Method for controlling slag adhesion at mouth of torpedo ladle

Abstract

The invention provides a method for controlling slag bonding at a torpedo ladle opening, and belongs to the field of ferrous metallurgy. The method comprises the following steps: determining the adding amount of a first batch of lime according to a torpedo ladle iron receiving amount set value, molten iron components, the adding amount and components of iron-containing resources and the blast furnace slag amount and components; mixing the second batch of lime with limestone to obtain a mixed material; carrying out iron receiving on the torpedo ladle, and respectively adding an iron-containing resource and a first batch of lime into the torpedo ladle under a set adding time condition; and after iron receiving of the torpedo ladle is completed, the mixed material is added into the torpedo ladle, and slag modification is further conducted. By adding lime and limestone, high-viscosity slag obtained after the torpedo ladle is fed with the iron-containing resources is modified into low-viscosity slag, the problem that slag adheres to the mouth of the torpedo ladle after the torpedo ladle is fed with the iron-containing resources is solved, and the recycling amount of the iron-containing resources is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of iron and steel metallurgy, and in particular to a method for controlling slag sticking to the mouth of a torpedo tank. Background Art

[0002] Steel slag and iron slag produced in the steel manufacturing process are collectively referred to as iron-containing solid waste. They are characterized by large quantity and high iron content. Therefore, their recycling has always been a hot issue of concern to steel companies, and is of great significance for cost reduction, efficiency improvement and green environmental protection of enterprises. At present, domestic and foreign steel companies mainly obtain iron-containing resources with an iron content of ≥60% from iron-containing solid waste through treatment methods such as magnetic separation, and then recycle the iron-containing resources. There are two main ways to recycle iron-containing resources: one is to return to the sintering process to prepare sintered ore, which is used as iron-making raw materials; the other is to be used as metal materials for steel-making furnaces. For sintering utilization: iron-containing resources come from steel slag and iron slag, and the impurity elements in steel slag and iron slag are easily enriched in iron-containing resources, which in turn affects the quality of sintered ore and the smooth operation of blast furnaces. For steel-making furnace utilization: the iron oxide content in iron-containing resources is relatively high, which affects the carbon-oxygen reaction after being added to the steel-making furnace. If it is not properly controlled, slag splashing is prone to occur. In summary, the recycling of iron-containing resources has a great impact on steel production, and its utilization rate is subject to certain restrictions.

[0003] In order to solve the above problems, some domestic and foreign steel enterprises have tried to add iron-containing resources to torpedo tanks to improve their utilization rate. However, since iron-containing resources contain more SiO2, and at the same time, after adding molten iron, the iron oxides in them will oxidize [Si] in the molten iron to generate SiO2 and enter the slag. In summary, after adding iron-containing resources, the alkalinity of the slag decreases and the viscosity increases. When the molten iron is poured into the torpedo tank in the future, the slag is easy to adhere to the tank mouth. The harm of sticky slag: on the one hand, it erodes the refractory material of the torpedo tank mouth and affects the service life; second, it causes the insulation cover of the torpedo tank mouth to be unable to open and close normally, which is not conducive to the control of temperature drop; third, it affects the stability of the injection flow when pouring molten iron, and safety accidents are prone to occur. For the treatment of sticky slag at the tank mouth, special equipment is generally used for treatment during the maintenance of the torpedo tank. This means that the problem caused by sticky slag has always existed during the normal turnover of the torpedo tank. Summary of the invention

[0004] The present application provides a method for controlling slag sticking to the mouth of a torpedo tank, so as to solve the technical problem of slag sticking to the mouth of the torpedo tank during the process of pouring molten iron into a ladle.

[0005] The present application provides a method for controlling residue sticking to the mouth of a torpedo tank, the method comprising:

[0006] The amount of lime added in the first batch is determined based on the set value of the iron amount in the torpedo tank and the composition of the molten iron, the amount and composition of the iron-containing resources added, and the amount and composition of the slag from the blast furnace;

[0007] Mixing the second batch of lime with limestone to obtain a mixed material;

[0008] Connecting iron to the torpedo tank, and adding iron-containing resources and the first batch of lime to the torpedo tank respectively under set adding timing conditions;

[0009] After the torpedo tank is connected with iron, the mixed material is added into the torpedo tank to further modify the slag.

[0010] Optionally, the adding of the iron-containing resource and the first batch of lime to the torpedo tank respectively under the setting adding timing condition comprises:

[0011] When the iron content of the torpedo tank is within the range of 1 / 10 to 1 / 3, adding iron-containing resources into the torpedo tank;

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

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

[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, F represents the amount of iron-containing resources added, and F SiO2 represents the mass ratio of SiO2 in iron-containing resources, S represents the amount of slag in the blast furnace, and S SiO2 represents the mass ratio of SiO2 in blast furnace slag, T represents the set value of iron intake, [Si] represents the [Si] content of molten iron, O[Si] represents the [Si] oxidation ratio, B represents the slag basicity, L1 represents the mass ratio of CaO in the first batch of lime, F CaO Indicates the mass ratio of CaO in iron-bearing resources, S CaO 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 received, T represents the set value of the amount of iron received, [Si] represents the [Si] content in molten iron, O[Si] represents the [Si] oxidation ratio, B represents the slag basicity, and L2 represents the CaO mass ratio in the second batch of lime.

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

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

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

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

[0025] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0026] The embodiment of the present application provides a method for controlling the sticking slag at the mouth of a torpedo tank. First, the amount of lime added in the first batch is accurately calculated according to the set value of the iron receiving amount of the torpedo tank, the composition of the molten iron, the amount of iron-containing resources added and its composition, and the amount of slag from the blast furnace and its composition, so as to pre-adjust the composition of the slag through reasonable batching to reduce its viscosity; secondly, the second batch of lime is mixed with limestone to obtain a mixed material, and the amount of the mixed material added is determined according to the actual amount of iron received by the torpedo tank. Limestone decomposes and produces CO2 gas when heated, and these gases play a stirring role in the slag, which helps to quickly melt the lime and homogenize the slag. At the same time, the addition of lime can further adjust the alkalinity of the slag, thereby reducing its viscosity; thirdly, in the process of the torpedo tank receiving iron, the iron-containing resources and the first batch of lime are added according to the set addition time, thereby ensuring the full mixing of the iron-containing resources and the molten iron, improving the metal recovery rate of the iron-containing resources, and the rapid melting of the first batch of lime; finally, through the addition of lime, the high-viscosity components (such as SiO2, etc.) in the slag are effectively diluted, and the alkalinity of the slag is reasonably adjusted, thereby achieving low viscosity of the slag. The low-viscosity slag is not easy to adhere to the tank mouth during the process of pouring molten iron from the torpedo tank to the ladle, thus solving the technical problem of slag sticking to the tank mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A flow chart of a method for controlling residue sticking to the mouth of a torpedo tank provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have 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., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0032] In addition, in the description of the specification of the present application, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second", etc. are only used 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 article, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" means one or more, and "plurality" means two or more. "At least one", "the following at least one item (items)" or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one-to-one with the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

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

[0034] Figure 1 A flow chart of a method for controlling residue sticking to the mouth of a torpedo tank provided in an embodiment of the present application.

[0035] like Figure 1 As shown, the present application provides a method for controlling the sticking residue at the mouth of a torpedo tank, the method comprising:

[0036] S1. Determine the amount of lime added in the first batch according to the set value of the iron amount received by the torpedo tank and the composition of the molten iron, the amount and composition of the iron-containing resources added, and the amount and composition of the slag from the blast furnace;

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

[0038]

[0039] In the formula, X1 represents the amount of lime added in the first batch, F represents the amount of iron-containing resources added, and F SiO2 represents the mass ratio of SiO2 in iron-containing resources, S represents the amount of slag in the blast furnace, and S SiO2 represents the mass ratio of SiO2 in blast furnace slag, T represents the set value of iron intake, [Si] represents the [Si] content of molten iron, O[Si] represents the [Si] oxidation ratio, B represents the slag basicity, L1 represents the mass ratio of CaO in the first batch of lime, F CaO Indicates the mass ratio of CaO in iron-bearing resources, S CaO Indicates the mass ratio of CaO in iron-containing resources and blast furnace slag.

[0040] According to the composition of molten iron, iron resources, blast furnace slag composition, and slag basicity requirements, the amount of lime added in the first batch is accurately calculated to ensure the effect of slag modification. Control of the amount of lime added is crucial to adjusting the viscosity and fluidity of the slag.

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

[0042] The particle size is limited to 1mm to 5mm, which can speed up the melting speed of lime and improve the slag modification efficiency. Too small particle size may cause dust problems during the feeding process, while too large particle size will affect the melting effect of lime. Exemplarily, the particle size of the first batch of lime can be 1mm, 2mm, 3mm, 4mm, 5mm, etc.

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

[0044] The slag basicity is controlled within the range of 1.2 to 1.6. The slag basicity has a direct impact on the viscosity and fluidity of the slag. Appropriate basicity can ensure good fluidity of the slag and avoid the problem of sticking to the tank mouth. If the slag basicity is controlled too low, a higher content of SiO2 will lead to increased slag viscosity, and the problem of sticking to the tank mouth cannot be solved; if the slag basicity is controlled too high, a higher content of CaO will lead to an increase in the slag melting temperature, an increase in the mass percentage of the solid phase slag, and the slag viscosity is still high, and the problem of sticking to the tank mouth cannot be solved. Exemplarily, the slag basicity can be 1.2, 1.3, 1.4, 1.5, 1.6, etc.

[0045] In some embodiments, the iron receiving amount setting value is 90% of the torpedo tank capacity.

[0046] The set value of the iron receiving amount is usually 90% of the torpedo tank capacity to ensure full utilization of the molten iron and avoid the risk of overflow.

[0047] S2, mixing the second batch of lime with limestone to obtain a mixed material;

[0048] S3, connecting iron to the torpedo tank, and adding iron-containing resources and the first batch of lime to the torpedo tank respectively under set adding timing conditions;

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

[0050] In some embodiments, the adding of the iron-containing resource and the first batch of lime to the torpedo tank respectively under the setting addition timing conditions comprises:

[0051] When the iron content of the torpedo tank is within the range of 1 / 10 to 1 / 3, adding iron-containing resources into the torpedo tank;

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

[0053] The timing for adding iron-containing resources is when the amount of iron received is 1 / 10 to 1 / 3. In the initial stage of iron receiving in the torpedo tank, the amount of molten iron is relatively small, which prevents the molten iron from splashing out of the tank mouth during the addition of iron-containing resources. At the same time, after the iron-containing resources are added, the subsequent addition of molten iron can promote the melting and reaction of the iron-containing resources.

[0054] In some embodiments, the amount of the 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 resources added is limited to 20kg / t molten iron to 35kg / t molten iron, ensuring the effective utilization of iron-containing resources while avoiding a greater impact on the composition and temperature of the molten iron. Too low an amount added is not conducive to the recycling of iron-containing resources, while too high an amount may affect the temperature of the molten iron and increase the amount of slag. The particle size of the iron-containing resources is limited to 30mm to 50mm, which helps to uniformly distribute and effectively melt the iron-containing resources in the torpedo tank, avoiding uneven melting or environmental problems caused by too large or too small particles. Exemplarily, the amount of iron-containing resources added can be 20kg / t molten iron, 22kg / t molten iron, 25kg / t molten iron, 28kg / t molten iron, 30kg / t molten iron, 32kg / t molten iron, 35kg / t molten iron, etc., and the particle size of the iron-containing resources can be 30mm, 32mm, 35mm, 40mm, 45mm, 48mm, 50mm, etc.

[0056] S4, after the torpedo tank is completely charged with iron, the mixed material is added into the torpedo tank according to the actual amount of iron charged in the torpedo tank, so as to further modify 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 received, T represents the set value of the amount of iron received, [Si] represents the [Si] content in molten iron, O[Si] represents the [Si] oxidation ratio, B represents the slag basicity, and L2 represents the CaO mass ratio in the second batch of lime.

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

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

[0062] The actual iron quantity is within the range of 90% to 93% of the torpedo tank capacity. The accurate control of the actual iron quantity has an important influence on the stability of molten iron production and the consumption of iron-containing resources. For example, the actual iron quantity can be 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, etc. of the torpedo tank capacity.

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

[0064] Controlled within the range of 15% to 20% of the mass of the second batch of lime, due to the lack of iron flow impact, the kinetic conditions for melting the second batch of lime are poor, and after adding limestone, it is thermally decomposed to produce CO2 gas, which has a certain stirring effect on the second batch of lime and promotes its melting. The amount of limestone added should not be too much, otherwise its endothermic decomposition will cause a significant decrease in the temperature of the molten iron, and at the same time, it will also lead to a significant increase in the slag basicity. The higher content of CaO leads to an increase in the slag melting temperature, an increase in the mass percentage of the solid phase slag, and a high slag viscosity. The problem of sticking to the tank mouth cannot be solved. In addition, excessive decomposition of limestone may also cause slag overflow. Exemplarily, the mass of limestone can be 15%, 16%, 17%, 18%, 19%, 20%, etc. of the mass of the second batch of lime.

[0065] The method for controlling residue sticking to the mouth of a torpedo tank provided in the embodiment of the present 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, the composition and performance of the slag are precisely regulated according to the composition of the molten iron, the iron-containing resources, the composition of the blast furnace slag, and the requirements for the slag alkalinity. The high-viscosity slag after the torpedo tank is equipped with iron-containing resources is transformed into low-viscosity slag, solving the problem of slag sticking to the tank mouth when pouring molten iron into the ladle.

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

[0068] (3) Energy saving, emission reduction and environmental protection: This method reduces resource waste and waste emissions by recycling iron-containing resources and accurately controlling the amount of smelting auxiliary materials such as lime. In addition, the second batch of lime is stirred by adding CO2 gas produced by limestone, which promotes its melting.

[0069] (4) Flexibility and adaptability: The 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 enables the method to be widely used in different types of steel enterprises and smelting processes.

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

[0071] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

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

[0073] Example 1

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

[0075] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0077] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0080] Example 2

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

[0082] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0084] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0087] Example 3

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

[0089] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0091] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0094] Comparative Example 1

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

[0096] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0098] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0101] Comparative Example 2

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

[0103] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0105] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0108] Comparative Example 3

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

[0110] 2) Iron resources should be added when the torpedo tank has reached 1 / 3 of its iron content;

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

[0112] 4) The first batch of lime is added when the torpedo tank has reached 2 / 3 of the iron content;

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

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

[0115] The application effect of the method described in the embodiment of the present application is characterized by the service life of the refractory material of the torpedo tank mouth insulation cover and whether there is slag overflow during the operation of the torpedo tank, and the characterization results are shown in Table 1. As the degree of slag sticking to the torpedo tank mouth increases, the resistance to slag sticking to the torpedo tank mouth insulation cover during opening and closing increases, the erosion of the refractory material increases, and the service life decreases. Therefore, the service life of the refractory material of the torpedo tank mouth insulation cover can be used to characterize the control effect of slag sticking to the torpedo tank; specifically, the number of turnovers of the torpedo tank after replacing the refractory material of the insulation cover is used as a quantitative indicator.

[0116] Table 1 Characterization results of the torpedo tank mouths of the embodiments and comparative examples

[0117]

[0118] As can be seen from Table 1, the methods for controlling slag sticking to the mouth of the torpedo tank provided in Examples 1 to 3, the service life of the refractory material of the thermal insulation cover of the mouth of the torpedo tank are significantly greater than that of the comparative example, indicating that the method of this patent has a good effect of controlling slag sticking to the mouth of the tank; because the amount of iron-containing resources added and the amount of iron received by the torpedo tank corresponding to Examples 1, 2, and 3 gradually increase, the corresponding amount of slag increases, and the erosion of the refractory material of the thermal insulation cover of the mouth of the tank is aggravated. Therefore, the service life of the refractory material of the thermal insulation cover of the mouth of the torpedo tank corresponding to Examples 1, 2, and 3 shows a decreasing trend. Comparative Example 1 has low control of slag alkalinity and high viscosity, resulting in slag sticking to the mouth of the tank; Comparative Examples 2 to 3 have large amounts of iron-containing resources added and the amount of iron received by the torpedo tank, resulting in frequent slag overflow, which adheres to the mouth of the tank, resulting in a decrease in the service life of the refractory material of the thermal insulation cover.

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

[0120] In the embodiment of the present application, the high-viscosity slag after the torpedo tank is equipped with iron-containing resources is modified into low-viscosity slag by adding lime and limestone, thereby solving the problem of slag sticking to the mouth of the torpedo tank after consuming iron-containing resources and ensuring the recovery of iron-containing resources.

[0121] In the embodiments of the present application, a mathematical model for calculating the amount of lime added is constructed to achieve precise control of the amount of slag modifier added, taking into account key factors such as the amount of iron received by the torpedo tank and 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.

[0122] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for controlling residue sticking to the mouth of a torpedo tank, the method comprising: The amount of lime added in the first batch is determined based on the set value of the iron amount in the torpedo tank and the composition of the molten iron, the amount and composition of the iron-containing resources added, and the amount and composition of the slag from the blast furnace; Mixing the second batch of lime with limestone to obtain a mixed material; Connecting iron to the torpedo tank, and adding iron-containing resources and the first batch of lime to the torpedo tank respectively under set adding timing conditions; After the torpedo tank is connected with iron, the mixed material is added into the torpedo tank to further modify the slag.

2. The method according to claim 1, characterized in that The step of adding the iron-containing resource and the first batch of lime to the torpedo tank under the set addition timing conditions comprises: When the iron content of the torpedo tank is within the range of 1 / 10 to 1 / 3, adding iron-containing resources into the torpedo tank; When the iron content of the torpedo tank is in the range of 1 / 3 to 2 / 3, the first batch of lime is added to the torpedo tank.

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

4. The method according to claim 2, characterized in that: The amount of lime added in the first batch satisfies the following relationship: In the formula, X1 represents the amount of lime added in the first batch, F represents the amount of iron-containing resources added, and F SiO2 represents the mass ratio of SiO2 in iron-containing resources, S represents the amount of slag in the blast furnace, and S SiO2 represents the mass ratio of SiO2 in blast furnace slag, T represents the set value of iron intake, [Si] represents the [Si] content of molten iron, O[Si] represents the [Si] oxidation ratio, B represents the slag basicity, L1 represents the mass ratio of CaO in the first batch of lime, F CaO Indicates the mass ratio of CaO in iron-bearing resources, S CaO Indicates the mass ratio of CaO in iron-containing resources and blast furnace slag.

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

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

7. The method according to claim 6, characterized in that The actual iron receiving amount is 90% to 93% of the torpedo tank capacity.

8. The method according to claim 4 or 6, characterized in that: The slag basicity is 1.2 to 1.

6.

9. The method according to claim 4 or 6, characterized in that: The iron receiving amount setting value is 90% of the torpedo tank capacity.

10. 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.

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