Method for controlling titanium carbide content with iron oxide powder

Abstract

This disclosure relates to the field of titanium extraction technology from blast furnace slag, and particularly to a method for controlling the titanium carbide content using iron oxide powder, comprising the following steps: Step 1, when the slag generated by the carbon-blending of titanium-containing blast furnace slag reaches the smelting endpoint, a sample is taken to detect the mass percentage of titanium carbide in the slag; Step 2, when the mass percentage exceeds a set threshold, iron oxide powder is added to the slag to control the mass percentage within a reference range. This disclosure solves the problem of easy bending of titanium slabs with large aspect ratios during the upsetting process. This disclosure also solves the problem of high TiC content in existing titanium-containing blast furnace slag carbon-blending processes. By adding iron oxide powder to react with excess TiC in a directional manner, the TiC content can be stably controlled within a reference range, effectively reducing slag viscosity, ensuring smooth slag discharge, and avoiding safety hazards such as equipment blockage; at the same time, it improves the temperature control effect of the subsequent boiling chlorination reaction, and improves the efficiency and quality of subsequent titanium resource recovery.

Description

Technical Field

[0001] This disclosure relates to the field of titanium extraction technology from blast furnace slag, and in particular to a method for controlling the titanium carbide content in iron oxide powder. Background Technology

[0002] Titanium resources are an important strategic resource for my country. Titanium-containing blast furnace slag, a major byproduct of steelmaking, contains a certain amount of titanium dioxide (TiO2) and serves as an important carrier for titanium resource recovery. Currently, Panzhihua Iron and Steel Group (Pangang) employs a three-phase AC closed electric furnace with carbon smelting to reduce titanium-containing blast furnace slag. Through the chemical reaction TiO2 + C → TiC + CO, the titanium dioxide in the blast furnace slag is converted into titanium carbide (TiC), thereby achieving the recovery and utilization of titanium resources and effectively improving the comprehensive utilization rate of titanium resources.

[0003] However, in actual industrial applications, the aforementioned carbon-blended smelting process suffers from inconsistencies in the determination of the smelting endpoint, leading to unstable control of the titanium carbide content in the slag. This often results in TiC content exceeding the baseline control value. Excessive titanium carbide content significantly increases slag viscosity, drastically increasing the difficulty of slag removal. This not only affects production efficiency but may also cause safety hazards such as blockage at the electric furnace slag outlet. Furthermore, excessively high TiC content interferes with the temperature control of the subsequent fluidized bed chlorination reaction, severely hindering the optimization, upgrading, and industrialization of titanium extraction processes from titanium-containing blast furnace slag.

[0004] Based on the above, the existing technology needs further improvement. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this disclosure provides a method for controlling the titanium carbide content with iron oxide powder, including the following steps: Step 1, when the titanium-containing blast furnace slag is smelted with carbon to generate slag and enters the smelting endpoint, a sample is taken to detect the mass ratio of titanium carbide in the slag; Step 2, when the mass ratio exceeds a set threshold, iron oxide powder is added to the slag to control the mass ratio within the range of the benchmark value.

[0006] In some embodiments, the threshold is 14.5%-16.5%.

[0007] In some embodiments, the baseline value is 8%-13.5%.

[0008] In some embodiments, the amount of iron oxide powder added is: M=[(WN%) M 总 160] / (59+160 N%) Where M is the amount of iron oxide powder added, in kilograms; W is the mass percentage of titanium carbide obtained from sampling and testing; N% is the baseline value; and M...总 The total mass of the slag is expressed in kilograms.

[0009] In some embodiments, the iron oxide powder is derived from industrial by-products.

[0010] In some embodiments, the particle size distribution of the iron oxide powder is ≤250 mesh.

[0011] In some embodiments, when iron oxide powder is added in step 2, the temperature of the slag is ≥1300℃.

[0012] In some embodiments, in step 1, the reaction of titanium-containing blast furnace slag with carbon to generate slag is carried out in a three-phase AC closed electric furnace.

[0013] In some embodiments, in step 1, the sampling and detection are performed using X-ray fluorescence spectroscopy or laser-induced breakdown spectroscopy.

[0014] In some embodiments, in step 2, iron oxide powder is added to the slag and then stirred.

[0015] By adopting the above technical solution, this disclosure has at least the following beneficial effects: 1. This invention solves the problem of high TiC content in existing titanium-containing blast furnace slag carbon smelting processes. By adding iron oxide powder to react with excess TiC in a directional manner, the TiC content can be stably controlled within the benchmark range, effectively reducing slag viscosity, ensuring smooth slag discharge, and avoiding safety hazards such as equipment blockage. At the same time, it improves the temperature control effect of the subsequent boiling chlorination reaction, thereby improving the efficiency and quality of subsequent titanium resource recovery.

[0016] 2. The process is simple and easy to operate. It does not require large-scale modification of existing carbon smelting equipment such as three-phase AC closed electric furnaces. Only the sampling and testing, iron oxide powder addition and stirring steps need to be added at the end of smelting to achieve precise control of TiC content. It is easy to promote and apply industrially and is compatible with existing production processes.

[0017] 3. Iron oxide powder is an industrial by-product, which is inexpensive and widely available. This reduces process costs and realizes the resource utilization of industrial waste, which is in line with the concept of green and environmentally friendly production. At the same time, the metallic iron produced by the reaction can be collected and recycled in a unified manner, further improving the comprehensive utilization rate of resources.

[0018] 4. The precise calculation formula for the amount of iron oxide powder added and the strict control of the particle size of iron oxide powder ensure sufficient reaction and precise regulation. The amount added can be flexibly adjusted according to the degree of TiC exceeding the standard, which is highly adaptable and can meet the regulation needs under different working conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure 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 this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for controlling the titanium carbide content using iron oxide powder according to an embodiment of the present disclosure. Detailed Implementation

[0021] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0022] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0023] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0025] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0026] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0028] As mentioned in the background section, in practical industrial applications, the titanium carbide content in the slag cannot be stably controlled due to deviations in the determination of the smelting endpoint. Often, the TiC content exceeds the baseline control value. Excessive titanium carbide content significantly increases slag viscosity, leading to a substantial increase in slag removal difficulty. This not only affects production efficiency but may also cause safety hazards such as blockage at the electric furnace slag outlet. Furthermore, excessively high TiC content interferes with the temperature control of the subsequent fluidized bed chlorination reaction, severely hindering the optimization, upgrading, and industrialization of the titanium extraction process from titanium-containing blast furnace slag. Therefore, this disclosure provides a method for controlling titanium carbide content using iron oxide powder, solving the problems of excessively high and difficult-to-control titanium carbide content at the smelting endpoint in existing technologies, resulting in viscous slag, difficult slag removal, and difficulty in controlling the temperature of the subsequent fluidized bed chlorination reaction.

[0029] This disclosure provides several embodiments of a method for controlling the titanium carbide content using iron oxide powder, such as... Figure 1 As shown, the process includes the following steps: Step 1: When the titanium-containing blast furnace slag is smelted with carbon to generate slag and enters the smelting endpoint, a sample is taken to detect the mass ratio of titanium carbide in the slag; Step 2: When the mass ratio exceeds the set threshold, iron oxide powder is added to the slag to control the mass ratio within the range of the benchmark value.

[0030] Compared with existing technologies, this disclosure proposes a method for controlling the titanium carbide content using iron oxide powder, which solves the problem of high TiC content in existing titanium-containing blast furnace slag carbon smelting processes. By adding iron oxide powder to react with excess TiC in a directional manner, the TiC content can be stably controlled within the benchmark range, effectively reducing slag viscosity, ensuring smooth slag discharge, and avoiding safety hazards such as equipment blockage. At the same time, it improves the temperature control effect of the subsequent boiling chlorination reaction, thereby improving the efficiency and quality of subsequent titanium resource recovery.

[0031] In the above method, the threshold is 14.5%-16.5%, preferably 15.5%.

[0032] In the above method, the baseline value is 8%-13.5%.

[0033] In the above method, the amount of iron oxide powder added is: M=[(WN%) M 总 160] / (59+160 N%) Where M is the amount of iron oxide powder added, in kilograms; W is the mass percentage of titanium carbide obtained from sampling and testing; N% is the baseline value; and M... 总 The total mass of the slag is expressed in kilograms.

[0034] In the above method, the iron oxide powder is derived from industrial by-products. Using industrial by-products is inexpensive, widely available, and requires no complex purification to meet reaction needs. This reduces process costs while achieving resource utilization of industrial waste, aligning with green and environmentally friendly principles.

[0035] In the above method, the particle size distribution of iron oxide powder is ≤250 mesh. By controlling the particle size, the specific surface area of ​​iron oxide powder is increased, improving the contact sufficiency with TiC in the molten slag, accelerating the reaction rate, ensuring complete reaction, and guaranteeing stable TiC content control.

[0036] In the above method, when iron oxide powder is added in step 2, the temperature of the slag is ≥1300℃.

[0037] In the above method, in step 1, the reaction of slag formation by carbon smelting of titanium-containing blast furnace slag is carried out in a three-phase AC closed electric furnace.

[0038] In the above method, in step 1, the sampling and detection are performed using X-ray fluorescence spectroscopy or laser-induced breakdown spectroscopy.

[0039] In the above method, in step 2, iron oxide powder is added to the slag and then stirred.

[0040] The technical solution of the present invention will be further described below through specific embodiments.

[0041] Example 1: Step 1: The titanium-containing blast furnace slag is fed into a three-phase AC closed electric furnace for carbon smelting. When the reaction reaches the smelting endpoint, X-ray fluorescence spectroscopy is used to sample and detect the mass ratio of titanium carbide in the slag. The detected mass ratio of TiC in the slag is W=16.3%, which exceeds the threshold (15.5%) and needs to be adjusted.

[0042] Step 2: Set the baseline value N% = 13.5%, and the total mass of molten slag M is known. 总 =1000kg, according to the formula for calculating the amount of iron oxide powder added, M=[(WN%) M 总 160] / (59+160 Based on N%), the amount of iron oxide powder added is calculated as follows: M = [(16.3% - 13.5%)] 1000 160] / (59+160 13.5%) = 55.58 kg.

[0043] Select iron oxide powder with a particle size distribution of 200 mesh (≤250 mesh). At this time, the slag temperature is 1320℃. Add the calculated amount of iron oxide powder evenly to the slag. After adding, stir the slag for 8 minutes to ensure that the iron oxide powder and the slag are fully in contact and react.

[0044] After the reaction was completed, X-ray fluorescence spectroscopy was used to sample and detect the TiC content in the slag. The results showed that the TiC content was 13.2%, which was within the baseline range of 8%-13.5%, indicating that the control was complete.

[0045] In this embodiment, the viscosity of the molten slag was significantly reduced after adjustment, resulting in smooth slag discharge without equipment blockage, and the temperature of the subsequent boiling chlorination reaction was stabilized. The reaction formula between TiC and iron oxide powder is: TiC + Fe2O3 = 2Fe + TiO2 + CO↑. The metallic iron produced by the reaction settles at the bottom of the electric furnace and is collected and recycled after smelting, realizing the secondary utilization of resources.

[0046] Example 2: Step 1: The titanium-containing blast furnace slag is fed into a three-phase AC closed electric furnace for carbon smelting. When the reaction reaches the smelting endpoint, the mass ratio of titanium carbide in the slag is sampled and detected by laser-induced breakdown spectroscopy. The detected mass ratio of TiC in the slag is W=15.8%, which exceeds the threshold of 15.5% and needs to be adjusted.

[0047] Step 2: Set the baseline value N% = 10.0%, and the total mass of molten slag M is known.总 =1500kg, calculated according to the formula M=[(WN%) for the amount of iron oxide powder added. M 总 160] / (59+160 Based on N%), the amount of iron oxide powder added is calculated as follows: M=[(15.8%-10%) 1500 160] / (59+160 10%) = 185.6 kg.

[0048] Select iron oxide powder with a particle size distribution of 250 mesh (≤250 mesh). At this time, the temperature of the molten slag is 1350℃. Add the calculated amount of iron oxide powder evenly to the molten slag. After adding, stir the molten slag to ensure that the iron oxide powder and the molten slag are fully in contact and react.

[0049] After the reaction was completed, laser-induced breakdown spectroscopy was used again to sample and detect the TiC content in the slag. The results showed that the TiC content was 9.8%, which is within the baseline range of 8%-13.5%, indicating that the control was completed.

[0050] In this embodiment, the slag has good fluidity after regulation, and the subsequent boiling chlorination reaction temperature is stable. The reaction formula between TiC and iron oxide powder is: TiC + Fe2O3 = 2Fe + TiO2 + CO↑. The metallic iron produced by the reaction settles at the bottom of the electric furnace and is collected and recovered after smelting, which further improves the comprehensive utilization rate of resources.

[0051] Example 3: Step 1: The titanium-containing blast furnace slag is fed into a three-phase AC closed electric furnace for carbon smelting. When the reaction reaches the smelting endpoint, the mass ratio of titanium carbide in the slag is sampled and detected by laser-induced breakdown spectroscopy. The mass ratio of TiC in the slag is detected to be W=15.9%, which exceeds the threshold of 15.5% and needs to be adjusted.

[0052] Step 2: Set the baseline value N% = 8%, and the total mass of molten slag M is known. 总 =800kg, calculated according to the formula M=[(WN%) for the amount of iron oxide powder added. M 总 160] / (59+160 Based on N%), the amount of iron oxide powder added is calculated as follows: M=[(15.9%-8%) 800 160] / (59+160 8%) = 140.84 kg.

[0053] Step 3: Select iron oxide powder with a particle size distribution of 250 mesh (≤250 mesh). At this time, the temperature of the slag is 1340℃. Add the calculated amount of iron oxide powder evenly to the slag. After adding, stir the slag to ensure that the iron oxide powder and the slag are in full contact and react.

[0054] After the reaction was completed, laser-induced breakdown spectroscopy was used again to sample and test the slag. The result showed that the mass percentage of TiC in the slag was 9.1%, which is within the baseline range of 8%-13.5%. The reaction formula between TiC and iron oxide powder is: TiC + Fe2O3 = 2Fe + TiO2 + CO↑. The metallic iron produced by the reaction settles at the bottom of the electric furnace and is collected and recovered after smelting, which further improves the comprehensive utilization rate of resources.

[0055] In this embodiment, the slag has good fluidity after regulation, the subsequent boiling chlorination reaction temperature is stable, the titanium resource recovery quality meets the standards, and the metallic iron produced by the reaction settles at the bottom of the electric furnace and is collected and recycled after smelting, realizing the dual high-efficiency utilization of industrial waste and titanium resources.

[0056] Example 4: Step 1: The titanium-containing blast furnace slag is fed into a three-phase AC closed electric furnace for carbon smelting. When the reaction reaches the smelting endpoint, X-ray fluorescence spectroscopy is used to sample and detect the mass ratio of titanium carbide in the slag. The detected mass ratio of TiC in the slag is W=17.5%, which exceeds the threshold of 15.5% and needs to be adjusted.

[0057] Step 2: Determine the control baseline value N% = 13.5%. Given that the total mass of molten slag M_total = 900 kg, calculate the amount of iron oxide powder added using the formula M = [(WN%)]. M 总 160] / (59+160 Based on N%), the amount of iron oxide powder added is calculated as follows: M = [(17.5% - 13.5%)] 900 160] / (59+160 13.5%) = 71.5 kg.

[0058] Step 3: Select iron oxide powder with a particle size distribution of 230 mesh (≤250 mesh). At this time, the temperature of the slag is 1325℃. Add the calculated amount of iron oxide powder evenly to the slag. After adding, stir the slag to ensure that the iron oxide powder and the slag are fully in contact and react.

[0059] After the reaction was completed, X-ray fluorescence spectroscopy was used to sample and detect the TiC content in the slag. The results showed that the TiC content was 13.4%, which was within the baseline range of 8%-13.5%, indicating that the control was complete.

[0060] In this embodiment, the viscosity of the molten slag is significantly reduced after regulation, the slag discharge is smooth, and there is no risk of equipment blockage. The reaction formula between TiC and iron oxide powder is: TiC + Fe2O3 = 2Fe + TiO2 + CO↑. The metallic iron produced by the reaction settles at the bottom of the electric furnace and is collected and recycled after smelting, which further improves the comprehensive utilization rate of resources.

[0061] The above embodiments all demonstrate that the method for controlling titanium carbide content using iron oxide powder of the present invention can accurately regulate the TiC content at the endpoint of carbon-blended blast furnace slag containing titanium, solving the problem of excessive TiC content in existing technologies. The process is simple, low-cost, and provides stable control effects, adapting to existing industrial production processes and showing promising prospects for industrial application. Through a precise calculation formula for the amount of iron oxide powder added and strict control of the iron oxide powder particle size, the reaction is ensured to be complete and the control precise. The amount added can be flexibly adjusted according to the degree of TiC exceeding the standard, exhibiting strong adaptability and meeting the control requirements under different operating conditions.

[0062] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0063] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A method for controlling the titanium carbide content of iron oxide powder, characterized by, Includes the following steps: Step 1: When the titanium-containing blast furnace slag is smelted with carbon to generate slag and enters the smelting endpoint, a sample is taken to detect the mass percentage of titanium carbide in the slag. Step 2: When the mass ratio exceeds the set threshold, iron oxide powder is added to the slag to control the mass ratio within the range of the benchmark value.

2. The method of controlling titanium carbide content of iron oxide fines according to claim 1, wherein, The threshold is 14.5%-16.5%.

3. The method of controlling titanium carbide content of iron oxide fines according to claim 2, wherein, The benchmark value is 8%-13.5%.

4. The method of controlling titanium carbide content of iron oxide fines according to claim 3, wherein The amount of iron oxide powder added is: M=[(W-N%) M 总 160] / (59+160 N%) Wherein, M is the added amount of iron oxide powder, unit is kilogram, W is the mass ratio of titanium carbide obtained by sampling detection, N% is the reference value, M 总 is the total mass of molten slag, unit is kilogram.

5. The method for controlling titanium carbide content with iron oxide powder according to claim 1, characterized in that, The iron oxide powder is derived from industrial byproducts.

6. The method for controlling titanium carbide content with iron oxide powder according to claim 5, characterized in that, The particle size distribution of the iron oxide powder is ≤250 mesh.

7. The method for controlling titanium carbide content with iron oxide powder according to claim 1, characterized in that, In step 2, when the iron oxide powder is added, the temperature of the slag is ≥1300℃.

8. The method for controlling titanium carbide content with iron oxide powder according to claim 1, characterized in that, In step 1, the reaction of slag formation by carbon smelting of titanium-containing blast furnace slag is carried out in a three-phase AC closed electric furnace.

9. The method for controlling titanium carbide content with iron oxide powder according to claim 1, characterized in that, In step 1, the sampling and detection are performed using X-ray fluorescence spectroscopy or laser-induced breakdown spectroscopy.

10. The method for controlling titanium carbide content with iron oxide powder according to claim 1, characterized in that, In step 2, iron oxide powder is added to the slag and then stirred.

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