What is the difference between dry magnetic separation equipment and wet magnetic separation equipment?
Common dry magnetic separation device: Dry separator weak magnetic field (iron, magnetic pulley), dry strong magnetic separator (magnetic roll separator comprises an inductive, electromagnetic disc Dry Intensity Magnetic Separator Dry type roller type magnetic separator
1. Dry magnetic separation equipment application
Common dry magnetic separation equipment: dry weak magnetic field magnetic separator (iron remover, magnetic pulley), dry strong magnetic field magnetic separator (including induction roller magnetic separator, dry electromagnetic disc strong magnetic separator, Dry-to-roll type strong magnetic separator).
(1) Dry weak magnetic separator
1) Iron remover
The iron remover is primarily used to remove entrained iron or iron filings from the stream. There are two kinds of electromagnetic and permanent magnets. There are two types of fixed suspension and belt suspension.
2) Magnetic pulley
Application: It is used for the pre-selection of large (10-120mm) strong magnetic ore. It can sort out the surrounding rock mixed into the ore and reduce the depletion of the original ore. It is generally used after the coarse ore of the raw ore is crushed and the final broken product is ground. The previous selection. The main function is to remove the useless waste rock, improve the ore grade entering the grinding machine, reduce the grinding amount of the grinding machine, and thus reduce the grinding cost. It is necessary to know that the grinding cost accounts for 60% to 70% of the entire ore dressing production, and the dry-selection magnetic pulley can pre-dash the tailings yield by as much as 15% to 20%. Figure 44 is a CT type magnetic pulley.
3) Cylinder magnetic separator
Dry selection for fine-grained ferromagnetic ores is also suitable for removing magnetic impurities and purifying magnetic materials from powdery materials. The figure on the right shows the structure of the CTG magnetic separator.
(2) Dry type strong magnetic separator
Separation of weakly magnetic minerals earliest industrial-type separator is dry, is widely used in sorting of manganese ore, iron oxide or semi-blown, beach sands, wolframite, tin, phosphorus ore and ore. The dry type strong magnetic separator is divided into four types according to its structure: induction roller type, disc type, cylinder type and permanent magnet type.
1) Induction roller magnetic separator
It consists of an electromagnetic system, a sorting system and a transmission system. In order to reduce eddy current heating and transmission power, the magnetic roller is alternately laminated with a thin magnetic conductive steel sheet and a non-magnetic wafer.
application:
Recover the titanium ore sands seaside; high-quality raw materials and cement industries, glass raw materials; feldspar, minerals like andalusite purification; mineral chromite, monazite, wolframite, iron ore sorting.
2) Dry electromagnetic disc type strong magnetic separator
Adapted for sorting than the susceptibility greater than 5.0 × 10-7m3 / kg, a particle size of less than 2 mm weakly magnetic minerals; is used in the metal containing a rare minerals rougher concentrate (such as coarse tungsten concentrates, ilmenite, zircon and Selection of mixed concentrates such as monazite.
3) Dry type roller type strong magnetic separator
structure:
It consists of a feeding hopper, a weak magnetic feeding cylinder, an induction unloading roller, a magnetic roller, a mining hopper and the like. The two magnetic rollers are arranged opposite each other to form a closed magnetic circuit. The two magnetic rollers are driven by the worm gear reduction mechanism and relatively rotated, and the gap is changed by the pole pitch adjustment mechanism. The induction unloading roller is made of industrial pure iron and the surface is processed into a prismatic projection.
Application: For sorting (rough selection, selection, sweeping) of materials containing a variety of different magnetic minerals with a particle size of 3 mm or less.
Application of two wet magnetic separation equipment
Common wet magnetic separator: wet weak magnetic separation equipment (magnetic dewatering tank, permanent magnet cylindrical magnetic separator), wet strong magnetic separation equipment (wet induction roller type strong magnetic separator, Jones type wet strong magnetic separator) Ring magnetic separator).
1. Wet weak magnetic separation equipment
1) Magnetic dehydration tank
Features:
The utility model has the advantages of simple structure, no running parts, convenient maintenance, simple operation, large processing capacity and no power consumption. The disadvantage is that the coarse gangue cannot be drained.
application:
It is mainly used to remove fine-grained gangue and slime, and is sometimes used for concentrated dehydration.
2) Permanent magnet cylindrical magnetic separator
The permanent magnet cylindrical magnetic separator is a magnetic separation device commonly used in magnetic separation plants. According to the structure of the sorting bottom box and the flow direction of the product, it is divided into three types: downstream type, counter flow type and semi-reverse flow type. It is applied most in a semi-reverse type.
(a) CTS permanent magnet cylinder magnetic separator
It is commonly used for the rough selection of coarse ore magnetic particles with a particle size of 5 mm or less. It has high operational reliability and low power consumption, but it cannot obtain the maximum recovery rate and the best concentrate quality.
(b) CTN permanent magnet magnetic separator
0-0.6mm suitable ferromagnetic ore rougher and scavenger, selected from coal and heavy medium recovery industry. This model has high energy consumption.
(c) CTB permanent magnet magnetic separator
The semi-reverse flow magnetic separator is suitable for the rough selection and selection of 0-0.5mm ferromagnetic ore, especially for the selection of 0-0.15mm ferromagnetic ore; the coarse particles in the feed are in the tank The formation of a precipitate in the middle will deteriorate the sorting.
2, wet strong magnetic separation equipment
Suitable for sorting fine particles (0.03-1mm) of weak magnetic minerals (such as hematite, siderite, ilmenite, etc.).
summary:
Dry magnetic separation equipment is different from wet magnetic separation equipment:
(1) Different feeding materials: dry magnetic separation equipment can select ore with a humidity below 5%, while wet magnetic separation equipment must rely on water as a medium magnetic separator.
(2) Different grain sizes: dry magnetic separation equipment is used to select large blocks, coarse particles of ferromagnetism and finer particles of weak magnetic ore (seashore sand). Wet magnetic separation equipment for the separation of fine-grained ferromagnetic ore and fine-grained weak magnetic ore.
(3) Different processes: The dry magnetic separation equipment can realize the separation of minerals without using water, and the process flow is simple. The wet magnetic separation equipment has a complicated process.
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