High-cost-performance carburant for steelmaking and use method thereof
By using cost-effective dry coke quenching carbon enhancers, adjusting the addition timing and controlling the argon blowing flow, the problems of existing carbon enhancers floating and carbon burning during steelmaking are solved, and efficient carbon recovery and reducing steel billets are achieved. The effect of manufacturing cost.
Patent Information
- Application Number
- CN202411325145.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-01-17
AI Technical Summary
Existing carbon enhancers are prone to float during steelmaking, resulting in carbon burnout and local enrichment, the carbon increase effect is unstable, and the market has high cost-effectiveness requirements.
The dry coke quenching variety with a mass percentage of fixed carbon 85-90%, ash content 5-13%, volatile content <1.5%, sulfur content <0.8%, and moisture content <0.5%, and a carbon increaser with a particle size of 1-10mm was used. By adjusting the addition timing and controlling the argon blowing flow, the yield of the carbonizer is improved.
The carbon recovery rate is achieved by more than 90%, reducing the billet manufacturing cost by 1.5-6.5 yuan/ton of steel, and improving the stability and cost-effectiveness of the carbon increase effect.
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of steelmaking raw and auxiliary materials applied to iron and steel metallurgy, and in particular relates to a high-cost-effective steelmaking carburizer and a use method thereof. Background Art
[0002] In the process of steelmaking, metallurgical enterprises, in order to adjust the carbon content in steel, perform carburization treatment on molten steel during the steel-making process and refining process to meet the carbon content requirements of steel. At present, common carburizers include asphalt coke carburizer, petroleum coke carburizer, artificial graphite carburizer, coal-based carburizer and carbon-containing ferroalloys, etc. Each type of carburizer has advantages and disadvantages and different application steel types. Carburizers are generally solid particles (some powders), with a small specific gravity. They are easy to float on the slag surface during use, causing carbon burning or local enrichment of carbon in molten steel, resulting in unstable carburization effect. With the development and maturity of new smelting processes, the market has higher and higher requirements for the cost-effectiveness of carburizers to meet the needs of high-quality smelting. Therefore, developing a carburizer with good cost-effectiveness and a method to improve the carburization effect has become an urgent problem to be solved in the industry. Summary of the invention
[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art or related art. To this end, one purpose of the present invention is to provide a high cost-effective steelmaking carburizer. Another purpose of the present invention is to provide a method for using the high cost-effective steelmaking carburizer.
[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0005] The invention discloses a high-cost-effective recarburizer for steelmaking, which has the following chemical components by mass percentage: fixed carbon 85-90%, ash 5-13%, volatile matter less than 1.5%, sulfur less than 0.8%, moisture less than 0.5% and a particle size of 1-10 mm.
[0006] Furthermore, the selected dry quenched coke variety has a particle size of 1-10 mm and a moisture content of <0.5%.
[0007] A method for using a high-cost-effective steelmaking carburizer is added to molten steel during the converter tapping process and the molten steel refining process. The carburizer recovery rate is improved by adjusting the timing of adding the carburizer and controlling the argon blowing flow rate, thereby achieving the purpose of carburizing the molten steel.
[0008] Furthermore, the carbon recovery rate is more than 90%.
[0009] Furthermore, compared with using asphalt coke carburizer, petroleum coke carburizer and coal-based carburizer, the manufacturing cost of steel billets can be reduced by 1.5-6.5 yuan / ton of steel.
[0010] Furthermore, it is suitable for 80-ton converter production lines to smelt steel with a carbon content of 0.20-0.24%.
[0011] Furthermore, it is suitable for 150-ton converter production lines to smelt steel with a carbon content of 0.28-0.32%.
[0012] Furthermore, it is suitable for 210-ton converter production lines to smelt steel with a carbon content of 0.18-0.21%.
[0013] Furthermore, it is suitable for 260-ton converter production lines to smelt steel with a carbon content of 0.17-0.29%.
[0014] Furthermore, the timing of adding the recarburizer is adjusted to 40 to 80 seconds after the converter starts tapping and 20 to 40 seconds after the refining starts heating, the argon blowing flow rate is controlled to 500 ml / min to 1500 ml / min, and the recarburizer is added to the molten steel level between the center of the ladle and the argon port of the ladle.
[0015] Compared with the prior art, the beneficial technical effects of the present invention are:
[0016] The raw material of a high-cost-effective steelmaking carburizer provided by the present invention is coke produced by dry quenching process, and the selected dry quenching coke variety has a particle size of 1-10mm and a moisture content of less than 0.5%. Dry quenching coke is the main fuel used in the ironmaking process of large-scale long-process steel enterprises. The carburizer provided by the present invention can be produced by crushing, and the production cost is low. The method for using the carburizer provided by the present invention mainly improves the carburizer yield and improves the carburizing effect by adjusting the timing of adding the carburizer and controlling the argon blowing flow rate. DETAILED DESCRIPTION
[0017] The raw material of the steel-making recarburizer is coke produced by dry quenching process, which is crushed into solid particles by crusher, and small particles of 1-10 mm are screened out and loaded into the silo for direct use or packaged in 10 kg. The main chemical composition of the steel-making recarburizer is: fixed carbon 85-90%, water <0.5%.
[0018] The method for using the carburizer for steelmaking provided by the present invention is as follows: the carburizer is added to molten steel during the process of steel tapping from a converter and the process of molten steel refining; when no slag is added or a small amount of slag is added, the carbon burning loss and the local enrichment of carbon in the molten steel are reduced, and the recovery rate of the carburizer is improved by adjusting the timing of adding the carburizer, controlling the argon blowing flow rate, and adjusting the position of the molten steel liquid level in the ladle after the carburizer is added.
[0019] The steelmaking recarburizer and the use method provided by the present invention are respectively applied to 80-ton converter, 150-ton converter, 210-ton converter and 260-ton converter. The application results show that when using converter production lines with different nominal capacities and steel grades with different carbon contents, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel compared with the use of asphalt coke recarburizer, petroleum coke recarburizer and coal-based recarburizer, and the promotion and application prospects are good.
[0020] Example 1
[0021] The raw material of the steel-making recarburizer is coke produced by dry quenching process, which is crushed into solid particles by crusher, and small particles of 1-10 mm are screened out and loaded into the silo for direct use or packaged in 10 kg. The main chemical composition of the steel-making recarburizer is: fixed carbon 85-90%, water <0.5%.
[0022] For the 80-ton converter production line, when smelting steel with a carbon content of 0.20-0.24%, the recarburizer is added to the molten steel during the converter tapping process and the molten steel refining process. When no slag is added or a small amount of slag is added, the timing of adding the recarburizer is adjusted to 45 seconds after the converter starts tapping and 25 seconds after the refining starts heating. The argon blowing flow rate is controlled to 700ml / min. The recarburizer is added to the molten steel liquid level between the center of the ladle and the argon port of the ladle. The carbon recovery rate is more than 90%, and the quality of the molten steel is stable. Compared with the use of asphalt coke recarburizer, petroleum coke recarburizer and coal-based recarburizer, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel.
[0023] Example 2
[0024] The raw material of the steel-making recarburizer is coke produced by dry quenching process, which is crushed into solid particles by crusher, and small particles of 1-10 mm are screened out and loaded into the silo for direct use or packaged in 10 kg. The main chemical composition of the steel-making recarburizer is: fixed carbon 85-90%, water <0.5%.
[0025] For a 150-ton converter production line, when smelting steel with a carbon content of 0.28-0.32%, the recarburizer is added to the molten steel during the converter tapping process and the molten steel refining process. When no slag is added or a small amount of slag is added, the timing of adding the recarburizer is adjusted to 65 seconds after the converter starts tapping and 30 seconds after the refining starts heating. The argon blowing flow rate is controlled to 1000ml / min, and the recarburizer is added to the molten steel liquid level between the center of the ladle and the argon port of the ladle. The carbon recovery rate is more than 90%, and the quality of the molten steel is stable. Compared with the use of asphalt coke recarburizer, petroleum coke recarburizer and coal-based recarburizer, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel.
[0026] Example 3
[0027] The raw material of the steel-making recarburizer is coke produced by dry quenching process, which is crushed into solid particles by crusher, and small particles of 1-10 mm are screened out and loaded into the silo for direct use or packaged in 10 kg. The main chemical composition of the steel-making recarburizer is: fixed carbon 85-90%, water <0.5%.
[0028] For the 210-ton converter production line, when smelting steel with a carbon content of 0.18-0.21%, the recarburizer is added to the molten steel during the converter tapping process and the molten steel refining process. When no slag is added or a small amount of slag is added, the timing of adding the recarburizer is adjusted to 75 seconds after the converter starts tapping and 38 seconds after the refining starts heating. The argon blowing flow rate is controlled to 1200ml / min. The recarburizer is added to the molten steel liquid level between the center of the ladle and the argon port of the ladle. The carbon recovery rate is more than 90%, and the quality of the molten steel is stable. Compared with the use of asphalt coke recarburizer, petroleum coke recarburizer and coal-based recarburizer, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel.
[0029] Example 4
[0030] The raw material of the steel-making recarburizer is coke produced by dry quenching process, which is crushed into solid particles by crusher, and small particles of 1-10 mm are screened out and loaded into the silo for direct use or packaged in 10 kg. The main chemical composition of the steel-making recarburizer is: fixed carbon 85-90%, water <0.5%.
[0031] For the 260-ton converter production line, when smelting steel with a carbon content of 0.17-0.29%, the recarburizer is added to the molten steel during the converter tapping process and the molten steel refining process. When no slag is added or a small amount of slag is added, the timing of adding the recarburizer is adjusted to 80 seconds after the converter starts tapping and 20 seconds after the refining starts heating. The argon blowing flow rate is controlled to 600ml / min. The recarburizer is added to the molten steel liquid level between the center of the ladle and the argon port of the ladle. The carbon recovery rate is more than 90%, and the quality of the molten steel is stable. Compared with the use of asphalt coke recarburizer, petroleum coke recarburizer and coal-based recarburizer, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel.
[0032] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A high cost-effective steelmaking recarburizer, characterized in that: Its chemical composition, in terms of mass percentage, is: fixed carbon 85-90%, ash 5-13%, volatile matter <1.5%, sulfur <0.8%, moisture <0.5% and particle size 1-10 mm.
2. The high cost-effective steelmaking recarburizer according to claim 1, characterized in that: The dry quenching coke process is used to produce coke, and the selected dry quenching coke variety has a particle size of 1-10mm and a moisture content of less than 0.5%.
3. The method for using the high cost-effective steelmaking carburizer according to claim 1, characterized in that: It is added to the molten steel during the converter tapping process and the steel refining process. By adjusting the timing of adding the carburizer and controlling the argon blowing flow rate, the carburizer recovery rate is improved and the purpose of carburizing the molten steel is achieved.
4. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: The carbon recovery rate is over 90%.
5. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: Compared with using asphalt coke carburizer, petroleum coke carburizer and coal-based carburizer, the billet manufacturing cost is reduced by 1.5-6.5 yuan / ton of steel.
6. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: It is suitable for 80-ton converter production line, smelting steel with carbon content of 0.20-0.24%.
7. The method for using the high cost-effective steelmaking recarburizer according to claim 3, characterized in that: It is suitable for 150-ton converter production line, smelting steel with carbon content of 0.28-0.32%.
8. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: It is suitable for 210-ton converter production line, smelting steel with carbon content of 0.18-0.21%.
9. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: It is suitable for 260-ton converter production line, smelting steel with carbon content of 0.17-0.29%.
10. The method for using the high cost-effective steelmaking carburizer according to claim 3, characterized in that: The timing of adding the carburizer is adjusted to 40 to 80 seconds after the converter starts tapping and 20 to 40 seconds after the refining starts heating. The argon blowing flow rate is controlled to 500 ml / min to 1500 ml / min. The carburizer is added to the molten steel level between the center of the ladle and the argon port of the ladle.