WO2017120707A1

WO2017120707A1 - Magnetic separation device forming high-density magnetic peak values using micro pole pitches

Info

Publication number: WO2017120707A1
Application number: PCT/CN2016/000337
Authority: WO
Inventors: 潘静娴
Original assignee: 潘静娴
Priority date: 2016-01-11
Filing date: 2016-06-23
Publication date: 2017-07-20
Also published as: CN105413858A; ZA201605788B

Abstract

Provided is a magnetic separation device forming high-density magnetic peak values using micro magnetic sources and micro pole pitches with an opening magnetic system. The magnetic separation device comprises a plurality of magnetic sources having the same size, wherein the plurality of magnetic sources are arranged in parallel, and two adjacent magnetic sources are arranged in a short range, so that dense uneven magnetic peaks are formed on the surface of the combined magnetic sources; and the magnetic peak value at the edge of each adjacent magnetic source is greater than that in the centre of the magnetic source body. The magnetic separation device is used for sorting fine-grained minerals. Since the distance between magnetic sources is close and the pole pitch is small, a dense uneven magnetic peak value variation is formed in a small area. Since the magnetic peak values of a working face formed by the magnetic system are clearly demarcated in a small area range, the adsorption force on the surface of the magnetic system is formed in lines or dots, the fine-grained minerals are easily sorted and the accuracy of mineral separation is increased.

Description

Magnetic separation device for forming high-density magnetic peak using minute magnetic pole pitch

Technical field

The invention belongs to the field of magnetic separation devices, and in particular, a magnetic separation device for forming high-density magnetic peaks by using a small magnetic pole pitch is designed.

Background technique

The increasing minerality of poor, miscellaneous and finely selected minerals is a prominent feature of mineral resources in the world today. According to statistics, 1/3 of the world's phosphate minerals, 1/6 of copper-containing minerals, 1/5 of tungsten-containing minerals, 1/10 of iron ore mined in the United States, 1/2 of Bolivian tin mines, and Other millions of tons of minerals are lost in the form of fine particles. This loss is fundamentally attributed to the difficulty in efficient sorting and recovery of fine-grained minerals. Increasingly thinner, the sorting of fine-grained minerals has become an important part of current mineral sorting, and it has attracted more and more people's attention. How to effectively sort fine-grained minerals is a major problem in the mineral processing industry.

Summary of the invention

In order to solve the above drawbacks, the present invention proposes a magnetic separation device that forms a high-density magnetic peak using a minute magnetic pole pitch, which utilizes a non-uniform high-density magnetic peak to achieve sorting of fine-grained minerals.

The technical solution of the present invention is implemented as follows:

A magnetic separation device for forming a high-density magnetic peak using a small magnetic pole pitch, comprising a plurality of magnetic sources of the same size, a plurality of magnetic sources arranged in parallel, and adjacent magnetic sources are arranged at close distances; A dense uneven magnetic peak is formed, and the magnetic peaks of the adjacent two magnetic source edges are larger than the magnetic peaks at the center of the magnetic source.

Wherein, the magnetic source is an electromagnetic source or a permanent magnet source.

Wherein, the distance between the adjacent two magnetic sources is 0.02 to 2 mm.

Among them, each magnetic source has a width of 4 to 15 mm.

Wherein, the magnetic separation device of the invention is used for sorting fine-grain grade minerals, and the shape thereof is a rectangular parallelepiped, a cube, a trapezoid, a trough or a polygon.

Wherein, the plurality of magnetic sources are arranged in a plurality of rows and columns, and the polarity of each of the magnetic sources is opposite to the polarity of the adjacent four magnetic sources.

Preferably, the plurality of magnetic sources are arranged in a plurality of rows and columns, and the polarity of each of the magnetic sources is opposite to the polarity of the adjacent four magnetic sources in the row direction/column direction, and the polarity of each magnetic source is in the column direction / The row direction is opposite to the polarity of the adjacent four magnetic sources.

Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts an open magnetic system, and uses a micro magnetic source and a micro magnetic pole to form a magnetic separation device with a high-density magnetic peak, which is used for sorting fine-grained and fine-grained. Granular grade minerals, whose magnetic separation is mainly at the contact between two adjacent magnetic sources; because the size of the magnetic source is small, and the adjacent two magnetic sources are closely spaced, the adjacent two magnetic sources are in contact The magnetic peak formed above the surface is large, and the magnetic peak at the center of the magnetic source is small, so that dense and uniform magnetic peak changes are formed in a small area, and the magnetic peak has a strong adsorption force and a small magnetic peak position. The adsorption force is poor, and the magnetic peaks are distinct in a small area, so the adsorption force of the magnetic system surface is formed by lines or dots. It is easy to select fine-grained, fine-grained minerals with high precision in beneficiation.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic view showing the arrangement of magnetic sources of the present invention.

FIG. 2 is a schematic view showing the distribution of magnetic peaks of FIG. 1. FIG.

3 is a schematic view showing another arrangement of the magnetic source of the present invention.

4 is a schematic view showing the distribution of magnetic peaks of FIG. 3.

detailed description

The technical solution in the embodiment of the present invention will be clarified in the following with reference to the accompanying drawings in the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The term "fine particle size" as used in the present invention refers to a mineral having a particle size of 120 mesh or less; the magnetic pole pitch is defined as the distance between two adjacent magnetic sources, that is, the center point of one magnetic source to the center point of an adjacent magnetic source. the distance.

1 to 4, the present invention discloses a magnetic separation device for forming a high-density magnetic peak using a minute magnetic pole pitch for sorting fine-grained, fine-grained minerals in the shape of a rectangular parallelepiped, a cube, a trapezoid, and a groove. Type or polygon. The magnetic source includes a plurality of magnetic sources of the same size, a plurality of magnetic sources are arranged in parallel, and two adjacent magnetic sources are arranged at close distances, and the distance between the adjacent two magnetic sources is 0.02 to 2 mm; the magnetic source The surface forms dense inhomogeneous magnetic peaks, and the magnetic peaks of the adjacent two magnetic source edges are larger than the magnetic peaks at the center of the magnetic source. The magnetic source of the present invention is an electromagnetic source or a permanent magnet source, and each of the magnetic sources of the present invention has a width of 4 to 15 mm.

The plurality of magnetic sources of the present invention are arranged in a plurality of rows and columns, and are arranged in two ways: (1) as shown in FIG. 1, the polarity of each magnetic source is opposite to the polarity of four adjacent magnetic sources; As shown in FIG. 3, the polarity of each magnetic source is opposite to the polarity of the adjacent four magnetic sources in the row direction/column direction, and the polarity of each magnetic source is in the column direction/row direction and adjacent four The polarity of the magnetic source is reversed.

The method for realizing the magnetic pole pitch is as follows: (1) The magnetic source and the magnetic source are arranged at a close distance. When the magnetic source has a certain size, the gap between the adjacent magnetic sources is small, so the magnetic pole distance is reduced. A dense uneven magnetic peak change is formed in a small area; (2) the volume of the magnetic source is reduced, and the number of magnetic sources arranged in the same volume is increased, and the number of magnetic sources is larger, and the number of magnetic poles is larger, within the same volume. The smaller the magnetic pole pitch of the adjacent two magnetic sources arranged, the more dense and uneven magnetic peak variation is formed in a small area.

The invention realizes the magnetic pole pitch variation by the above two methods, thereby realizing the formation of dense uneven magnetic peak variation in a small area, and the principle analysis is as follows:

(1) The magnetic source arrangement of the present invention forms an open magnetic system, and the main structural parameters of the open magnetic system include the magnetic pole pitch, the ratio of the width to the width of the pole gap, the height of the magnetic system, the width, the radius, and the number of poles.

Among them, the number of poles of the magnetic system

Where: L is the length of the magnetic system; l is the pole pitch; the height of the magnetic source is

Where S is the magnetic pole cross-sectional area.

Since the magnetic pole pitch of the present invention is 4.02 to 17 mm, when the open magnetic system is arranged in a plane, the magnetic field unevenness coefficient is C=π/l, and the magnetic field force Fmy is Fmy=(HgradH)y=CH0exp(-2cy). In the formula, Fmy is the magnetic field force, the unit is A2/m3; H is the magnetic field strength, the unit is A/m; gradH is the magnetic field gradient, the unit is A/m2; H0 is the magnetic field strength on the polar surface (the pole gap surface) The unit is A/m; y is the size of a point in space in the Y direction, and the unit is m.

It can be known from the formula Fmy=(HgradH)y=CH0exp(-2cy) that to achieve maximum Fmy in a magnetic field (arbitrary space value y), it is necessary to realize C→∞+, which can be achieved by minimizing the magnetic pole distance l; The reduction of the magnetic pole distance l can be achieved by closely arranging the magnetic source to achieve a small magnetic pole pitch, or by reducing the length of the magnetic pole side; therefore, the volume of the magnetic source is reduced, and the number of magnetic sources arranged in the same volume is increased, and the number of magnetic sources is increased. The more the number of magnetic poles, the smaller the magnetic pole pitch of two adjacent magnetic sources arranged in the same volume, so that a denser uneven magnetic peak change is formed in a small area, and the adsorption force is stronger. figure 2.

(2) The magnetic source of the present invention has a small size, the width of the magnetic source is 4 mm to 15 mm, and by using a small magnetic source to form a plurality of magnetic poles, a denser magnetic peak change is realized in both the row direction and the column direction, thereby realizing Improve the effect of concentrate grade and recovery rate.

The number of poles of the magnetic system of the present invention

Where L is the length of the magnetic system; l is the magnetic system pole pitch. By using a small magnetic source, the magnetic peaks in the direction of the row and column are small and high, so that the leakage is avoided and the amount of processing is ensured. At the same time, the magnetic peaks are high and low, so that the adsorption force of the magnetic surface is The line or the point is formed, so the ore particles roll on the surface of the magnetic source under the action of the adsorption force, which can effectively remove the inclusions, improve the taste and recovery rate of the concentrate, and easily select fine-grained and fine-grained minerals.

In the magnetic separation process, the mineral is transported to the top of the magnetic separation device through the conveyor belt, because the magnetic peak on the magnetic separation device is high or low (ie, the adsorption force on the surface of the magnetic separation device is high or low), so the mineral is passed through the magnetic separation device. When the minerals of different particle sizes are sorted under the adsorption of different adsorption forces, the minerals that are not sorted can be sorted at the subsequent magnetic peaks due to the continuous movement of the minerals. The present invention is due to the magnetic peak. The size of the small area is high and low, so it is easy to sort fine-grained and fine-grained minerals.

Taking a magnetic source of 15mm × 4mm × 5mm (small magnetic source) and 150mm × 40mm × 50mm (large magnetic source) as an example, the small magnetic source and the large magnetic source are arranged in the same volume, and two adjacent Between magnetic sources The distance is 0.5 mm, and the finite element analysis method (ANSYS10.0) is used for 2D analysis. The magnetic peak change is analyzed to find that the magnetic source material is the same in the case of a certain volume, and the distance between the magnetic source and the magnetic source is the same. Under the condition, the magnetic peak between the magnetic source and the magnetic source obtained by using a small magnetic source is denser than that of the large magnetic source, and it is easier to select fine-grained and fine-grained minerals.

Take two sets of 15mm × 4mm × 5mm (small magnetic source) as an example. The two sets of magnetic sources are respectively arranged in the same volume. Among the magnetic sources, the distance between two adjacent magnetic sources is 0.5 mm. The distance between the other two adjacent magnetic sources is 1.5 mm. The finite element analysis (ANSYS10.0) is used for 2D analysis, and the change of the magnetic peak is analyzed. The magnetic source material is the same under a certain volume. Under the condition that the magnetic source is the same size, the smaller the distance between the magnetic source and the magnetic source, the magnetic peak between the magnetic source and the magnetic source is denser than that of the large magnetic source, and it is easier to select the fine-grained and fine-grained Granular grade minerals.

The following four methods for preparing the magnetic separation device of the present invention are exemplified as follows:

(1) Magnetic separation device for sorting limonite and hematite:

On the upper surface of a cylindrical cylinder having a diameter of 1200 mm and a length of 2000 mm, a micro permanent magnet source is filled along the radial direction and the axial direction thereof, and the adjacent two micro magnetic sources have opposite polarities. The micro magnetic source grade N42 is 15 mm long. The width is 4 mm and the height is 3 mm, wherein the height is the excitation direction of the magnetic source. The surface magnetic field strength of the magnetic action surface is 4500 to 5000 GS. The cylindrical cylinder is a magnetizer made of a common steel plate having a thickness of 8 mm; the cylindrical cylinder is connected to the transmission of the magnetic separation device through a shaft. Thus, the magnetic roller was made into a magnetic separation device having a diameter of 1200 mm and a length of 2000 mm. The magnetic separation device is installed on the magnetic separation device, and the magnetic separation device can be used for sorting limonite and hematite, and the daily processing ore can reach 500 tons.

For example, the separation of limonite with a particle size of 0.15 mm is compared with the SLON vertical ring pulsation magnetic separation device. When the original ore taste is 39.63%, the magnetic separation device can obtain 55.26% of the concentrate and 16.13 of the tailings. %, the recovery rate was 83.66%; while the SLON vertical ring pulsation magnetic separation device had a concentrate of 52.54%, a tailings of 22.8%, and a recovery rate of 75.55%.

(2) Magnetic separation device for sorting iron in red mud:

The magnetic roller is prepared by the method of (1) for sorting the limonite and hematite magnetic separation device into a magnetic separator with a diameter of 1500 mm and a length of 4000 mm, and the micro magnetic source grade N48 is 15 mm long and 4 mm wide. The height is 5 mm, where the height is the excitation direction of the magnetic source. The surface magnetic field strength of the magnetic action surface is 5000~ 5500GS. The magnetic separation device is installed on the magnetic separation device, and the magnetic separation device can be used for sorting iron in the red mud, and the daily processing ore can reach 1,000 tons.

For example, the red mud in the Pingguo area of Guangxi is sorted. When the original ore taste is 26.02%, the magnetic separation device can obtain 58.23% of the concentrate taste, the tailings taste is 21.05%, and the recovery rate is 41.70%.

(3) Magnetic separator for sorting chromite:

The magnetic roller is prepared by the method of (1) for sorting the limonite or hematite magnetic separation device into a magnetic separator with a diameter of 1200 mm and a length of 2000 mm, and the micro magnetic source grade N42 is 15 mm long and 4 mm wide. The height is 4 mm, where the height is the excitation direction of the magnetic source. The surface magnetic field strength of the magnetic action surface is 3000 to 3500 GS. The magnetic separation device is installed on the magnetic separation device, and the magnetic separation device can be used for the separation of chromite ore, and the daily processing of the original ore can reach 500 tons.

For example, when the chromite ore having a particle size of 0.15 mm is sorted, when the chromium in the original ore taste is 28.17%, the magnetic separation device can obtain the refined taste of the taste of chromium of 49.27%, the taste of iron is 16.70%, and the chromium in the tailings. The taste is 10.70% and the recovery of chromium is 78.00%.

(4) Magnetic separation device for sorting manganese ore:

The magnetic roller is prepared by the method of (1) for sorting the limonite or hematite magnetic separation device into a magnetic separator with a diameter of 1500 mm and a length of 3000 mm, and the micro magnetic source grade N50 is 9 mm long and 9 mm wide. The height is 6mm, where the height is the excitation direction of the magnetic source. The surface magnetic field strength of the magnetic action surface is 5500-6000 GS. The magnetic separation device is installed on the magnetic separation device, and the magnetic separation device can be used for the separation of chromite ore, and the daily processing ore can reach 750 tons.

For example, when the manganese ore having a particle size of 0.2 mm is sorted, when the chromium content of the original ore is 24.7%, the magnetic separation device can obtain a concentrate taste of 42.38%, a tailings taste of 7.10%, and a recovery rate of 65.20%.

All of the above four magnetic separation devices have been commercially successful.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

A magnetic separation device for forming a high-density magnetic peak using a minute magnetic pole pitch, characterized in that it comprises a plurality of magnetic sources of the same size, a plurality of magnetic sources are arranged in parallel, and adjacent magnetic sources are arranged at close distances;

The magnetic source surfaces all form dense uneven magnetic peaks, and the magnetic peaks of the adjacent two magnetic source edges are larger than the magnetic peaks at the center of the magnetic source.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch as claimed in claim 1, wherein the magnetic source is an electromagnetic source or a permanent magnet source.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch according to claim 2, wherein a distance between adjacent two magnetic sources is 0.02 to 2 mm.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch as claimed in claim 3, wherein each of the magnetic sources has a width of 4 to 15 mm.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch according to claim 4, which is used for sorting fine-grained minerals in the shape of a rectangular parallelepiped, a square, a trapezoid, a groove or a polygon.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch according to any one of claims 1 to 5, wherein the plurality of magnetic sources are arranged in a plurality of rows and columns, and the polarity of each of the magnetic sources It is opposite in polarity to the adjacent four magnetic sources.
A magnetic separation apparatus for forming a high-density magnetic peak using a minute magnetic pole pitch according to any one of claims 1 to 5, wherein the plurality of magnetic sources are arranged in a plurality of rows and columns, and the polarity of each of the magnetic sources is The row direction/column direction is opposite to the polarity of the adjacent four magnetic sources, and the polarity of each magnetic source is opposite to the polarity of the adjacent four magnetic sources in the column/direction direction.