A KR molten iron pretreatment efficient slag skimming device, a slag skimming system and a slag skimming method

Abstract

The present application provides a kind of KR molten iron pretreatment efficient slagging device, slagging system and slagging method, belongs to the technical field of steelmaking, obtains molten iron information;Measure slag layer thickness and iron slag amount;Stirring head is stretched into ladle and is stirred, and desulfurizer is added to carry out desulfurization pretreatment;After desulfurization pretreatment, ladle is inclined to the angle of slagging;According to the weight of iron slag, molten iron temperature, slagging process requirement, combined with slagging process parameters, start slagging machine and stretch into the arm of slagging machine in ladle, and carry out slagging operation;Start pre-blowing slagging mode, and drive the iron slag out of the edge of ladle to the center of ladle;Combined with visual detection device, according to the driving condition of liquid surface iron slag, switch to post-blowing slagging mode, and carry out slagging;Ladle is hoisted to the next process position.The iron slag in the area near the wall of ladle is driven and removed, and the efficiency of slagging is improved, the rapid and efficient separation of slag and iron is realized, and the precise and efficient slagging is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steelmaking, and particularly relates to a KR molten iron pretreatment efficient slag removing device, a slag removing system and a slag removing method. BACKGROUND

[0002] Molten iron pretreatment is of great significance in modern steelmaking and is an indispensable link in optimizing the production process of steelmaking. Currently, there are two common forms, namely, the injection method and the KR method. The latter is widely promoted and applied due to its advantages of good metallurgical kinetic conditions, stable effect, low operation cost, and high efficiency.

[0003] KR mechanical stirring method is a method in which a cross-shaped stirring head made of cast refractory material and subjected to baking is immersed into a molten pool of a ladle to a certain depth, a vortex is generated by rotation of the stirring head, a weighed desulfurizing agent is added to the surface of the molten iron by a feeder, and the vortex is rolled into the molten iron to make the calcium oxide-based desulfurizing powder fully contact and react with the molten iron, thereby achieving the purpose of desulfurization. The method has the advantages of superior kinetic conditions, being conducive to the use of inexpensive desulfurizing agents such as CaO, stable desulfurization effect, high efficiency (desulfurization to ≤0.005%), low desulfurizing agent consumption, and being suitable for steel plants with high requirements for low-sulfur steel varieties.

[0004] The molten iron pretreatment link is extremely important for producing high-quality steel. After the molten iron is desulfurized, the amount of slag in the molten iron entering the converter is increased, which greatly increases the difficulty of converter smelting and the removal pressure of impurities in molten steel, causes large fluctuations in the quality of molten steel, and also increases the loss of molten iron, smelting cost, and affects the smelting time and production rhythm efficiency. Therefore, slag removal is indispensable for stable production of steel. Currently, molten iron slag removal is a key link for controlling the total amount of slag in the molten iron entering the converter, which can not only reduce the total amount of slag in the converter, but also reduce the loss of molten iron, smelting cost, and improve the quality of steelmaking. Therefore, molten iron slag removal has become a necessary process for smelting high-quality steel and is widely used in modern steel enterprises.

[0005] In the production process, the domestic major steel enterprises for the deslagging in the ladle, generally adopt mechanical deslagging method. The basic principle of deslagging method is to tilt the ladle 15-30° to the deslagging equipment direction, under the motor drive of the deslagging equipment, the deslagging mechanism is immersed in the molten iron 50-100mm depth, so that it does curve or straight line movement, the slag on the molten iron surface is removed. However, due to the inclination of the ladle, the deslagging mechanism cannot reach the slag layer on the ladle wall, the deslagging dead zone is formed on the back wall of the ladle, so that the slag on the back wall cannot be removed completely, thereby reducing the deslagging degree and deslagging effect of the desulfurization slag, and increasing the later steelmaking cost; the slagging method is to collect the slag on the molten iron surface by the slagging bucket, then the collected slag is lifted out of the molten iron surface vertically, fully utilizing the good fluidity of the molten iron, 3 times the specific gravity of the slag. Under the action of gravity, the molten iron and slag are separated well, so the slagging method has less iron loss. The collected slag is in loose powder ash state, which shows that the collected slag has little iron.

[0006] The current KR efficient deslagging involves equipment design, process requirements, fixed asset investment, molten iron conditions, cost structure, intelligent level, operation level and other factors, but the ultimate goal is to realize efficient separation of slag-iron under the existing objective environmental conditions, to remove the slag on the molten iron surface in the ladle completely, and to remove as little molten iron as possible to avoid metal loss caused by iron loss during deslagging.

[0007] For the KR treatment process, in order to achieve the effect of efficient desulfurization, the process mode of deslagging before deslagging → stirring desulfurization pretreatment → deslagging after deslagging is generally adopted. Since the pre-ladle slag is generally the slag from the blast furnace, due to the long time cooling and the characteristics of the slag itself, the slag is generally in large block shape and is easy to be removed. In the KR stirring desulfurization process, in order to increase the contact area between the desulfurizer and the molten iron, a small particle desulfurizer is used, then the desulfurizer is fully dissolved with the molten iron under the action of the stirring head to achieve the effect of desulfurization. After stirring, the small particle desulfurization product must be removed due to its high sulfur content to reduce the sulfur content in the converter, i.e. the so-called deslagging after deslagging operation. However, due to the small particle size of the slag, the deslagging difficulty is great, so it is necessary to extend the deslagging time to achieve a certain brightness, but this operation is easy to cause a large amount of molten iron to be removed together during the deslagging process, resulting in increased iron consumption and decreased metal yield.

[0008] It can be seen that, no matter is the slag, fishing or blowing slag, the biggest problem is the inner wall of the ladle and the edge area of the molten iron liquid in the ladle, the slagging, fishing device instrument function is limited, at the same time, due to the heat absorption of the ladle wall material, the temperature is relatively low, the slag viscosity increases, which leads to the iron slag in this area can not be removed well, which affects the deslagging effect and efficiency. SUMMARY

[0009] The application provides a KR molten iron pretreatment efficient slagging device, which improves the slagging efficiency, avoids the iron carrying of slagging, reduces the metal loss, realizes the rapid and efficient separation of slag-iron and precise and efficient slagging.

[0010] The slagging device comprises a slagging mechanism, a gas source built-in pipe is arranged in the slagging mechanism, a gas source built-in pipe joint is connected to the gas source built-in pipe, the gas source built-in pipe joint extends to the outside of the slagging mechanism, and a metal hose is connected to the gas source built-in pipe joint;

[0011] A plurality of first rear-positioned blowing slagging nozzles are arranged on the slagging mechanism.

[0012] One end of the slagging mechanism is connected to a connecting plate, and a connecting hole is arranged on the connecting plate.

[0013] It should be further explained that the gas source built-in pipe is provided with a first main pipe and a second main pipe communicated with the first main pipe.

[0014] One end of the first main pipe is connected to the gas source built-in pipe joint.

[0015] A plurality of second front-positioned blowing slagging nozzles are arranged on the second main pipe, and the second front-positioned blowing slagging nozzles are connected to first built-in branch pipes.

[0016] A plurality of second rear-positioned blowing slagging nozzles are arranged on the end of the second main pipe, and the second rear-positioned blowing slagging nozzles are connected to second built-in branch pipes.

[0017] It should be further explained that a plurality of first front-positioned blowing slagging nozzles are arranged on the slagging mechanism.

[0018] It should be further explained that a plurality of rib plates are arranged on the slagging mechanism.

[0019] The gas source built-in pipe is arranged on one side close to the connecting plate.

[0020] It should be further explained that a metal hose joint is connected to the end of the metal hose.

[0021] According to another embodiment of the application, a KR molten iron pretreatment efficient slagging system is provided, comprising a molten iron ladle, a slagging machine arm and a slagging device.

[0022] One end of the slag spitting machine arm is fixedly connected with the connecting plate of the slag spitting device;

[0023] The end of the slag spitting machine arm connected with the slag spitting device extends to the molten iron inside the ladle, and blowing is performed to drive the slag.

[0024] It is further needed to be explained that the industrial computer and the database are further included; the database stores the iron-making process information and the historical ladle iron information;

[0025] The upper part of the ladle is provided with a visual detection device;

[0026] The industrial computer acquires the slag layer thickness measured on the molten iron liquid surface in the ladle, and calculates the iron slag amount according to the slag layer thickness and the inner diameter of the ladle; the total slag amount of the current ladle is obtained by calculating the iron slag increase amount after the desulfurizer addition amount according to the historical ladle iron information;

[0027] The industrial computer acquires the iron slag image information of the molten iron inside the ladle by connecting with the visual detection device, and starts the slag spitting blowing control process during the slag spitting process, and drives and spits the iron slag in the ladle wall area through the slag spitting machine arm and the slag spitting device.

[0028] It is further needed to be explained that the industrial computer collects the historical ladle iron information of the historical ladle, and establishes the historical ladle information dataset;

[0029] The slag spitting blowing control process under various same or similar molten iron liquid surface height and slag layer thickness conditions is obtained by comparative analysis and classification of the slag spitting iron carrying situation and the slag spitting effect during the slag spitting process.

[0030] According to another embodiment of the present application, a KR molten iron pretreatment efficient slag spitting method is also provided, the method comprising:

[0031] S101: acquiring the historical ladle iron information and the current ladle iron information;

[0032] S102: transporting the ladle to the KR pretreatment working position, measuring the slag layer thickness on the molten iron liquid surface in the ladle, and calculating the iron slag amount according to the slag layer thickness and the inner diameter of the ladle;

[0033] S103: calculating the desulfurizer addition amount, the stirring time, the stirring head stirring speed, the stirring head insertion depth and the treatment time information according to the target sulfur content of the steel grade and the iron-making process information;

[0034] S104: extending the stirring head into the ladle for stirring, and adding the desulfurizer for desulfurization pretreatment;

[0035] S105: after the desulfurization pretreatment is completed, the ladle is inclined to a slag spitting angle;

[0036] S106: According to the weight of iron slag, the temperature of molten iron, the requirements of slagging process, combined with the slagging process parameters, start the slagging machine to extend the arm into the ladle, and perform the slagging operation;

[0037] S107: Start the front blowing slagging mode, and drive the iron slag at the edge of the ladle to the center of the ladle;

[0038] S108: Combined with the visual detection device, according to the driving condition of the liquid surface iron slag, switch to the rear blowing slagging mode, and perform the slagging;

[0039] S109: Stop the slagging operation after reaching the requirements of the slagging process;

[0040] S110: Hoist the ladle to the next process position.

[0041] From the above technical solution, the present application has the following advantages:

[0042] The KR molten iron pretreatment efficient slagging system and method disclosed in the present application can accurately control the sulfur content in the molten iron according to the requirements of the smelted steel type through precise desulfurization pretreatment, thereby improving the quality of the molten iron. By calculating the addition amount of the desulfurizer, the stirring time, the stirring speed and other parameters, the optimization control of the desulfurization process is realized, the desulfurization efficiency is improved, the waste of the desulfurizer is reduced, and the production cost is reduced. The KR molten iron pretreatment efficient slagging method effectively reduces the impurity content in the molten iron, especially the residual iron slag, by measuring the slag layer thickness and calculating the iron slag amount, and subsequent slagging operation, which has a positive significance for improving the purity of the molten steel and reducing the slag amount in the smelting process. The present application adopts front and rear blowing slagging modes combined with a visual detection device, which can more accurately control the slagging process, improve the slagging efficiency and accuracy, reduce the loss of molten iron, and ensure the quality of the molten iron after slagging. It also avoids the iron loss caused by slagging and reduces the metal loss, realizes the rapid and efficient separation of slag-iron and precise and efficient slagging. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0044] Fig. 1 It is a schematic diagram of the KR molten iron pretreatment efficient slagging device;

[0045] Fig. 2 It is a schematic diagram of the KR molten iron pretreatment efficient slagging device;

[0046] Fig. 3A schematic diagram of the built-in nozzle arrangement of the slag skimming device;

[0047] Fig. 4 A schematic diagram of the KR molten iron pretreatment high-efficiency slag skimming system;

[0048] Fig. 5 A schematic diagram of the front blowing slag removal method;

[0049] Fig. 6 A schematic diagram of the rear blowing slag removal method;

[0050] Fig. 7 A flowchart of the KR molten iron pretreatment high-efficiency slag skimming method embodiment.

[0051] Explanation of reference signs:

[0052] 1 - slag skimming mechanism, 2 - connecting hole, 3 - first front blowing slag removal nozzle, 4 - first rear blowing slag removal nozzle, 5 - rib plate, 6 - connecting plate, 7 - gas source built-in pipe joint, 8 - metal hose joint, 9 - metal hose, 10 - gas source built-in pipe, 11 - first built-in branch pipe, 12 - second built-in branch pipe, 13 - ladle, 14 - slag skimming machine arm, 15 - molten iron, 17 - visual detection device, 18 - inner wall of the ladle. DETAILED DESCRIPTION

[0053] The following detailed description of the KR molten iron pretreatment high-efficiency slag skimming device, slag skimming system and slag skimming method relates to specific details such as specific system structures, technologies, etc. for the purpose of illustration, but not for the purpose of limitation, so as to thoroughly understand the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0054] It should be understood that when used in the specification of the present application, the term "comprising" indicates the existence of described features, integers, steps, operations, elements, and / or components, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components, and / or sets thereof. The terms "comprise", "contain", "have" and their variants mean "including but not limited to", unless otherwise specifically emphasized.

[0055] It should be understood that the "one or more" referred to in the present application means one, two or more than two, and the "multiple" referred to in the present application means two or more than two. In the description of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. "And / or" in this paper is only a description of the association between the associated objects, which means that there can be three relationships, such as A and / or B, which means that there are three cases of A alone, A and B together, and B alone.

[0056] In order to clearly describe the technical solutions of the present application, the terms "first", "second" and the like are used to distinguish the same or similar items or parts with basically the same function and role. Those skilled in the art can understand that the terms "first", "second" and the like do not limit the quantity and execution order, and the terms "first", "second" and the like do not necessarily mean different.

[0057] The phrases "one embodiment" or "some embodiments" or the like appearing in the present application mean that the specific feature, structure or characteristic described in the embodiment is included in one or more embodiments of the present application. Therefore, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" and the like appearing in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized.

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely in the present application with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0059] As shown in Figs. 1 to 3 The KR molten iron pretreatment high-efficiency slag removing device provided by the present embodiment includes a slag removing mechanism 1, which is a hollow body. In order to ensure the strength of the slag removing mechanism 1, a plurality of rib plates 5 are installed on the slag removing mechanism 1.

[0060] A gas source built-in pipe 10 is arranged in the slag removing mechanism 1, and the gas source built-in pipe 10 is connected with a gas source built-in pipe joint 7.

[0061] Optionally, the gas source built-in pipe 10 is provided with a first main pipe and a second main pipe in communication with the first main pipe; one end of the first main pipe is connected with the gas source built-in pipe joint 7; a plurality of second front-positioned gas blowing and slag removing nozzles are arranged on the second main pipe, and the second front-positioned gas blowing and slag removing nozzles are connected with a first built-in branch pipe 11; a plurality of second rear-positioned gas blowing and slag removing nozzles are arranged on the end of the second main pipe, and the second rear-positioned gas blowing and slag removing nozzles are connected with a second built-in branch pipe 12. The first built-in branch pipe 11 and the second built-in branch pipe 12 can play a role of blowing gas to remove slag.

[0062] The gas source built-in pipe joint 7 extends to the outside of the slag removing mechanism 1 and is connected with a metal hose 9; and the end of the metal hose 9 is connected with a metal hose joint 8. It is convenient to connect other gas supply pipelines.

[0063] The slagging mechanism 1 is provided with a plurality of first rear blowing slagging nozzles 4; the slagging mechanism 1 is also provided with a plurality of first front blowing slagging nozzles 3. One end of the slagging mechanism 1 is connected with a connecting plate 6, and the connecting plate 6 is provided with a connecting hole 2. The connecting plate 6 can be connected with the slagging machine arm. The gas source built-in pipe 10 of the embodiment is arranged close to one side of the connecting plate 6.

[0064] The KR molten iron pretreatment efficient slagging device provided by the application can simultaneously perform blowing slagging operation on the slag layer on the surface of the molten iron from multiple directions through the built-in gas source built-in pipe and the built-in branch pipe. The device can provide multi-directional and multi-nozzle design, so that the slag layer can be more quickly and completely stripped and removed, thereby significantly improving the slagging efficiency.

[0065] The front and rear blowing slagging nozzle layout of the application can make the gas flow more uniformly cover the surface of the molten iron, reduce dead angles and blind areas, and effectively avoid slag layer residues. The all-around blowing action can help to refine the slag layer and accelerate its separation from the surface of the molten iron, thereby achieving better slagging effect.

[0066] The efficient slagging operation of the device can reduce the residence time of the molten iron in the pretreatment process, and reduce the quality problems and safety hazards of the molten iron that may be caused by excessive and thick slag layer. Through optimization of the structure and blowing mode of the slagging mechanism, the slagging effect can be ensured while reducing energy consumption and production cost.

[0067] Based on the above KR molten iron pretreatment efficient slagging device, as shown in Fig. 4 The application also provides a KR molten iron pretreatment efficient slagging system, which comprises a molten iron ladle 13, a slagging machine arm 14, and a slagging device. One end of the slagging machine arm 14 is fixedly connected with the connecting plate 6 of the slagging device; the end of the slagging machine arm 14 connected with the slagging device extends into the molten iron inside the molten iron ladle 13 to perform blowing slagging.

[0068] The KR molten iron pretreatment efficient slagging system involved in the application is a slagging method for removing slag from the molten iron ladle during production. The basic principle of the slagging method is to tilt the ladle by 15-30° towards the slagging device, and then immerse the slagging mechanism into the molten iron by 50-100 mm under the driving of the motor of the slagging device, so as to make the slag on the surface of the molten iron be removed through curve or straight line movement.

[0069] In one exemplary embodiment, it is considered that the biggest problem of slagging, slagging, and blowing slagging is that the inner wall 18 of the molten iron ladle and the edge area of the molten iron 15 in the molten iron ladle are limited in function, which leads to the problem that the slag in the area cannot be removed well, thereby affecting the slag removal effect and efficiency.

[0070] The total slag amount of the furnace can be calculated according to the slag thickness measured iron slag amount and the iron slag increase amount after the desulfurizer addition amount is calculated in the embodiment, and the total slag amount of the furnace is combined with the visual detection device arranged at the upper portion of the ladle 13 to detect the slagging operation by the special slagging device, the blowing slagging is started in the middle and late stages of the slagging operation, the iron slag near the ladle wall area is driven and removed, the slagging efficiency is improved, the iron is avoided in the slagging operation, the metal loss is reduced, the rapid and efficient separation of the slag-iron and the accurate and efficient slagging are realized.

[0071] According to the embodiment of the present application, the system further comprises an industrial computer and a database; the database stores the iron-making process information and the historical ladle iron information.

[0072] The industrial computer of the embodiment is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors and other similar computing devices. The components shown herein, their connections, and relationships, and their functions, are merely examples and are not intended to limit the implementations of the embodiments of the present application described and / or claimed herein.

[0073] The network in which the industrial computer is located includes but is not limited to the Internet, a wide area network, a metropolitan area network, a local area network, a virtual private network (VPN), etc.

[0074] Optionally, the visual detection device 17 arranged at the upper portion of the ladle 13 can be an LS-IPK 15 camera, or a fluorite C6C wireless network high-definition monitor camera.

[0075] In some embodiments, the industrial computer acquires the slag layer thickness on the molten iron liquid surface measured, and calculates the iron slag amount according to the slag layer thickness and the inner diameter of the ladle; calculates the iron slag increase amount after the desulfurizer addition amount according to the historical ladle iron information, to obtain the total slag amount of the current furnace; the industrial computer acquires the iron slag image information of the molten iron in the ladle 13 by connecting with the visual detection device 17, and starts the slagging blowing control process in the slagging process, and drives and removes the iron slag in the ladle wall area by the slagging machine arm 14 and the slagging device.

[0076] In some specific embodiments, the industrial computer collects the historical ladle iron information of the historical ladle, establishes a historical ladle information data set; compares and analyzes the slagging iron situation and the slagging effect in the slagging process, and classifies to obtain the slagging blowing control process under various same or similar molten iron liquid surface height and slag layer thickness conditions.

[0077] According to the embodiments of the present application, the KR molten iron pretreatment efficient slagging system disclosed by the present application comprises a slagging mechanism, a front blowing slagging nozzle, a rear blowing slagging nozzle, a connecting plate, a gas source built-in pipe joint, a gas source built-in pipe, a slagging mechanism arm and an industrial computer, and the components are used in cooperation. The molten iron ladle 13 can be inclined at a certain angle. For example, the front blowing slagging nozzle is arranged at an angle of 30° with the liquid surface of the molten iron 15. The rear blowing slagging nozzle can be arranged at an angle of 20° with the liquid surface of the molten iron 15. The sweeping gas can be nitrogen.

[0078] In an example embodiment, when performing a job, the relevant information of a historical heat, such as the service life of the molten iron ladle, the erosion of the refractory of the molten iron ladle, the weight of the molten iron and the slag after pretreatment, the liquid level height in the molten iron ladle, the control depth of the slagging mechanism and the running speed of the slagging mechanism, and the like, can be collected to establish a historical heat information database. The slagging with iron condition and the slagging effect in the slagging process are compared and analyzed, and classified, to obtain the best operating parameters under various conditions of the same or similar liquid level height and slag layer thickness, which are maintained in the database and can be used for subsequent operation control process.

[0079] The following is an embodiment of the KR molten iron pretreatment efficient slagging method provided by the embodiments of the present disclosure. The method and the KR molten iron pretreatment efficient slagging system of each embodiment described above belong to the same inventive concept. Details not described in the embodiment of the KR molten iron pretreatment efficient slagging method can be referred to the embodiments of the KR molten iron pretreatment efficient slagging system described above.

[0080] As shown in Figs. 5 to 7 , the method comprises:

[0081] S101: Obtain the historical heat molten iron information and the current heat molten iron information. The molten iron information can include the molten iron temperature, weight and composition. The main elements in the molten iron include the contents of C, Si, Mn, P, S and the like. For the molten iron ladle information, the molten iron ladle number, service life, state and the like can be involved.

[0082] S102: Transport the molten iron ladle to the KR pretreatment working position, measure the slag layer thickness on the liquid surface of the molten iron in the molten iron ladle, and calculate the slag amount according to the slag layer thickness and the inner diameter of the molten iron ladle.

[0083] S103: According to the target sulfur content of the smelted steel grade and the ironmaking process information, calculate the addition amount of desulfurizer, stirring time, stirring head stirring speed, stirring head insertion depth and treatment time information.

[0084] S104: Insert the stirring head into the molten iron ladle for stirring, and add the desulfurizer for desulfurization pretreatment.

[0085] S105: After the desulfurization pretreatment is completed, the molten iron ladle is inclined to the slagging angle.

[0086] S106: According to the weight of iron slag, the temperature of molten iron, the requirements of slagging process, and combined with the parameters of slagging process, the slagging machine is started to extend the arm into the ladle to perform the slagging operation.

[0087] S107: Start the pre-blowing slagging mode to drive the iron slag at the edge of the ladle to the center of the ladle.

[0088] S108: Combined with the visual detection device, according to the driving condition of the liquid surface iron slag, switch to the post-blowing slagging mode and perform the slagging.

[0089] S109: After reaching the requirements of the slagging process, stop the slagging operation.

[0090] S110: The ladle is hoisted to the next process position.

[0091] After the above process is executed, the specific parameters can be adjusted, the related parameters in the above process are optimized, the slagging efficiency is improved, the iron carrying during slagging is avoided, the metal loss is reduced, the rapid and efficient separation of slag and iron is realized, and the precise and efficient slagging is realized.

[0092] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0093] The KR molten iron pretreatment efficient slagging method disclosed in the present application can accurately control the sulfur content in the molten iron according to the requirements of the steel grade, thereby improving the quality of the molten iron. By calculating the addition amount of desulfurizing agent, stirring time, stirring speed and other parameters, the desulfurization process is optimized and controlled, the desulfurization efficiency is improved, and the waste of desulfurizing agent is reduced, thereby reducing the production cost. The KR molten iron pretreatment efficient slagging method measures the thickness of the slag layer and calculates the amount of iron slag, and then performs the slagging operation, which effectively reduces the impurity content in the molten iron, especially the residual iron slag, which has a positive significance for improving the purity of the molten steel and reducing the amount of slag in the smelting process. The pre-blowing and post-blowing slagging modes are adopted in the present application, combined with the visual detection device, the slagging process can be more accurately controlled, the slagging efficiency and accuracy are improved, the loss of molten iron is reduced, and the quality of the molten iron after slagging is ensured.

[0094] The KR hot metal pretreatment efficient slagging method related in the present application is the unit and algorithm steps of each example described in combination with the embodiments disclosed in the present application, which can be realized by electronic hardware, computer software or combination of both. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description in terms of functions. Whether the functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0095] Those skilled in the art can understand that each aspect of the KR hot metal pretreatment efficient slagging method related in the present application can be realized as a system, a method or a program product. Therefore, each aspect of the present disclosure can be embodied as a whole hardware embodiment, a whole software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, which can be collectively referred to as "circuitry", "module" or "system" here.

[0096] The terms "first", "second", "third", "fourth" and the like in the description of the present application and claims, and the above-mentioned drawings (if any) are used to distinguish similar objects, and do not necessarily have to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0097] The above description of the disclosed embodiments enables a person skilled in the art to implement or use 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 these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency slag skimming device for KR molten iron pretreatment, characterized in that, It comprises: The slagging mechanism (1) is internally provided with a gas source built-in pipe (10), the gas source built-in pipe (10) is connected with a gas source built-in pipe joint (7), the gas source built-in pipe joint (7) extends to the outside of the slagging mechanism (1), and is connected with a metal hose (9); A plurality of first rear-positioned blowing slagging spout holes (4) are formed on the slagging mechanism (1); One end of the slagging mechanism (1) is connected with a connecting plate (6), and a connecting hole (2) is formed on the connecting plate (6); The gas source built-in pipe (10) is provided with a first main pipe and a second main pipe in communication with the first main pipe; One end of the first main pipe is connected with the gas source built-in pipe joint (7); A plurality of second front-positioned blowing slagging spout holes are formed on the second main pipe, and the second front-positioned blowing slagging spout holes are connected with first built-in branch pipes (11); A plurality of second rear-positioned blowing slagging spout holes are formed on the end of the second main pipe, and the second rear-positioned blowing slagging spout holes are connected with second built-in branch pipes (12); A plurality of first front-positioned blowing slagging spout holes (3) are further formed on the slagging mechanism (1).

2. The KR hot metal pretreatment efficient slagging device according to claim 1, characterized in that: A plurality of rib plates (5) are installed on the slagging mechanism (1).

3. The KR hot metal pretreatment efficient slagging device according to claim 1, characterized in that: The gas source built-in pipe (10) is arranged on one side close to the connecting plate (6).

4. The KR hot metal pretreatment efficient slagging device according to claim 1, characterized in that: A metal hose joint (8) is connected to the end of the metal hose (9).

5. A high-efficiency slag skimming system for KR molten iron pretreatment, characterized in that, It comprises: A hot metal ladle (13), a slagging machine arm (14), and the slagging device according to any one of claims 1 to 4; One end of the slagging machine arm (14) is fixedly connected with the connecting plate (6) of the slagging device; The end of the slagging machine arm (14) connected with the slagging device extends to the inside of the hot metal in the hot metal ladle (13) to blow and slag.

6. The KR hot metal pretreatment high efficiency slag skimming system according to claim 5, characterized in that, It further comprises: An industrial computer and a database; The database stores ironmaking process information and historical hot metal information of a furnace period; A visual detection device (17) is arranged on the upper part of the hot metal ladle (13); The industrial computer acquires the slag layer thickness on the liquid surface of the hot metal measured, and calculates the iron slag amount according to the slag layer thickness and the inner diameter of the hot metal ladle; calculates the iron slag increase amount after the addition amount of desulfurizer is calculated according to the historical hot metal information of a furnace period, to obtain the total slag amount of the current furnace period; The industrial computer acquires the iron slag image information of the hot metal in the hot metal ladle (13) by being connected with the visual detection device (17), and starts the slagging blowing control process during the slagging process, and drives and removes the iron slag in the hot metal ladle wall area through the slagging machine arm (14) and the slagging device.

7. The KR hot metal pretreatment efficient slagging system according to claim 6, characterized in that: The industrial computer collects the historical hot metal information of a furnace period, and establishes a historical furnace period information data set; The slagging and iron carrying situation and the slagging effect during the slagging process are compared and analyzed, and are classified, to obtain the slagging blowing control process under various same or similar hot metal liquid surface height and slag layer thickness conditions.

8. A high-efficiency slag skimming method for KR molten iron pretreatment, characterized by, The method adopts the KR molten iron pretreatment high-efficiency slagging-off system according to any one of claims 5 to 7; the method comprises: S101: obtaining historical molten iron information and current molten iron information; S102: transporting the ladle to a KR pretreatment working position, measuring the slag layer thickness on the molten iron liquid surface in the ladle, and calculating the iron slag amount according to the slag layer thickness and the inner diameter of the ladle; S103: calculating the desulfurizer addition amount, stirring time, stirring head stirring speed, stirring head insertion depth and treatment time information according to the target sulfur content of the steel grade and ironmaking process information; S104: inserting the stirring head into the ladle for stirring and adding the desulfurizer for desulfurization pretreatment; S105: after the desulfurization pretreatment is completed, the ladle is tilted to a slagging-off angle; S106: according to the iron slag weight, molten iron temperature, slagging-off process requirements and combined with the slagging-off process parameters, the slagging-off machine arm is inserted into the ladle to perform the slagging-off operation; S107: starting the front blowing slagging-off mode to drive the iron slag at the edge of the ladle to the center of the ladle; S108: combined with the visual detection device, according to the driving condition of the liquid surface iron slag, switching to the rear blowing slagging-off mode and performing the slagging-off; S109: after the slagging-off process requirements are met, stopping the slagging-off operation; S110: hoisting the ladle to the next process position.

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