Briquetting method for vanadium-titanium concentrate

Abstract

The invention provides application of vanadium-titanium concentrate briquettes in smelting of vanadium-titanium concentrate. The briquetting method for the vanadium-titanium concentrate comprises the following steps that firstly, raw materials composed of the vanadium-titanium concentrate, bentonite and an iron-containing additive are mixed with water to obtain a mixture, and then the mixture is subjected to braising treatment to obtain a treated mixture; pressing the treated mixture obtained in the previous step, and drying to obtain a pressed blank; and finally, preheating and roasting the pressed blank obtained in the previous step, soaking, and cooling to obtain the vanadium-titanium concentrate pressed block. The briquettes prepared through a fixed system replace pellets to be applied to pellet experiments, the problem that in the pellet preparation process, the pellet quality fluctuation is large is effectively solved, the pellet quality and structure change rule is well reflected, and therefore experiment errors are reduced, the experiment amount is reduced, experiments and production are well guided, and the experiment efficiency is improved. The popularization and application prospects are good.

Description

Technical Field

[0001] This invention belongs to the field of experimental technology of vanadium-titanium magnetite pelletizing, and relates to the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting and a briquette method for vanadium-titanium concentrate, particularly a briquette method for vanadium-titanium concentrate. Background Technology

[0002] Vanadium-titanium magnetite is a multi-element symbiotic iron ore composed mainly of iron, vanadium, and titanium. It is one of the most important vanadium-titanium resources in nature, and its development and utilization are of great significance to economic development and the improvement of comprehensive national strength. my country is rich in vanadium-titanium magnetite resources, mainly distributed in Panzhihua-Xichang in Sichuan, Chengde in Hebei, and Chaoyang in Liaoning. However, vanadium-titanium magnetite resources are generally characterized by low grade, high content of gangue components such as calcium, magnesium, silicon, and aluminum, complex ore composition and structure, and similar physicochemical properties, leading to difficulties in the extraction and separation of valuable elements and serious pollution during the production process. Therefore, there is still a need for a large quantity of high-quality iron, titanium, and vanadium raw materials. In view of the characteristics of vanadium-titanium magnetite resources, it is necessary to accelerate the research and development of green and efficient comprehensive utilization technologies for vanadium-titanium magnetite to reduce the generation and emission of pollutants, efficiently recover valuable metals, and reduce the waste of secondary resources.

[0003] In the smelting process of vanadium-titanium magnetite, pelletizing is a more energy-efficient and environmentally friendly method for producing artificial briquettes compared to sintering. Statistical data shows that the energy consumption and gas emissions of the pelletizing process are only 30%–50% and 13% of those of the sintering process, respectively, while also producing products with superior performance. Increasing the proportion of pellets in the blast furnace is a key means to save energy, reduce emissions, improve the overall quality of the furnace charge, and maintain the stable operation of the blast furnace. In particular, with the development of vanadium-titanium magnetite concentrate upgrading technology, the particle size of the concentrate has become severely refined. Its addition to sintering leads to a significant decrease in the quality of the sintered ore. The pelletizing process can significantly improve these problems.

[0004] Therefore, research and improvement of iron ore pellets have been continuously carried out in the industry. In particular, before and during actual production and application, the pellets need to be improved accordingly based on the adjustment of the raw material structure, smelting process parameters and process routes of vanadium-titanium magnetite. In actual industrial processes, technicians also conduct pellet experiments to adjust the pellets in the early stages or at any time, and to test the performance and / or structure of the pellets, thereby further improving the smelting effect of iron ore pellet smelting.

[0005] However, the pelletizing process is complex, involving drying, milling, mixing, batching, pelletizing, drying, preheating, roasting, and cooling. The pelletizing stage, in particular, is problematic. Inconsistencies arise due to varying conditions for mother pellet formation and green pellet growth, differences in operator skill, moisture application, pelletizing time, and feed uniformity. This leads to significant fluctuations in the quality of the produced pellets, especially in compressive strength, which ranges from a high of 3,000-4,000 Newtons per pellet to a low of only 600-700 Newtons per pellet. Therefore, a large sample size is required for averaging, achieving a cumulative average of 2,000 Newtons per pellet, but the variation is still substantial. Significant differences also exist in phase composition and porosity. Frequent material changes result in a large experimental workload and high labor intensity, along with lengthy pelletizing experiments. Consequently, pelletizing experiments often fail to effectively guide on-site production.

[0006] Therefore, finding a more suitable pelleting experiment method that can effectively solve the above-mentioned problems in existing pelleting experiments has become one of the urgent problems to be solved by many front-line researchers in this field. Summary of the Invention

[0007] In view of this, the technical problem to be solved by the present invention is to provide the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting and a briquetting method for vanadium-titanium concentrate. The present invention introduces specifically prepared briquettes into the vanadium-titanium magnet pelletizing experiment process to replace pellets in the experiment, which can effectively reduce experimental errors, reduce the amount of experiments, and better guide experiments and production. It achieves precise guidance for pelletizing experiments while avoiding the large-scale pelletizing testing, reducing labor load, and has good prospects for widespread application. At the same time, the briquetting method is simple, stable, and highly controllable, making it more suitable for industrial production and widespread application.

[0008] This invention provides the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting;

[0009] The briquetting method for the vanadium-titanium concentrate includes the following steps:

[0010] 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture.

[0011] 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank;

[0012] 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

[0013] Preferably, the vanadium-titanium concentrate smelting specifically involves a pelletizing experiment of vanadium-titanium concentrate smelting;

[0014] The pellet experiment specifically refers to a pellet experiment that tests the performance and / or structure of pellets based on one or more of the raw material structure, process parameters, and process routes.

[0015] The specific application is the use of vanadium-titanium concentrate briquettes in the analysis and detection of raw materials for pellet smelting.

[0016] The compressive strength of the vanadium-titanium concentrate briquettes is 100~6000N;

[0017] The porosity of the vanadium-titanium concentrate briquettes is 5% to 30%.

[0018] Preferably, the application specifically involves using vanadium-titanium concentrate briquettes in pelletizing experiments to replace experimental pellets, with the performance and / or structure of the briquettes reflecting the performance and / or structure of the pellets.

[0019] The applications also include those that improve the uniformity and / or stability of analysis and detection in pellet experiments;

[0020] The batch standard deviation of the compressive strength of the vanadium-titanium concentrate briquettes is 50~200.

[0021] The batch standard deviation of the porosity of the vanadium-titanium concentrate briquettes is 0.5~10.

[0022] The batch contains 5 or more samples.

[0023] The present invention also provides a method for briquetting vanadium-titanium concentrate, comprising the following steps:

[0024] 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture.

[0025] 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank;

[0026] 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

[0027] Preferably, the vanadium-titanium concentrate includes high-titanium vanadium-titanium concentrate;

[0028] The vanadium-titanium concentrate has a particle size of 0.074 mm or less, with particles accounting for more than 90% of the total mass of the vanadium-titanium concentrate.

[0029] The vanadium-titanium concentrate, by mass content, comprises: TFe: ≥57%, SiO2: ≤3%, TiO2: ≥9.0%, and V2O5: ≥0.50%.

[0030] The iron-containing additives include secondary recycled materials generated during the production process and / or other iron-containing materials;

[0031] The bentonite has a particle size of 0.074 mm or less, with particles accounting for more than 98% of the total mass of the bentonite.

[0032] The mixing time is 8-12 minutes.

[0033] Preferably, the iron-containing additive includes one or more of the following: sintering dust, steelmaking dust, blast furnace gravity ash, ore bin ash, gas ash, and concentrate.

[0034] The iron-containing additive has a particle size of 0.074 mm or less, which accounts for more than 70% of the total mass of the iron-containing additive.

[0035] The vanadium-titanium concentrate has a mass content of 80% to 95% in the raw material;

[0036] The bentonite content in the raw material is 1% to 3% by mass;

[0037] The iron-containing additive has a mass content of 2% to 20% in the raw material;

[0038] The mass ratio of the water to the raw material is 6% to 8%.

[0039] Preferably, the braising time is 10-15 minutes;

[0040] The pressing pressure is 8~15MPa;

[0041] The pressing time is 10~50s;

[0042] The shape of the pressed blank includes one or more of the following: cylindrical, cubic, elliptical, and spherical.

[0043] The size of the pressed blank is (10~15) mm × (10~15) mm;

[0044] The pressed billet is specifically a green pellet used for pelletizing experiments.

[0045] Preferably, the drying method includes forced-air drying and exhaust drying;

[0046] The temperature for the blower drying is 200~400℃;

[0047] The blowing drying time is 5-7 minutes;

[0048] The temperature for the exhaust drying is 350~450℃;

[0049] The drying time is 5-7 minutes.

[0050] Preferably, the preheating temperature is 800~1000℃;

[0051] The preheating time is 7-10 minutes;

[0052] The roasting temperature is 1150~1300℃;

[0053] The roasting time is 10-15 minutes.

[0054] Preferably, the temperature for heat equalization is 900~1100℃;

[0055] The time for homogenization is 7-10 minutes;

[0056] The cooling temperature is 150~400℃;

[0057] The cooling time is 10-15 minutes;

[0058] The briquettes are specifically finished pellets used in pelletizing experiments.

[0059] This invention provides the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting. The briquette method includes the following steps: first, raw materials consisting of vanadium-titanium concentrate, bentonite, and iron-containing additives are mixed with water to obtain a mixture; then, the mixture is subjected to a curing process to obtain a treated mixture; next, the treated mixture obtained in the above steps is pressed and then dried to obtain a compact; finally, the compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate briquettes. Compared with the prior art, this invention specifically replaces pellets with briquettes prepared through a fixed process in pellet ore experiments, effectively solving the above problems, achieving precise guidance for pellet experiments, avoiding large-scale pellet testing, reducing labor intensity, and demonstrating good application potential.

[0060] This invention avoids large fluctuations in pellet quality caused by differences in personnel operation, moisture injection, pelletizing time, and feed uniformity during pellet preparation through a fixed briquetting system. This better reflects the variation patterns of pellet quality and structure. Furthermore, prioritizing research on pellet experiments under different material conditions and roasting conditions avoids the high labor costs associated with large-scale laboratory experiments and testing, effectively improving experimental research efficiency. Using the briquettes provided by this invention instead of raw pellets for pelletizing experiments effectively improves the uniformity and stability of the furnace charge, providing a technical approach for subsequent industrialization. Simultaneously, this invention pre-screens large-scale experiments, effectively reducing the amount of experimentation and minimizing human error during pelletizing, thus improving experimental accuracy.

[0061] The method provided by this invention can reduce experimental errors and experimental workload, and provides better guidance for experiments and production, with promising prospects for widespread application. Detailed Implementation

[0062] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0063] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0064] The purity of the raw materials used in this invention is not particularly limited. Preferably, the purity is industrial pure or the conventional purity of pellets used in the smelting of vanadium-titanium magnetite is sufficient.

[0065] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0066] In all processes of this invention, the abbreviations are conventional abbreviations in the field. Each abbreviation is clear and unambiguous in its relevant application area, and those skilled in the art can understand its conventional process steps based on the abbreviation.

[0067] This invention provides the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting;

[0068] The briquetting method for the vanadium-titanium concentrate includes the following steps:

[0069] 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture.

[0070] 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank;

[0071] 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

[0072] In this invention, the preferred method for vanadium-titanium concentrate smelting is pelletizing vanadium-titanium concentrate smelting.

[0073] In this invention, the pellet experiment is preferably a pellet experiment that detects the performance and / or structure of pellets based on one or more of the raw material structure, process parameters and process route.

[0074] In this invention, the preferred application is the use of vanadium-titanium concentrate briquettes in the analysis and detection of furnace feed for pellet smelting.

[0075] In this invention, the compressive strength of the vanadium-titanium concentrate briquettes is preferably 100~6000N, more preferably 1000~5000N, and even more preferably 2000~4000N.

[0076] In this invention, the porosity of the vanadium-titanium concentrate briquettes is preferably 5% to 30%, more preferably 10% to 25%, and even more preferably 15% to 20%.

[0077] In this invention, the preferred application is that vanadium-titanium concentrate briquettes are used in pelletizing experiments to replace experimental pellets, and the performance and / or structure of the briquettes reflect the performance and / or structure of the pellets.

[0078] In this invention, the application preferably includes applications that improve the uniformity and / or stability of analysis and detection in pellet experiments.

[0079] In this invention, the batch standard deviation of the compressive strength of the vanadium-titanium concentrate briquettes is preferably 50~200, more preferably 80~170, and even more preferably 110~140.

[0080] In this invention, the batch standard deviation of the porosity of the vanadium-titanium concentrate briquettes is preferably 0.5~10, more preferably 2~8, and even more preferably 4~6.

[0081] In this invention, the number of samples in the batch is preferably greater than or equal to 5, more preferably greater than or equal to 6, and even more preferably greater than or equal to 7.

[0082] This invention provides a method for briquetting vanadium-titanium concentrate, comprising the following steps:

[0083] 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture.

[0084] 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank;

[0085] 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

[0086] This invention first mixes raw materials consisting of vanadium-titanium concentrate, bentonite, and iron-containing additives with water to obtain a mixture, and then subjectes the mixture to a braising process to obtain a treated mixture.

[0087] In this invention, the vanadium-titanium concentrate preferably comprises high-titanium vanadium-titanium concentrate.

[0088] In this invention, the particle size of the vanadium-titanium concentrate is preferably such that particles with a particle size of less than or equal to 0.074 mm account for more than 90% of the total mass of the vanadium-titanium concentrate, more preferably more than 91%, and even more preferably more than 92%.

[0089] In this invention, the vanadium-titanium concentrate preferably comprises, by mass content: TFe: ≥57%, SiO2: ≤3%, TiO2: ≥9.0% and V2O5: ≥0.50%, more preferably TFe: ≥58%, SiO2: ≤2.5%, TiO2: ≥9.5% and V2O5: ≥0.55%, and even more preferably TFe: ≥59%, SiO2: ≤2.0%, TiO2: ≥10.0% and V2O5: ≥0.6%.

[0090] In this invention, the iron-containing additive preferably includes secondary recycled materials generated during the production process and / or other iron-containing materials, more preferably secondary recycled materials generated during the production process or other iron-containing materials.

[0091] In this invention, the preferred particle size of the bentonite is that particles with a particle size of 0.074 mm or less account for more than 98% of the total mass of the bentonite, more preferably more than 98.5%, and even more preferably more than 99%.

[0092] In this invention, the mixing time is preferably 8 to 12 minutes, more preferably 8.5 to 11.5 minutes, more preferably 9 to 11 minutes, and even more preferably 9.5 to 10.5 minutes.

[0093] In this invention, the iron-containing additive preferably includes one or more of sintering dust removal ash, steelmaking dust removal ash, blast furnace gravity ash, ore bin ash, gas ash, and concentrate, and more preferably sintering dust removal ash, steelmaking dust removal ash, blast furnace gravity ash, ore bin ash, gas ash, or concentrate.

[0094] In this invention, the preferred particle size of the iron-containing additive is that particles with a particle size of 0.074 mm or less account for more than 70% of the total mass of the iron-containing additive, more preferably more than 75%, and even more preferably more than 80%.

[0095] In this invention, the mass content of the vanadium-titanium concentrate in the raw material is preferably 80%~95%, more preferably 83%~92%, and even more preferably 86%~89%.

[0096] In this invention, the bentonite content in the raw material is preferably 1% to 3% by mass, more preferably 1.4% to 2.6%, and even more preferably 1.8% to 2.2%.

[0097] In this invention, the iron-containing additive in the raw material preferably has a mass content of 2% to 20%, more preferably 6% to 16%, and even more preferably 10% to 12%.

[0098] In this invention, the mass ratio of the water to the raw material is preferably 6% to 8%, more preferably 6.4% to 7.6%, and even more preferably 6.8% to 7.2%.

[0099] In this invention, the simmering time is preferably 10-15 min, more preferably 11-14 min, and even more preferably 12-13 min.

[0100] The present invention further processes the processed mixture obtained in the above steps by pressing and then drying to obtain a pressed blank.

[0101] In this invention, the pressing pressure is preferably 8~15MPa, more preferably 9~14MPa, more preferably 10~13MPa, and even more preferably 11~12MPa.

[0102] In this invention, the pressing time is preferably 10-50s, more preferably 15-45s, more preferably 20-40s, and even more preferably 25-35s.

[0103] In this invention, the shape of the pressed blank preferably includes one or more of cylindrical, cubic, elliptical and spherical shapes, more preferably cylindrical, cubic, elliptical or spherical.

[0104] In this invention, the dimensions of the pressed blank are preferably (10~15) mm × (10~15) mm, more preferably (11~14) mm × (11~14) mm, and even more preferably (12~13) mm × (12~13) mm. Specifically, the dimensions of the cylindrical shape can be φ10 × 15 mm, the dimensions of the cube shape can be 10 × 10 × 10 mm, the dimensions of the ellipse shape can be φ15 mm for the major axis and φ10 mm for the minor axis, and the dimensions of the sphere shape can be φ10 mm.

[0105] In this invention, the pressed billet is preferably a green pellet used for pelletizing experiments.

[0106] In this invention, the drying method preferably includes forced air drying and exhaust drying.

[0107] In this invention, the temperature of the blower drying is preferably 200~400℃, more preferably 240~360℃, and even more preferably 280~320℃.

[0108] In this invention, the blowing drying time is preferably 5 to 7 minutes, more preferably 5.4 to 6.6 minutes, and even more preferably 5.8 to 6.2 minutes.

[0109] In this invention, the temperature of the exhaust drying is preferably 350~450℃, more preferably 370~430℃, and even more preferably 390~410℃.

[0110] In this invention, the drying time is preferably 5-7 min, more preferably 5.4-6.6 min, and even more preferably 5.8-6.2 min.

[0111] Finally, the compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

[0112] In this invention, the preheating temperature is preferably 800~1000℃, more preferably 840~960℃, and even more preferably 880~920℃.

[0113] In this invention, the preheating time is preferably 7-10 min, more preferably 7.5-9.5 min, and even more preferably 8-9 min.

[0114] In this invention, the calcination temperature is preferably 1150~1300℃, more preferably 1180~1270℃, and even more preferably 1210~1240℃.

[0115] In this invention, the roasting time is preferably 10-15 min, more preferably 11-14 min, and even more preferably 12-13 min.

[0116] In this invention, the temperature for heat equalization is preferably 900~1100℃, more preferably 930~1070℃, even more preferably 950~1050℃, even more preferably 980~1020℃, or 1000℃.

[0117] In this invention, the heating time is preferably 7-10 min, more preferably 7.5-9.5 min, and even more preferably 8-9 min.

[0118] In this invention, the cooling temperature is preferably 150~400℃, more preferably 200~350℃, and even more preferably 250~300℃.

[0119] In this invention, the cooling time is preferably 10-15 min, more preferably 11-14 min, and even more preferably 12-13 min.

[0120] In this invention, the briquette is preferably a finished pellet for pelletizing experiments.

[0121] This invention aims to complete and refine the overall technical solution, better ensure the structure and characteristics of the briquettes, and further improve the uniformity, stability, and preparation efficiency of the briquettes. The application of the aforementioned vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting and a method for briquetting vanadium-titanium concentrate may specifically include the following:

[0122] A method for briquetting vanadium-titanium concentrate, the specific implementation method of which is as follows:

[0123] First, the materials are weighed according to the batching plan. The iron-containing material is ultrafine high-titanium vanadium-titanium magnetite, the binder is bentonite, and the additives are secondary recycled materials / other iron-containing materials in the plant area. The coarse particles in the secondary recycled materials are roller-milled to ensure that the proportion of the part smaller than 0.074mm after roller milling reaches more than 70%.

[0124] Then all materials are put into a high-intensity mixer for mixing. During the mixing process, an appropriate amount of water is added. After the raw materials are fully mixed and moistened, they are put into a specific device for steaming to ensure that the water penetrates into the concentrate.

[0125] A certain amount of the mixed material is weighed using a balance and then placed into a tablet press for tableting according to a specific pressing regime (pressure, pressing time). The tablet press mold can be adjusted as required.

[0126] Finally, the pressed briquettes are placed in a horizontal tube furnace for drying, preheating, roasting, homogenizing, and cooling according to the set roasting regime to form finished vanadium-titanium concentrate briquettes. The performance of the finished briquettes is then tested according to industry standards.

[0127] Furthermore, the above-mentioned briquetting method can be specifically described by the following steps:

[0128] (1) Raw materials: Weigh 80% to 95% of ultrafine high-titanium vanadium-titanium concentrate, 1.0% to 3.0% of bentonite, preferably 2.0%, and 2% of secondary resources / other iron-containing materials by weight percentage. Among them, secondary resources / other iron-containing materials should be passed through the roller mill system first to ensure that the proportion of the part smaller than 0.074mm reaches more than 70%.

[0129] (2) Mixing: Add the above materials to the enhanced mixer for mixing. The mixing time is 8 min to 12 min, preferably 10 min. Add 6 to 8% water, preferably 7%. After mixing, put the mixture into the braising tank for braising treatment. The braising time is 10 to 15 min, preferably 12 min.

[0130] (3) Pressing: Based on the weight of the pellets on site, weigh 2-5g of the mixture using a balance, preferably 3g, and place it into a cylindrical mold with a diameter of 12mm (the size of the mold can be adjusted according to the research needs). Press according to the set pressure and pressure holding time, wherein the pressure is 8-15MPa, preferably 10MPa, and the pressure holding time is 10-50s, preferably 30s. After pressing is completed, remove the press block from the mold for later use.

[0131] (4) Drying: The pressed blocks are dried by blowing and exhaust. The blowing temperature is 200℃~400℃, preferably 250~300℃, and the blowing time is 5min~7min. The exhaust temperature is 350℃~450℃, preferably 380℃~400℃, and the exhaust time is 5min~7min.

[0132] (5) Preheating and calcination: The dried compressed blocks are preheated and calcined. The preheating temperature is 800℃~1000℃, the preheating time is 7min~10min, the calcination temperature is 1150℃~1300℃, and the calcination time is 10min~15min; preferably, the preheating temperature is 900℃~950℃, the preheating time is 9min, the calcination temperature is 1220℃~1270℃, and the calcination time is 12min. After calcination, there is no need to cool to room temperature; the blocks are directly cooled to the homogenization temperature for homogenization.

[0133] (6) Heating and cooling: The roasted briquettes are heated and cooled. The heating temperature is 900℃~1100℃ and the heating time is 7min~10min. The cooling temperature is 150℃~400℃ and the cooling time is 10min~15min.

[0134] (7) Performance testing: The cooled briquette is tested for compressive strength, chemical composition, porosity and microstructure.

[0135] Specifically, the vanadium-titanium concentrate used in the batching has a TFe content of ≥57%, a SiO2 content of ≤3%, a TiO2 content of ≥9.0%, a V2O5 content of ≥0.50%, and a particle size of less than 0.074mm accounting for more than 90%.

[0136] Specifically, the bentonite used in the ingredients has a particle size of less than 0.074 mm, accounting for about 98%.

[0137] Specifically, secondary resources or iron-containing materials include one or more of the following: sintering dust, steelmaking dust, blast furnace gravity ash, ore bin ash, gas ash, ordinary iron concentrate, and imported concentrate.

[0138] Specifically, in the preparation of the pellets compared with the briquettes in this invention, a disc pelletizer is used for pelletizing, wherein the disc pelletizer is Φ1000mm×250mm, with a rotation speed of 10~15r / min and an adjustable tilt angle of 45º~55º.

[0139] Specifically, drying, preheating, calcination, homogenization, and cooling are all carried out in a horizontal tube furnace, and the temperature and high-temperature holding time can be set.

[0140] The above-described steps of this invention provide the application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting and a method for briquetting vanadium-titanium concentrate. Specifically, this invention replaces pellets with briquettes prepared through a fixed process in pellet ore experiments, effectively solving the aforementioned problems, providing precise guidance for pellet experiments, avoiding the large-scale nature of pellet testing, reducing labor intensity, and demonstrating good potential for widespread application.

[0141] This invention avoids large fluctuations in pellet quality caused by differences in personnel operation, moisture injection, pelletizing time, and feed uniformity during pellet preparation through a fixed briquetting system. This better reflects the variation patterns of pellet quality and structure. Furthermore, prioritizing research on pellet experiments under different material conditions and roasting conditions avoids the high labor costs associated with large-scale laboratory experiments and testing, effectively improving experimental research efficiency. Using the briquettes provided by this invention instead of raw pellets for pelletizing experiments effectively improves the uniformity and stability of the furnace charge, providing a technical approach for subsequent industrialization. Simultaneously, this invention pre-screens large-scale experiments, effectively reducing the amount of experimentation and minimizing human error during pelletizing, thus improving experimental accuracy.

[0142] The method provided by this invention can reduce experimental errors and experimental workload, and provides better guidance for experiments and production, with promising prospects for widespread application.

[0143] To further illustrate the present invention, the following describes in detail, with reference to embodiments, the application of vanadium-titanium concentrate briquettes provided by the present invention in vanadium-titanium concentrate smelting and a vanadium-titanium concentrate briquette method. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures, only to further illustrate the features and advantages of the present invention, and not to limit the scope of protection of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0144] Examples and Comparative Examples

[0145] The briquetting method can be specifically described in the following steps:

[0146] (1) Raw materials: Weigh out ultrafine high-titanium vanadium-titanium concentrate, bentonite, and secondary resources by weight percentage. Secondary resources should be passed through a roller mill system first to ensure that the proportion of the part smaller than 0.074mm reaches more than 70%.

[0147] (2) Mixing: Add the above materials to the enhanced mixer for mixing for 10 minutes, and add 7% water. After mixing, put the mixture into the braising tank for braising for 12 minutes.

[0148] (3) Pressing: Based on the weight of the pellets on site, weigh 3g of the mixture using a balance and put it into a cylindrical mold with a diameter of 12mm. Press it according to the set pressure and pressure holding time, where the pressure is 10MPa and the pressure holding time is 30s. After pressing, remove the press block from the mold for later use.

[0149] (4) Drying: After pressing, the compressed blocks are dried by blowing and exhaust. The blowing temperature is 280℃ and the blowing time is 6min. The exhaust temperature is 400℃ and the exhaust time is 6min.

[0150] (5) Preheating and roasting: The dried compressed blocks are preheated and roasted at a temperature of 900℃ for 9 minutes and a roasting temperature of 1250℃ for 12 minutes. After roasting, the blocks are directly cooled to the homogenization temperature for homogenization.

[0151] (6) Heating and cooling: The roasted blocks are heated and cooled. The heating temperature is 900℃ and the heating time is 8min. The cooling temperature is 300℃ and the cooling time is 10min.

[0152] (7) Performance testing: The cooled briquette is tested for compressive strength, chemical composition, porosity and microstructure.

[0153] The physicochemical parameters of the vanadium-titanium concentrate, sintering dust, and bentonite used in the briquetting method of vanadium-titanium concentrate are shown in Table 1, which presents the particle size distribution (wt%) of the vanadium-titanium concentrate, sintering dust, and bentonite provided in the embodiments of the present invention.

[0154] Table 1

[0155]

[0156] The chemical composition indicators of the materials used in Table 1 are as follows:

[0157] Upgraded vanadium-titanium concentrate: w(TFe) 57.50%, w(FeO) > 28%, w(CaO) < 1.0%, w(SiO2) 2.50%, w(Al2O3) 3.50%, w(MgO) 3.00%, w(TiO2) 10.00%, w(V2O5) 0.70%;

[0158] Sintering dust (after roller milling): w(TFe) 45.00%, w(CaO) 15.00%, w(SiO2) 8.00%, w(Al2O3) 3.50%, w(MgO) 2.50%, w(TiO2) 4.00%, w(C) 3.00%;

[0159] Bentonite: w(CaO) 3.00%, w(SiO2) 55.00%, w(Al2O3) 15.00%, w(MgO) 3.00%.

[0160] See Table 2, which shows the raw material ratio (wt%) for preparing vanadium-titanium briquettes in the embodiments of the present invention.

[0161] Table 2

[0162]

[0163] According to the proportions shown in Table 2, vanadium-titanium concentrate, pulverized coal, and bentonite were processed using a briquetting process. To facilitate comparison and understanding of the technical effects of the patented examples of this invention, specific benchmark examples and comparative indicators for each implementation are given below. The benchmark examples were prepared using traditional green pellet preparation methods, while the implementation examples were prepared using a briquetting method. The drop strength test data for the obtained green pellets and green briquettes are shown in Table 3. Table 3 shows the drop strength test data for green pellets and green briquettes in the embodiments of this invention, times / (0.5m).

[0164] Table 3

[0165]

[0166] The compressive strength is shown in Table 4. Table 4 shows the compressive strength test data of green pellets and green compressed blocks in the embodiments of the present invention, N / piece.

[0167] Table 4

[0168]

[0169] As can be seen from Tables 3-4, although the drop strength (the drop strength of green pellets is slightly worse due to the shape difference during the drop process) and compressive strength of green pellets and green briquettes are basically the same and both meet the production requirements, the test data of green briquettes are obviously more stable, with a smaller range and more consistent test data.

[0170] The compressive strength of the finished pellets and finished briquettes is shown in Table 5. Table 5 shows the compressive strength test data of the finished pellets and finished briquettes in the embodiments of the present invention, N / piece.

[0171] Table 5

[0172]

[0173] Porosity is shown in Table 6, which contains porosity test data for finished pellets and finished briquettes in the embodiments of the present invention.

[0174] Table 6

[0175]

[0176] As shown in Tables 5 and 6, the cumulative average compressive strength and porosity of the finished pellets and finished briquettes are basically the same. However, the compressive strength of the finished pellets varies greatly, with the lowest being only 764 N / pellet and the highest reaching 3351 N / pellet, a difference of 2587 N / pellet. In contrast, the highest compressive strength of the finished briquettes is 2351 N / pellet and the lowest is 2067 N / pellet, a difference of only 184 N / pellet. Similarly, regarding porosity, the porosity of the finished pellets ranges from a high of 28.31% to a low of only 15.66%, a difference of 12.65 percentage points. The porosity of the finished briquettes ranges from a high of 23.58% to a low of 20.32%, a difference of 3.26 percentage points. Overall, the compressive strength and porosity of the finished briquettes in the example are more stable. Microstructural analysis of any briquette taken from these examples can more accurately reflect the changes in their quality and metallurgical properties, providing better experimental guidance.

[0177] The application of vanadium-titanium concentrate briquettes provided by this invention in vanadium-titanium concentrate smelting and a briquetting method for vanadium-titanium concentrate have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The above descriptions of the embodiments are only for the purpose of helping to understand the method and core ideas of this invention, including the best mode, and also to enable any person skilled in the art to practice this invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. Application of vanadium-titanium concentrate briquettes in vanadium-titanium concentrate smelting; The briquetting method for the vanadium-titanium concentrate includes the following steps: 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture. 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank; 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

2. The application according to claim 1, characterized in that, The vanadium-titanium concentrate smelting specifically refers to the pelletizing experiment of vanadium-titanium concentrate smelting. The pellet experiment specifically refers to a pellet experiment that tests the performance and / or structure of pellets based on one or more of the raw material structure, process parameters, and process routes. The specific application is the use of vanadium-titanium concentrate briquettes in the analysis and detection of raw materials for pellet smelting. The compressive strength of the vanadium-titanium concentrate briquettes is 100~6000N; The porosity of the vanadium-titanium concentrate briquettes is 5% to 30%.

3. The application according to claim 2, characterized in that, Specifically, the application involves using vanadium-titanium concentrate briquettes in pelletizing experiments to replace experimental pellets, and reflecting the performance and / or structure of the pellets through the properties and / or structure of the briquettes. The applications also include those that improve the uniformity and / or stability of analysis and detection in pellet experiments; The batch standard deviation of the compressive strength of the vanadium-titanium concentrate briquettes is 50~200. The batch standard deviation of the porosity of the vanadium-titanium concentrate briquettes is 0.5~10. The batch contains 5 or more samples.

4. A method for briquetting vanadium-titanium concentrate, characterized in that, Includes the following steps: 1) The raw materials consisting of vanadium-titanium concentrate, bentonite and iron-containing additives are mixed with water to obtain a mixture. The mixture is then subjected to a braising process to obtain a treated mixture. 2) The mixture obtained in the above steps is pressed and then dried to obtain a pressed blank; 3) The compact obtained in the above steps is preheated and roasted, then homogenized and cooled to obtain vanadium-titanium concentrate compacts.

5. The briquetting method according to claim 4, characterized in that, The vanadium-titanium concentrate includes high-titanium vanadium-titanium concentrate. The vanadium-titanium concentrate has a particle size of 0.074 mm or less, with particles accounting for more than 90% of the total mass of the vanadium-titanium concentrate. The vanadium-titanium concentrate, by mass content, comprises: TFe: ≥57%, SiO2: ≤3%, TiO2: ≥9.0%, and V2O5: ≥0.50%. The iron-containing additives include secondary recycled materials generated during the production process and / or other iron-containing materials; The bentonite has a particle size of 0.074 mm or less, with particles accounting for more than 98% of the total mass of the bentonite. The mixing time is 8-12 minutes.

6. The briquetting method according to claim 4, characterized in that, The iron-containing additives include one or more of the following: sintering dust, steelmaking dust, blast furnace gravity ash, ore bin ash, gas ash, and concentrate. The iron-containing additive has a particle size of 0.074 mm or less, which accounts for more than 70% of the total mass of the iron-containing additive. The vanadium-titanium concentrate has a mass content of 80% to 95% in the raw material; The bentonite content in the raw material is 1% to 3% by mass; The iron-containing additive has a mass content of 2% to 20% in the raw material; The mass ratio of the water to the raw material is 6% to 8%.

7. The briquetting method according to claim 4, characterized in that, The braising time is 10-15 minutes; The pressing pressure is 8~15MPa; The pressing time is 10~50s; The shape of the pressed blank includes one or more of the following: cylindrical, cubic, elliptical, and spherical. The size of the pressed blank is (10~15) mm × (10~15) mm; The pressed billet is specifically a green pellet used for pelletizing experiments.

8. The briquetting method according to claim 4, characterized in that, The drying methods include forced-air drying and exhaust drying; The temperature for the blower drying is 200~400℃; The blowing drying time is 5-7 minutes; The temperature for the exhaust drying is 350~450℃; The drying time is 5-7 minutes.

9. The briquetting method according to claim 4, characterized in that, The preheating temperature is 800~1000℃; The preheating time is 7-10 minutes; The roasting temperature is 1150~1300℃; The roasting time is 10-15 minutes.

10. The briquetting method according to claim 4, characterized in that, The temperature for heat homogenization is 900~1100℃; The time for homogenization is 7-10 minutes; The cooling temperature is 150~400℃; The cooling time is 10-15 minutes; The briquettes are specifically finished pellets used in pelletizing experiments.

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