Iron-titanium separation method for high-iron and high-titanium type vanadium titano-magnetite

Abstract

The invention discloses an iron and titanium separation method for high-iron and high-titanium type vanadium titano-magnetite, and belongs to the technical field of mineral separation. In order to realize reasonable utilization of the high-iron and high-titanium vanadium titano-magnetite, the invention provides an iron-titanium separation method for the high-iron and high-titanium vanadium titano-magnetite, which comprises the following steps: crushing the high-iron and high-titanium vanadium titano-magnetite to obtain a crushed product; the crushed product is subjected to first-stage ore grinding magnetic separation to obtain magnetic separation concentrate 1 and tailings 1, the magnetic separation concentrate 1 is subjected to second-stage ore grinding magnetic separation to obtain iron ore concentrate and tailings 2, the tailings 1 and the tailings 2 are combined for screening and grading, coarse-grain iron separation tailings and fine-grain iron separation tailings are subjected to reselection to obtain titanium rough concentrate, and finally third-stage high-intensity magnetic separation concentration is conducted. Titanium concentrate is obtained. According to the method, the two-time ore grinding and two-time magnetic separation process is adopted, the ore grinding efficiency is improved, the over-grinding rate is reduced, tailings are divided into the coarse particle size and the fine particle size, the gravity separation effect is improved, and the yield is improved on the premise that the grades of iron ore concentrate and titanium concentrate are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and in particular relates to a method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite. Background Art

[0002] Vanadium-titanium magnetite is an ore resource rich in iron, titanium and vanadium. Its deposits are widely distributed around the world, with a world reserve of 40 billion tons. The characteristics of vanadium-titanium magnetite resources in different countries and regions vary, and the methods of comprehensive utilization are also different. The iron selection process is mostly stage grinding stage iron selection, and the common titanium selection processes are strong magnetic-flotation, spiral chute gravity selection-electrostatic selection and spiral chute gravity selection-strong magnetic-flotation process, strong magnetic-gravity selection, etc. The titanium selection process is generally selected according to the different ore properties and the quality of titanium concentrate produced.

[0003] Compared with ordinary vanadium-titanium magnetite, high-iron and high-titanium vanadium-titanium magnetite may be difficult to grind and separate during the beneficiation process because its iron and titanium content is much higher than that of ordinary vanadium-titanium magnetite, resulting in low iron-titanium separation efficiency, low grade and yield of iron concentrate and titanium concentrate. Therefore, it is necessary to develop a set of beneficiation technology specifically for high-iron and high-titanium vanadium-titanium magnetite. Summary of the invention

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

[0005] The present invention provides a method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite, which comprises the following steps:

[0006] A. Crushing the high-iron and high-titanium vanadium-titanium magnetite ore to obtain a crushed product;

[0007] B. Grind the crushed product obtained in step A to -0.074 mm, accounting for 30% to 40%, by using a rod mill and a cyclone in a closed circuit. Return the sediment to the rod mill. Perform a first-stage magnetic roughing separation on the overflow to obtain a first-stage roughing concentrate and a first-stage roughing tailing. Perform a first-stage magnetic scavenging separation on the first-stage roughing tailing to obtain a first-stage magnetic scavenging concentrate and tailings 1. Combine the first-stage roughing concentrate and the first-stage scavenging concentrate into a magnetic concentrate 1.

[0008] C. Grind the magnetic concentrate 1 obtained in step B to -0.074 mm, accounting for 60% to 80%, by using a ball mill, a cyclone and a high-frequency fine screen in a closed circuit, return the obtained sediment and the screened material to the ball mill, and perform a first-stage concentration 1 on the obtained screened material to obtain a first-stage concentration 1 concentrate and a first-stage concentration 1 tailings. The first-stage concentration 1 concentrate is subjected to a first-stage concentration 2 to obtain an iron concentrate and a first-stage concentration 2 tailings, and the first-stage concentration 1 tailings and the first-stage concentration 2 tailings are combined into tailings 2;

[0009] D. combining the tailings 1 obtained in step B and the tailings 2 obtained in step C into iron-selected tailings, and screening and classifying the iron-selected tailings to obtain coarse-grained iron-selected tailings and fine-grained iron-selected tailings;

[0010] E. Re-select the coarse iron-separation tailings obtained in step D to obtain coarse gravity-separation concentrate and coarse gravity-separation tailings; re-select the fine iron-separation tailings obtained in step D to obtain fine gravity-separation concentrate and fine gravity-separation tailings; combine the coarse gravity-separation concentrate and the fine gravity-separation concentrate into a coarse titanium concentrate;

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

[0012] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step A, the TFe content in the high-iron and high-titanium vanadium-titanium magnetite ore is ≥47%, and the TiO2 content is ≥18%.

[0013] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step A, the crushing adopts a one-stage medium crushing and a one-stage closed-circuit fine crushing.

[0014] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, the particle size of the obtained crushed product is ≤5mm.

[0015] Preferably, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, the particle size of the obtained crushed product is ≤4mm.

[0016] Wherein, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step B, the first stage of magnetic roughing separation and the first stage of magnetic scavenging separation use a drum magnetic separator.

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

[0018] Wherein, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step B, the magnetic field intensity of the first stage magnetic separation is 2500-3000 Oersteds.

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

[0020] Wherein, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step C, the magnetic field strength of the first stage of selection 1 is 2000-2500 Oersteds.

[0021] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step C, the magnetic field strength of the first stage of selection 2 is 1500-2000 Oersteds.

[0022] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step D, the grading particle size of the screening and grading is 0.038mm, 0.043mm or 0.074mm (taking the grading particle size of 0.038mm as an example, the iron-separated tailings are sieved through a 0.038mm sieve, the material on the sieve is the coarse-grained iron-separated tailings, and the material under the sieve is the fine-grained iron-separated tailings).

[0023] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step E, the coarse-grained iron-selected tailings are re-selected using a Yunnan tin fine mud shaking table.

[0024] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step E, the fine-grained iron-selected tailings are re-selected using a Yunnan Tin fine mud shaking table.

[0025] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step E, the gravity separation process is a one-stage roughing separation + a one-stage scavenging separation + a one-stage fine separation.

[0026] Preferably, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step E, the coarse-grained iron-separated tailings are subjected to gravity separation specifically as follows: the coarse-grained iron-separated tailings are subjected to a first-stage roughing separation using a Yunnan tin fine mud shaking table to obtain a coarse first-stage roughing concentration concentrate and a coarse first-stage roughing concentration tailings, the coarse first-stage roughing concentration tailings are subjected to a first-stage scavenging separation on a shaking table to obtain a coarse first-stage scavenging concentration concentrate and a coarse first-stage scavenging concentration tailings, the coarse first-stage roughing concentration concentrate and the coarse first-stage scavenging concentration concentrate are subjected to a first-stage concentrating separation on a shaking table to obtain a coarse gravity separation concentrate and a coarse first-stage concentrating tailings, and the coarse first-stage scavenging concentration tailings and the coarse first-stage concentrating tailings are combined into a coarse gravity separation tailings.

[0027] Preferably, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step E, the fine-grained iron-separated tailings are subjected to gravity separation specifically as follows: the fine-grained iron-separated tailings are subjected to a first-stage roughing separation using a Yunnan tin fine mud shaking table to obtain a fine-grained first-stage roughing separation concentrate and a fine-grained first-stage roughing separation tailings, the fine-grained first-stage roughing separation tailings are subjected to a first-stage scavenging separation on a shaking table to obtain a fine-grained first-stage scavenging separation concentrate and a fine-grained first-stage scavenging separation tailings, the fine-grained first-stage roughing separation concentrate and the fine-grained first-stage scavenging separation concentrate are subjected to a first-stage concentrating separation on a shaking table to obtain a fine-grained gravity separation concentrate and a fine-grained first-stage concentrating tailings, and the fine-grained first-stage scavenging separation tailings and the fine-grained first-stage concentrating tailings are combined into a fine-grained gravity separation tailings.

[0028] Wherein, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step F, the three-stage strong magnetic separation adopts SLon-500 high-gradient strong magnetic separator.

[0029] Among them, in the above-mentioned high-iron and high-titanium vanadium-titanium magnetite iron-titanium separation method, in step F, in the three-stage strong magnetic separation, the magnetic field strength of the first stage strong magnetic separation is 10,000-12,000 oersted, the magnetic field strength of the second stage strong magnetic separation is 8,000-10,000 oersted, and the magnetic field strength of the third stage strong magnetic separation is 6,000-8,000 oersted.

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

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

[0032] Beneficial effects of the present invention:

[0033] The present invention adopts a two-grinding and two-magnetic separation process for high-iron and high-titanium vanadium-titanium magnetite, which improves the grinding efficiency and reduces the over-grinding rate, which is beneficial to the subsequent titanium selection; then the tailings are divided into coarse and fine particle sizes, and different equipment is used for different particle sizes to improve the re-selection effect, thereby improving the comprehensive utilization level of the high-iron and high-titanium vanadium-titanium magnetite, and on the premise of ensuring the grade of iron concentrate and titanium concentrate, the yield is increased as much as possible; the method of the present invention has low energy consumption, simple process, mature equipment industrial application, and can be popularized and applied. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0038] Figure 5 The figure is a schematic diagram of the high intensity magnetic separation process of titanium coarse concentrate according to the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below by way of examples, but the protection scope of the present invention is not limited to the scope of the examples.

[0040] Example 1

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

[0042] (2) The crushed product is ground to -0.074 mm in a closed circuit using a rod mill and a cyclone, accounting for 33.54%, to obtain overflow and sediment, and the sediment is returned to the rod mill; under the condition of a magnetic field strength of 3000 Oersted, the overflow is subjected to a first-stage roughing separation and a first-stage scavenging separation in sequence to obtain a magnetic concentrate 1 with a TFe grade of 52.75% and a weight of 39.69 kg (the first-stage roughing concentrate + the first-stage scavenging concentrate are combined into a magnetic concentrate 1) and a first-stage magnetic tailings (i.e., tailings 1);

[0043] (3) grinding the magnetic concentrate 1 to -0.074 mm, accounting for 65.35%, by using a ball mill, a cyclone and a high-frequency fine screen in a closed circuit to obtain an oversize and an undersize, and returning the sand and the oversize to the ball mill; the undersize is subjected to a first-stage concentration 1 at a magnetic field strength of 2000 Oersteds to obtain a first-stage concentration 1 concentrate and a first-stage concentration 1 tailings; the first-stage concentration 1 concentrate is subjected to a concentration 2 at a magnetic field strength of 1500 Oersteds to obtain an iron concentrate with a TFe grade of 53.81% and a weight of 36.82 kg and a first-stage concentration 2 tailings; the first-stage concentration 1 tailings and the first-stage concentration 2 tailings are combined into tailings 2;

[0044] (4) combining the tailings 1 of step (2) and the tailings 2 of step (3) into iron-selected tailings, and sieving the iron-selected tailings through a 0.038 mm sieve to obtain a coarse-grained product with a TiO2 grade of 37.55% and a weight of 6.73 kg and a fine-grained product with a TiO2 grade of 25.34% and a weight of 6.45 kg;

[0045] (5) The coarse product is subjected to a first-stage roughing on a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage roughing concentrate and a coarse first-stage roughing tailing. The coarse first-stage roughing tailing is subjected to a first-stage scavenging on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage scavenging concentrate and a coarse first-stage scavenging tailing. The coarse first-stage roughing concentrate and the coarse first-stage scavenging concentrate are subjected to a first-stage concentrating on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse gravity concentrate (i.e., a coarse titanium rough concentrate) with a TiO2 grade of 40.15% and a weight of 5.48 kg. The coarse first-stage scavenging tailing and the coarse first-stage concentrating tailing are combined into a coarse gravity tailing;

[0046] The fine-grained product is subjected to a first-stage roughing selection by a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage roughing concentrate and a fine-grained first-stage roughing tailings. The fine-grained first-stage roughing tailings are subjected to a first-stage scavenging selection on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage scavenging concentrate and a fine-grained first-stage scavenging tailings. The fine-grained first-stage roughing concentrate and the fine-grained first-stage scavenging concentrate are subjected to a first-stage concentrating selection on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained gravity-separated concentrate (i.e., a fine-grained titanium rough concentrate) with a TiO2 grade of 40.34% and a weight of 2.34 kg. The fine-grained first-stage scavenging tailings and the fine-grained first-stage concentrating tailings are combined into fine-grained gravity-separated tailings;

[0047] (6) The coarse-grained gravity concentrate and the fine coarse-grained gravity concentrate of step (5) are combined into a titanium coarse concentrate, and the titanium coarse concentrate is subjected to three-stage concentration by a SLon-500 high gradient strong magnetic separator, wherein the magnetic field strength of the first stage concentration 1 is 10,000 oersteds, the magnetic field strength of the second stage concentration 2 is 8,000 oersteds, and the magnetic field strength of the third stage concentration 3 is 6,000 oersteds, thereby obtaining a titanium concentrate with a TiO2 grade of 46.54% and a weight of 5.34 kg and a strong magnetic tailings.

[0048] Example 2

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

[0050] (2) The crushed product is ground to -0.074 mm, accounting for 31.35%, by a rod mill and a cyclone in a closed circuit to obtain overflow and sediment, and the sediment is returned to the rod mill; the overflow is subjected to a first-stage magnetic roughing separation under a magnetic field strength of 3000 Oersteds, and the first-stage roughing tailings are subjected to scavenging under a magnetic field strength of 2800 Oersteds to obtain a magnetic concentrate 1 (the first-stage roughing concentrate + the first-stage scavenging concentrate are combined into a magnetic concentrate 1) with a TFe grade of 51.45% and a weight of 40.22 kg and a first-stage magnetic tailings (i.e., tailings 1);

[0051] (3) grinding the magnetic concentrate 1 to -0.074 mm, accounting for 68.34%, by using a ball mill, a cyclone and a high-frequency fine screen in a closed circuit to obtain an oversize and an undersize, and returning the sand and the oversize to the ball mill; the undersize is subjected to a first-stage concentration 1 at a magnetic field strength of 2200 Oersted to obtain a first-stage concentration 1 concentrate and a first-stage concentration 1 tailings; the first-stage concentration 1 concentrate is subjected to a first-stage concentration 2 at a magnetic field strength of 1800 Oersted to obtain an iron concentrate with a TFe grade of 54.32% and a weight of 35.47 kg and a first-stage concentration 2 tailings; the first-stage concentration 1 tailings and the first-stage concentration 2 tailings are combined into tailings 2;

[0052] (4) combining the tailings 1 of step (2) and the tailings 2 of step (3) into iron-selected tailings, and sieving the iron-selected tailings through a 0.043 mm sieve to obtain a coarse-grained product with a TiO2 grade of 38.44% and a weight of 6.42 kg and a fine-grained product with a TiO2 grade of 26.77% and a weight of 8.11 kg;

[0053] (5) The coarse product is subjected to a first-stage roughing on a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage roughing concentrate and a coarse first-stage roughing tailing. The coarse first-stage roughing tailing is subjected to a first-stage scavenging on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage scavenging concentrate and a coarse first-stage scavenging tailing. The coarse first-stage roughing concentrate and the coarse first-stage scavenging concentrate are subjected to a first-stage concentrating on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse gravity concentrate (i.e., a coarse titanium rough concentrate) with a TiO2 grade of 41.34% and a weight of 5.12 kg. The coarse first-stage scavenging tailing and the coarse first-stage concentrating tailing are combined into a coarse gravity tailing;

[0054] The fine-grained product is subjected to a first-stage roughing selection by a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage roughing concentrate and a fine-grained first-stage roughing tailings. The fine-grained first-stage roughing tailings are subjected to a first-stage scavenging selection on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage scavenging concentrate and a fine-grained first-stage scavenging tailings. The fine-grained first-stage roughing concentrate and the fine-grained first-stage scavenging concentrate are subjected to a first-stage concentrating selection on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained gravity-separated concentrate (i.e., a fine-grained titanium rough concentrate) with a TiO2 grade of 39.34% and a weight of 3.23 kg. The fine-grained first-stage scavenging tailings and the fine-grained first-stage concentrating tailings are combined into fine-grained gravity-separated tailings;

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

[0056] Example 3

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

[0058] (2) The crushed product is ground to -0.074 mm, accounting for 38.55%, by using a rod mill and a cyclone in a closed circuit to obtain overflow and sediment, and the sediment is returned to the rod mill; the overflow is subjected to a first-stage magnetic roughing separation under a magnetic field strength of 3000 Oersteds, and the first-stage roughing tailings are subjected to scavenging under a magnetic field strength of 2800 Oersteds to obtain a magnetic concentrate 1 (the first-stage roughing concentrate + the first-stage scavenging concentrate are combined into a magnetic concentrate 1) with a TFe grade of 51.65% and a weight of 39.12 kg and a first-stage magnetic tailings (i.e., tailings 1);

[0059] (3) grinding the magnetic concentrate 1 to -0.074 mm, accounting for 75.34%, by using a ball mill, a cyclone and a high-frequency fine screen in a closed circuit to obtain an oversize and an undersize, and returning the sand and the oversize to the ball mill; the undersize is subjected to a first-stage concentration 1 at a magnetic field strength of 2000 Oersteds to obtain a first-stage concentration 1 concentrate and a first-stage concentration 1 tailings; the first-stage concentration 1 concentrate is subjected to a first-stage concentration 2 at a magnetic field strength of 1500 Oersteds to obtain an iron concentrate with a TFe grade of 55.15% and a weight of 34.15 kg and a first-stage concentration 2 tailings; the first-stage concentration 1 tailings and the first-stage concentration 2 tailings are combined into tailings 2;

[0060] (4) combining the tailings 1 of step (2) and the tailings 2 of step (3) into iron-selected tailings, and sieving the iron-selected tailings through a 0.074 mm sieve to obtain a coarse-grained product with a TiO2 grade of 39.22% and a weight of 5.55 kg and a fine-grained product with a TiO2 grade of 28.35% and a weight of 10.30 kg;

[0061] (5) The coarse product is subjected to a first-stage roughing on a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage roughing concentrate and a coarse first-stage roughing tailing. The coarse first-stage roughing tailing is subjected to a first-stage scavenging on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse first-stage scavenging concentrate and a coarse first-stage scavenging tailing. The coarse first-stage roughing concentrate and the coarse first-stage scavenging concentrate are subjected to a first-stage concentrating on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 18 mm, a stroke of 260 times / minute, and a slope of 2 degrees) to obtain a coarse gravity concentrate (i.e., a coarse titanium rough concentrate) with a TiO2 grade of 41.88% and a weight of 4.88 kg. The coarse first-stage scavenging tailing and the coarse first-stage concentrating tailing are combined into a coarse gravity tailing;

[0062] The fine-grained product is subjected to a first-stage roughing selection by a Yunnan Tin fine mud shaking table (the parameters of the first-stage roughing shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage roughing concentrate and a fine-grained first-stage roughing tailings. The fine-grained first-stage roughing tailings are subjected to a first-stage scavenging selection on a shaking table (the parameters of the first-stage scavenging shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained first-stage scavenging concentrate and a fine-grained first-stage scavenging tailings. The fine-grained first-stage roughing concentrate and the fine-grained first-stage scavenging concentrate are subjected to a first-stage concentrating selection on a shaking table (the parameters of the first-stage concentrating shaking table are a stroke of 16 mm, a stroke of 280 times / minute, and a slope of 2 degrees) to obtain a fine-grained gravity-separated concentrate (i.e., a fine-grained titanium rough concentrate) with a TiO2 grade of 40.12% and a weight of 4.12 kg. The fine-grained first-stage scavenging tailings and the fine-grained first-stage concentrating tailings are combined into fine-grained gravity-separated tailings;

[0063] (6) The coarse-grained gravity concentrate and the fine coarse-grained gravity concentrate of step (5) are combined into a titanium coarse concentrate, and the titanium coarse concentrate is subjected to three-stage concentration by a SLon-500 high gradient strong magnetic separator, wherein the magnetic field strength of the first stage concentration 1 is 10,000 oersteds, the magnetic field strength of the second stage concentration 2 is 8,000 oersteds, and the magnetic field strength of the third stage concentration 3 is 7,000 oersteds, thereby obtaining a titanium concentrate with a TiO2 grade of 46.34% and a weight of 5.62 kg and a strong magnetic tailings.

Claims

1. A method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite, characterized in that: The following steps are involved: A. Crushing the high-iron and high-titanium vanadium-titanium magnetite ore to obtain a crushed product; B. Grind the crushed product obtained in step A to -0.074 mm, accounting for 30% to 40%, by using a rod mill and a cyclone in a closed circuit. Return the sediment to the rod mill. Perform a first-stage magnetic roughing separation on the overflow to obtain a first-stage roughing concentrate and a first-stage roughing tailing. Perform a first-stage magnetic scavenging separation on the first-stage roughing tailing to obtain a first-stage magnetic scavenging concentrate and tailings 1. Combine the first-stage roughing concentrate and the first-stage scavenging concentrate into a magnetic concentrate 1. C. Grind the magnetic concentrate 1 obtained in step B to -0.074 mm, accounting for 60% to 80%, by using a ball mill, a cyclone and a high-frequency fine screen in a closed circuit, return the obtained sediment and the screened material to the ball mill, and perform a first-stage concentration 1 on the obtained screened material to obtain a first-stage concentration 1 concentrate and a first-stage concentration 1 tailings. The first-stage concentration 1 concentrate is subjected to a first-stage concentration 2 to obtain an iron concentrate and a first-stage concentration 2 tailings, and the first-stage concentration 1 tailings and the first-stage concentration 2 tailings are combined into tailings 2; D. combining the tailings 1 obtained in step B and the tailings 2 obtained in step C into iron-selected tailings, and screening and classifying the iron-selected tailings to obtain coarse-grained iron-selected tailings and fine-grained iron-selected tailings; E. Re-select the coarse iron-separation tailings obtained in step D to obtain coarse gravity-separation concentrate and coarse gravity-separation tailings; re-select the fine iron-separation tailings obtained in step D to obtain fine gravity-separation concentrate and fine gravity-separation tailings; combine the coarse gravity-separation concentrate and the fine gravity-separation concentrate into a coarse titanium concentrate; F. The titanium concentrate obtained in step E is subjected to three-stage high-intensity magnetic separation to obtain titanium concentrate.

2. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step A, the TFe content in the high-iron and high-titanium vanadium-titanium magnetite ore is ≥47%, and the TiO2 content is ≥18%.

3. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step A, the crushing adopts a stage of medium crushing and a stage of closed-circuit fine crushing; the particle size of the obtained crushed product is ≤5mm; preferably ≤4mm.

4. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step B, at least one of the following is met: The first stage of magnetic roughing and the first stage of magnetic scavenging adopt a drum type magnetic separator; The magnetic field strength of the first stage of magnetic separation 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 from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step C, at least one of the following conditions must be met: The first stage cleaning 1 and the first stage cleaning 2 adopt a drum type magnetic separator; The magnetic field strength of the first stage of selection is 2000-2500 Oersted; The magnetic field strength of the first selection stage 2 is 1500-2000 Oersted.

6. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step D, the grading particle size of the screening and grading is 0.038 mm, 0.043 mm or 0.074 mm.

7. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step E, at least one of the following is satisfied: The coarse iron ore tailings are re-selected by using a Yunnan tin fine mud shaking table; The fine iron ore tailings are re-selected by using a Yunnan Tin fine mud shaking table; The process of gravity separation is one stage of rough separation + one stage of scavenging separation + one stage of fine separation; The coarse iron-separated tailings are subjected to gravity separation specifically as follows: the coarse iron-separated tailings are subjected to a first-stage roughing separation on a Yunnan Tin fine mud shaking table to obtain a coarse first-stage roughing concentrate and a coarse first-stage roughing tailings; the coarse first-stage roughing tailings are subjected to a first-stage scavenging separation on a shaking table to obtain a coarse first-stage scavenging concentrate and a coarse first-stage scavenging tailings; the coarse first-stage roughing concentrate and the coarse first-stage scavenging concentrate are subjected to a first-stage concentrating separation on a shaking table to obtain a coarse gravity separation concentrate and a coarse first-stage concentrating tailings; the coarse first-stage scavenging tailings and the coarse first-stage concentrating tailings are combined into a coarse gravity separation tailings; The re-selection of the fine-grained iron-separated tailings is specifically as follows: the fine-grained iron-separated tailings are subjected to a first-stage roughing selection on a Yunnan Tin fine mud shaking table to obtain a fine-grained first-stage roughing selection concentrate and a fine-grained first-stage roughing selection tailings; the fine-grained first-stage roughing selection tailings are subjected to a first-stage scavenging selection on a shaking table to obtain a fine-grained first-stage scavenging selection concentrate and a fine-grained first-stage scavenging selection tailings; the fine-grained first-stage roughing selection concentrate and the fine-grained first-stage scavenging selection concentrate are subjected to a first-stage concentrating selection on a shaking table to obtain a fine-grained re-selection concentrate and a fine-grained first-stage concentrating tailings; the fine-grained first-stage scavenging selection tailings and the fine-grained first-stage concentrating tailings are combined into fine-grained re-selection tailings.

8. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: In step F, at least one of the following is satisfied: The three-stage strong magnetic separation adopts SLon-500 high gradient strong magnetic separator; In the three-stage strong magnetic separation, the magnetic field strength of the first stage is 10000-12000 oersted, the magnetic field strength of the second stage is 8000-10000 oersted, and the magnetic field strength of the third stage is 6000-8000 oersted.

9. The method for separating iron and titanium from high-iron and high-titanium vanadium-titanium magnetite according to any one of claims 1 to 8, characterized in that: In step C, the TFe grade of the obtained iron concentrate is 53.50% to 55.50%.

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

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