A tailings disposal device and method for low-grade vanadium-titanium magnetite.

Abstract

This invention relates to the field of comprehensive utilization of vanadium-titanium magnetite, and particularly to a tailings disposal device and method for low-grade vanadium-titanium magnetite. A tailings disposal method for low-grade vanadium-titanium magnetite includes: crushing the low-grade vanadium-titanium magnetite ore to -20 to -50 mm and mixing it; performing dry magnetic separation roughing on the mixed ore to separate it into a first concentrate and a first tailings; performing dry magnetic scavenging on the first tailings to separate it into a second concentrate and a second tailings; mixing the first and second concentrates to obtain the final concentrate, and using the second tailings as the disposal tailings. This tailings disposal process, employing crushing-dry magnetic roughing-dry magnetic scavenging-combining the roughing concentrate and scavenging concentrate into the final concentrate and the scavenging tailings as the final tailings, achieves significant enrichment of TFe and TiO2 in low-grade vanadium-titanium magnetite, enabling efficient tailings disposal of low-grade vanadium-titanium magnetite.

Description

Technical Field

[0001] This invention relates to the field of comprehensive utilization of vanadium-titanium magnetite, and in particular to a tailings disposal device and method for low-grade vanadium-titanium magnetite. Background Technology

[0002] Vanadium-titanium magnetite is an iron ore rich in vanadium and titanium. Its main metallic minerals are magnetite, titanomagnetite, and ilmenite. It develops in basic to ultrabasic rock bodies formed by the cooling of magma. Gangue minerals are mostly plagioclase, pyroxene, olivine, amphibole, and alteration products of these minerals.

[0003] The remaining vanadium-titanium magnetite deposits in my country are primarily low-grade ore (10% ≤ TFe < 20%). Therefore, the low-cost and efficient development of low-grade (10% ≤ TFe < 20%) vanadium-titanium magnetite is of particular importance to my country. Currently, the low-grade vanadium-titanium magnetite deposits developed and utilized in my country are mainly 15% ≤ TFe ≤ 20%. After extraction, dry magnetic separation is widely used for tailings disposal. The magnetic separation equipment consists of a drum magnetic separator + belt (magnetic pulley), with a magnetic field strength of 0.3T–0.45T. The processes include coarse crushing (150–350mm) – dry magnetic separation, coarse crushing – medium crushing (70–80mm) – dry magnetic separation, and three-stage crushing (30–50mm) – dry magnetic separation. The specifications for the aforementioned process equipment are as follows: the TFe grade in the tailings concentrate is 1-2 percentage points higher than that in the feed, the tailings removal rate is 10%-30%, and the TFe grade in the tailings is 11%-15%, while the TiO2 grade is 3%-6%. Currently used tailings removal equipment and processes mainly suffer from low magnetic field strength, resulting in the loss of a large amount of ilmenite in the tailings and thus low titanium resource utilization. Therefore, existing technologies still need improvement. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a tailings disposal device and method for low-grade vanadium-titanium magnetite, in order to solve the problem of low titanium resource utilization in existing tailings disposal equipment and processes.

[0005] A method for discarding tailings from low-grade vanadium-titanium magnetite includes the following steps:

[0006] S1, crush the low-grade vanadium-titanium magnetite ore to -20 to -50 mm and mix it evenly;

[0007] S2, dry magnetic separation roughing is performed on the mixed ore to separate the ore into the first concentrate and the first tailings;

[0008] S3, dry magnetic separation is performed on the first tailings to separate the first tailings into the second concentrate and the second tailings;

[0009] S4, the first concentrate and the second concentrate are mixed to form the final concentrate, and the second tailings are disposed of as tailings.

[0010] Furthermore, the steps after step S1 and before step S2, and after step S2 and before step S3, also include:

[0011] S5 vibrates the ore to adjust the ore feed rate and ore distribution.

[0012] A low-grade vanadium-titanium magnetite tailings disposal device includes a feed hopper, a dry magnetic roughing module, and a dry magnetic scavenging module; the feed hopper is configured to feed ore into the dry magnetic roughing module; the dry magnetic roughing module is configured to divide the ore into a first concentrate and a first tailings; the dry magnetic scavenging module is configured to further divide the first tailings into a second concentrate and a second tailings.

[0013] Furthermore, the dry magnetic separation roughing module includes a first electromagnetic vibrating feeder, a first transmission mechanism, a first concentrate hopper, and a first tailings hopper; the first electromagnetic vibrating feeder is located below the feeder, the first transmission mechanism is located below the first electromagnetic vibrating feeder, and the first concentrate hopper and the first tailings hopper are located below the first transmission mechanism.

[0014] Furthermore, the dry magnetic separation module includes a second electromagnetic vibrating feeder, a second transmission mechanism, a second concentrate hopper, and a second tailings hopper; the second electromagnetic vibrating feeder is located below the first tailings hopper, the second transmission mechanism is located below the second electromagnetic vibrating feeder, and the second concentrate hopper and the second tailings hopper are located below the second transmission mechanism.

[0015] Furthermore, the first transmission mechanism includes a first magnetic pulley, a first rotary bearing, and a first conveyor belt; both the first magnetic pulley and the first rotary bearing are rotatably arranged, and the first conveyor belt is sleeved on the first magnetic pulley and the first rotary bearing.

[0016] Furthermore, the second transmission mechanism includes a second magnetic pulley, a second rotary bearing, and a second conveyor belt; both the second magnetic pulley and the second rotary bearing are rotatably mounted, and the second conveyor belt is sleeved on the second magnetic pulley and the second rotary bearing.

[0017] Furthermore, a first separating plate is provided between the first concentrate hopper and the first tailings hopper, and the first separating plate and the first magnetic pulley are configured to separate the ore into the first concentrate and the first tailings;

[0018] A second separating plate is provided between the second concentrate hopper and the second tailings hopper. The second separating plate and the second magnetic pulley are configured to separate the first tailings into the second concentrate and the second tailings.

[0019] Furthermore, the vibration frequency of the first electromagnetic vibrating feeder during operation is 700 to 3000 times / min; the distance between the unloading end of the first electromagnetic vibrating feeder and the vertical center line of the first magnetic pulley is 50cm to 100cm; the magnetic field strength of the first magnetic pulley is 0.3T to 0.4T; and the speed of the first conveyor belt is 2.0 to 2.5m / s.

[0020] Furthermore, the vibration frequency of the second electromagnetic vibrating feeder during operation is 700 to 3000 times / min; the distance between the unloading end of the second electromagnetic vibrating feeder and the vertical center line of the second magnetic pulley is 50cm to 100cm; the magnetic field strength of the second magnetic pulley is 0.7T to 0.9T; and the speed of the second conveyor belt is 1.5 to 2.0m / s.

[0021] The beneficial effects of this invention are as follows: The process of crushing-dry magnetic separation roughing-dry magnetic separation scavenging-combining the roughing concentrate and scavenging concentrate into the final concentrate, and the scavenging tailings into the final tailings, achieves significant enrichment of TFe and TiO2 in low-grade vanadium-titanium magnetite. This enables efficient tailings disposal of low-grade vanadium-titanium magnetite, significantly improving the iron, vanadium, and titanium grades in the tailings concentrate and reducing the loss of iron, vanadium, and titanium resources in the tailings. It also significantly reduces the amount of ore entering the grinding and beneficiation process, thereby lowering the production cost of grinding and beneficiation of low-grade vanadium-titanium magnetite. This lays the foundation for the low-cost and efficient utilization of iron, vanadium, and titanium in low-grade vanadium-titanium magnetite. Attached Figure Description

[0022] Figure 1 This invention provides a schematic flowchart of a method for removing tailings from low-grade vanadium-titanium magnetite.

[0023] Figure 2 A schematic diagram of a low-grade vanadium-titanium magnetite tailings disposal device provided by the present invention is shown.

[0024] In the diagram: 10. Feed hopper; 21. First electromagnetic vibrating feeder; 22. First magnetic pulley; 23. First rotary bearing; 24. First transmission system; 25. First conveyor belt; 26. First tailings hopper; 27. First concentrate hopper; 28. First sorting plate; 31. Second electromagnetic vibrating feeder; 32. Second magnetic pulley; 33. Second rotary bearing; 34. Second transmission system; 35. Second conveyor belt; 36. Second tailings hopper; 37. Second concentrate hopper; 38. Second sorting plate. Detailed Implementation

[0025] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0026] like Figure 1 As shown, the present invention provides a method for discarding tailings from low-grade vanadium-titanium magnetite, comprising the following steps:

[0027] S1, crush the low-grade vanadium-titanium magnetite ore to -20 to -50 mm and mix it evenly;

[0028] S2, dry magnetic separation roughing is performed on the mixed ore to separate the ore into the first concentrate and the first tailings;

[0029] S3, dry magnetic separation is performed on the first tailings to separate the first tailings into the second concentrate and the second tailings;

[0030] S4, the first concentrate and the second concentrate are mixed to form the final concentrate, and the second tailings are disposed of as tailings.

[0031] This embodiment employs a tailings disposal process consisting of crushing-dry magnetic separation roughing-dry magnetic separation scavenging-combining the roughing concentrate and scavenging concentrate into the final concentrate and the scavenging tailings into the final tailings. This process achieves significant enrichment of TFe and TiO2 in low-grade vanadium-titanium magnetite, laying the foundation for low-cost and efficient utilization of iron, vanadium, and titanium in low-grade vanadium-titanium magnetite.

[0032] In this embodiment, after step S1 and before step S2, and after step S2 and before step S3, the following steps are also included:

[0033] S5 vibrates the ore to adjust the feed rate and distribution of the ore, preventing ore accumulation during feeding and affecting tailings disposal efficiency.

[0034] like Figure 2 As shown, this invention provides a low-grade vanadium-titanium magnetite tailings disposal device, including a feed hopper 10, a dry magnetic separation roughing module, and a dry magnetic separation scavenging module. The feed hopper 10 is configured to feed ore into the dry magnetic separation roughing module; the dry magnetic separation roughing module is configured to separate the ore into a first concentrate and a first tailings; the dry magnetic separation scavenging module is configured to further separate the first tailings into a second concentrate and a second tailings. Specifically, the feed hopper 10 is a conical hopper with a larger top and a smaller bottom, and its volume is 150L. The feed hopper 10, the dry magnetic separation roughing module, and the dry magnetic separation scavenging module are connected by a steel frame.

[0035] In this embodiment, the dry magnetic separation roughing module includes a first electromagnetic vibrating feeder 21, a first transmission mechanism, a first concentrate hopper 27, and a first tailings hopper 26. The first electromagnetic vibrating feeder 21 is located below the feeder and is used to receive the ore discharged from the lower end of the feed hopper 10, and to vibrate the ore above it, so that the ore is evenly sprinkled from the discharge end of the first electromagnetic vibrating feeder 21. Specifically, the first electromagnetic vibrating feeder 21 is a GZ1 type electromagnetic vibrating feeder. The first transmission mechanism is located below the first electromagnetic vibrating feeder 21 and is used to receive the ore sprinkled from the discharge end of the first electromagnetic vibrating feeder 21, and to perform magnetic roughing separation on the ore, separating the ore into a first concentrate and a first tailings. The first concentrate hopper 27 and the first tailings hopper 26 are located below the first transmission mechanism. The first concentrate hopper 27 is used to hold the first concentrate, and the first tailings hopper 26 is used to hold the first tailings.

[0036] In this embodiment, the dry magnetic separation module includes a second electromagnetic vibrating feeder 31, a second transmission mechanism, a second concentrate hopper 37, and a second tailings hopper 36. The second electromagnetic vibrating feeder 31 is located below the first tailings hopper 26 and is used to receive the first tailings discharged from the first tailings hopper 26, and to vibrate the first tailings above it, causing the ore to fall evenly from the discharge end of the second electromagnetic vibrating feeder 31. Specifically, the second electromagnetic vibrating feeder 31 is a GZ1 type electromagnetic vibrating feeder. The second transmission mechanism is located below the second electromagnetic vibrating feeder 31 and is used to receive the ore falling from the discharge end of the first electromagnetic vibrating feeder 21, and to perform magnetic separation of the ore, dividing the first tailings into a second concentrate and a second tailings. The second concentrate hopper 37 and the second tailings hopper 36 are located below the second transmission mechanism. The second concentrate hopper 37 is used to hold the second concentrate, and the second tailings hopper 36 is used to hold the second tailings.

[0037] In this embodiment, the first transmission mechanism includes a first magnetic pulley 22, a first rotary bearing 23, and a first transport belt 25. Both the first magnetic pulley 22 and the first rotary bearing 23 are rotatably mounted, and the first transport belt 25 is sleeved on the first magnetic pulley 22 and the first rotary bearing 23. Both the first magnetic pulley 22 and the first rotary bearing 23 are horizontally mounted. The first magnetic pulley 22 is the driven pulley, and the first rotary bearing 23 is the driving pulley. The first transmission mechanism also includes a first transmission system 24, which drives the first rotary bearing 23 to rotate.

[0038] In this embodiment, the second transmission mechanism includes a second magnetic pulley 32, a second rotary bearing 33, and a second transport belt 35. Both the second magnetic pulley 32 and the second rotary bearing 33 are rotatably mounted, and the second transport belt 35 is sleeved on the second magnetic pulley 32 and the second rotary bearing 33. Both the second magnetic pulley 32 and the second rotary bearing 33 are horizontally positioned. The second magnetic pulley 32 is the driven pulley, and the second rotary bearing 33 is the driving pulley. The second transmission mechanism also includes a second transmission system 34, which drives the second rotary bearing 33 to rotate.

[0039] In this embodiment, a first separating plate 28 is provided between the first concentrate hopper 27 and the first tailings hopper 26. The first separating plate 28 and the first magnetic pulley 22 are configured to separate the ore into the first concentrate and the first tailings.

[0040] A second separating plate 38 is provided between the second concentrate hopper 37 and the second tailings hopper 36. The second separating plate 38 and the second magnetic pulley 32 are configured to separate the first tailings into the second concentrate and the second tailings. Specifically, as follows... Figure 2 As shown, the first concentrate hopper 27, the first tailings hopper 26, the second concentrate hopper 37, and the second tailings hopper 36 are arranged side by side. The first ore separating plate 28 is vertically arranged below the discharge end of the first electromagnetic vibrating feeder 21, and the second ore separating plate 38 is vertically arranged below the discharge end of the second electromagnetic vibrating feeder 31.

[0041] In this embodiment, the vibration frequency of the first electromagnetic vibrating feeder 21 during operation is 700 to 3000 times / min; the distance between the unloading end of the first electromagnetic vibrating feeder 21 and the vertical center line of the first magnetic pulley 22 is 50cm to 100cm; the magnetic field strength of the first magnetic pulley 22 is 0.3T to 0.4T; and the speed of the first conveyor belt 25 is 2.0 to 2.5m / s.

[0042] In this embodiment, the vibration frequency of the second electromagnetic vibrating feeder 31 during operation is 700 to 3000 times / min; the distance between the unloading end of the second electromagnetic vibrating feeder 31 and the vertical center line of the second magnetic pulley 32 is 50cm to 100cm; the magnetic field strength of the second magnetic pulley 32 is 0.7T to 0.9T; and the speed of the second conveyor belt 35 is 1.5 to 2.0m / s.

[0043] The method for removing tailings of low-grade vanadium-titanium magnetite is further explained below with reference to the low-grade vanadium-titanium magnetite tailings removal device provided in the above embodiments:

[0044] A method for tailings disposal of low-grade vanadium-titanium magnetite includes:

[0045] (1) Crush the low-grade vanadium-titanium magnetite ore to -20 to -50 mm and mix it evenly;

[0046] (2) Place the mixed ore into the feed hopper 10;

[0047] (3) Turn on the first electromagnetic vibrating feeder 21 at the bottom of the feed hopper 10 and adjust the vibration frequency of the first electromagnetic vibrating feeder 21 to 700-3000 times / min.

[0048] (4) The first electromagnetic vibrating feeder 21 feeds the ore on it into the first conveyor belt 25. The first conveyor belt 25 drives the ore to move at a speed of 2.0 to 2.5 m / s. The ore on the first conveyor belt 25 is divided into the first concentrate and the first tailings by the first magnetic pulley 22 and the first ore separating plate 28. The first concentrate enters the first concentrate hopper 27 and the first tailings enter the first tailings hopper 26.

[0049] (5) The first tailings are fed into the second electromagnetic vibrating feeder 31 through the first tailings hopper 26. The second electromagnetic vibrating feeder 31 is turned on and the vibration frequency of the second electromagnetic vibrating feeder 31 is adjusted to 700 to 3000 times / min.

[0050] (6) The second electromagnetic vibrating feeder 31 feeds the ore into the second conveyor belt 35. The second conveyor belt 35 drives the ore to move at a speed of 1.5 to 2.0 m / s. The ore on the second conveyor belt 35 is divided into the second concentrate and the second tailings by the second magnetic pulley 32 and the second ore separating plate 38. The second concentrate enters the second concentrate hopper 37 and the second tailings enter the second tailings hopper 36.

[0051] (7) The second concentrate is mixed with the first concentrate to form the final concentrate, and the second tailings are used as tailings to be disposed of.

[0052] The main physicochemical properties of the mineral described in this example are:

[0053] The iron-bearing olivine gabbro ore sample contains fixed amounts of TFe 15.62%, TiO2 3.67%, V2O5 0.143%, SiO2 40.15%, CaO 8.18%, MgO 7.04%, Al2O3 15.05%, and S 0.29%. The main metallic minerals in the sample are titanomagnetite and ilmenite, with minor amounts of pyrrhotite and pyrite, and occasional chalcopyrite and sphalerite. The main non-metallic minerals are plagioclase, chlorite, pyroxene, olivine, and amphibole. Ilmenite and titanomagnetite are closely associated, often existing in aggregate form, with aggregate particles up to 2.5 mm in size. Plagioclase, pyroxene, chlorite, and olivine particles are relatively coarse, and the majority of gangue particles are larger than 0.5 mm. The Fe element and TiO2 chemical phase analysis results of the ore sample are shown in Tables 1 and 2, respectively.

[0054] Table 1. Chemical phase analysis results of Fe element in the raw ore samples of the examples.

[0055]

[0056] Table 2. Chemical phase analysis results of TiO2 in the raw ore samples of the examples.

[0057]

[0058]

[0059] (1) The iron-bearing olivine gabbro sample in the example is crushed to -30mm and mixed evenly. The mixed ore is added to the feed hopper 10. (2) The first electromagnetic vibrating feeder 21 is turned on and the frequency of the first electromagnetic vibrating feeder 21 is adjusted to 1500 times / min. (3) The magnetic field strength of the first magnetic pulley 22 is selected to be 3500 Oe. The first transmission system 24 of the first conveyor belt 25 is turned on and its speed is adjusted to 2.2m / s. (4) The first ore separating plate 28 is adjusted to the center line position of the separation of the first tailings and the first concentrate of the first magnetic pulley 22. (5) The second electromagnetic vibrating feeder is turned on. (6) Select the magnetic field strength of the second magnetic pulley 32 as 8000 Oe, turn on the second transmission system 34 of the second conveyor belt 35, and adjust the speed of the second conveyor belt 35 to 1.5 m / s; (7) Adjust the ore separating plate 2 to the center line of the separation of the second tailings and the second concentrate of the second magnetic pulley 32; (8) Randomly add crushed and mixed ore samples according to the material storage in the feed hopper 10; (9) Collect the products in the first concentrate hopper 27, the second concentrate hopper 37 and the second tailings hopper 36 respectively.

[0060] The results show that, in the example, the low-grade vanadium-titanium magnetite can be treated using the above-mentioned apparatus and method to obtain a tailings concentrate with a yield of 63.15%, TFe and TiO2 grades of 20.40% and 4.78%, respectively, and TFe and TiO2 recoveries of 82.48% and 82.23%, respectively. The tailings disposal rate reaches 36.85%. The TFe and TiO2 grades in the tailings are low, and the loss of TiO2 in the magnetic Fe and ilmenite is minimal. The experimental results are shown in Table 3, the elemental chemical phase analysis results of Fe in the tailings are shown in Table 4, and the elemental chemical phase analysis results of TiO2 in the tailings are shown in Table 5.

[0061] Table 3 Results of pre-enrichment tests of iron-titanium in ferroalloy gabbro

[0062]

[0063] Table 4. Chemical phase analysis results of Fe element in tailings from the examples / %

[0064]

[0065]

[0066] Table 5. Chemical phase analysis results of TiO2 in tailings from the examples / %

[0067]

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications or equivalent substitutions made to the present invention without departing from the spirit and scope thereof should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for discarding tailings from low-grade vanadium-titanium magnetite, characterized in that, Includes the following steps: S1, crush the low-grade vanadium-titanium magnetite ore to -20~-50mm and mix it evenly; S2, dry magnetic separation roughing is performed on the mixed ore to separate the ore into first concentrate and first tailings; the magnetic field strength of the dry roughing is 0.3~0.4T; S3, dry magnetic separation is performed on the first tailings to separate the first tailings into a second concentrate and a second tailings; the strength of the dry magnetic field is 0.7~0.9T; S4, the first concentrate and the second concentrate are mixed to form the final concentrate, and the second tailings are disposed of as tailings.

2. The method for discarding tailings from low-grade vanadium-titanium magnetite according to claim 1, characterized in that, The steps following step S1 and before step S2, and the steps following step S2 and before step S3, also include: S5 vibrates the ore to adjust the ore feed rate and ore distribution.

3. The method for discarding tailings from low-grade vanadium-titanium magnetite according to claim 2, characterized in that, The frequency of the vibration is 700~3000 times / min.

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