Multi-force field transmission-free double electromagnetic static step dragging coupling negative pressure flotation system

Abstract

The application discloses a multi-force-field transmission-free double-electromagnetic static stepping dragging coupling negative pressure flotation system and belongs to the technical field of mineral separation. The system comprises a fluid force field device, a double-electromagnetic selection device and a negative pressure force field device; an electrostatic system, a heat dissipation system and a selection tank body; and all the force fields are alternately controlled by a PLC. The application is suitable for deep selection of N kinds of deeply embedded and dyed, flat and fine and miscellaneous and difficult ultrafine particle minerals. Through a "1, 2, 2" five-stage combined selection process, the application is especially suitable for deep selection of titanium concentrate in the Panxi region, and can obtain 95% of an intermediate product of an anatase type and 93% of an intermediate product of an iron-rich concentrate, which are respectively used for preparing a 3N-grade anatase type photocatalyst and a 2N nano-grade ferromagnetic wave-absorbing material, so that the resource value is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of mineral sorting technology, specifically targeting a multi-force field combined sorting system for deeply embedded, fine, complex, and difficult-to-sort minerals with ultra-fine particle size. This system achieves efficient separation of ferromagnetic minerals and non-ferromagnetic minerals through the synergistic coupling of fluid force field, electromagnetic force field and negative pressure field, and is particularly suitable for the deep sorting of complex and difficult-to-sort minerals with ultra-fine particle size. Background Technology

[0002] Current Status and Bottlenecks of Mineral Sorting Technology

[0003] Mineral sorting is a core link in the development and utilization of mineral resources, and its technological level directly affects the utilization rate and economic benefits of mineral resources. With the increasing depletion of easily sortable mineral resources, the sorting of deeply distributed, disseminated, fine, complex, and ultrafine-grained minerals has become a major technical challenge facing the mineral processing field.

[0004] Traditional mineral separation technologies mainly include single-force-field separation methods such as gravity separation, magnetic separation, flotation, and electrostatic separation. Gravity separation relies on differences in mineral density and has low separation efficiency for fine-particle minerals; conventional magnetic separation equipment is mainly for coarse-particle strongly magnetic minerals and has insufficient capture capacity for ultrafine-particle weakly magnetic minerals; traditional flotation technology relies on the flotation effect of bubbles, has poor selectivity for intergrowth minerals, and has complex reagent preparation, resulting in significant environmental pollution problems related to minerals.

[0005] Technical challenges in beneficiation of ultrafine-grained minerals

[0006] Deeply woven, inlaid, finely mixed, and ultra-fine-grained minerals have the following characteristics, making their sorting extremely difficult:

[0007] Significant particle size effect: When the mineral particle size enters the ultrafine level, the specific surface area of ​​the particles increases sharply, the surface energy product increases significantly, and non-selective agglomeration of mineral particles is prone to occur, forming a "floc" phenomenon, which seriously interferes with the selectivity of the sorting process.

[0008] Intergrowth dispersion is difficult: In deeply disseminated ores, the relationship between valuable minerals and gangue minerals is complex, and the proportion of intergrowths is high. Traditional mechanical stirring separation equipment relies on shear force to disperse intergrowths, but it is prone to over-grinding and mudding of ultrafine-sized intergrowths, resulting in over-crushing of valuable minerals and a decrease in recovery rate.

[0009] Existing sorting equipment mostly uses a single force field or a simple superposition of force fields. There is a lack of temporal coupling and spatial coordination between the force fields, making it difficult to achieve accurate separation of minerals with complex intergrowth relationships.

[0010] Limitations of existing electromagnetic sorting technology

[0011] Electromagnetic separation technology has unique advantages in the recovery of ferromagnetic minerals, but existing electromagnetic separation equipment has the following shortcomings:

[0012] Complex transmission structure: Traditional electromagnetic sorting equipment mostly uses mechanical transmission methods (such as belt drive, drum rotation, etc.) to realize mineral transportation and sorting. The equipment has a complex structure, high energy consumption, large maintenance requirements, and the transmission components are prone to wear and high failure rate in humid and corrosive mineral slurry environments.

[0013] Uneven magnetic field distribution: The magnetic fields of existing electromagnetic sorting devices are mostly continuous constant magnetic fields or simple alternating magnetic fields. The spatial distribution of the magnetic field is not uniform, making it difficult to effectively capture and directionally drag ultrafine-sized minerals, thus limiting the sorting accuracy.

[0014] Residual magnetism is difficult to remove: After the electromagnet is de-energized, residual magnetism exists, which prevents the adsorbed mineral particles from completely falling off, causing "magnetic agglomeration" and "magnetic blockage", affecting the stability and efficiency of continuous sorting operations.

[0015] Lack of multi-force field coordination: Existing electromagnetic separation equipment usually only uses electromagnetic force fields for separation, without effectively coupling with fluid force fields, negative pressure fields, etc., and lacks effective means for the separation and recovery of non-ferromagnetic minerals.

[0016] Inadequacy of existing flotation technologies

[0017] Traditional flotation technology uses air bubbles as a carrier to separate minerals, but it has the following problems:

[0018] Controlling bubble size is difficult: Conventional flotation machines produce bubbles with a wide size distribution, resulting in low carrying efficiency for ultrafine minerals, and the probability of bubble-particle collision decreases significantly as the particle size decreases.

[0019] High dependence on reagents: The flotation process is highly dependent on chemical reagents such as collectors and frothers. These reagents are expensive, and some of them pollute the mineral environment, resulting in significant wastewater treatment challenges.

[0020] Poor selectivity for intergrowths: Traditional flotation relies mainly on reagent control for selectivity of intergrowths, which is not ideal for separating deeply distributed and disseminated intergrowths, making it difficult to balance concentrate grade and recovery rate.

[0021] Current Status of Negative Pressure Technology in Mineral Sorting

[0022] The application of negative pressure (vacuum) technology in mineral sorting is mainly concentrated in the field of vacuum filtration and dewatering, with limited application in the sorting stage. Some studies have attempted to introduce negative pressure into the sorting process to achieve slurry suction and transportation, but a complete sorting system coupled with electromagnetic and fluid force fields has not yet been formed.

[0023] The Importance of Electrostatic Control in Mineral Sorting

[0024] In dry or semi-dry sorting processes, static electricity can easily accumulate due to friction between mineral particles and between particles and equipment surfaces. This static electricity can lead to non-selective adsorption and agglomeration of mineral particles, interfering with the sorting process. Existing sorting equipment does not adequately address static electricity control and lacks a systematic design for conductive static electricity.

[0025] Special needs of ilmenite beneficiation in the Panxi region

[0026] The Panxi region is my country's largest ilmenite resource base, and its titanium concentrate is characterized by deep dissemination and ultrafine particle size. Current beneficiation processes typically produce titanium concentrates with a TiO2 grade of around 47%, which is insufficient to meet the high purity requirements for raw materials used in the preparation of high-end titanium dioxide, photocatalysts, and ferromagnetic microwave absorbers. Furthermore, the iron resources in ilmenite are not being fully utilized, resulting in resource waste.

[0027] Therefore, developing a transmissionless multi-force field coupling system capable of efficiently separating minerals with deep-weave, inlaid, fine, and complex textures, and with narrow particle sizes of 3-10 μm, is of great practical significance for improving the comprehensive utilization level of ilmenite resources in the Panxi region, extending the industrial chain, and increasing the added value of products. Summary of the Invention

[0028] Purpose of the invention

[0029] The purpose of this invention is to provide a multi-force field, non-transmission, dual-electromagnetic, static stepping drag coupling negative pressure separation system to solve the technical problems in the prior art, such as low separation efficiency for deeply embedded and dyed, flat and fine mixed minerals, low separation efficiency for ultrafine particles, complex equipment structure, high energy consumption, difficulty in dispersing intergrown organisms, incomplete cleaning of residual magnetism, low recovery rate of non-ferromagnetic minerals, and serious electrostatic interference.

[0030] Another objective of this invention is to provide a five-stage combined deep beneficiation process ("1, 2, 2") for 47% titanium concentrate in the Panxi region, which separates the titanium concentrate into high-grade anatase intermediate products and iron-rich concentrate intermediate products, providing high-quality raw materials for downstream preparation of 3N-grade anatase photocatalysts and 2N nanoscale ferromagnetic microwave absorbing materials.

[0031] Technical solution

[0032] To achieve the above objectives, the present invention adopts the following technical solution:

[0033] A multi-force field, non-drive, dual-electromagnetic, static stepping drag coupling negative pressure flotation system includes:

[0034] Fluid force field device

[0035] The fluid force field device includes a front spray plate, a rear spray plate, and left and right side spray plates installed in the separation tank. It is used to form a directional fluid dynamic field in the water medium, promote the movement of minerals, and scour and disperse ultrafine particle size intergrowths to prevent agglomeration and flocculation.

[0036] The front and rear spray plates are positioned opposite each other, with the front spray plate having an elevation angle of 1° and the rear spray plate having a depression angle of 5°. 0 A relatively direct jet flow field is formed in the water medium; the left and right spray plates are symmetrically arranged on both sides of the separation tank, and the spray elevation angle is 1°, forming a relatively semi-atomized wide-angle jet flow field in the water medium.

[0037] The front spray plate, rear spray plate, and left and right side spray plates are all made of conductive modified ultra-high molecular weight polyethylene (UHMW-PE). The conductive modified ultra-high molecular weight polyethylene is composed of conductive carbon powder, short-cut carbon fiber, and a small amount of graphite solid, and has wear-resistant, corrosion-resistant and static-conductive properties.

[0038] Dual electromagnetic separation device

[0039] The dual electromagnetic separation device is time-controlled by a PLC control system, including:

[0040] External electromagnet assembly at the bottom of the separation tank: Installed at the bottom of the separation tank, the electromagnet has a surface magnetic intensity of 4000 Gauss. It is used to generate the electromagnetic force field required for dragging and separation, capture ferromagnetic minerals in the space inside the separation tank and drag them to the bottom of the tank, and then move them backward to the discharge port for discharge.

[0041] In-tank magnetic separation column group: The electromagnet group is perpendicular to the bottom of the tank, and the steel wire magnetic separation column is installed at the bottom of the tank. The steel wire magnetic separation column is paired with the electromagnet group at the bottom of the tank in a one-to-one correspondence to form a dual electromagnetic group coupling structure, which enhances the spatial capture efficiency and spatial magnetic field gradient of ultrafine-sized ferromagnetic minerals.

[0042] The electromagnet assembly at the bottom of the tank adopts a static step-drag working mode, and the following working cycle is achieved by PLC-controlled timing:

[0043] Forward energizing stage: The electromagnet group is forward energized and energized, generating a sorting magnetic field, which magnetically attracts and drags ferromagnetic minerals;

[0044] Buffering and voltage reduction stage: The positive power supply is disconnected, the magnetic field strength is buffered and the voltage is reduced, and the magnetic force on the mineral particles gradually weakens;

[0045] Reverse demagnetization stage: The electrodes are switched and low voltage reverse current is applied to generate a reverse magnetic field, which offsets and cancels the residual magnetism of the electromagnet core;

[0046] Static shedding stage: All power is turned off and the material is left to stand still. Under the action of gravity and fluid force field, the material completely falls off, the magnetic field returns to zero, and one step dragging cycle is completed, which is repeated.

[0047] Negative pressure field device

[0048] The negative pressure field device includes a negative pressure suction vacuum unit and a flotation device, used to suction and discharge non-ferromagnetic minerals.

[0049] The negative pressure suction flotation device includes a vacuum unit, a discharge conveying pump, and a non-ferromagnetic mineral discharge pipe; the tank of the negative pressure suction flotation device is made of conductive modified ultra-high molecular weight polyethylene (UHMW-PE), and a triangular hole screen structure is set inside the tank. The four corners of the inner tank are rounded and there are four triangles with 20μm suction holes. The surface of the triangles is covered with a 20μm pore screen.

[0050] Static electricity control system

[0051] The separation tank is equipped with electrostatic electrodes, which are arranged in pairs with the magnetic separation column. The electrostatic electrodes are connected in series and grounded to eliminate the static electricity accumulation caused by the friction of mineral particles during the separation process and prevent non-selective agglomeration caused by electrostatic adsorption.

[0052] Selection tank

[0053] The sorting tank is a high-silica glass tank, cast in one piece. The tank is 600mm long, 1200mm wide, and 400mm high, with 4mm thick walls and a 3mm thick bottom. The electromagnet assembly is encapsulated in 304 stainless steel resin, providing structural strength, corrosion resistance, and electromagnetic shielding performance.

[0054] The separation tank is equipped with an automatic water level balancing system to maintain the stability of the water medium level in the separation tank.

[0055] Conveying and Discharging System

[0056] The conveying and discharging system includes a conveying trough, a retractable baffle, a non-magnetic mineral discharge pipe, a magnetic mineral discharge port and a magnetic mineral discharge auxiliary wheel, and a recovery trough, to realize the continuous feeding, sorting and classified discharge of mineral materials.

[0057] Multi-force field coupling selection mechanism

[0058] The core innovation of this invention lies in the multi-force field synergistic coupling and selection mechanism of fluid force field, electromagnetic force field and negative pressure field:

[0059] Fluid force field effect: The front spray plate sprays water backward at an elevation angle of 1°, the rear spray plate sprays water forward at a depression angle of 5°, and the left and right spray plates spray water at an elevation angle of 1° respectively, forming a relatively wide-angle semi-atomized jet flow field, together constituting the three-dimensional fluid force field environment within the sorting tank. This fluid force field has the following functions:

[0060] It propels mineral particles to move longitudinally along the tank, enabling continuous conveying of mineral materials;

[0061] It exerts a mild scouring and shearing effect on ultrafine particle size intergrowths, promoting the dispersion of intergrowths and increasing the degree of monomer dissociation;

[0062] To prevent non-selective agglomeration and flocculation of ultrafine-grained minerals due to surface energy concentration;

[0063] It provides an upward buoyancy force to non-ferromagnetic minerals, causing them to spatially separate from ferromagnetic minerals.

[0064] Electromagnetic field effect: The dual electromagnetic group, consisting of the electromagnet assembly outside the tank bottom and the steel wire magnetic separation column inside the tank, forms a high-gradient, step-by-step alternating electromagnetic field under PLC timing control.

[0065] During the forward energization phase, the dual electromagnetic array forms a strong magnetic field capture zone within the separation tank space, generating magnetic adsorption on ferromagnetic minerals.

[0066] In static step-drag mode, the electromagnet group works in zones and times according to the PLC preset time sequence, forming a "virtual magnetic brush" effect that moves ferromagnetic minerals backward along the bottom of the tank, and drags the captured ferromagnetic minerals to the discharge port at the bottom of the tank.

[0067] As a high-gradient magnetic medium, the steel wire magnetic separation column significantly enhances the local magnetic field gradient and increases the spatial capture probability of ultrafine-sized ferromagnetic minerals.

[0068] Negative pressure field effect: The negative pressure suction flotation device forms a negative pressure zone at the top of the separation cell, which generates a suction force on the non-ferromagnetic minerals that float to the surface under the action of the fluid force field, and sucks them out, thus realizing the effective recovery of non-ferromagnetic minerals.

[0069] Multi-force field temporal coupling: PLC control system precisely coordinates the spatiotemporal distribution of various force fields.

[0070] In the front section of the sorting zone, the fluid force field is mainly used for dispersion and transportation, the electromagnetic force field is mainly used for capture, and the negative pressure field is used to maintain the balance of the slurry level in the sorting tank.

[0071] In the middle section of the sorting zone, the fluid force field continuously disperses and transports, the electromagnetic force field mainly drags and moves, and the negative pressure field begins to draw up the non-ferrous magnetic minerals that float to the surface.

[0072] In the latter part of the sorting zone, the electromagnetic field enters the demagnetization and shedding cycle. Ferromagnetic minerals enter the unloading zone and are fed into the unloading port by the auxiliary wheel, then enter the recovery tank. The negative pressure field strengthens the suction of non-ferromagnetic minerals.

[0073] Features of Dual Electromagnetic Static Step-Drag Technology

[0074] Transmission-free design: This invention employs a static stepping dragging method where electromagnetic force directly acts on mineral particles, completely eliminating the mechanical transmission components (such as belts, rollers, chains, etc.) of traditional magnetic separation equipment. This offers the following advantages:

[0075] The equipment structure has been greatly simplified, reducing manufacturing and maintenance costs;

[0076] It eliminates the problems of wear and failure of transmission components in humid and corrosive mineral slurry environments;

[0077] Operating energy consumption is significantly reduced, with no mechanical friction loss;

[0078] It operates with low noise and has a friendly working environment.

[0079] Stepping timing control: The PLC control system divides the electromagnet group into four zones ABCD and executes the four-step cycle of "forward energization - buffer voltage reduction - reverse demagnetization - static detachment" according to the preset timing sequence, forming a capture-drag-release sequence along the downward and backward of the tank, realizing continuous sorting of mineral materials.

[0080] Residual magnetism counteracting elimination: Low-voltage reverse energizing technology is adopted. After the electromagnet is de-energized, a reverse magnetic pole is applied to actively counteract the residual magnetism of the iron core. Combined with the static stage, the magnetic field is completely reduced to zero, which completely solves the problem of residual magnetism blockage in traditional electromagnetic sorting equipment and ensures the stability of continuous operation.

[0081] Dual electromagnetic coupling enhancement: The spatial pairing and arraying of the electromagnet group at the bottom of the tank and the steel wire magnetic separation column inside the tank forms a dual electromagnetic coupling structure, which significantly improves the capture efficiency of ultrafine-sized minerals.

[0082] Beneficial effects of the present invention

[0083] Compared with the prior art, the multi-force field transmission-free dual electromagnetic static stepping drag coupling negative pressure flotation system of the present invention has the following advantages:

[0084] High sorting accuracy: Through precise temporal coupling of fluid force field, electromagnetic force field and negative pressure field, the separation of deep-weave embedded fine and difficult-to-separate ferromagnetic minerals and non-ferromagnetic minerals with ultra-fine particle size is achieved, and the recovery rate of both ferromagnetic and non-ferromagnetic minerals is significantly improved.

[0085] Good dispersion effect on intergrowths: The 1° elevation angle relative to the direct injection and semi-atomized wide-angle injection flow field produces a mild and uniform hydrodynamic dispersion effect on intergrowths, maintains the degree of liberation of useful minerals, and improves the grade of concentrate.

[0086] No transmission, low energy consumption: All mechanical transmission components are eliminated, and the sorting and transportation of minerals are achieved by electromagnetic force acting directly on them. The equipment has a simple structure, low operating energy consumption, low maintenance, and high reliability.

[0087] Thorough removal of residual magnetism: The system employs a four-step timing control process of "forward energization - buffer voltage reduction - reverse demagnetization - static detachment," combined with low-voltage reverse energization to counteract residual magnetism, thereby completely eliminating residual magnetism in the electromagnet core and preventing magnetic agglomeration and blockage.

[0088] Electrostatic interference elimination: The electrostatic conductive electrodes are paired with the magnetic separation column and connected in series with ground to form a systematic electrostatic control system, which effectively eliminates the interference of mineral particle static electricity on the separation process.

[0089] Strong adaptability to ultrafine particle size: The dual electromagnetic coupling high gradient magnetic field has a strong capture ability for ultrafine particle size (including weakly magnetic) minerals, which expands the lower limit of the applicable particle size of electromagnetic separation technology.

[0090] Environmentally friendly: The separation process uses water as the medium, eliminating the need to add flotation reagents and reducing the pollution of minerals and the environment by chemical reagents; the equipment is made of corrosion-resistant and wear-resistant conductive modified ultra-high molecular weight polyethylene and high-silicon glass, with a long service life and no risk of heavy metal leaching.

[0091] High degree of automation: The PLC controls the timing of various force fields, water level balance, heat dissipation, negative pressure suction and other process parameters throughout the process, realizing the automated and intelligent operation of the sorting process. It is easy to operate and has good process stability.

[0092] High value of industrial chain extension: Through the "1, 2, 2" five-stage joint beneficiation process, 47% titanium concentrate in the Panxi region can be deeply separated into 95% anatase intermediate products and 93% iron-rich concentrate intermediate products, providing high-quality raw materials for the downstream preparation of 3N-grade anatase photocatalysts and 2N nanoscale ferromagnetic microwave absorbing materials, thereby significantly enhancing the value of resources. Attached Figure Description

[0093] Figure 1 This is a side cross-sectional diagram of the separation process of a multi-force field, non-drive, dual-electromagnetic static stepping drag coupling negative pressure flotation system.

[0094] In the diagram: 1—Conveying trough; 2—Retractable baffle; 3—High-silica glass tank; 4—Magnetic separation column; 5—Negative pressure suction flotation device; 6—Non-magnetic mineral discharge pipe; 7—Magnetic mineral discharge port; 8—Magnetic mineral recovery tank; 9—PLC-controlled electromagnet; 10—Ferromagnetic material discharge control board; 11—Front spray plate; 12—Rear spray plate; 13—Material pre-selection and homogenization zone.

[0095] Figure 2 This is an aerial view of the separation process of the transmissionless dual electromagnetic static stepping drag coupling negative pressure flotation system of the present invention.

[0096] In the diagram: 1—Conveying trough; 2—Retractable baffle; 3—Automatic water level balancing system for the separation tank; 4—High-silica glass tank, 600mm long, 1200mm wide, 400mm high, with 4mm thick walls and 3mm thick bottom; 5—Magnetic separation column; 6—Negative pressure down-draft flotation device; 7—AC-DC PLC electronic control cabinet; 8—Ferromagnetic discharge baffle; 9—Vacuum unit; 10—Discharge conveying pump; 11—Non-magnetic mineral discharge pipe; 12—Magnetic mineral recovery tank; 13—Material pre-selection and homogenization zone; 14—Front spray plate; 15—Rear spray plate; 16—Front right spray plate; 17—Front left spray plate; 18—Front right spray plate; 19—Front left spray plate; 20—Rear right spray plate; 21—Rear left spray plate; 22—Ferromagnetic mineral auxiliary discharge wheel.

[0097] Figure 3 This is a schematic diagram of a static step-drag dual electromagnetic system.

[0098] In the diagram: 1—Electromagnetic column (steel wire magnetic column), 440mm high, φ2mm; 2—Negative pressure suction flotation device; 3—Electromagnetic assembly (76 pieces), 600mm long, 1092mm wide, 60mm high; 4—Separation tank; 5—Electromagnetic assembly housing (304 stainless steel), 610mm long, 1160mm wide, 61mm high, resin encapsulated.

[0099] Figure 4 Schematic diagram of a continuous selection step-drag electromagnet assembly device.

[0100] In the diagram: 1—Start / Stop Controller (PLC); 2—Infrared Temperature Sensor; 3—Adjustable Pressure Air Refrigeration Unit; 4—≤5℃ Cooling Air Inlet, Pressurization Speed ​​5m / s; 5—Cooling Air Outlet; 6—Electromagnetic Assembly Enclosed in 304 Stainless Steel Housing; 7—Cooling Air Gap; 8—Composite Magnetic Shielding Plate; 9—Forward Power Supply, Excitation Separation, Magnetic Separation of Minerals; 10—Disconnecting Forward Power Supply, Buffering Voltage Reduction; 11—Reversing Electrode Voltage for Low-Voltage Reverse Power Supply, Counteracting Residual Magnetism; 12—Complete Power Off and Static, Mineral Material Falls Off, Magnetic Field Returns to Zero; 13—Electromagnetic Assembly Enclosed in 304 Stainless Steel Housing.

[0101] Figure 5 This is a structural diagram of a single electromagnet.

[0102] In the diagram: 1—Upper base (600mm long, 13mm wide, 10mm high); 2—Lower base (600mm long, 13mm wide, 10mm high); 3—Central column (560mm long, 5mm wide, 40mm high); 4—Plan view of the length of the central column; 5—Cross-sectional view of the height of the central column.

[0103] Figure 6 This is a cross-sectional view of a single electromagnetic component.

[0104] In the diagram: 1—Top base; 2—Bottom base; 3—Central vertical column; 4—Flat copper enameled wire (narrow side 2.00mm, wide side 4.00mm); double-layer winding 10 turns; 5—Heat dissipation gap 1mm; 6—Composite magnetic shielding plate (both sides): pure iron 0.5mm + permalloy 0.51mm + pure iron 0.5mm = 1.5mm, heat dissipation gap 0.5mm; 7—Composite magnetic shielding plate (bottom): pure iron 1mm + permalloy 1mm + pure iron 1mm = 3mm, a 1mm heat dissipation gap is left at the bottom during installation.

[0105] Figure 7 This is a diagram of the magnetic column array for the flotation cell.

[0106] The array has a length of 1092mm × 592mm and a total of 66 individual cells, each cell measuring 100mm × 100mm.

[0107] Figure 8 This is a single-cell magnetic column array diagram in the magnetic column array diagram of the flotation cell.

[0108] The magnetic columns are arranged in a 100mm×100mm range per cell.

[0109] Figure 9 This is a schematic diagram of the middle skeleton of the magnetic separation column array.

[0110] In the diagram: 1—Reinforcing rib in the middle of the magnetic separator column. The magnetic separator column array frame is 1092mm long, 592mm wide, and 440mm high.

[0111] Figure 10 An enlarged view of a single cell containing the magnetic column fixing cover plate at the top of the flotation cell.

[0112] Drill 77 holes with a diameter of φ4mm within a 100mm×100mm area in each cell.

[0113] Figure 11 This is a diagram of an antistatic device.

[0114] In the diagram: 1—Plastic cap; 2—Magnetic post fixing cover; 3—Magnetic post; 4—Conductive electrode.

[0115] Figure 12 It is a negative pressure suction type flotation device.

[0116] Negative pressure suction flotation device, made of conductive modified ultra-high molecular weight polyethylene (UHMW-PE) (conductive carbon powder / chopped carbon fiber, a small amount of graphite solids). 1—Box body: 520mm long, 400mm wide, 200mm high; 2—Non-magnetic mineral discharge outlet; 3—Inner box: rounded corners, 200mm high, consisting of four interconnected triangles covered with 20μm suction holes, with 20μm mesh screens attached to the surface of the triangles.

[0117] Figure 13 This is a diagram showing the layout of the water spray plates in the flotation cell.

[0118] All spray plates are made of conductive modified ultra-high molecular weight polyethylene (UHMW-PE) (conductive carbon powder / short-cut carbon fiber, a small amount of graphite solids). 1—Front spray plate; 2—Left front semi-atomized wide-angle spray plate; 3—Right front semi-atomized wide-angle spray plate; 4—Left front semi-atomized wide-angle spray plate; 5—Right front semi-atomized wide-angle spray plate; 6—Left rear spray plate; 7—Right rear spray plate; 8—Unloading chute.

[0119] Figure 14 This is a structural diagram of the front water spray plate.

[0120] In the diagram: 1—Front panel of the front spray plate; 2—Water channel; 3—Rear panel of the front spray plate.

[0121] Figure 15 This is a schematic diagram of the front water spray plate.

[0122] The front spray plate is 600mm long, 20mm wide, and has a height of 360mm + top thickness of 10mm + bottom thickness of 30mm, with a thickness of 10mm on both the left and right sides. It has 780 0.3mm spray holes. In the figure: 1—front spray plate; 2—water channel; 3—rear spray plate; 4—water inlet pipe.

[0123] Figure 16 This is a schematic diagram of the water spray plates on the left and right sides of the front section of the flotation cell.

[0124] In the diagram: 1—Four spray plates on the left and right sides of the front section. The outer shell of each spray plate has a length of 100mm (flat length) + 2 × 10mm (arc radius) = 120mm, a width of 20mm, and a height of 10mm (top base) + 30mm (bottom base) + 320mm = 360mm; 2—Three triangles are set in the direction of the flat plate, each triangle is equipped with a 0.6mm atomizing wide-angle 110° nozzle; 3—Enlarged view of the triangular nozzle arrangement; 4—Flat plate surface; 5—15 openings on each side of the vertical column of the spray plate with an arc radius of R10°, with 30 equidistant 0.3mm spray holes; 6—Water inlet pipe.

[0125] Figure 17 This is a schematic diagram of the water spray plate behind the flotation cell.

[0126] The rear spray plate is 600mm long, 20mm wide, and 130mm high (110mm + 10mm top thickness + 10mm bottom thickness), with 560 0.3mm spray holes.

[0127] Figure 18 This is a schematic diagram of the water spray plate at the rear of the flotation cell.

[0128] There are two water spray plates on both sides of the rear section. The outer shell of each water spray plate is 120mm long (100mm for the flat plate + 2 × 10mm for the arc) and 190mm high (10mm for the top + 30mm for the bottom + 150mm for the clearance). The water spray plate has 5 openings on each side of the vertical column along the center line with an arc angle of R10°. There are 150 0.3mm spray holes on the flat plate surface.

[0129] Figure 19 The process flow diagram for the five-stage combined separation system of "1, 2, 2".

[0130] First stage roughing (3~10μm 47% titanium concentrate roughing) → Second stage titanium wire beneficiation (75% titanium-rich material beneficiation) → Third stage titanium wire deep beneficiation (88% titanium-rich material deep beneficiation) → 95% anatase intermediate product; First stage roughing → Second stage iron wire beneficiation (80% iron-rich concentrate) → Third stage iron wire deep beneficiation (90% iron-rich concentrate) → 93% iron-rich concentrate intermediate product.

[0131] Figure 20 This is a schematic diagram of the intermediate product production process.

[0132] The exhibition showcases the complete production process from raw material silo (titanium concentrate) → hexagonal sieve screening → air jet mill crushing → intelligent electric rotary reduction kiln → slurry preparation → dewatering granulator → magnetic levitation primary separation → magnetic levitation titanium / iron ore secondary separation → magnetic levitation titanium / iron ore tertiary deep separation → 95% anatase intermediate product / 93% rich iron concentrate intermediate product, as well as the tailwater treatment and reuse system. Detailed Implementation

[0133] This invention addresses the precise selection of ultrafine-grained minerals in an aqueous medium using a multi-force field approach for ferromagnetic and non-ferromagnetic deeply embedded, fine, and difficult-to-include minerals, but does not limit the scope of this invention.

[0134] The Panzhihua titanium concentrate raw material used in this invention has the following chemical composition: TiO2 47.0%, TFe 33.0%, FeO 34.5%, Fe2O3 5.5%, MgO 4.8%, SiO2 2.8%, CaO 0.8%, Al2O3 0.9%, MnO 0.8%, S 0.15%, P2O5 0.015%, with the remainder being trace rare element impurities. The mineral composition is mainly ilmenite, containing a small amount of titanomagnetite and sulfides. Gangue minerals include pyroxene, olivine, feldspar, chlorite, sphene, spinel, etc., with a total gangue and impurity content of about 9%. Mg and Mn elements are largely embedded in the ilmenite lattice in isomorphous solid solution form. Ilmenite and titanomagnetite have a fine intergrowth structure in solid solution, which is difficult to completely separate and remove impurities using conventional physical beneficiation.

[0135] Example 1: Deep beneficiation of 47% titanium concentrate and preparation of high value-added intermediate products in the Panxi region

[0136] Raw material characteristics and processing objectives

[0137] Raw material sources and characteristics

[0138] TiO2 grade: 47%±2%;

[0139] TFe grade: 35% ± 2%;

[0140] Main titanium-containing minerals: Ilmenite (FeTiO3, about 85%), anatase (TiO2, about 10%), rutile (TiO2, about 5%);

[0141] Main iron-bearing minerals: ilmenite, magnetite (Fe3O4, minor amount), hematite (Fe2O3, trace amount);

[0142] Gangue minerals: Silicates (quartz, feldspar, etc., approximately 15%);

[0143] Inlay type: Deeply dyed inlay type, with a complex relationship between the inlay of ilmenite and gangue minerals;

[0144] Conjoined twins ratio: 40%;

[0145] Raw ore particle size: d 50 ≈10μm, -10μm content >60%, belonging to ultrafine-grained minerals that are extremely difficult to beneficiate;

[0146] Magnetic characteristics: Ilmenite is weakly magnetic (specific magnetic susceptibility approximately 3.3 × 10⁻⁻). 6 Magnetite is strongly magnetic (m³ / kg).

[0147] The raw material used in this embodiment is titanium concentrate produced by an ilmenite beneficiation plant in the Panxi region, and its typical characteristics are as follows:

[0148] Processing target

[0149] Through a five-stage combined beneficiation system ("1, 2, 2"), 47% titanium concentrate was deeply separated into two product lines:

[0150] Titanium wire products: 95% anatase intermediate, used as a raw material for preparing 3N-grade (99.9%) anatase photocatalysts.

[0151] Iron wire products: 93% rich iron concentrate intermediate product, used as raw material for preparing 2N grade (99%) nanoscale ferromagnetic microwave absorbing materials.

[0152] Full-process production technology (see) Figure 20 (Diagram of intermediate product production process)

[0153] Slurry preparation and granulation section

[0154] Mixing

[0155] The magnetized and crushed mineral powder with a narrow particle size of 3~10μm enters the slurry preparation process:

[0156] Water source: Tap water is purified before entering the water tower, and then supplied to the slurry preparation unit.

[0157] Slurry concentration: 25%~30%

[0158] Slurry preparation method: Use low-speed stirring (<20 r / min) to prepare the slurry, to avoid re-aggregation of the dispersed intergrowths.

[0159] pH adjustment: Natural pH, no acid-base adjuster required.

[0160] Dehydration granulator

[0161] After slurry preparation, the slurry enters the dewatering and granulation tank:

[0162] Function: During the process of the slurry passing through the 11-micron sieve in the dewatering granulator, the intergrowth is further granulated by shear force (similar to the dewatering method of an intelligent washing machine) and then the slurry is sent to the separation system.

[0163] Discharge concentration: Controlled at 25%~30%, matching the feed concentration of the magnetic flotation system.

[0164] The five-segment combined maglev section selection of “1, 2, 2” (see…) Figure 19 (Process flow diagram of the five-stage combined separation system)

[0165] After slurry conditioning and granulation, the slurry enters the multi-force field non-drive dual electromagnetic static stepping drag coupling negative pressure flotation system of the present invention for "1, 2, 2" five-stage joint separation.

[0166] First paragraph: Select a section (initial selection / rough selection)

[0167] Feed conditions: Concentration 25%~30%, particle size 3~10μm

[0168] Sorting Objectives: To achieve preliminary separation of titanium and iron minerals from gangue minerals, and simultaneously to separate the slurry into two flows—titanium wires and iron wires—based on magnetic differences.

[0169] Process parameters:

[0170] Surface magnetic field of electromagnet assembly: 3500 Gauss

[0171] Front / rear spray vane water pressure: 0.15MPa, elevation angle 1° relative to direct spray

[0172] Water pressure of left and right spray plates: 0.10MPa, elevation angle 1°, relative semi-atomized wide-angle spray.

[0173] Step timing cycle: Forward power-on 8s → Buffer voltage reduction 2s → Reverse demagnetization 3s → Static detachment 5s (Total 18s)

[0174] Vacuum level of negative pressure suction: -0.04MPa

[0175] Sorting results:

[0176] Titanium wire roughing concentrate: TiO2 grade approximately 55%, proceeding to the secondary beneficiation stage of titanium-rich ore.

[0177] Iron wire rod roughing concentrate: TFe grade approximately 50%, proceeding to the second stage of rich iron ore beneficiation.

[0178] The tailings from the mineral processing plant have a TiO2 content of less than 15% and enter the tailings treatment system.

[0179] Second Section: Second-Stage Refinement of Titanium-Rich Ore

[0180] Feed: A section of titanium wire rod roughing concentrate

[0181] Sorting objectives: Increase titanium grade to 75%, and further remove iron minerals and gangue.

[0182] Process parameters:

[0183] Surface magnetic field of the electromagnet assembly: 3000 Gauss (lower than the first stage, reducing iron mineral inclusions).

[0184] Front / rear spray plate water pressure: 0.12MPa

[0185] Water pressure of left and right spray plates: 0.08MPa

[0186] Step timing cycle: 20s

[0187] Vacuum level for negative pressure suction: -0.05MPa

[0188] Sorting results:

[0189] Titanium wire section two-stage beneficiation concentrate: TiO2 grade approximately 75%, entering the titanium-rich ore section three-stage deep beneficiation.

[0190] Second-stage mineral processing tailings: returned to the first-stage roughing process or sent to the tailings treatment system.

[0191] Section 3: Three-stage deep selection of titanium-rich ore

[0192] Feed: Two-stage titanium wire concentrate

[0193] Sorting: Further increase the titanium grade to approximately 95% to obtain high-purity anatase intermediate products.

[0194] Process parameters:

[0195] Surface magnetic field of the electromagnet assembly: 2500 Gauss (further reduced to strictly suppress iron minerals).

[0196] Front / rear spray plate water pressure: 0.10MPa

[0197] Water pressure of left and right spray plates: 0.06MPa

[0198] Step timing cycle: 22s

[0199] Vacuum level for negative pressure suction: -0.06MPa

[0200] Sorting results:

[0201] Final titanium wire product: 95% anatase intermediate, used as a raw material for preparing 3N-grade anatase photocatalysts.

[0202] Three-stage beneficiation tailings: returned to the second-stage beneficiation stage.

[0203] Second Section: Second-Stage Refinement of Magnetite-Rich Ore

[0204] Feed: A section of iron wire for roughing and concentrate

[0205] Sorting objectives: Increase iron content to 80%, and further remove titanium minerals and gangue.

[0206] Process parameters:

[0207] Surface magnetic field of the electromagnet assembly: 3800 Gauss (increased compared to the first stage, enhancing iron ore capture).

[0208] Front / rear spray plate water pressure: 0.18MPa

[0209] Water pressure of left and right spray plates: 0.12MPa

[0210] Step timing cycle: 16s

[0211] Vacuum level of negative pressure suction: -0.03MPa

[0212] Sorting results:

[0213] The second stage of iron wire concentrate has a TFe grade of approximately 80%, and it is then processed into the third stage of deep refining for magnetite.

[0214] Second-stage beneficiation tailings: returned to the first-stage roughing process or incorporated into the titanium wire system.

[0215] Section 3: Three-stage deep refining of magnetite-rich ore

[0216] Feed: Two-stage iron wire concentrate

[0217] Sorting: Further increase the iron content to 93% to obtain high-purity magnetite concentrate intermediate products.

[0218] Process parameters:

[0219] Electromagnetic array working surface magnetic field: 4000 Gauss (further increase to ensure complete capture of iron ore).

[0220] Front / rear spray plate water pressure: 0.20MPa

[0221] Water pressure of left and right spray plates: 0.15MPa

[0222] Step timing cycle: 15s

[0223] Vacuum level of negative pressure suction: -0.02MPa

[0224] Sorting results:

[0225] Final iron wire product: 93% magnetite-rich concentrate intermediate product, used as a raw material for preparing 2N nanoscale ferromagnetic microwave absorbing materials.

[0226] Three-stage beneficiation tailings: returned to the second-stage beneficiation stage.

[0227] Tailwater Treatment and Reuse Section

[0228] Tailings from each mineral processing stage enter the tailings treatment system:

[0229] The tailings water from the mineral processing plant enters a two-stage reverse-flow water purification system. After pH testing, it is purified and reused.

[0230] The tailings from the second and third stage mineral processing are returned to the preceding stages for recycling, and finally flow into the first stage tailings treatment system.

[0231] Water purification process: A two-stage reverse purification process is adopted to remove suspended solids, heavy metal ions, etc., and the effluent is reused for slurry preparation or to supplement the water supply for the spray plates.

[0232] Water recycling rate: >90%

[0233] Intermediate product characteristics and downstream application connections

[0234] 95% anatase intermediate products

[0235] Product Features

[0236] TiO2 grade: 95%±1%;

[0237] Major mineral phases: anatase TiO2 (>90%), minor rutile TiO2;

[0238] Impurity content: TFe < 2%, SiO2 < 1.5%, Al2O3 < 0.5%, others < 1%;

[0239] Particle size: d 50 ≈5μm, -10μm content >80%;

[0240] Specific surface area: 15 m² / g (BET method);

[0241] Crystal structure: Tetragonal system, lattice parameters a = 3.784 Å, c = 9.515 Å;

[0242] Morphological characteristics: Nearly spherical or short columnar, with complete crystal form and few defects.

[0243] 93% rich iron concentrate intermediate product

[0244] Product Features

[0245] TFe grade: 93%±1%;

[0246] Major mineral phases: Fe3O4 (magnetite, >95%), minor Fe2O3 and FeO;

[0247] Impurity content: (Mg, Fe2+)(Al, Fe3+)2O4 ≤4.8%, TiO2 <3%, SiO2 <1%, Al2O3 <0.5%, others <2%;

[0248] Particle size: d 50 ≈8μm, -10μm content >75%;

[0249] Magnetic properties: Strong magnetic, specific saturation magnetization σs > 80 emu / g;

[0250] Coercivity: Hc < 200 Oe, classifying it as a soft magnetic material;

[0251] Morphological characteristics: Nearly spherical or octahedral, with complete crystal form.

Claims

1. A multi-force field, transmission-free, dual-electromagnetic, static stepping drag coupling negative pressure flotation system, characterized in that, include: The fluid force field device, with its injection and pressure controlled by a PLC, includes a front spray plate, a rear spray plate, and left and right side spray plates installed within the separation tank. The front and rear spray plates are positioned opposite each other, with the front spray plate having an elevation angle of 1° and the rear spray plate having a depression angle of 5°, forming a relatively direct jet flow field in the water medium. The left and right side spray plates are symmetrically arranged on both sides of the separation tank, with a spray elevation angle of 1° for each, forming a relatively semi-atomized wide-angle jet flow field in the water medium. The fluid force field device is used to propel mineral movement and scour and disperse ultrafine-sized intergrowths, preventing agglomeration and clumping. The dual electromagnetic separation device, controlled by a PLC system, includes an electromagnet assembly installed at the bottom of the separation tank and a steel wire magnetic separation column assembly installed inside the tank. The steel wire magnetic separation columns are paired with the electromagnet assembly at the bottom of the tank to form a dual electromagnetic coupling structure. The dual electromagnetic separation device is used to capture ferromagnetic minerals in the space of the separation tank and drag them to the discharge port at the bottom of the tank for discharge. The negative pressure field device includes a negative pressure adsorption tank, titanium alloy electrostatic electrodes attached around the negative pressure adsorption tank, a negative pressure vacuum suction system, and a centrifugal conveying device, used to suction and discharge non-ferromagnetic minerals. The static electricity removal system includes a static-conducting electrode disposed inside the separation tank. The static-conducting electrode is paired with the magnetic separation column and connected in series with ground to eliminate the static electricity accumulation generated by the friction of mineral particles during the separation process. The fluid force field device, dual electromagnetic separation device, and negative pressure field device form a time-coupled multi-force field joint separation and flotation system under PLC control, which realizes the efficient separation of ferromagnetic minerals and non-ferromagnetic minerals in ultrafine-grained minerals with a particle size of 3~10μm that are deeply embedded, disseminated, flat, fine, difficult to handle, and narrow.

2. A dual-electromagnetic static stepping dragging device, used in the non-drive dual-electromagnetic static stepping dragging coupled negative pressure flotation system of claim 1, characterized in that, include: The electromagnet assembly at the bottom of the tank has a surface magnetic intensity of 4000 Gauss on its electromagnetic working surface, which is used to generate the electromagnetic force field required for dragging and sorting. The magnetic separation column group inside the tank consists of steel wire magnetic separation columns installed perpendicular to the bottom of the tank and the bottom of the tank. The steel wire magnetic separation columns are paired with the electromagnet group outside the bottom of the tank in a one-to-one correspondence array to form a dual electromagnetic group coupling structure, which enhances the magnetic field gradient for spatial capture efficiency of ultrafine-sized ferromagnetic minerals. The PLC timing control module is used to control the static step-drag working mode of the electromagnet assembly at the bottom of the tank. The static step-drag working mode includes the following timing cycle: Forward energizing stage: The electromagnet group is energized in the forward direction to generate a sorting magnetic field, which magnetically attracts and drags ferromagnetic minerals; Buffering and voltage reduction stage: The positive power supply is disconnected, the magnetic field strength is buffered and voltage is reduced, and the magnetic force on the mineral particles gradually weakens; Reverse demagnetization stage: The electrodes are switched and low voltage reverse current is applied to generate a reverse magnetic field, which offsets and cancels the residual magnetism of the electromagnet core. Static shedding stage: All power is turned off and the material is left to stand still. Under the action of gravity and fluid force field, the material completely falls off, the magnetic field returns to zero, and one step dragging cycle is completed.

3. A magnetic separation column-electrostatic electrode paired array structure, used in the driveless dual electromagnetic static stepping drag coupling negative pressure flotation system of claim 1, characterized in that, include: The steel wire magnetic separator is installed in a 1092mm×592mm array vertically inside the bottom of the separation tank. The magnetic column is 440mm high and 2mm in diameter. It is paired with the electromagnet group outside the bottom of the tank to form a dual electromagnetic group coupling structure. The electrostatic conductive electrodes are installed inside the separation tank and are arranged in a pair with the steel wire magnetic separation column. The electrostatic conductive electrodes are connected in series and then grounded, with a grounding resistance of less than 4Ω. The paired array of the steel wire magnetic separation column and the electrostatic conductive electrode forms a "magnetic capture-electrostatic removal" synergistic structure. While the electromagnetic field captures ferromagnetic minerals, the electrostatic conductive electrode removes the static electricity accumulation of mineral particles in real time, preventing non-selective agglomeration caused by electrostatic adsorption.

4. A negative pressure suction flotation device, used in the non-drive dual electromagnetic static stepping drag coupling negative pressure flotation system of claim 1, characterized in that, include: The box body is made of conductive modified ultra-high molecular weight polyethylene, which is composed of conductive carbon powder, short-cut carbon fiber and a small amount of graphite solid. The box body is 520mm long, 400mm wide and 200mm high. The screen has a triangular perforation structure. The inner box has rounded corners and consists of four interconnected triangles covered with 20µm suction holes. The surface of each triangle is covered with a 20µm mesh screen. The box is 520mm long, 400mm wide, and 200mm high. The non-magnetic mineral discharge outlet is located at the bottom center of the adsorption tank and connected to the vacuum machine negative pressure group to draw in non-ferromagnetic minerals under negative pressure. Centrifugal discharge conveying pump is used to transport non-ferromagnetic minerals that have been pumped in. The negative pressure suction flotation device forms a negative pressure zone in the upper part of the separation tank, which generates suction force on the non-ferromagnetic minerals that float to the surface under the action of the fluid force field. The minerals are then sucked in and passed through the 20μm aperture screen on the adsorption tank, and then separated and discharged through the triangular suction holes.

5. The driveless dual-electromagnetic static stepping drag coupling negative pressure flotation system according to claim 1, characterized in that, The front spray plate, rear spray plate, and left and right side spray plates are all made of conductive modified ultra-high molecular weight polyethylene, which is composed of conductive carbon powder, short-cut carbon fibers, and a small amount of graphite solids.

6. The driveless dual-electromagnetic static stepping drag coupling negative pressure flotation system according to claim 1, characterized in that, The sorting tank is a high-silicon glass tank with a bottom thickness of 3mm, and the electromagnet assembly housing is encapsulated in 304 stainless steel resin.

7. The driveless dual-electromagnetic static stepping drag coupling negative pressure flotation system according to claim 1, characterized in that, The separation tank is equipped with an automatic water level balancing system to maintain the stability of the water medium level in the separation tank, with a level fluctuation range of ±5mm.

8. The dual electromagnetic static stepping dragging device according to claim 2, characterized in that, The electromagnet group at the bottom of the tank consists of 76 individual electromagnets arranged in a cyclical pattern according to four zones: A, B, C, and D. Each zone contains 19 electromagnets. The PLC controls each zone to execute the four-step timing cycle in sequence, forming a magnetic capture-drag-release sequence that advances longitudinally along the tank.

9. The dual electromagnetic static stepping dragging device according to claim 2, characterized in that, The single electromagnet includes an upper base, a lower base, and a central column. The upper base and the lower base are each 600mm long, 10mm wide, and 10mm high. The central column is 560mm long, 5mm wide, and 40mm high.

10. The dual electromagnetic static stepping dragging device according to claim 2, characterized in that, The single electromagnet is wound with flat copper enameled wire, which has a narrow side of 2.00mm and a wide side of 4.00mm, forming a heat dissipation air gap of 1mm after winding.

11. The dual electromagnetic static stepping dragging device according to claim 2, characterized in that, It also includes composite magnetic shielding plates, which are disposed on both sides and the bottom of the electromagnet assembly. The front and rear composite magnetic shielding plates have a structure of 0.5mm pure iron + 0.5mm permalloy + 0.5mm pure iron = 1.5mm, with a heat dissipation air gap of 0.5mm; the composite magnetic shielding plates on both sides and the bottom have a structure of 1mm pure iron + 1mm permalloy + 1mm pure iron = 3mm, with a heat dissipation air gap of 1mm.

12. The dual electromagnetic static stepping dragging device according to claim 2, characterized in that, It also includes a temperature monitoring and heat dissipation system, including an infrared temperature sensor and a pressure-adjustable air cooler. The infrared temperature sensor monitors the temperature of the electromagnet coil in real time and automatically starts the air cooler when the temperature exceeds the limit. The temperature of the cooled air is ≤5℃ and the compression speed is 5m / s.

13. The magnetic separation column-electrode pairing array structure according to claim 3, characterized in that, The top of the electrostatic conductive electrode is provided with a plastic cap, which is installed on the magnetic column fixing cover plate. The magnetic column fixing cover plate is perforated in an area of ​​1092mm×592mm with a hole diameter of φ4mm.

14. The negative pressure suction flotation device according to claim 4, characterized in that, The box is made of conductive modified ultra-high molecular weight polyethylene (UHMW-PE). The box is equipped with a triangular hole screen structure. The four corners of the inner box are rounded and it consists of four triangles covered with 20μm suction holes. The surface of the triangles is covered with a 20μm pore screen.

15. The driveless dual-electromagnetic static stepping drag coupling negative pressure flotation system according to claim 1, characterized in that, It also includes a conveying and discharging system, which includes a conveying trough, a retractable baffle, a non-magnetic mineral discharge pipe, a magnetic mineral discharge port, and a magnetic mineral recycling trough.

16. A deep beneficiation process for 47% titanium concentrate in the Panxi region using the system described in any one of claims 1 to 15, characterized in that, The process adopts a five-stage combined separation flow of "1, 2, 2": Coarse selection: Grain size d 50 Titanium concentrate with a particle size of ≈10μm and a TiO2 content of 47% is fed into the system for roughing separation. The surface magnetic field of the electromagnet group is 3500 Gauss, and the stepping time period is 18s, to obtain titanium wire roughing concentrate and iron wire roughing concentrate. Second-stage titanium wire beneficiation: The titanium wire roughing concentrate is beneficiated by electromagnets with a surface magnetic field of 3000 Gauss and a stepping time cycle of 20s to obtain a titanium wire beneficiation concentrate with a TiO2 grade of about 75%. Three-stage titanium wire deep selection: The titanium wire two-stage selection concentrate is deeply selected, with an electromagnet surface magnetic field of 2500 Gauss and a stepping time cycle of 22s to obtain 95% anatase intermediate product. Second-stage iron wire concentrate: The iron wire roughing concentrate is further refined by electromagnetizing the surface magnetic field of 3800 Gauss and stepping time cycle of 16s to obtain iron wire concentrate with a TFe grade of about 80%. Three-stage iron wire deep selection: The iron wire two-stage selection concentrate is deeply selected, the electromagnet surface magnetic field is 4000 Gauss, the stepping time cycle is 15s, and 93% rich iron concentrate intermediate product is obtained.

17. The deep beneficiation process for 47% titanium concentrate in the Panxi region according to claim 16, characterized in that, Before roughing, the material is magnetized and reduced, then degranulated twice by a gas turbine membrane. The first degranulation results in a particle size of 20-38 μm, removing the over-mudized titanium concentrate. The concentrate is then fed into an intelligent electromagnetic reduction rotary kiln, where FeO and Fe2O3 are reduced to Fe3O4 at 500℃ under a reducing atmosphere of CO+H2 (48%)+N2 (52%). The material is then degranulated a second time to 3-10 μm, which is used as the preparation material for the beneficiation process.

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