Rapid converter slagging method based on high-alkalinity casting residues

Abstract

The invention discloses a rapid converter slagging method based on high-alkalinity casting residues, which specifically comprises the following steps: (1) before the beginning of converter smelting, calculating the required high-alkalinity casting residue adding amount based on heat charging information so as to control the content of AlO in early-stage slag as a target mass fraction; (2) after converter loading is completed, high-alkalinity casting residues accounting for 40-60% of the required high-alkalinity casting residues and lime are synchronously added into the converter before blowing; and (3) when the smelting duration reaches 3-5 min, the remaining high-alkalinity casting residues with the needed high-alkalinity casting residue adding amount are put into the furnace. The feeding amount of the high-alkalinity casting residues is calculated based on converter loading information, a batch feeding strategy is adopted, the residues rapidly enter a liquid phase at the initial stage of blowing, a high-alkalinity and high-fluidity slag system is formed, and therefore the slagging and dephosphorizing efficiency is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of converter steelmaking technology, and more specifically, this invention relates to a rapid slag formation method for converters based on high-basicity foundry residue slag. Background Technology

[0002] In converter steelmaking, the slag-forming system is crucial for ensuring smooth smelting and achieving final composition control. During blowing, oxygen reacts with carbon, silicon, manganese, phosphorus, and other elements in the molten iron, producing oxides that combine with fluxes such as lime and dolomite to form slag. A proper slag-forming system should rapidly generate a liquid slag system in the early stages of blowing to encapsulate and fix the oxidation products, and provide thermodynamic and kinetic conditions for dephosphorization, desulfurization, and inclusion removal by regulating basicity and oxidizing properties. Typically, lime is used as the main slag-forming material to increase basicity and promote phosphorus incorporation into the slag; dolomite supplements MgO to stabilize the furnace lining. However, in actual production, converters generally face problems such as slow slag formation in the early stages and low lime melting rates, resulting in insufficient dephosphorization reaction motive force. Delayed slag system formation leads to large fluctuations in early slag composition, making it difficult to maintain stable high basicity and reasonable viscosity, directly affecting dephosphorization efficiency and smelting process stability. Therefore, how to rapidly form a high-basicity liquid slag system in the early stages of converter blowing is a key issue for optimizing the slag-forming system and improving smelting quality and process stability.

[0003] To address insufficient slag formation in the early stages of converter production, a certain amount of flux is typically added. Common fluxes include fluorite, sinter, and pre-melted slag. Fluorite significantly reduces slag viscosity and improves fluidity, but its high fluorine content easily releases fluoride gases at high temperatures, corroding the furnace lining and causing serious environmental problems. Sinter, as an iron-containing flux, can supplement the iron source and accelerate lime melting, but its excessive reactivity often leads to molten iron splashing and slag overflow, affecting operational safety. Pre-melted slag, while having a stable composition, is costly and difficult to promote on a large scale. Therefore, existing fluxes struggle to simultaneously meet the demands of rapid slag formation, smelting stability, and economic and environmental requirements.

[0004] Compared to traditional fluxes, high-basicity foundry slag has natural advantages. High-basicity foundry slag is the residual slag after ladle casting, primarily composed of CaO and... Primarily composed of high-basicity foundry slag, with an alkalinity generally above 5, under converter blowing temperatures, high-basicity foundry slag can rapidly enter the liquid phase. This not only compensates for the slow melting of lime but also significantly improves slag fluidity and accelerates slag formation. Currently, the application of high-basicity foundry slag in converters still has the following shortcomings: 1) Lack of understanding of the slag system... Scientific control of content can easily lead to... Excessive content leads to excessively low slag viscosity and difficulty in slag-iron separation, or 1) The content is too low, resulting in poor fluxing and dephosphorization effects; 2) The timing of addition is not controlled properly. It is usually added at once or at random, which makes it difficult to match the blowing rhythm and causes the slag reaction to become unbalanced. Summary of the Invention

[0005] This invention provides a rapid slag formation and dephosphorization method for converters based on high-basicity foundry residue, aiming to solve at least one of the above-mentioned problems.

[0006] This invention is implemented as follows: a rapid slag formation method for converters based on high-basicity foundry residue slag, characterized in that the method is specifically as follows:

[0007] (1) Before the start of converter smelting, calculate the required amount of high basicity foundry slag to be added based on the furnace charge information, so as to control the amount of high basicity foundry slag in the early stage. The content is the target mass fraction;

[0008] (2) After the converter is loaded, before the blowing starts, add 40% to 60% of the required amount of high-basicity foundry residue and lime into the furnace simultaneously.

[0009] (3) When the smelting time reaches 3 min to 5 min, add the remaining amount of high basicity casting residue into the furnace.

[0010] Furthermore, in the early stage of slag The specific method for determining the target quality score is as follows:

[0011] (11) Detect the slag sampled from the current furnace. The mass fraction was determined, and the liquidus temperature of the sample slag was tested to maintain the concentration in subsequent batches of slag. The quality fraction remains unchanged, and the detection is currently... Furnace lining erosion thickness at mass fraction;

[0012] (12) Change the slag in the next batch Quality score, proceed to step (11);

[0013] (13) The slag obtained through steps (11) to (12) above is in different Liquidity temperature and furnace lining erosion thickness at mass fraction;

[0014] (14) Select slag with small lining erosion thickness and low liquidus temperature. Mass fraction as a component of the initial slag The target quality score.

[0015] Furthermore, in the early stage of slag The target quality score is 5%.

[0016] Furthermore, the proportion of high-basicity casting residue added in step (2) is adjusted according to the silicon content of the molten iron. When the silicon content of the molten iron is high, the proportion of high-basicity casting residue added in step (2) is reduced; when the silicon content of the molten iron is low, the proportion of high-basicity casting residue added in step (2) is increased.

[0017] Furthermore, the position of the oxygen lance in step (2) is controlled at 1.9 m–2.1 m.

[0018] Furthermore, in the later stages of smelting, the position of the oxygen lance is controlled at 1.7m~2.0m, and 200~300 kg of lime is added when the smelting time reaches 12min~14min.

[0019] Furthermore, the total slag volume and the amount of high-basicity foundry residue added based on the material balance calculation are determined.

[0020] Furthermore, the total slag volume The calculation formula is as follows:

[0021] ;

[0022] in, Indicates the total slag volume; This indicates the total weight of molten iron in the current furnace batch; This indicates the mass fraction of Si in molten iron. This indicates the mass fraction of Mn in molten iron. Indicates the amount of excipients added; This indicates the amount of slag carried into the converter by the molten iron; This indicates the mass fraction of FeO in the slag.

[0023] Furthermore, the required amount of high-basicity foundry slag added... The specific calculation formula is as follows:

[0024] ;

[0025] in, Indicates the required amount of high-basicity foundry residue to be added; This indicates that molten iron is carried into the converter slag. Quality score; Indicating the slag in the early stage The target quality score, Indicating high basicity foundry residue Quality score.

[0026] This invention calculates the amount of high-basicity casting residue to be added based on converter charging information and adopts a batch feeding strategy to enable the slag to quickly enter the liquid phase in the early stage of blowing, forming a high-basicity, high-fluidity slag system, thereby significantly improving slag formation and dephosphorization efficiency. Attached Figure Description

[0027] Figure 1 The flowchart illustrates a rapid slag formation method for converters based on high-basicity foundry residue, as provided in an embodiment of the present invention. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0029] This invention provides a rapid slag formation method for converters using high-basicity casting residue slag. This method calculates the amount of material to be added based on converter charging information and adopts a batch feeding strategy to enable the slag to quickly enter the liquid phase in the early stage of blowing, forming a high-basicity, high-fluidity slag system, thereby significantly improving slag formation and dephosphorization efficiency.

[0030] Figure 1 The flowchart of the rapid slag formation method for converters based on high-basicity foundry residue provided in this embodiment of the invention is as follows:

[0031] (1) Before the start of converter smelting, based on the furnace charge information, the required amount of high basicity foundry slag to be added is calculated through material balance to control the amount of high basicity foundry slag added in the early stage slag. The content is the target mass fraction;

[0032] In this embodiment of the invention, the smelting process is divided into an early stage, a middle stage, and a late stage. The early stage refers to a smelting time of 1 min to 5 min, the middle stage refers to a smelting time of 6 min to 12 min, and the late stage refers to a smelting time of more than 12 min. The high-basicity casting residue includes the following components by mass percentage:

[0033] CaO: 40–60 wt% 4-12 wt% 15–32 wt%, MgO: 3–9 wt%, FeO: 0.3–1.5 wt%, MnO: 1–5 wt%, with the remainder being other unavoidable impurities.

[0034] because The effect on converter slag viscosity is dual; it is an effective component of high-basicity foundry residue. When the slag contains... When the content is appropriate, It can form a low-melting-point aluminate phase with CaO, expanding the liquid phase region, lowering the melting point, and improving slag fluidity; in the slag When the content is too high, It will enhance the slag The network structure leads to increased structural coupling and viscosity, hindering CaO dissolution and slag-steel mass transfer, which is detrimental to dephosphorization. Therefore, it is necessary to control the network structure during converter smelting. The content is within a reasonable range. In the embodiments of the invention, the initial slag... Target quality score The specific method for determining this is as follows:

[0035] (11) Detect the slag sampled from the current furnace. The mass fraction was determined, and the liquidus temperature (melting point) and fluidity of the sample slag were tested to maintain the slag content in subsequent batches. The quality fraction remains unchanged, and the detection is currently... Furnace lining erosion thickness at mass fraction;

[0036] (12) Change the slag in the next batch Quality score, proceed to step (11);

[0037] (13) The slag obtained through steps (11) to (12) above is in different Liquidity temperature and furnace lining erosion thickness at mass fraction;

[0038] (14) Select slag with small lining erosion thickness and low liquidus temperature. Mass fraction as a component of the initial slag The target quality fraction is determined in the early stage slag. When the content is about 5%, the slag has a low melting point and good fluidity, and is less corrosive to the furnace lining, providing optimal slag system conditions for the early dephosphorization reaction in the converter.

[0039] In this embodiment of the invention, the total slag volume and the amount of high-basicity casting residue added based on the material balance calculation are determined. The amount of high-basicity casting residue added is based on the total slag volume and the target amount in the slag. The content is calculated using the following formula:

[0040] In this embodiment of the invention, the required total slag volume The calculation formula is as follows:

[0041] ;

[0042] in, Total slag volume, in kg; This indicates the total weight of molten iron in the current furnace, in kg; This represents the mass fraction of Si in molten iron, % . This represents the mass fraction of Mn in molten iron, expressed as % . This indicates the amount of auxiliary materials added, which include: lime, dolomite, magnesium balls, and lightly calcined dolomite, in kg; This indicates the amount of slag carried into the converter by the molten iron, in kg; This indicates the mass fraction of FeO in the slag, % .

[0043] The furnace charge information includes: the total weight of molten iron in the current furnace charge. Mass fraction of Si in molten iron Mass fraction of Mn in molten iron Amount of each auxiliary material added The amount of slag carried into the converter by molten iron molten iron carried into the converter slag quality score In the slag Target quality score High alkalinity foundry slag quality score .

[0044] In this embodiment of the invention, the required amount of high-basicity casting residue added... The specific calculation formula is as follows:

[0045] ;

[0046] in, This indicates the required amount of high-basicity foundry residue to be added, in kg; This indicates that molten iron is carried into the converter slag. Quality score; Indicating the slag in the early stage The target quality score is typically set at 5%. Indicating high basicity foundry residue Quality score.

[0047] (2) After the converter is loaded, add 40% to 60% of the required amount of high basicity casting residue to the furnace along with lime before blowing, and control the position of the oxygen lance at 1.9m-2.1m.

[0048] Before starting the blowing process, the required amount of high-basicity foundry slag is added. The use of 40%–60% high-basicity foundry residue is intended to balance early slag formation rate with process stability. If all the required high-basicity foundry residue is added at once, the excessive amount of high-basicity slag in the early stage can easily lead to rapid slag expansion and slag overflow. It also results in an excessively high liquid phase ratio, which will make the slag viscosity too low, making it difficult for foam slag to form, weakening the bubble coverage and insulation effect, and reducing the smelting thermal efficiency and dephosphorization effect.

[0049] In this embodiment of the invention, the proportion of high-basicity casting residue added to the furnace initially is adjusted according to the silicon content of the molten iron. When the silicon content of the molten iron is high... When the amount of slag produced increases, the slag basicity decreases and the slag volume increases, so the proportion of high-basicity foundry residue added to the furnace initially should be reduced. When the silicon content of the molten iron is low, the slag volume is small and the basicity is high, so the proportion of high-basicity foundry residue added to the furnace initially should be increased to maintain slag system stability and slag formation rate.

[0050] Controlling the oxygen lance position at 1.9 m–2.1 m expands the jet impact range, accelerates FeO formation in the slag, and promotes lime dissolution, which is beneficial for the early formation of a liquid slag system. Simultaneously, the highly oxidizing slag-steel environment provides more favorable thermodynamic conditions for the early dephosphorization reaction in the converter.

[0051] (3) When the smelting time reaches 3 min to 5 min, add the remaining amount of high basicity casting residue into the furnace;

[0052] In this embodiment of the invention, the mid-stage of smelting is 6 to 12 minutes of blowing. During this stage, the carbon-oxygen reaction is dominant, with a large amount of CO gas continuously released, forming stable foamy slag in the furnace. However, this stage is also prone to abnormal furnace conditions such as slag overflow and dryness, making it a critical period in the converter smelting process. To address this, this invention introduces the remaining high-basicity casting residue into the converter at approximately 3 to 5 minutes into the smelting process. This timely replenishment and adjustment of the slag basicity and liquid phase ratio optimizes the slag permeability and fluidity, mitigating the risk of localized slag bulging caused by concentrated gas release. The oxygen lance position during the mid-stage of smelting needs to be dynamically fine-tuned based on online signals such as the amount of bubbles in the furnace, slag surface fluctuations, and flame morphology to ensure the smooth progress of the carbon-oxygen reaction.

[0053] (4) In the later stage of smelting, the position of the oxygen lance is controlled at 1.7m~2.0m, and 200~300 kg of lime is added when the smelting time reaches 12min~14min.

[0054] In the later stages of blowing, the oxygen lance position is controlled at 1.7m~2.0m. The purpose is to rationally regulate the FeO content in the slag. If the oxygen lance position is high, the FeO content in the slag will be too high. Although the oxidizing power will be enhanced, the slag viscosity will be significantly reduced, and the slag and molten steel will not be clearly separated, making it easy for steel and slag to mix during tapping. Conversely, if the oxygen lance position is low, the FeO level in the slag will be low, and the overall oxidizing power of the slag will be insufficient. This will easily lead to significant phosphorus reversion in the final stage, causing the phosphorus content in the molten steel to rebound and reducing the dephosphorization effect.

[0055] Adding 200-300 kg of lime is to increase the basicity of the slag and promote the precipitation of tricalcium silicate in the slag. Tricalcium silicate can effectively fix phosphorus as a solid solution and stably form... Phase, the formula is: Thermodynamically, high alkalinity increases the activity of CaO and decreases its activity. The formation free energy drives phosphorus migration into the slag; kinetically, tricalcium silicate precipitation provides migration / adsorption sites and coordinates with... The re-release mechanism regulates viscosity and mass transfer, achieving deep solid solution fixation of phosphorus and suppressing phosphorus reversion at the endpoint.

[0056] The selection of the oxygen lance position of 1.9–2.1 m in step (2) and the oxygen lance position of 1.7–2.0 m in step (4) are based on the comprehensive statistical analysis and fitting optimization results of multiple factors such as lance position height, slag flow state, dephosphorization effect and steel material consumption during long-term converter production.

[0057] The converter rapid slag formation method based on high-basicity foundry residue provided by the invention has the following beneficial technical effects: (1) By adopting the strategy of adding high-basicity foundry residue in batches, the foundry residue is formed in a rapid manner. The content is controlled in stages, combined with gun position adjustment, to achieve rapid slag formation in the early stage and stable dephosphorization in the later stage of the converter, avoiding the problems of delayed slag formation and large fluctuations in slag properties in traditional methods, and significantly improving the stability of the smelting process; (2) A high-basicity casting residue calculation method based on furnace charge information is established, which can scientifically determine the amount of casting residue added under different smelting conditions, reduce the dependence on the experience of operators, and realize the quantitative and standardized control of the converter slag formation system; (3) Compared with the existing method of improving slag formation by relying on sintered ore, this invention achieves the dual functions of fluxing and dephosphorization by reusing high-basicity casting residue. Compared with the reaction that is too violent after the addition of sintered ore, which is prone to splashing and overflow, the casting residue has a low melting point and enters the liquid phase more stably, which can effectively improve the safety and stability of the smelting process; (4) Adding lime in the later stage of blowing can promote the precipitation of tricalcium silicate, and The reaction generates a stable tricalcium phosphate phase, achieving deep fixation of phosphorus and effectively suppressing phosphorus reversion at the endpoint.

[0058] The high-basicity casting residue used in Example 1 was taken from Maanshan Iron & Steel Co., Ltd., and its detailed composition is shown in Table 1 below. The charging information for this furnace is shown in Table 2 below.

[0059] Table 1. Composition of high-basicity foundry residue in Example 1 (wt%)

[0060]

[0061] Table 2. Furnace loading information for Example 1

[0062]

[0063] Before the converter smelting begins, based on the charging information, material balance calculations determine the required total amount of high-basicity foundry residue to be 1266 kg, in order to ensure the initial slag content... The content was maintained at approximately 5%. Since the Si content in the molten iron was 0.32%, which is at a moderate level, 633 kg of the slag was added simultaneously with the first batch of lime before the blowing began after the converter was charged, and the basic lance position was controlled at 1.95 m to promote early slag formation. After approximately 3.5 minutes of blowing, the remaining 633 kg of casting residue was added to the furnace to stabilize the slag liquid phase ratio and basicity level. During the middle stage of blowing, the lance position was dynamically adjusted according to the height of the foamy slag to stabilize the furnace conditions. In the later stage of blowing, the lance position was maintained at 1.9 m, and 230 kg of lime was added. Analysis of the smelting process showed that a stable liquid phase was formed 232 seconds after the start of blowing, the total blowing time was 752 seconds, and the final [P] of the molten steel was 0.009%.

[0064] The high-basicity casting residue used in Example 2 was obtained from Maanshan Iron & Steel Co., Ltd., and its detailed composition is shown in Table 3 below. The charging information for this furnace is shown in Table 4 below.

[0065] Table 3. Composition of high-basicity casting residue from Example 2 (wt%)

[0066]

[0067] Table 4. Furnace loading information for Example 2

[0068]

[0069] Before the converter smelting began, material balance calculations determined that the required total amount of high-basicity foundry slag to be added was 1453 kg, so that the slag in the early stage... The content was controlled at approximately 5%. Since the Si content in the molten iron was 0.45%, which is relatively high, and the slag volume was relatively large, only 40% (580 kg) of high-basicity foundry slag was added simultaneously with the first batch of lime before the converter was charged and before blowing began. The basic lance position was controlled at 1.9 m to avoid excessive slag expansion in the early stages. After approximately 4 minutes of blowing, the remaining 873 kg of high-basicity foundry slag was added. During the middle stage of blowing, the lance position was dynamically adjusted according to the height of the foamy slag to stabilize the furnace conditions. In the later stage of blowing, the lance position was maintained at 1.75 m, and 280 kg of lime was added. Analysis of the smelting process showed that a stable liquid phase was formed 229 seconds after the start of blowing, the total blowing time was 733 seconds, and the final [P] of the molten steel was 0.011%.

[0070] The high-basicity casting residue used in Example 3 was obtained from Zhongtian Iron & Steel Co., Ltd., and its detailed composition is shown in Table 5 below. The charging information for this heat is shown in Table 6 below.

[0071] Table 5. Composition of high-basicity foundry residue from Example 3 (wt%)

[0072]

[0073] Table 6. Furnace loading information for Example 3

[0074]

[0075] Before the converter smelting began, material balance calculations determined the required total amount of high-basicity foundry residue to be 836 kg, ensuring that the initial slag... The content was maintained at approximately 5%. Since the Si content in the molten iron was only 0.18%, which was relatively low, and the slag volume was insufficient, 60% (500 kg) of high-basicity foundry residue was added simultaneously with the first batch of lime before the converter was charged and before blowing began. The basic lance position was controlled at 2.05 m to accelerate the formation of early liquid phase slag. After approximately 3 minutes of blowing, the remaining 336 kg of high-basicity foundry residue was added. During the middle stage of blowing, the lance position was dynamically adjusted according to the height of the foamy slag to stabilize the furnace conditions. In the later stage of blowing, the lance position was controlled at 1.95 m, and 200 kg of lime was added. Analysis of the smelting situation showed that a stable liquid phase was formed 202 seconds after blowing began, the total blowing time was 678 seconds, and the final [P] of the molten steel was 0.011%. The slag in Examples 1 to 3 above... Target quality score .

[0076] To verify the superiority of this invention in terms of slag formation rate and dephosphorization effect, the existing converter process of Maanshan Iron & Steel Special Steel Co., Ltd. was selected as a comparative example. The conventional process currently used by this company involves operators adding a certain amount of sinter based on experience during converter smelting, according to charging information, and manually adjusting the position of the top-blown oxygen lance to achieve slag formation and dephosphorization control. For a direct comparison, key indicators such as early slag formation time, slag overflow frequency, final [P] content in molten steel, and total blowing time were selected as comparison items. The performance of the existing technology and this invention in 50 heats was statistically analyzed, as shown in Table 7 below.

[0077] Table 7 Comparison of the effects of existing technology and the present invention

[0078]

[0079] Under existing technologies, the average initial slag formation time is 264.3 s, with a lag in the formation of the liquid phase in the slag system. Using the method of this invention, the slag formation time is shortened to 225.5 s, approximately 40 s earlier, resulting in faster early liquid phase slag formation and facilitating timely containment. The process removes oxidation products such as FeO and establishes a stable basicity. Regarding the total blowing time, existing technologies average 762 s, while this invention shortens it to 704 s, significantly accelerating the smelting pace and improving production efficiency. The final [P] content in the molten steel decreases by more than 25%, demonstrating a significant improvement in dephosphorization.

[0080] Furthermore, the average slag overflow frequency under existing technologies is 0.16 times per furnace, while this invention reduces it to 0.10 times per furnace, decreasing the risk of slag overflow by nearly 40% and effectively suppressing abnormal furnace conditions. In summary, the method of this invention not only demonstrates superior performance in slag formation rate and dephosphorization efficiency but also exhibits significant advantages in smelting rhythm control and furnace condition stability. Its overall effect is significantly better than existing technologies, making it highly valuable for widespread application.

[0081] The present invention has been described by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A rapid slag formation method for converters based on high-basicity foundry residue, characterized in that, The method is as follows: (1) Before the start of converter smelting, calculate the required amount of high basicity foundry slag to be added based on the furnace charge information, so as to control the amount of high basicity foundry slag in the early stage. The content is the target mass fraction; (2) After the converter is loaded, before the blowing starts, add 40% to 60% of the required amount of high-basicity foundry residue and lime into the furnace simultaneously. (3) When the smelting time reaches 3 min to 5 min, add the remaining amount of high basicity casting residue into the furnace.

2. The rapid slag formation method for high-basicity foundry residue in a converter as described in claim 1, characterized in that, In the early stage of slag The specific method for determining the target quality score is as follows: (11) Detect the slag sampled from the current furnace. The mass fraction was determined, and the liquidus temperature of the sample slag was tested to maintain the concentration in subsequent batches of slag. The quality fraction remains unchanged, and the detection is currently... Furnace lining erosion thickness at mass fraction; (12) Change the slag in the next batch Quality score, proceed to step (11); (13) The slag obtained through steps (11) to (12) above is in different Liquidity temperature and furnace lining erosion thickness at mass fraction; (14) Select slag with small lining erosion thickness and low liquidus temperature. Mass fraction as a component of the initial slag The target quality score.

3. The rapid slag formation method for high-basicity foundry residue in a converter as described in claim 1, characterized in that, In the early stage of slag The target quality score is 5%.

4. The method for rapid slag formation in a converter from high-basicity foundry residue as described in claim 1, characterized in that, When the silicon content of molten iron is high, reduce the proportion of high basicity casting residue added in step (2); when the silicon content of molten iron is low, increase the proportion of high basicity casting residue added in step (2).

5. The method for rapid slag formation in a converter from high-basicity foundry residue as described in claim 1, characterized in that, In step (2), the position of the oxygen lance is controlled between 1.9 m and 2.1 m.

6. The method for rapid slag formation in a converter from high-basicity foundry residue as described in claim 1, characterized in that, In the later stages of smelting, the oxygen lance position is controlled at 1.7m~2.0m, and 200~300 kg of lime is added when the smelting time reaches 12min~14min.

7. The method for rapid slag formation in a converter from high-basicity foundry residue as described in claim 1, characterized in that, The total slag volume and the amount of high-basic casting residue added based on the material balance calculation are calculated.

8. The method for rapid slag formation in a converter from high-basicity foundry residue as described in claim 7, characterized in that, Total slag volume The calculation formula is as follows: ； in, Indicates the total slag volume; This indicates the total weight of molten iron in the current furnace batch; This indicates the mass fraction of Si in molten iron. This indicates the mass fraction of Mn in molten iron. Indicates the amount of excipients added; This indicates the amount of slag carried into the converter by the molten iron; This indicates the mass fraction of FeO in the slag.

9. The rapid slag formation method for high-basicity foundry residue in a converter as described in claim 8, characterized in that, Required amount of high-basicity foundry slag added The specific calculation formula is as follows: ； in, Indicates the required amount of high-basicity foundry residue to be added; This indicates that molten iron is carried into the converter slag. Quality score; Indicating the slag in the early stage The target quality score, Indicating high basicity foundry residue Quality score.

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