Beneficiation method of vanadium titano-magnetite

Abstract

The invention relates to the technical field of mineral processing, and discloses a vanadium titano-magnetite beneficiation method which comprises the following steps: carrying out multi-stage weak magnetic beneficiation on crushed vanadium titano-magnetite to obtain vanadium-titanium-iron concentrate, a coarse-fraction titanium separation raw material and a first fine-fraction titanium separation raw material; performing coarse-grain titanium separation on the coarse-grain titanium separation raw material to obtain a second fine-grain titanium separation raw material, coarse-grain titanium concentrate and cobalt-sulfur rough concentrate; performing fine-grain titanium separation on the first fine-grain titanium separation raw material and the second fine-grain titanium separation raw material to obtain sulfur-cobalt rough concentrate and fine-grain titanium concentrate; and sulfur concentrate and cobalt-nickel concentrate are separated from the cobalt-sulfur rough concentrate obtained through coarse-grain titanium separation and the cobalt-sulfur rough concentrate obtained through fine-grain titanium separation. By means of the scheme, the grade of the iron ore concentrate is guaranteed, and meanwhile the recovery rate and grade of titanium resources are improved.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a beneficiation method for vanadium-titanium magnetite. Background Technology

[0002] The useful minerals of vanadium-titanium magnetite mainly exist in the form of titanomagnetite and ilmenite. At present, the beneficiation process of vanadium-titanium magnetite in the Panxi region generally adopts the principle of "beneficiating iron first and then titanium". Titanium magnetite is usually recovered by a step-by-step grinding and beneficiation process of "multi-stage grinding + multi-stage magnetic separation". Ilmenite is usually recovered by a "two-stage strong magnetic + flotation" process of iron beneficiation tailings.

[0003] As mining in major vanadium-titanium magnetite mines in the Panxi region gradually progresses to deeper levels, the mineral particle size becomes increasingly finer. It is usually necessary to grind the minerals to a finer particle size in order to achieve individual mineral liberation and recover iron concentrate. Therefore, the grinding particle size in the iron beneficiation stage becomes increasingly fine, which leads to a lower titanium concentrate recovery rate in the titanium beneficiation stage. Summary of the Invention

[0004] In view of this, the present invention proposes a beneficiation method for vanadium-titanium magnetite, which solves the problem of low titanium concentrate recovery rate in traditional vanadium-titanium magnetite beneficiation schemes.

[0005] On one hand, embodiments of the present invention provide a method for beneficiating vanadium-titanium magnetite, characterized in that it includes: Multi-stage weak magnetic beneficiation was performed on the crushed vanadium-titanium magnetite to obtain vanadium-titanium iron concentrate, coarse-grained titanium beneficiation raw material and first fine-grained titanium beneficiation raw material. The coarse-grained titanium raw material is subjected to coarse-grained titanium beneficiation to obtain a second fine-grained titanium raw material, coarse-grained titanium concentrate, and cobalt sulfide concentrate. The first and second fine-particle titanium raw materials are subjected to fine-particle titanium beneficiation to obtain cobalt sulfide crude concentrate and fine-particle titanium concentrate. Sulfur concentrate and cobalt-nickel concentrate are separated from coarse-grained titanium beneficiation concentrate and fine-grained titanium beneficiation concentrate, respectively.

[0006] In some embodiments, the crushed vanadium-titanium magnetite is subjected to multi-stage weak magnetic beneficiation to obtain coarse-grained titanium beneficiation feedstock and a first fine-grained titanium beneficiation feedstock, including: The crushed vanadium-titanium magnetite is subjected to four stages of weak magnetic beneficiation in sequence, yielding weak magnetic tailings in stages one, two, three, and four, and vanadium-titanium iron concentrate. The weak magnetic tailings in stage one are the coarse-grained titanium beneficiation raw materials, and the weak magnetic tailings in stages two, three, and four are the fine-grained titanium beneficiation raw materials.

[0007] In some embodiments, the step of performing coarse-grained titanium beneficiation on the coarse-grained titanium feedstock to obtain a second fine-grained titanium feedstock, coarse-grained titanium concentrate, and cobalt-sulfur crude concentrate includes: The coarse-grained titanium raw material is fed into a coarse-grained screen to obtain the coarse-grained undersize material. The coarse-grained undersize material is subjected to coarse-grained deironing, coarse-grained strong magnetic separation, and gravity separation in sequence to obtain gravity concentrate and gravity tailings. The gravity separation tailings are subjected to strong magnetic separation to obtain strong magnetic gravity separation tailings concentrate, wherein the strong magnetic gravity separation tailings concentrate is a second fine-grained titanium beneficiation raw material. The gravity concentrate is fed into a hydrocyclone to obtain hydrocyclone overflow; The overflow from the hydrocyclone is fed into a coarse high-frequency fine screen to obtain the coarse high-frequency fine screen undersize material. The coarse-grained undersize material from the high-frequency fine screen is subjected to two-stage iron removal and tailings concentration to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate.

[0008] In some embodiments, the coarse-grained undersize material is subjected to a first-stage iron removal process, a first-stage strong magnetic separation process, and gravity separation in sequence to obtain gravity concentrate and gravity tailings, including: The coarse-grained undersize material is subjected to primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings. The primary iron removal concentrate is used to feed into the three-stage weak magnetic separation process. The coarse-grained first-stage iron removal tailings were subjected to strong magnetic treatment to obtain a strong magnetic concentrate. Gravity separation is performed on the coarse-grained primary magnetic concentrate to obtain gravity concentrate and gravity tailings; The coarse-grained undersize material from the high-frequency fine screen is subjected to two-stage coarse-grained iron removal and tailings concentration to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate, comprising: The coarse-grained high-frequency fine screen undersize material is fed into the coarse-grained secondary iron removal stage to obtain coarse-grained secondary iron removal concentrate and coarse-grained secondary iron removal tailings. The coarse-grained secondary iron removal concentrate is used to feed into the third stage weak magnetic separation. The coarse-grained two-stage iron removal tailings are concentrated, and the concentrated coarse-grained two-stage iron removal tailings are subjected to sulfur flotation and titanium flotation in sequence to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate.

[0009] In some embodiments, the coarse-grained titanium feedstock is fed into a coarse-grained screen to obtain the coarse-grained undersize material, which includes: The coarse-grained titanium raw material is fed into a coarse-grained screen to obtain the material above the coarse-grained screen and the material below the coarse-grained screen. The material on the coarse screen is subjected to titanium-selective grinding to obtain titanium-selective grinding discharge, which is then returned to the coarse screen.

[0010] In some embodiments, feeding the gravity concentrate into a hydrocyclone to obtain a hydrocyclone overflow includes: The gravity concentrate is fed into a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow; The underflow from the hydrocyclone is subjected to a two-stage titanium-selective grinding process to obtain a titanium-selective grinding discharge, which is then returned to the hydrocyclone.

[0011] In some embodiments, the step of performing fine-grained titanium beneficiation on the first and second fine-grained titanium beneficiation raw materials to obtain cobalt sulfide crude concentrate and fine-grained titanium concentrate includes: The first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are fed into a fine-particle coarse screen to obtain the fine-particle coarse screen undersize material; The fine-grained undersize material is subjected to a series of processes, including primary iron removal, high-intensity magnetic separation, high-intensity magnetic scavenging, high-frequency fine screening, secondary iron removal, and tailings concentration, to obtain cobalt-sulfur crude concentrate and fine-grained titanium concentrate.

[0012] In some embodiments, the fine-particle undersize material is subjected to a series of processes including primary iron removal, high-intensity magnetic separation, high-intensity magnetic scavenging, high-frequency fine screening, secondary iron removal, and tailings concentration to obtain cobalt-sulfur concentrate and fine-particle titanium concentrate, comprising: The fine-grained undersize material is subjected to primary iron removal to obtain primary iron removal tailings. The fine-grained first-stage iron-removing tailings were subjected to fine-grained strong magnetic treatment to obtain fine-grained strong magnetic concentrate and fine-grained strong magnetic tailings. Fine-grained strong magnetic tailings are subjected to fine-grained strong magnetic scavenging to obtain fine-grained strong magnetic scavenging concentrate; The fine-grained strong magnetic concentrate and the fine-grained strong magnetic scavenging concentrate are fed together into a fine-grained high-frequency fine screen to obtain the fine-grained high-frequency fine screen undersize. The fine-particle high-frequency fine screen undersize material is subjected to two-stage iron removal to obtain fine-particle two-stage iron removal tailings; The fine-grained two-stage iron removal tailings are concentrated and then fed sequentially with floating sulfur and floating titanium to obtain cobalt sulfur rough concentrate and fine / ultrafine mixed titanium concentrate.

[0013] In some implementations, the method further includes: The fine-grained iron-de-iron concentrate obtained by fine-grained coarse screen undersize material is fed into the three-stage weak magnetic separation. The fine-grained two-stage de-ironized concentrate obtained by fine-grained high-frequency fine screen undersize material is fed into the three-stage weak magnetic separation. The fine particles obtained from the high-frequency fine screen are fed into the titanium beneficiation stage two grinding process.

[0014] In some embodiments, the first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are fed into a fine-particle coarse screen to obtain the fine-particle coarse screen undersize material comprising: The first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are concentrated and then fed into a fine-particle coarse screen to obtain the material above the fine-particle coarse screen and the material below the fine-particle coarse screen. The fine particles from the coarse screen are fed into the titanium-selective grinding stage.

[0015] The present invention has at least the following beneficial effects: This invention provides a beneficiation method for vanadium-titanium magnetite. The method includes performing multi-stage weak magnetic separation on crushed vanadium-titanium magnetite to obtain vanadium-titanium iron concentrate, coarse-grained titanium beneficiation feedstock, and a first fine-grained titanium beneficiation feedstock; performing coarse-grained titanium beneficiation on the coarse-grained titanium beneficiation feedstock to obtain a second fine-grained titanium beneficiation feedstock, coarse-grained titanium concentrate, and cobalt-sulfur rough concentrate; performing fine-grained titanium beneficiation on the first and second fine-grained titanium beneficiation feedstocks to obtain cobalt-sulfur rough concentrate and fine-grained titanium concentrate; and separating sulfur concentrate and cobalt-nickel concentrate and their grades from the cobalt-sulfur rough concentrate obtained from the coarse-grained titanium beneficiation and the cobalt-sulfur rough concentrate obtained from the fine-grained titanium beneficiation. In this embodiment of the invention, by performing multi-stage weak magnetic separation on crushed vanadium-titanium magnetite, suitable material particle size conditions can be created for subsequent titanium beneficiation, ensuring the grade of the iron concentrate. Titanium can be graded by separating the coarse-grained titanium feedstock and the first fine-grained titanium feedstock obtained by multi-stage weak magnetic separation. This allows for reasonable segmentation of the flotation particle size range, effectively ensuring the flotation effect and improving the recovery rate and grade of titanium concentrate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a beneficiation method for vanadium-titanium magnetite provided in an embodiment of the present invention; Figure 2 A schematic flowchart of a beneficiation method for vanadium-titanium magnetite provided in an embodiment of the present invention; Figure 3 A flowchart illustrating coarse-grained titanium beneficiation in a vanadium-titanium magnetite beneficiation method provided in an embodiment of the present invention; Figure 4 This is a flowchart of a fine-grain titanium beneficiation method for vanadium-titanium magnetite provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0020] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0022] As mining in major vanadium-titanium magnetite mines in the Panxi region gradually penetrates deeper, the particle size of the minerals becomes increasingly fine. It is usually necessary to grind them to a finer particle size to achieve individual mineral liberation. In addition, the blast furnace production has increasingly higher requirements for the grade of iron concentrate. Therefore, the grinding particle size in the iron beneficiation stage is becoming finer. This makes it difficult to recover a large amount of -38μm micro-fine ilmenite in the iron beneficiation tailings using existing processes. Furthermore, there are problems such as long process flow, low recovery rate, high reagent consumption, and unsatisfactory beneficiation indicators.

[0023] To address at least one of the above technical problems, this invention provides a beneficiation method for vanadium-titanium magnetite. By performing multi-stage weak magnetic separation on the crushed vanadium-titanium magnetite, suitable material particle size conditions are created for subsequent titanium beneficiation, ensuring the grade of iron concentrate. By classifying the coarse-grained titanium beneficiation raw material and the first fine-grained titanium beneficiation raw material obtained from multi-stage weak magnetic separation, the particle size range for flotation is reasonably divided, effectively ensuring the flotation effect and improving the recovery rate and grade of titanium concentrate.

[0024] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.

[0025] The first aspect of this invention provides a method for beneficiating vanadium-titanium magnetite, such as... Figure 1 As shown, the method specifically includes steps S10 to S40.

[0026] S10. Perform multi-stage weak magnetic beneficiation on the crushed vanadium-titanium magnetite to obtain vanadium-titanium iron concentrate, coarse-grained titanium beneficiation raw material and first fine-grained titanium beneficiation raw material.

[0027] S20. Perform coarse-grained titanium beneficiation on the coarse-grained titanium raw material to obtain a second fine-grained titanium raw material, coarse-grained titanium concentrate, and cobalt-sulfur crude concentrate.

[0028] S30. The first and second fine-grained titanium raw materials are subjected to fine-grained titanium beneficiation to obtain cobalt sulfide crude concentrate and fine-grained titanium concentrate.

[0029] S40. Separate sulfur concentrate and cobalt-nickel concentrate from coarse-grained titanium beneficiation and fine-grained titanium beneficiation.

[0030] It should be noted that, in the embodiments of the present invention, crushed mineral particles with a particle size of +0.074 mm and a content greater than 75%, such as coarse-grained titanium raw materials and coarse-grained titanium concentrate, can be considered as coarse particles. Crushed mineral particles with a particle size of -0.074 mm and a content greater than 65%, such as first-fine-grained titanium raw materials, second-fine-grained titanium raw materials, fine-grained titanium concentrate, sulfur concentrate, and cobalt-nickel concentrate, can be considered as fine particles. Particles with a particle size of -0.038 mm among the fine particles can be considered as ultrafine particles. In the embodiments of the present invention, a magnetic field strength of no more than 4000 Gs can be considered as weak magnetic, and a magnetic field strength greater than 4000 Gs can be considered as strong magnetic.

[0031] This invention employs a multi-stage weak magnetic beneficiation process on crushed vanadium-titanium magnetite to obtain vanadium-titanium iron concentrate, coarse-grained titanium beneficiation feedstock, and a first fine-grained titanium beneficiation feedstock. Further coarse-grained titanium beneficiation is performed on the coarse-grained feedstock to obtain a second fine-grained titanium beneficiation feedstock, coarse-grained titanium concentrate, and cobalt-sulfur rough concentrate. Fine-grained titanium beneficiation is then performed on the first and second fine-grained feedstocks to obtain cobalt-sulfur rough concentrate and fine-grained titanium concentrate. A technical solution for separating sulfur concentrate and cobalt-nickel concentrate from the coarse-grained and fine-grained titanium concentrates ensures iron concentrate grade while improving titanium resource recovery rate and grade. This technical solution, through multi-stage weak magnetic beneficiation of crushed vanadium-titanium magnetite, creates suitable material particle size conditions for subsequent titanium beneficiation, ensuring iron concentrate grade. Titanium can be graded by separating the coarse-grained titanium feedstock and the first fine-grained titanium feedstock obtained by multi-stage weak magnetic separation. This allows for reasonable segmentation of the flotation particle size range, effectively ensuring the flotation effect and improving the recovery rate and grade of titanium concentrate.

[0032] In some embodiments of the present invention, step S10, which involves performing multi-stage weak magnetic beneficiation on the crushed vanadium-titanium magnetite to obtain coarse-grained titanium-beneficiate raw material and a first fine-grained titanium-beneficiate raw material, may specifically include: sequentially performing first-stage, second-stage, third-stage, and fourth-stage weak magnetic beneficiation on the crushed vanadium-titanium magnetite to obtain first-stage weak magnetic tailings, second-stage weak magnetic tailings, third-stage weak magnetic tailings, fourth-stage weak magnetic tailings, and vanadium-titanium iron concentrate. The first-stage weak magnetic tailings are the coarse-grained titanium-beneficiate raw material, and the second, third, and fourth-stage weak magnetic tailings are the first fine-grained titanium-beneficiate raw material.

[0033] like Figure 2 As shown, the process of multi-stage weak magnetic beneficiation of crushed vanadium-titanium magnetite to obtain coarse-grained titanium-beneficial raw material and first fine-grained titanium-beneficial raw material is as follows: first stage weak magnetic beneficiation - second stage weak magnetic beneficiation - third stage weak magnetic beneficiation - fourth stage weak magnetic beneficiation.

[0034] First-stage weak magnetic separation: The crushed vanadium-titanium magnetite is fed into a first-stage grinding mill for grinding. The discharged ore enters a first-stage grinding mill for classification. The oversize product is returned to the first-stage grinding mill, and the undersize product is fed into a first-stage weak magnetic separation mill to obtain a first-stage weak magnetic concentrate and a first-stage weak magnetic tailings.

[0035] Two-stage weak magnetic separation: The weak magnetic concentrate from the first stage is fed into the second stage hydrocyclone, the hydrocyclone underflow is fed into the second stage grinding, and the ore discharge is fed into the second stage hydrocyclone; the hydrocyclone overflow is fed into the second stage weak magnetic separation to obtain the second stage weak magnetic concentrate and the second stage weak magnetic tailings.

[0036] Three-stage weak magnetic separation: The weak magnetic concentrate from the second stage (and the secondary iron concentrate from the titanium deferrochemical process) is fed into the third-stage hydrocyclone. The hydrocyclone underflow is fed into the third-stage grinding mill. The discharge is fed into the third-stage weak magnetic separator I, yielding the third-stage weak magnetic separator I concentrate and the third-stage weak magnetic separator I tailings. The third-stage weak magnetic separator I concentrate is returned to the third-stage hydrocyclone. The hydrocyclone overflow is fed into the third-stage weak magnetic separator II, yielding the third-stage weak magnetic separator II concentrate and the third-stage weak magnetic separator II tailings.

[0037] Four-stage weak magnetic separation: The weak magnetic II concentrate from the third stage is fed into the fourth stage hydrocyclone. The overflow from the hydrocyclone is fed into a high-frequency fine screen. The underflow from the hydrocyclone and the overflow from the high-frequency fine screen are fed into the fourth stage grinding. The discharged ore is fed into the fourth stage weak magnetic separation I stage, yielding the fourth stage weak magnetic I concentrate and the fourth stage weak magnetic I tailings. The fourth stage weak magnetic I concentrate is returned to the fourth stage hydrocyclone. The underflow from the high-frequency fine screen is fed into the fourth stage weak magnetic separation II stage, yielding the fourth stage weak magnetic II concentrate and the fourth stage weak magnetic II tailings. The fourth stage weak magnetic II concentrate is the vanadium-titanium iron concentrate product.

[0038] In the aforementioned multi-stage beneficiation scheme, the weakly magnetic tailings from the first stage serve as coarse-grained titanium beneficiation feedstock for the fine-grained titanium beneficiation process. The weakly magnetic tailings from the second, third, and fourth stages serve as fine / ultra-fine-grained titanium beneficiation feedstocks for the fine-grained titanium beneficiation process.

[0039] In the above multi-stage beneficiation scheme, the first stage of grinding and classification can use a linear screen or a banana screen with a screen aperture size of 0.8mm to 1.5mm; the fourth stage of high-frequency fine screen has a screen aperture size of 0.08mm to 0.15mm.

[0040] In the above multi-stage beneficiation scheme, the magnetic field strength of the first stage of weak magnetic beneficiation can be 2500Gs to 4500Gs, the magnetic field strength of the second stage of weak magnetic beneficiation can be 2000Gs to 4000Gs, the magnetic field strength of the third stage of weak magnetic beneficiation I can be 2000Gs to 4000Gs, the magnetic field strength of the third stage of weak magnetic beneficiation II can be 1500Gs to 3800Gs, the magnetic field strength of the fourth stage of weak magnetic beneficiation I can be 1500Gs to 3500Gs, and the magnetic field strength of the fourth stage of weak magnetic beneficiation II can be 1000Gs to 3500Gs.

[0041] The above scheme enables the recovery of iron concentrate from vanadium-titanium magnetite.

[0042] The above scheme, by coarsening the particle size of the first and second stages of grinding to prevent over-grinding of tailings and creating suitable material particle size conditions for subsequent titanium beneficiation, ensures the grade of iron concentrate through thorough fine grinding in the third and fourth stages, and sets up a weak magnetic separation process in the discharge of the third and fourth stages of grinding to remove some tailings in advance, further preventing over-grinding of tailings, thereby effectively improving the recovery rate of iron and titanium resources in vanadium-titanium magnetite.

[0043] The above scheme uses iron tailings from the first stage of iron ore beneficiation as coarse-grained feedstock for titanium beneficiation, and iron tailings from the second, third, and fourth stages of iron ore beneficiation as fine / ultrafine-grained feedstock for titanium beneficiation. By classifying the feedstock into different stages and rationally dividing the particle size range for flotation, the flotation effect is effectively guaranteed, and the recovery rate and grade of titanium concentrate are further improved.

[0044] In some embodiments of the present invention, combined with Figure 2 and Figure 3 The specific process of coarse-grained titanium beneficiation to obtain second-fine-grained titanium beneficiation feedstock, coarse-grained titanium concentrate, and cobalt-sulfur crude concentrate is described.

[0045] like Figure 3 As shown, coarse-grained titanium selection of coarse-grained titanium raw materials may include steps S300~S370.

[0046] S300. Feed the coarse-grained titanium raw material into a coarse-grained screen to obtain the material above the coarse-grained screen and the material below the coarse-grained screen.

[0047] S310. The material on the coarse screen is subjected to titanium-selective grinding to obtain titanium-selective grinding discharge, which is then returned to the coarse screen.

[0048] S320. The coarse particles under the coarse screen are subjected to coarse particle de-ironing, coarse particle strong magnetic separation and gravity separation in sequence to obtain gravity concentrate and gravity tailings.

[0049] Specifically, the coarse-grained undersize material is subjected to primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings. The primary iron removal concentrate is used as feed for three-stage weak magnetic separation. The primary iron removal tailings are subjected to primary strong magnetic separation to obtain primary strong magnetic concentrate. The primary strong magnetic concentrate is subjected to gravity separation to obtain gravity concentrate and gravity tailings.

[0050] S330. Perform strong magnetic treatment on the gravity separation tailings to obtain strong magnetic concentrate of gravity separation tailings.

[0051] S340. The gravity concentrate is fed into the hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow.

[0052] S350. Perform titanium-selective two-stage grinding on the hydrocyclone underflow to obtain titanium-selective two-stage grinding discharge, and return the titanium-selective two-stage grinding discharge to the hydrocyclone.

[0053] S360. Feed the overflow from the hydrocyclone into the coarse high-frequency fine screen to obtain the coarse high-frequency fine screen undersize material and the coarse high-frequency fine screen oversize material.

[0054] The coarse-grained high-frequency fine screen oversize is fed into a hydrocyclone, and then fed into the flotation process described in step S370.

[0055] S370. The coarse-grained high-frequency fine screen undersize material is subjected to coarse-grained two-stage iron removal. The coarse-grained two-stage iron removal tailings are concentrated and then fed into floating sulfur and floating titanium in sequence to obtain cobalt sulfur crude concentrate and coarse-grained titanium concentrate.

[0056] Specifically, the coarse-grained undersize material from the high-frequency fine screen is fed into the coarse-grained secondary de-ironization stage to obtain coarse-grained secondary de-ironization concentrate and coarse-grained secondary de-ironization tailings. The coarse-grained secondary de-ironization concentrate is then fed into the third-stage weak magnetic separation stage. The coarse-grained secondary de-ironization tailings are concentrated, and the concentrated coarse-grained secondary de-ironization tailings are subjected to sulfur flotation and titanium flotation in sequence to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate.

[0057] In the above coarse-particle titanium selection scheme, a linear screen with a screen aperture size of 0.8 mm to 1.5 mm can be used for coarse particle screening. The screen aperture size of the high-frequency fine screen for coarse particles is 0.08 mm to 0.20 mm. A flat-bottomed hydrocyclone is used for titanium selection.

[0058] In the above coarse titanium beneficiation scheme, ball mills are used for both the first-stage and second-stage grinding of titanium beneficiation.

[0059] In the above coarse titanium separation scheme, both the first-stage and second-stage coarse iron removal adopt a counter-current drum magnetic separator with a magnetic field strength of 2500Gs to 4000Gs.

[0060] In the above coarse-grained titanium beneficiation scheme, both the strong magnetic field of the first stage of coarse-grained titanium beneficiation and the strong magnetic field of the gravity separation tailings adopt vertical ring strong magnetic fields. The magnetic field strength of the strong magnetic field of the first stage of coarse-grained titanium beneficiation is 5000Gs~12000Gs, and the magnetic field strength of the strong magnetic field of the gravity separation tailings is 6000Gs~12000Gs.

[0061] In the above coarse-grained titanium selection scheme, gravity separation is carried out using a φ900mm or φ1200mm spiral chute.

[0062] In the aforementioned coarse-grained titanium beneficiation scheme, this invention employs a secondary coarse grinding process on the coarse-grained titanium beneficiation feedstock. The coarse undersize material is fed into subsequent titanium beneficiation processes, preventing coarse particles or impurities from clogging the high-intensity magnetic separator in these processes. The coarse oversize material is fed into the primary titanium beneficiation grinding stage for further grinding and then returned to the process, further improving titanium recovery. This avoids the direct disposal of coarse particles, preventing the loss of titanium resources. By using the coarse-grained primary and secondary iron-removing concentrates as iron beneficiation feedstock and returning it to the third-stage hydrocyclone in the multi-stage weak magnetic separation process, iron recovery is further improved. The aforementioned coarse-grained titanium beneficiation utilizes a "high-intensity magnetic separation + gravity separation" process. High-intensity magnetic separation ensures titanium recovery, while gravity separation improves the grade of the flotation ore, thereby effectively increasing titanium recovery and reducing flotation reagent consumption. The aforementioned coarse-grained titanium beneficiation method utilizes strong magnetic fields to recover unrecoverable fine-grained ilmenite encrusted in gravity separation tailings. The resulting strong magnetic concentrate from the gravity separation tailings serves as raw material for fine-grained titanium beneficiation. This approach effectively improves titanium recovery rate and grade. Furthermore, by raising the grade of titanium resources (TiO2) in the gravity separation tailings to a certain level, it can be combined with the iron tailings from the second, third, and fourth stages of iron separation. This prevents the titanium resources (TiO2) in the iron tailings from being depleted, while also simplifying the subsequent fine-grained titanium beneficiation process. Only one stage of strong magnetic flotation is required in the fine-grained titanium beneficiation process, significantly simplifying the process and reducing operating costs. In summary, this invention significantly improves the recovery rate and grade of iron and titanium resources in vanadium-titanium magnetite by adopting a process flow of coarse-grained coarse-grinding-iron removal-strong magnetic separation-gravity separation-cyclone classification-grinding-coarse-grained high-frequency fine screening-iron removal-flotation, reduces flotation reagent consumption, simplifies the fine-grained titanium beneficiation process, and lowers operating costs.

[0063] The following is combined Figure 2 The above-described process for coarse-grained titanium selection is explained.

[0064] like Figure 2 As shown, in this embodiment, the coarse-grained titanium beneficiation feedstock includes a first stage of weakly magnetic tailings. The first fine-grained titanium beneficiation feedstock includes a second stage of weakly magnetic tailings, a third stage of weakly magnetic tailings, and a fourth stage of weakly magnetic tailings. The coarse-grained titanium beneficiation process is as follows: 1) The coarse-grained titanium raw material is fed into the coarse-grained separator. The material on the coarse-grained separator screen (and the material on the fine-grained separator screen) is fed into the titanium beneficiation stage grinding. The titanium beneficiation stage grinding discharge is returned to the coarse-grained separator.

[0065] 2) The coarse-grained material passing through the coarse screen is fed into the coarse-grained primary iron removal stage to obtain coarse-grained primary iron removal concentrate and coarse-grained primary iron removal tailings.

[0066] 3) Feed the coarse-grained first-stage iron removal tailings into the coarse-grained first-stage strong magnetic field to obtain the coarse-grained first-stage strong magnetic concentrate and tailings.

[0067] 4) The coarse-grained first-stage strong magnetic concentrate is fed into gravity separation to obtain gravity concentrate, gravity medium and gravity tailings. The gravity tailings are fed into gravity tailings strong magnetic separation to obtain gravity tailings strong magnetic concentrate and tailings. The gravity medium and gravity tailings strong magnetic tailings enter the total tailings. The gravity tailings strong magnetic concentrate enters the fine-grained titanium beneficiation.

[0068] 5) The gravity concentrate is fed into the hydrocyclone, the hydrocyclone underflow is fed into the titanium beneficiation stage II grinding mill, and the titanium beneficiation stage II grinding mill returns to the hydrocyclone. The hydrocyclone overflow is fed into a coarse high-frequency fine screen, and the oversize material from the coarse high-frequency fine screen (and the oversize material from the fine high-frequency fine screen) is returned to the hydrocyclone.

[0069] 6) The coarse high-frequency fine screen undersize material is fed into the coarse secondary de-ironization stage to obtain coarse secondary de-ironization concentrate and coarse secondary de-ironization tailings.

[0070] 7) After the coarse-grained two-stage iron removal tailings are concentrated, they are successively fed into floating sulfur and floating titanium to obtain cobalt sulfur concentrate and coarse-grained titanium concentrate.

[0071] In the aforementioned coarse-grained titanium beneficiation scheme, this invention employs a secondary coarse grinding process on the coarse-grained titanium beneficiation feedstock. The coarse undersize material is fed into subsequent titanium beneficiation processes, preventing coarse particles or impurities from clogging the high-intensity magnetic separator in these processes. The coarse oversize material is fed into the primary titanium beneficiation grinding stage for further grinding and then returned to the process, further improving titanium recovery. This avoids the direct disposal of coarse particles, preventing the loss of titanium resources. By using the coarse-grained primary and secondary iron-removing concentrates as iron beneficiation feedstock and returning it to the third-stage hydrocyclone in the multi-stage weak magnetic separation process, iron recovery is further improved. The aforementioned coarse-grained titanium beneficiation utilizes a "high-intensity magnetic separation + gravity separation" process. High-intensity magnetic separation ensures titanium recovery, while gravity separation improves the grade of the flotation ore, thereby effectively increasing titanium recovery and reducing flotation reagent consumption. The aforementioned coarse-grained titanium beneficiation method utilizes strong magnetic fields to recover unrecoverable fine-grained ilmenite encrusted in gravity separation tailings. The resulting strong magnetic concentrate from the gravity separation tailings serves as raw material for fine-grained titanium beneficiation. This approach effectively improves titanium recovery rate and grade. Furthermore, by raising the grade of titanium resources (TiO2) in the gravity separation tailings to a certain level, it can be combined with the iron tailings from the second, third, and fourth stages of iron separation. This prevents the titanium resources (TiO2) in the iron tailings from being depleted, while also simplifying the subsequent fine-grained titanium beneficiation process. Only one stage of strong magnetic flotation is required in the fine-grained titanium beneficiation process, significantly simplifying the process and reducing operating costs. In summary, this invention significantly improves the recovery rate and grade of iron and titanium resources in vanadium-titanium magnetite by adopting a process flow of coarse-grained coarse-grinding-iron removal-strong magnetic separation-gravity separation-cyclone classification-grinding-coarse-grained high-frequency fine screening-iron removal-flotation, reduces flotation reagent consumption, simplifies the fine-grained titanium beneficiation process, and lowers operating costs.

[0072] In some embodiments of the present invention, the process of fine-grained titanium beneficiation of the first and second fine-grained titanium beneficiation raw materials to obtain cobalt-sulfur crude concentrate and fine-grained titanium concentrate includes: feeding the first and second fine-grained titanium beneficiation raw materials into a fine-grained coarse screen to obtain fine-grained coarse screen undersize material; and sequentially subjecting the fine-grained coarse screen undersize material to fine-grained primary iron removal, fine-grained strong magnetic separation, fine-grained strong magnetic scavenging, fine-grained high-frequency fine screening, fine-grained secondary iron removal, and tailings concentration to obtain cobalt-sulfur crude concentrate and fine-grained titanium concentrate.

[0073] Specifically, the first and second fine-grained titanium raw materials can be concentrated, and the concentrated titanium raw materials can be fed into a fine-grained coarse screen to obtain the fine-grained coarse screen undersize. The fine-grained coarse screen undersize is then subjected to fine-grained primary iron removal, fine-grained strong magnetic separation, fine-grained strong magnetic scavenging, fine-grained high-frequency fine screening, fine-grained secondary iron removal, and tailings concentration to obtain cobalt-sulfur crude concentrate and fine / ultrafine mixed titanium concentrate.

[0074] The above-mentioned fine-particle titanium beneficiation process improves titanium recovery by using coarse grinding on the fine-particle titanium beneficiation raw material. This process grinds the coarse minerals entering the titanium beneficiation process and returns them to the process, thereby avoiding the blockage of the strong magnetic separator in the subsequent process by coarse particles or impurities, as well as the loss of titanium resources caused by the direct disposal of coarse particles. By sequentially processing the fine-particle undersize material through fine-particle primary iron removal, fine-particle strong magnetic separation, fine-particle strong magnetic scavenging, fine-particle high-frequency fine screening, fine-particle secondary iron removal, and tailings concentration, cobalt-sulfur crude concentrate and fine-particle titanium concentrate are obtained, improving the recovery rate and grade of titanium concentrate.

[0075] Combination Figure 2 and Figure 4 The specific process of fine-grained titanium beneficiation of the first and second fine-grained titanium feedstocks to obtain cobalt sulfide crude concentrate and fine-grained titanium concentrate is described.

[0076] like Figure 4 As shown, the process of fine-grained titanium selection of the first and second fine-grained titanium raw materials may include steps S400 to S490.

[0077] S400: The first fine-particle titanium raw material and the second fine-particle titanium raw material are fed into the fine-particle coarse screen to obtain the undersize and oversize of the fine-particle coarse screen.

[0078] S410. Feed the material from the fine-particle coarse screen into the first-stage grinding process of titanium beneficiation in the coarse-particle titanium beneficiation process.

[0079] S420. The fine-grained material under the coarse screen is subjected to a first-stage iron removal process to obtain a first-stage iron removal concentrate and a first-stage iron removal tailings.

[0080] S430, The fine-grained first-stage de-iron concentrate is fed into the third stage of the multi-stage weak magnetic beneficiation process.

[0081] S440. Fine-grained strong magnetic treatment is performed on the fine-grained first-stage iron removal tailings to obtain fine-grained strong magnetic concentrate and fine-grained strong magnetic tailings.

[0082] S450. Fine-grained strong magnetic tailings are subjected to fine-grained strong magnetic scavenging to obtain fine-grained strong magnetic scavenging concentrate.

[0083] S460. Fine-grained strong magnetic concentrate and fine-grained strong magnetic scavenging concentrate are fed together into a fine-grained high-frequency fine screen to obtain fine-grained high-frequency fine screen undersize and fine-grained high-frequency fine screen oversize.

[0084] The fine-particle high-frequency fine screen oversize is fed into the titanium beneficiation stage two grinding, and the fine-particle high-frequency fine screen undersize is processed in subsequent processes.

[0085] S470. Fine-grained high-frequency fine screen undersize material is subjected to two-stage iron removal to obtain fine-grained two-stage iron removal concentrate and tailings.

[0086] S480, The fine-grained two-stage de-ironized concentrate is fed into the three-stage weak magnetic separation process in the multi-stage weak magnetic separation process.

[0087] S490. After concentrating the fine-grained two-stage iron removal tailings, feed them sequentially with floating sulfur and floating titanium to obtain cobalt sulfur rough concentrate and fine / ultrafine mixed titanium concentrate.

[0088] In the above-mentioned fine-particle titanium selection scheme, a linear screen with a screen aperture size of 0.8 mm to 1.5 mm can be used as the coarse-grained screen. The screen aperture size of the high-frequency fine-particle screen is 0.08 mm to 0.20 mm. A flat-bottomed hydrocyclone is used for titanium selection.

[0089] In the above-mentioned fine-particle titanium separation scheme, both the first-stage and second-stage fine-particle iron removal adopt a counter-current drum magnetic separator with a magnetic field strength of 2500Gs to 4000Gs.

[0090] In the above coarse-grain titanium selection scheme, both fine-grain strong magnetic and fine-grain strong magnetic sweeping adopt vertical ring strong magnetic fields, with the magnetic field strength of the fine-grain strong magnetic field being 5000Gs~12000Gs and the magnetic field strength of the fine-grain strong magnetic sweeping being 6000Gs~12000Gs.

[0091] In the aforementioned fine-particle titanium beneficiation scheme, this invention improves titanium recovery by separating the coarse particles from the fine-particle titanium beneficiation feedstock. The material passing through the coarse-particle screen is then fed into the first-stage grinding mill for further grinding before being returned to the process. This avoids the direct disposal of coarse particles, preventing the loss of titanium resources. Feeding the material passing through the coarse-particle screen into subsequent titanium beneficiation processes avoids clogging of the high-intensity magnetic separator by coarse particles or impurities and also prevents over-grinding of the fine-particle titanium beneficiation feedstock. Specifically, some of the feedstock for fine-particle titanium beneficiation comes from iron tailings from the second, third, and fourth stages of iron beneficiation. These tailings, especially those from the third and fourth stages, already contain particles of the required flotation size. Feeding these particles directly into the subsequent titanium beneficiation process instead of grinding effectively prevents over-grinding and improves titanium recovery. This fine-particle titanium beneficiation scheme requires only one stage of high-intensity magnetic separation for fine-particle flotation, greatly simplifying the process and reducing operating costs. The aforementioned fine-particle titanium beneficiation scheme further improves iron recovery by using the fine-particle first- and second-stage iron-removing concentrate as raw material for iron beneficiation and returning it to the third-stage hydrocyclone in the multi-stage weak magnetic beneficiation process. This scheme also improves titanium recovery by feeding the oversize material from the fine-particle high-frequency fine screen into the second-stage titanium beneficiation grinding and classification system, rationally dividing it into flotation particle size ranges to achieve coarse and fine particle separation, effectively improving titanium recovery and reducing flotation reagent consumption. This invention significantly improves the recovery rate and grade of iron and titanium resources in vanadium-titanium magnetite through the above scheme, reduces flotation reagent consumption, and features a simple fine-particle titanium beneficiation process with low operating costs.

[0092] The following is combined Figure 2 The above-described process for selecting titanium particles is explained.

[0093] like Figure 2 As shown, the fine-grained titanium selection process is as follows: 1) After concentrating the fine / ultrafine titanium raw materials (and gravity separation tailings strong magnetic concentrate), feed them into the fine coarse screen. The material on the fine coarse screen is then fed into the first stage of titanium beneficiation grinding.

[0094] 2) The material passing through the coarse screen of the fine particles is fed into the first stage of fine particle de-ironization to obtain the first stage of fine particle de-ironization concentrate and the first stage of fine particle de-ironization tailings.

[0095] 3) The fine-grained first-stage de-iron tailings are fed into a fine-grained strong magnetic field to obtain fine-grained strong magnetic concentrate and tailings.

[0096] 4) Feed the fine-grained strong magnetic tailings into the fine-grained strong magnetic scavenging process to obtain fine-grained strong magnetic scavenging concentrate and scavenging tailings.

[0097] 5) The fine-grained strong magnetic concentrate and the fine-grained strong magnetic scavenging concentrate are fed together into the fine-grained high-frequency fine screen, and the material on the fine-grained high-frequency fine screen is fed into the titanium beneficiation stage two grinding.

[0098] 6) The undersize material from the fine high-frequency fine screen is fed into the fine-particle secondary de-ironization stage to obtain fine-particle secondary de-ironization concentrate and fine-particle secondary de-ironization tailings.

[0099] 7) After concentrating the fine-grained two-stage iron removal tailings, feed them sequentially with floating sulfur and floating titanium to obtain cobalt sulfur rough concentrate and fine / ultrafine mixed titanium concentrate.

[0100] 8) The coarse-grained iron concentrate from the first and second stages of iron removal and the fine-grained iron concentrate from the first and second stages of iron removal are returned to the third stage hydrocyclone of iron beneficiation as part of the raw materials for iron beneficiation.

[0101] 9) The cobalt-sulfur concentrate obtained from coarse-grained titanium flotation and fine-grained titanium flotation is further refined and separated to obtain sulfur concentrate and cobalt-nickel concentrate.

[0102] In the aforementioned fine-particle titanium beneficiation scheme, this invention improves titanium recovery by separating the coarse particles from the fine-particle titanium beneficiation feedstock. The material passing through the coarse-particle screen is then fed into the first-stage grinding mill for further grinding before being returned to the process. This avoids the direct disposal of coarse particles, preventing the loss of titanium resources. Feeding the material passing through the coarse-particle screen into subsequent titanium beneficiation processes avoids clogging of the high-intensity magnetic separator by coarse particles or impurities and also prevents over-grinding of the fine-particle titanium beneficiation feedstock. Specifically, some of the feedstock for fine-particle titanium beneficiation comes from iron tailings from the second, third, and fourth stages of iron beneficiation. These tailings, especially those from the third and fourth stages, already contain particles of the required flotation size. Feeding these particles directly into the subsequent titanium beneficiation process instead of grinding effectively prevents over-grinding and improves titanium recovery. This fine-particle titanium beneficiation scheme requires only one stage of high-intensity magnetic separation for fine-particle flotation, greatly simplifying the process and reducing operating costs. The aforementioned fine-particle titanium beneficiation scheme further improves iron recovery by using the fine-particle first- and second-stage iron-removing concentrate as raw material for iron beneficiation and returning it to the third-stage hydrocyclone in the multi-stage weak magnetic beneficiation process. This scheme also improves titanium recovery by feeding the oversize material from the fine-particle high-frequency fine screen into the second-stage titanium beneficiation grinding and classification system, rationally dividing it into flotation particle size ranges to achieve coarse and fine particle separation, effectively improving titanium recovery and reducing flotation reagent consumption. This invention significantly improves the recovery rate and grade of iron and titanium resources in vanadium-titanium magnetite through the above scheme, reduces flotation reagent consumption, and features a simple fine-particle titanium beneficiation process with low operating costs.

[0103] The following describes the concept of the present invention in conjunction with a specific beneficiation process of vanadium-titanium magnetite. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0104] This embodiment uses vanadium-titanium magnetite from a mine in the Panxi region. The crushed particle size of this vanadium-titanium magnetite is -20mm, the TFe grade is 23.46%, and the TiO2 grade is 8.51%. The specific steps and process parameters are as follows: 1) The first stage of grinding adopts an overflow ball mill, the first stage of grinding and classification adopts a linear screen with a screen size of 1.2mm, and the first stage of weak magnetic separation adopts a counter-current drum magnetic separator with a magnetic field strength of 3000Gs, to obtain the first stage of weak magnetic separation concentrate and the first stage of weak magnetic separation tailings.

[0105] 2) The two-stage grinding adopts an overflow ball mill, and the two-stage weak magnetic separation adopts a semi-countercurrent drum magnetic separator with a magnetic field strength of 2500GS, to obtain the two-stage weak magnetic separation concentrate and the two-stage weak magnetic separation tailings.

[0106] 4) The three-stage grinding uses a tower mill, the three-stage weak magnetic separation I uses a semi-countercurrent drum magnetic separator with a magnetic field strength of 3000GS, and the three-stage weak magnetic separation II uses a semi-countercurrent drum magnetic separator with a magnetic field strength of 2500GS, to obtain three-stage iron concentrate and three-stage weak magnetic separation I tailings and three-stage weak magnetic separation II tailings.

[0107] 5) The four-stage grinding uses a tower mill with a high-frequency fine screen aperture of 0.1mm. The four-stage weak magnetic separation I uses a semi-countercurrent drum magnetic separator with a magnetic field strength of 2000GS. The four-stage weak magnetic separation II uses a semi-countercurrent drum magnetic separator with a magnetic field strength of 1500GS. The resulting iron concentrate from the four-stage grinding process and the tailings from the four-stage weak magnetic separation I and the four-stage weak magnetic separation II processes are obtained.

[0108] 6) The tailings from the first stage of weak magnetic separation are fed into the coarse titanium separation. The screen size of the coarse linear screen is 1.2 mm. The first stage of titanium separation is ground using an overflow ball mill. The first stage of coarse-grained iron removal uses a counter-current drum magnetic separator with a magnetic field strength of 3500 Gs. The first stage of coarse-grained strong magnetic separation uses a vertical ring strong magnetic separator with a magnetic field strength of 8000 Gs. The resulting coarse-grained iron removal concentrate, coarse-grained strong magnetic concentrate, and coarse-grained strong magnetic tailings are obtained.

[0109] 7) The gravity separation adopts a Φ900 spiral chute and uses an internal process of "one roughing, two cleaning, and two scavenging". The products of each process are concentrate, middlings and tailings. The concentrate from the roughing and cleaning processes enters the next process, the tailings return to the previous process in sequence, the middlings return to their respective processes, the concentrate from scavenging I returns to the roughing process, the tailings enter scavenging II, the middlings return to the process, the concentrate from scavenging II returns to scavenging I, the middlings from scavenging II enter the total tailings, and the tailings from scavenging II enter the gravity separation tailings strong magnetic field.

[0110] 8) The strong magnetic separation of gravity tailings is carried out using a vertical ring strong magnetic machine with a magnetic field strength of 10000Gs to obtain strong magnetic concentrate and strong magnetic tailings of gravity tailings. The strong magnetic concentrate of gravity tailings enters the fine titanium separation process, and the strong magnetic tailings of gravity tailings enter the total tailings.

[0111] 9) The titanium beneficiation stage two grinding uses an overflow ball mill with a high-frequency fine screen with a screen size of 0.1 mm. The coarse-grained stage two iron removal uses a counter-current drum magnetic separator with a magnetic field strength of 3500 Gs to obtain coarse-grained stage two iron removal concentrate and coarse-grained stage two iron removal tailings.

[0112] 10) After the coarse-grained two-stage iron removal tailings are concentrated, they are fed into the flotation of sulfur and titanium. An aerated mechanical stirring flotation machine is used. The flotation of sulfur adopts "one roughing and two scavenging", and the flotation of titanium adopts "one roughing, four cleaning and two scavenging" to obtain cobalt sulfur concentrate, coarse titanium concentrate and coarse flotation tailings.

[0113] 11) The tailings from the two-stage weak magnetic separation, the three-stage weak magnetic separation I tailings, the three-stage weak magnetic separation II tailings, the four-stage weak magnetic separation I tailings, and the four-stage weak magnetic separation II tailings (and the strong magnetic concentrate from the gravity separation tailings) are concentrated and then fed together into the fine / ultrafine titanium separation process. The fine particle coarse linear screen has a screen size of 1.2 mm. The first-stage iron removal of the fine particles uses a counter-current drum magnetic separator with a magnetic field strength of 3500 Gs. The strong magnetic separation of the fine particles uses a vertical ring strong magnetic separator with a magnetic field strength of 10000 Gs. The strong magnetic scavenging of the fine particles uses a vertical ring strong magnetic separator with a magnetic field strength of 13000 Gs. This yields the first-stage iron removal concentrate, the strong magnetic concentrate, the strong magnetic scavenging concentrate, and the strong magnetic tailings.

[0114] 12) The fine-particle high-frequency fine screen has a screen aperture size of 0.1 mm. The fine-particle secondary iron removal adopts a counter-current drum magnetic separator with a magnetic field strength of 3500 Gs to obtain fine-particle secondary iron removal concentrate and fine-particle secondary iron removal tailings.

[0115] 13) After the fine-grained two-stage iron removal tailings are concentrated, they enter the sulfur and titanium flotation processes, using an 8m... 3 The pneumatic mechanical agitation flotation machine uses "one roughing and two scavenging" for sulfur flotation and "one roughing, four cleaning and two scavenging" for sulfur flotation, to obtain cobalt sulfur concentrate, fine / ultrafine titanium concentrate and fine flotation tailings.

[0116] 14) The sulfur-cobalt rough concentrate is processed by an aerated mechanical stirring flotation machine. Through "selection and separation" flotation, sulfur concentrate and cobalt-nickel concentrate are obtained.

[0117] 15) Coarse-grained iron concentrate from the first and second stages of iron removal and fine-grained iron concentrate from the first and second stages of iron removal are returned to the third stage hydrocyclone for iron beneficiation as raw materials.

[0118] The specific indicators of this embodiment are shown in Table 1: Table 1

[0119] The technical effects of the technical solution in this embodiment are as follows: 1) The grinding particle size of the first and second stages of iron beneficiation is coarsened to prevent over-grinding of tailings and to create suitable material particle size conditions for subsequent titanium beneficiation; the third and fourth stages are finely ground to ensure the grade of iron concentrate; a weak magnetic separation process is set in the discharge of the third and fourth stages of grinding to remove some tailings in advance and further prevent over-grinding of tailings.

[0120] 2) Returning the coarse-grained iron concentrate from the first and second stages of iron removal and the fine-grained iron concentrate from the first and second stages of iron removal to the third stage hydrocyclone for iron beneficiation as raw materials can effectively improve the iron recovery rate.

[0121] 3) Use the iron tailings from the first stage of iron ore beneficiation as coarse titanium feedstock, and the iron tailings from the second, third, and fourth stages of iron ore beneficiation as fine / ultrafine titanium feedstock. By classifying the feedstocks and rationally dividing them into flotation particle size ranges, the flotation effect can be effectively guaranteed and the recovery rate of titanium concentrate can be improved.

[0122] 4) Coarse and fine / ultrafine titanium beneficiation feedstocks are separated by grinding. Coarse minerals entering the titanium beneficiation process are ground and returned to the process, improving titanium recovery rate. The original process either did not separate the coarse particles, causing coarse particles or impurities to clog the high-intensity magnetic separator in the subsequent process, or the material on the coarse screen was discarded, resulting in the loss of titanium resources.

[0123] 5) The coarse titanium beneficiation adopts the process of "strong magnetic separation + gravity separation + flotation". Strong magnetic separation ensures the recovery rate, gravity separation improves the grade of the raw ore, which can effectively improve the titanium recovery rate and reduce the consumption of flotation reagents.

[0124] In the coarse-grained titanium beneficiation process, the unrecoverable fine-grained ilmenite mixed in the gravity separation tailings is recovered using strong magnetic concentrators. The resulting strong magnetic concentrate from the gravity separation tailings is used as raw material for fine-grained titanium beneficiation. On the one hand, this effectively improves the titanium recovery rate and grade. On the other hand, after the grade of titanium resources (TiO2) in the gravity separation tailings is increased to a certain level, it can be combined with the iron tailings from the second, third, and fourth stages of iron separation. This can prevent the grade of titanium resources (TiO2) in the iron tailings from the second, third, and fourth stages of iron separation from being depleted. At the same time, it simplifies the subsequent fine-grained titanium beneficiation process, which only requires one stage of strong magnetic flotation. This greatly simplifies the fine-grained titanium beneficiation process and reduces operating costs.

[0125] 6) For fine-grained ilmenite mixed in the gravity separation tailings that cannot be recovered by the gravity separation process, strong magnetic field is used for recovery, and then the residue is returned to the fine-grained titanium separation process, which can effectively improve the titanium recovery rate.

[0126] 7) The oversize material from the fine high-frequency fine screen is fed into the titanium beneficiation two-stage grinding and classification system to reasonably divide the flotation particle size range, realize the separation of coarse and fine particles, and effectively improve the titanium recovery rate and reduce the consumption of flotation reagents.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for beneficiating vanadium-titanium magnetite, characterized in that, include: Multi-stage weak magnetic beneficiation was performed on the crushed vanadium-titanium magnetite to obtain vanadium-titanium iron concentrate, coarse-grained titanium beneficiation raw material and first fine-grained titanium beneficiation raw material. The coarse-grained titanium raw material is subjected to coarse-grained titanium beneficiation to obtain a second fine-grained titanium raw material, coarse-grained titanium concentrate, and cobalt sulfide concentrate. The first and second fine-particle titanium raw materials are subjected to fine-particle titanium beneficiation to obtain cobalt sulfide crude concentrate and fine-particle titanium concentrate. Sulfur concentrate and cobalt-nickel concentrate are separated from coarse-grained titanium beneficiation concentrate and fine-grained titanium beneficiation concentrate, respectively.

2. The method according to claim 1, characterized in that, Multi-stage weak magnetic beneficiation of crushed vanadium-titanium magnetite yields coarse-grained titanium-beneficiary feedstock and a first fine-grained titanium-beneficiary feedstock, including: The crushed vanadium-titanium magnetite is subjected to four stages of weak magnetic beneficiation in sequence, yielding weak magnetic tailings in stages one, two, three, and four, and vanadium-titanium iron concentrate. The weak magnetic tailings in stage one are the coarse-grained titanium beneficiation raw materials, and the weak magnetic tailings in stages two, three, and four are the fine-grained titanium beneficiation raw materials.

3. The method according to claim 2, characterized in that, The process of coarse-grained titanium beneficiation of the coarse-grained titanium feedstock to obtain a second fine-grained titanium feedstock, coarse-grained titanium concentrate, and cobalt-sulfur crude concentrate includes: The coarse-grained titanium raw material is fed into a coarse-grained screen to obtain the coarse-grained undersize material. The coarse-grained undersize material is subjected to coarse-grained deironing, coarse-grained strong magnetic separation, and gravity separation in sequence to obtain gravity concentrate and gravity tailings. The gravity separation tailings are subjected to strong magnetic separation to obtain strong magnetic gravity separation tailings concentrate, wherein the strong magnetic gravity separation tailings concentrate is a second fine-grained titanium beneficiation raw material. The gravity concentrate is fed into a hydrocyclone to obtain hydrocyclone overflow; The overflow from the hydrocyclone is fed into a coarse high-frequency fine screen to obtain the coarse high-frequency fine screen undersize material. The coarse-grained undersize material from the high-frequency fine screen is subjected to two-stage iron removal and tailings concentration to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate.

4. The method according to claim 3, characterized in that, The coarse-grained undersize material is subjected to a first-stage iron removal process, a first-stage strong magnetic separation process, and gravity separation to obtain gravity concentrate and gravity tailings, including: The coarse-grained undersize material is subjected to primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings. The primary iron removal concentrate is used to feed into the three-stage weak magnetic separation process. The coarse-grained first-stage iron removal tailings were subjected to strong magnetic treatment to obtain a strong magnetic concentrate. Gravity separation is performed on the coarse-grained primary magnetic concentrate to obtain gravity concentrate and gravity tailings; The coarse-grained undersize material from the high-frequency fine screen is subjected to two-stage coarse-grained iron removal and tailings concentration to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate, comprising: The coarse-grained high-frequency fine screen undersize material is fed into the coarse-grained secondary iron removal stage to obtain coarse-grained secondary iron removal concentrate and coarse-grained secondary iron removal tailings. The coarse-grained secondary iron removal concentrate is used to feed into the third stage weak magnetic separation. The coarse-grained two-stage iron removal tailings are concentrated, and the concentrated coarse-grained two-stage iron removal tailings are subjected to sulfur flotation and titanium flotation in sequence to obtain cobalt-sulfur crude concentrate and coarse-grained titanium concentrate.

5. The method according to claim 3, characterized in that, The coarse-grained titanium raw material is fed into a coarse-grained screen to obtain the coarse-grained undersize material, which includes: The coarse-grained titanium raw material is fed into a coarse-grained screen to obtain the material above the coarse-grained screen and the material below the coarse-grained screen. The material on the coarse screen is subjected to titanium-selective grinding to obtain titanium-selective grinding discharge, which is then returned to the coarse screen.

6. The method according to claim 3, characterized in that, The gravity concentrate is fed into a hydrocyclone, and the resulting hydrocyclone overflow includes: The gravity concentrate is fed into a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow; The underflow from the hydrocyclone is subjected to a two-stage titanium-selective grinding process to obtain a titanium-selective grinding discharge, which is then returned to the hydrocyclone.

7. The method according to claim 2, characterized in that, The step of performing fine-grained titanium beneficiation on the first and second fine-grained titanium raw materials to obtain cobalt sulfide crude concentrate and fine-grained titanium concentrate includes: The first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are fed into a fine-particle coarse screen to obtain the fine-particle coarse screen undersize material; The fine-grained undersize material is subjected to a series of processes, including primary iron removal, high-intensity magnetic separation, high-intensity magnetic sweeping, high-frequency fine screening, secondary iron removal, and tailings concentration, to obtain cobalt-sulfur crude concentrate and fine-grained titanium concentrate.

8. The method according to claim 7, characterized in that, The fine-grained undersize material is subjected to a series of processes including primary iron removal, high-intensity magnetic separation, high-intensity magnetic scavenging, high-frequency fine screening, secondary iron removal, and tailings concentration to obtain cobalt-sulfur concentrate and fine-grained titanium concentrate, comprising: The fine-grained undersize material is subjected to primary iron removal to obtain primary iron removal tailings. The fine-grained first-stage iron-removing tailings were subjected to fine-grained strong magnetic treatment to obtain fine-grained strong magnetic concentrate and fine-grained strong magnetic tailings. Fine-grained strong magnetic tailings are subjected to fine-grained strong magnetic scavenging to obtain fine-grained strong magnetic scavenging concentrate; The fine-grained strong magnetic concentrate and the fine-grained strong magnetic scavenging concentrate are fed together into a fine-grained high-frequency fine screen to obtain the fine-grained high-frequency fine screen undersize. The fine-particle high-frequency fine screen undersize material is subjected to two-stage iron removal to obtain fine-particle two-stage iron removal tailings; The fine-grained two-stage iron removal tailings are concentrated and then fed sequentially with floating sulfur and floating titanium to obtain cobalt sulfur rough concentrate and fine / ultrafine mixed titanium concentrate.

9. The method according to claim 8, characterized in that, Also includes: The fine-grained iron-de-iron concentrate obtained by fine-grained coarse screen undersize material is fed into the three-stage weak magnetic separation. The fine-grained two-stage de-ironized concentrate obtained by fine-grained high-frequency fine screen undersize material is fed into the three-stage weak magnetic separation. The fine particles obtained from the high-frequency fine screen are fed into the titanium beneficiation stage two grinding process.

10. The method according to claim 7, characterized in that, The first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are fed into a fine-particle coarse screen to obtain the undersize material, which includes: The first fine-particle titanium-selected raw material and the second fine-particle titanium-selected raw material are concentrated and then fed into a fine-particle coarse screen to obtain the material above the fine-particle coarse screen and the material below the fine-particle coarse screen. The fine particles from the coarse screen are fed into the titanium-selective grinding stage.

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