Preparation method of vanadium-titanium pellet

Abstract

A preparation method of vanadium-titanium pellet, comprising the following steps: a) after the sieving classification of siderite, the part less than 6mm is finely ground to obtain the finely ground siderite; b) after the finely ground siderite obtained in step a) is mixed with vanadium-titanium concentrate and bentonite, the balling is carried out to obtain green balls with a pellet size of 8-16mm; c) after the green balls with a pellet size of 8-16mm obtained in step b) are laid, the drying, preheating and roasting are sequentially carried out, and the vanadium-titanium pellet is obtained after cooling. Compared with the prior art, the preparation method of vanadium-titanium pellet provided by the application introduces siderite as the raw material for classification preparation, realizes the overall good interaction through specific process steps and conditions, can not only form good pore channels for the pellets produced by the high-titanium vanadium-titanium magnetite of fine particle size during preheating and roasting, ensure uniform oxidation during the preheating and roasting process, and improve the compressive strength of the pellets, but also can effectively utilize the cheap siderite resource and reduce the production cost.

Description

Technical Field

[0001] This invention relates to the field of iron and steel smelting technology, and more specifically, to a method for preparing vanadium-titanium pellets. Background Technology

[0002] Improving the comprehensive utilization efficiency of vanadium-titanium magnetite has long been a technical challenge that needs to be addressed by those skilled in the art. Meanwhile, researchers in the industry have been committed to increasing the TFe grade of iron concentrate to reduce ironmaking costs. For the past decade or so, limited by ore properties and equipment, the TFe grade of Miyun iron concentrate has remained at 53.5%, and the TFe grade of Baima iron concentrate has remained at 55%–56%, far lower than the TFe grade of ordinary iron concentrate (63%–67%). To address this, those skilled in the art have tackled the mineral processing technology challenges, increasing the TFe grade of the Midi vanadium-titanium concentrate to 55.5% and the TFe grade of the Baima vanadium-titanium concentrate to over 57%. However, with the increase in TFe grade, the particle size of the vanadium-titanium concentrate has become significantly finer. When the finer vanadium-titanium concentrate enters the pellets, during the preheating process, the Fe3O4 on the outside of the pellets is rapidly oxidized, forming a relatively dense Fe2O3 oxide shell, which hinders oxygen from entering the interior of the pellets. This results in poor preheating oxidation effect, and the Fe3O4 inside the pellets can only be fully oxidized in the roasting section. This leads to uneven oxidation time and degree, forming a concentric crack structure, which greatly reduces the compressive strength of the vanadium-titanium pellets.

[0003] Iron in siderite mainly exists in the form of FeCO3. Theoretically, siderite begins to decompose at around 400℃ and completes decomposition at 560℃. However, the preheating temperature for typical pellets is around 800℃. Under these high-temperature conditions, FeCO3 completely decomposes to produce FeO and CO2, which tend to form stable Fe3O4 or Fe2O3 under sintering conditions. This characteristic causes siderite to negatively impact the strength of the sintered ore, making it undesirable for many steel companies. However, with continuous steel production, iron ore resources are dwindling, and mining costs are rising, leading to a significant increase in pig iron production costs. Therefore, using inexpensive siderite has become a crucial technical measure for steel companies to reduce production costs. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for preparing vanadium-titanium magnetite pellets, which uses siderite as raw material and is prepared by graded processing. This method not only enables the formation of good pore channels during preheating and roasting of pellets produced from fine-grained high-titanium vanadium-titanium magnetite, ensuring uniform oxidation during preheating and roasting and improving the compressive strength of the pellets, but also effectively utilizes inexpensive siderite resources and reduces production costs.

[0005] This invention provides a method for preparing vanadium-titanium pellets, comprising the following steps:

[0006] a) After screening and classifying the siderite, the portion smaller than 6mm is finely ground to obtain finely ground siderite.

[0007] b) After mixing the finely ground siderite obtained in step a) with vanadium-titanium concentrate and bentonite, pelletizing is carried out to obtain green pellets with a particle size of 8~16mm.

[0008] c) After the green pellets with a particle size of 8-16mm obtained in step b) are distributed, they are dried, preheated and roasted in sequence, and then cooled to obtain vanadium-titanium pellets.

[0009] Preferably, the screening and grading in step a) yields a portion greater than or equal to 6 mm and a portion less than 6 mm; wherein the portion greater than or equal to 6 mm is used in the fabric application process in step c).

[0010] Preferably, the fine grinding process in step a) requires that the proportion of particles smaller than 0.074 mm reaches 70%.

[0011] Preferably, the mass ratio of finely ground siderite to vanadium-titanium concentrate and bentonite in step b) is (4~14):1:(35~45).

[0012] Preferably, the pelletizing process described in step b) is as follows:

[0013] The mixed materials are added to a disc pelletizer for pelletizing, and the moisture content is controlled at 7.5%~8.5% to obtain green pellets with a particle size of 8~16mm.

[0014] Preferably, the disc pelletizer has the following specifications: Φ (6000~8000) mm × (900~1100) mm, a rotation speed of 10 r / min~30 r / min, and an inclination angle of 45°~50°.

[0015] Preferably, the fabric processing in step c) specifically involves:

[0016] The siderite particles with a size greater than or equal to 6mm from the screening and grading process in step a) are evenly distributed on the belt roasting machine trolley to form a base material. The number of material layers is controlled to be 2 to 3. After the base material is laid, green pellets with a particle size of 8 to 16mm obtained in step b) are evenly distributed on the base material layer by layer. At the same time, siderite edge material with a size greater than or equal to 6mm is laid on both sides of the green pellets to complete the material laying process.

[0017] Preferably, the drying temperature in step c) is 280℃~320℃ and the time is 20min~40min.

[0018] Preferably, the preheating temperature in step c) is 750℃~850℃ and the time is 5min~15min.

[0019] Preferably, the roasting temperature in step c) is 1200℃~1300℃ and the time is 10min~20min.

[0020] This invention provides a method for preparing vanadium-titanium magnetite pellets, comprising the following steps: a) after screening and classifying siderite, the portion smaller than 6mm is finely ground to obtain finely ground siderite; b) the finely ground siderite obtained in step a) is mixed with vanadium-titanium concentrate and bentonite, and then pelletized to obtain green pellets with a particle size of 8-16mm; c) the green pellets with a particle size of 8-16mm obtained in step b) are distributed, and then successively dried, preheated, and roasted, and cooled to obtain vanadium-titanium magnetite pellets. Compared with the prior art, the method for preparing vanadium-titanium magnetite pellets provided by this invention introduces siderite as raw material for graded preparation. Through specific process steps and conditions, better overall interaction is achieved. This not only enables the formation of good pore channels in the preheating and roasting of pellets produced from fine-grained high-titanium vanadium-titanium magnetite, ensuring uniform oxidation during preheating and roasting, and improving the compressive strength of the pellets, but also effectively utilizes inexpensive siderite resources and reduces production costs.

[0021] Meanwhile, the vanadium-titanium pellet preparation method provided by this invention is simple in process, requires simple equipment, is easy to operate, and has significant effects, thus having broad application prospects. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides a method for preparing vanadium-titanium pellets, comprising the following steps:

[0024] a) After screening and classifying the siderite, the portion smaller than 6mm is finely ground to obtain finely ground siderite.

[0025] b) After mixing the finely ground siderite obtained in step a) with vanadium-titanium concentrate and bentonite, pelletizing is carried out to obtain green pellets with a particle size of 8~16mm.

[0026] c) After the green pellets with a particle size of 8-16mm obtained in step b) are distributed, they are dried, preheated and roasted in sequence, and then cooled to obtain vanadium-titanium pellets.

[0027] This invention primarily proposes a utilization method for siderite resources in the Panzhihua-Xichang region. It not only effectively promotes the mining of siderite resources in the surrounding area but also improves the quality indicators of ultrafine vanadium-titanium concentrate pellets through novel technical means. Simultaneously, it increases pellet yield, reduces the consumption of bottom and edge materials for pelletizing, and creates economic benefits. The invention first screens and classifies the siderite. Then, large siderite particles (6mm or larger) are used as bottom and edge materials in belt pellet roasting. Smaller siderite particles (smaller than 6mm) are finely ground in a tower mill and used to produce green vanadium-titanium pellets. These green pellets are then evenly distributed onto a belt roaster for pellet roasting, and the decomposed and crushed bottom and edge siderite is recycled. The preparation method provided by this invention can effectively utilize siderite resources, recover a large amount of iron from the ore resources, and its mining cost is relatively low, which can reduce the cost of pig iron production and create economic benefits. At the same time, it can drive the mining of siderite resources in the surrounding areas, provide jobs for the surrounding people, and has significant social benefits.

[0028] This invention first screens and grades the siderite, then finely grinds the portion smaller than 6mm to obtain finely ground siderite. In this invention, the siderite is a resource mined from surrounding mines, and its preferred chemical composition is as follows:

[0029] w (TFe) 30% ~ 35%, w (SiO2) 15% ~ 18%, w (Al2O3) < 2.5%, w (CaO) < 3%, w (burning loss) 22% ~ 25%.

[0030] Currently, siderite resources are under-mined and are considered off-site mining. The weight percentage of coarse and fine particles is not significantly different, so they need to be screened and graded before pellet preparation and feeding. The screening and grading is preferably carried out in two sizes to obtain a portion greater than or equal to 6 mm (set according to the width of the belt roaster grate) and a portion less than 6 mm. The portion less than 6 mm is finely ground, and the portion greater than or equal to 6 mm is used in the feeding process in step c) for bottom and edge laying.

[0031] In this invention, the fine grinding process is preferably performed such that 70% of the particles are less than 0.074 mm in size. The fine grinding process is carried out using a tower mill, which is well known to those skilled in the art, and this invention does not impose any special restrictions on it.

[0032] After obtaining finely ground siderite, this invention mixes the finely ground siderite with vanadium-titanium concentrate and bentonite, and then pelletizes the mixture to obtain green pellets with a particle size of 8-16 mm. In this invention, the vanadium-titanium concentrate is preferably Baima concentrate, which belongs to the ultrafine-grained high-titanium type vanadium-titanium magnetite concentrate; the proportion of vanadium-titanium magnetite concentrate with a particle size of less than 0.074 mm is about 95%, and the pelletizing index is about 0.5.

[0033] In this invention, the bentonite is used as a binder. There are no special restrictions on its source, and commercially available products known to those skilled in the art can be used. The bentonite has a particle size of less than 0.074 mm, accounting for about 99%.

[0034] The pellet material of this invention adopts the structure of "vanadium-titanium concentrate + siderite + bentonite". Through pellet experiments, it was found that the compressive strength of the pellets increased significantly after roasting.

[0035] In this invention, the preferred mass ratio of finely ground siderite to vanadium-titanium concentrate and bentonite is (4~14):1:(35~45).

[0036] The present invention does not impose any special restrictions on the mixing process; a V-type mixer, which is well known to those skilled in the art, can be used to mix the mixture evenly for 5 to 15 minutes.

[0037] In this invention, the pelletizing process is preferably as follows:

[0038] The mixed materials are added to a disc pelletizer for pelletizing, and the moisture content is controlled at 7.5%~8.5% to obtain green pellets with a particle size of 8~16mm.

[0039] In this invention, the mixture added to the disc pelletizer is first prepared into mother balls of about 1 mm by dripping water to form balls. Then, the mixture is replaced with mist water to continue pelletizing. The mixture is evenly coated on the outside of the mother ball by spraying mist water while adding the mixed material. The green ball particle size is ensured to reach 8~16 mm to form vanadium-titanium green balls with a moisture content controlled at 8.0%±0.5%.

[0040] In this invention, the preferred specifications of the disc pelletizing machine are Φ (6000~8000) mm × (900~1100) mm, the preferred rotation speed is 10 r / min~30 r / min, more preferably 20 r / min~25 r / min, and the preferred tilt angle is 45°~50° (adjustable).

[0041] In this invention, the particle size of the green pellets obtained by pelletizing is preferably 8~16mm, and the drop strength of the green pellets is controlled to be greater than 4 times / piece (0.5m), and the compressive strength is controlled to be greater than 10N / piece.

[0042] After obtaining green pellets with a particle size of 8-16mm, the present invention distributes the green pellets with a particle size of 8-16mm into a feedstock, and then sequentially processes them through drying, preheating, and roasting, followed by cooling to obtain vanadium-titanium ore pellets.

[0043] In this invention, the fabric processing is preferably as follows:

[0044] The siderite particles with a size greater than or equal to 6mm from the screening and grading process in step a) are evenly distributed on the belt roasting machine trolley to form a base material. The number of material layers is controlled to be 2 to 3. After the base material is laid, green pellets with a particle size of 8 to 16mm obtained in step b) are evenly distributed on the base material layer by layer. At the same time, siderite edge material with a size greater than or equal to 6mm is laid on both sides of the green pellets to ensure that the bottom and side walls of the belt roasting machine trolley will not be damaged due to excessive roasting temperature. This completes the material laying process.

[0045] In this invention, the drying temperature is preferably 280℃~320℃, and the drying time is preferably 20min~40min.

[0046] In this invention, the preheating temperature is preferably 750℃~850℃, more preferably 800℃~850℃, and the preheating time is preferably 5min~15min, more preferably 10min~12min.

[0047] In this invention, the roasting temperature is preferably 1200℃~1300℃, more preferably 1250℃, and the roasting time is preferably 10min~20min, more preferably 15min.

[0048] In this invention, after the roasting is completed, the pellets are removed and placed in a well-ventilated natural environment for cooling; finally, the compressive strength of the cooled pellets is tested.

[0049] In this invention, the vanadium-titanium pellets obtained by the preparation method have a particle size of 8-16 mm and a compressive strength greater than 2200 N.

[0050] This invention provides a method for preparing vanadium-titanium pellets, which has the following beneficial effects:

[0051] (1) Replacing finished pellets with large-particle siderite as bottom and edge material can reduce the amount of finished pellets to be roasted, greatly saving gas consumption in the pelleting process and reducing production costs; (2) Taking advantage of the characteristic that siderite begins to decompose at 400℃, it forms CO2 pore channels during the preheating process of vanadium-titanium pellets, which improves the formation of dense Fe2O3 oxide layer in ultrafine vanadium-titanium concentrate, promotes the uniformity of oxidation inside and outside the pellets, improves the occurrence of concentric cracks, and increases the compressive strength of vanadium-titanium pellets; (3) The cheap and low-grade siderite resources in the western part of Panzhihua are recycled and utilized, which drives the mining of siderite resources in the surrounding area, provides jobs for the people in the surrounding area, and has obvious social benefits.

[0052] This invention provides a method for preparing vanadium-titanium magnetite pellets, comprising the following steps: a) after screening and classifying siderite, the portion smaller than 6mm is finely ground to obtain finely ground siderite; b) the finely ground siderite obtained in step a) is mixed with vanadium-titanium concentrate and bentonite, and then pelletized to obtain green pellets with a particle size of 8-16mm; c) the green pellets with a particle size of 8-16mm obtained in step b) are distributed, and then successively dried, preheated, and roasted, and cooled to obtain vanadium-titanium magnetite pellets. Compared with the prior art, the method for preparing vanadium-titanium magnetite pellets provided by this invention introduces siderite as raw material for graded preparation. Through specific process steps and conditions, better overall interaction is achieved. This not only enables the formation of good pore channels in the preheating and roasting of pellets produced from fine-grained high-titanium vanadium-titanium magnetite, ensuring uniform oxidation during preheating and roasting, and improving the compressive strength of the pellets, but also effectively utilizes inexpensive siderite resources and reduces production costs.

[0053] Meanwhile, the vanadium-titanium pellet preparation method provided by this invention is simple in process, requires simple equipment, is easy to operate, and has significant effects, thus having broad application prospects.

[0054] To further illustrate the present invention, the following embodiments provide a detailed description. The physicochemical parameters of the ultrafine-grained vanadium-titanium concentrate, bentonite, and finely ground siderite used in the following embodiments are shown in Table 1 below.

[0055] Table 1. Particle size distribution of materials used (particle size composition, unit: wt%)

[0056]

[0057] The chemical composition indicators of the materials used in Table 1 are as follows:

[0058] Vanadium-titanium concentrate: w(TFe) 55.00%~56.50%, w(FeO) >29%, w(SiO2) 3.30%~3.50%, w(TiO2) 11.00%~11.50%, w(V2O5) 0.60%~0.65%;

[0059] Bentonite: w(CaO) 2.00%~5.00%, w(SiO2) 40.00%~60.00%, w(Al2O3) 12.00%~18%, w(MgO) 2.00%~5.00%;

[0060] Siderite: w(TFe) 30%~35%, w(SiO2) 15%~18%, w(Al2O3) <2.5%, w(CaO) <3%, w(loss on ignition) 22%~25%.

[0061] The raw material ratios for vanadium-titanium pellets are shown in Table 2 below.

[0062] Table 2 Raw material ratio (wt%)

[0063]

[0064] The specific preparation process is as follows:

[0065] First, the lumpy siderite concentrate is screened and classified into portions greater than or equal to 6 mm and portions smaller than 6 mm. The portions smaller than 6 mm are then finely ground until the proportion of particles smaller than 0.074 mm reaches about 70%. Then, according to the proportions shown in Table 2, the corresponding weight percentages of vanadium-titanium concentrate, bentonite, and finely ground siderite are weighed and placed in a drying drum for drying, controlling the moisture content after drying to 7.0% ± 0.5%. The dried mixture is then placed in a high-intensity mixer for thorough mixing for 10 minutes. The mixed mixture is then added to a disc pelletizer for pelletizing, controlling the moisture content to 7.5%~8.5%. The disc pelletizer is Φ7000×1000mm, with a rotation speed of 20 r / min and an inclination angle of 48°, producing qualified green pellets with a particle size of 8~16 mm.

[0066] The green pellets were tested for drop strength and compressive strength. The drop strength test method was to raise the green pellets to a height of 0.5 meters and then drop them freely onto an iron plate. The number of drops that caused the green pellets to break was counted as the number of drops. The compressive strength test method was to directly place the green pellets into a compressive strength testing device for testing.

[0067] Finally, the siderite particles larger than or equal to 6mm are evenly distributed on the belt roaster trolley to form a base material. The number of material layers is controlled to be 2-3 layers. After the base material is laid, the prepared qualified green pellets are evenly distributed layer by layer on the base material, and siderite particles larger than or equal to 6mm are laid on both sides of the green pellets to ensure that the bottom and side walls of the belt roaster trolley are not damaged due to excessive roasting temperature. Finally, the qualified green pellets are dried, preheated and roasted. The drying, preheating and roasting regime is as follows: drying temperature 300℃, drying time 30min, preheating temperature 800℃, preheating time 10min, roasting temperature 1250℃, roasting time 15min. After roasting, they are taken out and allowed to cool naturally to obtain vanadium-titanium pellets. Finally, the compressive strength of the cooled vanadium-titanium pellets is tested.

[0068] The following provides specific comparative indicators for the raw and finished pellets of Comparative Example 1 and Examples 1-4.

[0069] Comparative Example 1

[0070] The green pellets, with 98% vanadium-titanium iron concentrate and 2% bentonite, exhibit a compressive strength of 10.68 N / pellet, a drop strength of 4.7 times / pellet, a moisture content of 8.04%, and a bursting temperature greater than 600℃. The finished pellets have a compressive strength of 1934 N / pellet, an internal porosity of 18.51%, a ore reduction degree of 65.24%, a hematite phase composition of 92.76%, and a belt roaster utilization coefficient of 0.88 t / (m³). 2 ·h).

[0071] Example 1

[0072] The pellets are composed of 90% vanadium-titanium iron concentrate, 2% bentonite, and 8% finely ground siderite. The green pellets have a compressive strength of 10.47 N / pellet, a drop strength of 4.6 times / pellet, a moisture content of 7.87%, and a bursting temperature greater than 600℃. The finished pellets have a compressive strength of 2214 N / pellet, an internal porosity of 25.42%, a reduction degree of 68.16%, a hematite phase composition of 93.65%, and a belt roaster utilization coefficient of 0.89 t / (m²). 2 ·h).

[0073] Example 2

[0074] The pellets are blended with 80% vanadium-titanium iron concentrate, 2% bentonite, and 18% finely ground siderite. The green pellets have a compressive strength of 10.07 N / pellet, a drop strength of 4.5 times / pellet, a moisture content of 7.78%, and a bursting temperature greater than 600℃. The finished pellets have a compressive strength of 2460 N / pellet, an internal porosity of 34.79%, a reduction degree of 70.06%, a hematite phase composition of 94.59%, and a belt roaster utilization coefficient of 0.90 t / (m²). 2 ·h).

[0075] Example 3

[0076] The mixture consists of 70% vanadium-titanium iron concentrate, 2% bentonite, and 28% finely ground siderite. The green pellets exhibit a compressive strength of 9.56 N / pellet, a drop strength of 4.2 drops / pellet, a moisture content of 7.92%, and a bursting temperature greater than 600℃. The finished pellets have a compressive strength of 2160 N / pellet, an internal porosity of 39.44%, a ore reduction degree of 72.17%, a hematite phase composition of 95.67%, and a belt roaster utilization coefficient of 0.92 t / (m²). 2 ·h).

[0077] Experimental results show that with further increases in the siderite proportion, the drop strength and compressive strength of green pellets decrease to some extent, especially the compressive strength, which is less than 10N, gradually failing to meet production requirements. The reducibility of the pellets is gradually optimized, and the overall quality of vanadium-titanium pellets produced from ultrafine vanadium-titanium concentrate is significantly improved. Furthermore, the replacement of bottom and edge pellets with larger siderite particles increases pellet yield, and the utilization coefficient of the belt roaster increases from 0.88 t / (m²) in Comparative Example 1. 2 •h) increased to 0.92t / (m) in Example 3 2 ·h), production efficiency is significantly improved; however, as the siderite ratio gradually increases, the compressive strength of the finished pellet first increases and then decreases, reaching a maximum of 2460N as in Example 2. If the siderite ratio is further increased, the compressive strength decreases to 2160N. The main reason is that the roasting and decomposition effect increases, the porosity is too developed, and the compressive strength is reduced. Therefore, the optimal range for siderite is 18%±5%.

[0078] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing vanadium-titanium pellets, comprising the following steps: a) After screening and classifying the siderite, the portion smaller than 6mm is finely ground to obtain finely ground siderite. b) After mixing the finely ground siderite obtained in step a) with vanadium-titanium concentrate and bentonite, pelletizing is carried out to obtain green pellets with a particle size of 8~16mm. c) After the green pellets with a particle size of 8-16 mm obtained in step b) are distributed, they are successively dried, preheated and roasted, and then cooled to obtain vanadium-titanium pellets. The screening and grading process yields portions of 6 mm or more and portions of less than 6 mm; the portions of 6 mm or more are used in the fabric application process in step c). The specific process for preparing the fabric is as follows: The siderite particles with a size greater than or equal to 6mm from the screening and grading process in step a) are evenly distributed on the belt roaster trolley to form a base material. The number of material layers is controlled to be 2-3 layers. After the base material is laid, green pellets with a particle size of 8-16mm obtained in step b) are evenly distributed on the base material layer by layer. At the same time, siderite edge material with a size greater than or equal to 6mm is laid on both sides of the green pellets to complete the material laying process. The requirement for the fine grinding process mentioned in step a) is: fine grinding until the proportion of particles smaller than 0.074mm reaches 70%. The mass ratio of finely ground siderite to vanadium-titanium concentrate and bentonite in step b) is (4~14):(35~45):1; The preheating temperature described in step c) is 750℃~850℃.

2. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that, The ball-making process described in step b) is as follows: The mixed materials are added to a disc pelletizer for pelletizing, and the moisture content is controlled at 7.5%~8.5% to obtain green pellets with a particle size of 8~16mm.

3. The method for preparing vanadium-titanium pellets according to claim 2, characterized in that, The specifications of the disc pelletizer are Φ (6000~8000)mm×(900~1100)mm, the rotation speed is 10r / min~30r / min, and the tilt angle is 45°~50°.

4. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that, The drying temperature in step c) is 280℃~320℃, and the time is 20min~40min.

5. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that, The preheating time mentioned in step c) is 5 min to 15 min.

6. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that, The roasting temperature in step c) is 1200℃~1300℃ and the time is 10min~20min.

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