A high-titanium vanadium-titanium magnetite blast furnace smelting method

Abstract

The application discloses a high-titanium vanadium-titanium magnetite blast furnace smelting method and belongs to the field of vanadium-titanium ore blast furnace utilization. The method is characterized in that: vanadium-titanium magnetite concentrate oxidized pellet and sintered ore are added into a blast furnace to be smelted at a smelting temperature of 1450-1600 DEG C, and vanadium-containing molten iron and titanium-containing blast furnace slag are obtained after smelting; by controlling the mass ratio of the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) of the slag, the mass ratio of CaO / MgO and the mass ratio of SiO2 / Al2O3, the smelting can be carried out smoothly under the condition of improving the vanadium-titanium ore ratio in the blast furnace charge and simultaneously reducing the content of TiC in the slag, thereby providing technical support for the industrial application of the blast furnace smelting of a higher proportion and all vanadium-titanium magnetite.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace utilization of vanadium-titanium ore, and relates to a blast furnace smelting method for high-titanium vanadium-titanium magnetite. Background Technology

[0002] Panzhihua-Xichang region in Sichuan Province is a major vanadium-titanium magnetite producing area in my country. Extensive research and practice have been conducted on the utilization of vanadium-titanium resources in this region, resulting in efficient beneficiation technology for Panzhihua vanadium-titanium magnetite, sintering technology for vanadium-titanium magnetite concentrate, and blast furnace smelting technology and practices. However, existing blast furnace processes for vanadium-titanium magnetite ore still have some problems. When the blast furnace temperature is high and fluctuates greatly, or when slag and iron remain in the furnace for a long time, TiO2 in the slag is easily reduced to TiC, TiN, or Ti(C,N) ultra-high melting point phases, causing problems such as slag adhesion, foaming, difficulty in slag-iron separation, high iron loss, and poor slag desulfurization performance. Currently, the blast furnace process at Panzhihua Iron and Steel Group only recovers iron and vanadium, with about 30% ordinary iron ore added during the smelting process. The TiO2 content in the slag is only 21-23 wt.%, and this portion of titanium resources has not been economically and effectively recovered due to its low titanium enrichment rate. Other methods for utilizing vanadium-titanium magnetite include non-blast furnace methods, but considering factors such as scale, cost, and environmental impact, the blast furnace process will remain significantly advantageous for the foreseeable future. Therefore, addressing the titanium recovery challenges inherent in the blast furnace method, overcoming the bottlenecks in blast furnace smelting of whole vanadium-titanium ore, obtaining high-grade, high-titanium blast furnace slag, and achieving effective titanium recovery and utilization are effective approaches to the comprehensive utilization of vanadium-titanium magnetite using the blast furnace method.

[0003] The blast furnace process is the main method for smelting vanadium-titanium magnetite concentrate in my country, and the sintering and pelletizing process is the main method for preparing blast furnace feedstock. Vanadium-titanium magnetite concentrate needs to be processed into mature feedstock before being fed into the furnace. In the blast furnace smelting process of vanadium-titanium magnetite concentrate in the Panzhihua-Xichang region, titanium oxides are reduced to low-valence titanium oxides and high-melting-point substances such as titanium carbonitride, causing the slag to thicken and affecting the smooth operation of smelting. To reduce the adverse effects of titanium over-reduction, the TiO2 grade in the blast furnace process in the Panzhihua-Xichang region needs to be controlled below 25%, thus limiting the proportion of vanadium-titanium magnetite in the blast furnace feedstock.

[0004] Therefore, in order to improve the efficiency of subsequent titanium extraction processes, the titanium content in the slag can be increased by increasing the proportion of vanadium-titanium magnetite in the furnace charge. This also raises an urgent need for targeted research and development of blast furnace slag-making systems in high-titanium environments. Summary of the Invention

[0005] To address the problems in existing vanadium-titanium magnetite blast furnace smelting processes, such as low vanadium-titanium magnetite ratio in the furnace charge, the need for adding a large amount of iron ore, low titanium grade in the slag, and difficulty in separating molten iron and slag, the present invention aims to provide a high-titanium vanadium-titanium magnetite blast furnace smelting method. This method increases the vanadium-titanium ore ratio in the blast furnace charge while simultaneously reducing the TiC content in the slag, thereby ensuring smooth smelting and facilitating the separation of vanadium-containing molten iron and titanium-containing blast furnace slag.

[0006] In order to achieve the above-mentioned technical objectives, the present invention aims to provide a blast furnace smelting method for high-titanium vanadium-titanium magnetite, which involves adding a furnace charge containing vanadium-titanium magnetite concentrate oxide pellets, sintered ore, and coke into a blast furnace and smelting at a smelting temperature of 1450~1600℃ to obtain vanadium-containing molten iron and titanium-containing blast furnace slag.

[0007] The titanium-containing blast furnace slag contains a TiO2 content greater than or equal to 25 wt%;

[0008] The mass ratios of the components in the titanium-containing blast furnace slag are as follows: the mass ratio of quaternary basicity (CaO+MgO) / (SiO2+Al2O3) ranges from 1.0 to 1.6; the mass ratio of CaO / MgO ranges from 1.5 to 3; and the mass ratio of SiO2 / Al2O3 ranges from 2.0 to 3.0.

[0009] The blast furnace process is my country's industrialized method for smelting vanadium-titanium magnetite concentrate. During smelting, most of the vanadium enters the molten iron, forming vanadium-containing iron, which is subsequently recovered and reused through a converter vanadium extraction process. Titanium mainly exists in the blast furnace slag as a perovskite phase. The TiO2 content in the titanium-containing slag is below 25%, making it difficult to economically recover and resulting in waste slag accumulation and environmental problems. In the blast furnace smelting process, coke acts as both a heater and a reducing agent. Under the high temperature and excess carbon conditions in the compacted coke zone of the blast furnace, titanium oxides are reduced to low-valence titanium oxides and high-melting-point substances such as TiC, causing the slag to thicken and affecting the smooth operation of the smelting process. This is the main reason why the TiO2 content in the blast furnace slag needs to be controlled. Therefore, the key to blast furnace smelting of vanadium-titanium magnetite is to suppress the formation of titanium carbide.

[0010] To address the aforementioned key issues, this invention proposes a blast furnace smelting method for high-titanium vanadium-titanium magnetite. Through extensive research and analysis of the influence of slag composition on titanium carbide formation, a slag composition range that can suppress titanium carbide formation at high titanium grades was identified. Within the preferred slag composition range of this invention, the quaternary basicity is at a higher level than that of current vanadium-titanium ore blast furnace slag. Increased quaternary basicity leads to the introduction of more Ca... 2+ Mg 2+ Ca 2+ Mg 2+TiO2 reacts with TiO2 to form recalcitrant minerals such as CaTiO3 and MgTiO3, reducing the activity of titanium oxides in the slag and controlling over-reduction of titanium oxides. This reduces the amount of titanium carbide formed, thereby alleviating the viscosity and fluidity issues of the slag. The slag-forming system developed in this invention for blast furnace smelting of high-ratio vanadium-titanium magnetite is of great significance for improving the proportion of vanadium-titanium ore in blast furnace burdens and promoting industrial applications. Furthermore, when the CaO / MgO mass ratio is controlled within the range of this invention, it is beneficial to generate a magnesium-titanium phase with a relatively low melting point through an appropriate amount of MgO, thus more easily reducing the activity of free TiO2. Conversely, when the SiO2 / Al2O3 mass ratio is controlled within the range of this invention, it is beneficial to control the viscosity of the slag, ensuring that the slag maintains suitable fluidity and thermal stability even with a high TiO2 content.

[0011] As a preferred embodiment, when the TiO2 content is greater than or equal to 25% and less than 28%, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.1 to 1.6; the CaO / MgO mass ratio ranges from 1.5 to 3; and the SiO2 / Al2O3 mass ratio ranges from 2.0 to 3.0. When the TiO2 content is greater than or equal to 28% and less than 30%, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.1 to 1.6. The mass ratio ranges from 1.2 to 1.5; the CaO / MgO mass ratio ranges from 1.5 to 2.5; the SiO2 / Al2O3 mass ratio ranges from 2.0 to 3.0; when the TiO2 content is greater than or equal to 30% and less than or equal to 35%, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.2 to 1.5; the CaO / MgO mass ratio ranges from 1.5 to 3; and the SiO2 / Al2O3 mass ratio ranges from 2.0 to 3.0. Within further optimized ranges, the TiO2 content in the slag can be further increased and the TiC content in the slag can be reduced, achieving smooth separation of vanadium-containing molten iron and slag.

[0012] As a preferred embodiment, the vanadium-titanium magnetite concentrate oxide pellets are at least one of acidic pellets, self-fluxing pellets, and basic pellets, with the pellet content in the furnace charge being ≥70 wt%. The use of a higher proportion of pellets in the furnace charge structure of this invention not only helps reduce carbon emissions from blast furnace smelting but also facilitates the production of more suitable titanium-containing blast furnace slag in subsequent smelting processes, while simultaneously reducing the difficulty of separating vanadium-containing molten iron and titanium-containing blast furnace slag.

[0013] Furthermore, the proportion of pellets in the furnace charge is 80-90 wt%.

[0014] As a preferred embodiment, the vanadium-titanium magnetite concentrate oxidized pellets are obtained by mixing vanadium-titanium magnetite concentrate with slag-forming flux 1, followed by pelletizing and oxidative roasting.

[0015] As a preferred embodiment, the vanadium-titanium magnetite concentrate oxide pellets contain the following components: TFe: 50~60wt%, TiO2: 8~16wt%, SiO2: 2~7wt%, CaO: 0.1~9.0wt%, MgO: 2.0~6.0wt%, Al2O3: 1~6wt%, V2O5: 0.3~2.0wt%.

[0016] As a preferred embodiment, the sinter is obtained by sintering iron ore and / or steel plant scraps with slag-forming flux 2, wherein the TiO2 content in the sinter does not exceed 0.5 wt%, and the basicity is 1.8~2.5. The steel plant scraps include at least one of sintered return ore, steel slag, and dust collector ash.

[0017] As a preferred embodiment, the sintered ore comprises the following components: TFe: 50~60wt%, TiO2: 0~0.5wt%, SiO2: 4~8wt%, CaO: 8~20wt%, MgO: 2~6wt%, Al2O3: 0~3wt%, V2O5: 0~1wt%.

[0018] As a preferred embodiment, both the slag-forming flux 1 and the slag-forming flux 2 contain calcium-containing flux, magnesium-containing flux, and silicon-containing flux.

[0019] Currently, the slag-forming flux for vanadium-titanium magnetite blast furnace smelting is mainly added during the sintering process to prepare sintered ore. However, this invention also adds the slag-forming flux to the pellets, making the chemical composition of the blast furnace charge more uniform and stable. This is beneficial for controlling the quaternary basicity, CaO / MgO ratio, and SiO2 / Al2O3 ratio of the slag during blast furnace smelting, and also enhances the blast furnace's adaptability to raw material fluctuations, reducing the difficulty of slag control during the smelting process.

[0020] As a preferred embodiment, the calcium-containing flux includes at least one of lime, limestone, dolomite, quicklime, calcium oxide, calcium carbonate, and high-calcium slag with a CaO content ≥ 40 wt%.

[0021] As a preferred embodiment, the magnesium-containing flux includes at least one of dolomite, magnesite, magnesium oxide, magnesium carbonate, and high-magnesium slag with MgO ≥ 40 wt%.

[0022] As a preferred embodiment, the silicon-containing flux includes at least one of silica, quartz, serpentine, and high-silica slag with SiO2 ≥ 40 wt%.

[0023] As a preferred embodiment, the smelting process is carried out using all-oxygen conditions. This invention, by smelting under all-oxygen conditions, effectively increases the oxygen potential within the furnace, inhibits the carburization and nitriding reactions of titanium, thereby further controlling the formation of TiC and ensuring smooth smelting operations.

[0024] As a preferred embodiment, the vanadium-containing molten iron is used for vanadium extraction in a converter, and the titanium-containing slag is used for titanium extraction. By controlling the composition of the titanium-containing slag, this invention facilitates further resource recovery and utilization of vanadium and titanium, while reducing process complexity.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The blast furnace smelting method for high-titanium vanadium-titanium magnetite of the present invention can control the over-reduction of titanium oxides by controlling the mass ratio of the quaternary basicity (CaO+MgO) / (SiO2+Al2O3), the mass ratio of CaO / MgO and the mass ratio of SiO2 / Al2O3 in the slag. This can reduce the generation of high-melting-point substances, thereby reducing the viscosity and fluidity of the slag and obtaining slag with high titanium grade. At the same time, it can also reduce the TiC content in the slag to below 11.28wt%, thereby achieving the smooth separation of vanadium-containing molten iron and titanium-containing blast furnace slag.

[0027] (2) The raw materials of the method of the present invention are readily available and the cost is low, and it has the potential for industrial application.

[0028] (3) The present invention also adds slag-forming flux to the pellets, which makes the chemical composition of the blast furnace charge more uniform and stable, which is conducive to the control of slag quaternary basicity, CaO / MgO ratio and SiO2 / Al2O3 ratio during blast furnace smelting, and also enhances the adaptability of the blast furnace to raw material fluctuations and reduces the difficulty of slag control during smelting. Detailed Implementation

[0029] The specific embodiments of the present invention will be further illustrated below, but the specific embodiments of the present invention are not limited to the following embodiments.

[0030] The preparation of oxide pellets and sinter in the blast furnace smelting method of high-titanium vanadium-titanium magnetite in the embodiments and comparative examples of this invention is as follows:

[0031] Vanadium-titanium magnetite concentrate from the Panzhihua-Xichang region was used, and slag-forming flux 1 was added. Vanadium-titanium magnetite oxide pellets A to C were obtained by pelletizing and oxidative roasting. The particle size of the pellets was 8 to 16 mm.

[0032] The composition of sintered ore A and sintered ore B is obtained by sintering ordinary iron ore with slag-forming flux 2.

[0033] Among them, slag-forming flux 1 includes quicklime, limestone, dolomite, magnesite, silica, magnesium-containing slag, etc.; slag-forming flux 2 includes quicklime, limestone, dolomite, magnesite, etc.

[0034] The main components of vanadium-titanium magnetite concentrate include: TFe: 50~60wt%, TiO2: 5~15wt%, SiO2: 1~5wt%, CaO: 0.1~5wt%, MgO: 1~6wt%, Al2O3: 1~5wt%, V2O5: 0.5~2wt%.

[0035] The main components of common iron ore include: TFe: 55~65wt%, SiO2: 3~8wt%, CaO: 0.1~2wt%, MgO: 0.1~2wt%, Al2O3: 0~3wt%.

[0036] The specific chemical compositions of the obtained oxide pellets and sinters are shown in Table 1.

[0037]

[0038] Example 1

[0039] A blast furnace smelting method for high-titanium vanadium-titanium magnetite:

[0040] Vanadium-titanium magnetite concentrate oxide pellets and sinter were mixed to form the furnace charge structure, with vanadium-titanium magnetite concentrate oxide pellets accounting for 70 wt% and sinter accounting for 30 wt%. The furnace charge structure is shown in Table 2. The mixture was then added to the blast furnace, along with coke at a relative total charge amount of 31 wt%, and smelted at a smelting temperature of 1520℃. After smelting, vanadium-containing molten iron and titanium-containing blast furnace slag were obtained. The vanadium-containing molten iron can be used for vanadium extraction in a converter. The composition of the titanium-containing slag is shown in Table 2. This slag can be further used for titanium extraction.

[0041] In this embodiment, the vanadium-titanium magnetite concentrate oxide pellets used are 20wt% pellet A + 50wt% pellet B, and the sinter is 15wt% sinter A + 15wt% sinter B.

[0042] Example 2

[0043] A blast furnace smelting method for high-titanium vanadium-titanium magnetite:

[0044] Vanadium-titanium magnetite concentrate oxide pellets and sinter were mixed to form the furnace charge structure, with vanadium-titanium magnetite concentrate oxide pellets accounting for 80 wt% and sinter accounting for 20 wt%. The furnace charge structure is shown in Table 2. The mixture was then added to the blast furnace, along with coke at a relative total charge amount of 30.8 wt%, and smelted at a smelting temperature of 1534℃. After smelting, vanadium-containing molten iron and titanium-containing blast furnace slag were obtained. The vanadium-containing molten iron can be used for vanadium extraction in a converter. The composition of the titanium-containing slag is shown in Table 2. This slag can be further used for titanium extraction.

[0045] In this embodiment, the vanadium-titanium magnetite concentrate oxide pellets used are 9wt% pellet A + 71wt% pellet B, and the sinter is 20wt% sinter A.

[0046] Example 3

[0047] A blast furnace smelting method for high-titanium vanadium-titanium magnetite:

[0048] Vanadium-titanium magnetite concentrate oxide pellets and sinter were mixed to form the furnace charge structure, with vanadium-titanium magnetite concentrate oxide pellets accounting for 90 wt% and sinter accounting for 10 wt%. The furnace charge structure is shown in Table 2. The mixture was then added to the blast furnace, along with coke at a relative total charge amount of 30.5 wt%, and smelted at a smelting temperature of 1488℃. After smelting, vanadium-containing molten iron and titanium-containing blast furnace slag were obtained. The vanadium-containing molten iron can be used for vanadium extraction in a converter, and the composition of the titanium-containing slag is shown in Table 2. This slag can be further used for titanium extraction.

[0049] In this embodiment, the vanadium-titanium magnetite concentrate oxide pellets used are 3wt% pellet A + 87wt% pellet B, and the sintered ore is 10wt% sintered ore A.

[0050] Example 4

[0051] A blast furnace smelting method for high-titanium vanadium-titanium magnetite:

[0052] Vanadium-titanium magnetite concentrate oxide pellets were added to a blast furnace, along with coke at a relative total charge of 30.3 wt%, and smelted at a temperature of 1560℃. The smelting process yielded vanadium-containing molten iron and titanium-containing blast furnace slag. The vanadium-containing molten iron could be used for vanadium extraction in a converter, and the composition of the titanium-containing slag is shown in Table 2. This slag could be further used for titanium extraction.

[0053] The vanadium-titanium magnetite concentrate oxide pellets used in this embodiment are 100wt% pellets A.

[0054] Comparative Example 1

[0055] The only difference between this comparative example and Example 1 is that the proportions of pellets and sinter are replaced with 60wt% and 40wt% respectively. All other steps and conditions are the same. The specific furnace charge structure and slag composition are shown in Table 2.

[0056] The vanadium-titanium magnetite concentrate oxide pellets used in this comparative example consist of 55 wt% pellet A + 5 wt% pellet B, and 40 wt% sinter A.

[0057] Comparative Example 2

[0058] The only difference between this comparative example and Example 1 is that the proportions of pellets and sinter are replaced with 60wt% and 40wt% respectively. All other steps and conditions are the same. The specific furnace charge structure and slag composition are shown in Table 2.

[0059] The vanadium-titanium magnetite concentrate oxide pellets used in this comparative example consisted of 60 wt% pellets (C) and 40 wt% sinter (A).

[0060]

[0061] Table 2 shows the quaternary basicity, SiO2 / Al2O3, CaO / MgO, and TiO2 content in different blast furnace burden structures and corresponding slag systems. As can be seen from the table, in Examples 1-4, the proportion of pellets continuously increases while the proportion of sinter continuously decreases. After smelting, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) in the slag system composition is 1.32, 1.32, 1.317, and 1.286, respectively, decreasing continuously with increasing pellet proportion. The SiO2 / Al2O3 ratio is 2.65, 2.66, 2.66, and 2.58, also decreasing continuously with increasing pellet proportion. The CaO / MgO ratio is 2.42, 2.54, 2.50, and 2.51, also decreasing continuously with increasing pellet proportion. The TiO2 content is 25%, 27%, 29%, and 31%, respectively, increasing continuously with increasing pellet proportion. The composition of Examples 1-4 conforms to the slag-forming principle of this invention, while the composition of the comparative examples does not conform to the slag-forming principle of this invention.

[0062] Furthermore, in Examples 1-4, as the pellet ratio increased, the TiO2 content in the slag significantly increased, and the TiC content in the slag increased accordingly. Specifically, when the pellet ratio increased from 70 wt% to 100 wt%, the TiO2 content in the slag increased from 25 wt% to 31 wt%, and the TiC formation in the slag increased from 4.41 wt% to 11.28 wt%. In Comparative Example 1, the TiO2 content in the slag was the same as in Example 1, but the TiC content in the slag decreased by 7.34 wt%. In Examples 2-4, even after the TiO2 content in the slag increased, the TiC content in the slag was still lower than in Comparative Example 1. The composition of Comparative Example 2 was significantly higher than the scope of this invention. Although the TiC content in the slag was still lower than in Example 3, the excessively high quaternary basicity led to an increase in melting temperature, making slag-iron separation difficult. This demonstrates that adjusting the quaternary basicity, SiO2 / Al2O3, and CaO / MgO can solve the problem of increased TiC content in the slag caused by increased TiO2 content.

[0063] The above data also demonstrates that increasing the proportion of vanadium-titanium magnetite pellets inevitably leads to an increase in the TiO2 content in the slag (greater than the current 22-25 wt%), and the increased TiO2 content leads to an increase in the high-melting-point TiC content in the slag. This invention uses quaternary basicity, SiO2 / Al2O3, and CaO / MgO as regulating factors for slag composition. By adjusting the quaternary basicity, SiO2 / Al2O3, and CaO / MgO, the slag composition is determined, more comprehensively reflecting the influence of each component on slag performance. This allows for a reduction in TiC content in the slag while increasing the TiO2 content, and also ensures suitable melting temperature and fluidity of the slag.

[0064] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the inventive concept should also be considered within the scope of protection of the present invention.

Claims

1. A blast furnace smelting method for high-titanium vanadium-titanium magnetite, characterized in that: The furnace charge and coke containing vanadium-titanium magnetite concentrate oxide pellets, sintered ore and coke are added into the blast furnace and smelted at a smelting temperature of 1450~1600℃ to obtain vanadium-containing molten iron and titanium-containing blast furnace slag. The titanium-containing blast furnace slag contains a TiO2 content greater than or equal to 25 wt%; The mass ratio of the components in the titanium-containing blast furnace slag is as follows: The quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.0 to 1.6; The mass ratio of CaO / MgO ranges from 1.5 to 3; the mass ratio of SiO2 / Al2O3 ranges from 2.0 to 3.

0.

2. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: When the TiO2 content is greater than or equal to 25% and less than 28%, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.1 to 1.6; the CaO / MgO mass ratio ranges from 1.5 to 3; and the SiO2 / Al2O3 mass ratio ranges from 2.0 to 3.

0. When the TiO2 content is greater than or equal to 28% and less than 30%, the quaternary basicity (CaO+MgO) / (SiO2+Al2O3) mass ratio ranges from 1.2 to 1.5; the CaO / MgO mass ratio ranges from 1.5 to 2.5; and the SiO2 / Al2O3 mass ratio ranges from 2.0 to 3.

0. When the TiO2 content is greater than or equal to 30% and less than or equal to 35%, the mass ratio of quaternary basicity (CaO+MgO) / (SiO2+Al2O3) ranges from 1.2 to 1.5; the mass ratio of CaO / MgO ranges from 1.5 to 3; and the mass ratio of SiO2 / Al2O3 ranges from 2.0 to 3.

0.

3. A blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 1 or 2, characterized in that: The vanadium-titanium magnetite concentrate oxide pellets are at least one of acidic pellets, self-fluxing pellets, and basic pellets, and the pellet content in the furnace charge is ≥70wt%.

4. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 3, characterized in that: The vanadium-titanium magnetite concentrate oxide pellets are obtained by mixing vanadium-titanium magnetite concentrate with slag-forming flux 1, followed by pelletizing and oxidative roasting.

5. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 3, characterized in that: The vanadium-titanium magnetite concentrate oxide pellets contain the following components: TFe: 50~60wt%, TiO2: 8~16wt%, SiO2: 2~7wt%, CaO: 0.1~9.0wt%, MgO: 2.0~6.0wt%, Al2O3: 1~6wt%, V2O5: 0.3~2.0wt%.

6. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: The sintered ore is obtained by sintering iron ore and / or miscellaneous materials from steel plants with slag-forming flux 2. The TiO2 content in the sintered ore does not exceed 0.5 wt%, and the basicity is between 1.8 and 2.

5. The steel plant miscellaneous materials include at least one of sintering return ore, steel slag, and dust removal ash.

7. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 5, characterized in that: The sintered ore contains the following components: TFe: 50~60wt%, TiO2: 0~0.5wt%, SiO2: 4~8wt%, CaO: 8~20wt%, MgO: 2~6wt%, Al2O3: 0~3wt%, V2O5: 0~1wt%.

8. The blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 5, characterized in that: Both the slag-forming flux 1 and the slag-forming flux 2 contain calcium-containing flux, magnesium-containing flux, and silicon-containing flux.

9. A blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 8, characterized in that: The calcium-containing flux includes at least one of lime, limestone, dolomite, quicklime, calcium oxide, calcium carbonate, and high-calcium slag with a CaO content ≥ 40 wt%. The magnesium-containing flux includes at least one of dolomite, magnesite, magnesium oxide, magnesium carbonate, and high-magnesium slag with MgO ≥ 40 wt%. The silicon-containing flux includes at least one of silica, quartz, serpentine, and high-silica slag with SiO2 ≥ 40 wt%.

10. A blast furnace smelting method for high-titanium vanadium-titanium magnetite according to claim 1, characterized in that: The smelting process is carried out using all-oxygen smelting. The vanadium-containing molten iron is used for vanadium extraction in a converter, and the titanium-containing slag is used for titanium extraction.

Images