First, use
The main sorting size range 0-0.25mm magnetic iron ore, to improve product quality and throughput.
Second use effect
1. It can ensure that the original output is unchanged, and the grade is increased by two percentage points.
2. It can ensure the yield is 15%-25% if the original grade is unchanged or slightly increased.
Three structures and working principle
1. Structure: mainly consists of the mining department, cylinder, internal magnetic system, external magnetic system, water supply device, and ore adjustment device.
2. Working principle:
A weak magnetic field with a relatively uniform magnetic field intensity distribution is arranged in the magnetic concentrator, and the magnetic particles are subjected to the action of the applied weak magnetic field to obtain further magnetization, especially the high-grade fine-grained magnetite particles will be coarsely granulated. The adsorption and flocculation of iron ore particles will become loose or even disintegrate when they reach the zero magnetic field and receive the mineral shear force when flowing with the slurry. When they enter another small magnetic field, they will become tight or Form new agglomerated particles or flocs.
The principle of the selection of the device is developed by utilizing the magnetic difference between the magnetic ore particles and the particles of the poorly-contained biomass (ie, the difference in specific magnetic coefficient), which is different from the conventional magnetic separator (field strength 120-140KA/m). Simple attraction separation, because this separation selectivity is low, and the sorting accuracy is poor.
When the slurry is fed into the interior of the separator, the magnetically strong magnetite particles are in the aqueous medium environment, and the weak magnetic field magnet particles are in the aqueous medium environment, and under the weak magnetic field (20-40KA/m), the light is slightly The magnetization forms a magnetic polymer with high selectivity and certain physical properties, while the gangue and the lean body have a low specific magnetic coefficient, are not easily magnetized in a weak magnetic field, and cannot form a polymer dispersed. This translates into a difference in settling velocity between the high-grade aggregates and the dispersion. During the sedimentation process, the high-grade condensate exhibits repeated agglomeration and dispersion due to the multi-layer magnetic field of the selector. Under the shearing action of the rotating and rising water flow, the dispersed machinery is mixed with the gangue and the lean body of the condensate. When it is out, the magnetic flocs continue to settle. When it settles to the high concentration, large specific gravity heavy medium and slurry layer composed of high-grade magnetite particles at the bottom of the sorter, another phenomenon is divided into gravity by specific gravity. selected, again flocs mechanical inclusions in a small proportion of low-grade particles get separated, so that the dressing was fully featured.
Equipment Specifications | 900 | 1100 | 1300 | 1500 | 1800 |
Water consumption (t/h) | 15-20 | 20-25 | 25-35 | 25-40 | 30-50 |
Water supply pressure Pa | 98-147 | 98-147 | 98-147 | 98-147 | 98-147 |
Processing scale (10,000 t / Y) | 5-7.5 | 5-10 | 10-15 | 20-30 | 30-45 |
Magnetic field strength (KA/M) | 20-40 | 20-40 | 20-40 | 20-40 | 20-40 |
Feed concentration (% by weight) | 35-40 | 35-40 | 35-40 | 35-40 | 35-40 |
Underflow concentration (K%) | 50-60 | 50-60 | 50-60 | 50-60 | 50-60 |
Overflow concentration (%) | 15-30 | 15-30 | 15-30 | 15-30 | 15-30 |
The difference between the liquid level of the center barrel and the overflow surface (mm) | 250-340 | 250-340 | 250-340 | 250-340 | 250-340 |
Sorting bed distance from flow surface height (mm) | 150-200 | 150-200 | 150-200 | 150-200 | 150-200 |
Sixth, technical characteristics
The beneficiation process with this equipment as the core is characterized by the removal of the lean continuous organism into the re-grinding of the middle mine, and effectively improve the quality of the concentrate. If the grade of the concentrate is kept constant, the final concentrate size can be coarsened, and the grinding grain size is coarsened to achieve a magnetic coarse grain tailing, reducing unnecessary pulverization of the gangue and a part of the magnetic separation iron ore monomer particles. The ability to reach the mill table is significantly increased.
Seven, transportation and installation
1. It is strictly forbidden to damage the external magnetic system and the barrel during transportation.
2. The level of overflow weir must be ensured during installation so that the overflow overflows evenly.
3, the carriage with its ring have a non-magnetic metallic wire (e.g., copper, aluminum, stainless steel, etc.) tied firmly to prevent displacement.
4. During the installation process, it is strictly forbidden to use electric welding at the magnetic system and magnetic system.
Eight, operating procedures
This equipment is a sorter with stricter operation requirements; it must be operated according to the operating procedures, otherwise it will not achieve its desired effect.
1. Before the mine is delivered, the machine must be filled with water, and the small discharge valve should be properly closed to reach normal (clockwise rotation of the hand wheel discharge opening, counterclockwise rotation OFF)
2. Adjusting and observing the difference between the liquid level and the escape surface in the central cylinder (or overflow condition) is the key to achieving the effect of magnetic separation.
1. When the liquid level in the central cylinder is low, it indicates that the inner bed of the sorter is very low or the internal pulp concentration is low. At this time, the small discharge port should be properly closed; when the internal concentration is increased, when the liquid level in the central cylinder slowly increases, Indicates that the internal concentration is increasing; to the low range.
2. When the liquid level difference between the liquid level and the overflow surface of the central cylinder is larger than the required range and continues to rise, the internal concentration is already high and the bed is already high. At this time, if the large discharge port is opened slowly, the overflow or the runaway will be blocked.
3. Maintain the height of the slurry bed in the cylinder. The bed is required to be 150-200mm from the overflow surface. When the bed is high, it is easy to turn over and run black. When the bed is low, the selection effect is poor (the black bed layer can be checked by the optional method).
4. Control the overflow flow, and the overflow grade should be 15-30%.
5. Control the underflow discharge concentration, the requirement is stable at 55-60%, the emission concentration is small, and the concentration of the bed or cone area (heavy medium) can not be formed in the separator. When the emission concentration is too high, it will cause a serious imbalance in the ore supply, and the bed will rise and run black.
6. Check the water supply pressure and flow rate frequently. The water supply is small, the water flow rises at a low speed, the shear force is small, and the gangue and the joint are not clean. The water supply is large, the water flow rises at a high speed, and the fine-grained high-grade flocs easily enter the overflow loss or circulation.
7. Regularly check whether the ore supply is stable. When the ore is not stable, the water should be properly added.
The critical flow rate of the magnetic agglomeration is the ascending water flow rate and the cone heavy medium concentration, so it is very important to ensure the water volume and low flow concentration.
Nine, operating precautions
1. It is strictly forbidden to fall into the body to prevent the blockage of the discharge port.
2. When adjusting the bottom valve, it should be adjusted slowly. Remember to adjust it greatly and quickly to prevent black running or pipeline blockage.
3. The lead screw should be lubricated frequently to make the handwheel flexible.
4. Always check the wear of the rubber cone plug.
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