Magnetic separation equipment mainly has weak magnetic field magnetic separation equipment, strong magnetic field magnetic separation equipment and high gradient magnetic separation equipment. The weak magnetic field magnetic separation equipment is suitable for processing various strong magnetic minerals, including sorting equipment (such as wet barrel magnetic separator, dewatering tank, magnetic gathering machine, dry cylinder magnetic separator, magnetic roller, etc.) and auxiliary equipment ( Such as pre-magnetic, demagnetizer, etc.).
1. Wet cylinder magnetic separator
The magnetic system of the wet-type magnetic separator has electromagnetic and permanent magnets. Due to the successful application of permanent magnet materials, the permanent magnetic cylinder magnetic separator almost exclusively dominates the entire field of weak magnetic field magnetic separators. Currently, strontium or barium ferrite-based magnetic separator barrel surface of the magnetic flux density is generally 120 ~ 180mT; 1050mm or more in diameter of some large-diameter cylindrical rare earth magnetic separator with ferrite-based high magnetic energy product, cylindrical surface of the magnetic flux density reaches 180 ~ 200mT; neodymium-iron-boron, cobalt, copper, cerium and strontium ferrite composite magnetic system, the magnetic flux density up to the surface of the cylinder 400mT ..
The wet type permanent magnetic cylinder magnetic separator is divided into three types according to the tank structure: the downstream flow type, the counter flow type and the semi-reverse flow type. The suitable particle size is 6~0mm, 1.5~0mm and 0.5~0mm.
The permanent magnet cartridge magnetic separator is widely used for the selection of ferromagnetic minerals and the concentration of pulp before or before re-grinding. For the rough selection operation, the weak magnetic separation operation before the strong magnetic separator (for the selection of strong magnetic minerals to prevent the magnetic clogging of the strong magnetic separator) and the concentration operation, a large magnetic diameter machine with high magnetic induction intensity should be selected. The selected work directly uses a magnetic separator with a lower magnetic induction.
The processing capacity of the permanent magnetic cylinder magnetic separator should generally be selected according to the actual specifications of the same specifications and the same performance magnetic separator. If the cylinder length is different, it can be calculated as follows:
q=q 0 (L-0.2) (1)
Where q - magnetic separator processing capacity (dry mine), t / h;
q 0 —— the effective throughput of the unit, t/(m·h), which is similar to the factory and mine index;
L——magnetic separator geometry cylinder length, m.
The main production examples of the wet permanent magnetic cylinder magnetic separator are shown in Table 1.
Table 1 Production example of wet permanent magnetic cylinder magnetic separator
Factory name | Equipment specifications / mm | operation | Feeding particle size -0.074mm% | Feed concentration /% | Processing capacity /t·h -1 | Selection indicator /% | |||
Giving grade | Concentrate grade | Tailings grade | Job recovery rate | ||||||
Shougang iron ore processing plant | 101050×2400 | One magnetic | 45 | 53.68 | 60~75 | 28.23 | 55.33 | 9.08 | 81.15 |
750750×1800 | Two magnetic | 65 | 55.0 | 40 | 61.78 | 65.07 | 9.17 | 99.12 | |
Angang Dagushan Concentrator | 101050×2400 | Rough selection | 40~42 | 52~100 | 41~43 | 47~49 | 8~8.5 | 97 | |
750750×1800 | Featured | 80~85 | 30~35 | 20~40 | 57~59 | 59~61 | 9~11 | 99.3 | |
Maanshan Nanshan Iron Ore Concentrator | 101050×2400 | One magnetic | 40.32 | 70.81 | 32.56 | 52.0 | 10.40 | 85.07 | |
Two magnetic | 37.72 | 52.00 | 63.68 | 11.07 | 95.27 | ||||
780780×1800 | Three magnetic | 29.27 | 63.68 | 64.88 | 14.70 | 99.4 | |||
Bengang Nanfen Concentrator | 780780×1800 | Demineralization magnetic separation | 75 | 37.5 | 52.15 | 61.60 | 16.52 | 3.30 | |
Bengang Shantoushan Iron Ore Concentrator | 750750×1800 | Demineralization magnetic separation | 75 | 50 | 43.5 | 58.86 | 62.55 | 6.80 | 99.23 |
Two magnetic | 47.6 | 26.3 | 66.58 | 67.17 | 12.65 | 99.80 | |||
Angang Sintering Plant (roasting - magnetic separation) | 770770×1800 | Demineralization magnetic separation | 75 | >20 | 54 | 60 | 11 | 97.5 | |
Anshan Qidashan Concentrator (roasting - magnetic separation) | 101050×2100 | One magnetic | 46 | 36 | 34 | 30 | 55 | 6.9 | 88 |
101050×2100 | Two magnetic | 70 | 22.4 | 26.67 | 59 | 62 | 13 | 98.7 | |
Second, the magnetic dehydration tank
The magnetic dewatering tank is a magnetic separation device that combines magnetic force and gravity. The magnetic induction intensity is generally 30~50mT. It is divided into two types: electromagnetic and permanent magnet. At present, permanent magnetic dehydration tanks are used more often, and are often used before magnetic separation of ferromagnetic minerals. Desliming and pre-selection operations. The magnetic dewatering tank can sort out a large number of fine tailings and take into account the dewatering and dewatering effect; it can also be used for the concentration operation before the magnetite concentrate is filtered. The magnetic dewatering tank has a simple structure, no moving parts, and is easy to operate. However, the water consumption is large and the equipment configuration height difference is large.
The amount of magnetic dewatering tank treatment can be selected according to the actual index of similar mines, or it can be calculated as follows:
q=3.6AÏ… (2)
Where q is the amount of treatment by overflow meter, m 3 /h;
A——the overflow area of ​​the magnetic dewatering tank, m 2 ;
υ——Overflow speed, mm/s, when the ore particle size is less than 0.15mm, υ=5mm/s; when less than 0.074, υ=2mm/s. [next]
Third, the magnetic machine
The magnetic agglomerator is an abbreviation of a magnetic agglomeration re-selector (also called a magnetic flocculation re-election machine), which is a device for separating magnetite by the combination of gravity and magnetic force, which can effectively discharge fine particles in coarse concentrate. Lack of life. In this way, in order to meet the requirements of the final concentrate grade, it is only necessary to finely grind this part of the continuous body (otherwise it is necessary to finely grind all the coarse concentrates) to separate the monomers, thereby reducing the fine grinding equipment, energy consumption and materials. Consumption. At present, magnetic condensers have been promoted and used in some magnetic separation plants in China. The main technical parameters of the magnetic condenser are shown in Table 2.
Table 2 Main technical parameters of magnetic polymerizer
Technical Parameters | Model | |||
600600 | 15001500 | 18001800 | 22500 | |
Simplified diameter / mm | 600 | 1500 | 1800 | 2500 |
Sorting area effective height / mm | 850 | 1300 | 1600 | 1200 |
Sorting area effective area / m 2 | 0.25 | 1.57 | 1.91 | 4.71 |
Single machine throughput t/h | 5 | 40 | 55 | 120 |
Unit area treatment /t·m -2 ·h -1 | 20 | 25 | 26 | 25 |
The highest field strength in the sorting area / kA · m -1 | 12 | 20 | 20 | 20 |
Water supply / m 3 · m -1 | 50 | 60 | 150 | |
Overflow rate / mm·s -1 | 20 | 17 | 17 | 18 |
Dry cylinder magnetic separator mainly has CTGR-69 double cylinder permanent magnet magnetic separator and CTG single cylinder and double cylinder permanent magnet magnetic separator. The magnetic induction intensity is 105~125mT, the upper limit of the particle size is 0.5~2mm, the water content of the feedstock is less than 3%, and the processing amount can be calculated as follows:
q=0.000112Ï€RnδbÏ (3)
Where q - dry cylinder magnetic separator processing capacity, t / h;
Ρ——material density, g/cm 3 ;
R——roller radius, cm;
N——the number of rotations of the drum, r/min;
B——roller width, cm;
Δ——the maximum particle size or thickness of the material, cm.
Five, magnetic roller (magnetic pulley)
The magnetic roller has two types of permanent magnet and electromagnetic. The utility model has the advantages of simple structure, can be directly installed on the head of the belt conveyor, or can be assembled into a separate dry magnetic separator, and is mainly used for dry magnetic separation of large particle ferromagnetic minerals. The upper limit of the particle size of the sorting material is 75mm for the general magnetic roller and 350mm for the large magnetic roller (or dry sorting machine).
Magnetic rollers can be used in the following situations:
(1) Pre-selection operation for ferromagnetic minerals, which can be set before the fine crushing operation or before the grinding operation (including self-grinding), to remove the surrounding rock and gangue mixed in the mining process, to improve the ore selection grade and reduce Into the amount of mineral processing, reduce infrastructure investment and production costs.
(2) Closed-circuit roasting operation for roasting magnetic separation plant, sorting out unburned ore, and then returning to roasting to improve roasting quality and sorting index.
(3) It is used for dry selection of gravel discharged from wet self-grinding machine , and some waste rock is removed to improve the production capacity of the system.
(4) For the sorting operation of the rich magnetite to obtain the qualified ore into the furnace ore. [next]
The production examples of the magnetic roller are shown in Table 3.
Table 3 Magnetic roller production example
Factory name | Equipment specifications / mm | Work location or material | Glue bandwidth / mm | Tape speed / m·s -1 | Feeding size / mm | Processing capacity /t·h -1 | Job indicator /% | ||||
Feed mine grade | Concentrate grade | Waste stone grade | Recovery rate | Waste stone Yield | |||||||
Shandong Gold Ridge Iron Ore | 101045×1030 (electromagnetic) | Coarse gravel | 1000 | 1.75 | 200~12 | ~200 | 41.88 | 49.40 | 3.92 | 98.45 | 16.53 |
WISCO Chengchao Iron Mine | CRD650×750 (electromagnetic) | After crushing | 650 | 1.50 | 75~13 | 50~100 | 32.52 | 42.72 | 6.48 | 94.39 | 28.15 |
Magang Taochong Mine | 10001000×970 (permanent magnet) | After crushing | 800 | 1.25 | 50~15 | 115 | 35.88 | 45.11 | 12.76 | 89.85 | 28.53 |
Xuanhua Xiaowuying Concentrator | 870870×945 (permanent magnet) | After crushing | 800 | 75~8 | 50~100 | 4166 | 48.24 | 12.21 | 94.60 | 18.90 | |
Shougang Dashihe Concentrator | 800800×1200 (permanent magnet) | After crushing and grinding | 1000 | 1.44~ 1.66 | 12~0 | 100 | 25.5 | 27~28 | 10.0 | 96 | 11.0 |
Shougang Water Plant Concentrator | 26.5 | 28~29 | 9.5 | 97 | 10.5 | ||||||
Zhejiang Yantie Mine | 630630×860 (permanent magnet) | Self-grinding machine gravel | 800 | 1.21 | 80~3 | 45.69 | 27.03 | 28.13 | 7.6 | 98.49 | 5.36 |
Angang Steel Arch Changling Iron Mine | 11100×1100 (electromagnetic) ф800×800 (electromagnetic) | Ping furnace rich mine | 1000 800 | 1.0 | 1200~75 175~30 30~10 | 100~200 | 57~64 | 20~25 | 93~96 | 7~20 | |
Bengang Shantou Iron Mine | CTDG1516N (permanent magnet) | Self-grinding after coarse crushing | 1600 | 1.0~ 2.5 | 350~0 | 445~586 | 27.58 | 30.21 | 9.17 | 95.84 | 12.50 |
Six, pre-magnetic and demagnetizer
The role of the pre-magnetic is to enhance the agglomeration of the magnetic mineral SSS to facilitate sorting. When the magnetized calcined ore or partially oxidized ore is selected, a pre-magnetic device may be disposed under the magnetic dehydration tank. The pre-magnetic device has two kinds of electromagnetic and permanent magnets, and the magnetic induction intensity is generally 40~50mT.
The function of the demagnetizer is to eliminate the magnetic agglomeration of the magnetic minerals in the slurry to facilitate the classification, fine screening or filtration of the next stage. The demagnetizer is mainly used after a magnetic separation operation, before the fine screening operation and the filtration operation. The choice of the demagnetizer should first determine the required magnetic field strength based on the mineral coercive force Hc. Generally, the demagnetizing field should be greater than 5 times the coercive force of the mineral (the anastotropic magnetic force of the Anshan-type natural magnetite is Hc=6366Am, and the roasting ore Hc=12732Am is on the right); the second is that the pulp is guaranteed to pass the demagnetizer for a certain period of time, the slurry flow rate Generally, it should not exceed 1.5~2.5m/s. Several kinds of demagnetizers with better effect are listed in Table 4.
Table 4 Demagnetizer performance
Specifications and models | XTQ-1 power frequency demagnetizer | TC-100 power frequency demagnetizer | ZTQ-1 medium frequency demagnetizer | , MT-2 super power frequency pulse demagnetizer | DQ-1 harmonic wave demagnetizer |
Input voltage / V | 380 | 380 | 380 | 380 | .340~440 |
Input current /A | 20~25 | 85 | 30 | 4 | 2~3 |
Power consumption / kV · A | 7.6~9.5 | 32.5 | 11.4 | 1.52 | |
Coil inner diameter / mm | 260260 | 100100 | 270270 | 200200 | 230230,Ñ„179 |
Coil length / mm | 400 | 700 | 400 | 300 | 800 |
Demagnetization frequency / Hz | 50 | 50 | 500 | 600 | 250 (1500~3000 after synthesis) |
Highest field strength / kA·m -1 | 80 | 64 | 80~199 | 48 | 72~100 |
Coil cooling method | Water cooling | Oil cooler | Water cooling | Self-cold | Self-cold |
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