Carbon-based pressed block, metal packaged block and production method thereof

Abstract

The present invention discloses a carbon-based pressed block, a metal packaged block and a production method thereof, and belongs to the technical field of metal packaged block preparation. The carbon-based pressed block of the present invention is composed of a core material and a shell wrapped on the surface of the core material, the shell comprising oxide powder and aluminum powder, and the core material comprising carbon-based powder. By adding the carbon-based pressed block to the cavity of the metal packaged block, the metal packaged block can quickly provide heat to the molten pool during use, which is beneficial to improving the scrap steel ratio of the molten pool. At the same time, because the fuel is added to the packaged block in the form of a carbon-based pressed block, the fuel is wrapped in the packaged block at a low temperature. After the packaged block is added to the molten pool, the temperature rises, and the carbon-based pressed block breaks at high temperature and disperses into the packaged block, and finally enters the molten steel, avoiding the problem of fuel floating, burning and low yield caused by being directly added to the molten steel together with the scrap steel.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal packaged block preparation, and more specifically, relates to a carbon-based pressed block, a metal packaged block and a production method thereof. Background Art

[0002] In 2021, my country's steel industry produced nearly 300 million tons of scrap steel, and this is projected to increase to over 350 million tons by 2030. This rapidly growing scrap resource will have a significant impact on the steel industry's process structure, steel plant layout, resource consumption, energy consumption, and carbon emissions. For steel mills, with rising prices for iron ore, coke, and scrap steel, they must seek a balance between the two to improve productivity, reduce production costs, and increase economic benefits.

[0003] In the long-process steelmaking process, scrap steel is primarily used in the converter steelmaking stage, where it plays two primary roles: first, serving as a coolant to regulate the converter temperature and achieve thermal balance; second, to increase finished product output. The converter stage prefers heavy scrap, such as thicker materials, which results in higher tapping efficiency. Furthermore, since 2017, with significant profit expansion at steel mills, they have been attempting to increase scrap steel content at all stages to boost production. Before 2017, the scrap steel addition rate in the long-process ranged from 10% to 15%. However, with rising profits, many steel mills have been able to increase the scrap steel addition rate to 20% to 25%, with some reaching 30% to 40%. However, further increases in the scrap steel content have become difficult due to factors such as converter thermal balance.

[0004] my country currently has ample electric furnace production capacity. However, in the EAF steelmaking process, to reduce costs, the majority of scrap used in EAFs is medium-sized scrap and sheared material. This is because EAFs primarily rely on electrodes to melt scrap, and heavy scrap takes a long time to melt, resulting in high costs. Furthermore, EAFs tend to favor high-carbon materials, and full-process steel mills also add a certain percentage of molten iron to the furnace based on economic considerations. According to medium- and long-term plans, the proportion of EAF production will increase to over 15% by 2025, further increasing the scrap ratio. This poses a significant challenge to the heat demand for melt pool melting.

[0005] To further increase the scrap ratio in converter and electric furnace smelting processes, additional heat must be added to the furnace. Current methods for increasing furnace heat include preheating scrap, burning it, and adding fuel. The first two methods require additional equipment and maintenance costs, resulting in low adoption and utilization. Adding fuel, particularly carbon-based materials, is a more common and cost-effective method.

[0006] However, in the past, the way to add carbon-based materials to the converter was to add scrap steel after pouring the slag, and then add the carbon-based materials into the furnace in bulk form in powder or granular form, or add them together with the scrap steel. The way of adding carbon-based materials to the electric furnace is similar. The biggest advantage of this method is that it is easy to operate and low in cost. However, since the carbon-based materials are added in bulk, before they enter the molten pool or burn in the form of carburizing, part of the fuel floats directly to the surface of the molten steel and burns, thereby reducing the yield of the carbon-based materials, and the contribution to the heat in the furnace is limited, resulting in a lot of waste.

[0007] In view of the defects of the above carbon addition methods, the present invention provides a carbon-based pressed block, a metal packaged block and their production method, which effectively adds carbon to the furnace by adding the packaged blocks, thereby increasing the heat in the furnace and improving the scrap steel ratio. Summary of the Invention

[0008] 1. Problem to be solved

[0009] In response to the defects of the carbon addition method in the above-mentioned background technology, the present invention provides a carbon-based pressed block, a metal packaged block and their production method. By making a new type of carbon-based pressed block and filling the new type of carbon-based pressed block into a metal packaged block, it can effectively add carbon to the furnace when used, thereby increasing the heat in the furnace and improving the scrap steel ratio.

[0010] 2. Technical solution

[0011] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0012] First, the present invention provides a carbon-based pressed block comprising a core material and a shell wrapped around the core material. The core material comprises carbon-based powder, which is directly pressed from the carbon-based powder during preparation. The carbon-based powder can be a carbon-containing fuel, preferably any one of carbon powder, graphite, coke, and thermal coal, or a combination of two or more.

[0013] The shell comprises oxide powder and aluminum powder, which are formed by fully mixing the oxide powder and the aluminum powder according to a proportion and then pressing them with the help of a pressing mold.

[0014] As a further preference of the present invention, the oxide powder is selected from metal oxide powder. More optimally, the metal oxide powder is preferably any one or a combination of Fe2O3, Fe3O4, FeO, MnO2, Cr2O3, SiO2, and V2O5 powders.

[0015] As a further preference of the present invention, the shell of the carbon-based pressed block of the present invention is pressed together with one or more oxide powder combinations and aluminum powder, wherein the weight ratio of oxide powder to aluminum powder is (3 to 3.5): 1. By optimizing the design of the shell components and the ratio between their components, it is possible to effectively ensure that the aluminum powder fully reacts and increase the heat of the molten pool. At the same time, the present invention is set at this specific ratio, and after the aluminum powder reacts completely, the remaining oxide can enter the molten pool to participate in slag formation.

[0016] As a further preference of the present invention, the shell (i.e. the sum of the mass of the oxide powder and the aluminum powder) accounts for 5 to 40% of the total mass of the entire carbon-based pressed block. During actual production, the corresponding proportion can be determined based on specific process and temperature conditions.

[0017] As a further preferred embodiment of the present invention, the particle size of the carbon-based pressed blocks is between 3 and 30 mm.

[0018] As a further preferred embodiment of the present invention, the carbon-based pressed block can be in the shape of a sphere, an ellipsoid, a cube, a cuboid or other block shapes, whichever is more convenient for pressing.

[0019] Secondly, the present invention provides a method for producing the above-mentioned carbon-based pressed blocks, which specifically comprises the following steps:

[0020] Step 1: Mix the oxide powder and aluminum powder in a mass ratio of 3 to 3.5:1.

[0021] Step 2: Pour the carbon-based powder into a pressing mold and press it into shape;

[0022] Step 3: Add the mixture prepared in step 1 to the pressing mold, place the core material prepared in step 2 at the center of the mixed powder, and press it into a semi-finished block;

[0023] Step 4: Add the remaining powder after mixing in step 1 to the upper part of the semi-finished block obtained in step 3 and press it to obtain a carbon-based pressed block.

[0024] As a further improvement of the present invention, in step 2, the particle size of the carbon-based powder is 30-300 mesh, and the pressure during pressing is controlled to be 1200-1500 MPa according to the particle size.

[0025] As a further improvement of the present invention, in step three, the particle size of the mixed powder after the oxide powder and the aluminum powder are mixed is 30-300 mesh, and the pressure during pressing is controlled to be 1200-1500 MPa according to the particle size.

[0026] As a further improvement of the present invention, in step 4, when the remaining mixed powder is pressed, the pressure is controlled to be 200-500 MPa.

[0027] Thirdly, the present invention provides a metal package block, which is filled with a plurality of the above-mentioned carbon-based pressed blocks. By evenly filling the metal package block with a plurality of carbon-based pressed blocks, after the metal package block is added to the molten pool, the temperature inside the metal package block rises, and the oxide powder and aluminum powder in the outer shell undergo a violent oxidation reaction and generate a large amount of heat until the carbon-based powder (such as carbon powder) is exposed and ignited, burning and releasing a large amount of heat in a short time, avoiding the situation in which the surface of the molten pool is burned because the carbon does not have time to burn and float up in the traditional adding method.

[0028] More optimally, in the metal packaged block of the present invention, the total mass of the added carbon-based pressed blocks accounts for 0.1 to 10% of the mass of the entire metal packaged block. The setting of this ratio is based on the specific process requirements and the thickness of the scrap steel material, and different amounts of carbon-based pressed blocks can be added to the metal packaged block.

[0029] Fourthly, the present invention provides a method for producing the above-mentioned metal packaged blocks, which specifically comprises the following steps:

[0030] Step 1: Place the scrap steel into the packing trough;

[0031] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0032] Step 3: Start the hydraulic cylinder of the horizontal pressure block to press the horizontal pressure block to the left end of the inner wall of the packing groove;

[0033] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding movement direction;

[0034] Step 5: Open the upper pressing plate and evenly add a number of carbon-based pressed blocks (1) into the gaps between the half pressed blocks from above;

[0035] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0036] Step 7: Remove the metal packaging block and complete the pressing.

[0037] 3. Beneficial effects

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] A carbon-based pressed block of the present invention, firstly, by designing its structure and adopting a core-shell structure, carbon-based powder is wrapped in an outer shell composed of oxide powder and aluminum powder, thereby avoiding carbon burning after being added to the molten pool and effectively improving the carbon yield; secondly, the components and ratios of the outer shell and core material of the carbon-based pressed block are optimized, which can cause combustion in a short time and generate a large amount of heat.

[0040] A metal packaged block of the present invention is obtained by evenly filling a plurality of carbon-based pressed blocks in a metal packaged block. After the metal packaged block is added to a molten pool, the internal temperature of the metal packaged block rises. At this time, the oxide powder and aluminum powder in the outer shell of the carbon-based pressed block undergo a violent oxidation reaction and generate a large amount of heat. The outer shell breaks, exposing the carbon-based powder inside. The carbon-based powder quickly ignites at high temperature and burns to release a large amount of heat energy again. In the traditional practice, directly adding carbon-based fuel blocks into the molten pool will cause part of the fuel to float directly to the surface of the molten steel and burn, thereby reducing the yield of the carbon-based material, and the contribution to the heat in the furnace is limited, resulting in a large amount of waste.

[0041] Furthermore, the metal baling block design of the present invention has a lower burnout rate than existing baling blocks containing carbon-based fuel. Existing baling blocks containing fuel, when added to the molten pool, burn slowly due to the low initial temperature of the carbon-based fuel. Some of the fuel blocks that are not able to burn in time float to the surface of the pool and burn, resulting in low carbon yields. The outer layer of the carbon-based pressed block in the present invention contains a certain amount of oxide powder and aluminum powder. After being added to the molten pool together with the metal packaged block, the core material made of carbon-based powder is located in the center of the entire carbon-based pressed block and will not be oxidized prematurely. When the temperature of the carbon-based pressed block reaches 1000-1250°C, the oxide and aluminum powder mixture wrapped around the outside of the carbon-based pressed block undergoes a violent combustion reaction, and the temperature can reach 2000-3000°C. The temperature rises rapidly until the burning carbon powder is exposed and ignites the carbon powder, that is, violent combustion can occur in a short time and release a large amount of heat energy, thereby increasing the heat in the furnace and improving the scrap steel ratio. It also effectively avoids the situation where the carbon does not have time to burn and floats to the surface of the molten pool and burns due to the traditional adding method. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the metal packaging block of the present invention;

[0043] Figure 2 Schematic diagram of the structure of the carbon-based pressed block in the present invention; Figure 2 The spherical carbon-based pressed blocks are shown as an example. More specifically, the carbon-based pressed blocks can also be produced using pressing molds of different shapes according to actual needs.

[0044] In the picture:

[0045] 1. Carbon-based pressed block; 11. Shell; 12. Core material; 2. Metal packaging block. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to specific embodiments.

[0047] Example 1

[0048] like Figure 1 and Figure 2 As shown, prepare about 2.5 tons of scrap steel and 112 kg of carbon-based pressed blocks, and make metal baling blocks according to the following steps:

[0049] Step 1: Place the scrap steel into the packing trough;

[0050] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0051] Step 3: Start the hydraulic cylinder of the horizontal pressing block to press the horizontal pressing block to the left end of the inner wall of the packing groove. The press stroke is about half of the normal packing block.

[0052] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding direction of movement. The press stroke is about half of the normal packing block;

[0053] Step 5: Open the upper pressing plate and add the above 112 kg of carbon-based pressed blocks into the gap between the half pressed blocks from above;

[0054] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0055] Step 7: Take out the metal package block and complete the pressing. In the metal package block obtained by pressing, the sum of the masses of all carbon-based pressed blocks accounts for 4.29% of the total mass of the entire metal package block.

[0056] The carbon-based compact has a spherical overall structure with a particle size of 3 to 10 mm. The shell component is formed by pressing oxide powder (Mn3O4 powder) and aluminum powder in a mass ratio of 3:1. The core material is carbon powder pressed into a spherical shape, and the shell mass accounts for 20% of the total mass of the carbon-based compact.

[0057] The carbon-based pressed blocks are prepared using the production method of the present invention, and the key process parameters are controlled as follows:

[0058] When pressing carbon-based powder into core material, the pressing pressure is controlled at 1300 MPa;

[0059] When adding half of the mixed powder used for the shell (i.e., oxide powder and aluminum powder), the pressing pressure is controlled at 290 MPa;

[0060] When adding the remaining mixed powders for the shell (ie, oxide powder and aluminum powder), the pressing pressure is controlled at 1300 MPa.

[0061] The metal packaged block obtained in this embodiment was put into a furnace for use. The combustion of aluminum powder and carbon generated a total of 2660 MJ of heat, causing the average temperature of the packaged block to rise by 57°C. The specific results are shown in Table 1.

[0062] Example 2

[0063] like Figure 1 and Figure 2 As shown, prepare about 4 tons of scrap steel and 80 kg of carbon-based pressed blocks, and make metal baling blocks according to the following steps:

[0064] Step 1: Place the scrap steel into the packing trough;

[0065] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0066] Step 3: Start the hydraulic cylinder of the horizontal pressing block to press the horizontal pressing block to the left end of the inner wall of the packing groove. The press stroke is about half of the normal packing block.

[0067] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding direction of movement. The press stroke is about half of the normal packing block;

[0068] Step 5: Open the upper pressing plate and add the above 80kg of carbon-based pressed blocks into the gap between the half pressed blocks from above;

[0069] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0070] Step 7: Take out the metal package block and complete the pressing. In the metal package block obtained by pressing, the sum of the masses of all carbon-based pressed blocks accounts for 1.96% of the total mass of the entire metal package block.

[0071] The carbon-based compact has a spherical overall structure with a particle size of 25 to 30 mm. The shell component is formed by pressing oxide powder (Fe2O3 powder) and aluminum powder in a mass ratio of 3:1. The core material is carbon powder pressed into a spherical shape, and the shell mass accounts for 20% of the total mass of the carbon-based compact.

[0072] The carbon-based pressed blocks are prepared using the production method of the present invention, and the key process parameters are controlled as follows:

[0073] When pressing carbon-based powder into core material, the pressing pressure is controlled at 1350 MPa;

[0074] When adding half of the mixed powder used for the shell (i.e. oxide powder and aluminum powder), the pressing pressure is controlled at 500 MPa;

[0075] When adding the remaining mixed powders for the shell (ie, oxide powder and aluminum powder), the pressing pressure is controlled at 1200 MPa.

[0076] The metal packaged block obtained in this embodiment was put into a furnace for use. The combustion of aluminum powder and carbon generated a total of 1906 MJ of heat, causing the average temperature of the packaged block to rise by 33°C. The specific results are shown in Table 1.

[0077] Example 3

[0078] like Figure 1 and Figure 2 As shown, prepare about 3 tons of scrap steel and 150 kg of carbon-based pressed blocks, and make metal baling blocks according to the following steps:

[0079] Step 1: Place the scrap steel into the packing trough;

[0080] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0081] Step 3: Start the hydraulic cylinder of the horizontal pressing block to press the horizontal pressing block to the left end of the inner wall of the packing groove. The press stroke is about half of the normal packing block.

[0082] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding direction of movement. The press stroke is about half of the normal packing block;

[0083] Step 5: Open the upper pressing plate and add the above 150 kg of carbon-based pressed blocks into the gap between the half pressed blocks from above;

[0084] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0085] Step 7: Take out the metal package block and complete the pressing. In the metal package block obtained by pressing, the sum of the masses of all carbon-based pressed blocks accounts for 4.76% of the total mass of the entire metal package block.

[0086] The carbon-based compact has a spherical overall structure with a particle size of 5 to 10 mm. The shell is formed by pressing oxide powder (Fe3O4 powder) and aluminum powder at a mass ratio of 3.5:1. The core is made of carbon powder pressed into a spherical shape, with the shell accounting for 20% of the total mass of the carbon-based compact.

[0087] The carbon-based pressed blocks are prepared using the production method of the present invention, and the key process parameters are controlled as follows:

[0088] When pressing carbon-based powder into core material, the pressing pressure is controlled at 1200 MPa;

[0089] When adding half of the mixed powder used for the shell (i.e., oxide powder and aluminum powder), the pressing pressure is controlled at 340 MPa;

[0090] When adding the remaining mixed powders for the shell (ie, oxide powder and aluminum powder), the pressing pressure is controlled at 1000 MPa.

[0091] The metal packaged block obtained in this embodiment was put into a furnace for use. The combustion of aluminum powder and carbon generated a total of 3559 MJ of heat, causing the average temperature of the packaged block to rise by 72.28°C. The specific results are shown in Table 1.

[0092] Example 4

[0093] like Figure 1 and Figure 2 As shown, prepare about 2 tons of scrap steel and 40 kg of carbon-based pressed blocks, and make metal baling blocks according to the following steps:

[0094] Step 1: Place the scrap steel into the packing trough;

[0095] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0096] Step 3: Start the hydraulic cylinder of the horizontal pressing block to press the horizontal pressing block to the left end of the inner wall of the packing groove. The press stroke is about half of the normal packing block.

[0097] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding direction of movement. The press stroke is about half of the normal packing block;

[0098] Step 5: Open the upper pressing plate and add the above 30 carbon-based pressed blocks into the gaps between the half pressed blocks from above.

[0099] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0100] Step 7: Take out the metal package block and complete the pressing. In the metal package block obtained by pressing, the sum of the masses of all carbon-based pressed blocks accounts for 1.96% of the total mass of the entire metal package block.

[0101] The carbon-based compact has a spherical overall structure with a particle size of 15 to 20 mm. The shell component is formed by pressing oxide powder (Fe3O4 powder) and aluminum powder at a mass ratio of 3.5:1. The core material is carbon powder pressed into a spherical shape, and the shell mass accounts for 25% of the total mass of the carbon-based compact.

[0102] The carbon-based pressed blocks are prepared using the production method of the present invention, and the key process parameters are controlled as follows:

[0103] When pressing carbon-based powder into core material, the pressing pressure is controlled at 1500Mpa;

[0104] When adding half of the mixed powder used for the shell (i.e., oxide powder and aluminum powder), the pressing pressure is controlled at 280 MPa;

[0105] When adding the remaining mixed powders for the shell (ie, oxide powder and aluminum powder), the pressing pressure is controlled at 1500 MPa.

[0106] The metal packaged block obtained in this embodiment was put into a furnace for use. The combustion of aluminum powder and carbon generated a total of 898 MJ of heat, causing the average temperature of the packaged block to rise by 36.14°C. The specific results are shown in Table 1.

[0107] Example 5

[0108] like Figure 1 and Figure 2 As shown, prepare about 3 tons of scrap steel and 90 kg of carbon-based pressed blocks, and make metal baling blocks according to the following steps:

[0109] Step 1: Place the scrap steel into the packing trough;

[0110] Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position;

[0111] Step 3: Start the hydraulic cylinder of the horizontal pressing block to press the horizontal pressing block to the left end of the inner wall of the packing groove. The press stroke is about half of the normal packing block.

[0112] Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding direction of movement. The press stroke is about half of the normal packing block;

[0113] Step 5: Open the upper pressing plate and add the above 90 kg of carbon-based pressed blocks into the gap between the half pressed blocks from above;

[0114] Step 6: Repeat steps 1 to 5 to press the half block to the target size;

[0115] Step 7: Take out the metal package block and complete the pressing. In the metal package block obtained by pressing, the sum of the masses of all carbon-based pressed blocks accounts for 2.91% of the total mass of the entire metal package block.

[0116] The carbon-based compact has a spherical overall structure with a particle size of 3 to 5 mm. The shell is formed by pressing oxide powder (a mixed powder of MnO2, Cr2O3, and SiO2) and aluminum powder in a mass ratio of 3:1. The core is made of carbon powder pressed into a spherical shape, with the shell accounting for 25% of the total mass of the carbon-based compact.

[0117] The carbon-based pressed blocks are prepared using the production method of the present invention, and the key process parameters are controlled as follows:

[0118] When pressing carbon-based powder into core material, the pressing pressure is controlled at 1245 MPa;

[0119] When adding half of the mixed powder used for the shell (i.e. oxide powder and aluminum powder), the pressing pressure is controlled at 200 MPa;

[0120] When adding the remaining mixed powders for the shell (ie, oxide powder and aluminum powder), the pressing pressure is controlled at 1350 MPa.

[0121] The metal packaged block obtained in this embodiment was put into a furnace for use. The combustion of aluminum powder and carbon generated a total of 2012 MJ of heat, causing the average temperature of the packaged block to rise by 47.9°C. The specific results are shown in Table 1.

[0122] Comparative Example 1

[0123] The production process of the metal baling blocks in this comparative example is the same as that in Example 1. The difference from Example 1 is that the carbon-based pressed blocks of the present invention are not added, and the scrap steel is directly pressed into metal baling blocks of the same size as in Example 1 through a baler.

[0124] The metal packing blocks obtained in this comparative example were put into a furnace for use. The specific results are shown in Table 1.

[0125] Comparative Example 2

[0126] The production process of the metal packaging block of this comparative example is the same as that of comparative example 1.

[0127] When the metal packaged blocks obtained in this comparative example were used, the metal packaged blocks of this comparative example were put into the furnace together with the same 112 kg carbon-based pressed blocks as in Example 1. The specific results are shown in Table 1.

[0128] Comparative Example 3

[0129] The manufacturing process of the metal packaging block of this comparative example is the same as that of Example 1. The difference between this comparative example and Example 1 is that the carbon-based pressed block is directly pressed by carbon powder.

[0130] The metal packing blocks obtained in this comparative example were put into a furnace for use. The specific results are shown in Table 1.

[0131] Comparative Example 4

[0132] The manufacturing process of the metal packaging block of this comparative example is the same as that of Example 1. The difference from Example 1 is that the carbon-based pressed block is directly pressed into shape after carbon powder and aluminum powder are mixed evenly.

[0133] The metal packing blocks obtained in this comparative example were put into a furnace for use. The specific results are shown in Table 1.

[0134] Comparative Example 5

[0135] The manufacturing process of the metal packaged blocks in this comparative example is the same as that of Example 1. The difference from Example 1 is that the carbon-based pressed blocks are directly pressed into shape after carbon powder and oxide powder are mixed evenly.

[0136] The metal packing blocks obtained in this comparative example were put into a furnace for use. The specific results are shown in Table 1.

[0137] Table 1 In each embodiment and comparative example...

[0138] Serial number Melting time Example 1 220s Example 2 315s Example 3 202s Example 4 280s Example 5 260s Comparative Example 1 300s Comparative Example 2 274s Comparative Example 3 255s Comparative Example 4 280s Comparative Example 5 260s

[0139] The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and variations may be made without departing from the scope of the present invention as defined by the appended claims. The detailed description and accompanying drawings should be considered merely illustrative and not restrictive, and any such modifications and variations, if any, are intended to fall within the scope of the present invention as described herein. In addition, the background art is intended to illustrate the current status and significance of the present technology and is not intended to limit the present invention or the application and fields of application of the present invention.

[0140] More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but rather includes any and all embodiments that may be recognized by those skilled in the art based on the foregoing detailed description, such as combinations between the various embodiments, adaptations, and / or substitutions. The limitations in the claims are to be interpreted broadly based on the language used in the claims and are not limited to the examples described in the foregoing detailed description or during the prosecution of this application, which examples should be considered non-exclusive. Any steps recited in any method or process claim may be performed in any order and are not limited to the order set forth in the claims. Therefore, the scope of the invention should be determined solely by the appended claims and their legal equivalents, rather than by the description and examples given above.

[0141] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. When there is a conflict, the definitions in this specification sheet shall prevail. When rate, pressure, temperature, time, or other values ​​or parameters are expressed as ranges, preferred ranges, or a series of upper preferred ranges and lower preferred ranges, this should be understood to specifically disclose all ranges formed by any pairing of any upper range limit or preferred value with any lower range limit or preferred value, regardless of whether the range is disclosed separately. , 1.5, 1.6, 1.7, 1.8, and 1.9. With respect to subranges, specifically contemplated are "nested subranges" extending from any endpoint within the range. For example, nested sub-ranges of the exemplary range 1-50 may include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in the other direction.

Claims

1. A carbon-based pressed block, characterized in that: The carbon-based pressed block (1) is composed of a core material (12) and a shell (11) wrapped around the surface of the core material (12); the core material (12) is pressed by carbon-based powder, and the shell (11) is pressed by mixing oxide powder and aluminum powder; The weight ratio of the oxide powder to the aluminum powder is (3-3.5):1, and the mass of the shell (11) accounts for 5-40% of the total mass of the entire carbon-based pressed block (1).

2. A carbon-based pressed block according to claim 1, characterized in that: The oxide powder is metal oxide powder.

3. A carbon-based pressed block according to claim 2, characterized in that: The metal oxide powder is any one of Fe2O3, Fe3O4, FeO, MnO2, Cr2O3, SiO2, and V2O5 powders, or a combination of several of them.

4. A carbon-based pressed block according to any one of claims 1 to 3, characterized in that: The particle size of the carbon-based pressed block (1) is 3 to 30 mm.

5. A carbon-based pressed block according to any one of claims 1 to 3, characterized in that: The carbon-based pressed block (1) is processed as a whole into a spherical shape, an ellipsoidal shape, a cubic shape or a rectangular parallelepiped shape.

6. A method for producing a carbon-based pressed block according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Mix aluminum powder and oxide powder thoroughly; Step 2: Pour the carbon-based powder into a pressing mold and press it into shape; Step 3: After adding half of the powder mixed in step 1 into the pressing mold, the core material (12) pre-pressed in step 2 is placed at the center of the mixed powder and pressed to form a semi-finished block; Step 4: Add the remaining powder after mixing in step 1 to the upper part of the semi-finished block obtained in step 3 and press it to obtain a carbon-based pressed block (1).

7. The method for producing a carbon-based pressed block according to claim 6, wherein: In step 2, the pressing pressure is controlled at 1200~1500 MPa; in step 3, the pressing pressure is controlled at 200~500 MPa; in step 4, the pressing pressure is controlled at 1000~1500 MPa.

8. A metal packing block, characterized in that: The metal package (2) is filled with a plurality of carbon-based pressed blocks (1) according to any one of claims 1 to 5, and the total mass of the carbon-based pressed blocks (1) added accounts for 0.1 to 10% of the mass of the entire metal package (2).

9. A method for producing a metal packaged block according to claim 8, characterized in that: The following steps are involved: Step 1: Place the scrap steel into the packing trough; Step 2: Start the pressure plate hydraulic cylinder to press the pressure plate to the horizontal position; Step 3: Start the hydraulic cylinder of the horizontal pressure block to press the horizontal pressure block to the left end of the inner wall of the packing groove; Step 4: Start the hydraulic cylinder of the longitudinal pressing block to make the longitudinal pressing block continue to press the scrap steel in the corresponding movement direction; Step 5: Open the upper pressing plate and evenly add a number of carbon-based pressed blocks (1) into the gap between the pressed blocks from above the half pressed blocks; Step 6: Repeat steps 1 to 5 to press the half block to the target size; Step 7: Take out the metal packing block (2) and complete the pressing.

Images