Converter low-silicon smelting method

Abstract

The invention relates to the field of low-silicon smelting, and discloses a converter low-silicon smelting method which comprises the following steps: S10, raw material preparation: crushing high-silicon iron ore, and simultaneously preparing limestone and coke as a reducing agent and a flux; s20, preheating and impurity removal, wherein the high-silicon iron ore, the reducing agent and the solvent are preheated in a converter, and the temperature in the converter is increased; s30, heating and smelting, wherein the temperature in the converter is increased, and the crushed high-silicon iron ore is refined to be in a metal solution state with the help of limestone; s40, slag separation, wherein fuel and pure oxygen are injected into the converter, and silicon in the metal solution is oxidized and separated to form slag after the temperature in the converter is increased; and S50, hardening and tempering the solution: reducing the injection amount of fuel and pure oxygen, adjusting the temperature in the converter, and then adding corresponding parts of manganese powder. Through the operations of gradually reducing the fuel and oxygen injection amount, controlling the temperature in the converter and the like, the smelting process can be optimized, the energy utilization efficiency can be improved, the energy consumption can be reduced, the waste gas emission can be reduced, and the purposes of energy conservation and emission reduction can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of low-silicon smelting, and in particular to a converter low-silicon smelting method. Background Art

[0002] In the traditional smelting process, the converter low-silicon smelting method is a common process route for producing metal products with low silicon content. This method usually involves passing high-silicon ore through a converter smelting process to reduce the silicon content and improve the quality and purity of the product.

[0003] However, the traditional converter low-silicon smelting method has serious problems, among which low energy efficiency is a major challenge. In the traditional process, the injection control of fuel and oxygen is not precise enough, resulting in serious energy waste. This inefficiency not only increases production costs, but also affects the environment.

[0004] The increase in waste gas emissions is also a prominent problem. Due to the inadequate waste gas treatment in the traditional smelting process, a large amount of harmful gases and particulate matter are emitted into the atmosphere, causing serious environmental pollution. This environmental pollution not only affects the air quality of the surrounding areas, but also causes long-term harm to human health and the ecosystem.

[0005] To this end, those skilled in the art provide a converter low-silicon smelting method to solve the problems raised in the above background technology. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a converter low-silicon smelting method, which solves the existing problems of serious energy consumption and serious environmental pollution.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A converter low-silicon smelting method, comprising the following steps:

[0008] S10, raw material preparation: crush high silicon iron ore, and prepare limestone and coke as reducing agent and flux;

[0009] S20, preheating and impurity removal: preheating high silicon iron ore, reducing agent and solvent in the converter and increasing the temperature in the furnace;

[0010] S30, heating and smelting: raising the temperature in the converter, limestone helps to crush high silicon iron ore and refine it into a metal solution;

[0011] S40, separating slag: injecting fuel and pure oxygen into the converter to increase the temperature inside the converter and then oxidize and separate silicon in the metal solution to form slag;

[0012] S50, solution conditioning: reduce the amount of fuel and pure oxygen injected, adjust the temperature inside the converter, add a corresponding amount of manganese powder, and gradually increase the amount of fuel and pure oxygen injected after adding, and increase the temperature inside the converter;

[0013] S60, argon purging: argon gas is introduced from the bottom of the converter to purge the molten steel in the converter;

[0014] S70, continuous casting: The molten steel in the converter is continuously cast through a continuous casting machine.

[0015] Preferably, a jaw crusher is used to repeatedly crush the high silicon iron ore, and the crushing time is set to 17 minutes to 25 minutes. The particle size of the high silicon iron ore after crushing is 9 mm to 14 mm.

[0016] Preferably, in step S20, the preheating temperature in the rotating wheel is set to 800°C to 1200°C.

[0017] Preferably, the temperature in step S30 is raised in the range of 1000° C. to 1500° C., and the chemical reaction formula of the limestone and the crushed high-silicon iron ore is:

[0018] CaCO3+SiO2→CaSiO3+CO2;

[0019] Among them, CaCO3 is limestone, SiO2 is high-silicon iron ore, CaSiO3 is limestone slag, and CO2 is carbon dioxide.

[0020] Preferably, in the step S40, the chemical reaction formula for silicon and pure oxygen is:

[0021] (Si+O 2 →SiO 2 );

[0022] According to the above reaction formula, the required amount for the oxidation reaction can be obtained: 1 mol of silicon requires 1 mol of oxygen to be oxidized into silicon dioxide, where 1 mol of silicon is 20g to 28g and 1 mol of oxygen is 30g to 35g.

[0023] Preferably, the calculation formula for the amount of manganese powder added in step S50 is:

[0024]

[0025] Among them, W 锰粉末 is the amount of manganese powder to be added (unit: kg), W 合金 is the total amount of the final alloy (unit: kg).

[0026] Preferably, after the injection amount of fuel and pure oxygen is reduced in step S50, the temperature inside the converter is 800°C to 1000°C, and after the injection amount of fuel and pure oxygen is increased in step S50, the temperature inside the converter is 900°C to 1050°C.

[0027] Preferably, in the step S60, the argon gas is introduced to purge the molten steel for a time period of 10 minutes to 35 minutes.

[0028] Preferably, in step S70, the crystallizer temperature in the continuous casting machine is set to 1100°C to 1400°C.

[0029] Preferably, in step S60, the chemical equation of argon and oxygen is:

[0030] 2Ar+O2→2ArO;

[0031] Argon (Ar) reacts with oxygen (O2) to generate oxide (ArO), which is slag.

[0032] The present invention provides a converter low-silicon smelting method. It has the following beneficial effects:

[0033] 1. The present invention can optimize the smelting process, improve energy utilization efficiency, reduce energy consumption, reduce waste gas emissions, and achieve the goal of energy conservation and emission reduction by gradually reducing the amount of fuel and oxygen injected and controlling the temperature in the converter.

[0034] 2. The present invention helps to improve production efficiency by using a hammer crusher to crush high-silicon iron ore, setting appropriate crushing time and particle size, and setting preheating temperature and high-temperature refining temperature in the converter. The setting of ore crushing particle size and preheating temperature can accelerate the smelting process and shorten the production cycle.

[0035] 3. The present invention helps to improve the purity and quality of metal products, reduce impurity content, and ensure that the products meet technical requirements by using limestone to help crush high-silicon iron ore and refine it into a metal solution state, controlling the amount of fuel and pure oxygen injected, adding manganese powder for tempering, and argon purging. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a process step diagram of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0040] Example

[0041] Please refer to the attached Figure 1 ,

[0042] A converter low-silicon smelting method comprises the following steps:

[0043] S10, raw material preparation: crush the high silicon iron ore, and prepare limestone and coke as reducing agent and flux; in step S10, a jaw crusher is used to repeatedly crush the high silicon iron ore, and the crushing time is set to 17min to 25min. The particle size of the crushed high silicon iron ore is 9mm to 14mm.

[0044] In this step, the high silicon iron ore is crushed, and limestone and coke are prepared as reducing agents and fluxes. The high silicon iron ore is repeatedly crushed by a jaw crusher, and the crushing time is 17 minutes to 25 minutes, so that the particle size of the high silicon iron ore is in the range of 9mm to 14mm. Such crushing operation helps to increase the surface area of ​​the ore and promote the subsequent smelting reaction.

[0045] S20, preheating and impurity removal: preheating high silicon iron ore, reducing agent and solvent in the converter and increasing the temperature in the furnace; in step S20, the preheating temperature in the rotor is set to 800°C to 1200°C.

[0046] In this stage, the high silicon iron ore, reducing agent and flux in the converter are preheated and the temperature in the furnace is increased. The preheating temperature is set between 800℃ and 1200℃, which helps to reduce energy loss during the smelting process and provide the necessary heat and conditions for subsequent smelting reactions.

[0047] S30, heating and smelting: raising the temperature in the converter, limestone helps the crushed high silicon iron ore to be refined into a metal solution; the temperature in step S30 is raised in the range of 1000°C to 1500°C, and the chemical reaction formula of limestone and crushed high silicon iron ore is:

[0048] CaCO3+SiO2→CaSiO3+CO2;

[0049] Among them, CaCO3 is limestone, SiO2 is high-silicon iron ore, CaSiO3 is limestone slag, and CO2 is carbon dioxide.

[0050] In this step, the temperature in the converter gradually increases, and the addition of limestone helps to refine the high-silicon iron ore into a metal solution. The temperature rise range is between 1000℃ and 1500℃, and the chemical reaction between limestone and high-silicon iron ore helps to lower the melting point of the ore and promote the melting of the metal, thus realizing the smelting process.

[0051] S40, separation of slag: injecting fuel and pure oxygen into the converter, increasing the temperature inside the converter, and oxidizing and separating silicon in the metal solution to form slag; in step S40, the chemical reaction formula for silicon and pure oxygen is:

[0052] (Si+O 2 →SiO 2 );

[0053] According to the above reaction formula, the required amount for the oxidation reaction can be obtained: 1 mol of silicon requires 1 mol of oxygen to be oxidized into silicon dioxide, where 1 mol of silicon is 20g to 28g and 1 mol of oxygen is 30g to 35g.

[0054] In this stage, fuel and pure oxygen are injected to separate silicon from the metal solution to form slag. According to the chemical reaction formula, silicon reacts with oxygen to form silicon dioxide, and an appropriate amount of oxygen is required to complete the reaction. Controlling the amount of oxygen injected and the reaction conditions helps to effectively separate the slag and improve smelting efficiency.

[0055] S50, solution conditioning: reduce the amount of fuel and pure oxygen injected, adjust the temperature inside the converter, and then add a corresponding amount of manganese powder, and gradually increase the amount of fuel and pure oxygen injected after adding, and increase the temperature inside the converter; the calculation formula for the amount of manganese powder added in step S50 is:

[0056]

[0057] Among them, W 锰粉末 is the amount of manganese powder to be added (unit: kg), W 合金 The total amount of the final alloy (unit: kg). After the fuel and pure oxygen injection amount is reduced in step S50, the temperature inside the converter is 800°C to 1000°C. After the fuel and pure oxygen injection amount is increased in step S50, the temperature inside the converter is 900°C to 1050°C.

[0058] In this step, adjusting the injection amount of fuel and oxygen, adding an appropriate amount of manganese powder, and adjusting the temperature in the converter will help improve the quality of the alloy. The amount of manganese powder added is calculated based on the total amount of alloy, and gradually increasing the injection amount of fuel and oxygen, and controlling the temperature in the converter between 800℃ and 1050℃, will help adjust the alloy composition and performance.

[0059] S60, argon purging: argon gas is introduced from the bottom of the converter to purge the molten steel in the converter; in step S60, the argon gas purge time for the molten steel is guaranteed to be 10 minutes to 35 minutes. In step S60, the chemical equation of argon and oxygen is:

[0060] 2Ar+O2→2ArO;

[0061] Argon (Ar) reacts with oxygen (O2) to generate oxide (ArO), which is slag.

[0062] In this step, argon is used to purge the molten steel in the converter, which helps to remove oxides and other impurities in the molten steel. The reaction of argon and oxygen produces oxides, which are slags. Maintaining an appropriate purge time helps improve the quality of the molten steel.

[0063] S70, continuous casting: the molten steel in the converter is continuously cast through a continuous casting machine. In step S70, the crystallizer temperature in the continuous casting machine is set to 1100°C to 1400°C.

[0064] The last step is to continuously cast the molten steel in the converter through a continuous casting machine. The crystallizer temperature is set between 1100℃ and 1400℃, which helps control the solidification process of the molten steel and ensure the quality and shape of the final product.

[0065] The following are specific embodiments of the present invention:

[0066] Embodiment 1:

[0067] step:

[0068] S10: Use a jaw crusher to repeatedly crush the high silicon iron ore, set the crushing time to 20 minutes, and the particle size of the high silicon iron ore after crushing is 12mm. In this step, a jaw crusher is used to repeatedly crush the high silicon iron ore, and the crushing time is set to 20 minutes. The particle size of the high silicon iron ore after crushing is 12mm. The jaw crusher crushes the ore into the required particle size through extrusion and shearing, which increases the surface area of ​​the ore and is conducive to the subsequent smelting reaction.

[0069] S20: The preheating temperature in the converter is set to 1000°C. In this stage, the preheating temperature in the converter is set to 1000°C. Preheating helps to reduce energy loss during the smelting process, while providing the necessary heat for subsequent smelting reactions, so that the raw materials reach a temperature more suitable for smelting.

[0070] S30: Raise the temperature in the converter to 1300°C, and limestone helps to crush the high-silicon iron ore and refine it into a metal solution. In this step, the temperature in the converter is raised to 1300°C, and the addition of limestone helps to refine the high-silicon iron ore into a metal solution. The chemical reaction between limestone and high-silicon iron ore helps to promote the melting and separation of metals, improve smelting efficiency and product quality.

[0071] S40: Fuel and pure oxygen are injected into the converter to separate silicon oxides and form slag. In this stage, fuel and pure oxygen are injected to separate silicon oxides and form slag. This helps to effectively separate the slag and improve the purity and quality of the metal solution. Controlling the oxygen injection amount and reaction conditions is the key to ensuring effective separation.

[0072] S50: Reduce the amount of fuel and pure oxygen injected, add a corresponding amount of manganese powder, gradually increase the amount of fuel and pure oxygen injected, and increase the temperature in the converter. In this step, reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, gradually increase the amount of fuel and pure oxygen injected, and increase the temperature in the converter. This helps to adjust the alloy composition and properties and improve the quality and strength of the alloy.

[0073] S60: Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter. The purge time is guaranteed to be 25 minutes. By introducing argon gas from the bottom of the converter to purge the molten steel in the converter, it is helpful to remove oxides and other impurities in the molten steel and improve the quality and purity of the molten steel. Maintaining an appropriate purge time helps to ensure the quality of the molten steel.

[0074] S70: The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1200°C. The last step is to continuously cast the molten steel in the converter through a continuous casting machine, and the crystallizer temperature is set to 1200°C. This helps control the solidification process of the molten steel, ensure the quality and shape of the final product, and improve production efficiency and product quality.

[0075] Summary: This embodiment achieves an efficient low-silicon smelting process by precisely controlling the crushing time, preheating temperature, manganese powder addition amount and argon purge time.

[0076] Embodiment 2:

[0077] step:

[0078] S10: Use a hammer crusher to crush the high silicon iron ore, set the crushing time to 17 minutes, and the particle size of the high silicon iron ore after crushing is 9mm. In this step, a hammer crusher is used to crush the high silicon iron ore, set the crushing time to 17 minutes, and the particle size of the high silicon iron ore after crushing is 9mm. The hammer crusher impacts and crushes the ore with a high-speed rotating hammer head, crushing the ore into the required particle size, increasing the surface area, which is conducive to the reaction in the subsequent smelting process.

[0079] S20: The preheating temperature in the converter is set to 800°C. In this stage, the preheating temperature in the converter is set to 800°C. Preheating helps to raise the temperature of the raw materials to a suitable smelting temperature in advance, reduce energy loss during the smelting process, and prepare for subsequent smelting reactions.

[0080] S30: Raise the temperature in the converter to 1400℃, and limestone helps to crush high-silicon iron ore and refine it into a metal solution. Raise the temperature in the converter to 1400℃, and the addition of limestone helps to refine high-silicon iron ore into a metal solution. The chemical reaction between limestone and high-silicon iron ore is conducive to promoting the melting and separation of metals, improving smelting efficiency and product quality.

[0081] S40: Fuel and pure oxygen are injected into the converter to separate silicon oxides and form slag. In this stage, fuel and pure oxygen are injected to separate silicon oxides and form slag. This helps to effectively separate the slag and improve the purity and quality of the metal solution. Controlling the oxygen injection amount and reaction conditions is the key to ensuring effective separation.

[0082] S50: Reduce the amount of fuel and pure oxygen injected, add a corresponding amount of manganese powder, gradually increase the amount of fuel and pure oxygen injected, and increase the temperature in the converter. Reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, gradually increase the amount of fuel and pure oxygen injected, and increase the temperature in the converter. This helps to adjust the alloy composition and properties and improve the quality and strength of the alloy.

[0083] S60: Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter. The purge time is guaranteed to be 30 minutes. By introducing argon gas from the bottom of the converter to purge the molten steel in the converter, it is helpful to remove oxides and other impurities in the molten steel and improve the quality and purity of the molten steel. Maintaining an appropriate purge time helps to ensure the quality of the molten steel.

[0084] S70: The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1300°C. The last step is to continuously cast the molten steel in the converter through a continuous casting machine, and the crystallizer temperature is set to 1300°C. This helps control the solidification process of the molten steel, ensure the quality and shape of the final product, and improve production efficiency and product quality.

[0085] Summary: This embodiment optimizes the low-silicon smelting process by setting different crushing methods, preheating temperatures and argon purge times.

[0086] Embodiment three:

[0087] step:

[0088] S10: The high silicon iron ore is crushed by a cone crusher, and the crushing time is set to 25 minutes. The particle size of the high silicon iron ore after crushing is 14mm. The high silicon iron ore is crushed by a cone crusher, and the crushing time is set to 25 minutes. The particle size of the high silicon iron ore after crushing is 14mm. The cone crusher crushes and breaks the ore to the required particle size through the conical crushing chamber and the rotational movement of the eccentric shaft. This helps to increase the surface area of ​​the ore and improve the reaction rate and efficiency in the subsequent smelting process.

[0089] S20: The preheating temperature in the converter is set to 1100°C. The preheating temperature in the converter is set to 1100°C. The preheating process helps to quickly heat the raw materials to a suitable smelting temperature, reduce energy loss during the smelting process, improve energy utilization efficiency, shorten the smelting cycle, and prepare for subsequent high-temperature smelting.

[0090] S30: Raise the temperature in the converter to 1500℃, and limestone helps to crush high-silicon iron ore and refine it into a metal solution. Raise the temperature in the converter to 1500℃, and the addition of limestone helps to refine high-silicon iron ore and convert it into a metal solution. The reaction of limestone and high-silicon iron ore is conducive to the melting and separation of metals, promotes the metal refining process, and improves smelting efficiency and product quality.

[0091] S40: Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag. Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag through redox reactions. This step helps to effectively separate the slag, improve the purity and quality of the metal solution, and ensure that the quality of the final product meets the requirements.

[0092] S50: Reduce the amount of fuel and pure oxygen injected, add a corresponding amount of manganese powder, gradually increase the amount of fuel and pure oxygen injected, and increase the temperature in the converter. Reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, and gradually increase the amount of fuel and pure oxygen injected to quench and temper the alloy. The addition of manganese powder helps to adjust the composition and properties of the alloy, improve the quality, strength and wear resistance of the alloy, and ensure that the product meets the specified technical requirements.

[0093] S60: Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter. The purge time is guaranteed to be 35 minutes. Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter. The purge time is guaranteed to be 35 minutes. Argon gas purge helps to remove oxides and other impurities in the molten steel, reduce bubbles and inclusions, improve the quality and purity of the molten steel, and ensure that the quality of the final product meets the standards.

[0094] S70: The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1400°C. The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1400°C. The continuous casting process helps control the solidification process of the molten steel, ensure that the shape and size of the billet meet the requirements, improve production efficiency and product quality, and meet market demand.

[0095] Summary: This embodiment optimizes the low-silicon smelting process by selecting different crushing equipment, preheating temperature and argon purge time.

[0096] Embodiment 4:

[0097] step:

[0098] S10: Use a roller crusher to crush high silicon iron ore, set the crushing time to 15 minutes, and the particle size of the high silicon iron ore after crushing is 10mm. Use a roller crusher to crush high silicon iron ore, set the crushing time to 15 minutes, and the particle size of the high silicon iron ore after crushing is 10mm. The roller crusher uses the rotation of the roller shaft to squeeze and crush the ore to the required particle size. This helps to increase the surface area of ​​the ore, promote heat conduction and reaction rate in the subsequent smelting process, and improve smelting efficiency.

[0099] S20: The preheating temperature in the converter is set to 900°C. The preheating temperature in the converter is set to 900°C. The preheating process helps to quickly heat the raw materials to a suitable smelting temperature, reduce energy loss, improve energy utilization efficiency, shorten the smelting cycle, and prepare for subsequent high-temperature smelting.

[0100] S30: Raise the temperature in the converter to 1350℃, and limestone helps to crush high-silicon iron ore and refine it into a metal solution. Raise the temperature in the converter to 1350℃, and the addition of limestone helps to refine high-silicon iron ore and convert it into a metal solution. The reaction of limestone and high-silicon iron ore is conducive to the melting and separation of metals, promotes the metal refining process, and improves smelting efficiency and product quality.

[0101] S40: Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag. Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag through redox reactions. This step helps to effectively separate the slag, improve the purity and quality of the metal solution, and ensure that the quality of the final product meets the requirements.

[0102] S50: Gradually reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, control the amount of fuel and pure oxygen injected, and maintain a suitable temperature in the converter. Gradually reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, control the amount of fuel and pure oxygen injected, and maintain a suitable temperature in the converter. The addition of manganese powder helps to adjust the composition and properties of the alloy, improve the quality, strength and wear resistance of the alloy, and ensure that the product meets the specified technical requirements.

[0103] S60: Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter, and the purge time is maintained at 28 minutes. Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter, and the purge time is maintained at 28 minutes. Argon gas purge helps to remove oxides and other impurities in the molten steel, reduce bubbles and inclusions, improve the quality and purity of the molten steel, and ensure that the quality of the final product meets the standards.

[0104] S70: The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1250°C. The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1250°C. The continuous casting process helps control the solidification process of the molten steel, ensure that the shape and size of the billet meet the requirements, improve production efficiency and product quality, and meet market demand.

[0105] Summary: This embodiment achieves an efficient low-silicon smelting process through the use of a roll crusher, proper preheating temperature control and adjustment of argon purge time.

[0106] Embodiment five:

[0107] step:

[0108] S10: Use hammer crusher to crush high silicon iron ore, set the crushing time to 20 minutes, and the particle size of high silicon iron ore after crushing is 11mm. Use hammer crusher to crush high silicon iron ore, set the crushing time to 20 minutes, and the particle size of high silicon iron ore after crushing is 11mm. The hammer crusher uses high-speed rotating hammers to impact and crush the ore to the required particle size. This crushing method can effectively crush ores with higher hardness, increase the surface area of ​​the ore, and is beneficial to the subsequent smelting process.

[0109] S20: The preheating temperature in the converter is set to 950°C. The preheating temperature in the converter is set to 950°C. The preheating process helps to quickly heat the raw materials to a suitable smelting temperature, reduce energy loss, improve energy utilization efficiency, shorten the smelting cycle, and prepare for subsequent high-temperature smelting.

[0110] S30: Raise the temperature in the converter to 1400℃, and limestone helps to crush high-silicon iron ore and refine it into a metal solution. Raise the temperature in the converter to 1400℃, and the addition of limestone helps to refine high-silicon iron ore and convert it into a metal solution. The reaction of limestone and high-silicon iron ore is conducive to the melting and separation of metals, promotes the metal refining process, and improves smelting efficiency and product quality.

[0111] S40: Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag. Inject fuel and pure oxygen into the converter to separate silicon oxides to form slag through redox reactions. This step helps to effectively separate the slag, improve the purity and quality of the metal solution, and ensure that the quality of the final product meets the requirements.

[0112] S50: Gradually reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, control the amount of fuel and pure oxygen injected, and maintain a suitable temperature in the converter. Gradually reduce the amount of fuel and pure oxygen injected, add an appropriate amount of manganese powder, control the amount of fuel and pure oxygen injected, and maintain a suitable temperature in the converter. The addition of manganese powder helps to adjust the composition and properties of the alloy, improve the quality, strength and wear resistance of the alloy, and ensure that the product meets the specified technical requirements.

[0113] S60: Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter, and the purge time is kept at 30 minutes. Argon gas is introduced from the bottom of the converter to purge the molten steel in the converter, and the purge time is kept at 30 minutes. Argon gas purge helps to remove oxides and other impurities in the molten steel, reduce bubbles and inclusions, improve the quality and purity of the molten steel, and ensure that the quality of the final product meets the standards.

[0114] S70: The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1300°C. The molten steel in the converter is continuously cast through a continuous casting machine, and the crystallizer temperature is set to 1300°C. The continuous casting process helps control the solidification process of the molten steel, ensure that the shape and size of the billet meet the requirements, improve production efficiency and product quality, and meet market demand.

[0115] Summary: This embodiment optimizes the low-silicon smelting process by using a hammer crusher, setting a suitable preheating temperature, and controlling the argon purge time.

[0116] Summary of the embodiments:

[0117] These five embodiments demonstrate the effects of different crusher types, preheating temperatures, and argon purge times on the low-silicon smelting process. The embodiments using jaw crushers and roller crushers (Examples 1 and 4) differ in crushing time, preheating temperature, and argon purge time, and achieve efficient smelting effects respectively. On the other hand, the embodiments of hammer crushers and cone crushers (Examples 2 and 3) demonstrate the effects of different crushing methods and parameter settings on the smelting effect. Overall, by precisely controlling the crusher type, preheating temperature, and argon purge time, the low-silicon smelting process can be optimized, and the smelting efficiency and product quality can be improved.

[0118] Difference summary table:

[0119]

[0120]

[0121] Comparative experimental design:

[0122] Experiment 1: Effect of different crusher types on smelting efficiency

[0123] Parameter settings:

[0124] Experimental Group A: Roller Crusher

[0125] Experimental Group B: Hammer Crusher

[0126] Test data table:

[0127] Experimental Group Crusher Type Smelting efficiency (%) Product Quality Rating A Roller Crusher 92 9.2 B Hammer crusher 90 9.0

[0128] Summary: Through the use of jaw crusher, longer crushing time and suitable preheating temperature, an efficient smelting process is achieved. Control of argon purge time helps to maintain a stable atmosphere in the converter.

[0129] Experiment 2: Effect of different preheating temperatures on product quality

[0130] Parameter settings:

[0131] Experimental group C: preheating temperature 900℃

[0132] Experimental group D: preheating temperature 950℃

[0133] Test data table:

[0134] Experimental Group Preheating temperature (℃) Smelting efficiency (%) Product Quality Rating C 900 92 9.1 D 950 91 9.3

[0135] Experiment 3: Effect of different manganese powder addition amounts on smelting efficiency

[0136] Parameter settings:

[0137] Experimental group E: low addition (5%)

[0138] Experimental group F: high addition (8%)

[0139] Test data table:

[0140] Experimental Group Manganese powder addition amount (%) Smelting efficiency (%) Product Quality Rating E 5 91 9.0 F 8 93 9.5

[0141] Experimental data summary table:

[0142] Experimental Group Parameter settings Smelting efficiency (%) Product Quality Rating A Roller Crusher 92 9.2 B Hammer crusher 90 9.0 C Preheating temperature 900℃ 92 9.1 D Preheating temperature 950℃ 91 9.3 E Manganese powder addition 5% 91 9.0 F Manganese powder addition amount 8% 93 9.5

[0143] By comparing the experimental data, it can be seen that the roller crusher, appropriate preheating temperature and the addition of an appropriate amount of manganese powder have a significant impact on the improvement of smelting efficiency and product quality, further highlighting the advantages of the converter low-silicon smelting method.

[0144] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A converter low-silicon smelting method, characterized in that: The following steps are involved: S10, raw material preparation: crush high silicon iron ore, and prepare limestone and coke as reducing agent and flux; S20, preheating and impurity removal: preheating high silicon iron ore, reducing agent and solvent in the converter and increasing the temperature in the furnace; S30, heating and smelting: raising the temperature in the converter, limestone helps to crush high silicon iron ore and refine it into a metal solution; S40, separating slag: injecting fuel and pure oxygen into the converter to increase the temperature inside the converter and then oxidize and separate silicon in the metal solution to form slag; S50, solution conditioning: reduce the amount of fuel and pure oxygen injected, adjust the temperature inside the converter, add a corresponding amount of manganese powder, and gradually increase the amount of fuel and pure oxygen injected after adding, and increase the temperature inside the converter; S60, argon purging: argon gas is introduced from the bottom of the converter to purge the molten steel in the converter; S70, continuous casting: The molten steel in the converter is continuously cast through a continuous casting machine.

2. A converter low-silicon smelting method according to claim 1, characterized in that: In the step S10, a jaw crusher is used to repeatedly crush the high silicon iron ore, and the crushing time is set to 17 minutes to 25 minutes. The particle size of the crushed high silicon iron ore is 9 mm to 14 mm.

3. The converter low-silicon smelting method according to claim 1, characterized in that: In the step S20, the preheating temperature in the rotor is set to 800°C to 1200°C.

4. The converter low-silicon smelting method according to claim 1, characterized in that: The temperature in step S30 is raised in the range of 1000°C to 1500°C, and the chemical reaction formula of the limestone and the crushed high-silicon iron ore is: CaCO3+SiO2→CaSiO3+CO2; Among them, CaCo3 is limestone, SiO2 is high-silicon iron ore, CaSiO3 is limestone slag, and CO2 is carbon dioxide.

5. The converter low-silicon smelting method according to claim 1, characterized in that: In the step S40, the chemical reaction formula for silicon and pure oxygen is: (Si+O2→SiO2); According to the above reaction formula, the required amount for the oxidation reaction can be obtained: 1 mol of silicon requires 1 mol of oxygen to be oxidized into silicon dioxide, where 1 mol of silicon is 20g to 28g and 1 mol of oxygen is 30g to 35g.

6. The converter low-silicon smelting method according to claim 1, characterized in that: The calculation formula for the amount of manganese powder added in step S50 is: Among them, W 锰粉末 is the amount of manganese powder to be added (unit: kg), W 合金 is the total amount of the final alloy (unit: kg).

7. The converter low-silicon smelting method according to claim 1, characterized in that: After the injection amount of fuel and pure oxygen is reduced in step S50, the temperature inside the converter is 800°C to 1000°C. After the injection amount of fuel and pure oxygen is increased in step S50, the temperature inside the converter is 900°C to 1050°C.

8. The converter low-silicon smelting method according to claim 1, characterized in that: In the step S60, argon gas is introduced to purge the molten steel for a time period of 10 minutes to 35 minutes.

9. The converter low-silicon smelting method according to claim 1, characterized in that: In the step S70, the crystallizer temperature in the continuous casting machine is set to 1100°C to 1400°C.

10. The converter low-silicon smelting method according to claim 1, characterized in that: In the step S60, the chemical equation of argon and oxygen is: 2Ar+O2→2ArO; Argon (Ar) reacts with oxygen (O2) to generate oxide (ArO), which is slag.

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