Method for beneficiation of ilmenite

Abstract

The beneficiation method comprises the following steps that (1) after ilmenite is pretreated, the ilmenite is treated through a high-intensity magnetic separation technology, and coarse ilmenite concentrate is obtained; the strong magnetic separation process is carried out by adopting an SHP strong magnetic separation device; and (2) the rough titanium concentrate is subjected to electric separation process treatment, and titanium concentrate is obtained. According to the beneficiation method of the ilmenite, the ilmenite concentrate with the extremely low calcium and magnesium content is obtained, the requirement that the content of CaO and MgO in boiling titanium dioxide chloride raw materials is smaller than or equal to 1.50% is met, the grade of the ilmenite concentrate product can be improved to 48% or above, the recovery rate can reach 90%, the additional value of the beneficiation product and the economic benefit of a production line are improved, and the beneficiation method is suitable for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a method for dressing ilmenite. Background Art

[0002] At present, the methods for separating ilmenite from primary vanadium-titanium magnetite ore in China mainly adopt the following technical means: ① Gravity separation method: It is suitable for coarse-grained ilmenite. Through gravity separation equipment such as spiral chutes and shaking tables, a large amount of gangue and mud removal are discarded from weak magnetic iron tailings to achieve ilmenite recovery, which is mostly used in seaside placer. ② Magnetic separation method: Since ilmenite has weak magnetism, it can be separated from non-magnetic minerals by magnetic separation. Under a certain field strength, gangue minerals and a part of fine-grained iron-containing silicate minerals in ilmenite are easily thrown into the tailings. Strong magnetic separation can effectively separate ilmenite from gangue minerals to achieve the purpose of enriching ilmenite. ③ Flotation method: Flotation, as a sorting method with high sorting accuracy and good sorting effect, is mainly used in the selection of primary titanium ore or fine-grained ilmenite, including conventional flotation, flocculation flotation, agglomeration flotation, etc.

[0003] The above are the main separation technologies for ilmenite. To obtain ilmenite concentrate with a grade of more than 47%, it is sometimes necessary to combine the above technologies. The most commonly used combined process technology is: strong magnetic-flotation combined process technology, which mainly uses weak magnetic iron separation to enrich the ilmenite ore after crushing and grinding, and then uses vertical ring magnetic separation technology to enrich it. The strong magnetic concentrate uses flotation technology to obtain a concentrate with a TiO2 grade of more than 47%, with a recovery rate of 60-70%. The existing process flow is shown in Figure 1 However, the existing processes have the following disadvantages: the calcium and magnesium content in the titanium concentrate obtained by these combined processes reaches 4% to 6%, and the CaO content exceeds 1%, which is far from meeting the requirement that the CaO+MgO content of the boiling titanium dioxide chloride raw material is ≤1.50%, and it is difficult to be directly used in the production process of titanium dioxide chloride. Summary of the invention

[0004] The present invention provides a method for beneficiating ilmenite, which is used to solve the technical problem of excessively high calcium and magnesium contents in the concentrate mentioned in the background technology.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A method for beneficiating ilmenite comprises the following steps:

[0007] (1) pre-treating the ilmenite and subjecting it to a high-intensity magnetic separation process to obtain a crude titanium concentrate; the high-intensity magnetic separation process is carried out using a SHP high-intensity magnetic separation device;

[0008] (2) The crude titanium concentrate is subjected to an electrostatic separation process to obtain a titanium concentrate.

[0009] The design idea of ​​the above technical solution is that the present invention first selects SHP strong magnetic separation equipment to separate ilmenite, and then performs electrostatic separation. Since the subsequent electrostatic separation process has certain requirements for the grade of crude titanium concentrate (usually greater than 32%), and the ordinary strong magnetic separation equipment currently uses round rod-shaped media, the magnetic field intensity generated around the round rod-shaped media is far from meeting the grade requirements of the electrostatic separation process for crude titanium concentrate. The SHP strong magnetic separation device used in the present invention utilizes the difference in the specific magnetic susceptibility of the material. The ilmenite in the raw material to be selected is a weakly magnetic mineral, while some of the other gangue minerals are weakly magnetic minerals and non-magnetic minerals. There are also obvious differences in the specific magnetic susceptibility of magnetic minerals, other weakly magnetic minerals and ilmenite. A high-gradient magnetic induction medium separation area is required to achieve a relatively good separation effect. The SHP strong magnetic separation equipment can obtain a higher grade of strong magnetic separation titanium concentrate (containing TiO234.76%, recovery rate 86.89%, while the grade of strong magnetic separation titanium concentrate obtained by other magnetic separation equipment is only 30.78%, recovery rate 86.41%), which provides the necessary guarantee for the subsequent electrostatic separation process to select the grade of crude titanium concentrate. At the same time, the SHP strong magnetic separation equipment can also discharge some conductive gangue minerals into the strong magnetic separation tailings, which is more conducive to obtaining qualified ilmenite by electrostatic separation, while some calcium-magnesium-containing pyroxene and amphibole enter the tailings in stages under the combination of strong magnetic separation and electrostatic separation processes, and finally achieve the purpose of reducing calcium and magnesium in titanium concentrate.

[0010] As a further preferred embodiment of the above technical solution, in the strong magnetic separation process described in step (1), in the SHP strong magnetic separation device, a 2.5mm gap serrated medium tooth plate is used in the separation disc, and the tooth spacing is 1.8mm; the flushing water pressure of the coarse titanium concentrate is 0.25mpa. The subsequent electrostatic separation process also has very high requirements for the feed particle size, and the coarse titanium concentrate particle size level is required to be as narrow as possible. Before using SHP strong magnetic separation, steel ball medium grinding equipment must be used for grinding. On the one hand, the content of particle size -0.074mm is controlled at about 45%, and at the same time, under the premise of ensuring the degree of dissociation, the coarse particle size +0.08mm material must be ensured as much as possible to obtain a feed particle size suitable for coarse particle electrostatic separation. At the same time, the particle size recovery rate of some -0.08mm ilmenite obtained by using SHP strong magnetic separation equipment reaches more than 80%, while the particle size recovery rate of ilmenite -0.08mm obtained by using ordinary strong magnetic separation equipment can only reach about 60%. Under this particle size condition, it is necessary to use a 2.5mm gap serrated medium tooth plate with a tooth spacing of 1.8mm, which can take into account the recovery of both coarse and fine-grained ilmenite.

[0011] As a further preferred embodiment of the above technical solution, in the strong magnetic separation process described in step (1), the material is flushed to enhance the separation effect of non-magnetic material and magnetic material during magnetic separation, and the flushing water pressure is 0.25 MPa. The flushing operation is generally performed when the mineral enters the medium box of the sorting disc, and the concentrate flushing water pressure is set to 0.25 MPa. The non-magnetic material enters the strong magnetic separation tailings as much as possible under the action of the flushing water, while the magnetic material further moves to the concentrate unloading area with the disc under the action of the magnetic force. On the one hand, a suitable strong magnetic concentrate grade and recovery rate can be obtained. Too much pressure will make the scouring force of the water flow on the magnetic mineral greater than the magnetic field suction, thereby causing the magnetic particles to break away from the magnetic field and enter the non-magnetic material, so that the final concentrate recovery rate is reduced and the tailings grade is high; on the other hand, some non-magnetic minerals containing calcium and magnesium can fully enter the tailings to ensure the concentrate grade.

[0012] As a further preferred embodiment of the above technical solution, before the crude titanium concentrate is subjected to the electrostatic separation process in step (2), the crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm, and the material A and material B are subjected to the electrostatic separation process respectively. By means of separate electrostatic separation, the -0.08 mm material is not incorporated into the +0.08 mm material for electrostatic separation, but after SHP is used to obtain a better grade and recovery rate, the material of this particle size is separated by selecting appropriate electrostatic separation process parameters to obtain better indicators, and the problem of too wide particle size in electrostatic separation, which affects the electrostatic separation effect, will not be caused.

[0013] As a further optimization of the above technical solution, the electrostatic separation process for materials A and B includes three-stage separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation, respectively, the voltage of the first electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 260 rpm, and the concentrate and middlings obtained by the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 240 rpm, and the concentrate and middlings obtained by the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 220 rpm, and the concentrate and middlings obtained by the third electrostatic separation are used as titanium concentrate A. The first, second and third electrostatic separations use an electric field of 330 kV to ensure that the conductive material is attracted by the appropriate electric field generated by the electrode module to overcome the centrifugal force generated by the rotation of the separation drum, while the non-conductive material containing calcium and magnesium is adsorbed on the wall of the metal separation drum by the electric field repulsion force generated by 330 kV, and moves with the metal separation drum to the brush module under the action of the centrifugal force, and is unloaded into the tailings under the action of the brush.

[0014] As a further optimization of the above technical solution, the material B is processed by the fourth electric separation, the fifth electric separation and the sixth electric separation respectively; the voltage of the fourth electric separation is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 280 rpm, and the concentrate and the intermediate ore obtained by the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 260 rpm, and the concentrate and the intermediate ore obtained by the fifth electric separation are fed to the sixth electric separation; the voltage of the sixth electric separation is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 240 rpm, and the concentrate and the intermediate ore obtained by the sixth electric separation are used as titanium concentrate B; the titanium concentrate A and the titanium concentrate B are combined to obtain the final titanium concentrate product.

[0015] As a further preferred embodiment of the above technical solution, in step (2), before subjecting the crude titanium concentrate to the electrostatic separation process, the crude titanium concentrate is dried at a drying temperature greater than or equal to 100°C.

[0016] As a further preferred embodiment of the above technical solution, the pretreatment of the ilmenite in step (1) includes grinding, iron removal and slag separation operations.

[0017] The present invention has the following beneficial effects:

[0018] The ilmenite beneficiation method of the present invention fully studies the mineral properties of primary ilmenite, utilizes the difference in magnetism and conductivity between calcium-magnesium-containing minerals and ilmenite, utilizes the combined effect of special SHP magnetic separation equipment and process output in the magnetic separation process, so that non-magnetic calcium-magnesium minerals are separated from ilmenite, and in the second stage, electric separation equipment and a specific process are used to produce a combined effect, so that non-conductive calcium-magnesium minerals and ilmenite are separated, thereby finally achieving the above-mentioned goal, realizing technical innovation in the beneficiation process, obtaining titanium concentrate with extremely low calcium-magnesium content (CaO content is not more than 0.14%, MgO content is not more than 1.29%), meeting the requirement that the CaO+MgO content of boiling chloride titanium dioxide raw material is ≤1.50%, and the grade of titanium concentrate product can be increased to more than 48%, and the recovery rate can reach 90%, thereby increasing the added value of beneficiation products and the economic benefits of the production line, and being suitable for large-scale industrial production.

[0019] The present invention will be further described in detail below with reference to specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The process flow chart of the existing ilmenite beneficiation process;

[0021] Figure 2 This is a process flow chart of the ilmenite beneficiation method of Example 1. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0023] Embodiment 1:

[0024] like Figure 2 As shown, the ilmenite beneficiation method of this embodiment is used to process a native ilmenite material in Russia, comprising the following steps:

[0025] (1) The ilmenite is ground to a particle content of -0.074 mm and reaches 50%, and then after weak magnetic iron removal and slag separation, the SHP strong magnetic separator is used for strong magnetic separation to obtain a crude titanium concentrate; in the SHP strong magnetic separation device, a 2.5 mm gap sawtooth medium tooth plate is used in the separation disc, the tooth spacing is 1.8 mm, and the magnetic induction field strength of the magnetic separation is 8000 Tesla; in the strong magnetic separation process, the ilmenite is flushed when it enters the medium box of the SHP strong magnetic separator separation disc, and the flushing water pressure is 0.25 MPa. The crude titanium concentrate is tested, and its grade is 33.84% and the recovery rate is 86.82%.

[0026] (2) The crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm. After drying and dehydrating at 100°C, material A and material B are subjected to electrostatic separation treatment respectively. The electrostatic separation treatment of material A and material B includes three stages of separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation respectively. The voltage of the first electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 260 rpm, and the concentrate and middlings obtained from the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; The voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are used as titanium concentrate A; material B is processed by the fourth electric separation, the fifth electric separation and the sixth electric separation respectively; the voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is 360 kV, the speed of the separation drum is 260 rpm, and the concentrate and middlings obtained from the fifth electric separation are fed to the sixth electric separation; the voltage of the sixth electric separation is 360 kV, the speed of the separation drum is 240 rpm, and the concentrate and middlings obtained from the sixth electric separation are used as titanium concentrate B, and the titanium concentrate A and the titanium concentrate B are combined to obtain the final titanium concentrate product.

[0027] The final titanium concentrate product was tested and its TiO2 grade was 48.60%, the recovery rate was 96.39%, of which the CaO mass content was 0.14% and the MgO mass content was 1.29%, meeting the requirement that the CaO+MgO content of the boiling chloride titanium dioxide raw material is ≤1.50%.

[0028] Embodiment 2:

[0029] like Figure 2 As shown, the ilmenite beneficiation method of this embodiment is used to process a native ilmenite material from Russia that is the same as that in Example 1, and comprises the following steps:

[0030] (1) The ilmenite is ground to a particle content of -0.074 mm with a fineness of 50%, and then subjected to weak magnetic iron removal and slag separation, and then subjected to a strong magnetic separation process using a SHP strong magnetic separator to obtain a crude titanium concentrate; in the SHP strong magnetic separation device, a 3.5 mm gap sawtooth medium tooth plate is used in the separation disc, and the tooth spacing is 2.5 mm; the magnetic induction field strength of the magnetic separation is 7500 Tesla; in the strong magnetic separation process, the ilmenite is flushed when it enters the medium box of the SHP strong magnetic separator separation disc, and the flushing water pressure is 0.25 MPa. The crude titanium concentrate is tested, and its grade is 31.78%, and the recovery rate is 60.45%.

[0031] (2) The crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm. After drying and dehydrating at 100°C, material A and material B are subjected to electrostatic separation treatment respectively. The electrostatic separation treatment of material A and material B includes three stages of separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation respectively. The voltage of the first electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 260 rpm, and the concentrate and middlings obtained from the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; The voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are used as titanium concentrate A; material B is processed by the fourth electric separation, the fifth electric separation and the sixth electric separation respectively; the voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is 360 kV, the speed of the separation drum is 260 rpm, and the concentrate and middlings obtained from the fifth electric separation are fed to the sixth electric separation; the voltage of the sixth electric separation is 360 kV, the speed of the separation drum is 240 rpm, and the concentrate and middlings obtained from the sixth electric separation are used as titanium concentrate B, and the titanium concentrate A and the titanium concentrate B are combined to obtain the final titanium concentrate product.

[0032] The final titanium concentrate product was tested and its TiO2 grade was 47.64%, the recovery rate was 80.41%, of which the CaO mass content was 0.21%, the MgO mass content was 1.32%, and the CaO+MgO content was >1.50%.

[0033] Embodiment 3:

[0034] like Figure 2As shown, the ilmenite beneficiation method of this embodiment is used to process a native ilmenite material from Russia that is the same as that in Example 1, and comprises the following steps:

[0035] (1) The ilmenite is ground to a particle content of -0.074 mm reaching 50%, and then subjected to weak magnetic iron removal and slag separation, and then subjected to a strong magnetic separation process using a SHP strong magnetic separator to obtain a crude titanium concentrate; in the SHP strong magnetic separation device, a 3.5 mm gap serrated medium tooth plate is used in the separation disc, and the tooth spacing is 2.5 mm; the magnetic induction field strength of the magnetic separation is 8500 Tesla; the crude titanium concentrate is tested, and its grade is 29.42%, and the recovery rate is 68.20%.

[0036] (2) The crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm. After drying and dehydrating at 100°C, material A and material B are subjected to electrostatic separation treatment respectively. The electrostatic separation treatment of material A and material B includes three stages of separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation respectively. The voltage of the first electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 260 rpm, and the concentrate and middlings obtained from the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; The voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are used as titanium concentrate A; material B is processed by the fourth electric separation, the fifth electric separation and the sixth electric separation respectively; the voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is 360 kV, the speed of the separation drum is 260 rpm, and the concentrate and middlings obtained from the fifth electric separation are fed to the sixth electric separation; the voltage of the sixth electric separation is 360 kV, the speed of the separation drum is 240 rpm, and the concentrate and middlings obtained from the sixth electric separation are used as titanium concentrate B, and the titanium concentrate A and the titanium concentrate B are combined to obtain the final titanium concentrate product.

[0037] The final titanium concentrate product was tested and found to have a TiO2 grade of 47.21% and a recovery rate of 72.88%, with a CaO mass content of 0.41%, a MgO mass content of 2.12%, and a CaO+MgO content of >1.50%.

[0038] Comparative Example 1:

[0039] The ilmenite beneficiation method of this comparative example is used to process a native ilmenite material from Russia that is the same as that in Example 1, and comprises the following steps:

[0040] (1) The ilmenite is ground to a particle content of -0.074 mm to 50%, and then subjected to weak magnetic iron removal and slag separation, and then subjected to strong magnetic separation by a common magnetic separator, with a magnetic induction field strength of 8500 Tesla, to obtain a crude titanium concentrate. The crude titanium concentrate is tested, and its grade is 26.83% and its recovery rate is 60.45%.

[0041] (2) The crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm. After drying and dehydrating at 100°C, material A and material B are subjected to electrostatic separation treatment respectively. The electrostatic separation treatment of material A and material B includes three stages of separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation respectively. The voltage of the first electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 260 rpm, and the concentrate and middlings obtained from the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is equal to 330 kV, the speed of the separation drum is equal to 240 rpm, and the concentrate and middlings obtained from the second electrostatic separation are fed to the third electrostatic separation; The voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are used as titanium concentrate A; material B is processed by the fourth electric separation, the fifth electric separation and the sixth electric separation respectively; the voltage of the fourth electric separation is 360 kV, the speed of the separation drum is 280 rpm, and the concentrate and middlings obtained from the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is 360 kV, the speed of the separation drum is 260 rpm, and the concentrate and middlings obtained from the fifth electric separation are fed to the sixth electric separation; the voltage of the sixth electric separation is 360 kV, the speed of the separation drum is 240 rpm, and the concentrate and middlings obtained from the sixth electric separation are used as titanium concentrate B, and the titanium concentrate A and the titanium concentrate B are combined to obtain the final titanium concentrate product.

[0042] The final titanium concentrate product was tested and its TiO2 grade was 47.09%, the recovery rate was 61.21%, the CaO mass content was 0.54%, the MgO mass content was 2.28%, and the CaO+MgO content was >1.50%.

[0043] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for beneficiating ilmenite, characterized in that: The following steps are involved: (1) pre-treating the ilmenite and subjecting it to a high-intensity magnetic separation process to obtain a crude titanium concentrate; the high-intensity magnetic separation process is carried out using a SHP high-intensity magnetic separation device; (2) The crude titanium concentrate is subjected to an electrostatic separation process to obtain a titanium concentrate.

2. The ilmenite beneficiation method according to claim 1, characterized in that: In the high-intensity magnetic separation process of step (1), in the SHP high-intensity magnetic separation device, a 2.5 mm gap serrated medium tooth plate is used in the separation disc, and the tooth spacing is 1.8 mm.

3. The ilmenite beneficiation method according to claim 2, characterized in that: The magnetic separation magnetic induction intensity of the strong magnetic separation process is 7500-8500 Tesla.

4. The ilmenite beneficiation method according to claim 1, characterized in that: During the high-intensity magnetic separation process in step (1), the material is flushed to enhance the separation effect of non-magnetic materials and magnetic materials during the magnetic separation process, and the flushing water pressure is 0.25 MPa.

5. The ilmenite beneficiation method according to claim 1, characterized in that: Step (2) Before subjecting the crude titanium concentrate to electrostatic separation, the crude titanium concentrate is divided into material A with a particle size of +0.08 mm and material B with a particle size of -0.08 mm, and material A and material B are subjected to electrostatic separation respectively.

6. The ilmenite beneficiation method according to claim 5, characterized in that: The electrostatic separation process for material A and material B includes three-stage separation treatment; material A is subjected to first electrostatic separation, second electrostatic separation and third electrostatic separation, respectively, the voltage of the first electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 260 rpm, and the concentrate and middlings obtained by the first electrostatic separation are fed to the second electrostatic separation; the voltage of the second electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 240 rpm, and the concentrate and middlings obtained by the second electrostatic separation are fed to the third electrostatic separation; the voltage of the third electrostatic separation is greater than or equal to 330 kV, the speed of the separation drum is greater than or equal to 220 rpm, and the concentrate and middlings obtained by the third electrostatic separation are used as titanium concentrate A.

7. The ilmenite beneficiation method according to claim 6, characterized in that: The material B is processed by the fourth, fifth and sixth electric separations respectively; the voltage of the fourth electric separation is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 280 rpm, and the concentrate and the middlings obtained by the fourth electric separation are fed to the fifth electric separation; the voltage of the fifth electric separation is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 260 rpm, and the concentrate and the middlings obtained by the fifth electric separation are fed to the sixth electric separation; The voltage of the sixth electro-selection is greater than or equal to 360 kV, the speed of the separation drum is greater than or equal to 240 rpm, and the concentrate and middlings obtained from the sixth electro-selection are used as titanium concentrate B; the titanium concentrate A and titanium concentrate B are combined to obtain the final titanium concentrate product.

8. The ilmenite beneficiation method according to any one of claims 1 to 7, characterized in that: Step (2) Before subjecting the crude titanium concentrate to the electrostatic separation process, the crude titanium concentrate is dried at a drying temperature greater than or equal to 100°C.

9. The ilmenite beneficiation method according to any one of claims 1 to 7, characterized in that: The pretreatment of the ilmenite in step (1) includes grinding, iron removal and slag separation operations.

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