A method of controlling slag sticking to a torpedo ladle lip

Abstract

The application provides a method for controlling slag sticking of a torpedo ladle mouth, and belongs to the field of steel metallurgy. The method comprises the following steps: determining the adding amount of the first batch of lime according to the set value of the torpedo ladle iron receiving amount, the composition of the molten iron, the adding amount and composition of the iron-containing resource, the amount and composition of the slag discharged from the blast furnace; mixing the second batch of lime and limestone to obtain a mixture; receiving iron in the torpedo ladle, and adding the iron-containing resource and the first batch of lime into the torpedo ladle respectively under the condition of setting the adding time; and adding the mixture into the torpedo ladle after the iron receiving is completed, so as to further modify the slag. By adding lime and limestone, the high-viscosity molten slag after the torpedo ladle is matched with the iron-containing resource is modified into low-viscosity molten slag, the problem of slag sticking of the torpedo ladle mouth after the torpedo ladle is matched with the iron-containing resource is solved, and the amount of the iron-containing resource for matching is ensured.

Description

Technical Field

[0001] This application relates to the field of iron and steel metallurgy technology, and in particular to a method for controlling slag adhesion at the mouth of a torpedo canister. Background Technology

[0002] Steel slag and iron slag generated during the steel manufacturing process are collectively referred to as iron-containing solid waste. Characterized by their large volume and high iron content, their recycling has always been a hot topic for steel companies, playing a crucial role in cost reduction, efficiency improvement, and environmental protection. Currently, domestic and international steel companies primarily use methods such as magnetic separation to extract iron-containing resources with an iron content ≥60% from these solid wastes, which are then recycled. The recycling of iron-containing resources mainly includes two methods: first, returning them to the sintering process to prepare sinter for use as raw material in ironmaking; second, using them as metal feedstock in steelmaking furnaces. For sintering utilization: iron-containing resources originate from steel slag and iron slag, and impurities in these materials easily accumulate in the iron-containing resources, affecting the quality of sinter and the smooth operation of the blast furnace. For steelmaking furnace utilization: iron-containing resources have a high iron oxide content, which affects the carbon-oxygen reaction when added to the furnace; improper control can easily lead to slag overflow and splashing problems. In summary, the recycling of iron-containing resources has a significant impact on steel production, but its utilization rate is somewhat limited.

[0003] To address these issues, some domestic and international steel companies have attempted to incorporate iron-containing resources into torpedo ladles to improve their utilization rate. However, because these resources contain a significant amount of SiO2, and the iron oxides oxidize the Si in the molten iron upon addition, SiO2 is generated and enters the slag. Consequently, incorporating iron-containing resources reduces the basicity of the slag and increases its viscosity, making it prone to adhering to the ladle opening during subsequent molten iron pouring. The hazards of slag adhesion include: firstly, it corrodes the refractory material at the ladle opening, affecting its service life; secondly, it prevents the ladle's insulation cover from opening and closing properly, hindering temperature control; and thirdly, it affects the stability of the pouring flow during molten iron pouring, increasing the risk of accidents. Slag adhesion at the ladle opening is typically addressed using specialized equipment during torpedo ladle maintenance. This means that the problem of slag adhesion persists throughout the normal operation of the torpedo ladle. Summary of the Invention

[0004] This application provides a method for controlling slag adhesion at the mouth of a torpedo ladle, in order to solve the technical problem of slag adhesion at the mouth of the ladle during the process of pouring molten iron from the torpedo ladle into the ladle.

[0005] This application provides a method for controlling slag adhesion at the mouth of a torpedo canister, the method comprising:

[0006] The amount of lime to be added in the first batch is determined based on the set value of the iron receiving amount in the torpedo ladle, the composition of the molten iron, the amount and composition of iron-containing resources added, and the amount and composition of blast furnace slag.

[0007] The second batch of lime was mixed with limestone to obtain a mixture.

[0008] The torpedo can is connected to iron, and iron-containing resources and the first batch of lime are added to the torpedo can under the set addition timing conditions.

[0009] After the torpedo ladle has finished receiving the iron, the mixture is added to the torpedo ladle to further modify the slag.

[0010] Optionally, adding iron-containing resources and the first batch of lime to the torpedo canister under the set timing conditions includes:

[0011] When the amount of iron in the torpedo can is in the range of 1 / 10 to 1 / 3, iron-containing resources are added to the torpedo can.

[0012] When the amount of iron attached to the torpedo can is in the range of 1 / 3 to 2 / 3, the first batch of lime is added to the torpedo can.

[0013] Optionally, the amount of iron-containing resource added is 20 kg / t molten iron to 35 kg / t molten iron, and the particle size of the iron-containing resource is 30 mm to 50 mm.

[0014] Optionally, the amount of lime added in the first batch satisfies the following relationship:

[0015]

[0016] In the formula, X1 represents the amount of lime added in the first batch, and F represents the amount of iron-containing resources added. SiO2 This indicates the mass ratio of SiO2 in the iron-containing resources, and S represents the amount of blast furnace slag. SiO2 The following values ​​represent the mass ratio of SiO2 in blast furnace slag, T represents the set value of iron feeding, [Si] represents the [Si] content in molten iron, O[Si] represents the [Si] oxidation ratio, B represents the basicity of slag, L1 represents the mass ratio of CaO in the first batch of lime, and F... CaO S represents the mass ratio of CaO in iron-containing resources. CaO This indicates the mass ratio of CaO in iron-containing resources and blast furnace slag.

[0017] Optionally, the particle size of the first batch of lime is 1 mm to 5 mm.

[0018] Optionally, the amount of the second batch of lime added satisfies the following relationship:

[0019]

[0020] In the formula, X2 represents the amount of lime added in the second batch, R represents the actual amount of iron added, T represents the set value of the amount of iron added, [Si] represents the [Si] content of molten iron, O[Si] represents the [Si] oxidation ratio, B represents the basicity of slag, and L2 represents the mass ratio of CaO in the second batch of lime.

[0021] Optionally, the actual amount of iron contacted is 90% to 93% of the torpedo canister capacity.

[0022] Optionally, the basicity of the slag is 1.2 to 1.6.

[0023] Optionally, the iron contact amount is set to 90% of the torpedo can capacity.

[0024] Optionally, the mass of the limestone is 15% to 20% of the mass of the second batch of lime.

[0025] The technical solutions provided in this application have the following advantages compared with the prior art:

[0026] This application provides a method for controlling slag adhesion at the mouth of a torpedo ladle. First, based on the torpedo ladle's iron-feeding capacity setting, the composition of the molten iron, the amount and composition of iron-containing resources added, and the amount and composition of blast furnace slag, the amount of lime to be added in the first batch is precisely calculated. This allows for pre-adjustment of the slag composition through reasonable batching, thereby reducing its viscosity. Second, a second batch of lime is mixed with limestone to obtain a mixture, and the amount of the mixture added is determined based on the actual iron-feeding capacity of the torpedo ladle. Limestone decomposes upon heating, producing CO2 gas. This gas acts as a stirrer in the slag, contributing to the rapid melting of the lime and the homogenization of the slag. Simultaneously, the addition of lime can further adjust the basicity of the slag, thereby reducing its viscosity. Secondly, during the torpedo ladle receiving process, iron-containing resources and the first batch of lime are added at predetermined times, ensuring thorough mixing of the iron-containing resources with the molten iron, improving the metal yield of the iron-containing resources, and ensuring the rapid melting of the first batch of lime. Finally, through the addition of lime, high-viscosity components in the slag (such as SiO2) are effectively diluted, and the basicity of the slag is reasonably adjusted, thus achieving low viscosity slag. Low-viscosity slag is less likely to adhere to the ladle opening during the pouring of molten iron from the torpedo ladle to the ladle, thus solving the technical problem of slag sticking to the ladle opening. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart illustrating a method for controlling slag adhesion at the mouth of a torpedo canister, as provided in an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0032] Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts representation," such as parts by weight or parts by mass, indicates the proportional relationship between components. In the proportional relationships discussed in this article, parameters that need to be described by proportion should be understood as the first term of the proportion in the order of description, while the proportion figure should be understood as the second term. For example, if the mass ratio of substance A, substance B, and substance C is 1:2:3, then substances A, B, and C should correspond one-to-one with the proportion figure in the proportion in the order of description, i.e., the mass of substance A : the mass of substance B : the mass of substance C = 1:2:3.

[0033] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0034] Figure 1 This is a flowchart illustrating a method for controlling slag adhesion at the mouth of a torpedo canister, as provided in an embodiment of this application.

[0035] like Figure 1 As shown, this application provides a method for controlling slag adhesion at the mouth of a torpedo canister, the method comprising:

[0036] S1. Determine the amount of lime to be added in the first batch based on the set value of the amount of iron received in the torpedo ladle, the composition of the molten iron, the amount and composition of iron-containing resources added, and the amount and composition of slag from the blast furnace.

[0037] In some embodiments, the amount of the first batch of lime added satisfies the following relationship:

[0038]

[0039] In the formula, X1 represents the amount of lime added in the first batch, and F represents the amount of iron-containing resources added. SiO2 This indicates the mass ratio of SiO2 in the iron-containing resources, and S represents the amount of blast furnace slag. SiO2 The following values ​​represent the mass ratio of SiO2 in blast furnace slag, T represents the set value of iron feeding, [Si] represents the [Si] content in molten iron, O[Si] represents the [Si] oxidation ratio, B represents the basicity of slag, L1 represents the mass ratio of CaO in the first batch of lime, and F... CaO S represents the mass ratio of CaO in iron-containing resources. CaO This indicates the mass ratio of CaO in iron-containing resources and blast furnace slag.

[0040] Based on the composition of molten iron, iron resources, and the composition of blast furnace slag, as well as the required basicity of the slag, the precise amount of lime to be added in the first batch is crucial to ensure the effectiveness of slag modification. Controlling the amount added is essential for adjusting the viscosity and fluidity of the slag.

[0041] In some embodiments, the particle size of the first batch of lime is 1 mm to 5 mm.

[0042] Limiting the particle size to 1mm to 5mm can accelerate the melting rate of lime and improve slag modification efficiency. Particles that are too small may cause dust problems during the feeding process, while particles that are too large will affect the melting effect of the lime. For example, the particle size of the first batch of lime can be 1mm, 2mm, 3mm, 4mm, 5mm, etc.

[0043] In some embodiments, the basicity of the slag is 1.2 to 1.6.

[0044] The slag basicity should be controlled within the range of 1.2 to 1.6, as it directly affects the slag's viscosity and flowability. Appropriate basicity ensures good slag flowability and prevents sticking to the ladle. If the slag basicity is too low, the higher SiO2 content leads to increased slag viscosity, and the sticking problem remains unresolved. Conversely, if the slag basicity is too high, the higher CaO content leads to increased slag melting temperature, increasing the mass percentage of solid slag, but the slag viscosity remains high, and the sticking problem persists. For example, the slag basicity can be 1.2, 1.3, 1.4, 1.5, or 1.6.

[0045] In some embodiments, the contact amount is set to 90% of the torpedo can capacity.

[0046] The molten iron loading capacity is typically set at 90% of the torpedo ladle's capacity to ensure full utilization of the molten iron and avoid the risk of overflow.

[0047] S2. Mix the second batch of lime with limestone to obtain a mixture.

[0048] S3. Connect the torpedo can to iron, and under the set addition timing conditions, add iron-containing resources and the first batch of lime to the torpedo can respectively;

[0049] It should be noted that iron-containing resources mainly refer to substances or materials containing iron, which can be extracted and recycled through various processing methods. In the production process of steel enterprises, iron-containing solid waste is a common type of waste, containing a large amount of iron. Through processing methods such as magnetic separation, resources with high iron content can be effectively extracted from these solid wastes.

[0050] In some embodiments, adding iron-containing resources and the first batch of lime to the torpedo canister at a predetermined timing includes:

[0051] When the amount of iron in the torpedo can is in the range of 1 / 10 to 1 / 3, iron-containing resources are added to the torpedo can.

[0052] When the amount of iron attached to the torpedo can is in the range of 1 / 3 to 2 / 3, the first batch of lime is added to the torpedo can.

[0053] The iron-containing resource is added when the amount of iron is 1 / 10 to 1 / 3. In the initial stage of adding iron to the torpedo ladle, the amount of molten iron is relatively small to prevent molten iron from splashing out of the ladle during the process of adding iron-containing resources. At the same time, after the iron-containing resource is added, the subsequent addition of molten iron can promote the melting and reaction of the iron-containing resource.

[0054] In some embodiments, the amount of iron-containing resource added is 20 kg / t molten iron to 35 kg / t molten iron, and the particle size of the iron-containing resource is 30 mm to 50 mm.

[0055] The amount of iron-containing resource added is limited to 20 kg / t molten iron to 35 kg / t to ensure effective utilization of iron-containing resources while avoiding significant impact on the composition and temperature of the molten iron. Too low an addition amount hinders the recycling of iron-containing resources, while too high an amount may affect the temperature of the molten iron and increase slag volume. The particle size of the iron-containing resource is limited to 30 mm to 50 mm to facilitate uniform distribution and effective melting of the iron-containing resource in the torpedo ladle, avoiding uneven melting or environmental problems caused by excessively large or small particles. For example, the amount of iron-containing resource added can be 20 kg / t molten iron, 22 kg / t molten iron, 25 kg / t molten iron, 28 kg / t molten iron, 30 kg / t molten iron, 32 kg / t molten iron, 35 kg / t molten iron, etc., and the particle size of the iron-containing resource can be 30 mm, 32 mm, 35 mm, 40 mm, 45 mm, 48 mm, 50 mm, etc.

[0056] S4. After the torpedo ladle has finished receiving the iron, add the mixture into the torpedo ladle according to the actual amount of iron received, so as to further improve the slag.

[0057] In some embodiments, the amount of the second batch of lime added satisfies the following relationship:

[0058]

[0059] In the formula, X2 represents the amount of lime added in the second batch, R represents the actual amount of iron added, T represents the set value of the amount of iron added, [Si] represents the [Si] content of molten iron, O[Si] represents the [Si] oxidation ratio, B represents the basicity of slag, and L2 represents the mass ratio of CaO in the second batch of lime.

[0060] Based on the difference between the actual amount of molten iron and the set value, as well as the requirements for the composition of molten iron and the basicity of slag, the amount of lime to be added in the second batch is precisely calculated in order to further adjust the composition and properties of the slag.

[0061] In some embodiments, the actual amount of iron contacted is 90% to 93% of the torpedo canister capacity.

[0062] The actual amount of iron dispensed is within 90% to 93% of the torpedo ladle capacity. Accurate control of the actual amount of iron dispensed has a significant impact on the stability of molten iron production and the allocation of iron-containing resources. For example, the actual amount of iron dispensed can be 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93% of the torpedo ladle capacity, etc.

[0063] In some embodiments, the mass of the limestone is 15% to 20% of the mass of the second batch of lime.

[0064] The limestone content should be controlled within 15% to 20% of the second batch's mass. Due to the lack of molten iron impact, the melting kinetics of the second batch are poor. Adding limestone causes it to decompose upon heating, producing CO2 gas, which provides some stirring and promotes melting. However, excessive limestone addition should be avoided, as its endothermic decomposition will significantly lower the molten iron temperature and significantly increase the slag basicity. Higher CaO content leads to a higher slag melting temperature, an increased percentage of solid slag, and still high slag viscosity, failing to resolve the problem of slag sticking to the ladle. Furthermore, excessive limestone decomposition may cause slag overflow. For example, the limestone content can be 15%, 16%, 17%, 18%, 19%, or 20% of the second batch's mass.

[0065] The method for controlling slag adhesion at the mouth of torpedo canisters provided in this application has the following significant advantages:

[0066] (1) Precise control of composition and performance: By accurately calculating the amount of lime added in the first and second batches, and based on the composition of molten iron, iron-containing resources and the composition of blast furnace slag, as well as the requirements of slag basicity, the composition and performance of slag are precisely controlled. The high viscosity slag after being mixed with iron-containing resources in the torpedo ladle is modified into low viscosity slag, thus solving the problem of slag sticking to the ladle mouth during the process of pouring molten iron into the ladle.

[0067] (2) Optimization of melting and reaction efficiency: Strict control over the particle size of iron-containing resources and lime ensures their uniform distribution and effective melting in the torpedo ladle. This not only improves melting efficiency but also promotes full reaction between slag and iron, thereby increasing the metal recovery rate of iron-containing resources.

[0068] (3) Energy conservation, emission reduction and environmental protection: This method reduces resource waste and waste emissions by recycling iron-containing resources and precisely controlling the amount of smelting auxiliary materials such as lime added. In addition, the addition of CO2 gas generated from limestone to stir the second batch of lime promotes its melting.

[0069] (4) Flexibility and adaptability: This method is highly flexible and adaptable, and can be adjusted and optimized according to different molten iron compositions, iron-containing resources, and blast furnace slag compositions. This makes the method widely applicable to different types of steel enterprises and smelting processes.

[0070] (5) Improved economic efficiency: By accurately calculating and controlling the amount of various raw materials added, this method can maximize the economic benefits of iron-containing resource recovery. At the same time, by reducing waste emissions and environmental pollution, it also helps to enhance the company's social image and brand value.

[0071] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards. If there is no corresponding industry standard, then common international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0072] The following examples and comparative examples all use torpedo tanks with a standard capacity of 230t.

[0073] Example 1

[0074] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 20 kg / t of molten iron with a particle size of 30 mm, and the particle size of lime is 1 mm.

[0075] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0076] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 908.5 kg, and the slag basicity was 1.2;

[0077] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0078] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 4.6 kg, and the actual amount of iron is controlled to be 91% of the torpedo ladle capacity;

[0079] 6) The amount of limestone added is 15% of the amount added in the second batch of lime.

[0080] Example 2

[0081] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 30 kg / t of molten iron with a particle size of 40 mm, and the particle size of lime is 3 mm.

[0082] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0083] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 1460.5 kg, and the slag basicity was 1.4;

[0084] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0085] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 10.7 kg, and the actual amount of iron is controlled to be 92% of the torpedo ladle capacity;

[0086] 6) The amount of limestone added is 17% of the amount added in the second batch of lime.

[0087] Example 3

[0088] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 35 kg / t of molten iron with a particle size of 50 mm, and the particle size of lime is 5 mm.

[0089] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0090] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 1935.4 kg, and the slag basicity was 1.6;

[0091] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0092] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 18.4 kg, and the actual amount of iron is controlled to be 93% of the torpedo ladle capacity;

[0093] 6) The amount of limestone added is 20% of the amount added in the second batch of lime.

[0094] Comparative Example 1

[0095] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 30 kg / t of molten iron with a particle size of 40 mm, and the particle size of lime is 3 mm.

[0096] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0097] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 570.4 kg, and the slag basicity was 0.8;

[0098] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0099] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 6.1 kg, and the actual amount of iron is controlled to be 92% of the torpedo ladle capacity;

[0100] 6) The amount of limestone added is 17% of the amount added in the second batch of lime.

[0101] Comparative Example 2

[0102] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 40 kg / t of molten iron with a particle size of 40 mm, and the particle size of lime is 0.5 mm.

[0103] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0104] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 1766.4 kg, and the slag basicity was 1.4;

[0105] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0106] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 10.7 kg, and the actual amount of iron is controlled to be 92% of the torpedo ladle capacity;

[0107] 6) The amount of limestone added is 17% of the amount added in the second batch of lime.

[0108] Comparative Example 3

[0109] 1) During the process of receiving molten iron in a torpedo ladle, the amount of iron-containing resources added is 30 kg / t of molten iron with a particle size of 40 mm, and the particle size of lime is 3 mm.

[0110] 2) Iron-containing resources should be added when the iron content in the torpedo can reaches 1 / 3;

[0111] 3) The first batch of lime added was ([(iron resource addition amount·SiO2 mass ratio in iron resource + blast furnace slag amount·SiO2 mass ratio in blast furnace slag + 2.14·set value of iron receiving amount·[Si] content in molten iron·[Si] oxidation ratio)·slag basicity - (iron resource addition amount·CaO mass ratio in iron resource + blast furnace slag amount·CaO mass ratio in blast furnace slag)] / CaO mass ratio in lime) = 1460.5 kg, and the slag basicity was 1.4;

[0112] 4) The first batch of lime should be added when the iron in the torpedo ladle reaches 2 / 3 full;

[0113] 5) The amount of lime added in the second batch is (2.14·difference between actual amount of iron and set amount of iron·iron [Si] content·[Si] oxidation ratio)·slag basicity) / CaO mass ratio in lime) = 26.8 kg. The actual amount of iron added is controlled to be 95% of the torpedo ladle capacity.

[0114] The amount of limestone added is 17% of the amount added in the second batch of lime.

[0115] The effectiveness of the method described in this application embodiment is characterized by the service life of the refractory material of the torpedo canister mouth insulation cover and whether slag overflow occurs during the operation of the torpedo canister. The characterization results are shown in Table 1. As the degree of slag adhesion at the torpedo canister mouth increases, the resistance to slag adhesion during the opening and closing of the torpedo canister mouth insulation cover increases, the refractory material erosion intensifies, and the service life decreases. Therefore, the service life of the torpedo canister mouth insulation cover refractory material can characterize the slag adhesion control effect of the torpedo canister; specifically, the number of torpedo canister turnovers per replacement of the insulation cover refractory material is used as a quantitative indicator.

[0116] Table 1. Characterization results of the torpedo can mouths in the embodiments and comparative examples.

[0117]

[0118] As shown in Table 1, the methods for controlling slag adhesion at the torpedo can mouth provided in Examples 1-3 resulted in significantly longer service lives of the refractory material of the torpedo can mouth insulation cover compared to the comparative examples, indicating that the patented method effectively controls slag adhesion at the can mouth. However, due to the increasing amounts of iron-containing resources and iron in the torpedo cans in Examples 1, 2, and 3, the corresponding slag volume increased, leading to intensified erosion of the refractory material of the can mouth insulation cover. Therefore, the service life of the refractory material of the torpedo can mouth insulation cover in Examples 1, 2, and 3 showed a decreasing trend. In Comparative Example 1, the low basicity of the molten slag resulted in higher viscosity, leading to slag adhesion at the can mouth. In Comparative Examples 2-3, the large amounts of iron-containing resources and iron in the torpedo cans resulted in frequent slag overflow, which adhered to the can mouth, reducing the service life of the refractory material of the insulation cover.

[0119] Furthermore, one or more technical solutions in the embodiments of this application have at least the following technical effects or advantages:

[0120] In this embodiment of the application, by adding lime and limestone, the high-viscosity slag of the torpedo can after being fed with iron-containing resources is modified into low-viscosity slag, which solves the problem of slag sticking to the mouth of the torpedo can after being fed with iron-containing resources, and ensures the amount of iron-containing resources recycled.

[0121] In this embodiment of the application, considering key factors such as the amount of iron received in the torpedo ladle and the composition of the molten iron, the amount and composition of iron-containing resources added, and the amount and composition of slag added from the blast furnace, a mathematical model for calculating the amount of lime added is constructed to achieve precise control of the amount of slag modifier added.

[0122] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling slag adhesion at the mouth of a torpedo canister, the method comprising: The amount of lime to be added in the first batch is determined based on the set value of the iron receiving amount in the torpedo ladle, the composition of the molten iron, the amount and composition of iron-containing resources added, and the amount and composition of blast furnace slag. The second batch of lime was mixed with limestone to obtain a mixture. The torpedo can is connected to iron, and iron-containing resources and the first batch of lime are added to the torpedo can under the set addition timing conditions. After the torpedo ladle has finished receiving the iron, the mixture is added to the torpedo ladle to further modify the slag. The amount of lime added in the first batch satisfies the following relationship: In the formula, X 1 indicates the amount of lime added in the first batch. F This indicates the amount of iron-containing resources added. F SiO2 This indicates the mass ratio of SiO2 in iron-containing resources. S This indicates the amount of slag fed into the blast furnace. S SiO2 This indicates the mass ratio of SiO2 in blast furnace slag. T This indicates the set value for the amount of molten iron to be received, and [Si] indicates the [Si] content of the molten iron. O [Si] indicates the oxidation ratio of [Si]. B Indicates the basicity of the slag. L 1 indicates the mass ratio of CaO in the first batch of lime. F CaO This indicates the mass ratio of CaO in iron-containing resources. S CaO This indicates the mass ratio of CaO in iron-containing resources and blast furnace slag.

2. The method according to claim 1, characterized in that, The step of adding iron-containing resources and the first batch of lime to the torpedo canister under the specified timing conditions includes: When the amount of iron in the torpedo can is in the range of 1 / 10 to 1 / 3, iron-containing resources are added to the torpedo can. When the amount of iron attached to the torpedo can is in the range of 1 / 3 to 2 / 3, the first batch of lime is added to the torpedo can.

3. The method according to claim 2, characterized in that, The amount of iron-containing resource added is 20 kg / t molten iron to 35 kg / t molten iron, and the particle size of the iron-containing resource is 30 mm to 50 mm.

4. The method according to claim 1, characterized in that, The particle size of the first batch of lime is 1mm to 5mm.

5. The method according to claim 1, characterized in that, The amount of lime added in the second batch satisfies the following relationship: In the formula, X 2 indicates the amount of lime added in the second batch. R This indicates the actual amount of iron connected. T This indicates the set value for the amount of molten iron to be received, and [Si] indicates the [Si] content of the molten iron. O [Si] indicates the oxidation ratio of [Si]. B Indicates the basicity of the slag. L 2 indicates the mass ratio of CaO in the second batch of lime.

6. The method according to claim 5, characterized in that, The actual amount of iron contacted is 90% to 93% of the torpedo can's capacity.

7. The method according to claim 1 or 5, characterized in that, The basicity of the slag is 1.2 to 1.

6.

8. The method according to claim 1 or 5, characterized in that, The set value for the iron contact amount is 90% of the torpedo can capacity.

9. The method according to claim 1, characterized in that, The mass of the limestone is 15% to 20% of the mass of the second batch of lime.

Images