Steel slag-based non-metal abrasive material and preparation method thereof

Abstract

The invention relates to the field of industrial solid waste steelmaking slag resource regeneration, and discloses a steel slag-based non-metal abrasive and a preparation method thereof, the abrasive comprises the following components: 89wt%-94wt% of molten steel slag, 1.28 wt%-4.68 wt% of iron tailings, and 3.38 wt%-7.71 wt% of lime; the preparation method comprises the following steps: (1) pouring molten steel slag, iron tailings and lime into a tundish, mixing, and uniformly stirring; (2) heating the mixture to 1500-1600 DEG C in the tundish, and then crushing and granulating the molten mixture by using a gas quenching and granulating device to obtain gas-quenched steel slag; and (3) drying the gas-quenched steel slag, and screening to obtain the non-metal grinding material. According to the invention, the industrial solid waste and the auxiliary materials are reasonably and scientifically matched, so that the industrial waste residue is quenched and crushed to produce an amorphous nonmetal product with higher chemical stability, and the amorphous nonmetal product is screened to obtain a nonmetal abrasive product which meets the standard requirements of sand blasting abrasives and has stable performance indexes.

Description

Technical Field

[0001] This invention relates to the field of non-metallic materials technology, specifically to a steel slag-based non-metallic abrasive and its preparation method. Background Technology

[0002] Steel slag is a solid byproduct generated during the smelting of crude steel, accounting for approximately 10% to 15% of crude steel production.

[0003] Iron tailings are byproducts discharged after iron ore has been processed through grinding, flotation, or magnetic separation under specific conditions to remove the "useful portion." They consist of fine particles and contain a large amount of unused iron (Fe). The disposal of unused iron tailings through stockpiling and landfilling not only occupies significant land resources but also causes serious environmental pollution. Therefore, the proper disposal of iron tailings is urgent. How to address the disposal of these two major industrial solid wastes and transform them into resource-based assets has become a focus of common concern in the metallurgical and mining industries.

[0004] Steel slag contains abundant SiO2, CaO, Al2O3, MgO, and Fe2O3, while iron tailings contain abundant SiO2 and Fe2O3, both important components of glass. Research shows that most recycling methods for steel slag and iron tailings involve reducing and separating the iron-containing components for use as metallurgical raw materials. Furthermore, when steel slag is used as a building or road construction material, the presence of FeO and Fe2O3 poses safety risks, and Fe-containing materials are generally not added for compositional adjustments. However, research on preparing abrasives for blast cleaning using steel slag has revealed that iron oxides enhance the hardness and overall strength of the abrasive. Previous studies have not shown any adjustment of the steel slag composition to improve abrasive performance, and the granulation methods used are mostly water quenching or tumbling, resulting in inconsistent abrasive particle size and quality. This not only wastes water resources and generates polluting gases but also results in low waste heat recovery rates during the production process.

[0005] Therefore, the co-processing of metallurgical solid waste and mineral solid waste to prepare non-metallic abrasives can promote the resource transformation of bulk industrial solid waste. However, how to rationally combine the effective components in different solid wastes, make reasonable use of the sensible heat of slag and the waste heat of products, and efficiently and cost-effectively prepare high-performance non-metallic abrasives with stable quality is an urgent problem to be solved in the metallurgical and mining industries at this stage, and it is also a challenge. Summary of the Invention

[0006] In view of the shortcomings of the prior art mentioned above, the purpose of this invention is to provide a steel slag-based non-metallic abrasive and its preparation method, which aims to improve the performance of steel slag-based sandblasting abrasive, expand new ways of utilizing steel slag, and increase the utilization rate of steel slag and tailings.

[0007] To achieve the above objectives, the present invention provides a steel slag-based non-metallic abrasive, wherein, by weight percentage, the abrasive is composed of the following components: 89wt%~94wt% molten steel slag, 1.28wt%~4.68wt% iron tailings, and 3.38wt%~7.71wt% lime. The abrasive has a hardness of 7~8 Mohs, an f-CaO content of ≤2.4%, and an apparent density of 3300~3600 kg / m³.

[0008] Furthermore, the molten steel slag is selected from converter or electric furnace steelmaking slag, with a temperature of 1500~1600℃, a TFe content of 10wt%~25wt%, and a basicity of 1.9~2.1.

[0009] Furthermore, the lime is quicklime with a CaO content ranging from 95wt% to 99wt% and a particle size ranging from 5mm to 40mm.

[0010] Furthermore, the iron tailings have a TFe content of 8wt%~20wt%, a SiO2 content of ≤76wt%, a particle size range of ≤3mm, and a moisture content of <1wt%.

[0011] On the other hand, a method for preparing a steel slag-based non-metallic abrasive is provided, wherein the abrasive comprises the components as described in any one of claims 1-4, and includes the following steps: 1) Molten steel slag, iron tailings, and lime are poured into a tundish for homogenization, reheating, and stirring: First, during the addition of molten steel slag to the tundish, electromagnetic reheating and pneumatic stirring are continuously carried out, with the pneumatic stirring pipeline pressure at 0.2MPa~0.3MPa. After iron tailings and lime are added to the tundish, temperature is measured and reheating and pneumatic stirring are performed, with the pneumatic stirring pipeline pressure reduced to 0.1MPa~0.2MPa. Among them, the iron tailings are preheated before use to reduce their moisture content to below 1wt%. 2) Control the temperature of the tempered molten steel slag obtained in step 1) at 1500~1600℃, and let the tempered molten steel slag flow out through the sliding gate device; 3) The outflowing quenched and tempered molten steel slag is crushed and granulated using an air quenching granulation device to obtain slag particles. The slag particles enter a collection pool, where atomized water is used for enhanced cooling above the collection pool; the slag particles are cooled to below 200°C. 4) The slag particles obtained in step 3) are mechanically vibrated and screened. The material that passes through the screen is steel slag-based non-metallic abrasive.

[0012] On the other hand, an intermediate package for the above preparation method is provided, comprising: an outer stainless steel shell; The intermediate permanent layer has a thickness of 100mm~150mm; The inner layer of magnesium refractory material has a thickness of 150mm~200mm; A channel-type electromagnetic induction heating device is installed on the side of the casing; A pneumatic mixing device includes a permeable brick and a fixed base brick, wherein the permeable brick and the fixed base brick are connected by a mortise and tenon structure; The sliding nozzle device is installed outside the slag outlet.

[0013] Furthermore, the permanent layer is a castable material, which is baked at 800℃~1200℃ for 8~10 hours before use.

[0014] Furthermore, the center line of the pneumatic stirring hole is 500mm~700mm away from the outer wall of the left cladding of the iron core, and the center line of the slag discharge port is 1500mm~1800mm away from the outer wall of the right cladding of the iron core.

[0015] Beneficial effects of this invention: (1) The steel slag-based non-metallic abrasive provided in this embodiment of the invention adjusts the addition ratio of steel slag, iron tailings, and lime to regulate the compounds that make up the glassy substances in the steel slag and iron tailings, as well as the iron-containing minerals in the iron tailings, to achieve a balance between the Fe content and basicity of the slag. Then, the steel slag-based non-metallic abrasive is produced by gas quenching, realizing the high-value-added development and utilization of two bulk solid wastes. By adjusting the composition of the slag, the fluidity of the mixed slag is improved, and the viscosity and surface tension meet the conditions of the gas quenching process. During the gas quenching and granulation process of the slag, the granulated steel slag is mainly composed of iron-containing amorphous phase, and iron-containing minerals will aggregate near the surface. A small amount of iron-containing spinel-like high-hardness minerals are dispersed inside. This structure can significantly improve the overall hardness and strength of the granulated steel slag.

[0016] (2) Fully utilize the sensible heat of the molten slag for composition adjustment, combined with a small amount of tundish reheating and homogenization technology, and use high-pressure air to crush the molten slag to produce non-metallic abrasives, turning waste into resources. Compared with water quenching and drum quenching, the gas quenching method can save 80-90% of water resources, and the granulated steel slag after gas quenching has advantages such as small particle size, low free calcium oxide content, good thermodynamic stability, and spherical or near-spherical appearance. After screening, it can be used directly, avoiding the energy and labor consumption of secondary processing, solving the problem of by-product utilization at the source of the metallurgical industry, and reducing solid waste output. The gas quenching granulation process can not only efficiently utilize the waste heat of the molten slag, making the waste heat recovery rate reach 50%-60%, but also reduce environmental pollution. Attached Figure Description

[0017] Figure 1 This is a flowchart of the method provided in the embodiments of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the intermediate package provided in an embodiment of the present invention; The following labels are used in the attached drawings: 101-Stainless steel cladding, 102-Permanent layer, 103-Magnesium refractory material layer, 104-Impact cup, 105-Fixed seat brick, 106-Permeable brick, 107-Gas pipe, 108-Pneumatic stirring hole, 109-Iron core, 110-Insulation cover, 111-Coil, 112-Slag outlet brick, 113-Slag outlet hole, 114-Sliding nozzle mechanism, 115-Bottom yoke. Detailed Implementation

[0018] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] Examples 1-9 like Figure 1 As shown, the following raw materials and auxiliary materials are used by weight percentage: 89wt%~94wt% molten steel slag, 1.28wt%~4.68wt% iron tailings, and 3.38wt%~7.71wt% lime. The chemical composition of the molten steel slag by weight percentage includes: CaO: 23%-35%, SiO2: 11%-19%, Al2O3: 1%-5%, Fe2O3: 10%-23%, MgO: 2%-10%, Na2O: 0.2%-3%, and K2O: 0.5%-1%. The chemical composition of the iron tailings by weight percentage includes: CaO: 1%-3%, SiO2: 60%-76%, Al2O3: 1%-3%, Fe2O3: 8%-20%, MgO: 0.3%-2%, Na2O: 0.3%-2.5%, and K2O: 0.14%-1.5%. The lime is in block form and its chemical composition, by mass percentage, includes: CaO: 95%-99%, SiO2: 1%-3%, Al2O3: 1%-3%, MgO: 0.3%-1%.

[0020] During the process of adding molten steel slag to the tundish, electromagnetic heating and pneumatic stirring are continuously carried out. The pressure in the pneumatic stirring pipeline is 0.2~0.3MPa. After all the raw materials have been added to the tundish, temperature measurement and further heating and pneumatic stirring are performed, and the pressure in the pneumatic stirring pipeline is reduced to 0.1~0.2MPa. Then, the slag outlet is opened for gas quenching and granulation. The blowing gas can be compressed air, CO2, or other inert gases, and the blowing pressure is 0.3~0.5MPa. The granulated gas-quenched steel slag is discharged into a collection pool and transported out after the temperature drops to 200℃ for testing. The iron tailings particle size specifications are: less than 0.5mm = 10wt%, and 1-3mm = 90wt%. The lime particle size specifications are: 5-10mm = 10wt%, 10-30mm = 80wt%, and 30-40mm = 10wt%. In addition, the temperature of the molten steel slag is 1500~1600℃, and it is in a fluid state. Performance conditions of quenched and tempered molten steel slag: TFe content 10~25wt%, basicity 1.9~2.1. Moisture content of iron tailings before being added to the tundish <1wt%. Specific raw material and auxiliary material ratios are shown in Table 1.

[0021] Comparative Example 1 like Figure 1 As shown, the dry material components, by weight percentage, are: 88 wt% molten steel slag, 10 wt% iron tailings, and 2 wt% lime. During the addition of the molten steel slag to the tundish, electromagnetic heating and pneumatic stirring are continuously performed, with the pneumatic stirring pipeline pressure at 0.2~0.3 MPa. After all raw materials are added to the tundish, temperature is measured, and heating and pneumatic stirring are performed again, with the pneumatic stirring pipeline pressure reduced to 0.1~0.2 MPa. Then, the slag outlet is opened for gas quenching and granulation. The blowing gas can be compressed air, CO2, or other inert gases, with a blowing pressure of 0.3~0.5 MPa. The granulated gas-quenched steel slag is discharged into a collection pool and transported out after the temperature drops to 200℃ for testing. The iron tailings particle size specifications are: less than 0.5 mm = 10 wt%, and 1-3 mm = 90 wt%. The lime particle size specifications are as follows: 5-10mm = 10wt%, 10-30mm = 80wt%, and 30-40mm = 10wt%. Additionally, the molten steel slag temperature is 1500~1600℃, and it is in a fluid state. The moisture content of the iron tailings before being added to the tundish is <1wt%. Specific raw material and auxiliary material proportions are shown in Table 1.

[0022] Comparative Example 2 like Figure 1As shown, the dry material components, by weight percentage, are: 88 wt% molten steel slag, 1 wt% iron tailings, and 11 wt% lime. During the addition of the molten steel slag to the tundish, electromagnetic heating and pneumatic stirring are continuously performed, with the pneumatic stirring pipeline pressure at 0.2~0.3 MPa. After all raw materials are added to the tundish, temperature is measured, and heating and pneumatic stirring are performed again, with the pneumatic stirring pipeline pressure reduced to 0.1~0.2 MPa. Then, the slag outlet is opened for gas quenching and granulation. The blowing gas can be compressed air, CO2, or other inert gases, with a blowing pressure of 0.3~0.5 MPa. The granulated gas-quenched steel slag is discharged into a collection pool and transported out after the temperature drops to 200℃ for testing. The iron tailings particle size specifications are: less than 0.5 mm = 10 wt%, and 1-3 mm = 90 wt%. The lime particle size specifications are as follows: 5-10mm = 10wt%, 10-30mm = 80wt%, and 30-40mm = 10wt%. Additionally, the molten steel slag temperature is 1500~1600℃, and it is in a fluid state. The moisture content of the iron tailings before being added to the tundish is <1wt%. Specific raw material and auxiliary material proportions are shown in Table 1.

[0023] Comparative Example 3 like Figure 1 As shown, the dry material components, by weight percentage, are: 95wt% molten steel slag, 0.5wt% iron tailings, and 3.5wt% lime. During the addition of the molten steel slag to the tundish, electromagnetic heating and pneumatic stirring are continuously performed, with the pneumatic stirring pipeline pressure at 0.2~0.3MPa. After all raw materials are added to the tundish, temperature is measured, and heating and pneumatic stirring are performed again, with the pneumatic stirring pipeline pressure reduced to 0.1~0.2MPa. Then, the slag outlet is opened for gas quenching and granulation, with compressed air being injected at a pressure of 0.3~0.5MPa. The granulated gas-quenched steel slag is discharged into a collection pool and transported out after the temperature drops to 200℃ for testing. The iron tailings particle size specifications are: less than 0.5mm = 10wt%, and 1-3mm = 90wt%. The lime particle size specifications are as follows: 5-10mm = 10wt%, 10-30mm = 80wt%, and 30-40mm = 10wt%. Additionally, the molten steel slag temperature is 1500~1600℃, and it is in a fluid state. The moisture content of the iron tailings before being added to the tundish is <1wt%. Specific raw material and auxiliary material proportions are shown in Table 1.

[0024] Comparative Example 4 like Figure 1As shown, the dry material components, by weight percentage, are: 95wt% molten steel slag, 3.5wt% iron tailings, and 1.5wt% lime. During the addition of the molten steel slag to the tundish, electromagnetic heating and pneumatic stirring are continuously performed, with the pneumatic stirring pipeline pressure at 0.2~0.3MPa. After all raw materials are added to the tundish, temperature is measured, and heating and pneumatic stirring are performed again, with the pneumatic stirring pipeline pressure reduced to 0.1~0.2MPa. Then, the slag outlet is opened for gas quenching and granulation, with compressed air being injected at a pressure of 0.3~0.5MPa. The granulated gas-quenched steel slag is discharged into a collection pool and transported out after the temperature drops to 200℃ for testing. The iron tailings particle size specifications are: less than 0.5mm = 10wt%, and 1-3mm = 90wt%. The lime particle size specifications are as follows: 5-10mm = 10wt%, 10-30mm = 80wt%, and 30-40mm = 10wt%. Additionally, the molten steel slag temperature is 1500~1600℃, and it is in a fluid state. The moisture content of the iron tailings before being added to the tundish is <1wt%. Specific raw material and auxiliary material proportions are shown in Table 1.

[0025] Table 1. Example Material Formulations (Materials by Weight Percentage) category Steel slag / wt% Iron tailings / wt% lime / wt% Example 1 89 4.68 6.32 Example 2 89 3.98 7.02 Example 3 89 3.29 7.71 Example 4 91 3.86 5.14 Example 5 91 3.18 5.82 Example 6 91 2.49 6.51 Example 7 94 2.62 3.38 Example 8 94 1.95 4.05 Example 9 94 1.28 4.72 Comparative Example 1 88 10 2 Comparative Example 2 88 1 11 Comparative Example 3 95 0.5 4.5 Comparative Example 4 95 3.5 1.5 Example 10:

[0026] According to the requirements of the national standard GB / T17850.11-2011 "Technical Requirements for Non-metallic Abrasives for Jetting Cleaning of Steel Surface Before Coating - Part 11: Special Molding Sand for Steel Slag", the non-metallic abrasives obtained in Examples 1-9 and Comparative Examples 1-4 were taken with the same specifications and dimensions, and their performance was tested. The hardness, moisture content and other performance parameters were tested. According to the corresponding technical indicators, the f-CaO of gas-quenched steel slag was tested. The test results are compared with the actual data and are shown in Table 2.

[0027] Table 2. Test results of material performance indicators project <![CDATA[Apparent density (kg / m 3 ).]]> Hardness (Mohs scale) Moisture content (%) f-CaO (%) Particulate adsorbate content (wt%) Technical indicators 3300~3900 ≥6 ≤0.2 ≤3 ＜0.5 Example 1 3351 7~8 0.19 2.25 0.23 Example 2 3393 7~8 0.18 2.12 0.25 Example 3 3422 7~8 0.18 2.39 0.33 Example 4 3497 7~8 0.17 1.99 0.34 Example 5 3512 7~8 0.15 1.89 0.27 Example 6 3536 7~8 0.16 1.93 0.29 Example 7 3546 7~8 0.14 1.73 0.41 Example 8 3539 7~8 0.12 1.78 0.22 Example 9 3588 7~8 0.17 1.82 0.36 Comparative Example 1 3210 4~5 0.14 1.98 0.48 Comparative Example 2 3282 4~5 0.25 2.52 0.55 Comparative Example 3 3365 5~6 0.14 1.89 0.49 Comparative Example 4 3243 4~5 0.17 1.75 0.51 As shown in Table 2, the non-metallic abrasive prepared in this invention meets the requirements of national standards. Specifically, its technical indicators, such as hardness and moisture content, are higher than the standard parameters, and its f-CaO content is superior to industry requirements. Therefore, the steel slag-based non-metallic abrasive in this invention exhibits excellent performance and has significant practical application value.

[0028] Example 11:

[0029] A method for preparing a steel slag-based non-metallic abrasive, wherein the abrasive comprises the components described in the above embodiments, includes the following steps: 1) Molten steel slag, iron tailings, and lime are poured into an intermediate ladle for homogenization, reheating, and stirring to obtain the treated slag. The iron tailings need to be preheated before use to reduce their moisture content to below 1 wt%. The reheating method is electromagnetic heating, and the stirring method is pneumatic stirring. 2) Control the temperature of the mixed slag obtained in step 1) at 1500~1600℃, and let the slag flow out through the sliding gate device; 3) The molten steel slag flowing out is crushed and granulated using an air-quenching granulation device. The slag particles enter a collection tank and are cooled to below 200°C. The slag that is not completely crushed is crushed and sent to the collection tank. During the air quenching and rapid cooling process, the air-quenching granulation device uses atomized water above the collection tank for enhanced cooling, with wastewater and / or sewage as the cooling medium. 4) The slag particles obtained in step 3) are mechanically vibrated and screened through a 6-mesh mechanical sieve with a sieve hole diameter of 3 mm. The material that passes through the sieve is steel slag-based non-metallic abrasive.

[0030] Example 12:

[0031] An intermediate ladle includes: an outer stainless steel cladding 101, a middle permanent layer 102, an inner magnesia refractory material layer 103 with a thickness of 150-200 mm, a channel-type electromagnetic induction heating device, a pneumatic stirring device, and a sliding gate device; the side steel frame of the channel-type electromagnetic induction heating device is welded to the left side of the stainless steel cladding 101, and the other electromagnetic induction heating devices are threaded to the side steel frame; the pneumatic stirring device includes a permeable brick 106 and a fixed base brick 105, and during installation, the permeable brick 106 is first placed... 06. Insert the pneumatic stirring hole 108, and then place the fixed seat brick 105 and the ventilated brick 106 together. The connection between the ventilated brick 106 and the fixed seat brick 105 is a tenon and mortise structure. After the fixed seat brick 105 and the ventilated brick 106 are connected, adjust the edge of the fixed seat brick 105 to be parallel to the stainless steel shell 101. Place refractory material around the fixed seat brick 105 for fixation. The bottom base of the sliding nozzle device is fixed to the outside of the slag outlet hole 113 of the tundish by welding. The sliding nozzle device is connected to the bottom base by thread.

[0032] The permanent layer 102 is a castable refractory. It must be prepared before use in the tundish. The permanent layer is then used as a tundish lining for pouring the castable refractory. The thickness of the permanent layer is 100-150mm. After pouring, the permanent layer is baked for 8-10 hours at a temperature of 800-1200℃, followed by natural cooling for 24 hours before use. After the permanent layer 102 is prepared, the permeable brick 106 and the fixed base brick 105 are placed into the pneumatic mixing hole 108, and the slag outlet brick 112 is placed into the slag outlet hole 113. Obstructions are placed on the upper sides of the permeable brick 106 and the slag outlet brick 112. Then, the bottom of the tundish is filled with magnesia refractory material, followed by the tundish magnesia refractory material layer 103 lining, and finally, the magnesia refractory material on the sides is added. The bottom and side walls are filled with a 150-200mm thick layer of magnesia refractory material 103. The magnesia refractory material layer 103 needs to be baked for 2-3 hours at a temperature of 800-1200℃ to give it a certain strength and hardness. Then, it is placed in an impact cup 104. The obstructions on the upper side of the permeable brick 106 and the upper side of the slag outlet brick 112 are removed to prepare for the addition of raw materials and auxiliary materials, process heating and stirring. The pneumatic stirring hole 108 and the slag outlet hole 113 are located on the transverse centerline of the tundish. The centerline of the pneumatic stirring hole 108 is 500-700mm away from the outer wall of the left side of the tundish shell of the iron core, and the centerline of the slag outlet hole 113 is 1500-1800mm away from the outer wall of the right side of the tundish shell of the iron core.

[0033] In summary, the present invention provides a steel slag-based non-metallic abrasive and its preparation method, which improves the mechanical properties of special molding sand made from steel slag and opens up new avenues for the utilization of steel slag. This material possesses good hardness, low moisture content, and good chemical stability, with all performance indicators meeting the requirements of relevant standards. Furthermore, by using steel slag and iron tailings, which are industrial solid wastes, as the main raw materials for the abrasive, it transforms waste into valuable resources, achieving synergistic treatment of solid waste while protecting the environment. Therefore, the present invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial utilization value.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A steel slag-based non-metallic abrasive, characterized in that, The abrasive is composed of the following components by weight percentage: 89wt%~94wt% molten steel slag, 1.28wt%~4.68wt% iron tailings, and 3.38wt%~7.71wt% lime. The abrasive has a hardness of 7~8 Mohs, an f-CaO content of ≤2.4%, and an apparent density of 3300~3600 kg / m³.

2. The steel slag-based non-metallic abrasive according to claim 1, characterized in that, The molten steel slag is selected from converter or electric furnace steelmaking slag, with a temperature of 1500~1600℃, a TFe content of 10wt%~25wt%, and a basicity of 1.9~2.

1.

3. The steel slag-based non-metallic abrasive according to claim 1, characterized in that, The lime is quicklime, with a CaO content ranging from 95wt% to 99wt% and a particle size ranging from 5mm to 40mm.

4. The steel slag-based non-metallic abrasive according to claim 1, characterized in that, The iron tailings have a TFe content of 8wt%~20wt%, a SiO2 content of ≤76wt%, a particle size range of ≤3mm, and a moisture content of <1wt%.

5. A method for preparing a steel slag-based non-metallic abrasive, wherein the abrasive comprises the components as described in any one of claims 1-4, characterized in that, Includes the following steps: 1) Molten steel slag, iron tailings, and lime are poured into a tundish for homogenization, reheating, and stirring: First, during the addition of molten steel slag to the tundish, electromagnetic reheating and pneumatic stirring are continuously carried out, with the pneumatic stirring pipeline pressure at 0.2MPa~0.3MPa. After iron tailings and lime are added to the tundish, temperature is measured and reheating and pneumatic stirring are performed, with the pneumatic stirring pipeline pressure reduced to 0.1MPa~0.2MPa. Among them, the iron tailings are preheated before use to reduce their moisture content to below 1wt%. 2) Control the temperature of the tempered molten steel slag obtained in step 1) at 1500~1600℃, and let the tempered molten steel slag flow out through the sliding gate device; 3) The outflowing quenched and tempered molten steel slag is crushed and granulated using an air quenching granulation device to obtain slag particles. The slag particles enter a collection pool, where atomized water is used for enhanced cooling above the collection pool; the slag particles are cooled to below 200°C. 4) The slag particles obtained in step 3) are mechanically vibrated and screened. The material that passes through the screen is steel slag-based non-metallic abrasive.

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