Method for recovering iron and titanium in vanadium titano-magnetite

Abstract

The invention discloses a method for recovering iron and titanium in vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation. Raw ore is crushed, and then is subjected to roller milling and screening to obtain oversize and undersize products; undersize products are subjected to weak magnetic pre-selection, tailings obtained after weak magnetic pre-selection and strong magnetic pre-selection are subjected to strong magnetic pre-selection, concentrate obtained after weak magnetic pre-selection and strong magnetic pre-selection are sequentially subjected to first-stage grinding, first-stage weak magnetic separation, second-stage grinding, second-stage weak magnetic separation and second-stage weak magnetic concentration, final iron ore concentrate is obtained, the obtained tailings are combined into iron separation tailings, then the iron separation tailings are subjected to titanium separation grinding, medium magnetic iron removal and strong magnetic roughing, and iron separation tailings are obtained. And tailings obtained after strong magnetic roughing are subjected to strong magnetic scavenging, concentrates obtained after strong magnetic roughing and strong magnetic scavenging are subjected to gravity roughing and gravity concentration, and final titanium concentrates are obtained. By adopting conventional crushing, high-pressure roller grinding, magnetic separation, pre-selection and tailing discarding, the subsequent ore grinding and selecting cost can be effectively reduced, the iron and titanium grades of the ore entering the grinding process are improved, high efficiency and energy conservation are achieved, and the ore dressing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vanadium-titanium magnetite beneficiation, in particular to a method for recovering iron and titanium from vanadium-titanium magnetite. Background Art

[0002] Vanadium-titanium magnetite is a composite mineral resource containing iron, vanadium and titanium. Iron is an essential raw material for steel smelting, vanadium is called "MSG of modern industry", and titanium is known as "space metal". Vanadium-titanium magnetite resources are widely used in defense, military, metallurgy, aerospace, electronic technology and materials science.

[0003] At present, the treatment of vanadium-titanium magnetite generally requires the combination of pre-discarding technology and mineral processing technology. The pre-discarding technology mainly includes dry magnetic separation and discarding, wet magnetic separation and discarding, dry-wet combined magnetic separation and discarding, photoelectric intelligent separation and discarding, etc. Traditional dry magnetic separation and discarding are generally used for dry separation of large ores and strong magnetic separation of coarse-grained minerals. This process is not suitable for useful minerals with fine embedded particles; wet magnetic separation and discarding are mainly used for the separation of fine-grained magnetic minerals, and require pre-grinding to achieve monomer dissociation. The crushing and grinding consumes a lot of energy, and the processing capacity of the equipment used is also limited; the dry-wet combined magnetic separation and discarding process is mainly aimed at vanadium-titanium magnetite ores with uneven coarse and fine embedded useful minerals. Mineral processing technology mainly includes magnetic separation, gravity separation, electrostatic separation, flotation and combined separation of multiple mineral processing methods. Generally speaking, vanadium-titanium magnetite ore is crushed to a certain fineness, and magnetite or titanium magnetite concentrate is first obtained through weak magnetic separation, and then ilmenite concentrate is obtained from the magnetic tailings by flotation, strong magnetic separation-flotation and other methods. However, the flotation process is complicated, the reagent consumption and environmental pollution are large, the energy consumption is high, and the efficiency is poor. Therefore, the vanadium-titanium magnetite beneficiation technology with simple process, energy saving and environmental protection, and high separation efficiency is an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a method for recovering iron and titanium in vanadium-titanium magnetite, which is used to solve the technical problems of high energy consumption, complex process structure, high flotation processing cost, large pollution and poor efficiency in the existing vanadium-titanium magnetite beneficiation technology in the prior art. The present invention realizes the efficient, energy-saving and environmentally friendly separation of vanadium-titanium magnetite by conventional crushing, high-pressure roller grinding, strong magnetic separation pre-separation, stage grinding weak magnetic iron separation and strong magnetic + gravity separation of titanium, so as to obtain qualified iron concentrate products and titanium concentrate products.

[0005] The present invention solves the above problems through the following technical solutions:

[0006] A method for recovering iron and titanium from vanadium-titanium magnetite, comprising:

[0007] Step (1), the raw ore is fed into a high pressure roller mill after being crushed, and the product after the high pressure roller mill enters a screening device for screening to obtain an oversize product and an undersize product, and the oversize product is returned to the high pressure roller mill;

[0008] Step (2), feeding the underscreen product into a weak magnetic pre-selection operation, and then feeding the tailings obtained from the weak magnetic pre-selection operation into a strong magnetic pre-selection operation, and using the tailings obtained from the strong magnetic pre-selection operation as part of the final tailings;

[0009] Step (3), combining the concentrates obtained from the weak magnetic pre-selection operation and the strong magnetic pre-selection operation into a pre-selected concentrate and feeding it into a first-stage grinding operation, then feeding the product after the first-stage grinding operation into a first-stage weak magnetic separation operation, feeding the concentrate obtained from the first-stage weak magnetic separation operation into a second-stage grinding operation, feeding the product after the second-stage grinding operation into a second-stage weak magnetic operation, feeding the roughing concentrate obtained from the second-stage weak magnetic roughing operation into a second-stage weak magnetic concentrating operation, the concentrating concentrate obtained from the second-stage weak magnetic concentrating operation is the final iron concentrate, and combining the tailings obtained from the first-stage weak magnetic separation operation, the second-stage weak magnetic roughing operation and the second-stage weak magnetic concentrating operation into an iron-selecting tailing;

[0010] Step (4), feeding the iron-selected tailings into a titanium-selected grinding operation, feeding the grinding products after the titanium-selected grinding operation into a medium magnetic iron removal operation, feeding the products obtained from the medium magnetic iron removal operation into a strong magnetic roughing operation, feeding the tailings obtained from the strong magnetic roughing operation into a strong magnetic sweeping operation, and the iron-containing impurities obtained from the medium magnetic iron removal operation and the tailings obtained from the strong magnetic sweeping operation are part of the final tailings; combining the concentrates obtained from the strong magnetic roughing operation and the strong magnetic sweeping operation into a strong magnetic concentrate;

[0011] Step (5), feeding the strong magnetic concentrate into the gravity roughing operation, feeding the concentrate obtained from the gravity roughing operation into the gravity concentration operation, the concentrate obtained from the gravity concentration operation is the final titanium concentrate, and the gravity roughing tailings and the tailings obtained from the gravity concentration are both part of the final tailings.

[0012] Preferably, the screening device is a vibrating screen with a mesh size of 3 to 5 mm.

[0013] Preferably, the strong magnetic pre-selection operation uses a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800 to 1400 mT.

[0014] Further preferably, the grinding fineness of -0.074mm in the first-stage grinding operation accounts for 40% to 60%, the grinding fineness of -0.074mm in the second-stage grinding operation accounts for 85% to 95%, the feed concentration of the second-stage weak magnetic concentration operation is 30% to 50%, and the magnetic field strength of the second-stage weak magnetic concentration operation is 96kA / m to 200kA / m.

[0015] Further preferably, the grinding fineness of the titanium ore dressing operation is -0.074mm, accounting for 55% to 75%, the feed concentration of the medium magnetic iron removal operation is 30% to 50%, and the magnetic field strength of the medium magnetic iron removal operation is 240kA / m to 320kA / m; the strong magnetic roughing operation and strong magnetic scanning operation adopt a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800 to 1200mT.

[0016] Further preferably, the feed concentration of the gravity roughing operation is 30% to 50%, and the feed concentration of the gravity cleaning operation is 20% to 40%.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The process of the present invention is simple, easy to operate, low in cost, energy-saving and environmentally friendly, has a large processing capacity, high sorting accuracy, and a high enrichment ratio, and can effectively improve the grade of iron ore and titanium ore concentrates

[0019] (2) The present invention adopts conventional crushing, high-pressure roller grinding, and magnetic separation to pre-select tailings, which can effectively reduce the subsequent ore grinding and selection costs and improve the iron and titanium grades of the ore entering the mill. It is not only highly efficient and energy-saving, but also conducive to improving the ore dressing efficiency.

[0020] (3) The present invention utilizes weak magnetic separation to select iron and strong magnetic separation + gravity separation to select titanium. No chemical mineral processing agent is added during the separation process, which has little or no environmental pollution.

[0021] (4) The present invention realizes the recovery of iron and titanium in vanadium-titanium magnetite by precisely controlling the parameters such as the magnetic field strength of weak magnetic separation, the magnetic induction intensity of strong magnetic separation, and the concentration of gravity separation feed, with high separation accuracy, and can obtain qualified iron concentrate and titanium concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0024] Embodiment 1:

[0025] Combined with Figure 1 As shown, a method for recovering iron and titanium from vanadium-titanium magnetite comprises:

[0026] A vanadium-titanium magnetite ore sample was selected. The Fe grade in the original ore was 27.99% and the TiO2 grade was 13.32%. It is a vanadium-titanium magnetite with a high degree of weathering.

[0027] Step (1): The vanadium-titanium magnetite ore is crushed to -25 mm and fed into a high-pressure roller mill. The high-pressure roller mill product enters a vibrating screen with a mesh size of 3 mm for screening. The -3 mm product under the screen enters the next operation, and the +3 mm product on the screen returns to the high-pressure roller mill.

[0028] Step (2): The -3 mm undersize product obtained in step (1) is fed into a wet coarse-grained permanent magnetic drum separator with a magnetic field strength of 240 kA / m for weak magnetic pre-selection. The weak magnetic pre-selection tailings are fed into a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800 mT. The obtained strong magnetic pre-selection concentrate and weak magnetic pre-selection concentrate are combined into a pre-selection concentrate and fed to the next operation. The strong magnetic pre-selection tailings are discarded as final tailings.

[0029] Step (3): the preselected concentrate obtained in step (2) is fed into a first-stage grinding, and the first-stage grinding product -0.074mm accounts for 45%, the first-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a first-stage weak magnetic separation, the first-stage weak magnetic separation concentrate is fed into a second-stage grinding, and the second-stage grinding product -0.074mm accounts for 85%, the second-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a second-stage weak magnetic roughing separation, the second-stage weak magnetic roughing concentrate is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 128kA / m for a second-stage weak magnetic concentration, the second-stage weak magnetic concentration feed concentration is 35%, the obtained concentrated concentrate is the final iron concentrate, the first-stage weak magnetic tailings, the second-stage weak magnetic roughing tailings, and the second-stage weak magnetic concentration tailings are combined into iron selection tailings and fed to the next step.

[0030] Step (4): the iron-selected tailings obtained in step (3) are fed to titanium-selected grinding, and the obtained titanium-selected grinding product -0.074mm accounts for 62%. The titanium-selected grinding product is fed to a wet permanent magnetic drum magnetic separator with a magnetic field strength of 280kA / m for medium magnetic iron removal operation, and the feed concentration is 45%. The medium magnetic iron removal product is fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1200mT for strong magnetic roughing. The strong magnetic roughing tailings are fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1200mT for strong magnetic scavenging. The strong magnetic roughing concentrate and the strong magnetic scavenging concentrate are combined into a strong magnetic concentrate and fed to the next operation. The iron-containing impurities obtained from the medium magnetic iron removal and the strong magnetic scavenging tailings are discarded as final tailings.

[0031] Step (5): The strong magnetic concentrate obtained in step (4) is fed into a spiral chute gravity separation device for gravity roughing, with a feed concentration of 40%. The obtained gravity roughing concentrate is fed into a spiral chute gravity separation device for gravity concentrating, with a feed concentration of 30%. The obtained gravity concentrating concentrate is the final titanium concentrate, and the gravity roughing tailings and gravity concentrating tailings are both discarded as final tailings.

[0032] Through the above process, iron concentrate with an Fe grade of 62.53% and an Fe recovery rate of 31.25% and titanium concentrate with a TiO2 grade of 46.28% and a TiO2 recovery rate of 35.84% can be finally obtained.

[0033] Embodiment 2:

[0034] Combined with Figure 1 As shown, a method for recovering iron and titanium from vanadium-titanium magnetite comprises:

[0035] The selected vanadium-titanium magnetite ore sample has an Fe grade of 12.78% and a TiO2 grade of 3.56% in the original ore. It is a low-grade vanadium-titanium magnetite.

[0036] Step (1): The vanadium-titanium magnetite ore is crushed to -25 mm and fed into a high-pressure roller mill. The high-pressure roller mill product enters a vibrating screen with a mesh size of 3 mm for screening. The -3 mm product under the screen enters the next operation, and the +3 mm product on the screen returns to the high-pressure roller mill.

[0037] Step (2): The -3 mm undersize product obtained in step (1) is fed into a wet coarse-grained permanent magnetic drum separator with a magnetic field strength of 240 kA / m for weak magnetic pre-selection. The weak magnetic pre-selection tailings are fed into a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1000 mT. The obtained strong magnetic pre-selection concentrate and weak magnetic pre-selection concentrate are combined into a pre-selection concentrate and fed to the next operation. The strong magnetic pre-selection tailings are discarded as final tailings.

[0038] Step (3): the pre-selected concentrate obtained in step (2) is fed into a first-stage grinding, and the first-stage grinding product -0.074mm accounts for 50%, the first-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 160kA / m for a first-stage weak magnetic separation, the first-stage weak magnetic separation concentrate is fed into a second-stage grinding, and the second-stage grinding product -0.074mm accounts for 95%, the second-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 160kA / m for a second-stage weak magnetic roughing separation, and the roughing concentrate is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 96kA / m for a second-stage weak magnetic concentration, the second-stage weak magnetic concentration feed concentration is 30%, and the obtained concentrated concentrate is the final iron concentrate, the first-stage weak magnetic tailings, the second-stage weak magnetic roughing tailings, and the second-stage weak magnetic concentration tailings are combined into iron selection tailings and fed to the next step.

[0039] Step (4): the iron-selected tailings obtained in step (3) are fed to titanium-selected grinding, and the obtained titanium-selected grinding product -0.074mm accounts for 65%. The titanium-selected grinding product is fed to a wet permanent magnetic drum magnetic separator with a magnetic field strength of 240kA / m for medium magnetic iron removal operation, and the feed concentration is 50%. The medium magnetic iron removal product is fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1000mT for strong magnetic roughing. The strong magnetic roughing tailings are fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1000mT for strong magnetic scavenging. The strong magnetic roughing concentrate and the strong magnetic scavenging concentrate are combined into a strong magnetic concentrate and fed to the next operation. The iron-containing impurities and strong magnetic scavenging tailings obtained from the medium magnetic iron removal are discarded as final tailings.

[0040] Step (5): The strong magnetic concentrate obtained in step (4) is fed into a shaking table gravity separation device for gravity roughing, with a feed concentration of 45%. The obtained gravity roughing concentrate is fed into a shaking table gravity separation device for gravity concentrating, with a feed concentration of 35%. The obtained gravity concentrating concentrate is the final titanium concentrate, and the gravity roughing tailings and the gravity concentrating tailings are both discarded as final tailings.

[0041] Through the above process, iron concentrate with an Fe grade of 60.38% and an Fe recovery rate of 40.89% and titanium concentrate with a TiO2 grade of 46.59% and a TiO2 recovery rate of 22.49% can be finally obtained.

[0042] Embodiment 3:

[0043] Combined with Figure 1 As shown, a method for recovering iron and titanium from vanadium-titanium magnetite comprises:

[0044] A vanadium-titanium magnetite ore sample was selected. The Fe grade in the original ore was 27.99% and the TiO2 grade was 13.32%. It is a vanadium-titanium magnetite with a high degree of weathering.

[0045] Step (1): The vanadium-titanium magnetite ore is crushed to -25 mm and fed into a high-pressure roller mill. The high-pressure roller mill product enters a vibrating screen with a mesh size of 4 mm for screening. The -4 mm product under the screen enters the next operation, and the +4 mm product on the screen returns to the high-pressure roller mill.

[0046] Step (2): The -4 mm undersize product obtained in step (1) is fed into a wet coarse-grained permanent magnetic drum separator with a magnetic field strength of 240 kA / m for weak magnetic pre-selection. The weak magnetic pre-selection tailings are fed into a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1400 mT. The obtained strong magnetic pre-selection concentrate and weak magnetic pre-selection concentrate are combined into a pre-selection concentrate and fed to the next operation. The strong magnetic pre-selection tailings are discarded as final tailings.

[0047] Step (3): the preselected concentrate obtained in step (2) is fed into a first-stage grinding, and the first-stage grinding product -0.074mm accounts for 60%, the first-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a first-stage weak magnetic separation, the first-stage weak magnetic separation concentrate is fed into a second-stage grinding, and the second-stage grinding product -0.074mm accounts for 92%, the second-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a second-stage weak magnetic roughing separation, the second-stage weak magnetic roughing concentrate is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 200kA / m for a second-stage weak magnetic concentration, the second-stage weak magnetic concentration feed concentration is 50%, the obtained concentrated concentrate is the final iron concentrate, the first-stage weak magnetic tailings, the second-stage weak magnetic roughing tailings, and the second-stage weak magnetic concentration tailings are combined into iron selection tailings and fed to the next step.

[0048] Step (4): the iron-selected tailings obtained in step (3) are fed to titanium-selected grinding, and the obtained titanium-selected grinding product -0.074mm accounts for 55%. The titanium-selected grinding product is fed to a wet permanent magnetic drum magnetic separator with a magnetic field strength of 320kA / m for medium magnetic iron removal operation, and the feed concentration is 30%. The medium magnetic iron removal product is fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800mT for strong magnetic roughing. The strong magnetic roughing tailings are fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800mT for strong magnetic scavenging. The strong magnetic roughing concentrate and the strong magnetic scavenging concentrate are combined into a strong magnetic concentrate and fed to the next step. The iron-containing impurities obtained from the medium magnetic iron removal and the strong magnetic scavenging tailings are discarded as final tailings.

[0049] Step (5): The strong magnetic concentrate obtained in step (4) is fed into a spiral chute gravity separation device for gravity roughing, with a feed concentration of 30%. The obtained gravity roughing concentrate is fed into a spiral chute gravity separation device for gravity concentrating, with a feed concentration of 40%. The obtained gravity concentrating concentrate is the final titanium concentrate, and the gravity roughing tailings and gravity concentrating tailings are both discarded as final tailings.

[0050] Through the above process, iron concentrate with an Fe grade of 61.53% and an Fe recovery rate of 46.25% and titanium concentrate with a TiO2 grade of 47.58% and a TiO2 recovery rate of 35.18% can be finally obtained.

[0051] Embodiment 4:

[0052] Combined with Figure 1 As shown, a method for recovering iron and titanium from vanadium-titanium magnetite comprises:

[0053] The selected vanadium-titanium magnetite ore sample has an Fe grade of 12.78% and a TiO2 grade of 3.56% in the original ore. It is a low-grade vanadium-titanium magnetite.

[0054] Step (1): The vanadium-titanium magnetite ore is crushed to -25 mm and fed into a high-pressure roller mill. The high-pressure roller mill product enters a vibrating screen with a mesh size of 5 mm for screening. The -5 mm product under the screen enters the next operation, and the +5 mm product on the screen returns to the high-pressure roller mill.

[0055] Step (2): The -5 mm undersize product obtained in step (1) is fed into a wet coarse-grained permanent magnetic drum separator with a magnetic field strength of 240 kA / m for weak magnetic pre-selection. The weak magnetic pre-selection tailings are fed into a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1200 mT. The obtained strong magnetic pre-selection concentrate and weak magnetic pre-selection concentrate are combined into a pre-selection concentrate and fed to the next operation. The strong magnetic pre-selection tailings are discarded as final tailings.

[0056] Step (3): the preselected concentrate obtained in step (2) is fed into a first-stage grinding, and the first-stage grinding product -0.074mm accounts for 40%, the first-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a first-stage weak magnetic separation, the first-stage weak magnetic separation concentrate is fed into a second-stage grinding, and the second-stage grinding product -0.074mm accounts for 90%, the second-stage grinding product is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 224kA / m for a second-stage weak magnetic roughing separation, the second-stage weak magnetic roughing concentrate is fed into a wet electromagnetic drum magnetic separator with a magnetic field strength of 128kA / m for a second-stage weak magnetic concentration, the second-stage weak magnetic concentration feed concentration is 45%, the obtained concentrated concentrate is the final iron concentrate, the first-stage weak magnetic tailings, the second-stage weak magnetic roughing tailings, and the second-stage weak magnetic concentration tailings are combined into iron selection tailings and fed to the next step.

[0057] Step (4): the iron-selected tailings obtained in step (3) are fed to titanium-selected grinding, and the obtained titanium-selected grinding product -0.074mm accounts for 75%. The titanium-selected grinding product is fed to a wet permanent magnetic drum magnetic separator with a magnetic field strength of 280kA / m for medium magnetic iron removal operation, and the feed concentration is 45%. The medium magnetic iron removal product is fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1200mT for strong magnetic roughing. The strong magnetic roughing tailings are fed to a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 1200mT for strong magnetic scavenging. The strong magnetic roughing concentrate and the strong magnetic scavenging concentrate are combined into a strong magnetic concentrate and fed to the next operation. The iron-containing impurities obtained from the medium magnetic iron removal and the strong magnetic scavenging tailings are discarded as final tailings.

[0058] Step (5): The strong magnetic concentrate obtained in step (4) is fed into a spiral chute gravity separation device for gravity roughing, with a feed concentration of 50%. The obtained gravity roughing concentrate is fed into a spiral chute gravity separation device for gravity concentrating, with a feed concentration of 20%. The obtained gravity concentrating concentrate is the final titanium concentrate, and the gravity roughing tailings and gravity concentrating tailings are both discarded as final tailings.

[0059] Through the above process, iron concentrate with an Fe grade of 60.97% and an Fe recovery rate of 36.25% and titanium concentrate with a TiO2 grade of 46.38% and a TiO2 recovery rate of 25.56% can be finally obtained.

[0060] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A method for recovering iron and titanium from vanadium-titanium magnetite, characterized in that: include: Step (1), the raw ore is fed into a high pressure roller mill after being crushed, and the product after the high pressure roller mill enters a screening device for screening to obtain an oversize product and an undersize product, and the oversize product is returned to the high pressure roller mill; Step (2), feeding the underscreen product into a weak magnetic pre-selection operation, and then feeding the tailings obtained from the weak magnetic pre-selection operation into a strong magnetic pre-selection operation, and using the tailings obtained from the strong magnetic pre-selection operation as part of the final tailings; Step (3), combining the concentrates obtained from the weak magnetic pre-selection operation and the strong magnetic pre-selection operation into a pre-selected concentrate and feeding it into a first-stage grinding operation, then feeding the product after the first-stage grinding operation into a first-stage weak magnetic separation operation, feeding the concentrate obtained from the first-stage weak magnetic separation operation into a second-stage grinding operation, feeding the product after the second-stage grinding operation into a second-stage weak magnetic operation, feeding the roughing concentrate obtained from the second-stage weak magnetic roughing operation into a second-stage weak magnetic concentrating operation, the concentrating concentrate obtained from the second-stage weak magnetic concentrating operation is the final iron concentrate, and combining the tailings obtained from the first-stage weak magnetic separation operation, the second-stage weak magnetic roughing operation and the second-stage weak magnetic concentrating operation into an iron-selecting tailing; Step (4), feeding the iron-selected tailings into a titanium-selected grinding operation, feeding the grinding products after the titanium-selected grinding operation into a medium magnetic iron removal operation, feeding the products obtained from the medium magnetic iron removal operation into a strong magnetic roughing operation, feeding the tailings obtained from the strong magnetic roughing operation into a strong magnetic sweeping operation, and the iron-containing impurities obtained from the medium magnetic iron removal operation and the tailings obtained from the strong magnetic sweeping operation are part of the final tailings; The concentrates obtained from the strong magnetic roughing operation and the strong magnetic sweeping operation are combined into a strong magnetic concentrate; Step (5), feeding the strong magnetic concentrate into the gravity roughing operation, feeding the concentrate obtained from the gravity roughing operation into the gravity concentration operation, the concentrate obtained from the gravity concentration operation is the final titanium concentrate, and the gravity roughing tailings and the tailings obtained from the gravity concentration are both part of the final tailings.

2. The method for recovering iron and titanium from vanadium-titanium magnetite according to claim 1, characterized in that: The screening equipment is a vibrating screen with a screen hole size of 3 to 5 mm.

3. The method for recovering iron and titanium from vanadium-titanium magnetite according to claim 1, characterized in that: The strong magnetic pre-selection operation adopts a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800 to 1400 mT.

4. The method for recovering iron and titanium from vanadium-titanium magnetite according to claim 1, characterized in that: The grinding fineness of the first-stage grinding operation is -0.074mm, accounting for 40% to 60%, the grinding fineness of the second-stage grinding operation is -0.074mm, accounting for 85% to 95%, the feed concentration of the second-stage weak magnetic concentration operation is 30% to 50%, and the magnetic field strength of the second-stage weak magnetic concentration operation is 96kA / m to 200kA / m.

5. The method for recovering iron and titanium from vanadium-titanium magnetite according to claim 1, characterized in that: The grinding fineness of the titanium ore dressing operation is -0.074mm, accounting for 55% to 75%, the feed concentration of the medium magnetic iron removal operation is 30% to 50%, and the magnetic field strength of the medium magnetic iron removal operation is 240kA / m to 320kA / m; the strong magnetic roughing operation and strong magnetic sweeping operation adopt a vertical ring pulsating high gradient strong magnetic separator with a magnetic induction intensity of 800 to 1200mT.

6. The method for recovering iron and titanium from vanadium-titanium magnetite according to claim 1, characterized in that: The feed concentration of the roughing operation of the gravity separation is 30% to 50%, and the feed concentration of the fine gravity separation operation is 20% to 40%.

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