Beneficiation method for recovering magnetic iron from vanadium titano-magnetite
By employing a multi-stage beneficiation process and multi-pole magnetic separation, the problem of low recovery rate of vanadium-titanium magnetite caused by under-grinding of titanium magnetite was solved, and efficient recovery of magnetic iron from vanadium-titanium magnetite was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SICHUAN VANADIUM & TITANIUM IND INVESTMENT & DEVELOPMENT CO LTD
- Filing Date
- 2026-02-09
- Publication Date
- 2026-04-21
AI Technical Summary
In the grinding and beneficiation process of vanadium-titanium magnetite, the recovery rate of vanadium-titanium magnetite is low due to under-grinding of titanium magnetite.
The process employs a multi-stage beneficiation procedure, including a first-stage beneficiation, ball milling-screening and classification-multi-polar magnetic separation, a second-stage beneficiation, ball milling-cyclone classification-multi-polar magnetic separation, a third-stage beneficiation, tower milling-cyclone classification-multi-polar magnetic separation, and a fourth-stage beneficiation, tower milling-cyclone and screening combination classification-multi-polar magnetic separation. Magnetic iron is gradually separated and recovered through multi-polar magnetic separation and weak magnetic separation of magnetic iron.
The recovery rate of magnetic iron in vanadium-titanium magnetite was improved. By combining multi-stage beneficiation and multi-pole magnetic separation, more magnetic iron was retained, significantly improving the recovery rate of iron concentrate.
Smart Images
Figure CN121892283A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vanadium-titanium magnetite beneficiation technology, and in particular to a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite. Background Technology
[0002] Vanadium-titanium magnetite contains valuable minerals such as titanite and ilmenite. These two minerals exhibit different degrees of liberation under the same grinding operation. In the grinding and beneficiation process, vanadium-titanium magnetite is usually processed first, followed by ilmenite. However, to ensure the recovery of both minerals, under-grinding of titanite often occurs during the vanadium-titanium magnetite recovery process, resulting in a lower vanadium-titanium magnetite recovery rate. Summary of the Invention
[0003] In view of this, the present invention proposes a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, which solves the technical problem of low recovery rate of vanadium-titanium magnetite due to under-grinding of titanium magnetite in traditional grinding and beneficiation processes.
[0004] On one hand, embodiments of the present invention provide a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, comprising: The raw ore is subjected to a first-stage beneficiation process to obtain a first-stage iron concentrate and a first-stage iron tailings. A second-stage beneficiation process is performed on the iron concentrate from the first-stage iron magnetic separation to obtain a second-stage iron magnetic separation concentrate and a second-stage iron magnetic separation tailings. The tailings from the first-stage iron magnetic separation and the tailings from the second-stage iron magnetic separation are subjected to mineral processing to obtain secondary iron concentrate and secondary titanium material. The iron concentrate from the two-stage iron magnetic separation process is subjected to a three-stage beneficiation process to obtain a three-stage iron magnetic separation concentrate and a three-stage iron magnetic separation tailings. The iron concentrate from the three-stage iron magnetic separation process is subjected to four-stage beneficiation to obtain iron concentrate from the four-stage iron magnetic separation process and iron tailings from the four-stage iron magnetic separation process. Tailings from the three-stage iron and magnetic separation tailings and the four-stage iron and magnetic separation tailings are concentrated to obtain the first titanium-selected material. The first titanium-selected material and the second titanium-selected material are further subjected to weak magnetic separation of iron to obtain weak magnetic separation secondary iron concentrate; Further beneficiation of magnetic iron minerals was carried out on all the secondary iron concentrates obtained above to obtain iron concentrates; The iron concentrate and the four-stage magnetic separation iron concentrate are combined into the final iron concentrate.
[0005] In some embodiments, the first-stage beneficiation of the raw ore includes: ball milling, screening and grading, and multi-pole magnetic separation of the raw ore; The two-stage beneficiation of the first-stage magnetic separation iron concentrate includes: ball milling, hydrocyclone classification, and multi-pole magnetic separation. The three-stage beneficiation of the two-stage magnetic separation iron concentrate includes: tower milling, hydrocyclone classification, and multi-pole magnetic separation of the two-stage magnetic separation iron concentrate; The four-stage beneficiation of the three-stage magnetic separation iron concentrate includes: grinding the three-stage magnetic separation iron concentrate in a tower mill, classifying it using a combination of hydrocyclone and screening, and then performing multi-pole magnetic separation.
[0006] In some implementations, the magnetic field strength for multi-pole magnetic separation of raw ore is higher than that for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates.
[0007] In some implementations, the magnetic field strength for multi-pole magnetic separation of the raw ore is (2500-4000)×10 3 / 4πA / m; the magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates is (600-2400)×10 3 / 4π amperes / meter.
[0008] In some embodiments, ball milling-screening-multi-pole magnetic separation of the raw ore includes: ball milling the raw ore based on a first ball mill; The process of ball milling, hydrocyclone classification, and multi-pole magnetic separation of iron concentrate from primary iron ore beneficiation and magnetic separation includes: ball milling of the iron concentrate from primary iron ore beneficiation and magnetic separation based on a second ball mill; The ratio of the diameter to the length of the first ball mill and the ratio of the diameter to the length of the second ball mill both satisfy a ratio of 1:1.25 to 1:1.85.
[0009] In some embodiments, ball milling-screening-multi-pole magnetic separation of the raw ore includes: screening and classifying the discharged ore from the ball milling process using a linear vibrating screen. The process of grinding, grading with hydrocyclone and screening combination, and multi-pole magnetic separation of three-stage iron magnetic separation concentrate includes: grading the three-stage iron magnetic separation concentrate based on a combination of hydrocyclone and high-frequency vibrating screen.
[0010] In some embodiments, the tailings from the three-stage ferromagnetic separation and the four-stage ferromagnetic separation are concentrated to obtain the first titanium-selected material, which includes: Tailings from three-stage and four-stage ferromagnetic separation are concentrated to obtain concentrated tailings with a solid-liquid ratio of 10% to 15%. The first titanium-selected material is separated from the concentrated tailings.
[0011] In some embodiments, the tailings from the first-stage iron and magnetic separation and the tailings from the second-stage iron and magnetic separation are subjected to beneficiation to obtain secondary iron concentrate and secondary titanium concentrate, comprising: The tailings from the first and second stages of iron magnetic separation are subjected to ball milling, screening and classification, multi-pole magnetic separation and tailings concentration to obtain secondary iron concentrate and secondary titanium material.
[0012] In some embodiments, all the secondary iron concentrates obtained above are further subjected to magnetic iron mineral beneficiation to obtain iron concentrates including: The secondary iron concentrate and the secondary iron concentrate obtained by weak magnetic separation are combined, and the combined secondary iron concentrate is subjected to tower mill grinding, hydrocyclone and screening combination classification, and multi-pole magnetic separation to obtain iron concentrate.
[0013] In some embodiments, the magnetic field strength for multi-pole magnetic separation of the secondary iron concentrate and the secondary iron concentrate obtained by combining the two is (2500-4000)×10. 3 / 4π amperes / meter.
[0014] The present invention has at least the following beneficial effects: This invention provides a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite. The method includes: performing a primary beneficiation on the raw ore to obtain a primary iron concentrate and a primary iron tailings; performing a secondary beneficiation on the primary iron concentrate to obtain a secondary iron concentrate and a secondary iron tailings; beneficiating the primary and secondary iron tailings to obtain a secondary iron concentrate and a second titanium concentrate; and performing a tertiary beneficiation on the secondary iron concentrate to obtain a tertiary iron concentrate and a third titanium concentrate. The tailings from the three-stage iron and magnetic separation process are then subjected to four-stage beneficiation to obtain four-stage iron and magnetic separation concentrate and tailings. The tailings from the three-stage and four-stage iron and magnetic separation processes are then concentrated to obtain a first titanium-selected material. The first and second titanium-selected materials are further subjected to weak magnetic separation of iron to obtain a weakly magnetic secondary iron concentrate. All the secondary iron concentrates obtained above are further subjected to magnetic iron mineral beneficiation to obtain an iron concentrate. The iron concentrate and the iron concentrate from the four-stage iron and magnetic separation processes are then combined to form the final iron concentrate. In the technical solution of this invention, by beneficiating the tailings of the first-stage and second-stage iron magnetic separation, secondary iron concentrate and secondary titanium concentrate can be obtained; by concentrating the tailings of the third-stage and fourth-stage iron magnetic separation, primary titanium concentrate can be obtained; and by further performing magnetic weak magnetic separation on the primary and secondary titanium concentrates, secondary iron concentrate can also be obtained. All the secondary iron concentrates obtained in the above process are then used as raw materials for recovering iron concentrate, effectively improving the recovery rate of iron concentrate. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.
[0016] Figure 1 A flowchart of a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, provided as an embodiment of the present invention; Figure 2 A schematic flowchart of a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, provided in an embodiment of the present invention; Figure 3 A flowchart of another beneficiation method for recovering magnetic iron from vanadium-titanium magnetite provided in an embodiment of the present invention; Figure 4 This is a schematic flowchart of another beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, provided as an embodiment of the present invention. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.
[0019] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.
[0020] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.
[0021] The first aspect of this invention provides a beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, such as... Figure 1As shown, the method specifically includes steps S10 to S80.
[0022] S10. Perform a first-stage beneficiation process on the vanadium-titanium magnetite ore to obtain a first-stage iron concentrate and a first-stage iron tailings.
[0023] Specifically, in this embodiment, the raw ore is vanadium-titanium magnetite. The first stage of beneficiation may include ball milling, screening and classification, and multi-pole magnetic separation. By performing ball milling, screening and classification, and multi-pole magnetic separation on the raw ore, a first-stage iron concentrate and a first-stage iron tailings are obtained.
[0024] S20. Perform a second-stage beneficiation on the iron concentrate from the first-stage iron magnetic separation to obtain a second-stage iron magnetic separation concentrate and a second-stage iron magnetic separation tailings.
[0025] Specifically, the two-stage beneficiation process can include ball milling, hydrocyclone classification, and multi-pole magnetic separation. By performing ball milling, hydrocyclone classification, and multi-pole magnetic separation on the iron concentrate from the first-stage iron magnetic separation, two-stage iron magnetic separation concentrate and two-stage iron magnetic separation tailings can be obtained.
[0026] S30. The tailings from the first-stage iron and magnetic separation and the second-stage iron and magnetic separation are beneficiated to obtain secondary iron concentrate and secondary titanium material.
[0027] In this embodiment of the invention, after obtaining the tailings from the first-stage iron and magnetic separation and the tailings from the second-stage iron and magnetic separation, the tailings from the first-stage iron and magnetic separation and the tailings from the second-stage iron and magnetic separation can be beneficiated to obtain secondary iron concentrate and secondary titanium material.
[0028] The second titanium-selected material consists of coarse and fine tailings. In this embodiment, the tailings from the first-stage iron magnetic separation and the tailings from the second-stage iron magnetic separation can be sequentially subjected to ball milling, screening and classification, multi-pole magnetic separation, and tailings concentration to obtain secondary iron concentrate, coarse tailings, and fine tailings.
[0029] S40. Perform three-stage beneficiation on the two-stage iron magnetic separation concentrate to obtain three-stage iron magnetic separation concentrate and three-stage iron magnetic separation tailings.
[0030] Specifically, the three-stage beneficiation process can include tower milling, hydrocyclone classification, and multi-pole magnetic separation. By performing tower milling, hydrocyclone classification, and multi-pole magnetic separation on the iron concentrate from the two-stage beneficiation process, three-stage beneficiation iron concentrate and three-stage beneficiation tailings can be obtained.
[0031] S50. Perform four-stage beneficiation on the three-stage iron magnetic separation concentrate to obtain four-stage iron magnetic separation concentrate and four-stage iron magnetic separation tailings.
[0032] Specifically, the four-stage beneficiation process can include tower milling, hydrocyclone and screening combination classification, and multi-pole magnetic separation. By performing tower milling, hydrocyclone and screening combination classification, and multi-pole magnetic separation on the iron concentrate from the three-stage iron magnetic separation process, three-stage iron magnetic separation concentrate and three-stage iron magnetic separation tailings can be obtained.
[0033] S60. The tailings from the three-stage ferromagnetic separation and the four-stage ferromagnetic separation are concentrated to obtain the first titanium-selected material.
[0034] In this embodiment of the invention, after obtaining the three-stage iron and magnetic separation tailings and the four-stage iron and magnetic separation tailings, the tailings can be concentrated to obtain the first titanium-selected material.
[0035] The first titanium material is an ultrafine titanium material. Due to the low solid-liquid ratio of the three-stage and four-stage ferromagnetic separation tailings obtained in the previous steps, the ultrafine titanium material cannot be effectively selected. Therefore, in this embodiment, the three-stage and four-stage ferromagnetic separation tailings are concentrated to obtain ultrafine titanium material.
[0036] S70. Further magnetic separation of the first and second titanium-selected materials is carried out to obtain weakly magnetically separated secondary iron concentrate.
[0037] Specifically, ultrafine titanium-selected materials, coarse tailings, and fine tailings can be used as raw materials for weak magnetic separation of magnetic iron. These materials are fed into the weak magnetic separation process, which includes a weak magnetic separation operation to obtain a weakly magnetically separated secondary iron concentrate. The weak magnetic separation process can employ a two-stage strong magnetic separation + flotation process, or other processes; no specific limitations are made here.
[0038] S80. Further beneficiation of magnetic iron minerals is carried out on all the secondary iron concentrates obtained above to obtain iron concentrate.
[0039] Specifically, all the secondary iron concentrates obtained in the previous steps can be combined, and the combined secondary iron concentrates can be beneficiated to obtain iron concentrate. Then, this iron concentrate is combined with the iron concentrate from the four-stage iron separation and magnetic separation to form the final iron concentrate.
[0040] It should be noted that, in the embodiments of the present invention, mineral particles with a particle size of +0.074 mm and a content of greater than 75% are referred to as coarse particles, and mineral particles with a particle size of -0.074 mm and a content of greater than 65% are referred to as fine particles.
[0041] This invention involves a first-stage beneficiation process on the raw ore to obtain a first-stage iron concentrate and a first-stage iron tailings from iron and magnetic separation; a second-stage beneficiation process on the first-stage iron concentrate to obtain a second-stage iron concentrate and a second-stage iron tailings from iron and magnetic separation; further beneficiation of the first-stage and second-stage iron tailings to obtain a secondary iron concentrate and a second titanium concentrate; a third-stage beneficiation process on the second-stage iron concentrate to obtain a third-stage iron concentrate and a third-stage iron tailings from iron and magnetic separation; and a fourth-stage beneficiation process on the third-stage iron concentrate. The technical solution involves obtaining four-stage iron magnetic separation concentrate and four-stage iron magnetic separation tailings; concentrating the tailings from three-stage iron magnetic separation and the four-stage iron magnetic separation tailings to obtain a first titanium-selected material; further performing weak magnetic separation on the first titanium-selected material and the second titanium-selected material to obtain a weakly magnetically separated secondary iron concentrate; further performing magnetic iron mineral beneficiation on all the secondary iron concentrates obtained above to obtain an iron concentrate; and merging this iron concentrate with the four-stage iron magnetic separation iron concentrate to form the final iron concentrate, thereby improving the iron concentrate recovery rate. In the technical solution of this invention, by beneficiating the tailings of the first-stage and second-stage iron magnetic separation, secondary iron concentrate and secondary titanium concentrate can be obtained; by concentrating the tailings of the third-stage and fourth-stage iron magnetic separation, primary titanium concentrate can be obtained; and by further performing magnetic weak magnetic separation on the primary and secondary titanium concentrates, secondary iron concentrate can also be obtained. All the secondary iron concentrates obtained in the above process are then used as raw materials for recovering iron concentrate, effectively improving the recovery rate of iron concentrate.
[0042] In some embodiments of the present invention, the specific process of concentrating the tailings of the three-stage ferromagnetic separation and the four-stage ferromagnetic separation to obtain the first titanium-selected material includes: concentrating the tailings of the three-stage ferromagnetic separation and the four-stage ferromagnetic separation to obtain concentrated tailings, wherein the solid-liquid ratio of the concentrated tailings is 10%~15%; and separating the first titanium-selected material from the concentrated tailings.
[0043] In some embodiments of the present invention, the specific process of beneficiating the tailings of the first-stage iron magnetic separation and the second-stage iron magnetic separation to obtain secondary iron concentrate and secondary titanium material includes: ball milling, screening and classification, multi-pole magnetic separation and tailings concentration of the tailings of the first-stage iron magnetic separation and the second-stage iron magnetic separation to obtain secondary iron concentrate and secondary titanium material.
[0044] In some embodiments of the present invention, the specific process of further beneficiating magnetic iron minerals from all the secondary iron concentrates obtained above to obtain iron concentrate includes: combining the secondary iron concentrate and the weakly magnetically separated secondary iron concentrate, and performing tower milling, hydrocyclone and screening combination classification, and multi-pole magnetic separation on the combined secondary iron concentrate to obtain iron concentrate.
[0045] The following describes the concept of the present invention in conjunction with a specific magnetic iron recovery process. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0046] like Figure 2 As shown, the beneficiation method for recovering magnetic iron from vanadium-titanium magnetite provided by the present invention includes steps S210 to S260.
[0047] S210. The raw ore in the grinding bin is subjected to the first ball milling, screening and classification, and multi-pole magnetic separation to obtain iron concentrate and tailings from the first stage of iron magnetic separation.
[0048] S220. The iron concentrate obtained from the first stage of iron separation by magnetic separation is subjected to a second ball milling, hydrocyclone classification, and multi-pole magnetic separation to obtain the second stage of iron separation by magnetic separation iron concentrate and the second stage of iron separation by magnetic separation tailings.
[0049] S230. The iron concentrate obtained from the two-stage iron magnetic separation in S220 is subjected to a third tower mill grinding-cyclone classification-multi-pole magnetic separation to obtain a three-stage iron magnetic separation iron concentrate and a three-stage iron magnetic separation tailings.
[0050] S240: The three-stage iron magnetic separation concentrate obtained from S230 is subjected to a fourth tower mill-cyclone screening combined classification-multi-stage magnetic separation to obtain four-stage iron magnetic separation concentrate and four-stage iron magnetic separation tailings; the four-stage iron magnetic separation tailings and the three-stage iron magnetic separation tailings obtained from S230 are combined and concentrated to obtain ultrafine titanium material.
[0051] S250, the tailings from the first-stage iron magnetic separation and the second-stage iron magnetic separation obtained from S210 and S220 are subjected to ball milling, screening and classification, multi-pole magnetic separation and tailings concentration to obtain secondary iron concentrate, coarse tailings and fine tailings.
[0052] Subsequently, the coarse and fine tailings obtained from S250, along with the ultrafine titanium-selected material, were subjected to weak magnetic separation of iron to obtain secondary iron concentrate. The coarse tailings were selected as coarse titanium-selected material, and the fine tailings as fine titanium-selected material.
[0053] S260, secondary iron concentrate, and secondary iron concentrate obtained from weak magnetic separation of magnetic iron are combined and subjected to tower mill grinding, hydrocyclone and screening combination classification, and multi-pole magnetic separation to obtain iron concentrate.
[0054] In this embodiment, the coarse and fine tailings obtained by ball milling, screening, multi-polar magnetic separation, and tailings concentration of the tailings from the first and second stages of iron magnetic separation, along with the ultrafine titanium material obtained by combining and concentrating the tailings from the fourth and third stages of iron magnetic separation, are used as titanium-selecting materials for weak magnetic separation of iron. The weakly magnetically separated secondary iron concentrate obtained from the weak magnetic separation of iron and the secondary iron concentrate obtained by ball milling, screening, multi-polar magnetic separation, and tailings concentration of the tailings from the first and second stages of iron magnetic separation are all used as raw materials for recovering iron concentrate, effectively improving the recovery rate of iron concentrate.
[0055] In some embodiments of the present invention, the magnetic field strength for multi-polar magnetic separation of raw ore is higher than that for multi-polar magnetic separation of iron concentrate from primary, secondary, and tertiary iron magnetic separation.
[0056] In some specific embodiments, the magnetic field strength for multi-pole magnetic separation of the raw ore is (2500-4000)×10 3 / 4πA / m; the magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates is (600-2400)×10 3 / 4π amperes / meter.
[0057] In some embodiments of the present invention, the magnetic field strength for multi-polar magnetic separation of raw ore is higher than that for multi-polar magnetic separation of iron concentrate from primary, secondary, and tertiary iron magnetic separation.
[0058] In this embodiment of the invention, by setting the magnetic field strength for multi-polar magnetic separation of raw ore to be higher than that for multi-polar magnetic separation of iron concentrate from first-stage, second-stage, and third-stage iron concentrates, more magnetic iron can be retained, thereby improving the recovery rate of the final iron concentrate.
[0059] In some specific embodiments, the magnetic field strength for multi-pole magnetic separation of the raw ore is (2500-4000)×10 3 / 4πA / m; the magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates is (600-2400)×10 3 / 4π amperes / meter.
[0060] Specifically, the magnetic field strength for multi-pole magnetic separation of raw ore can be (2500, 2800, 3000, 3200, 3500, 3600 or 3800) × 10 3 / 4π A / m. The magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron separation can be (1000, 1200, 1500, 1800, 2000, or 2200) × 10⁻⁴ A / m. 3 / 4π amperes / meter.
[0061] In this embodiment of the invention, the magnetic field strength for multi-polar magnetic separation of the raw ore is set to (2500-4000) × 10. 3 / 4πA / m, and the magnetic field strength for multi-pole magnetic separation of iron concentrate from first-stage, second-stage, and third-stage iron concentrates is set to (600-2400)×10 3 / 4πA / m can retain more magnetic iron, thereby improving the final iron concentrate recovery rate.
[0062] In some embodiments of the present invention, the magnetic field strength of multi-pole magnetic separation of secondary iron concentrate obtained by combining secondary iron concentrate and weakly magnetically separated secondary iron concentrate is higher than the magnetic field strength of multi-pole magnetic separation of primary iron concentrate, secondary iron concentrate, and tertiary iron concentrate.
[0063] In this embodiment of the invention, by setting the magnetic field strength of the secondary iron concentrate obtained by combining secondary iron concentrate and weakly magnetically separated secondary iron concentrate to be higher than the magnetic field strength of the secondary iron concentrate obtained by multi-polar magnetic separation of primary iron concentrate, secondary iron concentrate, and tertiary iron concentrate, more magnetic iron can be retained, thereby improving the recovery rate of the final iron concentrate.
[0064] In some specific embodiments, the magnetic field strength for multi-pole magnetic separation of the secondary iron concentrate obtained by combining secondary iron concentrate and weakly magnetically separated secondary iron concentrate is (2500-4000)×10. 3 / 4πA / m; the magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates is (600-2400)×10 3 / 4π amperes / meter.
[0065] In some specific embodiments, the magnetic separation operation in the mineral processing process can be two or more stages, either parallel or combined vertically.
[0066] In this embodiment of the invention, the magnetic field strength for multi-pole magnetic separation of the secondary iron concentrate obtained by combining secondary iron concentrate and weakly magnetically separated secondary iron concentrate is set to (2500-4000)×10. 3 / 4πA / m, and the magnetic field strength for multi-pole magnetic separation of iron concentrate from first-stage, second-stage, and third-stage iron concentrates is set to (600-2400)×10 3 / 4πA / m can retain more magnetic iron, thereby improving the final iron concentrate recovery rate.
[0067] In some embodiments of the present invention, ball milling-screening-multi-polar magnetic separation of raw ore includes: ball milling the raw ore using a first ball mill. Ball milling-cyclone grading-multi-polar magnetic separation of primary iron concentrate includes: ball milling the primary iron concentrate using a second ball mill.
[0068] The ratio of the diameter to the length of the first ball mill and the ratio of the diameter to the length of the second ball mill both satisfy 1:1.25 to 1:1.85.
[0069] In this embodiment of the invention, both the first and second ball mills can be forced discharge grate-type ball mills or overflow-type ball mills. Preferably, an overflow-type ball mill is used. The ratio of the ball mill diameter Φ to its length L, i.e., Φ:L, is between 1:1.25 and 1:1.85. For example, Φ:L can be 1:1.25, 1:1.3, 1:1.35, 1:1.45, 1:1.55, 1:1.65, or 1:1.8, etc.
[0070] In this embodiment of the invention, a tower mill can be used to grind the two-stage magnetic separation iron concentrate and the three-stage magnetic separation iron concentrate.
[0071] In this embodiment of the invention, by controlling the ratio of the ball mill diameter Φ to the length L between 1:1.25 and 1:1.85, the iron ore can be ground more thoroughly, thereby improving the grade and recovery rate of magnetic iron.
[0072] In some embodiments of the present invention, the process of ball milling-screening-multi-polar magnetic separation of raw ore includes: screening and classifying the discharge from the ball mill using a linear vibrating screen. The process of tower milling-cyclone and screening combination-multi-polar magnetic separation of three-stage iron concentrate includes: classifying the three-stage iron concentrate using a combination of cyclone and high-frequency vibrating screen.
[0073] In this embodiment of the invention, the grading operation can employ screening grading, hydrocyclone grading, or a combination of hydrocyclone and screening. Screening grading can be used in the first-stage beneficiation process and in the beneficiation of secondary iron concentrate and weakly magnetic secondary iron concentrate. Hydrocyclone grading can be used in the second-stage and third-stage beneficiation processes. A combination of hydrocyclone and screening can be used in the fourth-stage beneficiation process and in the beneficiation of tailings from the first-stage and second-stage iron magnetic separation processes.
[0074] In this embodiment of the invention, the screening and grading can be a linear vibrating screen or a high-frequency vibrating screen.
[0075] In some specific embodiments, linear vibrating screens can be used for screening and grading during the first-stage beneficiation process and the beneficiation of secondary iron concentrate and weakly magnetic secondary iron concentrate. In the fourth-stage beneficiation process and the beneficiation of tailings from the first-stage and second-stage magnetic iron separation processes, when using a combination of hydrocyclones and screening for tailings grading, high-frequency vibrating screens are used, thereby ensuring a high recovery rate of magnetic iron.
[0076] In some embodiments, the grading operation in the mineral processing process can be two or more grading stages, either parallel or combined vertically.
[0077] The following describes the concept of the present invention in conjunction with a specific magnetic iron recovery process. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0078] This embodiment is applied to a large vanadium-titanium magnetite beneficiation plant, which processes 24 million tons of vanadium-titanium magnetite with a raw ore grade of 20% annually. Based on the operating rate, its hourly processing capacity is 3030.30 tons.
[0079] like Figure 3 and 4 As shown, the beneficiation method for recovering magnetic iron from vanadium-titanium magnetite provided by the present invention includes steps S310 to S360.
[0080] S310. The raw ore in the grinding bin is subjected to ball milling, screening and classification, and multi-pole magnetic separation to obtain iron concentrate and tailings from iron magnetic separation.
[0081] The specific parameters of the grinding equipment, classifying equipment, and magnetic separation equipment used in this embodiment are as follows: a ball mill with a diameter of 5.5m and a length of 7.0m (diameter to length ratio of 1:1.27) + a single-layer linear screen for classification + an 8-pole magnetic separator with a magnetic field strength of 3000×10⁻⁶. 3 / 4π amperes / meter.
[0082] The specific process of mineral processing in this embodiment is as follows: First, the raw ore in the grinding bin undergoes a pre-screening. The fine particles obtained from the pre-screening undergo a magnetic separation. The coarse particles obtained from the pre-screening undergo a ball milling. The ball mill discharge undergoes a detection screening. The coarse particles obtained from the screening are returned to the ball milling. The fine particles obtained from the detection screening undergo a magnetic separation, resulting in a first-stage iron concentrate and a first-stage iron tailings.
[0083] In this embodiment, when the grinding and classification fineness of less than 74 micrometers accounts for 25% to 28%, the TFe grade is increased from 20% to over 36%, the TFe recovery rate is over 71.60%, and the magnetic iron recovery rate in this operation is greater than 95%.
[0084] S320. The iron concentrate from the first stage of iron magnetic separation is subjected to a second ball milling, hydrocyclone classification, and multi-pole magnetic separation to obtain the iron concentrate from the second stage of iron magnetic separation and the tailings from the second stage of iron magnetic separation.
[0085] The specific parameters of the grinding equipment, classifying equipment, and magnetic separation equipment used in this embodiment are as follows: a ball mill with a diameter of 5.5m and a length of 7.5m (diameter to length ratio of 1:1.36) + hydrocyclone classifier + 8-pole magnetic separator, with a magnetic field strength of 2000×10⁻⁶. 3 / 4π amperes / meter.
[0086] The specific process of mineral processing in this embodiment is as follows: The iron concentrate from the first-stage magnetic separation is fed into a second-stage hydrocyclone. The underflow from the hydrocyclone is then subjected to a second-stage ball milling, and the ball mill discharge is returned to the second-stage hydrocyclone. The overflow from the hydrocyclone is then subjected to a second-stage magnetic separation to obtain the second-stage magnetic separation iron concentrate and the second-stage magnetic separation tailings.
[0087] In this embodiment, with 55% to 65% of the grinding and classification fineness being less than 74 micrometers, the TFe grade increased from 36% to over 48%, the TFe recovery rate was over 71.60%, and the magnetic iron recovery rate in this operation was greater than 95%.
[0088] S330. The iron concentrate from the two-stage iron magnetic separation is subjected to a third tower mill grinding-cyclone classification-multi-pole magnetic separation to obtain the iron concentrate from the three-stage iron magnetic separation and the tailings from the three-stage iron magnetic separation.
[0089] The specific parameters of the grinding equipment, classifying equipment, and magnetic separation equipment used in this embodiment are as follows: The system employs a 1500-type tower mill, a hydrocyclone classifier, and an 8-pole magnetic separator. The magnetic field strength of the magnetic separator is (1500~2000)×10. 3 / 4π amperes / meter.
[0090] The specific beneficiation process in this embodiment is as follows: The iron concentrate from the two-stage magnetic separation is fed into a three-stage hydrocyclone. The underflow from the hydrocyclone is subjected to three-stage ball milling, and the discharge from the ball mill is subjected to three-stage magnetic separation I, yielding three-stage magnetic separation I concentrate and three-stage magnetic separation I tailings. The three-stage magnetic separation I concentrate is returned to the three-stage hydrocyclone. The overflow from the hydrocyclone is subjected to three-stage magnetic separation II, yielding three-stage magnetic separation II concentrate and three-stage magnetic separation II tailings. The three-stage magnetic separation II concentrate is the three-stage iron magnetic separation concentrate, and the three-stage magnetic separation I tailings and three-stage magnetic separation II tailings are the three-stage iron magnetic separation tailings.
[0091] In this embodiment, when the grinding and classification fineness is less than 74 micrometers and accounts for 80% to 85%, the TFe grade is increased from 48% to more than 51%, the TFe recovery rate is more than 59.1%, and the magnetic iron recovery rate in this operation is greater than 98%.
[0092] S340. The three-stage iron magnetic separation concentrate is subjected to a fourth tower mill-cyclone screening combination classification-multi-stage magnetic separation to obtain four-stage iron magnetic separation concentrate and four-stage iron magnetic separation tailings.
[0093] The specific parameters of the grinding equipment, classifying equipment, and magnetic separation equipment used in this embodiment are as follows: The system employs a combination of a 3000-type tower mill, hydrocyclone, and high-frequency fine screen for grading, along with an 8-pole magnetic separator and a 10-pole magnetic separator. The magnetic field strength of the magnetic separator is (1500~2000)×10⁻⁶. 3 / 4π amperes / meter.
[0094] The specific beneficiation process in this embodiment is as follows: The iron concentrate from the three-stage magnetic separation is fed into a four-stage hydrocyclone. The underflow from the hydrocyclone is subjected to a four-stage tower mill, and the mill discharge is subjected to four-stage magnetic separation I, yielding four-stage magnetic separation I concentrate and four-stage magnetic separation I tailings. The four-stage magnetic separation I concentrate is returned to the four-stage hydrocyclone. The hydrocyclone overflow is subjected to four-stage screening. The coarse particles obtained from screening are returned to the four-stage hydrocyclone, and the fine particles obtained from screening are subjected to four-stage magnetic separation II, yielding four-stage magnetic separation II concentrate and four-stage magnetic separation II tailings. The four-stage magnetic separation II concentrate is the four-stage iron magnetic separation concentrate, and the four-stage magnetic separation I tailings and four-stage magnetic separation II tailings are the four-stage iron magnetic separation tailings.
[0095] Subsequently, the tailings from the four-stage ferromagnetic separation and the three-stage ferromagnetic separation were combined and concentrated to obtain ultrafine titanium material.
[0096] In this embodiment, with 85% to 90% of the grinding and classification fineness being less than 35 micrometers, the TFe grade increased from 51% to over 56%, the TFe recovery rate was over 54.69%, and the magnetic iron recovery rate in this operation was greater than 99%.
[0097] To further improve the recovery rate of magnetic iron, the recovery operation of magnetic iron in the first and second stages (i.e., S350) continued. The first stage of this operation increased the magnetic iron yield by 1.5 percentage points and improved the overall magnetic iron recovery rate by about 7%.
[0098] After summing the secondary iron concentrate obtained in step S350 and the secondary iron concentrate obtained in subsequent magnetic iron weak magnetic separation operations, regrinding and re-selection operations were carried out. The main operation adopted was a combination of 1850 tower mill + hydrocyclone and high frequency fine screen classification + 8 pole magnetic separator.
[0099] S350. The tailings from the first-stage iron magnetic separation and the second-stage iron magnetic separation are subjected to ball milling, screening and classification, multi-pole magnetic separation and tailings concentration to obtain secondary iron concentrate, coarse tailings and fine tailings.
[0100] The specific beneficiation process in this embodiment is as follows: The tailings from the first-stage iron magnetic separation are subjected to high-intensity magnetic scavenging to obtain first-stage tailings high-intensity magnetic scavenging concentrate and first-stage tailings high-intensity magnetic scavenging tailings. The first-stage tailings high-intensity magnetic scavenging tailings are then subjected to coarse screening to obtain coarse and fine particles. The coarse particles obtained from the coarse screening are then subjected to first-stage tailings regrinding, and the regrinded coarse particles are returned to the high-intensity magnetic scavenging. The fine particles obtained from the coarse screening are the coarse titanium-selected material, and the first-stage tailings high-intensity magnetic scavenging concentrate is the secondary iron concentrate. The tailings from the second-stage iron magnetic separation are concentrated, and the concentrated second-stage tailings are subjected to high-intensity magnetic scavenging to obtain second-stage tailings high-intensity magnetic scavenging concentrate and second-stage tailings high-intensity magnetic scavenging tailings. The second-stage tailings high-intensity magnetic scavenging tailings are then subjected to coarse screening to obtain coarse and fine particles. The coarse particles obtained from the coarse screening are returned to the first-stage tailings for regrinding. Among them, the fine particles obtained from the coarse screening are the fine titanium-selected materials, and the secondary iron concentrate from the strong magnetic sweeping of the tailings is the secondary iron concentrate.
[0101] The ultrafine titanium material obtained in step S340, as well as the fine and coarse titanium materials obtained in step S350, are subjected to weak magnetic separation of iron to obtain secondary iron concentrate.
[0102] S360. All the secondary iron concentrates obtained above are combined, and the combined secondary iron concentrates are subjected to tower mill grinding, hydrocyclone and screening combination classification, and multi-pole magnetic separation to obtain iron concentrate.
[0103] The specific process of mineral processing in this embodiment is as follows: The secondary iron concentrate obtained in step S350 and the secondary iron concentrate obtained by weak magnetic separation of magnetic iron are combined and concentrated to obtain concentrated secondary iron concentrate. The concentrated secondary iron concentrate is then subjected to strong magnetic separation to obtain secondary iron concentrate strong magnetic separation concentrate and tailings. The secondary iron concentrate strong magnetic separation concentrate is fed into a secondary iron concentrate hydrocyclone. The underflow from the hydrocyclone is subjected to secondary iron concentrate tower milling. The secondary iron concentrate strong magnetic separation concentrate after tower milling is subjected to secondary iron concentrate magnetic separation I to obtain secondary iron concentrate magnetic separation I concentrate and tailings. The secondary iron concentrate magnetic separation I concentrate is returned to the secondary iron concentrate hydrocyclone. The overflow from the hydrocyclone is subjected to secondary iron high-frequency fine screening to obtain coarse and fine particles. The coarse particles are returned to the secondary iron concentrate hydrocyclone, and the fine particles are subjected to secondary iron concentrate magnetic separation II to obtain secondary iron concentrate magnetic separation II concentrate and tailings. The secondary iron concentrate magnetic separation II concentrate is the finely selected iron concentrate. The iron concentrate, together with the four-stage magnetic separation iron concentrate, constitutes the final iron concentrate, which is the magnetic iron to be recovered by the technical solution of this invention.
[0104] In this embodiment, when the grinding and classification fineness of ore less than 35 micrometers accounts for 85% to 90%, the TFe grade is increased to more than 53.5%, the TFe recovery rate is increased by more than 2.32 percentage points, the magnetic iron recovery rate is greater than 98%, which is more than 5 percentage points higher than the original ore magnetic iron recovery rate, and the total magnetic iron recovery rate is 95-97%.
[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A beneficiation method for recovering magnetic iron from vanadium-titanium magnetite, characterized in that, include: The raw ore is subjected to a first-stage beneficiation process to obtain a first-stage iron concentrate and a first-stage iron tailings. A second-stage beneficiation process is performed on the iron concentrate from the first-stage iron magnetic separation to obtain a second-stage iron magnetic separation concentrate and a second-stage iron magnetic separation tailings. The tailings from the first-stage iron magnetic separation and the tailings from the second-stage iron magnetic separation are subjected to mineral processing to obtain secondary iron concentrate and secondary titanium material. The iron concentrate from the two-stage iron magnetic separation process is subjected to a three-stage beneficiation process to obtain a three-stage iron magnetic separation concentrate and a three-stage iron magnetic separation tailings. The iron concentrate from the three-stage iron magnetic separation process is subjected to four-stage beneficiation to obtain iron concentrate from the four-stage iron magnetic separation process and iron tailings from the four-stage iron magnetic separation process. Tailings from the three-stage iron and magnetic separation tailings and the four-stage iron and magnetic separation tailings are concentrated to obtain the first titanium-selected material. The first titanium-selected material and the second titanium-selected material are further subjected to weak magnetic separation of iron to obtain weak magnetic separation secondary iron concentrate; Further beneficiation of magnetic iron minerals was carried out on all the secondary iron concentrates obtained above to obtain iron concentrates; The iron concentrate and the four-stage magnetic separation iron concentrate are combined into the final iron concentrate.
2. The method according to claim 1, characterized in that, The first-stage beneficiation of the raw ore includes: ball milling, screening and classification, and multi-pole magnetic separation of the raw ore; The two-stage beneficiation of the first-stage magnetic separation iron concentrate includes: ball milling, hydrocyclone classification, and multi-pole magnetic separation. The three-stage beneficiation of the two-stage magnetic separation iron concentrate includes: tower milling, hydrocyclone classification, and multi-pole magnetic separation of the two-stage magnetic separation iron concentrate; The four-stage beneficiation of the three-stage magnetic separation iron concentrate includes: grinding the three-stage magnetic separation iron concentrate in a tower mill, classifying it using a combination of hydrocyclone and screening, and then performing multi-pole magnetic separation.
3. The method according to claim 2, characterized in that, The magnetic field strength for multi-pole magnetic separation of raw ore is higher than that for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrate.
4. The method according to claim 3, characterized in that, The magnetic field strength for multi-pole magnetic separation of raw ore is (2500-4000)×10 3 / 4πA / m; the magnetic field strength for multi-pole magnetic separation of iron concentrate from single-stage, double-stage, and triple-stage iron concentrates is (600-2400)×10 3 / 4π amperes / meter.
5. The method according to claim 2, characterized in that, The process of ball milling-screening-multi-polar magnetic separation of the raw ore includes: ball milling the raw ore based on a first ball mill; The process of ball milling, hydrocyclone classification, and multi-pole magnetic separation of iron concentrate from primary iron ore beneficiation and magnetic separation includes: ball milling of the iron concentrate from primary iron ore beneficiation and magnetic separation based on a second ball mill; The ratio of the diameter to the length of the first ball mill and the ratio of the diameter to the length of the second ball mill both satisfy a ratio of 1:1.25 to 1:1.
85.
6. The method according to claim 2, characterized in that, The process of ball milling, screening and classification, and multi-pole magnetic separation of the raw ore includes: screening and classifying the discharged ore from the ball milling process using a linear vibrating screen; The process of grinding, grading with hydrocyclone and screening combination, and multi-pole magnetic separation of three-stage iron magnetic separation concentrate includes: grading the three-stage iron magnetic separation concentrate based on a combination of hydrocyclone and high-frequency vibrating screen.
7. The method according to claim 1, characterized in that, Tailings concentration is performed on the tailings from the three-stage ferromagnetic separation and the four-stage ferromagnetic separation to obtain the first titanium-selected material, which includes: Tailings from three-stage and four-stage ferromagnetic separation are concentrated to obtain concentrated tailings with a solid-liquid ratio of 10% to 15%. The first titanium-selected material is separated from the concentrated tailings.
8. The method according to claim 1, characterized in that, The tailings from the first-stage iron magnetic separation and the tailings from the second-stage iron magnetic separation are subjected to mineral processing to obtain secondary iron concentrate and secondary titanium concentrate, which include: The tailings from the first and second stages of iron magnetic separation are subjected to ball milling, screening and classification, multi-pole magnetic separation and tailings concentration to obtain secondary iron concentrate and secondary titanium material.
9. The method according to claim 1, characterized in that, Further magnetic iron mineral beneficiation was carried out on all the secondary iron concentrates obtained above to obtain iron concentrates including: The secondary iron concentrate and the secondary iron concentrate obtained by weak magnetic separation are combined, and the combined secondary iron concentrate is subjected to tower mill grinding, hydrocyclone and screening combination classification, and multi-pole magnetic separation to obtain iron concentrate.
10. The method according to claim 9, characterized in that, The magnetic field strength for multi-pole magnetic separation of secondary iron concentrate and secondary iron concentrate obtained by merging secondary iron concentrate is (2500-4000)×10 3 / 4π amperes / meter.