Dry-method magnetic-gravity combined separation process for magnetic-containing materials

Abstract

The invention discloses a dry-method magnetic-gravity combined separation process for magnetic-containing materials, which comprises the following steps: crushing and screening magnetic-containing minerals in sequence to obtain qualified materials with preset fineness; the obtained qualified materials are separated through a self-gravity dry type magnetic separation shaking table, and magnetic minerals and tailing products are obtained; the self-gravity dry type magnetic separation shaking table comprises a shaking table surface, a tailing receiving hopper and a concentrate receiving hopper are sequentially arranged below the table surface of the table, a concentrate baffle is arranged on one side, close to the concentrate receiving hopper, of the lower surface of the table surface of the table, and the concentrate baffle is fixedly connected with the bottom of the table surface of the table; a magnetic field generating device is arranged above the table surface of the shaking table, the magnetic field generating device is arranged on a magnetic device supporting frame, and a magnetic field generating device movement area is arranged above the table surface; the surface of the shaking table is relatively static, and the magnetic field generating device reciprocates relatively but integrally moves forwards; the lower surface of the shaking table surface is provided with bed strips which are different in height and are mounted in parallel; and the moving direction of the magnetic field generating device is perpendicular to the mounting direction of the bed strips. Magnetic separation and gravity separation are combined, dry separation of magnetic materials and non-magnetic materials is enhanced, the problem of water shortage in the western and even desert areas is solved, and concentrate products with native properties are obtained.

Description

Technical Field

[0001] The present application belongs to the field of mineral processing technology, and specifically relates to a dry magnetic-gravity combined separation process for magnetic materials. Background Art

[0002] Various minerals in the earth's crust coexist closely and form dense aggregates, or smelting slag and solid waste are mixed with various materials of different properties. Due to the different uses of various minerals / materials, it is necessary to separate different minerals in the ore or different materials in the smelting slag and solid waste through ore dressing methods. Gravity separation, magnetic separation and flotation are the most common ore dressing and separation methods, which use the differences in density, magnetism and surface wettability of the target minerals for separation. However, for special sorting situations, the above sorting methods are not very suitable. For example, flotation and traditional wet magnetic separation methods consume a large amount of water and pollute the water quality. In the arid and water-scarce western region and even in desert areas, the application of the above two methods is limited. For example, in the laboratory preparation of high-purity pentlandite, the purity of natural pentlandite is low, and there are a large amount of chalcopyrite and pyrrhotite in the ore, so pentlandite must be separated from chalcopyrite and pyrrhotite. Traditional flotation methods can separate chalcopyrite and even pyrrhotite, but flotation is carried out in water. Pentland pyrrhotite is very easy to oxidize and dissolve when in contact with water, changing its original surface properties. In addition, residual flotation reagents will also affect the surface properties of pentland pyrrhotite, ultimately making it difficult for the purified pentland pyrrhotite to meet the application performance requirements.

[0003] Magnetic separation is a feasible way to remove pyrrhotite or chalcopyrite, but wet magnetic separation also faces the same problems as flotation. In the dry magnetic separation process, especially when using magnetic drums, the material layer is thick and relatively static with the drum surface, making it difficult to solve the problem of magnetic separation entrainment, so that some non-magnetic materials enter the magnetic separation, ultimately affecting the concentrate grade. Therefore, existing mineral processing technology is difficult to meet special mineral processing technology requirements. Summary of the invention

[0004] The purpose of this application is to provide a dry magnetic-gravity combined separation process for magnetic materials, combining magnetic separation with gravity separation, strengthening the dry separation of magnetic materials and non-magnetic materials, solving the problem of water shortage in the western region and even in the desert area, and obtaining a concentrate product with original properties.

[0005] The present invention provides a dry magnetic-gravity combined separation process for magnetic materials, comprising:

[0006] The magnetic minerals are crushed and screened in sequence to obtain qualified materials with a predetermined fineness;

[0007] The qualified materials are separated by a gravity dry magnetic separation shaker to obtain magnetic minerals and tailings products;

[0008] The self-gravity dry magnetic separation shaking table comprises a shaking table surface;

[0009] A tailings receiving funnel and a concentrate receiving funnel are arranged in sequence below the shaking table surface, and a concentrate baffle is arranged on the lower surface of the shaking table surface close to the concentrate receiving funnel, and the concentrate baffle is fixedly connected to the bottom of the shaking table surface;

[0010] A magnetic field generating device is provided above the rocking bed surface, and the magnetic field generating device is arranged on a magnetic device support frame, and the magnetic field generating device movement area is above the bed surface; the rocking bed surface is relatively stationary, and the magnetic field generating device performs relative reciprocation but moves forward as a whole;

[0011] The lower surface of the rocking bed is provided with bed bars of different heights and installed in parallel, and the moving direction of the magnetic field generating device is perpendicular to the installation direction of the bed bars.

[0012] As a further improvement of the above solution, below the shaking table surface is a self-gravity magnetic-gravity separation area;

[0013] In the feeding area, the height of the bed bars is smaller; in the concentrate area, the height of the bed bars is larger, and the height of the bed bars gradually increases from small to large.

[0014] As a further improvement of the above solution, the height of the bed rails is 0.5 mm to 20 mm.

[0015] As a further improvement of the above solution, there is an angle θ between the rocking bed surface and the horizontal direction, 0°<θ<30°.

[0016] As a further improvement of the above solution, the rocking bed surface is supported by a plurality of supports.

[0017] As a further improvement of the above solution, a mobile feeder is provided on one side of the support.

[0018] As a further improvement of the above solution, the mobile feeder is provided with a feeding hopper, which can be moved and rotated to set an inclination angle to facilitate the delivery of mineral raw materials to the feeding area below the shaking table surface.

[0019] As a further improvement of the above solution, a middling ore receiving funnel is provided between the tailings receiving funnel and the concentrate receiving funnel.

[0020] As a further improvement of the above solution, the magnetic field generating device is a permanent magnet or an electromagnet, and the magnetic field strength can be adjusted to meet the requirements of weak magnetism to strong magnetism.

[0021] As a further improvement of the above scheme, the stroke of the asymmetric stroke motion of the magnetic field generating device is 1 to 15 cm / s, the stroke frequency is 1 to 20 c / min; and the magnetic field intensity is 0.1 to 1.0 T.

[0022] As a further improvement of the above solution, a slide rail is provided on the magnetic device support frame, and the magnetic field generating device can reciprocate along the slide rail.

[0023] As a further improvement of the above solution, a driving device is provided on the side of the rocking bed surface, and the driving device is transmission-connected to the magnetic field generating device.

[0024] As a further improvement of the above solution, the lower surface of the shaking table bed is close to the tailings baffle on one side of the tailings receiving funnel.

[0025] As a further improvement of the above scheme, after crushing and screening, qualified materials with -200 mesh accounting for 80% are obtained.

[0026] The above-mentioned dry magnetic-gravity combined separation process of magnetic materials has the following specific process:

[0027] (1) The mixed material of magnetic minerals and non-magnetic minerals is transferred to the feeding hopper of the mobile feeder, and the feeding hopper is moved to the feeding area of ​​the shaking table surface and is parallel to and close to the shaking table surface;

[0028] (2) The initial position of the magnetic field generating device above the shaking table surface is above the feeding area, which will generate a local magnetic field and adsorb the material below the shaking table surface and in the feeding hopper onto the shaking table surface;

[0029] (3) The magnetic field generating device moves along the slide rail from the feed area to the concentrate area. Its movement characteristics are back and forth motion, but the forward stroke is greater than the backward stroke, so the whole moves forward (asymmetric stroke). During the movement of the magnetic field generating device relative to the shaking table surface, the magnetic field of the shaking table surface changes. The magnetic minerals will move with the movement of the magnetic field generating device, while the non-magnetic minerals will fall directly into the tailings receiving funnel due to gravity.

[0030] (4) When the magnetic material moves with the magnetic field generating device, some non-magnetic materials will be entrained in the bed layer. The function of the bed strips is to form convexities and concave depressions on the shaking table surface, causing the material to "tumble" during the movement and release the non-magnetic materials at the bottom of the material (close to the shaking table surface). The non-magnetic materials will fall off the shaking table surface under the action of gravity, thereby achieving the purpose of gradually separating the magnetic materials from the non-magnetic materials.

[0031] (5) The magnetic material eventually accumulates at the concentrate baffle, while the magnetic field generating device continues to move forward and gradually moves away from the concentrate baffle. At the same time, the magnetic field strength of the concentrate baffle gradually weakens, and the magnetic minerals fall into the concentrate receiving funnel under the action of gravity.

[0032] The inclination angle between the shaking table surface and the horizontal plane is θ, which increases the tumbling degree of the material during the rising process under the action of gravity, which is beneficial to further strengthen the separation of non-magnetic materials and prevent the premature falling of magnetic materials, thereby ensuring the recovery rate of magnetic materials.

[0033] The magnetic field strength of the magnetic field generating device is a key factor in determining the sorting index. When sorting strongly magnetic minerals such as magnetite or pyrrhotite, a smaller magnetic field strength is sufficient; when sorting weakly magnetic minerals such as hematite or chalcopyrite, a higher magnetic field strength is required.

[0034] The asymmetric stroke motion characteristics of the magnetic field generator are another key factor in determining the sorting index. The greater the number of strokes, the faster the movement speed of the magnetic field generator, which determines the faster the material moves on the shaking table surface, the more violent the collision and overturning of the bed bars, the easier it is for non-magnetic materials or weak magnetic materials to fall and become tailings products, and only strong magnetic mineral particles can always be adsorbed on the shaking table surface, and finally become high-grade concentrate products. In addition, under high-stroke conditions, the relative speed difference between the magnetic field generator and the material will be relatively large, which will lead to a larger distance between the material layer and the magnetic field generator, and the magnetic force on the material will decrease, which will also promote the decline of non-magnetic materials and weak magnetic materials. In addition, the greater the forward stroke of the magnetic field generator and the smaller the backward stroke, the faster the overall forward trend of the magnetic field generator and the material, the shorter the sorting time on the sorting shaking table surface, and the easier it is to bring weakly magnetic and medium magnetic particles into the concentrate product, which is conducive to ensuring the magnetic separation recovery rate.

[0035] When the height of the bed strips is high, the rolling phenomenon is more obvious when the material layer rolls over the bed strips. When the height of the bed strips is low, the rolling phenomenon is weaker. The overall distribution of the bed strips follows the principle of from low to high, gradually improving the concentrate grade. The height setting of the bed strips on the shaking table is adjusted according to the mineral raw materials and mineral processing parameters.

[0036] The present application discloses a self-gravity dry magnetic separation shaking table, which can enhance the separation effect of dry magnetic separation, overcome the dependence of mineral processing technology on water in the western and other water-deficient areas, and realize waterless mineral processing in special mineral processing conditions such as high-purity nickel pyrite preparation, so as to obtain high-quality material products with original surface properties, so as to realize the comprehensive and efficient development and utilization of resources. The equipment makes full use of the difference in the magnetic properties of different materials, replaces the role of flushing water in the traditional water-medium shaking table with a gravity field, and realizes the separation of magnetic materials and non-magnetic materials. At the same time, the raised bed bars are used to replace the grooves of the traditional shaking table, which has realized the tumbling of the material layer, thereby gradually exposing and separating the mixed non-magnetic materials; by controlling the asymmetric stroke movement of the magnetic field generating device, adjusting the stroke and stroke characteristics, etc., the control of separation is realized; by adjusting the magnetic field strength of the magnetic field generating device, the relative size of the magnetic attraction and gravity of the magnetic material is adjusted, and then the separation effect is adjusted.

[0037] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0038] (1) In a traditional water-medium shaking table, the upward surface of the shaking table is the working surface, and the flushing water is used to give the material a force to move laterally on the shaking table surface, and grooves are set on the shaking table surface to achieve rolling, so as to loosen the material, reduce entrainment, and achieve the separation of magnetic materials and non-magnetic materials. In this application, the downward surface of the shaking table is the working surface, and an innovative composite force field composed of magnetism and gravity is used to achieve the separation of magnetic materials and non-magnetic materials, thereby eliminating the water medium and achieving dry separation. The upward magnetic force on the magnetic material is greater than the downward gravity, and it remains adsorbed on the shaking table surface, thereby becoming a concentrate product, while the upward magnetic force on the non-magnetic material is less than the downward gravity, and it will detach from the shaking table surface and fall to become a tailings product.

[0039] (2) Compared with the traditional dry magnetic separation, in the gravity dry magnetic separation shaking table of the present application, the magnetic field generating device will perform an asymmetric stroke motion, driving the material to reciprocate on the shaking table surface equipped with bed bars of different heights, and collide with and climb over the shaking table surface, thereby exposing the magnetic material entrained in the material layer, and quickly detaching from the separation shaking table surface under the action of gravity, thereby improving the sorting accuracy.

[0040] (3) Since there is no water medium and no chemical agents, the gravity dry magnetic separation shaker of the present application can maintain its original surface properties when used to sort special materials, and can purify and obtain high-quality qualified products that maintain their original surface properties.

[0041] (4) The self-gravity dry magnetic separation shaking table of the present application can fully utilize the composite force field formed by the magnetic field and the gravity field to enhance the separation efficiency of magnetic materials and non-magnetic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is the front view of the gravity dry magnetic separation shaker.

[0043] Figure 2 It is the overall schematic diagram of the gravity dry magnetic separation shaker.

[0044] Figure 3 Schematic diagram of the inclination angle between the rocking table surface and the horizontal plane.

[0045] Among them, 1-shaking table surface; 101-feeding area; 102-concentrate area; 2-tailings baffle; 3-tailings receiving funnel; 4-mid-ore bucket; 5-concentrate receiving funnel; 6-concentrate baffle; 7-magnetic field generating device; 8-magnetic device support frame; 9-slide rail; 10-bed bar; 11-support; 12-mobile feeder (not shown); 1201-feeding hopper; 13-driving device. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0047] When dealing with iron-nickel co-existing ores containing pyrrhotite or other magnetic-non-magnetic mixed materials, flotation or wet magnetic separation is usually selected for high-precision separation. However, in arid and water-scarce areas, water resources are particularly precious, and the demand for dry sorting is particularly prominent. Due to the lack of water as a dispersion and sorting medium, the agglomeration and inclusion phenomena of traditional dry magnetic separation are particularly significant, resulting in the sorting accuracy and efficiency being much lower than wet magnetic separation. In addition, in some cases, the addition of water or chemicals will change the original surface properties of the material, affecting the subsequent properties and applications of the material. Overall, there is still a large demand and huge market potential for dry high-precision sorting in the field of material sorting.

[0048] The present application is aware of the urgency and importance of the above-mentioned problems, and the solution is to use a composite force field of a magnetic field and a gravitational field to achieve the separation of magnetic / non-magnetic materials, and through the setting of the asymmetric stroke movement of the magnetic field generating device and the special design of the height of the shaking bed, the rolling and movement of the material layer are achieved, and the entrained non-magnetic materials are exposed to enhance the separation. Finally, the magnetic material and the non-magnetic material can be separated efficiently under anhydrous conditions and maintain good original surface properties.

[0049] Reference Figures 1 to 3 , a self-gravity dry magnetic separation shaking table, comprising a shaking table surface 1;

[0050] A tailings receiving funnel 3 and a concentrate receiving funnel 5 are provided in sequence below the shaking table surface 1, and a concentrate baffle 6 is provided on the lower surface of the shaking table surface 1 close to the concentrate receiving funnel 5, and the concentrate baffle 6 is fixedly connected to the bottom of the shaking table surface 1;

[0051] A magnetic field generating device 7 is provided above the shaking bed surface 1, and the magnetic field generating device 7 is arranged on a magnetic device support frame 8, and the area above the bed surface is a moving area of ​​the magnetic field generating device; the shaking bed surface 1 is relatively stationary, and the magnetic field generating device 7 performs relative reciprocation but moves forward as a whole;

[0052] The lower surface of the rocking bed surface 1 is provided with bed rails 10 of different heights and installed in parallel, and the movement direction of the magnetic field generating device 7 is perpendicular to the installation direction of the bed rails 10 .

[0053] In a specific implementation manner, the lower portion of the shaking table surface 1 is a self-gravity magnetic-gravity separation area;

[0054] In the feeding area 101, the height of the bed strips 10 is relatively small; in the concentrate area 102, the height of the bed strips 10 is relatively large, and the height of the bed strips gradually increases from small to large.

[0055] In a specific implementation manner, an angle θ is formed between the rocking bed surface 1 and the horizontal direction, and 0°<θ<30°.

[0056] In a specific implementation, the rocking bed surface 1 is supported by a plurality of supports 11 .

[0057] In a specific implementation, a mobile feeder 12 is provided on one side of the support 5 .

[0058] In a specific embodiment, the mobile feeder 12 is provided with a feeding hopper 1201, and the feeding hopper 1201 can be moved and rotated to set an inclination angle, so as to facilitate the delivery of the mineral raw materials to the feeding area 101 below the shaking table surface.

[0059] In a specific implementation manner, a middling ore receiving funnel 4 is provided between the tailings receiving funnel 3 and the concentrate receiving funnel 5 .

[0060] In a specific implementation, the magnetic field generating device 7 is a permanent magnet or an electromagnet, and the magnetic field strength can be adjusted to meet the requirements of weak magnetism to strong magnetism.

[0061] In a specific implementation, a slide rail 9 is provided on the magnetic device support frame 8 , and the magnetic field generating device 7 can reciprocate along the slide rail 9 .

[0062] In a specific implementation, a driving device 13 is provided on the side of the rocking bed surface 1 , and the driving device 13 is transmission-connected to the magnetic field generating device 7 .

[0063] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0064] Example 1

[0065] The test sample is pentlandite purchased from Guangxi, in which the grades of Ni, Fe, S and Cu are 2.58%, 14.46%, 7.60% and 1.83% respectively, and the mineral composition is pentlandite, pyrrhotite, chalcopyrite and quartz.

[0066] By adopting the method of dry crushing and screening, 80% of qualified materials with -200 mesh are obtained, and then the self-gravity dry magnetic separation shaking table described in the present application is used for sorting, and the magnetic field strength is adjusted to 0.5T, the stroke is 6cm / s, the stroke is 10c / min, the bed inclination is 30°, and the strip height is 1mm~20mm. Finally, a concentrate product with a Ni grade of 23.65% and a recovery rate of 60.41% and a tailings product with a Ni grade of 1.09% and a recovery rate of 39.59% are obtained.

[0067] Comparative Example 1

[0068] The test sample used in this comparative example 1 is the same as that in the embodiment 1, and its grinding fineness and separation process are also consistent with those in the embodiment.

[0069] In the process of sorting nickel-containing pyrite ore, dry crushing and screening methods are first used to obtain -200 mesh, accounting for 80% of qualified materials, and then a dry magnetic separator is used for sorting. The magnetic field strength is 0.5T and the drum speed is 30r / min. Finally, nickel concentrate products with a Ni grade of 3.60% and a recovery rate of 55.06% and tailings products with a Ni grade of 2.01% and a recovery rate of 44.94% are obtained.

[0070] Example 2

[0071] The test sample is a copper-sulfur mixed concentrate (dry powder) from Northeast China, in which the grades of Cu, S and Fe are 8.04%, 44.58% and 34.32% respectively, and the main mineral components are chalcopyrite, pyrite and pyrrhotite, and the particle size composition is -200 mesh accounting for 78%. The self-gravity dry magnetic separation shaking table described in the present application is used for sorting, and the magnetic field intensity is adjusted to 0.4T, the stroke is 4cm / s, the stroke is 8c / min, the bed surface inclination is 25°, and the strip height is 1mm-20mm. Finally, a copper concentrate product with a Cu grade of 16.21% and a recovery rate of 82.22% and a tailings product with a Cu grade of 2.41% and a recovery rate of 17.78% are obtained.

[0072] Comparative Example 2

[0073] The test sample used in this comparative example 2 is the same as that in Example 2, and its particle size, fineness and separation process are also consistent with those in the example.

[0074] For the copper-sulfur mixed concentrate (chalcopyrite, pyrite and pyrrhotite coexist), a dry magnetic separator was used for sorting. The magnetic field strength was 0.4T and the drum speed was 30r / min. Finally, a copper concentrate product with a Cu grade of 12.36% and a recovery rate of 58.13% and a tailings product with a Cu grade of 5.41% and a recovery rate of 41.87% were obtained.

[0075] Example 3

[0076] The test sample is an iron ore from Inner Mongolia, in which TFe, CaO, MgO and SiO 2The grades are 30.80%, 2.45%, 1.80% and 49.95% respectively, and the main mineral components are magnetite, quartz and amphibole. The ore is dry-crushed to -200 mesh, accounting for 70%, and then the self-gravity dry magnetic separation shaking table described in this application is used for primary sorting, and the magnetic field strength is adjusted to 0.45T, the stroke is 5cm / s, the number of strokes is 10c / min, the bed surface inclination is 28°, and the strip height is 1mm-20mm; the obtained concentrate product is dry-crushed to -400 mesh, accounting for 85%, and then the self-gravity dry magnetic separation shaking table described in this application is used for secondary sorting, and the magnetic field strength is adjusted to 0.45T, the stroke is 4cm / s, the number of strokes is 8c / min, the bed surface inclination is 25°, and the strip height is 1mm-20mm, and finally an iron concentrate product with an Fe grade of 60.32% and a recovery rate of 90.29% is obtained.

[0077] Comparative Example 3

[0078] The test sample used in this comparative example 3 is the same as that in Example 3, and its crushing fineness and separation process are also consistent with those in Example 3. In the magnetite ore sorting process, a dry crushing and screening method is first used to obtain -200 mesh accounting for 70% of qualified materials, and then a dry magnetic separator is used for primary sorting, the magnetic field strength is 0.45T, and the drum speed is 30r / min; the obtained concentrate product is subjected to secondary dry crushing to -400 mesh accounting for 85%, and then a dry magnetic drum is used for secondary sorting, the magnetic field strength is adjusted to 0.45T, and the drum speed is 25r / min, and finally an iron concentrate product with an Fe grade of 55.32% and a recovery rate of 86.29% is obtained.

[0079] The above content is only a specific implementation case of the present application, not all application cases of the present application. All solutions based on the technical ideas of the present application and modifications to the technical ideas of the present application are within the protection scope of the claims of the present application.

Claims

1. A dry magnetic-gravity combined separation process for magnetic materials, characterized in that: include: The magnetic materials are crushed and screened in sequence to obtain qualified materials with a predetermined fineness; The qualified materials are separated by a gravity dry magnetic separation shaker to obtain magnetic minerals and tailings products; The self-gravity dry magnetic separation shaking table comprises a shaking table surface (1); A tailings receiving funnel (3) and a concentrate receiving funnel (5) are sequentially arranged below the shaking table surface (1); a concentrate baffle (6) is arranged on the lower surface of the shaking table surface (1) close to the concentrate receiving funnel (5); and the concentrate baffle (6) is fixedly connected to the bottom of the shaking table surface (1); A magnetic field generating device (7) is provided above the rocking bed surface (1), and the magnetic field generating device (7) is arranged on a magnetic device support frame (8), and the area above the bed surface is a moving area of ​​the magnetic field generating device; the rocking bed surface (1) is relatively stationary, and the magnetic field generating device (7) performs relative reciprocating but overall forward movement; The lower surface of the rocking bed is provided with bed bars (10) of different heights and installed in parallel, and the moving direction of the magnetic field generating device (7) is perpendicular to the installation direction of the bed bars (10).

2. A dry magnetic-gravity combined separation process for magnetic materials according to claim 1, characterized in that: Below the shaking table surface (1) is a self-gravity magnetic-gravity separation area; In the feeding area (101), the height of the bed strips (10) is relatively small; In the concentrate area (102), the height of the bed strips (10) is relatively large, and the height of the bed strips gradually increases from small to large.

3. The dry magnetic-gravity separation process of magnetic materials according to claim 1, characterized in that: The height of the bed strip (10) is 0.5 mm to 20 mm.

4. The dry magnetic-gravity combined separation process of magnetic materials according to claim 1, characterized in that: The rocking table surface (1) has an angle θ with the horizontal direction, 0°<θ<30°.

5. The dry magnetic-gravity combined separation process of magnetic materials according to claim 1, characterized in that: The shaking table surface (1) is supported by a plurality of supports (11), and a mobile feeder (12) is provided on one side of the support (5).

6. The dry magnetic-gravity combined separation process of magnetic materials according to claim 1, characterized in that: The magnetic field generating device (7) is a permanent magnet or an electromagnet.

7. A dry magnetic-gravity combined separation process for magnetic materials according to claim 6, characterized in that: The asymmetric stroke motion of the magnetic field generating device (7) is 1 to 15 cm / s, the stroke frequency is 1 to 20 c / min, and the magnetic field intensity is 0.1 to 1.0 T.

8. The dry magnetic-gravity combined separation process for magnetic materials according to claim 1, characterized in that: The magnetic device support frame (8) is provided with a slide rail (9), and the magnetic field generating device (7) can perform reciprocating motion along the slide rail (9).

9. A dry magnetic-gravity combined separation process for magnetic materials according to claim 8, characterized in that: A driving device (13) is provided on the side of the rocking bed surface (1), and the driving device (13) is transmission-connected to the magnetic field generating device (7).

10. A dry magnetic-gravity combined separation process for magnetic materials according to claim 1, characterized in that: After crushing and screening, qualified materials with a size of -200 mesh accounting for 80% are obtained.

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