Smelting method for LF (ladle furnace)

Abstract

The invention relates to a smelting method for an LF refining furnace, and belongs to the technical field of external refining methods of metallurgical engineering. According to the technical scheme, the method comprises the following steps of: designing a flow: constructing a process control plate, a data communication plate and an HMI picture design plate; an automatic feeding model is designed, a lowest-cost feeding scheme is formulated, alloy material calculation logic is designed, and alloy materials are controlled to be accurately added; a temperature model is established, and auxiliary material input temperature compensation and steel ladle radiation heat dissipation increase control are carried out in the heating process; and an automatic bottom blowing model is established, and argon control is carried out at different stages. The method has the beneficial effects that the real-time tracking and monitoring of the refining process are realized; and aiming at different steel types, each operation and operation link of refining is standardized, the control accuracy of each link of refining is improved, and the goal of automatic refining is achieved.

Description

Technical Field

[0001] The invention relates to a smelting method for an LF refining furnace, belonging to the technical field of refining methods outside a metallurgical engineering furnace. Background Art

[0002] LF refining is an important process in the molten steel treatment process, and its main task is to smelt qualified molten steel that meets the requirements. Under the environment of economic globalization and market internationalization, major steel companies in various countries have recognized the important role of automation technology in the development of enterprises. As an important part of the steelmaking-refining-continuous casting process, the LF furnace refining link aims to stably supply qualified molten steel with qualified ingredients and low superheat, so as to quickly and stably match other processes, ensure stable and efficient operation of equipment, and achieve stable production from steelmaking to continuous casting.

[0003] In March 2021, the "one-button" RH refining independently developed by Ansteel Bayuquan Steelmaking Department was put into production, realizing RH one-button refining, automatic control of all links in the refining process such as molten steel circulation, free oxygen content adjustment, deoxidation, temperature adjustment, and economic alloying. The hit rate of the end point composition and temperature of molten steel refining reached 95%.

[0004] In May 2021, the EPC project for the intelligent upgrade and transformation of the No. 4 LF refining furnace in the new area of ​​the steelmaking plant of Shandong Steel Group Laiwu Branch was officially put into use, achieving breakthroughs in many key core technologies such as model calculation and automatic feeding, and fully automatic ladle covering. It became the first EPC project independently developed for "one-click" smart steelmaking in the domestic LF refining furnace industry.

[0005] At present, some refining links in steel mills are completed manually by operators. Operators control refining production based on their experience, which is prone to large human errors, increasing workload and affecting quality stability. The original refining alloy feeding model and temperature model cannot adapt to actual on-site production and cannot be applied in the on-site smelting process. The refining and smelting process is highly arbitrary, and some stages cannot be skipped or coexist and affect each other. The system cannot be used when the production rhythm is tight, which greatly delays the production rhythm and affects production efficiency. With the continuous expansion of production varieties and the continuous improvement of product quality, the level of automation in refining needs to be improved. Summary of the invention

[0006] The purpose of the present invention is to provide a smelting method for an LF refining furnace. Through the LF furnace alloy feeding model and temperature prediction model, automatic calculation of alloy raw materials and real-time prediction of molten steel temperature are realized. The alloy feeding amount and predicted temperature value calculated by the model are transmitted to the corresponding first-level automatic control system in real time to realize automatic adjustment of molten steel temperature and molten steel composition; by displaying the basic information of molten steel and various process variables during the LF furnace refining process, real-time tracking and monitoring of the refining process are realized; for different steel grades, various refining operations and operating links are standardized, the accuracy of control of each refining link is improved, the goal of automatic refining is achieved, and the above-mentioned problems existing in the background technology are effectively solved.

[0007] The technical solution of the present invention is: a smelting method for a LF refining furnace, comprising the following steps:

[0008] (1) Process design, building process control module, data communication module and HMI screen design module;

[0009] (2) Automatic feeding model design: according to the steel type and refining data, as well as the inspection and testing data, calculate the amount of material needed to be added for refining to ensure the composition requirements of the steel type, formulate the lowest cost feeding plan, design the alloy material calculation logic, and control the precise addition of alloy materials;

[0010] (3) Establish a temperature model, pre-calculate the dynamic temperature, and send the calculated data to the PLC at the right time to compensate for the temperature of the auxiliary materials during the heating process and increase the radiation heat dissipation of the ladle wall;

[0011] (4) Establish an automatic bottom blowing model to control argon gas in different stages.

[0012] In step (1), building the HMI screen design module includes the following five aspects:

[0013] (a) After the furnace number is taken over in the plan, the steel car with the argon tube connected to the station arrives at the refining position, click on the refining start on the secondary screen, and the amount of auxiliary materials added will be automatically calculated and sent to the primary shell breaking and auxiliary material input instructions;

[0014] (b) After the shell is broken, the temperature is measured manually. After the temperature measurement data is collected, the power supply time is calculated and slag melting begins. The three refining processes cannot be powered at the same time. The power supply information of the three refining processes needs to be collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate;

[0015] (c) After the slag-making stage, the desulfurization stage begins. If the desulfurization stirring time, flow rate and al weight are not calculated, the default configuration data is used;

[0016] (d) After the desulfurization stage is completed, the temperature is measured and sampled for oxygen determination. After the temperature measurement data is collected, the temperature rise stage can be circulated, the time for feeding is calculated, and the temperature rise begins. The three refineries cannot be powered at the same time. The power supply information of the three refineries is collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate in the temperature rise stage;

[0017] (e) When the ingredients arrive, they are automatically mixed according to the calculation. They are added directly during the power-on process. The argon is maintained at the flow rate in the heating stage. After the power-on is completed, the argon is adjusted to the stirring flow rate and then adjusted to the default flow rate after the stirring time is completed. The materials are added for feeding. If the sulfur does not meet the requirements, the desulfurization stirring time is calculated and the stirring is continued. After the stirring is completed, the flow rate becomes the default flow rate for the alloying stage. If the ingredients meet the requirements, the length of the calcium treatment calcium line is calculated. If the calculation does not require a calcium line, the soft blowing stage is entered.

[0018] In the step (e), the ingredients directly added during the power supply process do not include a recarburizer.

[0019] In the step (2), the lowest cost feeding scheme calculates the material with the lowest price that reaches the standard card components through the cost prices of various materials entered into the secondary system for feeding.

[0020] In the step (2), the alloy material calculation logic is designed, and the material composition from different sources is saved in the form of a database through the composition control structure model calculation program and the solution program, which can be called at any time.

[0021] In the step (2), the alloy material is accurately added through statistical calculation of the absorption rate of the alloy and the core wire, and a corresponding table of the absorption rate of the alloy and the core wire is formulated for different deoxidation methods and maintained in the secondary system. The amount of material added is calculated according to the steel liquid composition information, and the material is automatically unloaded through the high-level silo, and the weighing system is started. After the weighing is completed, the conveyor belt equipment is automatically started to unload the material.

[0022] The deoxidation method includes silicon deoxidation and aluminum deoxidation.

[0023] In the step (3), the formula for calculating the heat dissipation by radiation from the ladle wall is as follows:

[0024]

[0025] where ρ a , b 、c a 、c b , μa and μb are the density, specific heat capacity and thermal conductivity of two different refractory materials respectively.

[0026] In the step (4), during the power supply heating stage, the argon blowing is controlled at 300-400NL / min; during the alloying stage, the argon blowing is controlled at 400-500NL / min; during the carburizing and desulfurization stage, the argon blowing is controlled at 800-900NL / min; during the wire feeding stage, the argon blowing is controlled at 80-100NL / min; during the soft blowing stage, the argon blowing is controlled at 60-100NL / min.

[0027] There is also a data communication interface for data communication with MES and PLC. The secondary system receives MES production instructions and specification-related information, and performs orderly operations according to the instructions of MES. After completion, the actual production performance data is uploaded to MES; the PLC production status is read in real time, and the secondary settings are sent to the PLC system through model calculation and background logic decision-making to organize automatic refining production.

[0028] It also includes production information management. The system process tracks and records all events, manages each process of the furnace production process, and reproduces the refining production process through historical records, log files and screen curve functions.

[0029] The beneficial effects of the present invention are as follows: automatic calculation of alloy raw materials and real-time prediction of molten steel temperature are realized through the LF furnace alloy charging model and temperature prediction model; the alloy charging amount and predicted temperature value calculated by the model are transmitted to the corresponding first-level automatic control system in real time to realize automatic adjustment of molten steel temperature and molten steel composition; real-time tracking and monitoring of the refining process are realized by displaying the basic information of molten steel and various process variables during the LF furnace refining process; and various refining operations and operation links are standardized for different steel grades, so as to improve the accuracy of control of various refining links and realize the goal of automatic refining. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a data communication schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the alloy calculation process of the present invention;

[0032] Figure 3 This is a schematic diagram of the temperature compensation design of the auxiliary materials during the heating process of the hair bile;

[0033] Figure 4 A schematic diagram is added for the radiation heat dissipation of the ladle of the present invention;

[0034] In the figure: working layer 1, permanent layer 2, insulation layer 3, ladle center 4, steel shell 5. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] A smelting method for a LF refining furnace comprises the following steps:

[0037] (1) Process design, building process control module, data communication module and HMI screen design module;

[0038] (2) Automatic feeding model design: according to the steel type and refining data, as well as the inspection and testing data, calculate the amount of material needed to be added for refining to ensure the composition requirements of the steel type, formulate the lowest cost feeding plan, design the alloy material calculation logic, and control the precise addition of alloy materials;

[0039] (3) Establish a temperature model, pre-calculate the dynamic temperature, and send the calculated data to the PLC at the right time to compensate for the temperature of the auxiliary materials during the heating process and increase the radiation heat dissipation of the ladle wall;

[0040] (4) Establish an automatic bottom blowing model to control argon gas in different stages.

[0041] In step (1), building the HMI screen design module includes the following five aspects:

[0042] (a) After the furnace number is taken over in the plan, the steel car with the argon tube connected to the station arrives at the refining position, click on the refining start on the secondary screen, and the amount of auxiliary materials added will be automatically calculated and sent to the primary shell breaking and auxiliary material input instructions;

[0043] (b) After the shell is broken, the temperature is measured manually. After the temperature measurement data is collected, the power supply time is calculated and slag melting begins. The three refining processes cannot be powered at the same time. The power supply information of the three refining processes needs to be collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate;

[0044] (c) After the slag-making stage, the desulfurization stage begins. If the desulfurization stirring time, flow rate and al weight are not calculated, the default configuration data is used;

[0045] (d) After the desulfurization stage is completed, the temperature is measured and sampled for oxygen determination. After the temperature measurement data is collected, the temperature rise stage can be circulated, the time for feeding is calculated, and the temperature rise begins. The three refineries cannot be powered at the same time. The power supply information of the three refineries is collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate in the temperature rise stage;

[0046] (e) When the ingredients arrive, they are automatically mixed according to the calculation. They are added directly during the power-on process. The argon is maintained at the flow rate in the heating stage. After the power-on is completed, the argon is adjusted to the stirring flow rate and then adjusted to the default flow rate after the stirring time is completed. The materials are added for feeding. If the sulfur does not meet the requirements, the desulfurization stirring time is calculated and the stirring is continued. After the stirring is completed, the flow rate becomes the default flow rate for the alloying stage. If the ingredients meet the requirements, the length of the calcium treatment calcium line is calculated. If the calculation does not require a calcium line, the soft blowing stage is entered.

[0047] In the step (e), the ingredients directly added during the power supply process do not include a recarburizer.

[0048] In the step (2), the lowest cost feeding scheme calculates the material with the lowest price that reaches the standard card components through the cost prices of various materials entered into the secondary system for feeding.

[0049] In the step (2), the alloy material calculation logic is designed, and the material composition from different sources is saved in the form of a database through the composition control structure model calculation program and the solution program, which can be called at any time.

[0050] In the step (2), the alloy material is accurately added through statistical calculation of the absorption rate of the alloy and the core wire, and a corresponding table of the absorption rate of the alloy and the core wire is formulated for different deoxidation methods and maintained in the secondary system. The amount of material added is calculated according to the steel liquid composition information, and the material is automatically unloaded through the high-level silo, and the weighing system is started. After the weighing is completed, the conveyor belt equipment is automatically started to unload the material.

[0051] The deoxidation method includes silicon deoxidation and aluminum deoxidation.

[0052] In the step (3), the formula for calculating the heat dissipation by radiation from the ladle wall is as follows:

[0053]

[0054] where ρ a , b 、c a 、c b , μa and μb are the density, specific heat capacity and thermal conductivity of two different refractory materials respectively.

[0055] In the step (4), during the power supply heating stage, the argon blowing is controlled at 300-400NL / min; during the alloying stage, the argon blowing is controlled at 400-500NL / min; during the carburizing and desulfurization stage, the argon blowing is controlled at 800-900NL / min; during the wire feeding stage, the argon blowing is controlled at 80-100NL / min; during the soft blowing stage, the argon blowing is controlled at 60-100NL / min.

[0056] There is also a data communication interface for data communication with MES and PLC. The secondary system receives MES production instructions and specification-related information, and performs orderly operations according to the instructions of MES. After completion, the actual production performance data is uploaded to MES; the PLC production status is read in real time, and the secondary settings are sent to the PLC system through model calculation and background logic decision-making to organize automatic refining production.

[0057] It also includes production information management. The system process tracks and records all events, manages each process of the furnace production process, and reproduces the refining production process through historical records, log files and screen curve functions.

[0058] In practical applications, through the process computer system (Level 2), effective and reliable production operation standards are provided, mathematical model calculations are involved, effective and reliable actual operation tracking and operation reports are generated, effective and reliable operation history data are provided, and effective information management of refining production is realized. According to the existing smelting operation steps, tracking and recording are carried out, and unified smelting steps are formulated with operators, and automatic refining is divided into: process design, automatic feeding model design, temperature model establishment and automatic bottom blowing model establishment. The process steps are divided into 9 stages, including initial, auxiliary material input, slag, desulfurization, heating, alloying, calcium treatment, soft blowing, and completion. The set value model is based on the current smelting molten steel composition, temperature and other conditions. After being triggered, the next step of deoxidation, slag making, heating, alloying, and calcium treatment operations are theoretically calculated and guiding opinions are given.

[0059] Process design includes three major sections: process control, data communication, and HMI screen design.

[0060] Build a process control module to build a secondary system process control to control the overall automatic refining process. Some stages can be skipped or coexist to eliminate the mutual influence of each process stage and meet the tight production rhythm.

[0061] Data communication receives production instructions, specifications and other related information through socket communication, and uploads the production process information and production performance information of each furnace to the Level 2.5 system; communication with the PLC system is carried out through OPC using DDE; the secondary system communicates internally through message queues and shared memory, and the database uses SqlServer2014; the front-end and back-end are separated, and communicate through sockets, and each HMI corresponds to a host program.

[0062] HMI screen design includes the following five aspects:

[0063] (a) After the furnace number is entered in the plan, the steel car with the argon gas pipe connected to the station arrives at the refining position, click on the refining start on the secondary screen, and the amount of auxiliary materials added will be automatically calculated. The shell breaking and auxiliary material input instructions are issued to the primary level;

[0064] (b) After the shell is broken, the temperature is measured manually. After the temperature measurement data is collected, the power supply time is calculated and slag melting begins. The three refining processes cannot be powered at the same time. The power supply information of the three refining processes needs to be collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate;

[0065] (c) After the slag-making stage, the desulfurization stage begins. If the desulfurization stirring time, flow rate, and Al weight are not calculated, the default configuration data will be used;

[0066] (d) After the desulfurization stage is completed, the temperature is measured and sampled for oxygen determination. After the temperature measurement data is collected, the temperature rise stage can be circulated, the time for feeding is calculated, and the temperature rise begins. The three refineries cannot be powered at the same time. The power supply information of the three refineries is collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate in the temperature rise stage;

[0067] (e) When the ingredients arrive, they are automatically mixed according to the calculation. They are added directly during the power-on process (excluding the carburizer). The argon is maintained at the flow rate in the heating stage. After the power-on is completed, the argon is adjusted to the stirring flow rate and then adjusted to the default flow rate after the stirring time is completed. The materials are added for feeding. If the sulfur does not meet the requirements, the desulfurization stirring time is calculated and the stirring is continued. After the stirring is completed, it becomes the default flow rate for the alloying stage. If the ingredients meet the requirements, the length of the calcium treatment calcium line is calculated. If the calculation does not require a calcium line, the soft blowing stage is entered.

[0068] The design of the automatic feeding model includes: the lowest cost feeding plan, designing the alloy calculation logic and controlling the precise addition of alloy.

[0069] The lowest cost feeding plan calculates the lowest price of the materials that meet the standard card components through the cost prices of various materials entered in the secondary system for feeding;

[0070] The calculation program and solution program of the component control structure model are saved in the form of a database according to the material composition from different sources and can be called at any time.

[0071] The module for precise alloy addition calculates the absorption rates of alloys and core wires, develops a corresponding table of alloy and core wire absorption rates for different deoxidation methods (silicon deoxidation, aluminum deoxidation), and maintains it in the secondary system. It calculates the amount of material added based on information such as the composition of the molten steel, automatically unloads the material through the high-level silo, starts the weighing system, and after weighing is completed, automatically starts the transport belt and other equipment to unload the material.

[0072] The optimization of the temperature model is achieved through two aspects: the design of temperature compensation for auxiliary material input during heating and the increase of radiation heat dissipation of the ladle.

[0073] The automatic bottom blowing model automatically controls the argon gas at different stages: during power supply heating: 300-400NL / min, during alloying: 400-500NL / min, during carburization and desulfurization: 800-900NL / min, during wire feeding: 80-100NL / min, and during soft blowing: 60-100NL / min.

[0074] Data communication interface: including data communication with MES and communication with PLC. The secondary system receives MES production instructions, specifications and other related information, and performs orderly operations according to the instructions of MES. After completion, it uploads production performance data to MES; reads PLC production status in real time, and sends secondary settings to the PLC system through model calculation and background logic decision-making to organize automatic refining production.

[0075] Model control is mainly divided into temperature model and composition model. Temperature model: During the production process, the temperature model pre-calculates the dynamic temperature and sends the calculated data to the PLC at the right time; Composition model: According to the steel type and refining data, as well as the inspection and testing data, the amount of material to be added for refining is calculated to ensure the composition requirements of the steel type.

[0076] Production information management, the system process tracks and records all events, and manages every process of the furnace production process. The refining production process can be reproduced through historical records, log files, screen curves and other functions. Example 1

[0077] like Figure 1 , receive production instructions, specifications and other related information through socket communication, and upload the production process information and production performance information of each furnace to the 2.5-level system; communicate with the PLC system through OPC using DDE; the secondary system communicates internally through message queues and shared memory, and the database uses SqlServer2014; the front-end and back-end are separated, and communicate through sockets. Each HMI corresponds to a host program.

[0078] The main block diagram of the component control structure model calculation program and solution program is as follows Figure 2 The material components from different sources are stored in the form of a database and can be called up at any time.

[0079] like Figure 3 According to the law of conservation of energy, the required heat is calculated through specific heat, molten steel volume, temperature required for heating, etc. The material loss heat is optimized through parameter adjustment, and the calculation of bottom blowing Ar gas loss heat is added.

[0080] Embodiment 2

[0081] like Figure 4, the following formula is used to calculate the heat dissipation of the steel ladle wall, where ρ a , ρ b , c a , c b , μa, μb are the density, specific heat capacity and thermal conductivity of two different refractory materials respectively.

[0082] The specific calculation formula is:

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A smelting method for LF refining furnace, characterized in that The following steps are involved: (1) Process design, building process control module, data communication module and HMI screen design module; (2) Automatic feeding model design: according to the steel type and refining data, as well as the inspection and testing data, calculate the amount of material needed to be added for refining to ensure the composition requirements of the steel type, formulate the lowest cost feeding plan, design the alloy material calculation logic, and control the precise addition of alloy materials; (3) Establish a temperature model, pre-calculate the dynamic temperature, and send the calculated data to the PLC at the right time to compensate for the temperature of the auxiliary materials during the heating process and increase the radiation heat dissipation of the ladle wall; (4) Establish an automatic bottom blowing model to control argon gas in different stages.

2. A smelting method for LF refining furnace according to claim 1, characterized in that: In step (1), building the HMI screen design module includes the following five aspects: (a) After the furnace number is taken over in the plan, the steel car with the argon tube connected to the station arrives at the refining position, click on the refining start on the secondary screen, and the amount of auxiliary materials added will be automatically calculated and sent to the primary shell breaking and auxiliary material input instructions; (b) After the shell is broken, the temperature is measured manually. After the temperature measurement data is collected, the power supply time is calculated and slag melting begins. The three refining processes cannot be powered at the same time. The power supply information of the three refining processes needs to be collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate; (c) After the slag-making stage, the desulfurization stage begins. If the desulfurization stirring time, flow rate and al weight are not calculated, the default configuration data is used; (d) After the desulfurization stage is completed, the temperature is measured and sampled for oxygen determination. After the temperature measurement data is collected, the temperature rise stage can be circulated, the time for feeding is calculated, and the temperature rise begins. The three refineries cannot be powered at the same time. The power supply information of the three refineries is collected online. Power can only be supplied when conditions are met. When power cannot be supplied, the argon gas is maintained at the default flow rate in the temperature rise stage; (e) When the ingredients arrive, they are automatically mixed according to the calculation. They are added directly during the power-on process. The argon is maintained at the flow rate in the heating stage. After the power-on is completed, the argon is adjusted to the stirring flow rate and then adjusted to the default flow rate after the stirring time is completed. The materials are added for feeding. If the sulfur does not meet the requirements, the desulfurization stirring time is calculated and the stirring is continued. After the stirring is completed, the flow rate becomes the default flow rate for the alloying stage. If the ingredients meet the requirements, the length of the calcium treatment calcium line is calculated. If the calculation does not require a calcium line, the soft blowing stage is entered.

3. A smelting method for LF refining furnace according to claim 2, characterized in that: In the step (e), the ingredients directly added during the power supply process do not include a recarburizer.

4. A smelting method for LF refining furnace according to claim 1, characterized in that: In the step (2), the lowest cost feeding scheme calculates the material with the lowest price that reaches the standard card components through the cost prices of various materials entered into the secondary system for feeding.

5. A smelting method for LF refining furnace according to claim 1, characterized in that: In the step (2), the alloy material calculation logic is designed, and the material composition from different sources is saved in the form of a database through the composition control structure model calculation program and the solution program, which can be called at any time.

6. A smelting method for LF refining furnace according to claim 1, characterized in that: In the step (2), the alloy material is accurately added through statistical calculation of the absorption rate of the alloy and the core wire, and a corresponding table of the absorption rate of the alloy and the core wire is formulated for different deoxidation methods and maintained in the secondary system. The amount of material added is calculated according to the molten steel composition information, and the material is automatically unloaded through the high-level silo, and the weighing system is started. After the weighing is completed, the conveyor belt equipment is automatically started to unload the material; the deoxidation method includes silicon deoxidation and aluminum deoxidation.

7. A smelting method for LF refining furnace according to claim 1, characterized in that: In the step (3), the formula for calculating the heat dissipation by radiation from the ladle wall is as follows: where ρ a , b 、c a 、c b , μa and μb are the density, specific heat capacity and thermal conductivity of two different refractory materials respectively.

8. A smelting method for LF refining furnace according to claim 1, characterized in that: In the step (4), during the power supply heating stage, the argon blowing is controlled at 300-400 NL / min; during the alloying stage, the argon blowing is controlled at 400-500 NL / min; during the carburizing and desulfurization stage, the argon blowing is controlled at 800-900 NL / min; During the wire feeding stage, the argon blowing rate is controlled at 80-100 NL / min; During the soft blowing stage, the argon blowing rate is controlled at 60-100NL / min.

9. A smelting method for LF refining furnace according to claim 1, characterized in that: It is also equipped with a data communication interface for data communication with MES and PLC. The secondary system receives MES production instructions and specification-related information, and performs orderly operations according to the instructions of MES. After completion, it uploads the actual production performance data to MES. Read the PLC production status in real time, send the secondary settings to the PLC system through model calculation and background logic decision-making, and organize automatic refining production.

10. A smelting method for LF refining furnace according to claim 1, characterized in that: It also includes production information management. The system process tracks and records all events, manages each process of the furnace production process, and reproduces the refining production process through historical records, log files and screen curve functions.

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