feeding speed: The feed speed is determined by the speed of the vibrating tank (or belt). Its speed determines the mechanical force of the time the ore pellet stays in the magnetic fear. The faster the speed, the shorter the ore pellet stays in the magnetic field. The mechanical force of the ore pellets is dominated by gravity and inertial knife, gravity is a Constant, inertial force is proportional to the square of velocity. Weak magnetic mineral particles receive more magnetic force than gravity in the magnetic field. Therefore, when the velocity exceeds a certain limit, the inertial force increases, and the magnetic force to be absorbed is insufficient, resulting in a decrease in the recovery rate. Therefore, when selecting weak magnetic minerals, it is advisable to use a feed rate lower than that of ferromagnetic minerals. Generally, in the selection, there are more monomer particles in the raw materials and the magnetic properties are stronger. The feed rate of the ore can be increased. When scanning, the raw material contains more contiguous bodies and the magnetic properties are weaker, so as to improve the recovery rate. The speed of the mine should be lower. When dealing with fine particles, in order to facilitate the looseness of the mineral particles, the frequency of the vibration trough should be high and the amplitude should be smaller; when processing coarse particles, the frequency should be opposite. Appropriate operating conditions should be determined experimentally based on the nature of the ore and the requirements for sorting quality. When dealing with rare metal ores, the raw materials should be kept dry at a narrow level to give ore, which is conducive to the improvement of the index. If a wide grade of ore is used, the magnetic force of particles of different sizes is greatly different, and at the same time, the choice of sorting conditions is also difficult. Experience has shown that the more grading levels of raw grains, the better the indicators. In a selected plant in China, the primary grain sieve is divided into two (3) to 0.83 (20 mesh) mm, 0.83 to 0.2 (65 mesh) mm and 0.2 to 0 mm three grades respectively, which is 10% higher than the ungraded index. The moisture in the raw material can make the ore particles stick to each other. The finer the particles, the more severe the degree of sticking, so the allowable moisture content of the raw materials at all levels is not the same. Generally -3mm of raw material allows moisture does not exceed 1%, finer particles. The stricter the requirements.

Gongyi Xindi Mining Machinery Factory is located in Zhengzhou, the provincial capital of Henan Province, and between the ancient capitals of the nine dynasties. Zhengluo Expressway, Zhengxi Adjustment Railway, Longhai Road and National Highway 310 cross east and west, and is connected with the new urban area of ​​Gongyi City. The widest Gongyi City can be seen. The brightest and greenest Welcome Avenue passes through the front door. Strategic location, convenient transportation. Our factory produces a variety of magnetic separation series, dry magnetic separator, wet magnetic separator, strong magnetic separator, permanent magnetic separator, complete product specifications, perfect detection means, novel design, reliable performance and convenient operation.