A high-strength steel slag plate and forming method thereof

Abstract

This application relates to a high-strength steel slag board and a forming method thereof, and relates to the technical field of steel slag modification. The forming method comprises the following steps: adding a silicon extender to steel slag powder and mixing the mixture to obtain a powder mixture, wherein the silicon extender comprises at least one of amorphous SiO2 powder and precipitated bead powder; adding water to the powder mixture and stirring to form a mortar mixture; and processing the mortar mixture to form a steel slag board. This application has the effect of increasing the compressive strength of the steel slag board.

Description

Technical Field

[0001] The present application relates to the technical field of steel slag modification, and in particular to a high-strength steel slag plate and a forming method thereof. Background Art

[0002] Steel slag is a byproduct of the steel industry, accounting for approximately 15% to 20% of total steel production. my country emits over 100 million tons of steel slag annually, with accumulated stockpiles exceeding 1 billion tons. The comprehensive utilization rate is less than 30%, and the vast majority of steel slag remains unutilized. This massive stockpile of steel slag not only occupies land, wastes resources, and pollutes the environment, but also poses serious safety risks. Therefore, the steel industry urgently needs new technologies for environmentally friendly and resource-efficient slag utilization.

[0003] Carbonation treatment of steel slag is an effective method to improve the resource utilization of steel slag. Carbonation treatment mainly includes the steps of grinding the steel slag into powder - adding water and stirring - die-casting into billets - carbonization treatment. Carbonation treatment can reduce the content of free calcium oxide and magnesium oxide, and solve the problem of poor volume stability of steel slag. The steel slag plate formed after treatment can be converted into building materials or high-value-added products, which can improve the utilization rate of steel slag.

[0004] However, the steel slag plate treated by carbonation in traditional technology has the problem of low strength, which makes the formed product fragile and has poor durability during use.

[0005] In view of this, it is of great significance to provide a high-strength steel slag product. Summary of the Invention

[0006] The purpose of the present application is to provide a steel slag plate and a forming method thereof, which can significantly improve the compressive strength of the steel slag plate.

[0007] In the first aspect, the present application provides a method for forming a high-strength steel slag plate using the following technical solutions:

[0008] A method for forming a high-strength steel slag plate comprises the following steps:

[0009] Adding a silicon supplement to the steel slag powder and mixing them to obtain a powder mixture, wherein the silicon supplement comprises at least one of amorphous SiO2 powder and a precipitated bead powder;

[0010] adding water to the powder mixture and stirring to form a mortar mixture;

[0011] The mortar mixture is processed to form a slag board.

[0012] Furthermore, the steel slag powder is obtained by grinding converter steel slag, and the converter steel slag includes CaO, MgO, SiO2, and Fe2O3 in a mass ratio of 45-50:4-6:10-15:24-28, wherein CaO accounts for 45-50% of the mass of the steel slag powder.

[0013] Furthermore, the silicon supplement comprises amorphous SiO2 powder, and the mass content of the amorphous SiO2 powder is 0.2-1.5% of the steel slag powder.

[0014] Furthermore, the mass content of the amorphous SiO2 powder is 0.6-1.0% of the steel slag powder.

[0015] Furthermore, the silicon supplement further comprises sedimentary bead powder, and the mass content of the sedimentary bead powder is 0.4-1.2% of the steel slag powder.

[0016] Furthermore, the mass content of the pellet powder is 0.6-1.0% of the steel slag powder.

[0017] Furthermore, the amorphous SiO2 powder and the precipitated ball powder are mixed in a mass ratio of 1:1 and added to the steel slag powder.

[0018] Furthermore, the processing of the mortar mixture to form a slag board comprises:

[0019] processing the mortar mixture to form a primary steel slag;

[0020] The steel slag embryo is subjected to carbonation treatment to form a steel slag plate, wherein the steel slag embryo is vibrated during the carbonation treatment.

[0021] Furthermore, the vibration frequency of the steel slag embryo is set to 150-350 Hz.

[0022] In a second aspect, the present application provides a high-strength steel slag plate, which is prepared using the above-mentioned high-strength steel slag plate forming method.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In this application, amorphous SiO2 powder and / or sedimentary ball powder are used as fillers. Amorphous SiO2 and sedimentary ball powder can fill the pores of steel slag, reduce the internal porosity, and increase the density of the material, thereby improving the compressive strength of the pressed green body. In addition, the addition of amorphous SiO2 can also form a new mineral phase during the carbonation process, further improving the microstructure, and the addition of sedimentary ball powder can effectively improve the fluidity of the powder material and improve the strength and stability of the material.

[0025] 2. In this application, amorphous SiO2 powder and precipitated bead powder are used as fillers, which can provide additional reaction surface area during the carbonization process, increase the amount of CO2 solidified during the carbonation process, thereby improving the carbon sequestration capacity of steel slag and contributing more value to environmental protection and carbon reduction.

[0026] 3. In the present application, the steel slag blank is vibrated during the carbonation treatment of the steel slag blank. Mechanical vibration can promote the CO2 to diffuse more evenly into the micropores of the steel slag blank, accelerate the carbonation reaction rate, and improve the overall carbonation efficiency. It also helps to rearrange the steel slag particles in the steel slag blank, promote the cleanliness of the carbonation product, and make the material structure more uniform.

[0027] 4. The mechanical vibration and silicon supplement in this application can not only improve the initial strength of the steel slag plate, but also reduce the generation of cracks during the carbonation process, thereby improving the durability and long-term effectiveness of the pressed green sheet, making it have better performance stability in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a bar graph of the compressive strength of the steel slag plate when the silicon supplement is set as amorphous SiO2 powder in the present application.

[0029] Figure 2 This is a line graph of CO2 absorption when the silicon supplement is set as amorphous SiO2 powder in this application.

[0030] Figure 3 This is a bar graph of the compressive strength of the steel slag plate when the silicon supplement is set as the sinking bead powder in this application.

[0031] Figure 4 This is a line graph of CO2 absorption when the silicon supplement is set as a bead powder in this application.

[0032] Figure 5 This is a bar graph of the compressive strength of the steel slag plate when the silicon supplement is set as amorphous SiO2 powder and sedimentation ball powder in this application.

[0033] Figure 6 This is a line graph of CO2 absorption when the silicon supplement in this application is set as amorphous SiO2 powder and sedimentation bead powder.

[0034] Figure 7 This is a bar graph of the compressive strength of the steel slag plate after mechanical vibration in this application.

[0035] Figure 8 It is a line graph of the CO2 absorption amount after the steel slag plate is mechanically vibrated in this application.

[0036] Figure 9 This is the microscopic morphology of Comparative Example 1.

[0037] Figure 10 This is the microscopic morphology of Example 20. DETAILED DESCRIPTION

[0038] The following will be combined with the Figure 1-10 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. In the following description, the same reference numerals are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0039] In the description of this application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of this application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0040] In addition, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] It should be further understood that the term “and / or” used in this specification and the corresponding claims refers to any and all possible combinations of one or more of the listed items.

[0042] Example 1:

[0043] A method for forming a high-strength steel slag plate comprises the following steps:

[0044] S1. Take converter slag, wherein the converter slag includes CaO, MgO, SiO2, and Fe2O3, wherein CaO accounts for 47% of the mass of the slag powder, MgO accounts for 5% of the mass of the slag powder, SiO2 accounts for 13% of the mass of the slag powder, and Fe2O3 accounts for 26% of the mass of the slag powder;

[0045] S2. Grinding converter slag to obtain slag powder, wherein the grinding time is set to 18 minutes. During this time, the particle size of the slag powder is measured, and the particle size of the slag powder is detected to be 55±10 μm;

[0046] S3. Place the steel slag powder in a 60°C electric constant temperature blast drying oven for drying at a temperature of 60±2°C for 24 hours to fully remove moisture from the steel slag powder;

[0047] S4. Adding a silicon supplement to the steel slag powder, wherein the silicon supplement is set to amorphous SiO2 powder, the purity of the amorphous SiO2 powder is 98%, the particle size is 8000 mesh, and the mass content of the amorphous SiO2 powder added to the steel slag powder is 0.2% of the steel slag powder;

[0048] S5. The mixture of the steel slag powder and the SiO2 powder is subjected to ball mill stirring (mixing) at a stirring speed of 150 r / min and a stirring time of 20 min to obtain a powder mixture;

[0049] S6. Add water to the powder mixture and stir to form a mortar mixture, wherein the mass content of water added to the powder mixture is 10% of the powder mixture; during stirring, mechanically stir at a low speed of 150 r / min for 5 minutes;

[0050] S7. Placing the mortar mixture in a mold and pressing it into shape, wherein the pressure during the pressing process is set to 0.7 MPa, and demolding after holding the pressure for 120 seconds to obtain a steel slag embryo. The compaction degree of the steel slag embryo is measured to be 60%;

[0051] S8. Placing the steel slag embryo in a carbonation reaction chamber, and introducing CO2 gas into the carbonation reaction chamber. The CO2 gas concentration is set to 99.99%, the pressure is set to 0.12 MPa, and the carbonation time is set to 7 hours to form a steel slag plate.

[0052] S9. Place the steel slag plate in a constant temperature drying oven for drying. The drying temperature is set to 60±2°C and the drying time is set to 7h.

[0053] Example 2:

[0054] A method for forming a high-strength steel slag plate comprises the following steps:

[0055] S1. Take converter slag, wherein the converter slag includes CaO, MgO, SiO2, and Fe2O3, wherein CaO accounts for 50% of the mass of the slag powder, MgO accounts for 4% of the mass of the slag powder, SiO2 accounts for 15% of the mass of the slag powder, and Fe2O3 accounts for 28% of the mass of the slag powder.

[0056] S2. Grinding converter slag to obtain slag powder, wherein the grinding time is set to 15 minutes. During this time, the particle size of the slag powder is measured, and the particle size of the slag powder is detected to be 65±10 μm;

[0057] S3. Place the steel slag powder in a 60°C electric constant temperature blast drying oven for drying at a temperature of 60±2°C for 24 hours to fully remove moisture from the steel slag powder;

[0058] S4. Adding a silicon supplement to the steel slag powder, wherein the silicon supplement is set to amorphous SiO2 powder, the purity of the amorphous SiO2 powder is 98%, the particle size is 8000 mesh, and the mass content of the amorphous SiO2 powder added to the steel slag powder is 0.2% of the steel slag powder;

[0059] S5. The mixture of the steel slag powder and the SiO2 powder is subjected to ball milling stirring (mixing) at a stirring speed of 200 r / min and a stirring time of 15 min to obtain a powder mixture;

[0060] S6. Add water to the powder mixture and stir to form a mortar mixture, wherein the mass content of water added to the powder mixture is 12% of the powder mixture; during stirring, mechanically stir at a low speed of 200 r / min for 3 minutes;

[0061] S7, placing the mortar mixture in a mold and pressing it into shape, wherein the pressure during the pressing process is set to 0.9 MPa, and demolding after holding the pressure for 90 seconds to obtain a steel slag embryo;

[0062] S8. Placing the steel slag embryo in a carbonation reaction chamber, and introducing CO2 gas into the carbonation reaction chamber. The CO2 gas concentration is set to 99.99%, the pressure is set to 0.15 MPa, and the carbonation time is set to 9 hours to form a steel slag plate.

[0063] S9. Place the steel slag plate in a constant temperature drying oven for drying. The drying temperature is set to 60±2°C and the drying time is set to 6h.

[0064] Example 3:

[0065] A method for forming a high-strength steel slag plate comprises the following steps:

[0066] S1. Take converter slag, wherein the converter slag includes CaO, MgO, SiO2, and Fe2O3, wherein CaO accounts for 48% of the mass of the slag powder, MgO accounts for 6% of the mass of the slag powder, SiO2 accounts for 10% of the mass of the slag powder, and Fe2O3 accounts for 24% of the mass of the slag powder.

[0067] S2. Grinding converter slag to obtain slag powder, wherein the grinding time is set to 20 minutes. During this time, the particle size of the slag powder is measured, and the particle size of the slag powder is detected to be 50±10 μm;

[0068] S3. Place the steel slag powder in a 60°C electric constant temperature blast drying oven for drying at a temperature of 60±2°C for 24 hours to fully remove moisture from the steel slag powder;

[0069] S4. Adding a silicon supplement to the steel slag powder, wherein the silicon supplement is set to amorphous SiO2 powder, the purity of the amorphous SiO2 powder is 98%, the particle size is 8000 mesh, and the mass content of the amorphous SiO2 powder added to the steel slag powder is 0.2% of the steel slag powder;

[0070] S5. The mixture of the steel slag powder and the SiO2 powder is subjected to ball milling stirring (mixing) at a stirring speed of 180 r / min and a stirring time of 30 min to obtain a powder mixture;

[0071] S6. Add water to the powder mixture and stir to form a mortar mixture, wherein the mass content of water added to the powder mixture is 8% of the powder mixture; during stirring, mechanically stir at a low speed of 180 r / min for 4 minutes;

[0072] S7, placing the mortar mixture in a mold and pressing it into shape, wherein the pressure during the pressing process is set to 0.6 MPa, and demolding after holding the pressure for 100 seconds to obtain a steel slag embryo;

[0073] S8. Placing the steel slag embryo in a carbonation reaction chamber, and introducing CO2 gas into the carbonation reaction chamber. The CO2 gas concentration is set to 99.99%, the pressure is set to 0.10 MPa, and the carbonation time is set to 3 hours to form a steel slag plate.

[0074] S9. Place the steel slag plate in a constant temperature drying oven for drying. The drying temperature is set to 60±2°C and the drying time is set to 8h.

[0075] Example 4:

[0076] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 0.4% of the steel slag powder.

[0077] Example 5:

[0078] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 0.6% of the steel slag powder.

[0079] Example 6:

[0080] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 0.8% of the steel slag powder.

[0081] Example 7:

[0082] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 1.0% of the steel slag powder.

[0083] Example 8:

[0084] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 1.2% of the steel slag powder.

[0085] Example 9:

[0086] A forming method of a high-strength steel slag plate is the same as that of Example 1, except that the mass content of amorphous SiO2 powder is 1.5% of the steel slag powder.

[0087] Example 10:

[0088] A forming method for a high-strength steel slag plate is the same as that of Example 1, except that the silicon supplement is set as a sedimentary bead powder, and the mass content of the sedimentary bead powder is 0.4% of the steel slag powder.

[0089] Among them, sinking beads are a type of fly ash.

[0090] Specifically, fly ash is classified by density into sinking beads and floating beads. Floating beads are hollow glass microspheres with a density of less than 1 gram per cubic centimeter, allowing them to float on the water surface. Sinking beads, on the other hand, have a density greater than 1 gram per cubic centimeter and sink in water. Their structure is relatively dense, lacking the hollow nature of floating beads.

[0091] Example 11:

[0092] A forming method for a high-strength steel slag plate is the same as that of Example 10, except that the mass content of the sedimentation ball powder is 0.6% of the steel slag powder.

[0093] Example 12:

[0094] A forming method for a high-strength steel slag plate is the same as that of Example 10, except that the mass content of the bead powder is 0.8% of the steel slag powder.

[0095] Example 13:

[0096] A forming method for a high-strength steel slag plate is the same as that of Example 10, except that the mass content of the sedimentation ball powder is 1.0% of the steel slag powder.

[0097] Example 14:

[0098] A high-strength steel slag plate forming method is the same as Example 10, except that the mass content of the bead powder is 1.2% of the steel slag powder.

[0099] Example 15:

[0100] A forming method for a high-strength steel slag plate is the same as Example 1, except that the silicon supplement is set as amorphous SiO2 powder and sedimentary ball powder, the amorphous SiO2 powder and sedimentary ball powder are mixed in a mass ratio of 1:1 and added to the steel slag powder, and the mass content of the amorphous SiO2 powder and the sedimentary ball is set to 0.4% of the steel slag powder.

[0101] Example 16:

[0102] A forming method for a high-strength steel slag plate is the same as that of Example 15, except that the mass content of amorphous SiO2 powder and sedimentary beads is set to 0.6% of the steel slag powder.

[0103] Example 17:

[0104] A forming method for a high-strength steel slag plate is the same as that of Example 15, except that the mass content of amorphous SiO2 powder and sedimentary beads is set to 0.8% of the steel slag powder.

[0105] Example 18:

[0106] A forming method for a high-strength steel slag plate is the same as Example 15, except that the mass content of amorphous SiO2 powder and sedimentary beads is set to 1.0% of the steel slag powder.

[0107] Example 19:

[0108] A method for forming a high-strength steel slag plate is the same as that of Example 16, except that the steel slag embryo is vibrated during the carbonation treatment to form the steel slag plate. The vibration frequency of the steel slag embryo is set to 300 Hz.

[0109] Example 20:

[0110] A method for forming a high-strength steel slag board is the same as that of Example 17, except that the steel slag embryo is vibrated during the carbonation treatment to form the steel slag board. The vibration frequency of the steel slag embryo is set to 300 Hz.

[0111] Example 21:

[0112] A method for forming a high-strength steel slag plate is the same as that of Example 18, except that the steel slag embryo is vibrated during the carbonation treatment to form the steel slag plate. The vibration frequency of the steel slag embryo is set to 300 Hz.

[0113] Example 22:

[0114] A forming method for a high-strength steel slag plate is the same as that of Example 20, except that the vibration frequency of the steel slag embryo is set to 150 Hz.

[0115] Example 23:

[0116] A forming method for a high-strength steel slag plate is the same as that of Example 20, except that the vibration frequency of the steel slag embryo is set to 350 Hz.

[0117] Comparative Example 1: A method for forming a high-strength steel slag plate, which is the same as Example 1, except that no silicon supplement is added.

[0118] Compressive strength test: The compressive strength of the slag plate was measured using a universal press.

[0119] 1) Steel slag plates were prepared according to Comparative Example 1 and Examples 1-7, and weight gain and compressive strength tests were performed on the steel slag plates. The test data are shown in Table 1. A bar chart and a line chart were drawn based on the test data. Figure 1-2 shown.

[0120] Table 1

[0121]

[0122]

[0123] According to Table 1, compared with Comparative Example 1, after adding amorphous SiO2 powder, Examples 1 and Examples 4-7 have an average weight gain rate when forming the steel slag plate, which is to say, the ability to solidify CO2 gas is improved. This is because the addition of amorphous SiO2 powder can provide additional reaction surface area during the carbonization process, thereby increasing the amount of CO2 solidified during the carbonation process, thereby improving the carbon sequestration capacity of the steel slag. Among them, when the addition amount of amorphous SiO2 powder is 0.8% of the steel slag powder, compared with Comparative Example 1, the average weight gain rate is increased by 7.42%;

[0124] Compared to Comparative Example 1, the addition of amorphous SiO2 powder to the slag plates in Examples 1 and 4-9 significantly improved their compressive strength. With the addition of amorphous SiO2 powder, the weight gain and compressive strength of the slag plates increased first and then decreased.

[0125] Among them, when the amorphous SiO2 powder is set in the range of 0.6-1.0% of the steel slag powder (ie, Examples 5-7), the weight gain rate and compressive strength of the steel slag board are significantly improved.

[0126] First, although the difference in the addition amount between Example 5 and Example 4 is only 0.2%, the degree of compressive strength enhancement in Example 5 is 3 times that of Example 4, showing significant improvement; secondly, the compressive strength performance of the steel slag plate prepared in Example 6 is the best, which is increased by 51.61% compared with Comparative Example 1.

[0127] 2) Steel slag plates were prepared according to the methods of Examples 10-14, and the weight gain rate and compressive strength tests of the steel slag plates were performed, and compared with the data of Comparative Example 1. The test data are shown in Table 2. A bar chart and a line chart were drawn based on the test data. Figure 3-4 shown.

[0128] Table 2

[0129]

[0130] As shown in Table 2, compared with Comparative Example 1, after adding the sedimentary ball powder, the average weight gain rate of the steel slag plate was improved in Examples 10-14. This is because the addition of the sedimentary ball powder can also provide additional reaction area during the carbonization process, thereby improving the carbon sequestration capacity of the steel slag. Compared with Comparative Example 1, the average weight gain rate increased by 4.48%.

[0131] At the same time, the addition of the bead powder can effectively improve the fluidity of the powder material and enhance the strength and stability of the material. Compared with Comparative Example 1, the compressive strength of the steel slag board formed in Examples 10-14 was improved after the addition of the bead powder. With the increase of amorphous SiO2 powder, the weight gain rate and compressive strength of the steel slag board first increased and then decreased.

[0132] Among them, when the bead powder is set in the range of 0.6-1.0% of the steel slag powder (i.e., Examples 11-13), the weight gain rate and compressive strength of the steel slag board are more prominent. First, although the difference in the addition amount of Example 11 compared to Example 10 is only 0.2%, the degree of compressive strength enhancement of Example 11 is nearly 7 times that of Example 10. This difference is greater than the difference between Example 5 and Example 4, showing significant improvement. Second, the compressive strength performance of the steel slag board prepared in Example 12 is the best, increasing by 28.43% compared to Comparative Example 1.

[0133] It is also necessary to find that the weight gain rate and compressive strength of Examples 10-14 are smaller than those of Examples 1 and 4-9. This is because the amorphous SiO2 powder has a smaller particle size than the bead powder. In terms of mass ratio, the amorphous SiO2 powder can provide more additional reaction area.

[0134] However, although the steel slag plate formed by adding sinking ball powder has a disadvantage in compressive strength compared to that formed by adding amorphous SiO2 powder, the steel slag plate formed by adding sinking ball powder has better fluidity, so that the steel slag plate formed by adding sinking ball powder can be used as a 3D printing profile, and has a good application scenario in the field of 3D printing.

[0135] 3) Steel slag plates were prepared according to the methods of Examples 15-18, and the weight gain rate and compressive strength tests of the steel slag plates were performed, and compared with the data of Comparative Example 1. The test data are shown in Table 3. A bar chart and a line chart were drawn based on the test data. Figure 5-6 shown.

[0136] Table 3

[0137]

[0138] Table 3 shows that, compared to Comparative Example 1, the addition of both amorphous SiO2 powder and precipitated bead powder in Examples 15-18 resulted in improved weight gain and compressive strength of the slag board. The weight gain and compressive strength of the slag board followed the same pattern as in Examples 4-9 and 10-14, as the amount of amorphous SiO2 powder and precipitated bead powder increased.

[0139] When the amount of amorphous SiO2 powder and sinking bead powder added is relatively small, the compressive strength of the formed slag board can be significantly enhanced, with Example 15 being the most prominent example. Specifically, Example 15 achieves a 3.18% higher compressive strength enhancement compared to the combined effect of Examples 4 and 10. This means that when the amount of silicon supplement added is relatively small, the simultaneous addition of amorphous SiO2 powder and sinking bead powder can significantly improve the compressive strength of the slag board compared to adding either amorphous SiO2 powder or sinking bead powder alone.

[0140] In addition, compared with Example 1, Example 4-9, and Example 10-14, Examples 15-18, that is, when the amount of silicon supplement added is the same, the addition of amorphous SiO2 powder and sedimentation ball powder at the same time has further improved the weight gain rate and the degree of compressive strength enhancement compared to adding amorphous SiO2 powder or sedimentation ball powder alone.

[0141] This is due to the simultaneous addition of amorphous SiO2 powder and precipitated beads, which not only provides more reaction area but also improves the fluidity of the slag embryo. Example 17 achieved the highest weight gain and compressive strength enhancement, with a weight gain of 7.84% and a compressive strength enhancement of 55.83%.

[0142] 4) Steel slag plates were prepared according to the methods of Examples 19-21, and the obtained steel slag plates were subjected to compressive strength tests. The test data are shown in Table 4. A bar chart and a line chart were drawn based on the obtained test data, as shown in Table 4. Figure 7-8 shown.

[0143] Table 4

[0144]

[0145]

[0146] As can be seen from Table 4, Example 19 is compared with Example 16, Example 20 is compared with Example 17, and Example 21 is compared with Example 18. That is, under the condition of the same silicon supplement content, vibrating the steel slag embryo during the carbonization process further improves the weight gain rate and compressive strength of the formed steel slag board.

[0147] Compared with the case without vibration, the average weight gain rate increased by 0.04%, and the average compressive strength increased by 1.68 MPa. Among them, the compressive strength improvement effect of Example 21 is the best, with the compressive strength increased by 8.6% compared with Example 15 and 69.34% compared with Comparative Example 1, further improving the performance upper limit of the steel slag plate. Figure 9 and Figure 10 It can be seen from the microscopic morphology that the stacking between the particles of the steel slag plate formed in Example 20 is denser and tighter than that in the steel slag plate formed in Comparative Example 1.

[0148] This is because vibrating the preformed slag during the carbonization process promotes more even diffusion of CO2 into the slag's micropores, accelerating the carbonation reaction rate and improving overall carbonation efficiency. It also helps rearrange the slag particles, promoting the cleanliness of the carbonation product, making the material structure more uniform, and reducing the occurrence of cracks during the carbonation process, thereby improving the durability and long-term effectiveness of the slag sheet. In other words, the slag sheet formed after the vibration step exhibits better performance stability in actual applications.

[0149] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A method for forming a high-strength steel slag plate, characterized in that: The following steps are involved: Adding a silicon supplement to the steel slag powder and mixing them to obtain a powder mixture, wherein the silicon supplement comprises at least one of amorphous SiO2 powder and a precipitated bead powder; adding water to the powder mixture and stirring to form a mortar mixture; Processing the mortar mixture to form a slag board comprises: processing the mortar mixture to form a primary steel slag; The steel slag embryo is subjected to carbonation treatment to form a steel slag plate, wherein the steel slag embryo is vibrated during the carbonation treatment.

2. The method for forming a high-strength steel slag plate according to claim 1, characterized in that: The steel slag powder is obtained by grinding converter steel slag, and the converter steel slag includes CaO, MgO, SiO2, and Fe2O3 in a mass ratio of 45-50:4-6:10-15:24-28, wherein CaO accounts for 45-50% of the mass of the steel slag powder.

3. The method for forming a high-strength steel slag plate according to claim 1, characterized in that: The silicon supplement comprises amorphous SiO2 powder, and the mass content of the amorphous SiO2 powder is 0.2-1.5% of the steel slag powder.

4. The method for forming a high-strength steel slag plate according to claim 3, characterized in that: The mass content of the amorphous SiO2 powder is 0.6-1.0% of the steel slag powder.

5. The method for forming a high-strength steel slag plate according to any one of claims 3 or 4, characterized in that: The silicon supplement further comprises sedimentary bead powder, and the mass content of the sedimentary bead powder is 0.4-1.2% of the steel slag powder.

6. The method for forming a high-strength steel slag plate according to claim 5, characterized in that: The mass content of the precipitated beads powder is 0.6-1.0% of the steel slag powder.

7. The method for forming a high-strength steel slag plate according to claim 5, characterized in that: The amorphous SiO2 powder and the precipitated ball powder are mixed in a mass ratio of 1:1 and added into the steel slag powder.

8. The method for forming a high-strength steel slag plate according to claim 1, characterized in that: The vibration frequency of the steel slag embryo is set to 150-350 Hz.

9. A high-strength steel slag plate, characterized in that: The high-strength steel slag plate is prepared by the molding method of any one of claims 1 to 8.

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