Magnetic attraction lining and double-medium energy-saving ore grinding system and using method thereof

Abstract

The invention discloses a magnetic attraction lining and double-medium energy-saving ore grinding system and a using method thereof.The magnetic attraction lining and double-medium energy-saving ore grinding system comprises an ore feeding opening, an overflow type mill barrel, a magnetic attraction lining, double grinding media, a hollow shaft neck and an anti-spiral blade; the sealing ring is tightly attached to the overflow type mill cylinder by means of magnetic force; double grinding media are arranged in the overflow type mill cylinder and are used for grinding minerals; a hollow shaft neck is arranged at one end part of the overflow type mill cylinder body and is used for discharging mineral products; and an ore feeding opening is formed in the other end part of the overflow type mill barrel body and is used for guiding a sand setting product of the hydraulic classification cyclone to enter the overflow type mill barrel body. Through the multi-layer and multi-link fine design, the whole ore grinding process is more efficient and accurate, and the utilization rate and the production efficiency of mineral resources are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a magnetic lining and dual-medium energy-saving grinding system and a use method thereof. Background Art

[0002] In the field of mineral processing, the cylinder lining and grinding media are important parts that affect the production capacity of the mill. In the production of the beneficiation plant, the cost of grinding operation accounts for about 30-40% of the total cost, which is mainly reflected in the energy consumption and medium consumption of the mill. Therefore, from the perspective of production importance and economic benefits, it is of great practical significance to study and improve the grinding method, the material and structural shape of the lining of the mill cylinder, and the material shape and gradation of the grinding media to reduce the beneficiation cost and ensure the separation index. At present, most magnetite beneficiation plants still use overflow ball mills composed of traditional manganese steel liners and steel media in fine grinding operations. The combined liner wears quickly, has high energy consumption and medium consumption, and is not conducive to the cost management of the beneficiation plant. To this end, in view of the shortcomings of the prior art, the present invention provides a magnetic lining and dual-medium energy-saving grinding system and a method of using the same, which is intended to improve the productivity and grinding efficiency of the mill and reduce the cost of grinding operations while ensuring the fineness of the grinding product.

[0003] Therefore, the applicant, based on many years of rich experience in design, development and actual production in the relevant industry, has conducted research and improvements on the existing structures and deficiencies, and provided a magnetic lining and dual-media energy-saving grinding system and its use method, in order to achieve a more practical purpose. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a magnetic lining and dual-medium energy-saving grinding system and a method of using the same, which solves the problem that most magnetite beneficiation plants currently still use overflow ball mills that combine traditional manganese steel liners and steel media for fine grinding operations. The combined liner wears quickly, has high energy and medium consumption, and is not conducive to cost management of the beneficiation plant.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention implements a magnetic liner and dual-medium energy-saving grinding system through the following technical scheme, including a feed port, an overflow mill cylinder, a magnetic liner, dual grinding media, a hollow shaft neck and reverse spiral blades, the overflow mill cylinder has a certain curvature, the magnetic liner is magnetic as a whole, and is tightly attached to the overflow mill cylinder by magnetic force; the overflow mill cylinder is provided with dual grinding media for grinding minerals; one end of the overflow mill cylinder is provided with a hollow shaft neck for discharging mineral products; the other end of the overflow mill cylinder is provided with a feed port, which is used to guide the sand settling product of the hydraulic classification cyclone into the overflow mill cylinder; reverse spiral blades are arranged on the above-mentioned hollow shaft neck, and the direction of rotation of these blades during the grinding operation is opposite to the rotation direction of the overflow mill cylinder.

[0008] Preferably, the magnetic lining is a groove body with a rectangular front and a certain curvature on the back, so that it can be closely attached to the inner wall of the overflow mill cylinder through magnetic force;

[0009] The interior of the tank is further subdivided into multiple areas of equal size, and a steel ball with a specific diameter is fixed in the center of each area.

[0010] Preferably, the dual grinding media is a mixture of ferrous and non-ferrous spherical media, the ferrous spherical grinding media is a hot-rolled steel ball, and the non-ferrous spherical grinding media is an alumina ceramic ball.

[0011] Furthermore, the diameter of the overflow mill is 1 to 1.2 times that of the overflow mill using a manganese steel liner as a mill cylinder protection component and iron balls as grinding media, and the length of the overflow mill is the same as that of the overflow mill using a manganese steel liner as a mill cylinder protection component and iron balls as grinding media.

[0012] Preferably, the reverse spiral blades are used to intercept materials whose density and particle size do not meet the standards, and then send them back to the overflow mill cylinder along the spiral trajectory for re-grinding.

[0013] Preferably, the outlet end of the hollow shaft neck may be equipped with a ore discharge interception net to further enhance the interception effect.

[0014] Preferably, the filling rate of the dual grinding media in the overflow mill cylinder is 40-43%; when the diameter of the ferrous spherical grinding media is 30 mm, the non-ferrous spherical grinding media may include three diameters of 30 mm, 25 mm, and 20 mm.

[0015] Further, the gradation of the ferrous spherical grinding media and the non-ferrous spherical grinding media is

[0016] φ30mm steel ball: φ30mm ceramic ball: φ25mm ceramic ball: φ20mm ceramic ball = 43~48%: 8~13%: 30~35%: 8~13%.

[0017] Furthermore, before the overflow ball mill equipped with a magnetic lining is officially put into production, steel balls of a certain mass and diameter are added therein. The steel balls are adsorbed on the surface of the lining by magnetic force, and can form a grid-like protective layer with the steel balls in multiple areas of the same size in the magnetic lining tank, thereby preventing the grinding medium and the material from directly contacting the lining surface and causing wear, while enhancing the lifting effect of the grinding medium.

[0018] A method for using a magnetic lining and dual-medium energy-saving grinding system, including the magnetic lining and dual-medium energy-saving grinding system, including a three-stage closed-circuit grinding system, a classification system and a weak magnetic separation system, specifically including the following steps:

[0019] S1: Make pulp from the minerals with a particle size less than 3 mm to be separated and transport them to the first grinding and classification operation pump pool;

[0020] S2: The slurry in the pump pool obtained in S1 is fed into the slurry pump, and the pressure-stabilizing pump is sent to a hydrocyclone group for a stage of classification to obtain overflow and sand settling products;

[0021] S3: The sediment obtained in S2 is fed to a first-stage grinding mill by gravity to carry out a first-stage grinding operation. The grinding product flows by gravity into a first-stage grinding and grading operation pump pool in S1 to repeat S2, forming a closed circuit;

[0022] S4: The overflow from S2 is fed to the first magnetic separator by gravity flow for a weak magnetic separation operation. The magnetically separated concentrate flows into the second-stage grinding and grading operation pump pool through a pipeline;

[0023] S5: The slurry in the pump pool obtained in S4 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the second-stage hydrocyclone group for two-stage classification operation to obtain overflow and sand settling products;

[0024] S6: The sediment obtained in S5 is fed to the second-stage mill by gravity to carry out the second-stage grinding operation. The grinding product flows by gravity into the second-stage grinding and classification operation pump pool in S4 to repeat S5, forming a closed circuit;

[0025] S7: The overflow obtained in S5 is fed to the second-stage magnetic separator by gravity flow to perform the second-stage weak magnetic separation operation, and the magnetically separated concentrate flows into the third-stage grinding and classification operation pump pool through the pipeline;

[0026] S8: The slurry in the pump pool obtained in S7 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the three-stage hydrocyclone group for three-stage classification operation to obtain overflow and sand settling products;

[0027] S9: The sediment obtained in S8 is fed into the three-stage mill by gravity to perform three-stage grinding operation. The grinding product flows into the three-stage grinding and classification operation pump pool in S7 by gravity to repeat S8, forming a closed circuit;

[0028] S10: Feed the overflow obtained in S8 into a three-stage magnetic separator to perform three-stage weak magnetic separation operations to obtain a three-stage magnetic separation concentrate;

[0029] S11: The first magnetic separation tailings obtained in S4, the second magnetic separation tailings obtained in S7 and the third magnetic separation tailings obtained in S10 are combined to obtain the final grinding tailings.

[0030] Furthermore, the three-stage closed-circuit grinding system comprises: a first-stage grinding using a grate ball mill, a second-stage grinding using an overflow ball mill, and a third-stage grinding using a tower mill;

[0031] Furthermore, in the steps S1, S4 and S7, the pump pool for the grinding and classification operation is provided with water to adjust the slurry concentration.

[0032] Furthermore, the second-stage grinding operation in step S6 utilizes a magnetic lining and a dual-medium energy-saving grinding system.

[0033] (III) Beneficial effects

[0034] The present invention provides a magnetic lining and dual-medium energy-saving grinding system and a method of using the same. It has the following beneficial effects:

[0035] (1) The formation of a magnetic grid lining is beneficial to increase the service life of the liner, enhance the lifting effect on the grinding medium, reduce the downtime of the ball mill for replacing parts, and improve the mill operation rate and energy transfer efficiency;

[0036] (2) Adding a certain amount of iron grinding media, adopting a reasonable media grading system and filling rate, effectively reducing the gaps between the media, ensuring the effective crushing of minerals, and making up for the deficiency of ceramic balls that lead to coarse second-stage grinding of minerals due to their light density;

[0037] (3) The use of magnetic lining and double grinding media in grinding reduces the medium consumption and energy consumption of the second-stage grinding operation, improves the grinding efficiency, and is beneficial to the cost management of the magnetite concentrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a magnetic lining and dual-medium energy-saving grinding system;

[0039] Figure 2 The process flow chart of the application of magnetic lining and dual-media energy-saving grinding system;

[0040] Figure 3 It is composed of the particle size of the second-stage cyclone sand settling product and the φ4060 overflow ball mill discharge product;

[0041] Figure 4 It is composed of the particle size of the second-stage cyclone sand settling product and the φ3660 overflow ball mill discharge product;

[0042] In the figure: 1. Feed port, 2. Overflow mill cylinder, 3. Magnetic lining, 4. Double grinding media, 5. Hollow shaft neck, 6. Counter-spiral blades. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1 The present invention provides a technical solution: a magnetic liner and dual-medium energy-saving grinding system, comprising a feed port 1, an overflow mill cylinder 2, a magnetic liner 3, dual grinding media 4, a hollow shaft neck 5 and reverse spiral blades 6, the overflow mill cylinder 2 has a certain curvature, the magnetic liner 3 is magnetic as a whole, and is tightly attached to the overflow mill cylinder 2 by magnetic force; the overflow mill cylinder 2 is provided with dual grinding media 4 for grinding minerals; a hollow shaft neck 5 is provided at one end of the overflow mill cylinder 2 for discharging mineral products; a feed port 1 is provided at the other end of the overflow mill cylinder 2, and the feed port 1 is used to guide the sand settling product of the hydraulic classification cyclone into the overflow mill cylinder 2; reverse spiral blades 6 are arranged on the above-mentioned hollow shaft neck 5, and the direction of rotation of these blades in the grinding operation is opposite to the rotation direction of the overflow mill cylinder 2.

[0045] The magnetic lining 3 is a groove body with a rectangular front surface and a certain curvature on the back surface, and the curvature is so as to be closely attached to the inner wall of the overflow mill cylinder 2 by magnetic force;

[0046] The interior of the tank is further subdivided into multiple areas of equal size, and a steel ball with a specific diameter is fixed in the center of each area.

[0047] The double grinding media 4 is a mixture of ferrous and non-ferrous spherical media. The ferrous spherical grinding media are hot-rolled steel balls, and the non-ferrous spherical grinding media are alumina ceramic balls.

[0048] The diameter of the overflow mill is 1 to 1.2 times that of the overflow mill with manganese steel liner as the mill cylinder protection component and iron balls as the grinding medium. The length of the overflow mill is the same as that of the overflow mill with manganese steel liner as the mill cylinder protection component and iron balls as the grinding medium.

[0049] The reverse spiral blade 6 intercepts the materials whose density and particle size do not meet the standards, and then sends them back to the overflow mill cylinder 2 along the spiral trajectory for re-grinding.

[0050] The outlet end of the hollow shaft neck 5 can be equipped with a ore discharge interception net to further enhance the interception effect.

[0051] The filling rate of the double grinding media 4 in the overflow mill cylinder 2 is 40-43%; when the diameter of the iron spherical grinding media is 30 mm, the non-iron spherical grinding media can include three diameters of 30 mm, 25 mm, and 20 mm.

[0052] The gradation of ferrous spherical grinding media and non-ferrous spherical grinding media is

[0053] φ30mm steel ball: φ30mm ceramic ball: φ25mm ceramic ball: φ20mm ceramic ball = 43~48%: 8~13%: 30~35%: 8~13%.

[0054] Before the overflow ball mill equipped with a magnetic lining is put into formal production, steel balls of a certain mass and diameter are added into it. The steel balls are adsorbed on the surface of the lining by magnetic force, forming a grid-like protective layer with the steel balls in multiple areas of the same size in the magnetic lining tank, preventing the grinding medium and the material from directly contacting the lining surface and causing wear, while enhancing the lifting effect of the grinding medium.

[0055] A method for using a magnetic lining and dual-medium energy-saving grinding system includes a magnetic lining and dual-medium energy-saving grinding system, including a three-stage closed-circuit grinding system, a classification system and a weak magnetic separation system, specifically including the following steps:

[0056] S1: Make pulp from the minerals with a particle size less than 3 mm to be separated and transport them to the first grinding and classification operation pump pool;

[0057] S2: The slurry in the pump pool obtained in S1 is fed into the slurry pump, and the pressure-stabilizing pump is sent to a hydrocyclone group for a stage of classification to obtain overflow and sand settling products;

[0058] S3: The sediment obtained in S2 is fed to a first-stage grinding mill by gravity to carry out a first-stage grinding operation. The grinding product flows by gravity into a first-stage grinding and grading operation pump pool in S1 to repeat S2, forming a closed circuit;

[0059] S4: The overflow from S2 is fed to the first magnetic separator by gravity flow for a weak magnetic separation operation. The magnetically separated concentrate flows into the second-stage grinding and grading operation pump pool through a pipeline;

[0060] S5: The slurry in the pump pool obtained in S4 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the second-stage hydrocyclone group for two-stage classification operation to obtain overflow and sand settling products;

[0061] S6: The sediment obtained in S5 is fed to the second-stage mill by gravity to carry out the second-stage grinding operation. The grinding product flows by gravity into the second-stage grinding and classification operation pump pool in S4 to repeat S5, forming a closed circuit;

[0062] S7: The overflow obtained in S5 is fed to the second-stage magnetic separator by gravity flow to perform the second-stage weak magnetic separation operation, and the magnetically separated concentrate flows into the third-stage grinding and classification operation pump pool through the pipeline;

[0063] S8: The slurry in the pump pool obtained in S7 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the three-stage hydrocyclone group for three-stage classification operation to obtain overflow and sand settling products;

[0064] S9: The sediment obtained in S8 is fed into the three-stage mill by gravity to perform three-stage grinding operation. The grinding product flows into the three-stage grinding and classification operation pump pool in S7 by gravity to repeat S8, forming a closed circuit;

[0065] S10: Feed the overflow obtained in S8 into a three-stage magnetic separator to perform three-stage weak magnetic separation operations to obtain a three-stage magnetic separation concentrate;

[0066] S11: The first magnetic separation tailings obtained in S4, the second magnetic separation tailings obtained in S7 and the third magnetic separation tailings obtained in S10 are combined to obtain the final grinding tailings.

[0067] The three-stage closed-circuit grinding system is: the first stage grinding uses a grate ball mill, the second stage grinding uses an overflow ball mill, and the third stage grinding uses a tower mill;

[0068] In steps S1, S4 and S7, the grinding and grading operation pump pool is set to add water to adjust the slurry concentration.

[0069] The second stage grinding operation in step S6 utilizes a magnetic lining and a dual-media energy-saving grinding system.

[0070] During operation, the feed port 1 guides the sand settling products of the hydraulic classification cyclone into the φ4060 overflow mill cylinder 2, on which the magnetic lining 3 is tightly arranged. Under the action of the double grinding media 4, the minerals are crushed; the mineral products to be discharged from the ball mill are discharged through the hollow shaft neck 5, on which the reverse spiral blades 6 are installed; during the grinding process, the rotation direction of the reverse spiral blades 6 is opposite to the rotation direction of the mill cylinder to ensure that the grinding media mixed in the ball mill discharge products and some unqualified particle materials with high density and coarse particle size are blocked and returned to the mill cylinder along the spiral line for re-grinding; in addition, the outlet end of the hollow shaft neck 5 is also equipped with a discharge interception net to further enhance the interception effect.

[0071] For examples, see Figure 3 , an ultra-lean magnetite beneficiation plant, the raw ore is crushed in three stages and in a closed circuit → high-pressure roller mill closed circuit crushing → wet pre-selection and discarding, and the -3mm wet pre-selection coarse concentrate enters the selection operation.

[0072] The production sequence adopts a method for using a magnetic lining and dual-media energy-saving grinding system. The specific implementation steps are as described in the technical plan. The first stage grinding adopts a φ3660 grid ball mill, the second stage grinding adopts a φ4060 overflow ball mill, and the third stage grinding adopts a TGTM-1000 tower mill. The second stage grinding operation uses a magnetic lining and dual-media energy-saving grinding system (such as the attached Figure 1 The process is as follows:

[0073] The sand settling products of the second-stage cyclone obtained in step S5 of the technical solution are collected in the sand settling box and enter the φ4060 overflow mill cylinder 2 through the ore feed port 1. The cylinder 2 is tightly covered with a magnetic lining 3. Under the action of the double grinding media 4, the minerals are crushed; the mineral products to be discharged from the ball mill are discharged through the hollow shaft neck 5, which is equipped with a reverse spiral blade 6; during the grinding process, the rotation direction of the reverse spiral blade 6 is opposite to the rotation direction of the mill cylinder to ensure that the grinding media mixed in the ball mill discharge product and some unqualified particle materials with high density and coarse particle size are blocked and returned to the mill cylinder along the spiral line for re-grinding; in addition, the outlet end of the hollow shaft neck 5 is also equipped with a discharge interception net to further enhance the interception effect.

[0074] Before installing the magnetic lining and entering the production sequence, add 10t φ20mm steel balls into the φ4060 overflow ball mill and operate the ball mill at a low speed. The φ20mm steel balls will be adsorbed on the surface of the liner by the magnetic force to form a protective layer.

[0075] The medium filling rate of the φ4060 overflow ball mill is 41%, and the gradation of ferrous and non-ferrous spherical grinding media is φ30mm steel ball: φ30mm ceramic ball: φ25mm ceramic ball: φ20mm ceramic ball = 45%: 11%: 33%: 11%.

[0076] For comparison, see Figure 4 , when the same ore dressing plant as in the embodiment, another production sequence system flow in the operation is selected, as shown in the attached Figure 2 As shown, the difference from the embodiment is that

[0077] The second stage grinding adopts φ3660 overflow ball mill, the mill lining adopts manganese steel lining plate, the grinding medium is single iron spherical object, the medium filling rate is 37%, and the medium gradation is φ50mm steel ball: φ30mm steel ball: φ25mm steel ball = 40%: 30%: 30%.

[0078] Under the same production operating conditions and production technical index requirements, the grinding efficiency of the embodiment is higher than that of the comparative example. -0.074mm The mill operating current increased by 4.4%, and the mill operating current decreased by 68A, saving 56.67%.

[0079] In summary, the formation of a magnetic grid lining is conducive to increasing the service life of the lining, enhancing the lifting effect of the grinding media, reducing the downtime of the ball mill for replacing parts, and improving the mill operation rate and energy transfer efficiency. Adding a certain amount of iron grinding media, adopting a reasonable media grading system and filling rate, effectively reducing the gaps between the media, ensuring the effective crushing of minerals, and making up for the lack of coarseness of the second-stage grinding fineness of the ceramic ball due to its own light density. The use of magnetic lining and double grinding media in combination with grinding reduces the medium consumption and energy consumption of the second-stage grinding operation, improves the grinding efficiency, and is beneficial to the cost management of the magnetite beneficiation plant. Through this multi-level and multi-link fine design, the entire grinding process is more efficient and accurate, greatly improving the utilization rate and production efficiency of mineral resources.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic liner and dual-medium energy-saving grinding system, comprising a feed port (1), an overflow mill cylinder (2), a magnetic liner (3), dual grinding media (4), a hollow shaft neck (5) and reverse spiral blades (6), characterized in that: The overflow mill cylinder (2) has a certain curvature, and the magnetic lining (3) is magnetic as a whole and is tightly attached to the overflow mill cylinder (2) by magnetic force; the overflow mill cylinder (2) is provided with double grinding media (4) for grinding minerals; one end of the overflow mill cylinder (2) is provided with a hollow shaft neck (5) for discharging mineral products; the other end of the overflow mill cylinder (2) is provided with a feed port (1), and the feed port (1) is used to guide the sand settling product of the hydraulic classification cyclone into the overflow mill cylinder (2); the hollow shaft neck (5) is equipped with reverse spiral blades (6), and the direction of rotation of these blades during the grinding operation is opposite to the rotation direction of the overflow mill cylinder (2).

2. A magnetic lining and dual-medium energy-saving grinding system according to claim 1, characterized in that: The magnetic lining (3) is a groove body with a substantially rectangular front surface and a certain curvature on the back surface, and the curvature allows the groove body to be closely attached to the inner wall of the overflow mill cylinder (2) through magnetic force; The interior of the tank is further subdivided into multiple areas of equal size, and a steel ball with a specific diameter is fixed in the center of each area.

3. The magnetic lining and dual-medium energy-saving grinding system according to claim 1 is characterized in that: The double grinding media (4) are a mixture of ferrous and non-ferrous spherical media, wherein the ferrous spherical grinding media are hot-rolled steel balls, and the non-ferrous spherical grinding media are alumina ceramic balls.

4. The magnetic lining and dual-medium energy-saving grinding system according to claim 1 is characterized in that: The reverse spiral blade (6) is used to intercept materials whose density and particle size do not meet the standards, and then send them back to the overflow mill cylinder (2) along the spiral trajectory for re-grinding.

5. The magnetic lining and dual-medium energy-saving grinding system according to claim 1 is characterized in that: The outlet end of the hollow shaft neck (5) can be equipped with a ore discharge interception net, which can further enhance the interception effect.

6. The magnetic lining and dual-medium energy-saving grinding system according to claim 3 is characterized by: The filling rate of the dual grinding media (4) in the overflow mill cylinder (2) is 40-43%; when the diameter of the iron spherical grinding media is 30 mm, the non-iron spherical grinding media may include three diameters of 30 mm, 25 mm, and 20 mm.

7. A method for using a magnetic lining and a dual-medium energy-saving grinding system, characterized in that: The invention comprises a magnetic lining and dual-medium energy-saving grinding system as claimed in claim 1, comprising a three-stage closed-circuit grinding system, a classification system and a weak magnetic separation system, and specifically comprises the following steps: S1: Make pulp from the minerals with a particle size less than 3 mm to be separated and transport them to the first grinding and classification operation pump pool; S2: The slurry in the pump pool obtained in S1 is fed into the slurry pump, and the pressure-stabilizing pump is sent to a hydrocyclone group for a stage of classification to obtain overflow and sand settling products; S3: The sediment obtained in S2 is fed to a first-stage grinding mill by gravity to carry out a first-stage grinding operation. The grinding product flows by gravity into a first-stage grinding and grading operation pump pool in S1 to repeat S2, forming a closed circuit; S4: The overflow from S2 is fed to the first magnetic separator by gravity to perform a weak magnetic separation operation. The magnetically separated concentrate flows into the second-stage grinding and grading operation pump pool through a pipeline; S5: The slurry in the pump pool obtained in S4 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the second-stage hydrocyclone group for two-stage classification operation to obtain overflow and sand settling products; S6: The sediment obtained in S5 is fed to the second-stage mill by gravity to carry out the second-stage grinding operation. The grinding product flows by gravity into the second-stage grinding and classification operation pump pool in S4 to repeat S5, forming a closed circuit; S7: The overflow obtained in S5 is fed to the second-stage magnetic separator by gravity flow to perform the second-stage weak magnetic separation operation, and the magnetically separated concentrate flows into the third-stage grinding and classification operation pump pool through the pipeline; S8: The slurry in the pump pool obtained in S7 is fed into the slurry pump, and the pressure-stabilizing pump is sent to the three-stage hydrocyclone group for three-stage classification operation to obtain overflow and sand settling products; S9: The sediment obtained in S8 is fed into the three-stage mill by gravity to perform three-stage grinding operation. The grinding product flows into the three-stage grinding and classification operation pump pool in S7 by gravity to repeat S8, forming a closed circuit; S10: Feed the overflow obtained in S8 into a three-stage magnetic separator to perform three-stage weak magnetic separation operations to obtain a three-stage magnetic separation concentrate; S11: The first magnetic separation tailings obtained in S4, the second magnetic separation tailings obtained in S7 and the third magnetic separation tailings obtained in S10 are combined to obtain the final grinding tailings.

8. The method for using the magnetic lining and dual-medium energy-saving grinding system according to claim 7 is characterized in that: The three-stage closed-circuit grinding system comprises: a first-stage grinding using a grate ball mill, a second-stage grinding using an overflow ball mill, and a third-stage grinding using a tower mill.

9. The method for using the magnetic lining and dual-medium energy-saving grinding system according to claim 7 is characterized in that: In the steps S1, S4 and S7, the pump pool for the grinding and classification operation is provided with water to adjust the slurry concentration.

10. The method for using the magnetic lining and dual-medium energy-saving grinding system according to claim 7, characterized in that: The second-stage grinding operation in step S6 utilizes a magnetic lining and a dual-medium energy-saving grinding system.

Images