Method for preparing high-alkalinity sinter from low-iron high-titanium high-vanadium magnetite

Abstract

The invention belongs to the technical field of vanadium titano-magnetite sintering, and particularly discloses a method for preparing high-alkalinity sinter from low-iron high-titanium high-vanadium magnetite. The method for preparing the sintered ore provided by the invention comprises the following steps: crushing low-iron high-titanium high-vanadium magnetite, sulfuric-acid slag, a flux and a carbon-containing fuel; 20-40 parts of low-iron, high-titanium and high-vanadium magnetite, 6-20 parts of sulfuric-acid slag, 8-24 parts of flux, 2-4 parts of carbon-containing fuel and 6-12 parts of return mine are blended, and a mixture is formed; and adding water into the mixture, granulating to obtain a ball material, and sintering to obtain the sintered ore. According to the method, the solid waste sulfuric-acid residue is added in the ore blending process, element regulation and control of the sintered material are achieved, and resource reutilization of the solid waste sulfuric-acid residue can also be achieved; a flux is added in the sintering process, and high-quality binder phase calcium ferrite is generated under lower alkalinity by regulating and controlling sintering alkalinity and element composition, so that the strength performance of the sintered ore is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vanadium-titanium magnetite sintering, and particularly relates to a method for preparing high-basicity sintered ore from low-iron high-titanium high-vanadium magnetite. BACKGROUND

[0002] Vanadium-titanium magnetite is an important iron ore resource, which contains rich vanadium and titanium elements and has high economic value. However, due to its special mineral composition and physical and chemical properties, there are many challenges in the sintering process of vanadium-titanium magnetite. In the early 21st century, vanadium-titanium magnetite veins were discovered in the western region of Liaoning Province, China, and the total proven reserves currently reach 20 billion tons. The vanadium-titanium magnetite resources in this region have low iron grade and high titanium content, and the TiO2 content in the concentrate is often more than 15%. This high-titanium feature often leads to insufficient sinter strength, too little liquid phase, poor reduction performance, and low production efficiency in the sintering process.

[0003] At present, for the sintering production of high-titanium magnetite, a large amount of ordinary iron ore is often added for dilution, or silica and other fluxes are added to guide the generation of liquid phase. This kind of method guides the development of silicate liquid phase in the sintering process, and the sintered ore obtained has problems such as poor mechanical strength and low yield. Increasing the basicity of sintering can effectively develop calcium ferrite phase, increase the amount of liquid phase generated in the sintering process, and improve the strength of the finished sintered ore. However, due to the presence of considerable titanium in the low-iron high-titanium high-vanadium magnetite concentrate in western Liaoning, this part of titanium will preferentially generate calcium titanate with high melting point with calcium oxide, which has a negative impact on sintering. In the sintering process of low-iron high-titanium high-vanadium magnetite, a very high basicity is required to develop calcium ferrite phase (theoretical calculation results show that the basicity needs to be increased to more than 4.0). Therefore, low-iron high-titanium high-vanadium magnetite concentrate often needs to be mixed with high-grade ordinary ore in the sintering process. However, the price of high-grade ordinary iron ore is high, which leads to an increase in the cost of sintering.

[0004] Therefore, it is urgent to optimize and improve the sintering process of low-iron high-titanium high-vanadium magnetite, reduce the production cost, and improve the performance of the finished sintered ore. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite, which solves the problems existing in the prior art by optimizing the sintering process parameters and the raw material ratio, and prepares finished sintered ore with excellent performance. In the ore blending process, solid waste sulfuric acid slag is added to realize element regulation of the sintered material, and the resource recycling of solid waste sulfuric acid slag is also realized. At the same time, the high iron content of the solid waste sulfuric acid slag is used to dilute the excessively high titanium element in the low-iron high-titanium high-vanadium magnetite concentrate. In the sintering process, flux is added for alkalinity adjustment, and through element composition regulation, high-quality calcium ferrite bonding phase is generated at a lower alkalinity, effectively improving the sintering strength of the low-iron high-titanium high-vanadium concentrate, and also having the advantages of reducing production cost and improving enterprise efficiency.

[0006] The present application also provides a method for preparing sintered ore product from low-iron high-titanium high-vanadium magnetite.

[0007] In a first aspect of the present application, a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite is provided, comprising the following steps:

[0008] S1, crushing low-iron high-titanium high-vanadium magnetite, sulfuric acid slag, flux and carbon-containing fuel;

[0009] S2, according to the weight fraction, 20-40 parts of low-iron high-titanium high-vanadium magnetite, 6-20 parts of sulfuric acid slag, 8-24 parts of flux, 2-4 parts of carbon-containing fuel and 6-12 parts of returned ore are blended to form a mixture;

[0010] S3, water is added to the mixture to obtain spherical material, and sintering is carried out to obtain sintered ore.

[0011] The present application uses sulfuric acid slag to replace traditional high-grade iron ore, and adds low-iron high-titanium high-vanadium magnetite for sintering, which has multiple advantages: the TFe of sulfuric acid slag is relatively high, and the cost of solid waste is extremely low, which can replace high-grade ordinary iron ore at low cost to dilute titanium in the sintering process, making it possible to develop calcium ferrite phase at a lower alkalinity; sulfuric acid slag is a hazardous waste, and improper handling can lead to heavy metal pollution and soil acidification, affecting the ecological environment and human health. The method of the present application realizes safe, effective and environmentally friendly disposal of solid waste sulfuric acid slag. The addition of sulfuric acid slag can improve the total iron (TFe) grade of the pellet, which is beneficial to improving the blast furnace smelting into the furnace grade and reducing the ironmaking cost. Through resource utilization of solid waste, waste discharge is reduced, which is in line with the concept of green and sustainable development.

[0012] According to some embodiments of the present application, the crushing in step S1 makes the particle size of the low-iron high-titanium high-vanadium magnetite to be greater than or equal to 50% of -0.074 mm, the particle size of the sulfuric acid residue to be greater than or equal to 80% of -0.074 mm, the particle size of the flux to be greater than or equal to 90% of -3 mm, and the particle size of the carbon-containing fuel to be greater than or equal to 90% of -3 mm.

[0013] According to some embodiments of the present application, the sulfuric acid residue is a chemical waste residue generated in the process of producing sulfuric acid or sulfurous acid from pyrite or pyrite.

[0014] According to some embodiments of the present application, the sulfuric acid residue contains, in terms of percentage by weight, TFe: 60% to 66%, SiO2: 2% to 6%, CaO: 0.1% to 1.5%, Al2O3: 0.5% to 2%, MgO: 0.1% to 2%, FeO: 5% to 20%, and TiO2: not more than 0.5%, and the remainder is impurities.

[0015] According to some embodiments of the present application, the low-iron high-titanium high-vanadium vanadium-titanium magnetite contains, in terms of percentage by weight, TFe: 40% to 50%, SiO2: 4% to 10%, CaO: 3% to 5%, Al2O3: 2% to 3%, MgO: 0.5% to 2%, V2O5: 0.5% to 2.5%, TiO2: 15% to 25%, FeO: 10% to 18%, and the remainder is impurities.

[0016] The present application uses low-iron high-titanium high-vanadium magnetite concentrate as raw material for sintering, adds solid waste sulfuric acid residue, dolomite, limestone, and quicklime, etc. for ore matching, and obtains finished sinter after mixing, granulating, and sintering. By changing the ore matching composition, adjusting the element content, and guiding the generation of high-quality liquid calcium ferrite, the present application effectively solves the problem of insufficient liquid phase in the sintering process of high-titanium iron concentrate, and improves the yield and drum strength of the finished sinter obtained after sintering.

[0017] According to some embodiments of the present application, the flux includes one or more of dolomite, limestone, quicklime, or slaked lime.

[0018] According to some embodiments of the present application, the carbon-containing fuel includes one or more of coke powder, coal powder, biomass, or stone coal.

[0019] According to some embodiments of the present application, the basicity of the mixture in step S2 is controlled to be 2.5 to 4.0.

[0020] The present application further optimizes the amount of solvent suitable for the process of preparing sinter with low-iron high-titanium high-vanadium magnetite and sulfuric acid residue, adjusts the appropriate sintering basicity, generates high-quality binding phase calcium ferrite at a relatively low basicity, effectively improves the sintering strength of low-iron high-titanium high-vanadium concentrate, and at the same time saves the amount of flux and reduces production costs.

[0021] According to some embodiments of the present application, the alkalinity of the mixture in step S2 is controlled to be 2.5-3.5.

[0022] According to some embodiments of the present application, the weight of the water added in step S3 accounts for 7.0%-8.5% of the total weight of the raw materials.

[0023] According to some embodiments of the present application, the spheroidized material in step S3 is a spheroidized material with a particle size of 2-5 mm, and the proportion of the spheroidized material with a particle size of 2-5 mm is ≥70%.

[0024] According to some embodiments of the present application, the specific method of sintering in step S3 is as follows: the mixture is sent into a sintering machine for sintering, the layer height of the material is controlled to be 600-1000 mm, the ignition temperature is controlled to be 1150±50℃, the ignition negative pressure is controlled to be 5-8 kPa, the ignition time is controlled to be 1.5-3 min, rich-oxygen sintering is adopted, 1%-3% oxygen is added, and after sintering, the high-alkalinity sintered ore is obtained through crushing and screening.

[0025] In a second aspect, the present application provides a sintered ore of low-iron high-titanium high-vanadium magnetite, which is prepared by the method for preparing a sintered ore of low-iron high-titanium high-vanadium magnetite according to the first aspect of the present application, and has a yield of ≥70% and a drum strength of ≥60%.

[0026] The present application has the following beneficial effects:

[0027] The present application realizes the resource recycling of solid waste sulfuric acid slag by optimizing the sintering process parameters and adding sulfuric acid slag, and the addition of sulfuric acid slag can effectively dilute the excessively high TiO2 content in the sintered ore, solving the problem that the low-iron high-titanium high-vanadium iron concentrate still has low sintering strength at a high alkalinity. The present application can effectively guide the generation of high-quality calcium ferrite phase during sintering, increase the amount of liquid phase generated during sintering, and thus effectively improve the strength of the sintered ore. By reasonably controlling the material ratio and adjusting the alkalinity of the sintered ore, the present application can ensure sufficient sintering alkalinity while helping to reduce production costs. The present application uses sulfuric acid slag to replace high-priced high-grade iron ore and low-iron high-titanium high-vanadium magnetite for sintering, effectively reducing the process cost of low-iron high-titanium high-vanadium magnetite sintering production, solving the green disposal problem of hazardous waste sulfuric acid slag, and realizing high-quality sintering of low-iron high-titanium high-vanadium magnetite.

[0028] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. DETAILED DESCRIPTION

[0029] The concept and the generated technical effects of the present application will be described clearly and completely in combination with the embodiments below, so as to fully understand the purposes, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0030] The specific conditions not indicated in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products that can be obtained by market purchase.

[0031] Embodiment 1

[0032] The present embodiment provides a method for preparing high-basicity sintered ore from low-iron high-titanium high-vanadium magnetite, and the specific steps are as follows:

[0033] 1) Raw material crushing treatment: the low-iron high-titanium high-vanadium magnetite is crushed to a particle size of less than 0.074 mm, the particle ratio is 67%, the sulfuric acid residue is crushed to a particle size of less than 0.074 mm, the particle ratio is 98%, the fluxes-limestone, dolomite and quicklime are crushed to a particle size of less than 3 mm, the particle ratios are 92%, 93% and 98% respectively, and the coke powder is crushed to a particle size of less than 3 mm, the particle ratio is 95%;

[0034] 2) 25 kg of low-iron high-titanium high-vanadium magnetite, 10 kg of sulfuric acid residue, 3.5 kg of dolomite, 5 kg of limestone, 3 kg of quicklime, 8 kg of returned ore and 3.2 kg of coke are mixed twice, and the basicity of the mixed material is measured to be 3.0, and the total weight of water added to the raw materials is 7.9%; the specific mixing time of the first mixing is 5 min, and water is added during the mixing process, and the mixing time of the second mixing is 15 min;

[0035] 3) The mixed raw materials are sent into a cylindrical granulator, the granulation time is 15 min, the atomized water is sprayed during the granulation process to assist the granulation, the granulation time is 10 min, the granulation and the rotating speed are controlled to be 20 r / min, and the spherical material with a particle size of 2-5 mm is obtained, and the particle size ratio is 75%;

[0036] 4) The spherical material obtained after granulation is sent into a sintering machine for sintering, the material layer height during sintering is 700 mm, the ignition temperature is 1150℃, the ignition negative pressure is 6.9 kPa, the ignition time is 2 min, and 1.5% of oxygen is additionally introduced into the gas flow during sintering, and the high-basicity sintered ore of low-iron high-titanium high-vanadium magnetite is obtained by sintering.

[0037] The sintered ore is tested, the yield is 75.68%, the drum strength is 70.45% (determined according to the GB 8209 standard), and excellent mechanical properties are shown.

[0038] The calculation formula of the sintered ore yield is:

[0039] ;

[0040] The qualified sinter yield refers to the weight of the sinter with a particle size in the range of 5mm to 50mm after screening;

[0041] The total sinter yield refers to the total weight of all the sinter (including qualified products and returned ore) produced by the sintering machine.

[0042] The sulfuric acid residue used in the embodiment is a chemical waste residue generated in the process of producing sulfuric acid or sulfurous acid by using pyrite or pyrite as raw material.

[0043] The main chemical components (mass percentage) of part of the raw materials used in the embodiment and the subsequent specific embodiments are shown in Table 1:

[0044] Table 1

[0045]

[0046] Example 2

[0047] The embodiment provides a method for preparing high-basicity sintered ore from low-iron high-titanium high-vanadium magnetite, and the specific steps are as follows:

[0048] 1) Raw material crushing treatment: the low-iron high-titanium high-vanadium magnetite is crushed to a particle size of less than 0.074mm, the particle ratio is 67%, the sulfuric acid residue is crushed to a particle size of less than 0.074mm, the particle ratio is 98%, the fluxes-limestone, dolomite and quicklime are crushed to a particle size of less than 3mm, the particle ratios are 92%, 93% and 98% respectively, and the coke powder is crushed to a particle size of less than 3mm, the particle ratio is 95%;

[0049] 2) 25kg of low-iron high-titanium high-vanadium magnetite, 8kg of sulfuric acid residue, 7kg of dolomite, 4.2kg of limestone, 3.2kg of quicklime, 9kg of returned ore and 3.2kg of coke are mixed twice, the basicity of the mixed material is measured to be 3.5, and the total weight of water added to the raw materials is 7.8%; the specific two-time mixing is as follows: the first-time mixing time is 10min, and water is added during the mixing process, and the second-time mixing time is 15min;

[0050] 3) The mixed raw materials are sent into a cylindrical granulator, the granulation time is 15min, the atomized water is sprayed during the granulation process to assist the granulation, the granulation time is 10min, the granulation and rotation speed are controlled to be 20r / min, and the spherical material with a particle size in the range of 2mm to 5mm is obtained, and the particle ratio is 81%;

[0051] 4) The ball material obtained after granulation is sent to a sintering machine for sintering, the material layer height during sintering is 750 mm, the ignition temperature is 1200℃, the ignition negative pressure is 6.5 kPa, the ignition time is 2 min, 1.5% of the oxygen gas flow is additionally introduced during sintering, and the high-basicity sintered ore of the low-iron high-titanium high-vanadium magnetite is obtained by sintering.

[0052] The prepared sintered ore is tested, the yield is 78.98%, and the drum strength is 71.67%, which shows excellent mechanical properties.

[0053] Example 3

[0054] The embodiment provides a method for preparing high-basicity sintered ore of low-iron high-titanium high-vanadium magnetite, and the specific steps are as follows:

[0055] 1) Raw material crushing treatment: the low-iron high-titanium high-vanadium magnetite is crushed to a particle size of less than 0.074 mm, the particle size of the sulfuric acid residue is less than 0.074 mm, the particle size of the limestone, dolomite and quicklime is less than 3 mm, and the particle size of the coke powder is less than 3 mm.

[0056] 2) The low-iron high-titanium high-vanadium magnetite 25 kg, the sulfuric acid residue 15 kg, the dolomite 10.5 kg, the limestone 6.3 kg, the quicklime 4.3 kg, the returned ore 9 kg and the coke 3.6 kg are mixed twice, the basicity of the mixed material is 4.0, and the total weight of the water added to the raw material is 8.1%; the specific mixing time of the two times is as follows: the first mixing time is 10 min, and water is added during the mixing process, and the second mixing time is 15 min;

[0057] 3) The mixed raw material is sent into a cylindrical granulator, the granulation time is 15 min, the atomized water is sprayed for auxiliary granulation during the granulation process, the granulation time is 10 min, the rotation speed is controlled to be 20 r / min, and the ball material with a particle size of 2-5 mm is obtained, and the particle size accounts for 81%;

[0058] 4) The ball material obtained after granulation is sent to a sintering machine for sintering, the material layer height during sintering is 820 mm, the ignition temperature is 1200℃, the ignition negative pressure is 6.3 kPa, the ignition time is 2 min, 1.5% of the oxygen gas flow is additionally introduced during sintering, and the high-basicity sintered ore of the low-iron high-titanium high-vanadium magnetite is obtained by sintering.

[0059] The prepared sintered ore is tested, the yield is 79.49%, and the drum strength is 72.80%, which shows excellent mechanical properties.

[0060] Comparative Example 1

[0061] The comparative example provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite. The specific method is basically the same as that of Example 2, and the difference lies in that the raw materials and their amounts in step 2) of the comparative example are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 1.1 kg of dolomite, 0.8 kg of limestone, 1 kg of quicklime, 2.5 kg of return fines, and 1.1 kg of coke.

[0062] Comparative Example 2

[0063] The comparative example provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite. The specific method is basically the same as that of Example 2, and the difference lies in that the raw materials and their amounts in step 2) of the comparative example are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 5.5 kg of dolomite, 3.5 kg of limestone, 2.7 kg of quicklime, 3.1 kg of return fines, and 2.6 kg of coke.

[0064] Comparative Example 3

[0065] The comparative example provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite. The specific method is basically the same as that of Example 2, and the difference lies in that the raw materials and their amounts in step 2) of the comparative example are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 8 kg of ordinary iron ore, 1.0 kg of dolomite, 1.5 kg of limestone, 5.4 kg of quicklime, 3.2 kg of return fines, and 2.6 kg of coke.

[0066] Comparative Example 4

[0067] The comparative example provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite. The specific method is basically the same as that of Example 2, and the difference lies in that the raw materials and their amounts in step 2) of the comparative example are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 20 kg of ordinary iron ore, 1.9 kg of dolomite, 2.2 kg of limestone, 6.9 kg of quicklime, 5 kg of return fines, and 5.3 kg of coke.

[0068] Comparative Example 5

[0069] The comparative example provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite. The specific method is basically the same as that of Example 2, and the difference lies in that the raw materials and their amounts in step 2) of the comparative example are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 8 kg of high-quality high-grade limonite, 1.0 kg of dolomite, 1.8 kg of limestone, 5.1 kg of quicklime, 3.2 kg of return fines, and 2.6 kg of coke.

[0070] Comparative Example 6

[0071] The comparative example 1 provides a method for preparing sintered ore from low-iron high-titanium high-vanadium magnetite, and the specific method is basically the same as that of the example 2, and the difference lies in that the raw materials and the amount of the step 2) of the comparative example 1 are as follows: 25 kg of low-iron high-titanium high-vanadium magnetite, 8 kg of sulfuric acid residue, 2.4 kg of dolomite, 2.7 kg of limestone, 1.5 kg of quicklime, 3.5 kg of returned ore, and 2 kg of coke.

[0072] The alkalinity of the mixture and the performance of the sintered product of each of the above comparative examples are tested and compared with each of the examples, as shown in Table 2.

[0073] Table 2

[0074]

[0075] From the above results, it can be seen that the method for preparing high-alkalinity sintered ore by using low-iron high-titanium high-vanadium magnetite and adding sulfuric acid residue according to the technical scheme of the present application can prepare sintered ore with high yield, excellent strength performance, and qualified quality.

[0076] The comparative example 1 adopts the conventional low-alkalinity ordinary sintering method of low-iron high-titanium high-vanadium magnetite, and does not add sulfuric acid residue for sintering, which lacks the adjusting effect of sulfuric acid residue and the sintering alkalinity is too low, which significantly affects the yield and strength performance of the sintered ore. Although the sintering alkalinity of the comparative example 2 is improved, it lacks the addition of sulfuric acid residue, and it is difficult to solve the problem that the sintering strength of low-iron high-titanium high-vanadium iron concentrate is still low at a high alkalinity (sintering alkalinity of 3.0-4.0). Although the comparative example 6 adds sulfuric acid residue for sintering, the sintering alkalinity is low, which seriously affects the adjusting effect of sulfuric acid residue and the sintering effect, and the performance of the sintered ore product is greatly reduced. The comparative example 3 uses low-iron high-titanium high-vanadium magnetite and adds ordinary iron ore for sintering, which obviously cannot achieve the excellent performance of the sintered ore prepared by adding sulfuric acid residue. The comparative example 4 further increases the amount of added ordinary iron ore, which can effectively improve the strength performance of the prepared sintered ore, but there is still room for improvement, and a large amount of ordinary iron ore addition also leads to an increase in production cost. The comparative example 5 uses high-grade iron ore instead of sulfuric acid residue, which can also prepare sintered ore with high quality, but the cost is obviously high, and the problem of sulfuric acid residue solid waste disposal cannot be solved.

[0077] To sum up, the low-iron high-titanium high-vanadium magnetite sintering technical scheme of the application, on the one hand, by adding low-cost sulfuric acid slag, it plays a role in adjusting the ore structure, and effectively dilutes the excessively high TiO2 content in the sintered ore, solving the problem that the low-iron high-titanium high-vanadium type iron concentrate still has low sintering strength at a higher alkalinity; the method of the application effectively improves the yield and strength performance of the sintered ore after adding sulfuric acid slag by reasonably optimizing the sintering process system, the sulfuric acid slag replaces high-priced high-grade iron ore and low-iron high-titanium high-vanadium magnetite for sintering, effectively reducing the process cost of low-iron high-titanium high-vanadium magnetite sintering production, solving the green disposal problem of dangerous waste sulfuric acid slag, and realizing high-quality sintering of low-iron high-titanium high-vanadium magnetite.

[0078] The above has made a detailed description of the embodiments of the application, but the application is not limited to the above embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the application. In addition, the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite, characterized in that, Includes the following steps: S1. Crushing low-iron, high-titanium, and high-vanadium magnetite, sulfuric acid slag, flux, and carbon-containing fuels; S2. By weight, 20-40 parts of low-iron, high-titanium, and high-vanadium magnetite, 6-20 parts of sulfuric acid slag, 8-24 parts of flux, 2-4 parts of carbon-containing fuel, and 6-12 parts of return ore are mixed to form a mixture. S3. Add water to the mixture, granulate to obtain pellets, sinter to obtain sintered ore.

2. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The crushing process described in step S1 results in the following particle size distribution: -0.074mm ≥ 50% for low-iron, high-titanium, and high-vanadium magnetite; -0.074mm ≥ 80% for sulfuric acid slag; -3mm ≥ 90% for flux; and -3mm ≥ 90% for carbon-containing fuel.

3. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The sulfuric acid residue contains, by weight percentage: TFe: 60%~66%, SiO2: 2%~6%, CaO: 0.1%~1.5%, Al2O3: 0.5%~2%, MgO: 0.1%~2%, FeO: 5%~20%, and TiO2 not exceeding 0.5%, with the remainder being impurities.

4. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The flux includes one or more of dolomite, limestone, quicklime or hydrated lime.

5. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The carbon-containing fuel includes one or more of coke powder, coal powder, biomass, or coal shale.

6. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The alkalinity of the mixture in step S2 is controlled to be 2.5~4.

0.

7. The method for preparing sintered ore from low-iron, high-titanium, and high-vanadium magnetite according to claim 1, characterized in that, The weight of water added in step S3 accounts for 7.0% to 8.5% of the total weight of the raw materials.

8. The method for preparing high-quality sintered ore from low-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that, The pellets mentioned in step S3 are pellets with a particle size range of 2~5mm accounting for ≥70%.

9. The method for preparing high-quality sintered ore from low-iron, high-titanium vanadium-titanium magnetite according to claim 1, characterized in that, The specific method of sintering described in step S3 is as follows: the mixture is fed into a sintering machine for sintering, the material layer height is 600~1000mm, the ignition temperature is controlled at 1150±50℃, the ignition negative pressure is 5~8kPa, the ignition time is 1.5~3min, oxygen-enriched sintering is adopted, and 1%~3% oxygen is added. After sintering, the high-basicity sinter is obtained by crushing and screening.

10. A sintered ore of low-iron, high-titanium, and high-vanadium magnetite, characterized in that, The sinter is prepared by a method for preparing sinter from low-iron, high-titanium, and high-vanadium magnetite as described in any one of claims 1 to 9, wherein the yield of the sinter is ≥70% and the drum strength is ≥60%.

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