GB/T 38947-2020Magnetic flux density test method for magnetic separators (English PDF)

2.1 Magnetic separation equipment

Technical equipment that uses magnetic force to separate mixtures with different specific magnetic susceptibility.

2.1.1 Open gradient magnetic separation equipment

The natural magnetic field gradient is formed by the working distance of the magnetic source (electromagnet or permanent magnet), or by the permanent magnet system of alternating polarity or electromagnetic magnet

It is a magnetic separation equipment that forms a magnetic field gradient in the separation zone.

2.1.2 Closed gradient magnetic separation equipment

A magnetic separation device that uses permanent magnets or electromagnet pole pairs to properly deform a magnetic pole head to generate a magnetic field gradient.

2.1.3 Multi-gradient magnetic separation equipment

A magnetic separation device with multi-gradient magnetic force is generated by using a magnetic concentrating medium arranged in a cavity composed of a permanent magnetic system or an electromagnetic magnetic system.

2.2 Magnetic induction

A physical quantity (vector) that indicates the strength and direction of the magnetic field.

Note. Magnetic induction is also called magnetic flux density or magnetic flux density, and the unit is T.

2.3 Magnetic flux leakage induction

When the magnetic source generates magnetic force in the sorting area, it leaks the magnetic force in the relevant auxiliary parts and the work area or maintenance area.

2.4 Background magnetic induction

The magnetic induction intensity when there is no magnetizing medium in the separation area of the magnetic separation equipment.

2.5 Sorting area

The selected materials are divided into separate spaces for magnetic and non-magnetic materials.

2.6 Magnetic media

Tooth-shaped, round, grid or fibrous ferromagnetic filling made of magnetically conductive materials.

3.1 Open gradient magnetic separation equipment

Open gradient magnetic separation equipment mainly includes flat magnetic separators, drum magnetic separators, roller belt magnetic separators, permanent magnet magnets, permanent magnets

Strip, grid type permanent magnet magnetic separation device, suspended electromagnetic or permanent magnet magnetic separation device, channel type permanent magnet magnetic separation device, pipeline type permanent magnet magnetic separation device and slippery

Slot plate type permanent magnet magnetic separator.

3.2 Closed gradient magnetic separation equipment

Closed gradient magnetic separation equipment mainly includes electromagnetic induction roller magnetic separator, electromagnetic induction disc magnetic separator and cross-belt electromagnetic (permanent magnet) magnetic

Choose machine.

3.3 Multi-gradient magnetic separator

Multi-gradient magnetic separators mainly include flat ring media magnetic separators, vertical ring media magnetic separators and tank media magnetic separators.

4.1 Testing equipment

The detection of magnetic induction intensity of magnetic separation equipment should adopt one-dimensional or three-dimensional magnetometer and three-dimensional fluxgate magnetometer.

4.1.1 Magnetic induction intensity detection in the sorting area

When the magnetic induction intensity of the sorting area is tested, a one-dimensional or three-dimensional magnetometer should be used, and the detection accuracy level is 1.0.

4.1.2

Detection of magnetic flux leakage induction in the working range of the whole machine

When detecting the magnetic flux leakage induction intensity of the working range of the whole machine, a three-dimensional magnetometer or a three-dimensional fluxgate magnetometer should be used. The detection accuracy level is

0.5 level.

4.2 Detection range

The magnetic induction intensity detection range of magnetic separation equipment includes. sorting area, main components, operation space and maintenance space.

5.1 Open gradient magnetic separation equipment

The magnetic induction intensity detection method of the open gradient magnetic separation equipment should meet the requirements of Appendix A.

5.2 Closed gradient magnetic separation equipment

The magnetic induction intensity detection method of closed gradient magnetic separation equipment should meet the requirements of Appendix B.

5.3 Multi-gradient magnetic separation equipment

The magnetic induction intensity detection method of multi-gradient magnetic separation equipment should meet the requirements of Appendix C.

Appendix A (Normative appendix)

Magnetic induction intensity detection method of open gradient magnetic separation equipment

A.1 Plate type permanent magnet magnetic separator

A.1.1 Magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the surface of the sorting belt above the plane permanent magnet system, and use a one-dimensional or three-dimensional Hall probe along its belt.

The sorting length (X), sorting width (Y) and sorting depth (Z) on the test points of each section of the surface are tested, and the test value should be measured in the perpendicular magnetic system (each

The maximum value (mT) of the magnetic flux density in each direction of the (magnetic pole) surface is expressed. The schematic diagram of detection is shown in Figure A.1.

Figure A.1 Schematic diagram of magnetic flux density detection of flat-plate permanent magnetic separator

A.1.2 Test of magnetic flux leakage induction intensity of the whole machine

The magnetic flux leakage induction intensity detection of the whole machine should adopt the three-dimensional Hall probe to the magnetic flux leakage inductance of the feeding box, rinsing tube, discharge hopper, frame and related parts

The intensity should be tested. The magnetic flux leakage induction intensity of each component and the whole machine in the operating space and maintenance space should not exceed 10mT, 3m outside the area

The magnetic flux leakage induction intensity of the domain should not exceed 0.5mT.

A.1.3 Magnetic technical parameters

The magnetic technical parameter should be the magnetic induction intensity (mT) of the magnetic separation surface of the equipment, and the magnetic induction at one or more places in the separation area can be used.

Intensity expression should not be expressed by theoretical or estimated values.

A.2 Magnetic rods and magnetic plates

Permanent magnet magnet bar, permanent magnet magnet strip, permanent magnet magnetic grid, suspended electromagnetic or permanent magnet magnetic separator and chute plate permanent magnet magnetic separator

The detection of the magnetic induction intensity of the sorting area and the magnetic flux leakage induction of the whole machine can be carried out according to the regulations of A.1.1~A.1.3.

A.3 Cylindrical permanent magnet magnetic separator

A.3.1 Magnetic induction intensity detection of the sorting cylinder

A.3.1.1 The magnetic induction intensity test of the sorting cylinder should be based on the surface of the magnetic cylinder, and the separation width (axis

To X), the sorting length (arc length Y), and the sorting depth (Z) detection points for detection, and the value adopts the detection points of the perpendicular magnetic system (each magnetic pole).

The maximum magnetic induction intensity (mT) in the middle is indicated. The dry magnetic cylinder should deal with the surface magnetic induction intensity and a certain depth (related to the sorting particle size)

The magnetic induction intensity is tested; in addition to detecting the magnetic induction intensity of the surface, the wet magnetic cylinder should also detect the magnetic induction at a depth of 50mm

Response intensity, the detection value is expressed by the maximum magnetic induction intensity (mT) in each direction. The schematic diagram of detection is shown in Figure A.2 and Figure A.3.

Figure A.2 Schematic diagram of magnetic flux density detection of dry-process barrel structure Figure A.3 Schematic diagram of magnetic flux density detection of wet-process barrel structure

A.3.1.2 For the magnetic induction intensity at any specific depth, one-dimensional or three-dimensional magnetometers can be used for detection, and the detection value adopts all-directional magnetic

The maximum induction intensity (mT) is expressed.

A.3.1.3 The magnetic induction intensity of each magnetic pole can be measured by one-dimensional or three-dimensional Hall probes with the center point of the sorting cylinder as the axis continuously or in sections.

Perform detection, the magnetic induction intensity of the magnetic poles in the 100mm section close to both ends should not be within the weighted calculated value range.

A.3.2 Whole machine leakage magnetic flux induction intensity detection

When testing the magnetic flux leakage induction intensity of the feeding box, unloading pipe, sorting cylinder end cover, rotating shaft, discharge box and frame and other related auxiliary facilities,

The three-dimensional Hall probe is used for detection, and the magnetic flux leakage induction value should meet the requirements of A.1.2.

A.3.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

A.4 Inner cylinder magnetic separator

The detection of the magnetic induction intensity of the separation zone of the inner cylinder magnetic separator and the magnetic flux leakage induction of the whole machine can be carried out according to the provisions of A.3.1~A.3.3.

A.5 Roller Permanent Magnetic Separator

A.5.1 Magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the surface of the sorting belt wound on the magnetic roller, and a one-dimensional or three-dimensional Hall probe

The upper sorting belt is continuously tested along the axial (X), radial (Y) and depth (Z) magnetic poles one by one, and its value should be the highest magnetic induction intensity in each direction.

Large value (mT) said. The first magnetic pole and the last magnetic pole on the magnetic roller belt should not be in the average calculation range. The schematic diagram of detection is shown in Figure A.4.

Figure A.4 Schematic diagram of magnetic induction intensity detection of roller permanent magnetic separator

A.5.2 Test of magnetic flux leakage induction intensity of the whole machine

When testing the magnetic flux leakage induction intensity of the feeding box, magnetic roller end cover, rotating shaft, discharge box and frame, the three-dimensional Huo

The magnetic flux leakage induction intensity value should meet the requirements of A.1.2 for detection by the Er probe.

A.5.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

A.6 Channel iron removal device

The detection of the magnetic induction intensity of the channel type permanent magnet magnetic separator and the pipeline type permanent magnetic magnetic separator and the magnetic flux induction intensity of the whole machine can be

The provisions of A.5.1~A.5.3 shall be implemented.

Appendix B (Normative appendix)

Magnetic induction intensity detection method of closed gradient magnetic separation equipment

B.1 Induction disc electromagnetic magnetic separator

B.1.1 Magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the tip of the electromagnetic induction disk or the surface of the conveyor belt, and use one-dimensional or three-dimensional Hall detection

Head along the disc tip (X) for detection, and its value should be expressed in terms of the maximum magnetic induction intensity (mT) in each direction. The schematic diagram of detection is shown in Figure B.1.

Figure B.1 Schematic diagram of magnetic induction intensity detection of electromagnetic induction disc magnetic separator

B.1.2 Test of magnetic flux leakage induction of the whole machine

When testing the magnetic flux leakage induction intensity of the feeding device, conveyor belt roller, discharge hopper and rack and other related auxiliary facilities, three-dimensional Huo

The magnetic flux leakage induction intensity value should meet the requirements of A.1.2 for detection by the Er probe.

B.1.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

B.2 Electromagnetic induction roller magnetic separator

B.2.1 Magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the tooth tip edge of the induction magnetic roller, and a one-dimensional or three-dimensional Hall probe should be used to detect the magnetic roller.

The sorting width (X), each magnetic pole gear (arc length Y) is tested by its magnetic depth (Z), and its value should be the maximum magnetic induction intensity in each direction

Value (mT) said. The magnetic flux density of the first tooth point and the last tooth point should not be within the weighted calculation range. See the detection diagram

Figure B.2.

B.2.2 Whole machine leakage magnetic flux induction intensity detection

When testing the magnetic flux leakage induction intensity of the feeding device, magnetic roller support mechanism, discharge hopper and rack and other related auxiliary facilities, three-dimensional

For Hall probe detection, the flux leakage induction intensity value should meet the requirements of A.1.2.

Figure B.2 Schematic diagram of magnetic induction intensity detection of electromagnetic induction roller magnetic separator

B.2.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

B.3 Electromagnetic induction cross-belt magnetic separator

B.3.1 Magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the surface of the sorting tape on the wrapping induction pole head, and a one-dimensional or three-dimensional Hall probe

The separation width (X) and separation length (Y) of the tape surface under the electromagnetic pole head are tested for magnetic force surface and separation depth (Z).

It should be expressed in terms of the maximum magnetic induction intensity (mT) in each direction. The first magnetization point and the last magnetization point on the separation belt should not be within the calculated value range.

Surrounding. The schematic diagram of detection is shown in Figure B.3.

Figure B.3 Schematic diagram of magnetic induction intensity detection of cross-belt magnetic separator

B.3.2 Test of magnetic flux leakage induction intensity of the whole machine

When testing the magnetic flux leakage induction intensity of the feeding device, belt roller, discharge hopper and rack and other related auxiliary facilities, the three-dimensional Hall should be used.

For probe detection, the flux leakage induction value should meet the requirements of A.1.2.

B.3.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

Appendix C (Normative appendix)

Method for detecting magnetic induction intensity of multi-gradient magnetic separation equipment

C.1 Flat ring media multi-gradient magnetic separator

C.1.1 Continuous detection of magnetic induction intensity of magnetic medium in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the tooth tip of the magnetic gathering gear plate medium stack in the sorting area, and a one-dimensional or three-dimensional Hall probe

The component selection box and the magnetic gathering gear plate media stack are carried out continuously, and the detection depth is the middle part, and the detection value should be the maximum magnetic induction intensity in each direction (mT) means. The schematic diagram of detection is shown in Figure C.1.

C.1.2 Intermittent detection of magnetic induction intensity of magnetic medium in the sorting area

One-dimensional or three-dimensional Hall probes should be used to lay out the magnetic media (tooth plates), and the dots should be tested according to the specifications.

The maximum magnetic induction intensity (mT) indicates.

Figure C.1 Schematic diagram of the magnetic field intensity detection point of the toothed plate magnetic gathering medium stack

C.1.3 Magnetic induction intensity detection in unloading area

The tooth tip of the magnetic gathering gear plate medium stack in the unloading area should be used as a reference, and a one-dimensional or three-dimensional Hall probe should be inserted into the middle of the magnetic gathering gear plate for continuous feeding

The detection value should be expressed by the maximum magnetic induction intensity (mT) in each direction, where the leakage magnetic induction or residual magnetic induction should not be large

At 5mT.

C.1.4 Whole machine leakage magnetic flux induction intensity detection

When detecting the magnetic flux leakage induction intensity of the feeding system, mechanical operation system and auxiliary components, the three-dimensional Hall probe should be used to detect.

The value of magnetic flux leakage induction should meet the requirements of A.1.2.

C.1.5 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

C.2 Vertical ring media multi-gradient magnetic separator

C.2.1 Detection of background magnetic induction in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the median line in the sorting box, and the one-dimensional or three-dimensional

The detection value should be expressed by the maximum magnetic induction intensity (mT) in each direction. The schematic diagram of the detection is shown in Figure C.2.

The background magnetic induction intensity detection of the center point of the unloading area should be based on the center line of the sorting box, and the detection value should be the magnetic induction intensity in all directions

The maximum value (mT) means that the leakage magnetic induction or residual magnetic induction should not exceed 5mT.

Figure C.2 Schematic diagram of background magnetic induction intensity detection points in the separation area and unloading area of the vertical ring medium multi-gradient magnetic separator

C.2.2 Whole machine leakage magnetic flux induction intensity detection

When detecting the magnetic flux leakage induction intensity of the feeding system, mechanical operation system and auxiliary components, the three-dimensional Hall probe should be used to detect.

The value of magnetic flux leakage induction should meet the requirements of A.1.2.

C.2.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

C.3 Tank-type media multi-gradient magnetic separator

C.3.1 Background magnetic induction intensity detection in the sorting area

The magnetic induction intensity detection of the sorting area should be based on the upper yoke plate (a), middle part (o) and lower yoke plate (b) of the sorting chamber.

Under the condition of the medium, use a one-dimensional or three-dimensional Hall probe (longitudinal configuration) to proceed continuously or set points along the center point of the central position or its periphery.

The detection value should be expressed by the maximum magnetic induction intensity (mT) in each direction. The magnetic induction intensity of the peripheral detection points should not be less than 90% of the center point.

The schematic diagram of the detection is shown in Figure C.3.

C.3.2 Whole machine leakage magnetic flux induction intensity detection

When testing the magnetic flux leakage induction intensity of the feeding system, sorting tank, unloading system, and auxiliary components, the three-dimensional Hall probe should be used to test

Measured, the flux leakage induction value should meet the requirements of A.1.2.

C.3.3 Magnetic technical parameters

The magnetic technical parameter value (mT) should meet the requirements of A.1.3.

C.4 Electromagnetic vibration dry type iron remover

The magnetic induction intensity of the working area of the electromagnetic vibrating dry magnetic separator and the magnetic flux induction intensity of the whole machine can be tested according to the regulations of C.3.1~C.3.3 carried out.

Figure C.3 Schematic diagram of magnetic field intensity detection of tank electromagnetic multi-gradient magnetic separator […]