Pneumatic magnetic flotation column equipment

Abstract

The invention relates to the technical field of magnetic flotation columns, and discloses pneumatic magnetic flotation column equipment which comprises a magnet exciting coil fixedly connected to the periphery of an inner cylinder. An outer cylinder is arranged on the periphery of the excitation coil; the bottom of the inner cylinder is fixedly connected with a conical concentrator; a feeder is arranged at the middle-upper part of the inner cylinder; an air hole is formed in the equipment, and the other end of the air hole is connected with an air source for generating air bubbles in the equipment; and the pulsation air-entrapping device is arranged outside the outer cylinder and used for providing an air source, and the pulsation control device controls the airflow of the air source, so that the bubble generating device forms pulsation bubbles in the equipment, and the height of the ore pulp liquid level generates pulsation change. The problem that the flotation operation is affected due to the fact that a flotation reagent is diluted through flushing water is solved, the problem that the index of metal ores with large density such as maghemite, pyrrhotite and titanomagnetite is low is also solved, meanwhile, the problems of'ore pulp running out of a groove 'and'black ore running out of the groove' are solved, the one-machine multi-section flotation technology is achieved, and the product recovery rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic flotation columns, and particularly to a pneumatic magnetic flotation column device. Background Art

[0002] With the rise of new high-efficiency columnar electromagnetic and gravity ore dressing equipment represented by elutriation magnetic separators, the electromagnetic and gravity beneficiation technologies and processes for magnetic iron minerals have been widely popularized and applied. Compared with drum magnetic separators, under the same feed conditions and recovery rates, the concentrate grade can be significantly improved. In some cases, it can completely replace the magnetite reverse flotation process. However, when the elutriation magnetic separator is applied to situations such as magnetite, pyrrhotite, and titanomagnetite, due to the reduced differences in the magnetism and density of mineral particles, the effect of separating minerals solely relying on magnetic and gravity differences will be affected. The iron minerals in the ore are associated with a variety of other minerals, including silicate minerals such as quartz and serpentine, as well as sulfide minerals such as chalcopyrite, pyrite, and galena. In special cases, even if the concentrate grade of the elutriation magnetic separator is very high, due to the excessive content of individual harmful impurities affecting product sales, it may even be necessary to add a flotation process to remove the impurities.

[0003] Traditional flotation methods mainly use two types of flotation machines (columns) with mechanical stirring devices and non-stirring bubble flotation columns. The separation of valuable minerals and useless gangue minerals is achieved by using flotation foam to adhere to hydrophobic granular minerals and separate them from the pulp surface and recover the foam. To improve the flotation effect, generally, a turbulently floating area and a static separation area that are physically isolated from each other are constructed in the flotation cell. In the turbulently floating area, a large number of microbubbles are formed through intense turbulence to achieve rapid and sufficient mineralization. In the static separation area, a certain thickness of flotation foam layer needs to be maintained to separate the foam from the pulp. The formation and bursting of the flotation foam layer is a dynamic process. The bubbles float up with a certain thickness of pulp layer, gradually aggregate and interfere with each other when reaching the foam layer, and continue to rise at a certain speed after separating from the pulp surface. At the same time, during the upward floating and separation of the mineralized bubbles from the pulp surface, the dehydration of the foam layer, bubble coalescence, and fragmentation reduce the gas-liquid interface, and the unadhered or weakly adhered mineral particles fall and return to the pulp, resulting in the enrichment of a large amount of target minerals under the pulp surface and being unable to be recovered in time, leading to low mineral flotation rate and recovery rate.

[0004] The prior art develops a magnetic flotation column by adding an air supply device and flotation reagents on the basis of a elutriation magnetic separator (or magnetic separation column, hereinafter collectively referred to as elutriation magnetic separator), hoping to achieve the magnetic and flotation composite separation process thereby. Since the elutriation magnetic separator requires flushing water and the tailings concentration is low (less than 5%), while flotation requires a certain concentration of reagents, and the water dilutes the reagents, which affects flotation. Not only the reagents are wasted, but the flotation effect is not good; similarly, there are also problems with the floating-magnetic composite separation method formed by directly adding an excitation coil on the basis of the flotation column. According to the existing flotation principle, to ensure the stable upward movement of mineralized bubbles, a low-turbulence environment is required in the static separation area of the flotation column. The increase in the air inflow is limited, the momentum of the particulate matter in the pulp is small, the probability of collision between ore particles and bubbles is low, the coarse particulate matter is not easily suspended, and there are not enough bubbles for secondary adhesion after falling off the bubbles, resulting in low flotation recovery. The size of the pulp air inflow directly affects the flotation time, reagent dosage and flotation index. So far, such magnetic flotation columns have not been successfully applied in the market.

[0005] Traditional flotation equipment needs to construct a turbulent flotation area and a static separation area that are physically isolated from each other. The static separation area needs to form a clear pulp-foam interface and a stable foam layer with a certain thickness. Technologically, not only the pulp flow needs to be stable, but also the relationship between the particle movement speed and the particle suspension-collision needs to be considered. At the same time, considering the particle attachment-detachment relationship, the cross-sectional gas flow velocity cannot be too high and the bubble diameter cannot be too large. These restrictions not only restrict the flotation rate and intensity, but also limit the particle size range of mineral flotation. The flotation effect of coarse-grained particles and fine-grained particles will be significantly worse. The hydrocyclone static microbubble flotation column, which is widely used in the coal preparation industry, is difficult to be used in the iron ore dressing of large density and high hardness due to its structure. The hydrocyclone static microbubble flotation column generally uses the middlings at the bottom of the column as the circulating pulp to form a turbulent flotation area, and the thickness of the foam layer in the static separation area needs to be controlled with a margin. The circulation of the bottom middlings affects the feeding amount of the external new ore. In order to improve the equipment throughput, it is necessary to increase the volume and height of the flotation column. This not only increases the number of equipment and space occupation, but also greatly increases the energy consumption. Summary of the Invention

[0006] To solve the technical problems and deficiencies in the above-mentioned background art, the present invention provides a pneumatic magnetic flotation column device, including:

[0007] An inner cylinder 10, and an excitation coil 20 is fixedly connected to the periphery of the inner cylinder 10;

[0008] An outer cylinder 50 is arranged on the periphery of the excitation coil 20;

[0009] A conical concentrator 70 is fixedly connected to the bottom of the inner cylinder 10;

[0010] A feeder 30 is arranged in the upper middle part of the inner cylinder 10;

[0011] The bubble generating device has air holes provided inside the equipment, and the other end is connected to an air source for generating bubbles inside the equipment.

[0012] The pulsating gas adding device is arranged outside the outer cylinder 50 for providing an air source, and includes: a high-pressure air source 41 and a pulsation control device 42; the high-pressure air source 41 is connected to the pulsation control device 42 through an air delivery pipeline.

[0013] The pulsation control device 42 controls the air flow of the air source, so that the bubble generating device forms pulsating bubbles inside the equipment, causing the height of the pulp liquid level in the inner cylinder 10 to change pulsatingly.

[0014] Further, the bubble generating device includes a first bubble generator group 14, which is inserted and fixed in the middle and lower part of the side wall of the equipment. The air holes are arranged inside the inner cylinder 10, and the other end is connected to the air source outside the equipment.

[0015] The first bubble generator group 14 includes a number of first bubble generators 141, which are arranged equidistantly from high to low, and the distance of the air holes from the axis of the inner cylinder 10 increases in sequence.

[0016] There are several groups of the first bubble generator group 14, which are distributed equiangularly along the axis of the inner cylinder 10.

[0017] Further, the bubble generating device includes a second bubble generator group 15, which is inserted and fixed on the side wall of the conical concentrator 70. The air holes are arranged at the bottom of the inner cylinder 10, and the other end is connected to the air source outside the side wall of the conical concentrator 70.

[0018] The second bubble generator group 15 includes a number of second bubble generators 151, and the air holes are arranged radially along the inner cylinder 10.

[0019] There are several groups of the second bubble generator group 15, which are distributed equiangularly along the axis of the inner cylinder 10.

[0020] Further, the bubble generating device includes a third bubble generator group 16;

[0021] The third bubble generator group 16 is arranged below the discharge port of the feeder 30 at the axis of the inner cylinder 10 and is fixedly connected to the fixed bracket 301, and includes: an air chamber 161 and a third bubble generator 162;

[0022] The third bubble generator 162 is inserted and fixed on the side wall of the air chamber 161. The air holes of the third bubble generator 162 are arranged outside the air chamber 161, and the other end is arranged inside the air chamber 161.

[0023] The air chamber 161 is communicated with the outlet of the air inlet pipe 431, and the air inlet pipe 43 is communicated with the air source;

[0024] There are several third bubble generators 162, which are evenly distributed at equal angles along the axis of the air chamber 161;

[0025] There are several air chambers 161, which are arranged from high to low along the axis of the inner cylinder 10. The air holes of the third bubble generators 162 at the higher positions are closer to the axis of the inner cylinder 10, and the air holes of the third bubble generators 162 at the lower positions are farther from the axis of the inner cylinder 10.

[0026] Furthermore, the bubble generating device includes a fourth bubble generator group 17, which is inserted and fixed on the side wall of the conical concentrator 70. The air holes are arranged inside the conical concentrator 70, and the other end is connected to a gas source outside the side wall of the conical concentrator 70;

[0027] The fourth bubble generator group 17 includes several fourth bubble generators 171; the fourth bubble generators 171 form an angle of 15 degrees to 90 degrees with the surface of the side wall of the conical concentrator 70, and the air holes are arranged radially along the conical concentrator 70;

[0028] There are several groups of the fourth bubble generator group 17, which are evenly distributed at equal angles along the axis of the conical concentrator 70.

[0029] Furthermore, it further includes a fifth bubble generator group;

[0030] The fifth bubble generator group includes a middlings pipe 801, a middlings circulation pump 802, a discharge pipe 803, a jet bubble generator 804 and a middlings inlet pipe 805 that are fixedly connected in sequence;

[0031] The jet bubble generator 804 is inserted and fixed in the middle and lower part of the side wall of the equipment. The outlet is arranged inside the inner cylinder 10 of the equipment, and the other end is fixedly connected to the outlet of the middlings circulation pump 802 outside the equipment through the discharge pipe 803;

[0032] The middlings pipe 801 is inserted and fixed in the middle and lower part of the side wall of the equipment below the jet bubble generator 804. One end is arranged inside the inner cylinder 10 of the equipment, and the other end is fixedly connected to the inlet of the middlings circulation pump 802 outside the equipment;

[0033] The discharge pipe 803 is connected to several jet bubble generators 804;

[0034] Several jet bubble generators 804 are evenly distributed along the circumference on the inner cylinder 10;

[0035] There are several fifth bubble generator groups, and each fifth bubble generator group is connected to several jet bubble generators 804;

[0036] The jet bubble generator 804 is a Venturi tube jet bubble generator;

[0037] The middle ore pipe 801 is located 500 to 5000 mm below the jet bubble generator 804;

[0038] One end of the middle ore inlet pipe 805 is internally connected to the jet bubble generator 804 to generate bubbles, and the other end is connected to the atmosphere through a valve. It relies on the jet negative pressure of the jet bubble generator 804 to suck in gas, or is connected to the high-pressure gas source 41 through a valve to inject high-pressure air into the interior of the jet bubble generator 804, or is connected to the pulsation control device 42 through a valve to supply pulsating gas to the interior of the jet bubble generator 804.

[0039] Furthermore, it further includes a bubble cutter 60;

[0040] The bubble cutter 60 is used to control the diameter of the floating bubbles and stabilize the overflow surface. It is arranged inside the inner cylinder 10, above the bubble generating device, and is coaxial with the inner cylinder 10;

[0041] The height of the bubble cutter 60 is 50 to 5000 mm;

[0042] There are several bubble cutters 60, which are installed coaxially with the inner cylinder 10 from low to high;

[0043] There are several through holes on the bubble cutter 60.

[0044] Furthermore, the pulsation control device 42 includes:

[0045] The inlet end of the pulsation control device is connected to the high-pressure gas source 41 through a gas pipe;

[0046] An automatic regulating valve 44, one end of which is connected to the inlet end of the pulsation control device, and the other end is connected to an automatic on-off valve 45;

[0047] The other end of the automatic on-off valve 45 is connected to the outlet end of the pulsation control device;

[0048] A high-pressure gas source electric control valve 46, which is connected to the high-pressure gas source 41.

[0049] Furthermore, it further includes:

[0050] The top of the inner cylinder 10 is fixedly connected with an inverted frustum 12. The inverted frustum 12 is a structure with an equal cross-section or a structure whose cross-section gradually expands from bottom to top, or a combined structure of the structure with an equal cross-section and the structure whose cross-section gradually expands from bottom to top; The top of the inverted frustum 12 is fixedly connected with an overflow weir 13, and an overflow trough 131 is fixedly connected to the periphery of the overflow weir 13. An overflow port 132 is opened on one side of the overflow trough 131.

[0051] Furthermore, it further includes:

[0052] The bottom of the conical concentrator 70 is fixedly connected with a concentrate regulating valve 701;

[0053] The bottom cone angle of the conical concentrator 70 is 15 degrees to 135 degrees;

[0054] An electromagnetic control box is fixedly connected to the upper part of the outer wall of the outer cylinder 50, and the electromagnetic control box is electrically connected to the excitation coil 20;

[0055] The excitation coil 20 is in multiple groups, and the multiple groups of excitation coils 20 are powered on and off according to a certain rule to generate a pulsating magnetic field with a downward direction;

[0056] The device further includes a master controller, which is arranged outside the outer cylinder 50 and electrically connected to the electric control mechanism for controlling each electric control mechanism of the device;

[0057] The electric control mechanism includes: an electromagnetic control box, a high-pressure air source electric control valve 46, a middling recycling pump 802, a pulsation control device 42, and a concentrate regulating valve 701;

[0058] The master controller controls the excitation coil 20 to generate a pulsating magnetic field with a downward direction according to a pulsation preset period, guiding the strongly magnetic mineral particles to settle downward and the weakly magnetic mineral particles to overflow upward;

[0059] The pulsating gas adding device generates pulsating bubbles according to a pulsation preset period;

[0060] The pulsating bubbles are synchronized with the period of the pulsating magnetic field;

[0061] Wherein, 0.1 s ≤ pulsation preset period ≤ 30 s;

[0062] The first to fifth bubble generator groups can be used alone or in combination to realize the coordinated operation of continuous foaming and pulsating gas adding foaming.

[0063] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0064] The present invention proposes to provide pulsating air flow into the magnetic flotation column device through a pulsating gas adding device, increasing the aeration amount of the pulp and making the pulp fluid pulsate upward, so as to produce a "surge effect" on the pulp liquid level in the magnetic flotation column cavity. This is not only beneficial to the bubbles carrying hydrophobic mineral particles, but also enables various impurities to be discharged into the overflow tank as tailings more and faster, improving the grade and separation efficiency of iron concentrate. The upper bubble generator and the bottom bubble generating device complete two bubble mineralization processes in different zones, and for the first time propose a scheme for multiple mineralization processes in the flotation process, which can realize a multi-stage flotation process with one machine.

[0065] The present invention proposes a full-dynamic flotation automatic control that realizes the synchronous operation of "pulsating air flow + bottom bubbles + excitation magnetic field + pulp hydrodynamics control" under the control of a master controller. Under the control of the master controller, the excitation magnetic field and the pulsating air flow pulsate synchronously in opposite directions, superimposing the bottom microbubble flotation process and pulp hydrodynamics control means, achieving a perfect combination of pneumatic flotation and elutriation magnetic separation. The synchronously reverse-changing magnetic field force on the strongly magnetic mineral particles in the pulp cancels out the upward impact force of the pulsating pulp fluid, inhibiting the entry of magnetic particles into the tailings overflow when the pulp liquid level rises. This not only saves inhibitors such as starch and the cost of heating the pulp, but also facilitates the enrichment of non-magnetic mineral particles, lean intergrowths, and easily floatable harmful impurities + bubbles into the pulp liquid level area. Various impurities overflow into the tailings in the form of pulp and / or foam. The present invention does not require a foam tank and a foam scraping device, does not require a foam layer of a certain thickness and a stable gas-liquid cross-section, and automatically controls the synchronous reverse pulsation process of the excitation magnetic field and the pulsating air flow, solving the problems of "pulp running out of the tank" in flotation columns (machines) and "black ore overflow and ore running" in elutriation magnetic separators, improving the product recovery rate, and simplifying the operation difficulty of the equipment.

[0066] The present invention uses the technology of the reverse action of pulsating air flow and magnetic field to solve the problems existing in the ordinary flotation-magnetic composite beneficiation process. The ability of the magnetic field to inhibit the overflow of magnetic minerals is much higher than that of flotation inhibitors such as starch, especially the consumption of heating the pulp. It not only saves costs but also can strengthen the flotation effect by increasing the air inflow. The pulsating air flow replaces the flushing water of the elutriation magnetic separator to push the pulp to pulsate, enhancing the magnetic and gravity beneficiation effects. The "pulp surge effect" generated by the pulsating air flow replaces the function of using flushing water to overflow tailings in ordinary elutriation magnetic separators or magnetic separation columns, solving the problem that the flushing water dilutes the flotation reagents and affects the flotation operation, and also solving the problem that the separation indexes of using a flotation column or a magnetic separation column alone for relatively dense metal ores such as magnetite, pyrrhotite, and titanomagnetite are low.

[0067] The present invention can be used in multiple ways. It can be used alone as an elutriation magnetic separator or a flotation column, or as a composite magnetic flotation column. Especially in water-scarce areas, using compressed air as the power to replace the flushing water to achieve magnetic and gravity beneficiation of the elutriation magnetic separator can greatly reduce the consumption of water and electricity and the volume of tailings. It saves the equipment investment cost, reduces the occupation of equipment sites, improves the beneficiation efficiency, and is also conducive to discarding coarse-grained gangue. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0069] Figure 1 It is a schematic external view of a partial structure of a pneumatic magnetic flotation column device provided by an embodiment of the present invention;

[0070] Figure 2 It is a schematic internal view of a pneumatic magnetic flotation column device provided by an embodiment of the present invention;

[0071] Figure 3 It is a schematic installation view of the first bubble generator group provided by an embodiment of the present invention;

[0072] Figure 4 It is a schematic installation view of the second bubble generator group provided by an embodiment of the present invention;

[0073] Figure 5 It is a schematic view of the structure of another pneumatic magnetic flotation column device provided by an embodiment of the present invention;

[0074] Figure 6 It is a schematic installation view of the third bubble generator group provided by an embodiment of the present invention;

[0075] Figure 7 It is a schematic view of a partial structure of another pneumatic magnetic flotation column device provided by an embodiment of the present invention;

[0076] Figure 8 It is a schematic installation view of the bubble cutter provided by an embodiment of the present invention.

[0077] Reference numerals:

[0078] 10, inner cylinder; 12, inverted frustum; 13, overflow weir; 131, overflow trough; 132, overflow port; 14, first bubble generator group; 141, first bubble generator; 15, second bubble generator group; 151, second bubble generator; 16, third bubble generator group; 161, air chamber; 162, third bubble generator; 17, fourth bubble generator group; 171, fourth bubble generator; 20, excitation coil; 30, feeder; 301, fixed bracket; 41, high-pressure gas source; 42, pulsation control device; 43, intake pipe; 431, intake pipe outlet; 44, automatic regulating valve; 45, automatic on-off valve; 46, high-pressure gas source electric control valve; 50, outer cylinder; 60, bubble cutter; 70, conical concentrator; 701, concentrate regulating valve; 801, middlings pipe; 802, middlings circulation pump; 803, discharge pipe; 804, jet bubble generator; 805, middlings intake pipe. Detailed implementation manners

[0079] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0080] Embodiment:

[0081] Please refer to the attached Figures 1 to 8 , this embodiment provides a pneumatic magnetic flotation column device, including an inner cylinder 10, an excitation coil 20, an outer cylinder 50, a feeder 30, a conical concentrator 70, a bubble generating device, and a pulsating gas adding device.

[0082] The outer periphery of the inner cylinder 10 is fixedly connected with an excitation coil 20; an outer cylinder 50 is arranged outside the excitation coil 20; the bottom of the inner cylinder 10 is fixedly connected with a conical concentrator 70; a feeder 30 is arranged in the upper middle part of the inner cylinder 10.

[0083] The inner cylinder 10 serves as a pulp separation cylinder to realize mineral separation; the excitation coil 20 applies a magnetic force to the magnetic minerals in the inner cylinder 10; the feeder 30 is arranged in the upper middle part of the inner cylinder 10, and after the reagent and the pulp are mixed, they enter the magnetic flotation column device through the feeder 30.

[0084] The bubble generating device has air holes arranged inside the device, and the other end is connected to a gas source to generate bubbles inside the device.

[0085] The pulsating gas adding device is arranged outside the outer cylinder 50 to provide a gas source, and includes: a high-pressure gas source 41 and a pulsating control device 42; the high-pressure gas source 41 is connected to the pulsating control device 42 through a gas transmission pipeline.

[0086] The high-pressure gas source 41 is used to provide a gas source airflow, and the pulsating control device 42 controls the gas source airflow to enable the bubble generating device to form pulsating bubbles inside the device, causing the height of the pulp liquid level in the inner cylinder 10 to change pulsatingly.

[0087] The beneficial effects of this embodiment are as follows: non-magnetic (or weakly magnetic) impurities and easily floating ore particles are allowed to overflow together with the mineralized bubble aggregates in the form of a gas-liquid-solid three-phase mixture. The equipment can actually form an overflow area, a pneumatic separation area, a turbulent flotation area, and a concentrate concentration area. The pulsating gas injection device can provide pulsating air flow inside the magnetic flotation column equipment to form a pneumatic separation area. A large number of bubbles are generated by the bubble generating device as the power for the slurry pulsation, causing a surge effect on the slurry liquid level in the overflow area. In the pneumatic separation area, a large number of newly generated bubbles produced by the bubble generating device collide with the slurry fed into the outlet of the feeder to complete the first collision and adhesion of the hydrophobic ore particles. At the same time, the upward thrust generated promotes the floating and overflow of weakly magnetic, non-magnetic, and hydrophobic ore particles. After being mixed with the slurry, the reagent enters the inner cylinder of the equipment through the feeder and spreads out. The pulsating gas injection device generates a large number of bubbles. Strongly magnetic minerals and hydrophilic ore particles settle to the bottom of the inner cylinder under the action of downward magnetic force and gravity, overcoming the upward pulsating slurry thrust and the buoyancy of the rising bubbles to become concentrate. Weakly magnetic, non-magnetic, and hydrophobic ore particles are affected by the upward pulsating slurry thrust and the buoyancy of the rising bubbles, overcome the gravity, and quickly overflow from the upper end of the inner cylinder to become tailings, ensuring the separation effect of the pneumatic magnetic flotation column equipment on mineral flotation impurities.

[0088] Preferably, please refer to the attached Figure 2 、 3 , the bubble generating device includes a first bubble generator group 14, which is fixedly inserted in the middle and lower part of the side wall of the equipment. The air holes are arranged inside the inner cylinder 10, and the other end is connected to the air source outside the equipment;

[0089] The first bubble generator group 14 includes several first bubble generators 141, which are arranged at equal intervals from high to low, and the distance of the air holes from the axis of the inner cylinder 10 increases in sequence;

[0090] There are several groups of the first bubble generator group 14, which are distributed at equal angles along the axis of the inner cylinder 10 or as required.

[0091] Preferably, please refer to the attached Figure 2 、 4 、5, the bubble generating device includes a second bubble generator group 15, which is fixedly inserted in the side wall of the conical concentrator 70. The air holes are arranged at the bottom of the inner cylinder 10, and the other end is connected to the air source outside the side wall of the conical concentrator 70;

[0092] The second bubble generator group 15 includes several second bubble generators 151, and the air holes are arranged radially along the inner cylinder 10; there are several groups of the second bubble generator group 15, which are distributed at equal angles along the axis of the inner cylinder 10 or as required.

[0093] The second bubble generators 151 form a turbulent flotation area, generating bubbles for the first collision with the slurry. Hydrophobic ore particles that did not collide and fall off from the bubbles during the adhesion process undergo a second collision and adhesion. And then they float up into the pneumatic separation area.

[0094] Preferably, the second bubble generator 151 is perpendicular to the ground, and the bubbles collide with the pulp in a countercurrent manner. The insertion depth of the second bubble generator 151 can be adjusted.

[0095] Under the action of gravity and magnetic force, the strongly magnetic ore particles overcome the impact of the pulsating pulp flow and the buoyancy of the bubbles and enter the concentration area of the conical concentrator 70. According to the density difference of the ore particles, the high-density iron concentrate and low-density tailing particles will be further separated. The low-density light tailings float on the top and will return to the turbulent flotation area under the action of the bubbles generated by the second bubble generator 151. The high-density iron concentrate sinks downward and is discharged through the concentrate regulating valve 701 to become the concentrate product.

[0096] Preferably, please refer to Atta Figure 5 、 6 、7, the bubble generating device includes a third bubble generator group 16;

[0097] The third bubble generator group 16 is arranged at the lower part of the discharge port of the feeder 30 at the axis of the inner cylinder 10 and is fixedly connected to the fixed bracket 301, and includes: an air chamber 161 and a third bubble generator 162;

[0098] The third bubble generator 162 is inserted and fixed on the side wall of the air chamber 161. The air holes of the third bubble generator 162 are arranged outside the air chamber 161, and the other end is arranged inside the air chamber 161;

[0099] The air chamber 161 is communicated with the outlet 431 of the air inlet pipe, and the air inlet pipe 43 is communicated with the air source;

[0100] There are several third bubble generators 162, which are equally angularly distributed along the axis of the air chamber 161; several third bubble generators 162 are arranged staggeredly or oppositely, so that the bubbles are discharged in multiple different directions, providing the discharge efficiency of the bubbles.

[0101] There are several air chambers 161, which are arranged from high to low along the axial direction of the inner cylinder 10. The air holes of the third bubble generator 162 at the high level are close to the axis of the inner cylinder 10, and the air holes of the third bubble generator 162 at the low level are far from the axis of the inner cylinder 10. The air outlet holes of the third bubble generators 162 connected to each independent air chamber 161 are on the same horizontal plane, ensuring the uniformity or hierarchy of the bubbles.

[0102] Preferably, please refer to Atta Figure 7 , the bubble generating device includes a fourth bubble generator group 17, which is inserted and fixed on the side wall of the conical concentrator 70, the air holes are arranged inside the conical concentrator 70, and the other end is connected to the air source outside the side wall of the conical concentrator 70;

[0103] The fourth bubble generator group 17 includes a number of fourth bubble generators 171; the fourth bubble generators 171 form an angle of 15 to 90 degrees with the side wall surface of the conical concentrator 70, and the air holes are arranged radially along the conical concentrator 70;

[0104] There are several groups of the fourth bubble generator group 17, which are equally angularly distributed along the axis of the conical concentrator 70.

[0105] Under the action of gravity and magnetic force, the strongly magnetic ore particles overcome the impact force of the pulsating pulp flow and the buoyancy of the bubbles and enter the concentration area of the conical concentrator 70. According to the density difference of the ore particles, the high-density iron concentrate and low-density tailings particles will be further separated. The low-density light tailings float on the top and will return to the turbulent floating separation area under the action of the bubbles generated by the fourth bubble generator group 17. The high-density iron concentrate sinks downward and is discharged through the concentrate regulating valve 701 to become the concentrate product.

[0106] Preferably, please refer to the attached Figure 7 , the pneumatic magnetic flotation column device further includes a fifth bubble generator group;

[0107] The fifth bubble generator group includes a middlings pipe 801, a middlings circulation pump 802, a discharge pipe 803, a jet bubble generator 804 and a middlings inlet pipe 805 that are fixedly connected in sequence;

[0108] The jet bubble generator 804 is inserted and fixed in the middle and lower part of the side wall of the device, the outlet is arranged inside the inner cylinder 10 of the device, and the other end is fixedly connected to the outlet of the middlings circulation pump 802 outside the device through the discharge pipe 803;

[0109] The middlings pipe 801 is inserted and fixed in the middle and lower part of the side wall of the device below the jet bubble generator 804, one end is arranged inside the inner cylinder 10 of the device, and the other end is fixedly connected to the inlet of the middlings circulation pump 802 outside the device;

[0110] The discharge pipe 803 is connected to a number of jet bubble generators 804;

[0111] A number of jet bubble generators 804 are evenly distributed along the circumference on the inner cylinder 10;

[0112] There are several fifth bubble generator groups, and each fifth bubble generator group is connected to a number of jet bubble generators 804.

[0113] The jet bubble generator 804 is a Venturi tube jet bubble generator.

[0114] The middlings pipe 801 is located 500 to 5000 mm below the jet bubble generator 804.

[0115] One end of the middlings inlet pipe 805 is internally connected to the jet bubble generator 804 for generating bubbles, and the other end is connected to the atmosphere through a valve. It relies on the jet negative pressure of the jet bubble generator 804 to suck in gas, or is connected to the high-pressure gas source 41 through a valve to press high-pressure air into the interior of the jet bubble generator 804, or is connected to the pulsation control device 42 through a valve to supply pulsating gas to the interior of the jet bubble generator 804.

[0116] The middlings circulating pump 802 pumps out the middlings in the inner cylinder of the flotation column equipment and pressurizes and conveys them to the jet bubble generator 804. Inside the jet bubble generator 804, the high-pressure pulp flow shears the gas into tiny bubbles and evenly disperses these bubbles into the pulp in the inner cylinder 10 through the jet action. The middlings inlet pipe 805 connected to the gas source adds gas into the inner cylinder 10 through the jet bubble generator 804, enhancing the interaction between the bubbles and the mineral particles. The hydrophobic mineral particles float to the top of the inner cylinder 10 driven by the bubbles and form mineralized foam that overflows; while the hydrophilic mineral particles sink to the bottom of the inner cylinder 10 and enter the conical concentrator 70 for concentration treatment. It is discharged through the discharge port of the concentrate regulating valve 701.

[0117] Preferably, for the above-mentioned bubble generator, the depth at which the air outlet hole is inserted into the inner cylinder 10 can be adjusted.

[0118] According to different ore properties, the above-mentioned bubble generator can be a Venturi tube, an aeration head, an air injection gun, a microbubble generator, etc. The air outlet direction can be adjusted, and the amount of bubbles can be adjusted by changing the air intake or using the number of branches. Preferably, the air outlet hole is set horizontally or upward.

[0119] Optionally, some of the above-mentioned bubble generators can be installed 10 - 100 mm below the discharge port of the feeder 30, which is beneficial to increasing the opportunity for bubbles to capture hydrophobic particles.

[0120] The above-mentioned bubble generator or bubble generator group can be used alone or in combination as needed to achieve the coordinated operation of continuous foaming and pulsating gas injection foaming. When the bubble generator or bubble generator group is connected to the high-pressure gas source 41, continuous bubbles are generated by the bubble generator to maintain the flotation process. When the bubble generator or bubble generator group is connected to the pulsation control device 42, the bubble generator generates a large number of pulsating bubbles as the power for the pulp pulsation, causing a surge effect on the pulp liquid level in the overflow tank 131.

[0121] Preferably, in addition to being able to be connected to the high-pressure gas source 41 or the pulsation control device 42 through a valve at one end, the middlings inlet pipe 805 can also be directly connected to the atmosphere, relying on the jet negative pressure of the jet bubble generator 804 to suck in gas for continuous foaming, saving power consumption.

[0122] Preferably, please refer to the appendix Figure 2 、 5, 8, the pneumatic magnetic flotation column equipment further includes a bubble cutter 60;

[0123] The bubble cutter 60 is used to control the size of the diameter of the floating bubbles and stabilize the overflow surface. It is arranged inside the inner cylinder 10, above the bubble generating device, and coaxial with the inner cylinder 10. The bubble cutter 60 ensures the stability of the diameter of the floating bubbles and avoids the diameter of the floating bubbles being too large or too small.

[0124] Optionally, the height of the bubble cutter 60 is 50 to 5000 mm;

[0125] Optionally, there are several bubble cutters 60, which are installed coaxially with the inner cylinder 10 from low to high;

[0126] Optionally, there are several through holes on the bubble cutter 60.

[0127] Preferably, please refer to the appendix Figure 2 , 5 , the pulsation control device 42 includes:

[0128] The inlet end of the pulsation control device is connected to the high-pressure gas source 41 through a gas pipe;

[0129] An automatic regulating valve 44, one end of which is connected to the inlet end of the pulsation control device, and the other end is connected to an automatic on-off valve 45; the automatic regulating valve 44 is used to control the gas flow rate. By adjusting the opening degree of the automatic regulating valve 44, the flow rate of the air flow when "connected" can be changed, thereby controlling the pulsation period and the rising amplitude of the pulp liquid level in the flotation column.

[0130] Furthermore, adjusting the opening degree of the automatic regulating valve 44, the magnetic field strength, and the aeration volume can change the grade of the concentrate and tailings and the beneficiation index.

[0131] The other end of the automatic on-off valve 45 is connected to the outlet end of the pulsation control device; the automatic on-off valve 45 is used to connect or disconnect the air flow supply.

[0132] A high-pressure gas source electric control valve 46, which is connected to the high-pressure gas source 41 and is used to control the gas flow rate of one-way air supply.

[0133] The pulsation control device 42 controls the pulsation period and the rising amplitude of the pulp liquid level of the flotation column equipment. While a large number of bubbles generated under the control of the pulsation control device 42 adsorb the hydrophobic particles and float up, the volume of the bubbles expands, causing the pulp liquid level in the flotation column equipment to rise.

[0134] Preferably, please refer to the appendix Figure 1 , 2 , the pneumatic magnetic flotation column equipment further includes:

[0135] At the top of the inner cylinder 10, an inverted frustum 12 is fixedly connected. The inverted frustum 12 has a constant cross-section structure, or a structure with a cross-section gradually expanding from bottom to top, or a combined structure of a constant cross-section structure and a structure with a cross-section gradually expanding from bottom to top. At the top of the inverted frustum 12, an overflow weir 13 is fixedly connected. An overflow trough 131 is fixedly connected to the periphery of the overflow weir 13, and an overflow port 132 is provided on one side of the overflow trough 131.

[0136] The inner cylinder 10 expands the discharge port of the inner cylinder 10 through the inverted frustum 12. Mineralized bubbles adhere to hydrophobic mineral grains, together with weakly magnetic and non-magnetic minerals that are not adhered and enriched under the overflow liquid surface, and are subjected to the upward pulsating pulp impact force and the upward bubble buoyancy force, overcoming the gravity force and quickly crossing over the overflow weir 13, and converge in the overflow trough 131 and are discharged from the overflow port 132 to become tailings.

[0137] Preferably, please refer to Attached Figure 1 、 2 、5、7, the pneumatic magnetic flotation column device further includes:

[0138] At the bottom of the conical concentrator 70, a concentrate regulating valve 701 is fixedly connected;

[0139] Optionally, the bottom cone angle of the conical concentrator 70 is 15 degrees to 135 degrees.

[0140] The bottom of the inner cylinder 10, the conical concentrator 70 and the concentrate regulating valve 701 form a concentrate concentration area. High-density iron concentrate settles downward and is discharged through the concentrate regulating valve 701 to become a concentrate product.

[0141] On the upper part of the outer wall of the outer cylinder 50, an electromagnetic control box is fixedly connected. The electromagnetic control box is electrically connected to the excitation coil 20;

[0142] The excitation coil 20 is in multiple groups. The multiple groups of excitation coils 20 are energized and de-energized according to a certain rule to generate a pulsating magnetic field with a downward direction;

[0143] The device further includes a master controller, which is arranged outside the outer cylinder 50 and electrically connected to the electric control mechanism, and is used to control each electric control mechanism of the device; the electric control mechanism includes: an electromagnetic control box, a high-pressure air source electric control valve 46, a middlings circulating pump 802, a pulsation control device 42 and a concentrate regulating valve 701.

[0144] Under the control of the master controller, the device realizes the full dynamic flotation automatic control of the synchronous operation of "pulsating air flow + bottom bubbles + excitation magnetic field + pulp hydrodynamics control".

[0145] The master controller controls the excitation coil 20 to generate a pulsating magnetic field with a downward direction according to the pulsation preset period, guiding the strongly magnetic mineral grains to settle downward and the weakly magnetic mineral grains to overflow upward.

[0146] The master controller controls the gas flow rate and the gas flow pulsation period of the pulsating gas adding device to generate pulsating bubbles according to the pulsation preset period.

[0147] The period of the pulsating bubbles is synchronized with that of the pulsating magnetic field;

[0148] Among them, 0.1 s ≤ pulsation preset period ≤ 30 s.

[0149] The on - time of the automatic on - off valve 45 is Ton, and the off - time is Toff. Ton ≥ Toff, and the pulsation preset period (Ton + Toff) ≥ Hf / Vb, where Hf is the height of the inner cylinder and Vb is the upward floating speed of the bubbles. Changing the "on / off" time can change the gas flow pulsation period, and thus control the pulsation period and the rising amplitude of the pulp liquid level in the flotation column.

[0150] The value range of the pulsation preset period is limited between 0.1 second and 30 seconds, which helps to maintain the stability of the system. If the pulsation preset period is too short, it may cause the bubbles not to have enough time to rise to the top liquid level of the inner cylinder 10 when there is a surge peak; while if the period is too long, it may reduce the flotation efficiency. By reasonably setting the on - time Ton and the off - time Toff, the generation and upward floating process of the bubbles can be optimized, thereby improving the flotation efficiency. For example, when the on - time is longer, more bubbles can be generated; while when the off - time is longer, the effect of the pulp surge will be weakened. Since the flotation characteristics of different ores may vary, the ratio of the on - time Ton to the off - time Toff, and the length of the "on / off" pulsation preset period (Ton + Toff) can be adjusted to meet the flotation requirements of different ores. This helps to improve the flexibility and adaptability of the system. By precisely controlling the ratio of the on - time to the off - time and the length of the "on / off" period, the generation and upward floating process of the bubbles can be optimized, thereby improving the flotation efficiency and stability.

[0151] The magnetic field generated by the excitation coil 20 is synchronized with the pulsating action generated by the pulsating gas adding device and is opposite to the buoyancy direction, guiding the strongly magnetic mineral particles to settle downward and the weakly magnetic mineral particles to overflow upward. Specifically, when the pulsating gas flow causes the pulp liquid level to rise, the magnetic field intensity is synchronously increased. Similarly, when the pulsating gas flow causes the pulp liquid level to drop, the magnetic field intensity is synchronously decreased. During the flotation process of magnetic minerals, the reverse magnetic field force attracts the magnetic mineral particles to move downward, making it difficult for them to adsorb on the bubbles and float upward. This can greatly reduce the reagent usage cost and the flotation cost.

[0152] Preferably, a transmitter is installed in the inner cylinder 10, and the transmitter is used to detect the change of pulp concentration at different positions.

[0153] An air-driven magnetic flotation column device provided by the present invention. The pulsating air flow formed by the pulsating control device from the output air flow of the high-pressure air source generates bubbles in the flotation column device, causing the height of the pulp liquid surface to pulsate. At this time, after the reagent is mixed with the pulp, it enters the middle and upper parts of the flotation column device through the feeder and spreads out. The pulsating air adding device generates a large number of bubbles. Under the action of the downward magnetic force and gravity, the strongly magnetic minerals and hydrophilic ore particles overcome the upward pulsating pulp impact force and the upward buoyancy of the rising bubbles and settle to the bottom of the flotation column device to become concentrate. The weakly magnetic, non-magnetic, and hydrophobic minerals are affected by the upward pulsating pulp impact force and the upward buoyancy of the rising bubbles, overcome the gravity, and quickly cross the upper end of the overflow weir and are discharged as tailings, ensuring the separation effect of the air-driven magnetic flotation column device on the flotation impurities of minerals.

[0154] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, then the directional indication also changes accordingly.

[0155] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be a middle element at the same time. When an element is referred to as "connected" to another element, it can be directly connected to the other element or can also be indirectly connected to the other element through a middle element.

[0156] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. The quantity referred to as "several" in the present invention all represents a quantity of 1 or more. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0157] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pneumatic magnetic flotation column device, characterized in that: include: An inner cylinder (10), wherein an excitation coil (20) is fixedly connected to the periphery of the inner cylinder (10); An outer cylinder (50) is disposed on the periphery of the excitation coil (20); A conical concentrator (70) is fixedly connected to the bottom of the inner cylinder (10); A feeder (30) is provided at the upper middle portion of the inner cylinder (10); A bubble generating device, wherein the air hole is arranged inside the device and the other end is connected to an air source for generating bubbles inside the device; A pulsating gas filling device is arranged outside the outer cylinder (50) and is used to provide a gas source, comprising: a high-pressure gas source (41) and a pulsating control device (42); the high-pressure gas source (41) is connected to the pulsating control device (42) via a gas pipeline; The pulsation control device (42) controls the gas source airflow so that the bubble generating device forms pulsating bubbles inside the device, causing the height of the slurry liquid level in the inner cylinder (10) to pulsate.

2. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: The bubble generating device comprises a first bubble generator group (14), which is inserted and fixed in the middle and lower part of the side wall of the device, the air hole is arranged inside the inner cylinder (10), and the other end is connected to the air source outside the device; The first bubble generator group (14) comprises a plurality of first bubble generators (141) which are arranged equidistantly from high to low, and the distances of the air holes from the axis of the inner cylinder (10) are gradually increased; The first bubble generator groups (14) include a plurality of groups, which are distributed at equal angles along the axis of the inner tube (10).

3. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: The bubble generating device comprises a second bubble generator group (15) which is inserted and fixed on the side wall of the conical concentrator (70), the air hole is arranged at the bottom of the inner cylinder (10), and the other end is connected to the air source outside the side wall of the conical concentrator (70); The second bubble generator group (15) comprises a plurality of second bubble generators (151), the air holes of which are arranged radially along the inner cylinder (10); The second bubble generator groups (15) include a plurality of groups, which are distributed at equal angles along the axis of the inner tube (10).

4. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: The bubble generating device comprises a third bubble generator group (16); The third bubble generator group (16) is arranged at the lower part of the discharge port of the feeder (30) at the axis of the inner tube (10), and is fixedly connected to the fixed bracket (301), and comprises: an air chamber (161) and a third bubble generator (162); The third bubble generator (162) is inserted and fixed on the side wall of the air chamber (161), the air hole of the third bubble generator (162) is arranged outside the air chamber (161), and the other end is arranged inside the air chamber (161); The air chamber (161) is in communication with an air inlet pipe outlet (431), and the air inlet pipe (43) is in communication with an air source; There are a plurality of third bubble generators (162) which are distributed at equal angles along the axis of the air chamber (161); There are a plurality of air chambers (161) arranged from high to low along the axial direction of the inner tube (10), the air holes of the third bubble generators (162) at the high position are close to the axis of the inner tube (10), and the air holes of the third bubble generators (162) at the low position are far from the axis of the inner tube (10).

5. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: The bubble generating device comprises a fourth bubble generator group (17) which is inserted and fixed on the side wall of the conical concentrator (70), the air hole is arranged inside the conical concentrator (70), and the other end is connected to the air source outside the side wall of the conical concentrator (70); The fourth bubble generator group (17) comprises a plurality of fourth bubble generators (171); the fourth bubble generators (171) form an angle of 15 to 90 degrees with the side wall surface of the conical concentrator (70), and the air holes are arranged radially along the conical concentrator (70); The fourth bubble generator groups (17) include a plurality of groups, which are distributed at equal angles along the axis of the conical concentrator (70).

6. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: Also included is a fifth bubble generator set; The fifth bubble generator group comprises a middling pipe (801), a middling circulation pump (802), a discharge pipe (803), a jet bubble generator (804) and a middling air inlet pipe (805) which are fixedly connected in sequence; The jet bubble generator (804) is inserted and fixed in the middle and lower part of the side wall of the equipment, the outlet is arranged inside the inner tube (10) of the equipment, and the other end is fixedly connected with the outlet of the intermediate ore circulation pump (802) outside the equipment through the outlet pipe (803); The intermediate ore pipe (801) is inserted and fixed in the lower middle part of the side wall of the equipment and is located below the jet bubble generator (804), one end of which is arranged inside the inner cylinder (10) of the equipment, and the other end is fixedly connected to the feed port of the intermediate ore circulation pump (802) outside the equipment; The discharge pipe (803) is connected to a plurality of jet bubble generators (804); A plurality of the jet bubble generators (804) are evenly distributed along the circumference of the inner cylinder (10); There are a plurality of fifth bubble generator groups, and each fifth bubble generator group is connected to a plurality of jet bubble generators (804); The jet bubble generator (804) is a venturi jet bubble generator; The intermediate ore pipe (801) is located 500 to 5000 mm below the jet bubble generator (804); One end of the intermediate ore air inlet pipe (805) is connected to the interior of the jet bubble generator (804) for generating bubbles, and the other end is connected to the atmosphere through a valve, and relies on the jet negative pressure of the jet bubble generator (804) to inhale gas, or is connected to a high-pressure gas source (41) through a valve to press high-pressure air into the interior of the jet bubble generator (804), or is connected to a pulsation control device (42) through a valve to provide pulsating gas to the interior of the jet bubble generator (804).

7. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: Also includes a bubble cutter (60); The bubble cutter (60) is used to control the diameter of the floating bubbles and stabilize the overflow surface, and is arranged inside the inner cylinder (10) and above the bubble generating device, and is coaxial with the inner cylinder (10); The height of the bubble cutter (60) is 50 to 5000 mm; There are a plurality of bubble cutters (60), which are coaxially installed with the inner cylinder (10) from low to high; The bubble cutter (60) is provided with a plurality of through holes.

8. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: The pulsation control device (42) comprises: The inlet end of the pulsation control device is connected to the high-pressure gas source (41) through an air pipe; An automatic regulating valve (44), one end of which is connected to the inlet of the pulsation control device, and the other end of which is connected to the automatic on-off valve (45); The other end of the automatic on-off valve (45) is connected to the outlet end of the pulsation control device; A high-pressure gas source electrically controlled valve (46) is connected to the high-pressure gas source (41).

9. The pneumatic magnetic flotation column equipment according to claim 1, characterized in that: Also includes: An inverted truncated cone (12) is fixedly connected to the top of the inner cylinder (10); the inverted truncated cone (12) is a structure with a uniform cross section or a structure with a cross section that gradually expands from bottom to top, or a combination of a structure with a uniform cross section and a structure with a cross section that gradually expands from bottom to top; an overflow weir (13) is fixedly connected to the top of the inverted truncated cone (12); an overflow trough (131) is fixedly connected to the periphery of the overflow weir (13); an overflow port (132) is provided on one side of the overflow trough (131).

10. The pneumatic magnetic flotation column device according to any one of claims 2 to 8, characterized in that: Also includes: A concentrate regulating valve (701) is fixedly connected to the bottom of the conical concentrator (70); The bottom cone angle of the conical concentrator (70) is 15 to 135 degrees; An electromagnetic control box is fixedly connected to the upper portion of the outer wall of the outer cylinder (50), and the electromagnetic control box is electrically connected to the excitation coil (20); The excitation coils (20) are multiple groups, and the multiple groups of excitation coils (20) are powered on and off according to a certain rule to generate a pulsating magnetic field with a downward direction; The device also includes a master controller, which is arranged outside the outer cylinder (50) and is electrically connected to the electric control mechanism, and is used to control each electric control mechanism of the device; The electric control mechanism comprises: an electromagnetic control box, a high-pressure gas source electric control valve (46), a middling ore circulation pump (802), a pulsation control device (42) and a concentrate regulating valve (701); The master controller controls the excitation coil (20) to generate a pulsating magnetic field in a downward direction according to a preset pulsating cycle, thereby guiding the strong magnetic mineral particles to settle downward and the weak magnetic mineral particles to overflow upward; The pulsating gas adding device generates pulsating bubbles according to a preset pulsating cycle; The pulsating bubbles are synchronized with the period of the pulsating magnetic field; Among them, 0.1s≤pulsation preset period≤30s; The first to fifth bubble generator groups can be used individually or in combination to achieve the coordinated operation of continuous foaming and pulsating aeration foaming.

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