Environment-friendly pre-melting type semi-steel slagging material
By embedding a skeleton into the slag block, the high cost of XG-type slag-forming agent and manganese slag is solved, achieving efficient slag block dispersion and slag-forming agent use, reducing steelmaking costs and maintaining environmental friendliness.
Patent Information
- Application Number
- CN202422846852.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Existing XG-type slagging agents have poor slagging effect and high cost in the steelmaking process. Although using manganese slag as a substitute improves efficiency, it also increases production costs.
Environmentally friendly pre-melted semi-steel slag material is used. By implanting a skeleton into the slag block, the low melting point of the skeleton is used to promote the rapid disintegration of the slag block. The slag block is also combined with iron-based or iron oxide materials to improve the dispersion efficiency of the slag block in the semi-steel and reduce the amount of manganese slag used.
It improves slag-making efficiency and the effective utilization rate of slag agents, reduces the production cost of converter process, and maintains environmental protection.
Smart Images
Figure CN223866699U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of auxiliary materials for converter steelmaking, and in particular to an environmentally friendly pre-melted semi-steel slag-forming material. Background Technology
[0002] In the converter process of some traditional steelmaking plants, XG type slagging agent (the composition is shown in Table 1 - XG type slagging agent composition) is selected. However, in terms of slagging effect, the use of XG type slagging agent has obvious disadvantages such as poor effect on sulfur, phosphorus and other components in semi-steel, and low slagging efficiency.
[0003] Table 1 – Composition of XG-type slagging agent, %
[0004]
[0005] In response to the shortcomings of the XG-type slag-forming agent in terms of slag-forming effect, some existing steel plants have used higher-priced manganese slag (whose composition is shown in Table 2 - Manganese Slag Composition) as a new type of slag-forming agent to replace the traditional XG-type slag-forming agent.
[0006] Table 2 – Composition of manganese slag, %
[0007] <![CDATA[SiO2]]> CaO MgO MnO <![CDATA[Al2O3]]> <![CDATA[H2O]]> P S TFe 30.73 19.27 5.63 5.86 27.37 11.98 0.003 1.09 ＜0.10
[0008] In terms of slag-forming effect, manganese slag contains some residual manganese, which can promote the slag-forming reaction during converter smelting, significantly accelerating the slag-forming rate in the test heats. Compared with the use of XG-type slag-forming agent, the slag-forming time was shortened by about 20 seconds, improving production efficiency. Simultaneously, manganese slag, mainly through the combined action of oxidizing and reducing agents, effectively reduces the content of harmful components such as sulfur and phosphorus during steelmaking, further improving the quality of molten steel.
[0009] However, due to the cost of manganese slag, using manganese slag as a slag-forming agent will greatly increase the production cost of the converter. In particular, in order to ensure the consistency of slag formation in the semi-steel parts of the converter, a large amount of manganese slag needs to be added, which will make the economic efficiency of the converter process worse and increase the cost of steelmaking. Utility Model Content
[0010] In view of the above problems, this utility model is proposed to provide an environmentally friendly pre-melted semi-steel slag-forming material that overcomes or at least partially solves the above problems, and can solve the problem of high cost of existing manganese slag as a slag-forming agent, thereby achieving the goal of reducing steelmaking costs.
[0011] Specifically, this utility model provides an environmentally friendly pre-melted semi-steel slag-forming material, comprising:
[0012] Slag blocks pre-melted from manganese slag material;
[0013] A skeleton made of iron-based material or iron oxide material, the skeleton passing through at least the center of the slag block and exposed from the surface of the slag block.
[0014] Preferably, the slag block is rugby ball shaped, and the skeleton passes through at least along the short axis of the slag block.
[0015] Preferably, the skeleton is a rod-shaped extension in the shape of a straight line, and it has a thick diameter section at both ends and a thin diameter section in the middle, wherein the diameter of the thick diameter section is larger than the diameter of the thin diameter section.
[0016] Preferably, the length of the coarse diameter section is 3-4 times the length of the fine diameter section, and the coarse diameter section and the fine diameter section transition via a conical portion.
[0017] Preferably, the skeleton has three or more rods extending from the center of the slag block toward its surface, the three or more rods being radially distributed about the center of the slag block, and each rod being spatially misaligned relative to the other.
[0018] Preferably, the inner end of each of the rods is located at the center of the slag block, and the outer end extends to the surface of the slag block; and a cap portion protruding from the surface of the slag block is integrally formed at the outer end of each of the rods, the diameter of the cap portion being larger than the diameter of the rod portion, so as to cause the inner end face of the cap portion to adhere to the outer surface of the slag block.
[0019] Preferably, the cap is a truncated cone shape coaxial with the rod, and its large end is attached to the outer surface of the slag block.
[0020] Preferably, the environmentally friendly pre-melted semi-steel slag-forming material further includes:
[0021] The plastic coating layer covering the slag block and the skeleton has a thickness of 2-3 mm and is composed of polyethylene, polypropylene or polycarbonate.
[0022] Preferably, the ratio of the volume of the skeleton to the volume of the slag block is 1:6 to 1:8.
[0023] Preferably, when the frame is made of iron-based material, the frame is made of rebar.
[0024] The beneficial effects of this utility model are:
[0025] This utility model of environmentally friendly pre-melted semi-steel slag-forming material employs a skeleton embedded within the slag block. This skeleton allows manganese slag to adhere to the material, facilitating rapid heat transfer to the center of the slag block after it is fed into the converter. Furthermore, the skeleton itself, with a melting point lower than most materials in the slag block (e.g., SiO2, CaO), melts first, further accelerating the disintegration of the slag block from the center outwards. This allows the effective components of the slag to be rapidly and widely dispersed into the semi-steel, thereby improving slag-forming efficiency and the effective utilization rate of the slag-forming agent. This reduces the amount of manganese slag used, thus lowering the production cost of the converter process. Simultaneously, the iron-based or iron oxide materials used in the skeleton are similar in composition to the semi-steel, thus avoiding the introduction of new harmful components and achieving a green and environmentally friendly effect.
[0026] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description
[0027] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:
[0028] Figure 1 This is a schematic structural diagram of the environmentally friendly pre-melted semi-steel slag-forming material according to the first embodiment of this utility model;
[0029] Figure 2 This is a schematic structural diagram of the environmentally friendly pre-melted semi-steel slag-forming material according to the second embodiment of this utility model;
[0030] Figure 3 This is a schematic structural diagram of the environmentally friendly pre-melted semi-steel slag-forming material according to the third embodiment of this utility model.
[0031] in:
[0032] Slag block - 100, skeleton - 200, coarse diameter section - 211, fine diameter section - 212, conical part - 213, rod part - 221, cap part - 222, plastic coating layer - 300. Detailed Implementation
[0033] The following reference Figures 1 to 3This description describes an environmentally friendly pre-melted semi-steel slag-forming material according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.
[0034] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0037] In the converter process, the main functions of pre-melted manganese slag as a slagging agent are to provide a site for redox reactions, control temperature and chemical composition, and promote manganese reduction and sulfur removal. Specifically, pre-melted manganese slag typically contains manganese oxide (MnO) and silicon oxide (SiO2). During the converter process, adding pre-melted manganese slag helps increase the viscosity of the slag melt, reduces the fluidity of the slurry, and makes it easier for the metal and slag melt to form stratification, facilitating smooth tapping of the metal. Furthermore, the manganese oxide in the pre-melted manganese slag can react with sulfur to form sulfur oxides, which helps reduce the sulfur content in the metal, thereby improving the quality of the steel; while manganese oxide can be reduced to manganese metal at high temperatures, helping to increase the manganese content of the alloy. In summary, the role of pre-melted manganese slag in the converter process includes promoting reduction reactions, controlling temperature and composition, and improving metal quality, making it an important slagging agent.
[0038] Pre-melted manganese slag is a material specifically used as a slagging agent in the steelmaking process, and is typically manufactured through the following steps:
[0039] Raw material preparation: The raw materials for manufacturing pre-melted manganese slag typically include manganese- and silicon-containing materials, such as high-manganese ore and silicomanganese ore. These raw materials need to undergo crushing, screening, and other treatments to ensure that they meet the particle size requirements for production.
[0040] Mixing: Raw materials with the required manganese and silicon content are mixed evenly in a certain ratio to ensure that the chemical composition and properties of the final product meet the requirements.
[0041] Slag-forming agent formulation: The formulation of pre-melted manganese slag, including additives, is determined based on specific process requirements and conditions during steelmaking.
[0042] Sintering: The mixed raw materials are fed into sintering equipment for sintering. During the sintering process, under high temperature conditions, the raw material particles undergo physical and chemical changes, forming a solid granular structure.
[0043] Cooling: The pre-melted manganese slag after sintering needs to be cooled to ensure the stability of the slag material's texture and properties.
[0044] Packaging: Finally, the prepared pre-melted manganese slag is packaged and stored for later use.
[0045] Manufacturing pre-melted manganese slag requires strict control of parameters such as raw material quality, proportioning ratio, and sintering process to ensure that the final product meets the requirements of the steelmaking process, thereby effectively leveraging the role of the slag-forming agent.
[0046] The aforementioned manufacturing and application of pre-melted manganese slag are common knowledge in the prior art and will not be repeated in the embodiments of this utility model's environmentally friendly pre-melted semi-steel slag material. This utility model's environmentally friendly pre-melted semi-steel slag material is a utility model concept that improves the structure of environmentally friendly pre-melted semi-steel slag material. The structure of this utility model's environmentally friendly pre-melted semi-steel slag material will be specifically described below.
[0047] like Figure 1 As shown in some embodiments of the environmentally friendly pre-melted semi-steel slag material of this utility model, the environmentally friendly pre-melted semi-steel slag material is mainly composed of slag blocks 100 and a skeleton 200. The slag blocks 100 are made of manganese slag material prepared by the above-mentioned pre-melting process. The skeleton 200 is made of iron-based material or iron oxide material, and it passes through the center of the slag blocks 100 and is exposed from the surface of the slag blocks 100.
[0048] In the above embodiments, iron-based materials are materials with iron as the main component, typically containing iron, carbon, and other alloying elements. Depending on their composition and processing methods, iron-based materials can be classified into various types, including but not limited to:
[0049] Steel is an alloy material containing iron and carbon, with a carbon content typically between 0.2% and 2.1%. Based on the carbon content, steel can be further classified into low-carbon steel, medium-carbon steel, and high-carbon steel, possessing excellent mechanical and machinability properties.
[0050] Cast iron is an iron-based alloy material containing a high carbon content (usually exceeding 2.1%). Depending on its composition and processing methods, cast iron can be classified into gray cast iron, ductile cast iron, and white cast iron, among others, and possesses good casting properties and wear resistance.
[0051] Alloy steel is an iron-based material whose properties are altered by adding different alloying elements (such as chromium, nickel, and molybdenum). Alloy steel possesses excellent strength, corrosion resistance, and heat resistance, and is commonly used in engineering, aerospace, and other fields.
[0052] Stainless steel is an alloy steel with corrosion resistance, typically containing elements such as chromium and nickel. It possesses properties such as oxidation resistance, acid resistance, and corrosion resistance, and is widely used in food processing, chemical industry, and construction.
[0053] In addition to the types mentioned above, iron-based materials also include powder metallurgy products and iron-based composite materials. Iron-based materials have wide applications in industrial production and manufacturing, and are an important type of functional material.
[0054] In the above embodiments, iron oxide materials refer to a class of compounds composed of iron and oxygen elements. There are three common types of iron oxide materials: FeO (ferrous oxide), Fe2O3 (iron oxide), and Fe3O4 (magnetite). The properties and applications of these three iron oxide materials are described below:
[0055] FeO (ferrous oxide): FeO is a black crystalline solid, a simple oxide of iron and oxygen, with the chemical formula FeO. FeO is commonly used in ceramics, magnetic materials, and catalysts. In the ceramics industry, FeO can enhance the color and hardness of ceramics; in magnetic materials, FeO is often used to prepare soft magnetic materials; and in catalysts, FeO possesses redox capabilities and can be used to promote chemical reactions.
[0056] Fe2O3 (iron oxide): Fe2O3 is an important iron oxide material, commonly found in red α-Fe2O3 (the common red mineral hematite) and yellow γ-Fe2O3 (pyrite). Fe2O3 is widely used in coatings, ceramics, magnetic materials, abrasives, pigments, cement, and other industries. In coatings and pigments, Fe2O3 is often used as a dye and pigment; in magnetic materials, Fe2O3 is used to prepare strongly magnetic materials; and in cement, Fe2O3 is one of the main components of cement.
[0057] Fe3O4 (magnetite): Fe3O4 is a ferrous metallic crystalline solid, a magnetic material, also known as magnetite. Fe3O4 possesses strong magnetism and is widely used in magnetic materials, magnetic recording materials, and the medical field. In magnetic recording materials, Fe3O4 can be used to prepare storage media such as magnetic tapes and hard disks; in the medical field, Fe3O4 is used in biomedical imaging, magnetic navigation, and other applications.
[0058] In general, iron oxide materials are an important class of functional materials with a variety of applications and wide range of uses.
[0059] Of course, in the above embodiments, the iron-based materials and iron oxide materials can be specially prepared for the environmentally friendly pre-melted semi-steel slag material of this utility model, or they can be recycled from other products or structures, which is to say, they belong to the secondary utilization of waste materials.
[0060] In the preparation of the environmentally friendly pre-melted semi-steel slag material in the above embodiments, a skeleton 200 is first prepared. Then, in the manganese slag sintering process, the skeleton 200 is added to the manganese slag raw material and sintered together with the manganese slag. After the manganese slag cools, the skeleton 200 and the manganese slag are sintered and solidified together, thereby preparing the environmentally friendly pre-melted semi-steel slag material of this utility model.
[0061] When using the environmentally friendly pre-melted semi-steel slag-forming material in the above embodiments for converter steelmaking, after the environmentally friendly pre-melted semi-steel slag-forming material of this utility model is put into the converter, on the one hand, the skeleton 200 will quickly transfer heat to the center of the slag block 100, causing the slag block 100 to disintegrate rapidly; on the other hand, due to the characteristic that the melting point of the skeleton 200 is lower than that of most materials in the slag block 100 (such as SiO2, CaO), the skeleton 200 will melt first, further accelerating the disintegration of the slag block 100 from the center outward, thereby enabling the effective components in the slag block 100 to be rapidly and more widely dispersed into the semi-steel, thereby improving the slag-forming efficiency and the effective utilization rate of the slag-forming agent in the semi-steel, so that the amount of manganese slag can be reduced. Therefore, by reducing the amount of manganese slag, the production cost of the converter process is reduced.
[0062] In some preferred embodiments of this invention, the slag block 100 is rugby-shaped, and the skeleton 200 passes through at least along the short axis of the slag block 100. Because the skeleton 200 in this invention's environmentally friendly pre-melted semi-steel slag material is designed to "remove" the center of the slag block 100, making it easier for the slag block 100 to disintegrate, passing through the short axis of the rugby-shaped slag block 100 allows for an increase in the amount of manganese slag material in the slag block 100. That is, compared to the skeleton 200 extending from the long axis, the content of manganese slag material will be larger, resulting in a higher proportion of effective components and higher efficiency for the same weight of environmentally friendly pre-melted semi-steel slag material.
[0063] In some preferred embodiments of this invention, the skeleton 200 is a rod-shaped extension in a straight line, having a larger diameter section 211 at both ends and a smaller diameter section 212 in the middle, with the diameter of the larger diameter section 211 being larger than the diameter of the smaller diameter section 212. Using a skeleton 200 that combines the major and minor diameters, especially with the minor diameter located at the center of the slag block 100, can further improve the bonding force between the slag block 100 and the skeleton 200, and enhance the stability of the bonded joint.
[0064] In some preferred embodiments of this invention, the length of the coarse diameter section 211 is 3-4 times the length of the fine diameter section 212, and the coarse diameter section 211 and the fine diameter section 212 transition via a conical portion 213. Using a longer short diameter section can further reduce the weight of the skeleton 200 and further increase the proportion of effective components in the manganese slag material.
[0065] In other preferred embodiments of this utility model, such as Figure 2As shown, the skeleton 200 has three or more rods 221 extending from the center of the slag block 100 toward its surface. The three or more rods 221 are radially distributed about the center of the slag block 100, and each rod 221 is spatially offset from the others. This allows the skeleton 200 to be exposed at multiple points on the surface of the slag block 100, which on the one hand accelerates the melting of the skeleton 200, and on the other hand increases the thermal conductivity and heat transfer efficiency of the skeleton 200 into the interior of the slag block 100.
[0066] In some preferred embodiments of this utility model, the inner end of each rod 221 is located at the center of the slag block 100, and the outer end extends to the surface of the slag block 100. Furthermore, a cap 222 is integrally formed at the outer end of each rod 221, protruding from the surface of the slag block 100. The diameter of the cap 222 is larger than the diameter of the rod 221, so that the inner end face of the cap 222 adheres to the outer surface of the slag block 100. In the environmentally friendly pre-melted semi-steel slag material of this utility model, the cap 222 can increase the clamping force on the surface of the slag block 100. On the one hand, this makes the skeleton 200 more firmly bonded to the slag block 100; on the other hand, it can prevent defects such as disintegration and cracking of the surface of the slag block 100 during transportation and storage, further ensuring the integrity of the environmentally friendly pre-melted semi-steel slag material of this utility model.
[0067] In some preferred embodiments of this invention, the cap 222 is a truncated cone shape coaxial with the rod 221, and its large end is attached to the outer surface of the slag block 100. During the storage and transportation of the environmentally friendly pre-melted semi-steel slag material of this invention, in the event of collisions between different environmentally friendly pre-melted semi-steel slag materials, the sharpness of the edge of the cap 222 is reduced, thereby avoiding damage caused by impacts.
[0068] In other preferred embodiments of this utility model, such as Figure 3 As shown, the environmentally friendly pre-melted semi-steel slag-forming material of this utility model also includes a plastic coating layer 300 covering the slag block 100 and the skeleton 200. The thickness of the plastic coating layer is 2-3 mm, and its composition is polyethylene, polypropylene, or polycarbonate. By using a plastic material with low levels of harmful components such as phosphorus and sulfur to form a coating on the outside of the slag block 100 and the skeleton 200, the disintegration of the slag block 100 during transportation and storage can be further prevented, thereby further improving the integrity of the environmentally friendly pre-melted semi-steel slag-forming material of this utility model.
[0069] In a further preferred embodiment of this invention, the volume ratio of the skeleton 200 to the slag block 100 is 1:6 to 1:8. By controlling the volume ratio of the two, the proportion of effective components (manganese slag material) in the environmentally friendly pre-melted semi-steel slag material of this invention can be further guaranteed.
[0070] In a further preferred embodiment of this utility model, when the skeleton 200 is made of iron-based material, the skeleton 200 is made of rebar. The threaded surface of the rebar further enhances the bonding force between the skeleton 200 and the slag block 100, improving the overall integrity of the environmentally friendly pre-melted semi-steel slag-forming material of this utility model.
[0071] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.
Claims
1. An environmentally friendly pre-melted semi-steel slag-forming material, characterized in that, include: Slag blocks pre-melted from manganese slag material; A skeleton made of iron-based material or iron oxide material, the skeleton passing through at least the center of the slag block and exposed from the surface of the slag block; The slag block is rugby ball shaped, and the skeleton passes through at least along the short axis of the slag block; The skeleton is a rod-shaped extension in the shape of a straight line, and it has a thick diameter section at both ends and a thin diameter section in the middle, wherein the diameter of the thick diameter section is larger than the diameter of the thin diameter section. The length of the coarse diameter section is 3-4 times the length of the fine diameter section, and the coarse diameter section and the fine diameter section transition through a conical portion; The skeleton has three or more rods extending from the center of the slag block toward its surface, the three or more rods being radially distributed about the center of the slag block, and each rod being spatially misaligned relative to the other.
2. The environmentally friendly pre-melted semi-steel slag-forming material according to claim 1, characterized in that, The inner end of each of the rods is located at the center of the slag block, and the outer end extends to the surface of the slag block; and a cap portion protruding from the surface of the slag block is integrally formed at the outer end of each of the rods, the diameter of the cap portion being larger than the diameter of the rod portion, so as to cause the inner end face of the cap portion to adhere to the outer surface of the slag block.
3. The environmentally friendly pre-melted semi-steel slag-forming material according to claim 2, characterized in that, The cap is a truncated cone shape coaxial with the rod, and its large end is attached to the outer surface of the slag block.
4. The environmentally friendly pre-melted semi-steel slag-forming material according to claim 1, characterized in that, The environmentally friendly pre-melted semi-steel slag-forming material also includes: The plastic coating layer covering the slag block and the skeleton has a thickness of 2-3 mm and is composed of polyethylene, polypropylene or polycarbonate.
5. The environmentally friendly pre-melted semi-steel slag-forming material according to claim 1, characterized in that, The ratio of the volume of the skeleton to the volume of the slag block is 1:6 to 1:
8.
6. The environmentally friendly pre-melted semi-steel slag-forming material according to claim 1, characterized in that, When the frame is made of iron-based material, the frame is made of rebar.