Method for treating titanium-containing blast furnace slag

Abstract

The invention discloses a method for treating titanium-containing blast furnace slag, which comprises the following steps: S101, pretreating the titanium-containing blast furnace slag to remove invalid components in the titanium-containing blast furnace slag; s102, after the pretreated titanium-containing blast furnace slag is subjected to high-temperature carbonization process treatment, carbonized slag with the high TiC content is obtained; wherein the content of TiC in the carbide slag with the high content of TiC is 25wt%-60wt%. According to the method for treating the titanium-containing blast furnace slag, the titanium-containing blast furnace slag is pretreated, invalid components, namely impurities, in the titanium-containing blast furnace slag are removed, enrichment of Ti-containing components is achieved, the pretreated titanium-containing blast furnace slag is subjected to a high-temperature carbonization process to produce carbide slag with high TiC content, and the titanium-containing blast furnace slag is recycled. The method is used for producing refined TiCl4, titanium dioxide or titanium sponge and the like in the next low-temperature chlorination process.

Description

Technical Field

[0001] This invention belongs to the field of wet treatment technology for titanium-containing blast furnace slag, and specifically relates to a method for treating titanium-containing blast furnace slag. Background Technology

[0002] Titanium, as an important strategic metal resource, is widely used in aerospace, chemical, and metallurgical fields. Its efficient recycling and utilization are of great significance to sustainable industrial development. In the comprehensive utilization of vanadium-titanium magnetite, approximately 50% of titanium resources enter the titanium-containing blast furnace slag, a byproduct of smelting, in oxide form (such as CaTiO3 and TiO2). This portion of titanium resources has not been effectively recovered for a long time, resulting in a low overall titanium resource utilization rate, which is insufficient to meet the industrial demand for titanium raw materials. Therefore, developing efficient recovery technologies for titanium resources in titanium-containing blast furnace slag is a key direction to overcome the current resource utilization dilemma.

[0003] Currently, the relatively mature titanium resource recovery technology route in the industry is the "high-temperature carbonization-low-temperature chlorination" titanium extraction process of titanium-containing blast furnace slag. The specific process is as follows: using titanium-containing blast furnace slag and carbonaceous reducing agent as raw materials, molten carbonized slag is obtained by high-temperature melting in an AC electric furnace. The slag discharge process adopts a water quenching process to obtain water-quenched slag. The water-quenched slag is then dehydrated and ground to obtain finished carbonized slag of suitable particle size. The finished carbonized slag is then used in a low-temperature chlorination process to produce titanium dioxide by chlorination, thereby realizing the recovery of titanium resources.

[0004] Although the above technology has enabled the recovery and utilization of titanium resources in titanium-containing blast furnace slag, the TiC content in the finished carbonized slag produced by the high-temperature carbonization process is generally 10%-15%, with the remainder being oxides such as calcium, magnesium, aluminum, and silicon. Using this type of carbonized slag in the chlorination process to produce titanium dioxide will generate a large amount of titanium extraction tailings. These tailings contain chloride ions, and if they are stockpiled, they will cause environmental pollution. Therefore, they need to be treated to render them harmless, which will significantly increase the production cost of the process.

[0005] In summary, existing technologies for obtaining carbide slag suffer from problems such as low titanium content and difficulty in treating pollution from titanium extraction tailings, failing to meet the demand for efficient, low-cost, and environmentally friendly recycling of titanium resources from titanium-containing blast furnace slag. There is an urgent need to develop a titanium resource recycling process for titanium-containing blast furnace slag to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the shortcomings of the existing technology, a method for processing titanium-containing blast furnace slag is provided.

[0007] To achieve the above objectives, the following technical solution is adopted: This invention provides a method for treating titanium-containing blast furnace slag, comprising the following steps: S101. Pre-treat titanium-containing blast furnace slag to remove ineffective components from the titanium-containing blast furnace slag; S102. After the pretreated titanium-containing blast furnace slag is subjected to a high-temperature carbonization process, a high-TiC content carbonized slag is obtained. Among them, the TiC content in the high TiC content carbide slag is 25wt%-60wt%.

[0008] In some embodiments, S101, the preprocessing process includes: S201. Add titanium-containing blast furnace slag to an organic acid solution, heat and stir, then filter to obtain filter residue; S202. Add the filter residue to the alkaline solution, heat and stir, and then filter to obtain the pretreated titanium-containing blast furnace slag.

[0009] In some embodiments, the organic acid solution is a mixture of one or more acids selected from oxalic acid, citric acid, formic acid, and acetic acid, and the concentration of the organic acid solution is 15wt%-40wt%.

[0010] In some embodiments, the solid-liquid ratio of titanium-containing blast furnace slag to organic acid solution in step S201 is 20 g / L-40 g / L.

[0011] In some embodiments, in step S201, the heating temperature is 50℃-100℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min.

[0012] In some embodiments, the alkaline solution is selected from NaOH solution or Na2CO3 solution; wherein the concentration of NaOH solution is 10wt%-30wt% and the concentration of Na2CO3 solution is 20wt%-40wt%.

[0013] In some embodiments, the solid-liquid ratio of the filter residue to the alkaline solution in step S202 is 80 g / L-100 g / L.

[0014] In some embodiments, in step S202, the heating temperature is 80℃-120℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min.

[0015] In some embodiments, the high-temperature carbonization process includes: The pretreated titanium-containing blast furnace slag is mixed with a carbon-containing reducing agent and smelted at 1500℃-1600℃. After slag removal, the slag is water-quenched, dried and ground to obtain carbide slag with high TiC content.

[0016] In some embodiments, the amount of carbon-containing reducing agent added is 10%-15% of the mass of the pretreated titanium-containing blast furnace slag, and the smelting time is 1.5h-3h.

[0017] The present invention has the following beneficial technical effects: This invention discloses a method for treating titanium-containing blast furnace slag. By pre-treating the titanium-containing blast furnace slag to remove ineffective components, i.e., impurities, it achieves the enrichment of Ti-containing components. The pre-treated titanium-containing blast furnace slag is then processed through a high-temperature carbonization process to produce high-TiC content carbide slag, which is used in the subsequent low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, etc. Compared with existing technologies, this method can achieve the enrichment of Ti-containing components in titanium-containing blast furnace slag, increasing the titanium carbide content in the carbide slag by 15%-40%, significantly reducing the yield of titanium extraction tailings, effectively reducing tailings treatment costs, and can be applied to other slag smelting industries. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the method for treating titanium-containing blast furnace slag according to the present invention; Figure 2 This is a flowchart of the pretreatment process for titanium-containing blast furnace slag according to the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0021] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0022] In view of the above objectives, one aspect of the embodiments of the present invention is as follows: Figure 1 As shown, a method for processing titanium-containing blast furnace slag is proposed. The titanium-containing blast furnace slag can be a high-titanium type blast furnace slag. The titanium dioxide (TiO2) content in the titanium-containing blast furnace slag is usually between 20wt% and 35wt%. For titanium-containing blast furnace slag produced from certain specific mineral sources or processes, the TiO2 content can be further increased to about 40wt%.

[0023] The above method includes the following steps: S101. Pre-treat titanium-containing blast furnace slag to remove ineffective components from the titanium-containing blast furnace slag; S102. After the pretreated titanium-containing blast furnace slag is subjected to a high-temperature carbonization process, a high-TiC content carbonized slag is obtained.

[0024] Among them, the TiC content in the high TiC content carbide slag is 25wt%-60wt%.

[0025] By combining pretreatment to remove ineffective components with high-temperature carbonization, the TiC content in the carbide slag can be directly increased to 25wt%-60wt%, which is 1.5-4 times higher than the existing process (10%-15%), thus fundamentally solving the problem of "low titanium content in finished carbide slag". When the high TiC content carbide slag is used for subsequent low-temperature chlorination, it can reduce the chlorination reaction of impurities in the carbide slag, laying the foundation for "efficient recovery of titanium resources".

[0026] Before pretreatment of titanium-containing blast furnace slag, the lumpy titanium-containing blast furnace slag is crushed to less than 2cm.

[0027] In a preferred embodiment of the present invention, such as Figure 2 As shown, the preprocessing process includes: S201. Add titanium-containing blast furnace slag to an organic acid solution, heat and stir, then filter to obtain filter residue; S202. Add the filter residue to the alkaline solution, heat and stir, and then filter to obtain the pretreated titanium-containing blast furnace slag.

[0028] A two-step pretreatment process of "organic acid dissolution + alkali dissolution" is adopted to achieve "targeted removal" of ineffective components in titanium-containing blast furnace slag. Organic acid can preferentially dissolve alkaline metal oxides such as calcium and magnesium in the slag, while alkali solution can further dissolve acidic oxides such as SiO2, avoiding the ineffective components from reacting with carbon and consuming reducing agents or generating by-products during high-temperature carbonization. The proportion of titanium-containing components is increased after pretreatment, providing a "high-purity raw material basis" for the subsequent high-temperature carbonization to generate high-content TiC, and avoiding the dilution of TiC concentration by ineffective components.

[0029] In a preferred embodiment of the present invention, the organic acid solution is one or more mixed acids selected from oxalic acid, citric acid, formic acid, and acetic acid, and the concentration of the organic acid solution is 15wt%-40wt%.

[0030] The concentration of the organic acid solution can be, for example, 15, 20, 25, 30, 35, 40% by mass or any range between any two values, preferably 20-30% by mass.

[0031] The organic acid solution is limited to moderately strong acids such as oxalic acid and citric acid, with a concentration (15wt%-40wt%) to ensure the dissolution efficiency of calcium and magnesium oxides. Concentrations exceeding 40wt% will lead to acid waste and equipment corrosion; concentrations below 15wt% will result in incomplete dissolution and insufficient TiC content in subsequent carbonization. The selected organic acids are all easily degradable and low-polluting, making subsequent wastewater treatment easier. Compared to inorganic strong acids (such as hydrochloric acid and sulfuric acid), they better meet environmental protection requirements and reduce the environmental risk of the process.

[0032] In a preferred embodiment of the present invention, the solid-liquid ratio of titanium-containing blast furnace slag to organic acid solution in step S201 is 20g / L-40g / L.

[0033] The solid-liquid ratio of titanium-containing blast furnace slag to organic acid solution can be, for example, 20 g / L, 25 g / L, 30 g / L, 35 g / L, 40 g / L, or any range between any two values, preferably 20-30 g / L.

[0034] A solid-liquid ratio (20g / L-40g / L) achieves a balance between "full dispersion of slag and efficient utilization of acid". A solid-liquid ratio below 20g / L will result in excessive acid and increased costs. A solid-liquid ratio above 40g / L will result in slag agglomeration, insufficient contact between calcium and magnesium oxides and acid, and decreased solubility.

[0035] In a preferred embodiment of the present invention, in step S201, the heating temperature is 50℃-100℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min; the heating temperature can be, for example, 50, 60, 70, 80, 90, 100℃ and any range between any two values, preferably 80-100℃; the stirring time can be, for example, 2, 3, 4, 5h and any range between any two values, preferably 3-5h; the stirring speed can be, for example, 200, 300, 400, 500r / min and any range between any two values, preferably 300-500r / min.

[0036] Heating temperature (50℃-100℃) can promote the ionization of organic acids, enhance reaction activity, and avoid slow reaction due to excessively low temperature; stirring time (2h-5h) and stirring speed (200r / min-500r / min) ensure that the residue and acid are fully mixed, with no local reaction dead zones, and that calcium and magnesium oxides are dissolved evenly.

[0037] In a preferred embodiment of the present invention, the alkaline solution is selected from NaOH solution or Na2CO3 solution; wherein the concentration of NaOH solution is 10wt%-30wt% and the concentration of Na2CO3 solution is 20wt%-40wt%.

[0038] The concentration of the NaOH solution can be, for example, 10, 20, 30 wt% or any range between any two values, preferably 20-30 wt%.

[0039] The concentration of the Na2CO3 solution can be, for example, 20, 30, 40 wt% or any range between any two values, preferably 30-40 wt%.

[0040] Using NaOH or Na2CO3 solutions as alkaline solutions, the concentration can be specifically used to dissolve SiO2 to generate sodium silicate. Alkaline solutions have high stability and no volatile pollution, and are less expensive than strong alkalis (such as KOH). The sodium silicate generated is easily soluble in water and can be completely separated from titanium-containing slag after filtration.

[0041] In a preferred embodiment of the present invention, the solid-liquid ratio of the filter residue to the alkaline solution in step S202 is 80 g / L-100 g / L.

[0042] In a preferred embodiment of the present invention, in step S202, the heating temperature is 80℃-120℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min; the heating temperature can be, for example, any range of 80, 85, 90, 95, 100, 105, 110, 105, 120℃ and any two of these values, preferably 100-120℃; the stirring time can be, for example, 2, 3, 4, 5h and any two of these values, preferably 3-5h; the stirring speed can be, for example, 200, 300, 400, 500r / min and any two of these values, preferably 300-500r / min.

[0043] Heating temperature (80℃-120℃) can accelerate the reaction of silicon oxide with alkali (e.g., the rate of reaction between SiO2 and NaOH to produce sodium silicate is increased by 2-3 times). Stirring time (2h-5h) and stirring speed (200r / min-500r / min) can prevent filter residue from agglomerating and ensure that silicon and aluminum are completely dissolved.

[0044] In a preferred embodiment of the present invention, the high-temperature carbonization process includes: The pretreated titanium-containing blast furnace slag is mixed with a carbon-containing reducing agent and smelted at 1500℃-1600℃. After slag removal, the slag is water-quenched, dried and ground to obtain carbide slag with high TiC content.

[0045] The amount of carbon-containing reducing agent added is 10%-15% of the mass of the pretreated titanium-containing blast furnace slag, and the smelting time is 1.5h-3h.

[0046] The amount of carbon-containing reducing agent added is a fraction of the mass of the pretreated titanium-containing blast furnace slag, for example, 10, 11, 12, 13, 14, 15% or any range between any two values, preferably 13-15% by mass.

[0047] The melting time can be, for example, 1.5, 2, 2.5, 3 hours or any range between any two values, preferably 2-3 hours.

[0048] This invention discloses a method for treating titanium-containing blast furnace slag. By pre-treating the titanium-containing blast furnace slag to remove ineffective components, i.e., impurities, it achieves the enrichment of Ti-containing components. The pre-treated titanium-containing blast furnace slag is then processed through a high-temperature carbonization process to produce high-TiC content carbide slag, which is used in the subsequent low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, etc. Compared with existing technologies, this method can achieve the enrichment of Ti-containing components in titanium-containing blast furnace slag, increasing the titanium carbide content in the carbide slag by 15%-40%, significantly reducing the yield of titanium extraction tailings, effectively reducing tailings treatment costs, and can be applied to other slag smelting industries.

[0049] The present invention will be further illustrated by the following examples.

[0050] Example 1 Titanium-containing blast furnace slag from a certain factory (its chemical composition is shown in Table 1) was selected and crushed to less than 2 cm. The small pieces of titanium-containing blast furnace slag were added to a 30% oxalic acid solution at a solid-liquid ratio of 30 g / L and leached at 80℃ and 300 r / min for 3 h. Then, the residue A and the filtrate were obtained by filtration.

[0051] Filter residue A was added to a 20% NaOH solution at a solid-liquid ratio of 80 g / L, and leached for 3 hours at 100°C and 300 r / min. Filter residue B was then obtained by filtration.

[0052] After washing filter residue B with distilled or deionized water, it is dried to obtain filter residue C. 50t of filter residue C is loaded into a three-phase AC electric furnace, 6.5t of coke powder is added, and it is smelted at 1500℃-1600℃ for 2 hours. After slag discharge, the slag discharge process involves water quenching, drying and grinding to obtain the finished carbide slag (its chemical composition is shown in Table 2). The TiC content in the carbide slag is increased by 25% compared with the existing technology, and it is used in the next low-temperature chlorination process to produce refined TiCl4, titanium dioxide or sponge titanium, etc.

[0053] Therefore, by pretreating titanium-containing blast furnace slag with organic acid and alkaline solutions, impurities are removed and Ti-containing components are enriched. The pretreated titanium-containing blast furnace slag is then subjected to a high-temperature carbonization process to produce high-TiC content carbide slag, increasing the titanium carbide content by 25% compared to existing technologies. This carbide slag is then used in the subsequent low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, reducing the yield of titanium extraction tailings by approximately 25%-30% and effectively lowering tailings treatment costs.

[0054] Table 1. Main chemical composition of titanium-containing blast furnace slag / %

[0055] Table 2 Main Chemical Components of Finished Carbonized Slag (%)

[0056] Example 2 Titanium-containing blast furnace slag from a certain factory (its chemical composition is shown in Table 1) was selected and crushed to less than 2 cm. The small pieces of titanium-containing blast furnace slag were added to a 15% citric acid solution at a solid-liquid ratio of 20 g / L and leached at 100℃ and 200 r / min for 2 h. Then, the residue A and the filtrate were obtained by filtration.

[0057] Filter residue A was added to a 30% Na2CO3 solution at a solid-liquid ratio of 85 g / L, and leached for 2 hours at 120℃ and 200 r / min. Filter residue B was then obtained by filtration.

[0058] After washing filter residue B with distilled or deionized water, it is dried to obtain filter residue C. 50t of filter residue C is loaded into a three-phase AC electric furnace, 5t of coke powder is added, and it is smelted at 1500℃-1600℃ for 1.5h before slag discharge. During the slag discharge process, the residue is water quenched, dried and ground to obtain the finished carbide slag (its chemical composition is shown in Table 3). The TiC content in the carbide slag is increased by about 25% compared with the existing technology, and it is used in the next low-temperature chlorination process to produce refined TiCl4, titanium dioxide or sponge titanium, etc.

[0059] Therefore, by pretreating titanium-containing blast furnace slag with organic acid and alkaline solutions, impurities are removed and Ti-containing components are enriched. The pretreated titanium-containing blast furnace slag is then subjected to a high-temperature carbonization process to produce high-TiC content carbide slag, increasing the titanium carbide content by approximately 25% compared to existing technologies. This carbide slag is then used in the subsequent low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, reducing the yield of titanium extraction tailings by approximately 25%-30% and effectively lowering tailings treatment costs.

[0060] Table 3 Main Chemical Components of Finished Carbonized Slag (%)

[0061] Example 3 Titanium-containing blast furnace slag from a certain factory (its chemical composition is shown in Table 1) was selected and crushed to less than 2 cm. The small pieces of titanium-containing blast furnace slag were added to 40% formic acid at a solid-liquid ratio of 40 g / L and leached for 5 h at 50 °C and 500 r / min. Then, the residue A and filtrate were obtained by filtration.

[0062] Filter residue A was added to a 20% NaOH solution at a solid-liquid ratio of 90 g / L, and leached for 5 h at 80 °C and 500 r / min. Filter residue B was then obtained by filtration.

[0063] After washing filter residue B with distilled or deionized water, it is dried to obtain filter residue C. 50t of filter residue C is loaded into a three-phase AC electric furnace, and 7.5t of coke powder is added. After melting at 1500℃-1600℃ for 3 hours, the slag is discharged. During the slag discharge process, the residue is water-quenched, dried, and ground to obtain the finished carbide slag (its chemical composition is shown in Table 4). The TiC content in the carbide slag is increased by about 26% compared with the existing technology. It is used in the next low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, etc.

[0064] Therefore, by pretreating titanium-containing blast furnace slag with organic acid and alkaline solutions, impurities are removed and Ti-containing components are enriched. The pretreated titanium-containing blast furnace slag is then subjected to a high-temperature carbonization process to produce high-TiC content carbide slag, increasing the titanium carbide content by approximately 26% compared to existing technologies. This carbide slag is then used in the subsequent low-temperature chlorination process to produce refined TiCl4, titanium dioxide, or sponge titanium, reducing the yield of titanium extraction tailings by approximately 26%-32% and effectively lowering tailings treatment costs.

[0065] Table 4. Main chemical components of finished carbonized slag (%)

[0066] Comparative Example 1 Titanium-containing blast furnace slag from a certain factory (its chemical composition is shown in Table 1) was selected and crushed to less than 2 cm.

[0067] 50 tons of crushed titanium-containing blast furnace slag were directly loaded into a three-phase AC electric furnace, along with 6.5 tons of coke powder. The furnace was smelted at 1500℃-1600℃ for 2 hours before slag removal. The slag was then water-quenched, dried, and ground to obtain the finished carbide slag (its chemical composition is shown in Table 5). The titanium carbide content was 14.81%. This carbide slag was used in a low-temperature chlorination process to produce titanium dioxide. Approximately 6.3 tons of titanium tailings were produced for every ton of titanium dioxide produced.

[0068] Table 5. Main chemical components of finished carbonized slag / %

[0069] Comparative Example 2 Titanium-containing blast furnace slag from a certain factory (its chemical composition is shown in Table 1) was selected and crushed to less than 2 cm. The difference from Example 1 is that 50 t of filter residue C was loaded into a three-phase AC electric furnace, 5.5 t of coke powder was added, and it was smelted at 1500℃-1600℃ for 1.5 h. The rest was the same as in Example 1.

[0070] The resulting carbide slag (its chemical composition is shown in Table 6) was obtained. The titanium carbide content was 34.45%.

[0071] Table 6. Main chemical components of finished carbonized slag / %

[0072] Comparative Example 1 did not employ an acid-base pretreatment step, but the high-temperature treatment step was consistent with Example 1, indicating that its TiC content was significantly lower than that of Example 1. Comparative Example 2 retained the same acid-base pretreatment step as Example 1, but the subsequent high-temperature treatment step differed, showing that its TiC content was slightly lower than that of Example 1. Therefore, the acid-base pretreatment step and the high-temperature treatment step in Examples 1-3 can all optimize and improve the TiC content.

[0073] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. Although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method of treating a titanium-containing blast furnace slag, characterized by, The method comprises the following steps: S101, pretreating the titanium-containing blast furnace slag to remove invalid components in the titanium-containing blast furnace slag; S102, obtaining carbonized slag with high TiC content after high-temperature carbonization process treatment of the pretreated titanium-containing blast furnace slag; The TiC content in the carbonized slag with high TiC content is 25wt%-60wt%.

2. The method of processing titanium-containing blast furnace slag according to claim 1, characterized in that, In S101, the pretreatment process comprises: S201, adding the titanium-containing blast furnace slag into an organic acid solution, and obtaining filter residue after heating and stirring; S202, adding the filter residue into an alkali solution, and obtaining the pretreated titanium-containing blast furnace slag after heating and stirring.

3. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, The organic acid solution is a mixed acid selected from one or more of oxalic acid, citric acid, formic acid and acetic acid, and the concentration of the organic acid solution is 15wt%-40wt%.

4. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, The solid-liquid ratio of the titanium-containing blast furnace slag to the organic acid solution in S201 is 20g / L-40g / L.

5. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, In S201, the heating temperature is 50℃-100℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min.

6. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, The alkali solution is selected from NaOH solution or Na2CO3 solution; wherein the concentration of the NaOH solution is 10wt%-30wt%, and the concentration of the Na2CO3 solution is 20wt%-40wt%.

7. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, The solid-liquid ratio of the filter residue to the alkali solution in S202 is 80g / L-100g / L.

8. The method of processing titanium-containing blast furnace slag according to claim 2, characterized in that, In S202, the heating temperature is 80℃-120℃, the stirring time is 2h-5h, and the stirring speed is 200r / min-500r / min.

9. The method of processing titanium-containing blast furnace slag according to claim 1, characterized in that, The high-temperature carbonization process comprises: Mixing the pretreated titanium-containing blast furnace slag with a carbon-containing reducing agent, and obtaining the carbonized slag with high TiC content after smelting at 1500℃-1600℃ and then starting slagging, and then water quenching, drying and grinding.

10. The method of processing titanium-containing blast furnace slag according to claim 9, characterized in that, The addition amount of the carbon-containing reducing agent is 10%-15% of the mass of the pretreated titanium-containing blast furnace slag, and the smelting time is 1.5h-3h.

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