Iron-titanium separation method for high-speed, high-titanium vanadium-titanium magnetite

Abstract

This invention discloses a method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite, belonging to the field of mineral processing technology. To achieve the rational utilization of high-iron, high-titanium vanadium-titanium magnetite, this invention provides a method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite, comprising: crushing the high-iron, high-titanium vanadium-titanium magnetite to obtain crushed products; subjecting the crushed products to a first-stage grinding and magnetic separation to obtain magnetic concentrate 1 and tailings 1; subjecting magnetic concentrate 1 to a second-stage grinding and magnetic separation to obtain iron concentrate and tailings 2; combining tailings 1 and tailings 2 for screening and classification, and separately performing gravity separation on coarse and fine iron tailings to obtain titanium rough concentrate; finally, performing a three-stage high-intensity magnetic separation to obtain titanium concentrate. This invention employs a two-stage grinding and two-stage magnetic separation process, improving grinding efficiency, reducing over-grinding rate, separating tailings into coarse and fine particle sizes, improving gravity separation effect, and increasing yield while ensuring the grade of iron concentrate and titanium concentrate.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically relating to a method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite. Background Technology

[0002] Vanadium-titanium magnetite, a mineral resource rich in iron, titanium, and vanadium, is widely distributed globally, with world reserves reaching 40 billion tons. The characteristics of vanadium-titanium magnetite resources vary across countries and regions, leading to different comprehensive utilization methods. Iron beneficiation processes often involve staged grinding and staged iron separation, while common titanium beneficiation processes include high-intensity magnetic separation-flotation, spiral sluice gravity separation-electrostatic separation, spiral sluice gravity separation-high-intensity magnetic separation-flotation, and high-intensity magnetic separation-gravity separation. The titanium beneficiation process is generally selected based on the specific ore properties and the desired quality of the produced titanium concentrate.

[0003] Compared to ordinary vanadium-titanium magnetite, high-iron, high-titanium vanadium-titanium magnetite has a much higher iron and titanium content, which may lead to problems such as difficulty in grinding and separation during the beneficiation process. This results in low iron-titanium separation efficiency and low grades and yields of iron and titanium concentrates. Therefore, it is necessary to develop a beneficiation process specifically for high-iron, high-titanium vanadium-titanium magnetite. Summary of the Invention

[0004] The purpose of this invention is to achieve the rational utilization of high-iron, high-titanium vanadium-titanium magnetite, improve the iron-titanium separation efficiency, and increase the grade and yield of iron concentrate and titanium concentrate.

[0005] This invention provides a method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite, comprising the following steps:

[0006] A. Crush the high-speed rail high-titanium vanadium-titanium magnetite ore to obtain crushed products;

[0007] B. The crushed product obtained in step A is ground to -0.074mm with a proportion of 30% to 40% using a rod mill and hydrocyclone in a closed circuit. The resulting sand is returned to the rod mill, and the resulting overflow is subjected to a first-stage magnetic separation roughing to obtain a first-stage roughing concentrate and a first-stage roughing tailings. The first-stage roughing tailings are subjected to a first-stage magnetic separation scavenging to obtain a first-stage magnetic separation scavenging concentrate and tailings 1. The first-stage roughing concentrate and the first-stage scavenging concentrate are combined into magnetic separation concentrate 1.

[0008] C. The magnetic concentrate 1 obtained in step B is ground to -0.074mm with a content of 60% to 80% using a ball mill, hydrocyclone and high-frequency fine screen in a closed circuit. The resulting sand and oversize are returned to the ball mill. The undersize is subjected to a first-stage fine selection 1 to obtain a first-stage fine selection 1 concentrate and a first-stage fine selection 1 tailings. The first-stage fine selection 1 concentrate is subjected to a first-stage fine selection 2 to obtain an iron concentrate and a first-stage fine selection 2 tailings. The first-stage fine selection 1 tailings and the first-stage fine selection 2 tailings are combined into tailings 2.

[0009] D. Combine tailings 1 obtained in step B and tailings 2 obtained in step C into iron ore beneficiation tailings. After screening and classification, coarse iron ore beneficiation tailings and fine iron ore beneficiation tailings are obtained.

[0010] E. Perform gravity separation on the coarse iron tailings obtained in step D to obtain coarse gravity concentrate and coarse gravity tailings; perform gravity separation on the fine iron tailings obtained in step D to obtain fine gravity concentrate and fine gravity tailings; combine the coarse gravity concentrate and fine gravity concentrate into titanium rough concentrate.

[0011] F. The titanium rough concentrate obtained in step E is subjected to three-stage strong magnetic separation to obtain titanium concentrate.

[0012] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step A, the raw ore of high-iron and high-titanium vanadium-titanium magnetite contains TFe content ≥ 47% and TiO2 content ≥ 18%.

[0013] In the above-mentioned method for separating iron and titanium in high-titanium vanadium-titanium magnetite, step A involves crushing using a first-stage medium crushing and a first-stage closed-circuit fine crushing.

[0014] The iron-titanium separation method for high-speed iron and high-titanium vanadium-titanium magnetite obtained by the above method yields crushed products with a particle size ≤5mm.

[0015] Preferably, the iron-titanium separation method for high-iron, high-titanium vanadium-titanium magnetite obtained by the above method yields a crushed product with a particle size of ≤4mm.

[0016] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, step B involves using a drum magnetic separator for both the roughing and sweeping magnetic separation stages.

[0017] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step B, the magnetic field strength of the first-stage magnetic separation roughing is 2500-3000 Oersted.

[0018] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step B, the magnetic field strength of the first-stage magnetic separation is 2500-3000 Oersted.

[0019] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step C, the first-stage selection 1 and the first-stage selection 2 adopt a drum magnetic separator.

[0020] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step C, the magnetic field strength of the selected section 1 is 2000-2500 Oersted.

[0021] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step C, the magnetic field strength of the selected section 2 is 1500-2000 Oersted.

[0022] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step D, the grading particle size of the screening and classification is 0.038mm, 0.043mm, or 0.074mm (taking a grading particle size of 0.038mm as an example, when iron tailings are screened through a 0.038mm screen, the material on the oversize screen is coarse iron tailings, and the material undersize screen is fine iron tailings).

[0023] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step E, the coarse-grained iron tailings are subjected to gravity separation using a Yunnan Tin fine mud shaking table.

[0024] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step E, the fine-grained iron tailings are subjected to gravity separation using a Yunnan Tin micro-fine mud shaking table.

[0025] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, step E involves a gravity separation process consisting of a roughing stage, a scavenging stage, and a cleaning stage.

[0026] Preferably, in the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, step E, the gravity separation of the coarse iron tailings specifically involves: performing a first-stage roughing process on a Yunnan Tin fine mud shaking table to obtain a first-stage roughing concentrate and a first-stage roughing tailings; performing a first-stage scavenging process on a shaking table to obtain a first-stage scavenging concentrate and a first-stage scavenging tailings; performing a first-stage cleaning process on a shaking table to obtain a coarse gravity concentrate and a first-stage clean tailings; and merging the first-stage scavenging tailings and the first-stage clean tailings into a coarse gravity tailings.

[0027] Preferably, in the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, step E, the gravity separation of the fine-grained iron tailings specifically involves: using a Yunnan Tin fine mud shaking table for a first-stage roughing process to obtain a first-stage roughing concentrate and a first-stage roughing tailings; then using a shaking table for a first-stage scavenging process to obtain a first-stage scavenging concentrate and a first-stage scavenging tailings; finally using a shaking table for a first-stage cleaning process to obtain a fine-grained gravity concentrate and a first-stage clean tailings; and finally merging the first-stage scavenging tailings and the first-stage clean tailings into a fine-grained gravity tailings.

[0028] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, step F involves the use of a SLon-500 high-gradient magnetic separator for the three-stage strong magnetic separation.

[0029] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, in step F, the magnetic field strength of the first stage of strong magnetic separation is 10,000 to 12,000 Oersted, the magnetic field strength of the second stage is 8,000 to 10,000 Oersted, and the magnetic field strength of the third stage is 6,000 to 8,000 Oersted.

[0030] In the above-mentioned method for separating iron and titanium in high-iron and high-titanium vanadium-titanium magnetite, the TFe grade of the obtained iron concentrate in step C is 53.50% to 55.50%.

[0031] In the above-mentioned method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite, in step F, the TiO2 grade of the titanium concentrate is 46% to 48%.

[0032] The beneficial effects of this invention are:

[0033] This invention targets high-iron, high-titanium vanadium-titanium magnetite, employing a two-stage grinding and two-stage magnetic separation process. This improves grinding efficiency while reducing over-grinding, which is beneficial for subsequent titanium beneficiation. The tailings are then separated into coarse and fine particle sizes, with different equipment used for each size to enhance gravity separation. This improves the comprehensive utilization of this high-iron, high-titanium vanadium-titanium magnetite, maximizing yield while ensuring the quality of both iron and titanium concentrates. The method of this invention has low energy consumption, a simple process, and mature industrial equipment, making it suitable for widespread application. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0035] Figure 2 This is a schematic diagram of a grinding and magnetic separation process of the present invention.

[0036] Figure 3 This is a schematic diagram of the two-stage grinding and magnetic separation process of the present invention.

[0037] Figure 4 This is a schematic diagram of the iron tailings gravity separation process of the present invention.

[0038] Figure 5 This is a schematic diagram of the high-intensity magnetic separation process for titanium rough concentrate according to the present invention. Detailed Implementation

[0039] The present invention will be further described in detail below through embodiments, but the scope of protection of the present invention is not limited to the embodiments described herein.

[0040] Example 1

[0041] (1) The raw ore with a particle size of 30mm, a weight of 50.12kg, a TFe grade of 47.35%, and a TiO2 grade of 18.54% was crushed to less than 3mm using a first-stage medium crushing and a first-stage closed-circuit fine crushing to obtain the crushed product.

[0042] (2) The crushed product was ground to -0.074mm with a ratio of 33.54% by using a rod mill and a hydrocyclone in a closed circuit to obtain overflow and underflow. The underflow was returned to the rod mill. Under the condition of 3000 Oersted magnetic field strength, the overflow was subjected to a first-stage magnetic roughing and a first-stage magnetic scavenging to obtain magnetic concentrate 1 with a TFe grade of 52.75% and a weight of 39.69kg (the first-stage roughing concentrate and the first-stage scavenging concentrate were combined into magnetic concentrate 1) and a first-stage magnetic tailings (i.e. tailings 1).

[0043] (3) The magnetic concentrate 1 is ground to -0.074mm with a ratio of 65.35% by ball mill, hydrocyclone and high frequency fine screen to obtain oversize and undersize. The sand and oversize are returned to the ball mill. The undersize is subjected to first-stage refining 1 under a magnetic field strength of 2000 Oersted to obtain first-stage refining 1 concentrate and first-stage refining 1 tailings. The first-stage refining 1 concentrate is subjected to refining 2 under a magnetic field strength of 1500 Oersted to obtain iron concentrate with a TFe grade of 53.81% and a weight of 36.82kg and first-stage refining 2 tailings. The first-stage refining 1 tailings and the first-stage refining 2 tailings are combined into tailings 2.

[0044] (4) The tailings 1 from step (2) and the tailings 2 from step (3) are combined into iron ore tailings. The iron ore tailings are screened through a 0.038mm sieve to obtain a coarse product with a TiO2 grade of 37.55% and a weight of 6.73kg and a fine product with a TiO2 grade of 25.34% and a weight of 6.45kg.

[0045] (5) The coarse-grained product is roughed in one stage using a Yunnan Tin fine mud shaking table (the parameters of the first stage roughing shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first stage roughing concentrate and coarse-grained first stage roughing tailings. The coarse-grained first stage roughing tailings are then scavenged in one stage using a shaking table (the parameters of the first stage scavenging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first stage scavenging concentrate and coarse-grained first stage scavenging tailings. The coarse-grained first stage roughing concentrate and coarse-grained first stage scavenging concentrate are then purged in one stage using a shaking table (the parameters of the first stage purging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained gravity concentrate (i.e., coarse-grained titanium crude concentrate) with a TiO2 grade of 40.15% and a weight of 5.48kg. The coarse-grained first stage scavenging tailings and the coarse-grained first stage purging tailings are combined into coarse-grained gravity tailings.

[0046] The fine-grained product undergoes a primary roughing process using a Yunnan Tin Micro-Fine Sludge Shaking Table (the parameters for the primary roughing shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary roughing concentrate and fine-grained primary roughing tailings. The fine-grained primary roughing tailings are then subjected to a primary scavenging process on a shaking table (the parameters for the primary scavenging shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary scavenging concentrate and fine-grained primary scavenging tailings. The fine-grained primary roughing concentrate and fine-grained primary scavenging concentrate are then subjected to a primary cleaning process on a shaking table (the parameters for the primary cleaning shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained gravity concentrate (i.e., fine-grained titanium rough concentrate) with a TiO2 grade of 40.34% and a weight of 2.34 kg. The fine-grained primary scavenging tailings and the fine-grained primary cleaning tailings are combined into a fine-grained gravity tailings.

[0047] (6) The coarse gravity concentrate and fine coarse gravity concentrate from step (5) are combined into titanium rough concentrate. The titanium rough concentrate is subjected to three-stage cleaning using a SLon-500 high gradient magnetic separator. The magnetic field strength of the first stage cleaning 1 is 10000 Oersted, the magnetic field strength of the second stage cleaning 2 is 8000 Oersted, and the magnetic field strength of the third stage cleaning 3 is 6000 Oersted, resulting in titanium concentrate with a TiO2 grade of 46.54% and a weight of 5.34 kg, as well as strong magnetic tailings.

[0048] Example 2

[0049] (1) The raw ore with a particle size of 30mm, a weight of 50.34kg, a TFe grade of 48.44%, and a TiO2 grade of 19.32% was crushed to less than 4mm using a first-stage medium crushing and a first-stage closed-circuit fine crushing to obtain the crushed product;

[0050] (2) The crushed product was ground to -0.074mm with a ratio of 31.35% by using a rod mill and a hydrocyclone in a closed circuit to obtain overflow and underflow. The underflow was returned to the rod mill. Under a magnetic field strength of 3000 Oersted, the overflow was subjected to a first-stage magnetic roughing separation, and under a magnetic field strength of 2800 Oersted, the first-stage roughing tailings were subjected to scavenging separation to obtain magnetic concentrate 1 (first-stage roughing concentrate + first-stage scavenging concentrate combined into magnetic concentrate 1) with a TFe grade of 51.45% and a weight of 40.22kg and a first-stage magnetic tailings (i.e., tailings 1).

[0051] (3) The magnetic concentrate 1 was ground to -0.074mm with a ratio of 68.34% by ball mill, hydrocyclone and high frequency fine screen to obtain oversize and undersize. The sand and oversize were returned to the ball mill. The undersize was subjected to first-stage refining 1 under a magnetic field strength of 2200 Oersted to obtain first-stage refining 1 concentrate and first-stage refining 1 tailings. The first-stage refining 1 concentrate was subjected to first-stage refining 2 under a magnetic field strength of 1800 Oersted to obtain iron concentrate with a TFe grade of 54.32% and a weight of 35.47kg and first-stage refining 2 tailings. The first-stage refining 1 tailings and the first-stage refining 2 tailings were combined into tailings 2.

[0052] (4) The tailings 1 from step (2) and the tailings 2 from step (3) are combined into iron ore tailings. The iron ore tailings are screened through a 0.043mm sieve to obtain a coarse product with a TiO2 grade of 38.44% and a weight of 6.42kg and a fine product with a TiO2 grade of 26.77% and a weight of 8.11kg.

[0053] (5) The coarse-grained product is roughed on a Yunnan Tin Fine Sludge Shaking Table (the parameters of the first-stage roughing shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first-stage roughing concentrate and coarse-grained first-stage roughing tailings. The coarse-grained first-stage roughing tailings are then scavenged on a shaking table (the parameters of the first-stage scavenging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first-stage scavenging concentrate and coarse-grained first-stage scavenging tailings. The coarse-grained first-stage roughing concentrate and coarse-grained first-stage scavenging concentrate are then purged on a shaking table (the parameters of the first-stage purging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained gravity concentrate (i.e., coarse-grained titanium crude concentrate) with a TiO2 grade of 41.34% and a weight of 5.12kg. The coarse-grained first-stage scavenging tailings and the coarse-grained first-stage purging tailings are combined into coarse-grained gravity tailings.

[0054] The fine-grained product undergoes a primary roughing process using a Yunnan Tin Micro-Fine Sludge Shaking Table (the parameters for the primary roughing shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary roughing concentrate and fine-grained primary roughing tailings. The fine-grained primary roughing tailings are then subjected to a primary scavenging process on a shaking table (the parameters for the primary scavenging shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary scavenging concentrate and fine-grained primary scavenging tailings. The fine-grained primary roughing concentrate and fine-grained primary scavenging concentrate are then subjected to a primary cleaning process on a shaking table (the parameters for the primary cleaning shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained gravity concentrate (i.e., fine-grained titanium rough concentrate) with a TiO2 grade of 39.34% and a weight of 3.23 kg. The fine-grained primary scavenging tailings and the fine-grained primary cleaning tailings are combined into a fine-grained gravity tailings.

[0055] (6) The coarse gravity concentrate and fine coarse gravity concentrate from step (5) are combined into titanium rough concentrate. The titanium rough concentrate is subjected to three-stage cleaning using a SLon-500 high gradient magnetic separator. The magnetic field strength of the first cleaning stage 1 is 9000 Oersted, the magnetic field strength of the second cleaning stage 2 is 8000 Oersted, and the magnetic field strength of the third cleaning stage 3 is 7000 Oersted, resulting in titanium concentrate with a TiO2 grade of 47.21% and a weight of 5.15 kg and strong magnetic tailings.

[0056] Example 3

[0057] (1) The raw ore with a particle size of 30mm, a weight of 49.17kg, a TFe grade of 47.88%, and a TiO2 grade of 18.54% was crushed to less than 4mm using a first-stage medium crushing and a first-stage closed-circuit fine crushing to obtain the crushed product;

[0058] (2) The crushed product was ground to -0.074mm with a ratio of 38.55% by using a rod mill and a hydrocyclone in a closed circuit to obtain overflow and underrun. The underrun was returned to the rod mill. Under a magnetic field strength of 3000 Oersted, the overflow was subjected to a first-stage magnetic roughing separation, and under a magnetic field strength of 2800 Oersted, the first-stage roughing tailings were subjected to scavenging separation to obtain magnetic concentrate 1 (first-stage roughing concentrate + first-stage scavenging concentrate combined into magnetic concentrate 1) with a TFe grade of 51.65% and a weight of 39.12kg and a first-stage magnetic tailings (i.e. tailings 1).

[0059] (3) The magnetic concentrate 1 is ground to -0.074mm with a ratio of 75.34% by ball mill, hydrocyclone and high frequency fine screen to obtain oversize and undersize. The sand and oversize are returned to the ball mill. The undersize is subjected to first-stage refining 1 under a magnetic field strength of 2000 Oersted to obtain first-stage refining 1 concentrate and first-stage refining 1 tailings. The first-stage refining 1 concentrate is subjected to first-stage refining 2 under a magnetic field strength of 1500 Oersted to obtain iron concentrate with a TFe grade of 55.15% and a weight of 34.15kg and first-stage refining 2 tailings. The first-stage refining 1 tailings and the first-stage refining 2 tailings are combined into tailings 2.

[0060] (4) The tailings 1 from step (2) and the tailings 2 from step (3) are combined into iron ore tailings. The iron ore tailings are screened through a 0.074mm sieve to obtain a coarse product with a TiO2 grade of 39.22% and a weight of 5.55kg and a fine product with a TiO2 grade of 28.35% and a weight of 10.30kg.

[0061] (5) The coarse-grained product is roughed on a Yunnan Tin Fine Sludge Shaking Table (the parameters of the first-stage roughing shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first-stage roughing concentrate and coarse-grained first-stage roughing tailings. The coarse-grained first-stage roughing tailings are then scavenged on a shaking table (the parameters of the first-stage scavenging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained first-stage scavenging concentrate and coarse-grained first-stage scavenging tailings. The coarse-grained first-stage roughing concentrate and coarse-grained first-stage scavenging concentrate are then purged on a shaking table (the parameters of the first-stage purging shaking table are 18mm stroke, 260 strokes / minute, and 2 degrees slope) to obtain coarse-grained gravity concentrate (i.e., coarse-grained titanium crude concentrate) with a TiO2 grade of 41.88% and a weight of 4.88 kg. The coarse-grained first-stage scavenging tailings and the coarse-grained first-stage purging tailings are combined into coarse-grained gravity tailings.

[0062] The fine-grained product undergoes a primary roughing process using a Yunnan Tin Micro-Fine Sludge Shaking Table (the parameters for the primary roughing shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary roughing concentrate and fine-grained primary roughing tailings. The fine-grained primary roughing tailings are then subjected to a primary scavenging process on a shaking table (the parameters for the primary scavenging shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained primary scavenging concentrate and fine-grained primary scavenging tailings. The fine-grained primary roughing concentrate and fine-grained primary scavenging concentrate are then subjected to a primary cleaning process on a shaking table (the parameters for the primary cleaning shaking table are: stroke 16mm, stroke rate 280 times / minute, and slope 2 degrees), yielding a fine-grained gravity concentrate (i.e., fine-grained titanium rough concentrate) with a TiO2 grade of 40.12% and a weight of 4.12 kg. The fine-grained primary scavenging tailings and the fine-grained primary cleaning tailings are combined into a fine-grained gravity tailings.

[0063] (6) The coarse gravity concentrate and fine coarse gravity concentrate from step (5) are combined into titanium rough concentrate. The titanium rough concentrate is subjected to three-stage cleaning using a SLon-500 high gradient magnetic separator. The magnetic field strength of the first stage cleaning 1 is 10000 Oersted, the magnetic field strength of the second stage cleaning 2 is 8000 Oersted, and the magnetic field strength of the third stage cleaning 3 is 7000 Oersted, resulting in titanium concentrate with a TiO2 grade of 46.34% and a weight of 5.62 kg and strong magnetic tailings.

Claims

1. A method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite, characterized in that: Includes the following steps: A. Crush the high-speed rail high-titanium vanadium-titanium magnetite ore to obtain crushed products; B. The crushed product obtained in step A is ground to -0.074mm with a proportion of 30%~40% using a rod mill and hydrocyclone in a closed circuit. The resulting sand is returned to the rod mill, and the resulting overflow is subjected to a first-stage magnetic separation roughing to obtain a first-stage roughing concentrate and a first-stage roughing tailings. The first-stage roughing tailings are subjected to a first-stage magnetic separation scavenging to obtain a first-stage magnetic separation scavenging concentrate and tailings 1. The first-stage roughing concentrate and the first-stage scavenging concentrate are combined into magnetic separation concentrate 1. C. The magnetic concentrate 1 obtained in step B is ground to -0.074mm with a content of 60%~80% using a ball mill, hydrocyclone and high frequency fine screen in a closed circuit. The resulting sand and oversize are returned to the ball mill. The undersize is subjected to a first-stage fine selection 1 to obtain a first-stage fine selection 1 concentrate and a first-stage fine selection 1 tailings. The first-stage fine selection 1 concentrate is subjected to a first-stage fine selection 2 to obtain an iron concentrate and a first-stage fine selection 2 tailings. The first-stage fine selection 1 tailings and the first-stage fine selection 2 tailings are combined into tailings 2. D. Combine tailings 1 obtained in step B and tailings 2 obtained in step C into iron ore beneficiation tailings. After screening and classification, coarse iron ore beneficiation tailings and fine iron ore beneficiation tailings are obtained. E. Perform gravity separation on the coarse iron tailings obtained in step D to obtain coarse gravity concentrate and coarse gravity tailings; perform gravity separation on the fine iron tailings obtained in step D to obtain fine gravity concentrate and fine gravity tailings; combine the coarse gravity concentrate and fine gravity concentrate into titanium rough concentrate. F. The titanium rough concentrate obtained in step E is subjected to three-stage strong magnetic separation to obtain titanium concentrate; In step A, the high-iron, high-titanium vanadium-titanium magnetite ore contains ≥47% TFe and ≥18% TiO2. In step D, the grading particle size of the sieving and grading is 0.038 mm, 0.043 mm, or 0.074 mm; In step E, the coarse-grained iron tailings are gravity separated using a Yunnan Tin fine mud shaking table; the fine-grained iron tailings are gravity separated using a Yunnan Tin micro-fine mud shaking table; the gravity separation process consists of one stage of roughing, one stage of scavenging, and one stage of cleaning. In step E, the coarse iron ore tailings undergo gravity separation specifically as follows: the coarse iron ore tailings are subjected to a first-stage roughing process using a Yunnan Tin fine mud shaking table to obtain a first-stage coarse roughing concentrate and a first-stage coarse roughing tailings. The first-stage coarse roughing tailings are then subjected to a first-stage scavenging process on a shaking table to obtain a first-stage coarse scavenging concentrate and a first-stage coarse scavenging tailings. The first-stage coarse roughing concentrate and the first-stage scavenging concentrate are then subjected to a first-stage cleaning process on a shaking table to obtain a coarse gravity concentrate and a first-stage clean tailings. The first-stage scavenging tailings and the first-stage clean tailings are then combined into a coarse gravity tailings. In step E, the fine-grained iron tailings undergo gravity separation specifically as follows: the fine-grained iron tailings are subjected to a first-stage roughing process using a Yunnan Tin fine mud shaking table to obtain a first-stage fine-grained roughing concentrate and a first-stage fine-grained roughing tailings. The first-stage fine-grained roughing tailings are then subjected to a first-stage scavenging process on the shaking table to obtain a first-stage fine-grained scavenging concentrate and a first-stage fine-grained scavenging tailings. The first-stage fine-grained roughing concentrate and the first-stage fine-grained scavenging concentrate are then subjected to a first-stage cleaning process on the shaking table to obtain a fine-grained gravity separation concentrate and a first-stage fine-grained clean tailings. The first-stage fine-grained scavenging tailings and the first-stage fine-grained clean tailings are then combined into a fine-grained gravity separation tailings. In step F, the magnetic field strength of the first strong magnetic separation is 10,000 to 12,000 Oersted, the magnetic field strength of the second strong magnetic separation is 8,000 to 10,000 Oersted, and the magnetic field strength of the third strong magnetic separation is 6,000 to 8,000 Oersted.

2. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step A, the crushing process involves a medium crushing stage and a closed-circuit fine crushing stage; the resulting crushed product has a particle size ≤ 5 mm.

3. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to claim 2, characterized in that: In step A, the particle size of the resulting crushed product is ≤4mm.

4. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step B, at least one of the following must be satisfied: The first-stage magnetic roughing and the first-stage magnetic sweeping adopt a drum magnetic separator; The magnetic field strength of the coarse magnetic separation section is 2500~3000 Oersted; The magnetic field strength of the first-stage magnetic separation is 2500~3000 Oersted.

5. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step C, at least one of the following must be satisfied: The first and second selective sections are made using a drum magnetic separator. The magnetic field strength of the selected section 1 is 2000~2500 Oersted; The magnetic field strength of the selected section 2 is 1500~2000 Oersted.

6. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step F, the three-stage strong magnetic separation is carried out using a SLon-500 high gradient strong magnetic separator.

7. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to any one of claims 1 to 6, characterized in that: In step C, the TFe grade of the obtained iron concentrate is 53.50%~55.50%.

8. The method for separating iron and titanium in high-iron, high-titanium vanadium-titanium magnetite according to any one of claims 1 to 6, characterized in that: In step F, the TiO2 grade of the titanium concentrate is 46%~48%.

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