Eccentrically arranged rotating magnetic field dry separator

Advantages and Features

• 1. Magnetic minerals will undergo rapid magnetic flipping and magnetic agitation in this dry magnetic separator, achieving efficient separation of magnetic minerals and non-(weak) magnetic minerals with a small mineral loss rate
• 2. This dry separator solves the eddy current heating problem generated by the conventional rotating magnetic field dry separator’s separation barrel and the difficulty in unloading the ore
• 3. The magnetic wrap angle is 360°, and the magnetic system all adopts NdFeB magnets with high magnetic energy product and high coercive force. The magnetic field intensity is high and the depth of action is large. The magnetic field strength demagnetization rate does not exceed 5% in 8 years
• 4. The magnetic system is covered with non-magnetic stainless steel to ensure that the magnet does not fall off
• 5. The sorting cylinder is covered with super wear-resistant rubber, which significantly increases the service life
• 6. When the grade of the dry-selected tailings of the magnetic drum or conventional dry separator is equivalent or even lower, for the rich magnetite of different properties, by adjusting the corresponding technical parameters and structure, it can be about 10% more tailings than the conventional magnetic drum or conventional dry separator, and the grade of the dry-selected concentrate can be increased by about 1.0% to 4.5% more than the conventional magnetic drum or conventional dry separator
• after fine crushing to 2 If the particle size is below mm and the embedded particle size is coarse, qualified concentrate with a grade of more than 60% can be directly obtained
• 7. When the grade of the dry tailings is equivalent to or even lower than that of the magnetic drum or conventional dry separator, for different properties of lean magnetite, by adjusting the corresponding technical parameters and structure, it can throw about 30% more tailings than the magnetic drum or conventional dry separator, and improve the grade of the dry concentrate by about 2.6% to 8.7% compared with the magnetic drum or conventional dry separator. The grade of the dry concentrate is significantly higher than the feed grade
• 8. Throw away a large amount of qualified dry-selected tailings, reduce loading, unloading, transportation and stacking costs, reduce grinding and beneficiation costs, reduce the beneficiation ratio and production costs, reduce the transportation volume of wet-selection tailings, and extend the service life of the tailings pond
• 9. In actual production, using this dry separator can remove about 10-30% more qualified dry-selected tailings than using conventional magnetic drums or conventional dry separators. Based on the fact that each unit can process 1 million tons of raw ore per year (unit hour capacity 150t/h, 1 million t/a), 10-30% more qualified dry tailings can be removed before grinding every year. About 10,000 tons of qualified dry-selected tailings can reduce the waste rock input into grinding by 100,000 to 300,000 tons
• based on the production cost of grinding, magnetic separation and wet tailings treatment of 30 yuan/ton, each dry separator can save about 3-9 million yuan in production costs per year. When the mining volume remains unchanged, the output of iron concentrate powder remains basically unchanged
• 10. Due to the reduction of the amount of waste rock entering the ball mill, the ball mill can increase its production capacity by about 100,000 to 300,000 tons per year (100,000 to 300,000 t/a), and accordingly the output of iron concentrate powder is also increased.

Working Principle

As shown in the picture on the left, Huston strong magnetic dry magnetic separator has no belt on the outer surface of the sorting cylinder, which can correspondingly increase the magnetic field intensity in the sorting area of ​​the sorting cylinder. The rotating magnetic system (magnetic envelope angle is 360 degrees) is installed inside the separation cylinder, and the fixed magnetic system (magnetic envelope angle is less than 90 degrees) is installed inside the unloading cylinder. The rotation direction of the separation cylinder is the same as that of the unloading cylinder, and the rotation direction of the separation cylinder is opposite to the rotation direction of the rotating magnetic system. When the feeder transports the ore to the sorting area of ​​the sorting cylinder, the magnetic minerals quickly and alternately pass through the N pole and S pole of the magnetic field many times in a short period of time. The magnetic minerals will undergo rapid magnetic flipping and magnetic agitation. The non-(weak) magnetic minerals mixed between the magnetic minerals have no magnetic adsorption or have very small magnetic force. Under the combined action of centrifugal force, gravity and the magnetic flipping and magnetic agitation of the magnetic minerals, they will gradually move toward the outer layer and be thrown out. In the sorting area of the sorting cylinder of the strong magnetic dry magnetic separator, the centrifugal force and gravity of the magnetic minerals mixed between the non-magnetic minerals are much smaller than the magnetic force. The magnetic minerals will gradually move toward the inner layer under the combined effects of strong magnetic adsorption, magnetic flipping, and magnetic stirring. When the magnetic minerals rotate together with the sorting cylinder, When arriving at the unloading area, since the rotating magnetic system is eccentrically arranged, the magnetic field intensity in the unloading area of the sorting cylinder is very weak, and most of the magnetic minerals can fall off automatically. When the small amount of magnetic minerals that have not fallen off rotates near the unloading cylinder, they are adsorbed to the outer surface of the unloading cylinder with a higher magnetic field intensity, thereby realizing automatic unloading of magnetic minerals.

Technical Specifications

Case Study

In the magnetite beneficiation plant, because the beneficiation indicators in the separation stage did not meet the standards, Huston’s eccentrically arranged rotating magnetic dry separator magnetic separation equipment was added as the second stage magnetic separation. This strong magnetic dry magnetic separator has high magnetic field intensity, large depth of action, and good magnetic separation effect; the cylinder contains wear-resistant rubber and has a long service life. While reaching standards and production, the ore grade is improved and the cost of frequent equipment replacement is reduced.