Cyclic treatment method for fine-fraction titanium-rich material by utilizing electric furnace to smelt high-titanium slag

Abstract

The invention relates to the technical field of electric furnace smelting, in particular to a circular treatment method for a fine-fraction titanium-rich material through electric furnace smelting of high titanium slag. The method comprises the following steps: filling a fine-fraction titanium-rich material, titanium concentrate and a reducing agent into a stock bin at the top of an electric arc furnace, proportionally blanking and smelting, carrying out electric arc melting and stirring, treating slag liquid to obtain a high-titanium slag product, and circularly smelting the generated fine-fraction titanium-rich material. An alternating-current electric arc furnace is adopted for closed and open arc smelting, a furnace top stock bin is used for regulating and controlling feeding point positions and speed, and precise smelting is achieved in combination with multiple feeding point position layouts. According to the method, the titanium element in the fine-fraction titanium-rich material is effectively utilized, introduction of impurities is avoided, the titanium grade of the slag liquid meets the process requirement by adjusting the dosage of the reducing agent, recycling of the fine-fraction titanium-rich material is achieved, resource waste and environmental pollution are reduced, the smelting efficiency and product quality are improved, and the smelting process is optimized.

Description

Technical Field

[0001] This invention relates to the field of electric furnace smelting technology, specifically a method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting. Background Technology

[0002] High-titanium slag, as a raw material for the titanium dioxide chlorination process, is mostly obtained through slag crushing and beneficiation. Generally, a grade of over 90% is required, with over 90% of the particles being in the 0.085mm-0.074mm range. During the crushing and beneficiation process for producing high-titanium slag, a certain amount of fine-grained titanium-rich material is generated, comprising 15% of the particles in the 0.085mm-0.074mm range and 85% of the particles smaller than 0.074mm. This fine-grained titanium-rich material has a titanium grade of over 88%. However, because its grade and particle size do not meet the raw material particle size requirements of the existing titanium dioxide chlorination process, it cannot be used, resulting in a waste of titanium. The traditional method of recycling this fine-grained titanium-rich material for smelting has significant drawbacks. On the one hand, the remelting process greatly increases electricity consumption, leading to a significant increase in production costs; on the other hand, even if the material is remelted, it is difficult to effectively solve the fundamental problem of the substandard particle size and grade of fine-grained titanium-rich material, which cannot meet the high-quality requirements of the titanium dioxide chlorination process for raw materials, resulting in poor overall processing effect. Summary of the Invention

[0003] The present invention aims to solve the above problems and thus provide a method for recycling fine-grained titanium-rich materials using high-titanium slag smelted in an electric furnace.

[0004] The technical solution adopted by the present invention to solve the aforementioned problem is as follows: A method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting, comprising the following steps: Step 1: The fine-grained titanium-rich material is loaded into the top hopper of the electric arc furnace top charging system used for smelting high-titanium slag, in preparation for subsequent smelting. Step 2: Load the titanium concentrate and reducing agent into the furnace top silo to complete the initial storage of furnace charge; Step 3: According to a certain ratio, fine-grained titanium-rich material, titanium concentrate, and reducing agent are fed into the electric arc furnace through the furnace top charging hopper of the furnace top charging system for smelting. The electric arc melts the furnace charge, and the reducing agent oxidizes the iron oxide to obtain slag liquid. The electric arc stirs the molten pool slag liquid to make the slag liquid composition uniform. Step 4: The slag liquid is discharged from the slag outlet into the slag discharge system, and after cooling, crushing and powder selection, high-titanium slag product is obtained; Step 5: The fine-grained titanium-rich material generated during the production of high-titanium slag is loaded back into the furnace top hopper of the furnace top charging system, and the above smelting steps are repeated for recycling.

[0005] Furthermore, the electric arc furnace is an AC electric arc furnace, and the smelting method is a closed-loop open-arc smelting. The closed-loop open-arc smelting method constructs a relatively closed smelting space, which functions to reduce the spillover of dust pollutants during the smelting process and reduce the impact on the environment.

[0006] Furthermore, the furnace top charging system includes a furnace top hopper that can control the charging point and charging speed. According to different stages of smelting and the reaction conditions in the furnace, it accurately transports fine-grained titanium-rich materials, titanium concentrate, and reducing agent materials to appropriate positions in the furnace and adds them at an appropriate speed, making the distribution of the furnace materials more reasonable, promoting uniform mixing and full reaction of the furnace materials, and improving the smelting effect and product quality stability.

[0007] Furthermore, the charging points corresponding to the furnace top hopper include edge charging points, center charging points, and main charging points. The edge charging points utilize the high grade and high melting point of the high-titanium slag fine powder to add the fine powder to the edge area, which plays a role in protecting the furnace lining and extending the service life of the furnace body. The center charging points and main charging points can add the main furnace charge to the key reaction area in the furnace according to the composition of the furnace charge and the reaction process, so that the furnace charge can quickly participate in the reaction, improve smelting efficiency, and optimize the reaction process in the furnace.

[0008] Furthermore, the slag discharge system is located below the slag outlet of the electric arc furnace; this ensures the continuity and stability of the slag discharge process and provides a good foundation for subsequent slag liquid cooling, crushing, and powder selection processes.

[0009] Furthermore, the fine-grained titanium-rich material is produced during the crushing and powdering process to produce high-titanium slag. The particle size range of 0.085mm-0.074mm accounts for 15%, the particle size range of less than 0.074mm accounts for 85%, and the titanium grade reaches 88%.

[0010] Furthermore, the titanium concentrate has a titanium grade of 53% and a particle size of less than 200 mesh.

[0011] Furthermore, the reducing agent has a fixed carbon content of more than 88% and an ash content of less than 7%.

[0012] Furthermore, the amount of fine-grained titanium-rich material added is 5%-15% of the amount of titanium concentrate added, and the amount of reducing agent added is 10%-15% of the amount of titanium concentrate added.

[0013] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: This invention enables the application of fine-grained titanium-rich materials in the smelting process of high-titanium slag, effectively utilizing the titanium element without introducing any raw materials other than titanium concentrate, reducing agent, and the fine-grained titanium-rich materials generated during the processing of high-titanium slag products. This avoids introducing new impurities into the high-titanium slag. Simultaneously, the fine-grained titanium-rich materials are fully integrated into the slag liquid through arc stirring, ensuring uniform composition. By adjusting the amount of reducing agent added, the titanium grade in the slag liquid is controlled to reach 90%, meeting the raw material grade requirements for the titanium dioxide chlorination process. The slag liquid is cooled, crushed, and powdered to obtain a high-titanium slag product with qualified particle size. The fine-grained titanium-rich materials generated during the production of the high-titanium slag product are then added back into the furnace for re-smelting, achieving the recycling and processing of these materials. Through a closed-loop smelting method, the titanium element value in the fine-grained titanium-rich materials is fully extracted, and the reduction degree of the furnace charge is effectively controlled by precisely adjusting the amount of reducing agent added. Throughout the entire process, dust pollution can be avoided, and the final slag composition can be ensured to meet the stringent requirements of the titanium dioxide chlorination process, thus achieving efficient resource utilization and process optimization and upgrading. Detailed Implementation

[0014] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0015] A method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting, comprising the following steps: Step 1: The fine-grained titanium-rich material is loaded into the top hopper of the electric arc furnace top charging system used for smelting high-titanium slag, in preparation for subsequent smelting. Step 2: Load the titanium concentrate and reducing agent into the furnace top silo to complete the initial storage of furnace charge; Step 3: According to a certain ratio, fine-grained titanium-rich material, titanium concentrate, and reducing agent are fed into the electric arc furnace through the furnace top charging hopper of the furnace top charging system for smelting. The electric arc melts the furnace charge, and the reducing agent oxidizes the iron oxide to obtain slag liquid. The electric arc stirs the molten pool slag liquid to make the slag liquid composition uniform. Step 4: The slag liquid is discharged from the slag outlet into the slag discharge system, and after cooling, crushing and powder selection, high-titanium slag product is obtained; Step 5: The fine-grained titanium-rich material generated during the production of high-titanium slag is loaded back into the furnace top hopper of the furnace top charging system, and the above smelting steps are repeated for recycling.

[0016] The electric arc furnace is an AC electric arc furnace, and the smelting method is closed-loop open-arc smelting. The closed-loop open-arc smelting method constructs a relatively closed smelting space in terms of structure, which functions to reduce the leakage of dust pollutants during the smelting process and reduce the impact on the environment.

[0017] The furnace top charging system includes a furnace top hopper that can control the charging point and charging speed. According to different stages of smelting and the reaction conditions in the furnace, it accurately transports fine-grained titanium-rich materials, titanium concentrate, and reducing agent materials to appropriate positions in the furnace and adds them at appropriate speeds, making the distribution of furnace materials more reasonable, promoting uniform mixing and full reaction of furnace materials, and improving the smelting effect and product quality stability.

[0018] The charging points corresponding to the furnace top hopper include edge charging points, center charging points, and main charging points. Edge charging points can utilize the high grade and high melting point of high-titanium slag fine powder to add fine powder to the edge area, which can protect the furnace lining and extend the service life of the furnace body. Center charging points and main charging points can add the main furnace charge to the key reaction area in the furnace according to the composition of the furnace charge and the reaction process, so that the furnace charge can quickly participate in the reaction, improve smelting efficiency, and optimize the reaction process in the furnace.

[0019] The slag discharge system is located below the slag outlet of the electric arc furnace; it ensures the continuity and stability of the slag discharge process and provides a good foundation for subsequent slag liquid cooling, crushing, and powder selection processes.

[0020] The fine-grained titanium-rich material is produced during the crushing and powdering process to produce high-titanium slag. The particle size range of 0.085mm-0.074mm accounts for 15%, the particle size range of less than 0.074mm accounts for 85%, and the titanium grade reaches 88%.

[0021] The titanium concentrate has a titanium grade of 53% and a particle size of less than 200 mesh.

[0022] The reducing agent has a fixed carbon content of more than 88% and an ash content of less than 7%.

[0023] The amount of fine-grained titanium-rich material added is 5%-15% of the amount of titanium concentrate added, and the amount of reducing agent added is 10%-15% of the amount of titanium concentrate added.

[0024] Add a weighing hopper and feed pipe to the furnace top, or rationally occupy one edge silo to construct a dedicated furnace top feeding device. This device can accurately add fine powder into the furnace, laying the foundation for the effective utilization of subsequent fine-grained titanium-rich materials. The furnace top feeding system includes an optimized and upgraded furnace top silo, enabling precise control of the feeding point and feeding speed. The furnace top silo has a variety of feeding points, covering edge feeding points, center feeding points, and main feeding points, allowing for flexible selection of feeding positions according to smelting needs and improving smelting efficiency. Feeding system: Raw materials are transported to the silo using belt conveyor equipment. The silo is equipped with a precise weighing device to accurately weigh the raw materials before orderly feeding them into the furnace top silo, ensuring precise control of the feeding amount. Batching: A separate edge feeding silo is designated from the furnace top silo, specifically for the separate addition of high-titanium slag fine powder. This method achieves independent control of the high-titanium slag fine powder addition path, facilitating better control of the smelting process. Material Feeding: Utilizing the high grade and high melting point of high-titanium slag fine powder, it is precisely fed to the edge of the electric arc furnace. This operation not only fully utilizes the characteristics of the high-titanium slag fine powder but also provides excellent furnace protection during smelting, extending the furnace's service life. Power Supply Parameter Selection: Following normal furnace charge smelting methods, the appropriate voltage level and current are carefully selected. During smelting, close monitoring of furnace lining temperature changes and molten pool diameter is maintained. If the molten pool diameter decreases, the voltage is promptly increased to expand the molten pool and ensure smooth smelting. Power Supply Selection: Taking into account factors such as the material processing, slag discharge rate, and furnace protection effect, the overall power supply requirement after adding high-titanium slag fine powder and normal titanium concentrate is accurately determined. Through continuous adjustments, the optimal power supply OPR is determined to achieve efficient energy utilization and optimized smelting results. Post-Slag Discharge Observation: After slag discharge, the quality of the raw slag is promptly monitored, carefully checking for any impact from the smelting fine powder. Continuous tracking ensures that the overall quality of the raw slag meets requirements, providing quality assurance for subsequent production.

[0025] By employing a closed-loop smelting method, the titanium value in fine-grained titanium-rich materials is fully extracted. Simultaneously, the reduction degree of the furnace charge is effectively controlled through precise adjustment of the reducing agent dosage. Throughout the entire process, dust pollution is avoided, and the final slag composition meets the stringent requirements of the titanium dioxide chlorination process, achieving efficient resource utilization and process optimization.

[0026] This invention enables the application of fine-grained titanium-rich materials in the smelting process of high-titanium slag, effectively utilizing the titanium element without introducing any raw materials other than titanium concentrate, reducing agent, and the fine-grained titanium-rich materials generated during the processing of high-titanium slag products. This avoids introducing new impurities into the high-titanium slag. Simultaneously, the fine-grained titanium-rich materials are fully integrated into the slag liquid through arc stirring, ensuring uniform composition. By adjusting the amount of reducing agent added, the titanium grade in the slag liquid is controlled to reach 90%, meeting the raw material grade requirements for the titanium dioxide chlorination process. The slag liquid is cooled, crushed, and powdered to obtain a high-titanium slag product with qualified particle size. The fine-grained titanium-rich materials generated during the production of the high-titanium slag product are then added back into the furnace for re-smelting, achieving the recycling and processing of these materials. Through a closed-loop smelting method, the titanium element value in the fine-grained titanium-rich materials is fully extracted, while the reduction degree of the furnace charge is effectively controlled by precisely adjusting the amount of reducing agent added. Throughout the entire process, dust pollution can be avoided, and the final slag composition can be ensured to meet the stringent requirements of the titanium dioxide chlorination process, thus achieving efficient resource utilization and process optimization and upgrading.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the content of this specification are included within the scope of the present invention.

Claims

1. A method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting, characterized in that, Follow these steps: Step 1: The fine-grained titanium-rich material is loaded into the top hopper of the electric arc furnace top charging system used for smelting high-titanium slag, in preparation for subsequent smelting. Step 2: Load the titanium concentrate and reducing agent into the furnace top silo to complete the initial storage of furnace charge; Step 3: According to a certain ratio, fine-grained titanium-rich material, titanium concentrate, and reducing agent are fed into the electric arc furnace through the furnace top charging hopper of the furnace top charging system for smelting. The electric arc melts the furnace charge, and the reducing agent oxidizes the iron oxide to obtain slag liquid. The electric arc stirs the molten pool slag liquid to make the slag liquid composition uniform. Step 4: The slag liquid is discharged from the slag outlet into the slag discharge system, and after cooling, crushing and powder selection, high-titanium slag product is obtained; Step 5: The fine-grained titanium-rich material generated during the production of high-titanium slag is loaded back into the furnace top hopper of the furnace top charging system, and the above smelting steps are repeated for recycling.

2. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The electric arc furnace is an AC electric arc furnace, and the smelting method is a closed-loop, open-arc smelting.

3. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The furnace top feeding system includes a furnace top hopper that enables the control of feeding points and feeding speed.

4. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 3, characterized in that: The corresponding material feeding points in the furnace top hopper include edge feeding points, center feeding points, and main feeding points.

5. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The slag removal system is located below the slag outlet of the electric arc furnace.

6. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The fine-grained titanium-rich material is produced during the crushing and powdering process to produce high-titanium slag. The particle size range of 0.085mm-0.074mm accounts for 15%, the particle size range of less than 0.074mm accounts for 85%, and the titanium grade reaches 88%.

7. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The titanium concentrate has a titanium grade of 53% and a particle size of less than 200 mesh.

8. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The reducing agent has a fixed carbon content of more than 88% and an ash content of less than 7%.

9. The method for recycling fine-grained titanium-rich materials using high-titanium slag from electric furnace smelting according to claim 1, characterized in that: The amount of fine-grained titanium-rich material added is 5%-15% of the amount of titanium concentrate added, and the amount of reducing agent added is 10%-15% of the amount of titanium concentrate added.