Ilmenite pre-selection device and ilmenite pre-selection method

Abstract

The ilmenite preselection device comprises a vertical cavity and an inclined cavity, an ascending water pipe is connected to the periphery of the vertical cavity, inclined plates with the same shape and size are arranged in the inclined cavity, each inclined plate is provided with a water supplementing and adding open groove, and the ilmenite preselection device further comprises a water supplementing and adding pipe, a tailing discharging part and a stirring part; a body of the vertical cavity is a cylinder, the lower portion of the body is a cone, and the body is provided with an ore feeding pipe. The ascending water pipe is used for inputting water into the vertical cavity and pushing low-density mineral particles in the ascending water pipe to move upwards along the inclined plates in the vertical cavity and the inclined cavity by using the input water and water supplemented from the supplementing water pipe, so that the low-density mineral particles are pushed out from the tailing discharge part; and the high-density ilmenite falls down from the concentrate discharging pipe, so that pre-selection of the ilmenite is realized, and the TiO2 grade of the ilmenite pre-selected concentrate can be remarkably improved on the basis of avoiding pipeline blockage. The invention further discloses an ilmenite pre-selection method.

Description

Technical Field

[0001] The invention belongs to the technical field of comprehensive utilization of vanadium-titanium magnetite, and in particular relates to an ilmenite preselection device and method. Background Art

[0002] Titanium (Ti) is a silvery-white transition metal with a density of only 4.5g / cm³, approximately 60% that of steel, yet boasts the highest specific strength of any metal. With a melting point of 1660°C, it exhibits excellent resistance to both high and low temperatures, as well as exceptional corrosion resistance and biocompatibility. Known as both a "space metal" and a "biometal," titanium's four key characteristics—lightness, strength, corrosion resistance, and biofriendliness—combined with advancements in smelting, forming, and surface modification technologies, are expanding beyond traditional aerospace applications into broader markets such as hydrogen energy, healthcare, and consumer electronics. The primary industrially valuable titanium-containing minerals in nature are ilmenite (FeTiO3) and rutile (TiO2). ilmenite accounts for approximately 93.42% of titanium resources (measured as TiO2).

[0003] The typical process for recovering "medium titanium resources" (typically ilmenite with a TiO2 grade of 15% to 30%) from vanadium-titanium magnetite iron ore tailings can be summarized as a three-stage process: high-intensity magnetic pre-selection → classification and regrinding → flotation upgrading. The core goal is to achieve efficient separation of ilmenite from gangue, sulfide ores, and residual magnetite under fine-grained conditions. The TiO2 grade of the feed entering flotation desulfurization and titanium concentration operations is generally 11% to 18%, while the TiO2 grade of flotation ilmenite concentrate is generally 45% to 47%. This requires the addition of large amounts of sulfuric acid and other flotation reagents. This high acidity results in high flotation reagent consumption and severe corrosion of equipment and pipelines. Therefore, there is an urgent need to improve the TiO2 grade of the feed entering flotation operations to reduce flotation reagent consumption.

[0004] The TFe content in the vanadium-titanium magnetite iron ore tailings used in the existing technology is about 13%, and the TiO2 content is about 9%. Because the TiO2 grade of the pre-selected concentrate using a vertical ring pulsating high-gradient magnetic separator alone can only be increased to 14% to 15%, and the operating recovery rate of TiO2 in the pre-selected concentrate is only 65% ​​to 75%. It can be seen that the pre-selection efficiency of ilmenite is relatively low, which results in a waste of titanium resources. In addition, there is a problem of uneven flow velocity in certain parts during the pre-selection stage, which leads to pipeline blockage, thereby reducing the pre-selection efficiency. Summary of the Invention

[0005] To solve the above problems, the present invention provides an ilmenite preselection device and method, which can significantly improve the TiO2 grade of ilmenite preselection concentrate while avoiding pipeline blockage, reduce the use of reagents, reduce production costs, and improve production efficiency.

[0006] The present invention provides an ilmenite preselection device, comprising a vertical cavity and an inclined cavity that are interconnected, the vertical cavity being located below the inclined cavity and having an ascending water pipe connected to its outer periphery, the inclined cavity containing inclined plates of all the same shape and size, each of the inclined plates being provided with a water supply slot, and also comprising a water supply pipe that passes through all the water supply slots at the same time, a tailings discharge portion being provided above the inclined cavity, a stirring component being accommodated inside the vertical cavity, the body of the vertical cavity being cylindrical and the lower part being conical, a feeding pipe being provided on the outer periphery of the body, and a concentrate discharge pipe being provided below the cone, the ascending water pipe being used to input water into the vertical cavity and using the input water and the water supplied from the water supply pipe to jointly push the low-density mineral particles therein to move upward along the inclined plates in the vertical cavity and the inclined cavity, so that the low-density mineral particles are pushed out from the tailings discharge portion and the high-density ilmenite falls from the concentrate discharge pipe, thereby realizing the preselection of ilmenite.

[0007] Preferably, in the above ilmenite pre-selection device, the cross section of the inclined cavity is a square with a side length of 15 cm to 20 cm, and the inclination angle relative to the horizontal plane is 65° to 75°.

[0008] Preferably, in the above ilmenite pre-selection device, the inclined plates have smooth surfaces, and the spacing between adjacent inclined plates is 0.8 cm to 1.2 cm, and the length of the inclined plates is 120 cm to 180 cm.

[0009] Preferably, in the above-mentioned ilmenite pre-selection device, the main body of the vertical cavity is in the shape of a cylinder with a diameter of 30 cm to 40 cm and a height of 40 cm to 60 cm.

[0010] Preferably, in the above ilmenite pre-selection device, the rising water pipes are arranged at the connection portion between the main body and the cone and are 6 to 8 in number, with a diameter of 1 cm to 2 cm, and are evenly distributed along the outer periphery of the cone;

[0011] The water supply pipe is arranged in the horizontal direction and has a diameter of 0.8 cm to 1.2 cm. The water supply pipe is inserted into the slot of the inclined cavity, and the outside of the slot of the inclined cavity is sealed. The height of the water supply slot itself is 0.2 mm to 0.4 mm, and the spacing between adjacent water supply pipes is 20 cm to 30 cm.

[0012] Preferably, in the above-mentioned ilmenite pre-selection device, the angle between the conical surface of the cone and the horizontal plane is 50° to 70°, the diameter of the concentrate discharge pipe is 1 cm to 2 cm, and the concentrate discharge pipe is further provided with a concentrate discharge valve, and further includes a discharge water supply pipe provided at the connection portion between the concentrate discharge pipe and the cone;

[0013] The tailings discharge part includes a tailings collection trough and a tailings discharge pipe with a diameter of 2 cm to 4 cm.

[0014] Preferably, in the above-mentioned ilmenite pre-selection device, the stirring component includes a stirring impeller and a stirring shaft and a transmission component connected thereto.

[0015] Preferably, in the above ilmenite pre-selection device, the feed pipe is arranged at a middle height position of the main body and has a diameter of 1 cm to 2 cm.

[0016] Preferably, the above-mentioned ilmenite pre-selection device further comprises a frame for supporting the vertical cavity and the inclined cavity.

[0017] The present invention provides an ilmenite preselection method comprising:

[0018] S1: Use high-frequency vibrating screen to separate the iron ore tailings, and the undersize product enters step S2;

[0019] S2: The undersize product enters a permanent magnetic drum separator for weak magnetic iron removal to remove strongly magnetic minerals, and the iron-removed tailings obtained enter step S3;

[0020] S3: The iron-removed tailings are subjected to ilmenite pre-selection using a vertical ring pulsating high gradient magnetic separator, and the obtained first magnetic separation concentrate enters step S4;

[0021] S4: The first magnetic concentrate is classified using a cyclone, the resulting grit enters step S5, and the resulting overflow enters step S7;

[0022] S5: The sediment enters a mixing tank and water is added to adjust the slurry concentration, and the slurry is pumped into step S6;

[0023] S6: Using the ilmenite pre-selection device as described in any one of the above items, adjusting the feed rate, rising water volume, stirring speed, discharge speed and inclined plate water replenishment rate of the ilmenite pre-selection device according to the TiO2 grade of the concentrate and tailings, the blockage of the ore at both ends along the long side of the inclined plate cross section, the tailings concentration and the slurry concentration in the inclined cavity, to obtain a first pre-selected titanium concentrate;

[0024] S7: pre-selecting the ilmenite on the overflow using a vertical ring pulsating high gradient magnetic separator, and obtaining a second magnetically separated concentrate as a second pre-selected ilmenite concentrate;

[0025] S8: combining the first pre-selected titanium concentrate and the second pre-selected titanium concentrate as a pre-selected titanium total concentrate.

[0026] From the above description, it can be seen that the above-mentioned ilmenite preselection device provided by the present invention includes a vertical cavity and an inclined cavity that are interconnected. The vertical cavity is located below the inclined cavity and is connected to a rising water pipe on the periphery, so that the water entering from the rising water pipe can move in these two cavities. The inclined cavity contains inclined plates of the same shape and size, each of which is provided with a water supply slot, and also includes a water supply pipe that passes through all the water supply slots at the same time, so that water can be replenished at multiple locations to provide additional power for the separation of titanium concentrate and tailings. There is a tailings discharge part above the inclined cavity, so that low-density tailings can be discharged from this tailings discharge part under the push of water. A stirring component is contained inside the vertical cavity, so that the material entering can be fully stirred and dispersed. The main body of the vertical cavity is cylindrical and the lower part is conical, so that the diameter becomes smaller as it goes down, and the water entering will be blocked by it, and most of it will flow upward. The outer periphery of the main body is provided with a feeding pipe, so that the minerals fed into the main body will be stirred It is then pushed by the moving water force. A concentrate discharge pipe is provided under the cone. The density of the titanium concentrate is relatively large, so it will not be carried up by the water force, but can fall into the concentrate discharge pipe under the action of gravity and be discharged, thereby achieving effective separation. Specifically, the rising water pipe is used to input water into the vertical cavity and use the input water and the water added from the replenishing water pipe to jointly push the low-density mineral particles therein to move upward along the inclined plates in the vertical cavity and the inclined cavity, so that the low-density mineral particles are pushed out from the tailings discharge part and the high-density ilmenite falls from the concentrate discharge pipe to achieve the pre-selection of ilmenite. It can be seen that the device uses inclined plates of all the same shape and size, so that there will be the same upward pushing water force on the surface of each inclined plate. In this way, through the consistent control of relevant parameters, it can be ensured that the surface of each inclined plate will not be blocked by materials. Therefore, the device can achieve a significant improvement in the TiO2 grade of the ilmenite pre-selection concentrate on the basis of avoiding pipeline blockage, reduce the use of reagents, reduce production costs, and improve production efficiency. The ilmenite pre-selection method provided by the present invention has the same advantages as the ilmenite pre-selection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of an embodiment of an ilmenite pre-selection device provided by the present invention;

[0029] Figure 2 for Figure 1 A-A' position cross-sectional view;

[0030] Figure 3 This is a schematic diagram of an embodiment of an ilmenite preselection method provided by the present invention. DETAILED DESCRIPTION

[0031] The core of the present invention is to provide an ilmenite preselection device and method, which can significantly improve the TiO2 grade of ilmenite preselection concentrate while avoiding pipeline blockage, reduce the use of reagents, reduce production costs, and improve production efficiency.

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] An embodiment of an ilmenite preselection device provided by the present invention is as follows: Figure 1 As shown, Figure 1This is a schematic diagram of an embodiment of an ilmenite preselection device provided by the present invention. The ilmenite preselection device may include a vertical cavity 1 and an inclined cavity 2 that are interconnected. The vertical cavity 1 is located below the inclined cavity 2 and is connected to a rising water pipe 3 on the periphery. It should be noted that an inverted cone 11 can be used to transition between the vertical cavity 1 and the inclined cavity 2. They can be connected by welding to ensure that there are no gaps and water will not leak out. The rising water pipe 3 is used to input water into the interior. Its shape and size are not limited, and the flow rate of each rising water pipe 3 can be controlled individually. The inclined cavity 2 contains inclined plates 4 of all the same shape and size. This is a key point of this solution. The shape of these inclined plates 4 can be completely There are rectangles of the same size, of course, other shapes can also be selected. As long as the shapes and sizes are the same, the flow rate on each inclined plate surface can be guaranteed to be the same, which makes it easy to adjust the flow rate and avoid blockage problems in certain parts of inclined plate surfaces due to different flow rates. Each inclined plate 4 is provided with a water supply slot 5, and also includes a water supply pipe 6 that passes through all the water supply slots 5 at the same time, so that the added water can pass through each water supply slot 5 to reach each inclined plate 4 respectively, providing auxiliary power for the water flow at this position, better avoiding blockage, and the flow rate of this water supply pipe 6 can be controlled separately. There is a tailings discharge part 7 above the inclined cavity 2, and low-density tailings can be discharged from here, realizing the same as titanium For the separation of concentrate, a stirring component 8 is contained inside the vertical cavity 1, which can stir and disperse the incoming materials evenly to avoid clumping together and causing blockage. The stirring speed of the stirring component 8 can be adjusted and controlled individually. The main body 101 of the vertical cavity 1 is cylindrical and the lower part is a cone 102, so that most of the water flow will not go downward, but can only go upward, thereby providing a basis for material separation. A feeding pipe 9 is provided on the outer periphery of the main body 101, and the minerals can enter the main body 101 from the feeding pipe 9 for separation. A concentrate discharge pipe 10 is provided below the cone 102. Due to the high density of ilmenite concentrate, its gravity is sufficient to resist the upward water force, so it can fall down and flow out from this position. To achieve separation, specifically, the rising water pipe 3 is used to input water into the vertical cavity 1 and use the input water and the water added from the water supply pipe 6 to push the low-density mineral particles therein to move upward along the inclined plates in the vertical cavity 1 and the inclined cavity 2, so that the low-density mineral particles are pushed out from the tailings discharge part 7, and the high-density ilmenite falls from the concentrate discharge pipe 10, thereby achieving the pre-selection of ilmenite. It can be seen that under the action of water force, the low-density mineral particles continue to move upward along the surface of the inclined plate 4, while the high-density ilmenite cannot move upward along the surface of the inclined plate 4 due to its relatively large gravity, but continues to move downward, and finally falls from the concentrate discharge pipe 10, thus achieving effective separation of the two.

[0034] It can be seen from the above description that in the embodiment of the above-mentioned ilmenite preselection device provided by the present invention, since it includes a vertical cavity 1 and an inclined cavity 2 that are interconnected, the vertical cavity 1 is located below the inclined cavity 2 and is connected to a rising water pipe 3 on the periphery, so that the water entering from the rising water pipe 3 can move in the two cavities, and the inclined cavity 2 contains inclined plates 4 with the same shape and size. Each inclined plate 4 is provided with a water supply slot 5, and also includes a water supply pipe 6 that passes through all the water supply slots 5 at the same time, so that water can be replenished at multiple locations to provide titanium concentrate. The tailings are separated from the tailings to provide additional power. There is a tailings discharge part 7 above the inclined cavity 2, so that the tailings with low density can be discharged from the tailings discharge part 7 under the push of water. The vertical cavity 1 contains a stirring component 8, so that the material entering can be fully stirred and dispersed. The main body 101 of the vertical cavity 1 is cylindrical and the lower part is a cone 102. The diameter is smaller as it goes down, and the water entering will be blocked by it, and most of it will flow upward. The outer periphery of the main body 101 is provided with a feed pipe 9, so that the water entering the main body 101 can be fully stirred and dispersed. The minerals will be stirred and then pushed by the moving water. A concentrate discharge pipe 10 is provided under the cone 102. The density of the titanium concentrate is relatively large, so it will not be carried up by the water, but can fall into the concentrate discharge pipe 10 and be discharged under the action of gravity, thereby achieving effective separation. Specifically, the rising water pipe 3 is used to input water into the vertical cavity 1 and use the input water and the water added from the replenishing water pipe 6 to push the low-density mineral particles therein to move upward along the inclined plate 4 in the vertical cavity 1 and the inclined cavity 2, so that the low-density mineral particles are discharged from the tail. The ore discharge part 7 pushes out and causes the high-density ilmenite to fall from the concentrate discharge pipe 10 to achieve the pre-selection of the ilmenite. It can be seen that the device uses inclined plates 4 with the same shape and size, so that there will be the same upward pushing hydraulic force on the surface of each inclined plate 4. In this way, through the consistency control of relevant parameters, it can be ensured that the surface of each inclined plate 4 will not be blocked by materials. Therefore, the device can achieve a significant improvement in the TiO2 grade of the ilmenite pre-selection concentrate on the basis of avoiding pipeline blockage, reducing the use of reagents, reducing production costs, and improving production efficiency.

[0035] In a specific embodiment of the above ilmenite preselection device, reference Figure 2 , Figure 2 for Figure 1In the A-A' position cross-sectional view, the cross-section of the inclined cavity 2 can preferably be a square with a side length of 15cm to 20cm, and the cross-sectional shape and size of the top and bottom ends of the inclined cavity 2 are the same. In this case, each inclined plate 4 is rectangular in shape and has a width of 15cm to 20cm, and is further preferably 18cm, to ensure that there is no gap between the inclined plate 4 and the inner surface of the inclined cavity 2, and the inclination angle of the inclined cavity 2 relative to the horizontal plane can preferably be 65° to 75°, and can further be preferably 70°. The larger the inclination angle, the steeper it is, and the greater the gravity component of the material in the vertical direction, which requires a larger water flow rate to push the low-density mineral particles upward. It can be seen that this angle must be coordinated with the water flow rate to achieve the function of effective separation. In a further embodiment, the inclined plate 4 can have a smooth surface so that it will not cause blockage of particles, and the spacing between adjacent inclined plates 4 can be 0.8 cm to 1.2 cm, and can be further preferably 1.0 cm. This can be determined according to the size of the mineral particles to be processed. When the mineral particles are larger, a larger inclined plate spacing is selected, and vice versa. Moreover, the length of this inclined plate 4 can be preferably 120 cm to 180 cm, and can be further preferably 150 cm. Driven by water flow of this length, it is sufficient to drive all mineral particles to flow out from the top, achieving better separation. If the length is too short, effective separation may not be achieved.

[0036] In another specific embodiment of the ilmenite pre-selection apparatus, the main body 101 of the vertical chamber 1 may be cylindrical with a diameter of 30 cm to 40 cm and a height of 40 cm to 60 cm. In one specific example, the diameter is preferably 30 cm and the height is 50 cm. This provides a sufficient space for stirring, allowing the mineral particles and water entering the chamber to be evenly dispersed, thereby ensuring effective separation. Moreover, the rising water pipe 3 is arranged at the connection part of the main body 101 and the cone 102 and the number is 6 to 8, the diameter is 1cm to 2cm, and it can be further preferably 8, the diameter is preferably 1.5cm, and it is evenly distributed along the outer periphery of the cone 102, so that it can ensure that water can enter each part, so that the hydraulic uniformity is better, so that the mineral particles in each part can move smoothly; Moreover, the above-mentioned water supply pipe 6 is arranged in the horizontal direction and has a diameter of 0.8cm to 1.2cm, and it is further preferably 1.0cm. The water supply pipe 6 is inserted from the groove of the inclined cavity 2, and the outside of the groove of the inclined cavity 2 is sealed, so that water leakage here can be avoided. The height of the water supply groove 5 itself can be preferably 0.2mm to 0.4mm, and can be further 0.3mm, so that more auxiliary force can be provided to the hydraulic power, and the spacing between adjacent water supply pipes 6 is 20cm to 30cm, and can be further preferably 25cm, to achieve effective relay of hydraulic drive. Of course, this spacing can be set according to actual needs.

[0037] In another specific embodiment of the above-mentioned ilmenite pre-selection device, the angle between the cone surface of the cone 102 and the horizontal plane can be preferably 50° to 70°, and further preferably 60°, so that a gradual reduction in cross-sectional area can be provided to avoid excessive impact caused by water supply. The diameter of the concentrate discharge pipe 10 is 1 cm to 2 cm, and further preferably 1.5 cm, which can also be determined according to the size of the ilmenite concentrate, and continue to refer to Figure 1 The concentrate discharge pipe 10 is also provided with a concentrate discharge valve 12, so that the time of concentrate discharge and the size of the discharge flow rate can be controlled according to actual needs. Of course, the end of the concentrate discharge pipe 10 can be connected to the pump body, and the suction of the pump body can be used to achieve rapid discharge of the concentrate. It can also include a discharge supplementary water pipe 13 provided at the connection between the concentrate discharge pipe 10 and the cone 102. The discharge supplementary water pipe 13 can be used to effectively dilute the concentrate at this position, so that it is not easy to block the pipeline; continue to refer to Figure 1 The above-mentioned tailings discharge part 7 can include a tailings collection trough 701 and a tailings discharge pipe 702 with a diameter of 2 cm to 4 cm. This tailings collection trough 701 can collect the water and tailings flowing up from each inclined plate 4, and finally discharge them uniformly from the tailings discharge pipe 702, so as to ensure higher pre-selection efficiency and easier operation.

[0038] In a preferred embodiment of the above ilmenite preselection device, continue to refer to Figure 1 The stirring component 8 may include a stirring impeller 801 and a stirring shaft 802 and a transmission component 803 connected thereto. The transmission component 803 may be connected to an external motor to transmit the rotation of the motor to the stirring shaft 802 to rotate it, thereby driving the stirring impeller 801 to stir in the vertical cavity, thereby making the material stirred more evenly and effectively dispersed, and the stirring speed may be controlled.

[0039] In another preferred embodiment of the ilmenite pre-selection device, the feed pipe 9 can be positioned at the middle height of the body 101 and have a diameter of 1 cm to 2 cm. This allows the ore to be fed into and stirred from the middle height of the body 101, providing a larger stirring space. The diameter can preferably be 1.5 cm. Of course, if larger diameter ore is to be processed, a larger diameter feed pipe 9 should be used. This can be selected based on actual needs and is not a limitation herein.

[0040] In another preferred embodiment of the above-mentioned ilmenite preselection device, a frame 14 for supporting the vertical cavity 1 and the inclined cavity 2 can be further included, so that the vertical cavity 1 and the inclined cavity 2 can be fixed together more firmly to prevent vibration from causing the entire device to loosen. The specific structure of the frame 14 can be determined according to the shape and size of each cavity, which is not limited here.

[0041] The embodiment of the ilmenite preselection method provided by the present invention is as follows: Figure 3 As shown, Figure 3 This is a schematic diagram of an embodiment of a method for pre-selecting ilmenite provided by the present invention. The method for pre-selecting ilmenite may include the following steps:

[0042] S1: Use high-frequency vibrating screen to separate the iron ore tailings, and the undersize product enters step S2;

[0043] Specifically, high-frequency vibrating screens can effectively separate coarse-grained impurities (slag) from recyclable fine-grained minerals in tailings through high-frequency, low-amplitude vibration. They are particularly suitable for the treatment of iron ore tailings with a particle size range of 0.074–0.6 mm.

[0044] S2: The undersize product enters a permanent magnetic drum separator for weak magnetic iron removal to remove strongly magnetic minerals. The iron-removed tailings obtained enter step S3;

[0045] It should be noted that this step can remove strongly magnetic minerals such as magnetite, hematite, and ferrosilicon impurities to avoid interference with subsequent strong magnetic separation or flotation steps.

[0046] S3: The iron-removed tailings are pre-selected for ilmenite using a vertical ring pulsating high gradient magnetic separator, and the obtained first magnetic concentrate enters step S4;

[0047] It should be noted that this can discard more than 70% of the tailings, increase the grade of titanium dioxide by 2.5 to 4 times, and the operating recovery rate is not less than 75%.

[0048] S4: The first magnetic concentrate is classified using a cyclone, the resulting grit enters step S5, and the resulting overflow enters step S7;

[0049] It should be noted that the purpose of this step is to classify the first magnetic separation concentrate and then perform subsequent corresponding treatments.

[0050] S5: The sediment enters the mixing tank and water is added to adjust the slurry concentration, and the slurry is pumped into step S6;

[0051] In this case, the sediment is diluted to facilitate subsequent process treatment.

[0052] S6: Using any of the above ilmenite pre-selection devices, adjusting the feed rate, rising water volume, stirring speed, discharge speed, and inclined plate water replenishment of the ilmenite pre-selection device according to the TiO2 grade of the concentrate and tailings, the blockage of the ore at both ends along the long side of the inclined plate cross section, the tailings concentration, and the slurry concentration inside the inclined cavity, to obtain a first pre-selected ilmenite concentrate;

[0053] It should be noted that, since this ilmenite pre-selection device can prevent blockage, this step can also be carried out more smoothly, ensuring the efficiency of the work.

[0054] S7: pre-selecting the ilmenite from the overflow using a vertical ring pulsating high gradient magnetic separator, and obtaining a second magnetically separated concentrate as a second pre-selected ilmenite concentrate;

[0055] Specifically, after this step, the overflow can be further pre-selected, thereby further improving its quality.

[0056] S8: combining the first pre-selected titanium concentrate and the second pre-selected titanium concentrate as a pre-selected titanium total concentrate.

[0057] It can be seen that the use of these steps can greatly improve the grade of ilmenite, so that there is no need to add too much processing liquid later, which greatly saves production costs.

[0058] In summary, the method adopts the process of iron tailings selection - slag separation - weak magnetic iron removal - strong magnetic pre-selection of ilmenite - strong magnetic concentrate cyclone classification - sand settling using the above device to pre-select ilmenite - overflow using strong magnetic pre-selection of ilmenite, to obtain a pre-selected titanium concentrate product with high TiO2 content, which significantly reduces the amount of material entering the flotation operation, lays the foundation for further economic utilization of vanadium titanium magnetite ilmenite, and has better anti-blocking effect.

[0059] The above device and method are described in detail below with a specific comparative example:

[0060] Table 1 shows the results obtained using a conventional process for concentrating a first-stage high-magnetic concentrate using an SLon500-1.5T vertical ring pulsating high-gradient magnetic separator. The "for operation" in the table is calculated using the feed of that operation as 100%, and the "for iron-separated tailings" is calculated using the iron-separated tailings as 100%.

[0061] Table 1 Results obtained using conventional process

[0062]

[0063] The above-mentioned device and method provided by this application are described in detail as follows:

[0064] The main physical and chemical properties of the ore used are as follows: the iron ore tailings sample contains TFe 14.25%, TiO2 9.22%, V2O5 0.02%, SiO2 43.32%, CaO 10.22%, MgO 7.35%, Al2O3 4.28%, MnO 0.13%, and S 0.25%, and the sample with a particle size of -0.074mm accounts for 63.11%; the sample contains pyroxene 37.27%, ilmenite 25.08%, labradorite 9.60%, hornblende 9.38%, olivine 4.58%, anorthite 3.95%, titanomagnetite 2.94%, albite 1.74%, sphene 1.24%, pyrrhotite 0.96%, and the amount of other minerals is relatively small; the dissociation degree of ilmenite monomer is 88.09%.

[0065] The test process is as follows:

[0066] (1) Slag separation: Add the dry iron ore tailings into the hopper of a 10 cm × 10 cm swing feeder, adjust the swing feeder valve to a feed rate of 100 kg / h, add water to adjust the concentration to 40%, and use a vertical sand pump to feed the tailings into the KM-800-4S vibrating screen for sieving and slag separation. The screen hole diameter is 1.0 mm, and the product on the screen is used as tailings 1;

[0067] (2) Weak magnetic separation and iron removal: The undersize product is fed into the XCRS-ф400×300 drum magnetic separator with a magnetic field strength of 3500Oe. The magnetic concentrate is used as the secondary iron concentrate, and the magnetic tailings are fed into the operation (3) using a vertical sand pump.

[0068] (3) Pre-selection of ilmenite by strong magnetic separation: the magnetic field strength of the SLon500-1.5T vertical ring pulsating high gradient magnetic separator was adjusted to 9000 Oe, the stroke to 35 mm, the stroke rate to 350 times / min, and the rotation speed to 2.5 rad / min for strong magnetic separation to obtain strong magnetic separation tailings as tailings 2, and the strong magnetic separation concentrate entered (4) operation;

[0069] (4) Cyclone classification: Use a φ25 cyclone to classify the medium-strength magnetic concentrate (3). Control the cyclone bottom flow concentration to 50% and flow to the process (5) by gravity. The overflow of the cyclone flows by gravity into the process (7).

[0070] (5) Slurry preparation: Use XDT-15L mixing barrel to adjust the concentration of water to 30% for the cyclone sedimentation, and pump it into (6);

[0071] (6) Preselecting ilmenite using the above-mentioned ilmenite preselection device: adjusting the rising water flow of the ilmenite preselection device to 3 L / min, the stirring speed to 100 rad / min, the ore discharge speed to 0.6 L / min, and the inclined plate water supply volume to 0.05 L / min to 0.2 L / min, to obtain preselected titanium concentrate 1 and tailings 3;

[0072] (7) Preselection of ilmenite by strong magnetic separation: SLon500-1.5T vertical ring pulsating high gradient magnetic separator was used to preselect the ilmenite overflowed from the cyclone in (4). The magnetic field strength was adjusted to 10000 Oe, the stroke was 35 mm, the stroke frequency was 350 times / min, and the rotation speed was 3.0 rad / min for strong magnetic separation. The strong magnetic separation concentrate was used as preselected ilmenite concentrate 2, and the tailings were used as tailings 4.

[0073] (8) Pre-selected titanium concentrate 1 and pre-selected titanium concentrate 2 are the total pre-selected titanium concentrate, and tailings 1, tailings 2, tailings 3 and tailings 4 are the total tailings.

[0074] The results obtained using the device and method provided by this application are shown in Table 2. Table 2 is a table of results obtained using the device and method provided by this application.

[0075] Table 2 Results obtained using the device and method provided in this application

[0076]

[0077] Comparison of the two tables shows that using the apparatus and method provided in this application, a total pre-selected titanium concentrate with an 18.88% yield, a TiO2 content of 30.60%, and a TiO2 recovery of 62.66% can be obtained. Compared with conventional processes, the TiO2 grade of the pre-selected titanium concentrate is increased by 11.84%, the TiO2 recovery rate is increased by 0.51%, and the amount of material entering the flotation operation is reduced by 11.65% (calculated based on the total pre-selected titanium concentrate yield), a reduction of 38.16%. It can be seen that using the process provided in this application, the high-intensity magnetic rougher concentrate can be subjected to coarse and fine classification using a cyclone while avoiding titanium loss due to overflow of the inclined plate. The coarse particles are pre-selected with ilmenite using the new apparatus, and the fine particles are pre-selected with high-intensity magnetic ilmenite, achieving coarse and fine separation. At the same time, the effect of pre-selecting ilmenite with the above-mentioned apparatus for the coarse particles is far greater than that of the existing high-intensity magnetic method, thereby achieving a significantly higher TiO2 grade in the total pre-selected titanium concentrate than the existing process while significantly reducing the amount of material entering the flotation process.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ilmenite pre-selection device, characterized in that: include: A vertical cavity and an inclined cavity are interconnected, the vertical cavity is located below the inclined cavity and is connected to a rising water pipe on the outer periphery, the inclined cavity contains inclined plates of the same shape and size, each of the inclined plates is provided with a water supply slot, and also includes a water supply pipe that passes through all the water supply slots at the same time, a tailings discharge portion is provided above the inclined cavity, a stirring component is accommodated inside the vertical cavity, the main body of the vertical cavity is cylindrical and the lower part is conical, a feeding pipe is provided on the outer periphery of the main body, and a concentrate discharge pipe is provided below the cone, the rising water pipe is used to input water into the vertical cavity and use the input water and the water supplied from the water supply pipe to jointly push the low-density mineral particles therein to move upward along the inclined plates in the vertical cavity and the inclined cavity, so that the low-density mineral particles are pushed out from the tailings discharge portion and the high-density ilmenite falls from the concentrate discharge pipe, thereby realizing the pre-selection of ilmenite.

2. The ilmenite pre-selection device according to claim 1, characterized in that: The cross section of the inclined cavity is a square with a side length of 15 cm to 20 cm, and the inclination angle relative to the horizontal plane is 65° to 75°.

3. The ilmenite pre-selection device according to claim 1, characterized in that: The inclined plates have a smooth surface, and a distance between adjacent inclined plates is 0.8 cm to 1.2 cm. The length of the inclined plates is 120 cm to 180 cm.

4. The ilmenite pre-selection device according to claim 1, characterized in that: The main body of the vertical cavity is in the shape of a cylinder with a diameter of 30 cm to 40 cm and a height of 40 cm to 60 cm.

5. The ilmenite pre-selection device according to claim 1, characterized in that: The rising water pipes are arranged at the connection portion between the main body and the cone and are 6 to 8 in number, with a diameter of 1 cm to 2 cm, and are evenly distributed along the outer periphery of the cone; The water supply pipe is arranged in the horizontal direction and has a diameter of 0.8 cm to 1.2 cm. The water supply pipe is inserted into the slot of the inclined cavity, and the outside of the slot of the inclined cavity is sealed. The height of the water supply slot itself is 0.2 mm to 0.4 mm, and the spacing between adjacent water supply pipes is 20 cm to 30 cm.

6. The ilmenite pre-selection device according to claim 1, characterized in that: The angle between the cone surface and the horizontal plane is 50° to 70°, the diameter of the concentrate discharge pipe is 1 cm to 2 cm, and the concentrate discharge pipe is also provided with a concentrate discharge valve, and further includes a discharge water pipe provided at the connection portion between the concentrate discharge pipe and the cone; The tailings discharge part includes a tailings collection trough and a tailings discharge pipe with a diameter of 2 cm to 4 cm.

7. The ilmenite pre-selection device according to claim 1, characterized in that: The stirring component includes a stirring impeller, a stirring shaft connected thereto, and a transmission component.

8. The ilmenite pre-selection device according to claim 1, characterized in that: The ore feeding pipe is arranged at a middle height position of the main body and has a diameter of 1 cm to 2 cm.

9. The ilmenite pre-selection device according to claim 1, characterized in that: It also includes a frame for supporting the vertical cavity and the inclined cavity.

10. A method for preselecting ilmenite, characterized in that: include: S1: Use high-frequency vibrating screen to separate the iron ore tailings, and the undersize product enters step S2; S2: The undersize product enters a permanent magnetic drum separator for weak magnetic iron removal to remove strongly magnetic minerals, and the iron-removed tailings obtained enter step S3; S3: The iron-removed tailings are subjected to ilmenite pre-selection using a vertical ring pulsating high gradient magnetic separator, and the obtained first magnetic separation concentrate enters step S4; S4: The first magnetic concentrate is classified using a cyclone, the resulting grit enters step S5, and the resulting overflow enters step S7; S5: The sediment enters a mixing tank and water is added to adjust the slurry concentration, and the slurry is pumped into step S6; S6: Using the ilmenite pre-selection device according to any one of claims 1 to 9, adjusting the feed rate, rising water volume, stirring speed, discharge speed, and inclined plate water replenishment rate of the ilmenite pre-selection device according to the TiO2 grade of the concentrate and tailings, the blockage of the ore at both ends along the long side of the inclined plate cross section, the tailings concentration, and the slurry concentration inside the inclined cavity to obtain a first pre-selected titanium concentrate; S7: pre-selecting the ilmenite on the overflow using a vertical ring pulsating high gradient magnetic separator, and obtaining a second magnetically separated concentrate as a second pre-selected ilmenite concentrate; S8: combining the first pre-selected titanium concentrate and the second pre-selected titanium concentrate as a pre-selected titanium total concentrate.

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