Molten vanadium-containing steel slag hardening and tempering modifier

Abstract

The invention discloses a molten vanadium-containing steel slag hardening and tempering modifier, and belongs to the new technical field of comprehensive utilization of metallurgical slag resources. The hardening and tempering modifier provided by the invention comprises the following components: a component A: Si powder; the component B mainly comprises CaF2; and the component C mainly comprises quick lime, Na2O and K2O. The tempering modifier disclosed by the invention is mainly used for directly using the molten vanadium-containing steel slag when the slag is discharged from the converter, so that the waste heat of the molten steel slag is fully utilized, and the final product of the vanadium-containing steel slag meets the application standard of cement clinker by adding the tempering modifier.

Description

Technical Field

[0001] The invention relates to the new technical field of comprehensive utilization of metallurgical slag resources, and more specifically to a molten vanadium-containing steel slag tempering modifier. Background Art

[0002] After testing, the mineral phase composition of vanadium-containing steel slag is mainly tricalcium silicate, dicalcium silicate, tricalcium aluminate, ferrous vanadate and tetracalcium ferroaluminate, as well as a small amount of RO phase, free CaO, free MgO and unseparated iron, which is similar to the composition of silicate cement clinker. The research on slag as an admixture for preparing cement clinker in my country began in the 1950s and 1960s. In the early 1970s, the Institute of Building Materials first began to conduct relevant research on steel slag as a cement admixture. After that, a series of studies on industrial waste residues such as solid sulfur slag, fly ash, and blast furnace slag as new mineral admixtures for preparing cement clinker appeared. The application of mineral admixtures in the preparation of cement clinker not only utilizes industrial waste residues in cement production, reduces environmental pollution and land occupation caused by waste residue phase, but also reduces the manufacturing cost and resource consumption of concrete. Despite this, the application research of vanadium-containing steel slag in the field of cement still has certain difficulties, and there are still quite a few problems. Therefore, the key reason why vanadium-containing steel slag has not been used as a resource on a large scale is that it has low activity, poor workability, and large composition fluctuations. On the other hand, it is also due to its limited use in cement concrete, high production costs, and economic bias. In order to further realize the large-scale application of vanadium-containing steel slag, it is necessary to activate its activity to improve its existing problems.

[0003] In the prior art, in order to solve the problem of low activity and poor workability of vanadium-containing steel slag, the current technical route is to improve the activity of vanadium-containing steel slag by using active activators, such as the following:

[0004] Chinese invention patent application number 202111246361.0, application publication date: January 7, 2022, invention name: a composite steel slag activation activator and its preparation method and steel slag cement. Chinese invention patent application number 202111284809.8, application publication date: December 31, 2021, invention name: a steel slag activation activator and activated steel slag.

[0005] The above two invention patents both prepare steel slag activity activator by mainly mixing desulfurized gypsum, alkali slag and other substances, and then mix it with steel slag powder and cement to prepare steel slag cement.

[0006] For example, the Chinese invention patent application number is 202211128811.0, the application publication date is December 6, 2022, and the name of the invention is: a steel slag early activity activator and its preparation method and application. This invention patent mainly prepares the steel slag early activity activator by mixing 10-25% quicklime, 5-15% diethanol monoisopropanolamine, and 30-45% kaolin. It can effectively improve the early activity of steel slag under small dosage conditions, and also has a certain improvement effect on the later mechanical properties and working performance; and by improving the activity of steel slag, the amount of steel slag in cementitious materials can be further increased, which has a positive effect on reducing the amount of cement and improving the comprehensive utilization rate of steel slag.

[0007] The above patents all show that the use of the activator can indeed improve the activity of steel slag, and the raw materials of the components of the activator are inexpensive, and the waste steel slag and waste residue are recycled, achieving multiple optimizations of economic, social and environmental benefits. However, from the perspective of maximizing the utilization of steel slag resources, due to the difference between the components of steel slag and cement, if we only think about the problem from the perspective of changing the activity, it is destined that steel slag cannot be used in the field of cement. The starting point of the above patent is only to add a certain amount of steel slag to cement. How to increase the activity of this part of steel slag by using an active activator, so that the performance of cement is further improved or not affected, and the full quantitative utilization of steel slag is achieved. Moreover, when using an active activator, the degree of improvement in the activity of steel slag is limited.

[0008] In addition, through searching, it is found that the above-mentioned known technology is limited to the use of ordinary steel slag, and the resource utilization of vanadium-containing steel slag rich in metallic vanadium (or vanadium pentoxide) is almost not involved. However, with the widespread application of new energy batteries, vanadium pentoxide is used in large quantities as a raw material for vanadium liquid flow batteries, which leads to the large-scale production of vanadium-containing steel slag. How to make good use of steel slag with low vanadium content is currently a more difficult technical problem. Therefore, there is an urgent need for a vanadium-containing steel slag tempering modifier to convert the vanadium pentoxide in the steel slag into harmless alkali metal salts, so that the final product formed by the vanadium-containing steel slag meets the application standards of cement clinker. Summary of the invention

[0009] 1. Technical problem to be solved by the invention

[0010] The purpose of the present invention is to provide a tempering modifier for molten vanadium-containing steel slag to solve the problem of low utilization rate of existing vanadium-containing steel slag. By optimizing the formula of the tempering modifier, the molten vanadium-containing steel slag can be directly converted into cement clinker that meets the standards, thereby expanding the application scope of vanadium-containing steel slag in the field of preparing cement clinker.

[0011] 2. Technical solution

[0012] In order to achieve the above object, the technical solution provided by the present invention is:

[0013] As a first aspect of the present application, the present application provides a molten vanadium-containing steel slag tempering modifier, comprising: component A: Si powder, to adjust the total iron content in the vanadium-containing steel slag;

[0014] Component B: mainly includes CaF2, which is used to adjust the flow characteristics and activity of the molten vanadium-containing steel slag;

[0015] Component C: mainly includes quicklime, Na2O and K2O to adjust the vanadium pentoxide composition and basicity in vanadium-containing steel slag.

[0016] It should be noted that component A and component B are used for modifying vanadium-containing steel slag, and component C is used for modifying vanadium-containing steel slag.

[0017] Furthermore, the particle diameters of the B component and the C component are less than 3 mm.

[0018] Furthermore, the B component also includes NaCl.

[0019] Furthermore, component B also includes SiO2 and CaCO3. Among them, SiO2 can adjust the pH value of vanadium-containing steel slag and reduce the amount of quicklime. CaCO3 is heated to decompose bubbles, which can promote the subsequent high-temperature reaction kinetics and play a stirring role.

[0020] Furthermore, in component B, by mass, CaF2 is 80 to 92 parts, SiO2 is 3.7 to 6.3 parts, CaCO3 is 1.2 to 2.0 parts, and NaCl is 13 to 15 parts.

[0021] Furthermore, component B is fluorite with a water content of less than 1%, the mass fraction of fixed CaF2 in the fluorite is not less than 80%, and the fluorite is continuously dried at 120° C. for at least 5 hours.

[0022] Furthermore, in the C component, the mass percentage of Na2O is 3.56% to 6.88% and the mass percentage of K2O is 6.03% to 7.87%.

[0023] Furthermore, in the C component, the sum of the mass percentages of Na2O and K2O is 11.31-13.56%.

[0024] Furthermore, the C component includes quicklime and glass cullets.

[0025] Furthermore, the main substances in the glass cullets are: SiO2 is 73.93%, Al2O3 is 4.13%, CaO is 10.02%, and Na2O+K2O is 11.31%.

[0026] Furthermore, by weight, 3.4 to 3.9 parts of component A, 3.0 to 3.8 parts of component B, and 36.5 to 58.4 parts of component C are used.

[0027] As a second aspect of the present application, when the above-mentioned tempering and modifying agent is used to temper and modify the vanadium-containing steel slag, the temperature of the molten vanadium-containing steel slag needs to be controlled to be above 1350°C.

[0028] 3. Beneficial effects

[0029] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0030] (1) The tempering modifier of the present invention directly performs thermal modification on the molten vanadium-containing steel slag, making full use of the waste heat of the molten vanadium-containing steel slag; by adding the tempering modifier, the final product of the vanadium-containing steel slag meets the application standard of cement clinker; in general, the tempering modifier of the present invention mainly acts on two aspects: one is to adjust the composition of the vanadium-containing steel slag to be consistent with the cement clinker, and the other is to change the performance of the vanadium-containing steel slag to meet the cement clinker standard; it solves the problems of uneven mixing of the existing modified material and high-temperature steel slag, insufficient modification, and large investment and high operating costs of the existing steel slag modification process.

[0031] (2) The tempering modifier of the present invention can not only reduce the total iron content in vanadium-containing steel slag, modify the original harmful vanadium oxides in the vanadium-containing steel slag into harmless alkali metal vanadium salts (sodium vanadate or potassium vanadate), further reduce the vanadium content in the original steel slag, and improve the activity of the vanadium-containing steel slag, but also make the composition of the vanadium-containing steel slag match that of cement clinker, further expanding the utilization of vanadium-containing steel slag in the preparation of cement clinker; by adjusting the proportion of the tempering modifier components and the temperature, the final product of cement clinker prepared from vanadium-containing steel slag is mainly C3S, C2S, C3A, and C4AF, wherein the content of C3S is greater than 50%, and the total amount of C3S and C2S is more than 75%, reaching the application standard of cement clinker components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a morphology diagram of the vanadium-containing steel slag tempering modifier in Examples 1 to 4;

[0033] Figure 2 The effect of calcination temperature on the reduction performance of iron in vanadium-containing steel slag under the conditions of Si content of 3.5% and calcination time of 50 min.

[0034] Figure 3 Schematic diagram of cement clinker in Examples 1 to 4;

[0035] Figure 4 This is a diagram showing the main components of the vanadium-containing steel slag tempering modifier of Example 4;

[0036] Figure 5This is the relationship between the standard Gibbs free energy of the reaction between iron oxide and Si powder and temperature;

[0037] Figure 6 In order to add anion F -1 (Adding CaF2) shows the relationship between the free calcium oxide content and temperature. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with specific embodiments.

[0039] In order to better understand the present invention, the present invention is further described below through specific implementation methods, but the exemplified embodiments do not limit the protection scope of the present invention.

[0040] Example 1

[0041] A molten vanadium-containing steel slag tempering modifier of this embodiment includes, by weight, 3.5 parts of component A: Si powder;

[0042] 3.0 parts of component B: CaF2 particles, less than 3 mm in diameter;

[0043] 36.5 parts of component C: 88.57% quicklime, 3.56% Na2O and 7.87% K2O, the particles are broken into pieces with a diameter of less than 3 mm. The appearance of the vanadium-containing steel slag tempering modifier 1 of this embodiment is shown in detail. Figure 1 .

[0044] The quenching and tempering modifier of this embodiment utilizes the high temperature characteristics of the converter slag after it is discharged to modify it, so as to fully utilize the residual calorific value, reduce the amount of coal powder used in the calcination process, and reduce the comprehensive energy consumption and production cost of the unit product of silicate cement clinker. Of course, under natural conditions, the heat dissipation of the steel slag surface is fast, and the internal heat dissipation is slow, resulting in the external heat dispersion of the steel slag, the short duration of heat, and the formation of low temperature and long burning; the middle part of the steel slag is rapidly burned at high temperature and the heat is quite concentrated, which eventually leads to an increase in the free calcium oxide of the clinker, and the content of the main components C3S, C2S, C3A, and C4AF in the clinker does not meet the standards. Therefore, if the steel slag is not additionally heated, the high temperature duration is not enough to complete the modification and modification calcination of the vanadium-containing steel slag. Therefore, during the use of the quenching and tempering modifier of the present invention, the temperature of the molten vanadium-containing steel slag is controlled to be above 1350°C to ensure the smoothness of the modification process.

[0045] Therefore, the vanadium-containing steel slag tempering agent 1 of this embodiment is added to 100 parts of molten vanadium-containing steel slag, and the temperature of the molten vanadium-containing steel slag is kept at more than 1350°C (from Figure 2It can be seen from the figure that when the temperature is greater than 1350°C, the reduction rate of iron in the steel slag is about 90%). The molten vanadium-containing steel slag is modified, modified, and quenched and tempered for 50 minutes. After natural cooling, cement clinker 1 is obtained. Its main chemical composition is shown in Table 3, its main products are shown in Table 4, and the appearance of the finished product is shown in Table 5. Figure 3 shown.

[0046] It can be seen from the table that the main chemical components of the cement clinker prepared by the vanadium-containing steel slag conditioning modifier prepared in Example 1 are close to the main components of the clinker of a domestic cement plant, namely CaO, Al2O3, and SiO2. Among them, CaO accounts for 66.45%. The final product of cement clinker is mainly C3S, C2S, C3A, and C4AF, among which the content of C3S is 52.14%, and the total amount of C3S and C2S reaches 75.48%, reaching the application standard of cement clinker components.

[0047] Example 2

[0048] A molten vanadium-containing steel slag tempering modifier of this embodiment includes, by weight, 3.4 parts of component A: Si powder;

[0049] 3.2 parts of component B: 86.9% CaF2, 13.1% NaCl granules, diameter less than 3mm;

[0050] 40 parts of component C: 87.48% quicklime, 5.49% Na2O and 6.03% K2O, in fine particles with a diameter less than 3 mm.

[0051] The vanadium-containing steel slag tempering modifier 2 of this embodiment has a specific appearance as shown in Figure 1 , add 100 parts of molten vanadium-containing steel slag, and pay attention to keeping the temperature of the molten vanadium-containing steel slag always greater than 1350°C during the quenching and modification process. The molten vanadium-containing steel slag is modified, modified, and quenched and tempered respectively for 50 minutes, and naturally cooled to obtain cement clinker 2. Its main chemical components are shown in Table 3, the main products are shown in Table 4, and the finished product appearance is shown in Table 4. Figure 3 shown.

[0052] Similarly, it can be seen from the table that the main chemical components and final products of cement clinker prepared by the vanadium-containing steel slag tempering modifier in Example 2 basically meet the application standards of cement clinker. The C3S content is 52.41%, and the total amount of C3S and C2S is 75.40%, which basically meets the needs of cement plants. In addition, compared with the vanadium-containing tempering modifier prepared in Example 1, 13.1% of NaCl particles are introduced into the B component of the vanadium-containing steel slag tempering modifier, and other components are adjusted to further reduce the content of vanadium pentoxide in the vanadium-containing steel slag, but there is no obvious change in the main product of cement clinker.

[0053] Example 3

[0054] A molten vanadium-containing steel slag tempering modifier of this embodiment includes 3.7 parts by weight of component A: Si powder;

[0055] 3.5 parts of component B: 79.1% CaF2, 13.84% NaCl, 5.11% SiO2 and 1.95% CaCO3, in fine particles with a diameter less than 3 mm;

[0056] 49 parts of component C: 86.49% quicklime, 6.88% Na2O and 6.63% K2O, in fine particles with a diameter less than 3 mm.

[0057] The vanadium-containing steel slag tempering modifier 3 of this embodiment has a specific appearance as shown in Figure 6 , add 100 parts of molten vanadium-containing steel slag, and pay attention to keeping the temperature of the molten vanadium-containing steel slag always greater than 1350°C during the quenching and modification process. The molten vanadium-containing steel slag is modified, modified, and quenched and tempered respectively for 50 minutes, and naturally cooled to obtain cement clinker 3, whose main chemical components are shown in Table 3, the main products are shown in Table 4, and the finished product appearance is shown in Figure 3 shown.

[0058] Similarly, first of all, it can be seen from the table that the main chemical composition of the cement clinker prepared by the vanadium-containing steel slag tempering modifier prepared in Example 3 is close to the main component of the clinker of a domestic cement plant, and the final product also basically reaches the application standard of the cement clinker component. In addition, since 13.84% NaCl, 5.11% SiO2 and 1.95% CaCO3 are introduced into the tempering modifier B component, this can reduce the content of vanadium pentoxide in the vanadium-containing steel slag, and at the same time reduce the temperature of the clinker liquid phase and the viscosity of the liquid phase, and CaCO3 is heated to decompose bubbles, which can promote the subsequent high-temperature reaction kinetics, play a stirring role, and promote more C2S to be converted into C3S. Therefore, in this implementation case, the C3S content increases to 57.34%, the C2S content decreases to 19.96%, and the total amount of C3S and C2S reaches 77.30%, which basically meets the needs of the cement plant.

[0059] Example 4

[0060] This embodiment uses fluorite as component B, wherein after pretreatment, the proportions of various components in the fluorite are controlled to be: CaF2 is 80.1%, SiO2 is 3.7%, CaCO3 is 1.2%, NaCl is 15%, and the water content is less than 1%.

[0061] In this embodiment, the C component contains glass powder, and the main substances are: SiO2 is 73.93%, Al2O3 is 4.13%, CaO is 10.02%, Na2O+K2O is 11.31% (4.13% Na2O and 7.18% K2O), and the rest are impurities.

[0062] A molten vanadium-containing steel slag tempering modifier of this embodiment includes, by weight, 3.9 parts of component A: Si powder;

[0063] 3.8 parts of component B: fluorite particles, less than 3 mm in diameter;

[0064] 58.4 parts of component C: 73.88% of quicklime particles, 16.41% of glass particles, 4.16% of Na2O and 5.55% of K2O, with a diameter less than 3 mm.

[0065] The main components of the vanadium-containing steel slag tempering agent in this example, such as Si powder, fluorite, quicklime, etc., are shown in FIG. Figure 4 .

[0066] The vanadium-containing steel slag tempering modifier 4 of this embodiment is shown in detail. Figure 1 , add 100 parts of vanadium-containing molten steel slag, and pay attention to keeping the temperature of the molten vanadium-containing steel slag always greater than 1350°C during the quenching and modification process. The molten vanadium-containing steel slag is modified, modified, and quenched and tempered respectively for 50 minutes, and cooled naturally to obtain cement clinker 4, whose main chemical components are shown in Table 3, the main products are shown in Table 4, and the finished product appearance is shown in Table Figure 3 shown.

[0067] Similarly, first of all, it can be seen from the table that the main chemical components and final products of cement clinker prepared by the vanadium-containing steel slag conditioning modifier in Example 4 basically meet the application standards of cement clinker. Since the vanadium-containing steel slag conditioning modifier used in this implementation case uses fluorite particles in component B (the proportion of each component in fluorite is: CaF2 is 80.1%, SiO2 is 3.7%, CaCO3 is 1.2%, and NaCl is 15%), and glass powder is used in component C (SiO2 is 73.93%, Al2O3 is 4.13%, CaO is 10.02%, and Na2O+K2O is 11.31%). Compared with the tempering modifier prepared in Example 3, the vanadium-containing steel slag tempering modifier used in this implementation case further increases the C3S content in the cement clinker to 60.45%, the total amount of C3S and C2S to 77.57%, and C3A and C4AF also increase to 6.13% and 13.91%, respectively.

[0068] Before developing the tempering modifier of the present application, the applicant studied the reaction principle of silicon powder to iron oxides in steel slag and found that adding a certain amount of silicon powder can control the total iron content. The reaction equation of silicon powder added to molten steel slag is Formula 1):

[0069] 2Fe2O3(s)+3Si(s)=3SiO2(s)+4Fe(s)1)

[0070] According to the principles of thermodynamics, the standard enthalpy change ΔHθ, standard entropy change ΔSθ, and standard formation free energy ΔGθ are known, kJ·mol -1 ·K -1 As shown in formulas 2) to 4):

[0071] ΔHθ=∑ΔHθ(product)-ΔHθ(reactant) 2)

[0072] ΔSθ=∑ΔSθ(product)-ΔSθ(reactant) 3)

[0073] ΔGθ=ΔHθ-TΔSθ 4)

[0074] Based on 1 mol of iron oxide, the standard Gibbs free energy of Si reducing iron oxide in steel slag and the temperature calculated according to the above formula is: -547.88+0.011T (ΔGθ / kJ·mol -1 ), see Figure 5 According to the figure, it can be seen that the reduction of iron oxides in steel slag by Si as a reducing agent is an exothermic reaction. As the temperature increases, the Gibbs free energy gradually increases, but basically maintains at -600 to -500 kJ·mol -1 , under the same conditions, formula 1) can be carried out smoothly at high temperature.

[0075] It should be noted that the tempering modifier of the present invention can well change the flow characteristics of steel slag by adding a certain amount of B component, preferably fluorite, as a flux, and the addition of fluorite can increase the activity of steel slag. More beneficially, fluorite can be used as a mineralizer. The main substance in fluorite is CaF2. Figure 6 (Comparative Example is basically the same as Example 1, except that it does not contain CaF2). - Introduce, add F into the steel slag -1After that, the content of free calcium oxide in the clinker shows a greater downward trend with the increase of temperature, so that the silicate content in the final sintered product increases. Of course, when using the tempering modifier, NaCl in fluorite is combined with Na2O and K2O in the C component, and preferably glass powder can reduce the temperature at which the clinker liquid phase appears and reduce the viscosity of the liquid phase, thereby promoting the generation of more liquid phases. At the same temperature at which C3S can be generated, the more flux (liquid phase) there is, the more CaO C2S absorbs in the liquid phase, and tricalcium silicate can also be formed relatively quickly, further playing the role of a mineralizer. In addition, the Na2O and K2O added to the tempering agent can also reduce the vanadium pentoxide in the vanadium-containing steel slag, further promoting the formation of cement clinker in the slag, and the specific reaction formulas are shown in 5) and 6). On the basis of adding fluorite, the C component also adds quicklime as an alkaline flux. The increase in quaternary alkalinity causes Al2O3 to dissociate. At this time, the liquid viscosity will show a downward trend, and the ion mobility will continue to increase under this trend, prompting the generation of C3S, which is beneficial to the high-temperature calcination of steel slag. However, the continuous increase of CaO will further increase the alkalinity of steel slag, which does not meet the calcination requirements of cement clinker.

[0076] Na2O+V2O5=Na3VO4 5)

[0077] K2O+V2O5=K3VO4 6)

[0078] The applicant measured the main components of vanadium-containing steel slag from a domestic steel plant and the main components of clinker from a domestic cement plant, as shown in Tables 1 and 2. Comparing the cement clinkers 1 to 4 obtained by adding a tempering modifier to molten vanadium-containing steel slag in Examples 1 to 4 of the present application, it can be seen that the main chemical components of the cement clinker obtained in the present application are close to the main components of clinker from a domestic cement plant, and the content also basically meets the application standards.

[0079] Table 1 Main components of steel slag from a domestic steel plant

[0080]

[0081] Table 2 Main components of clinker from a domestic cement plant

[0082]

[0083] Table 3 Main chemical components of silicate cement clinker obtained in Examples 1 to 4

[0084]

[0085] Table 4 Main products of silicate cement clinker obtained in Examples 1 to 4

[0086]

[0087] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The figures shown in the drawings are only one of the application implementation methods of the present invention under the standard of silicate cement produced by a cement plant. At the same time, the implementation case shows that the vanadium-containing steel slag tempering modifier of the present invention can be used to produce silicate cement clinker, and the finished product basically meets the application standard. Therefore, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention, without creatively designing structural methods and embodiments similar to the technical solution, they should all fall within the scope of protection of the present invention.

Claims

1. A molten vanadium-containing steel slag tempering modifier, characterized in that: include: Component A: Si powder; Component B: mainly includes CaF2; Component C: mainly includes quicklime, Na2O and K2O.

2. The molten vanadium-containing steel slag tempering and modifying agent according to claim 1, characterized in that: The B component also includes NaCl.

3. The molten vanadium-containing steel slag tempering and modifying agent according to claim 2, characterized in that: Component B also includes SiO2 and CaCO3.

4. The molten vanadium-containing steel slag tempering and modifying agent according to claim 3, characterized in that: In component B, by mass, CaF2 is 80 to 92 parts, SiO2 is 3.7 to 6.3 parts, CaCO3 is 1.2 to 2.0 parts, and NaCl is 13 to 15 parts.

5. The molten vanadium-containing steel slag tempering and modifying agent according to claim 1, characterized in that: Component B is fluorite with a water content of less than 1%.

6. The molten vanadium-containing steel slag tempering and modifying agent according to claim 1, characterized in that: The C component contains 3.56% to 6.88% by mass of Na2O and 6.03% to 7.87% by mass of K2O.

7. A molten vanadium-containing steel slag tempering and modifying agent according to claim 6, characterized in that: In component C, the sum of the mass percentages of Na2O and K2O is 11.31-13.56%.

8. The molten vanadium-containing steel slag tempering and modifying agent according to claim 1, characterized in that: Component C includes quicklime and glass cullets. The main substances in the glass cullets are: SiO2 is 73.93%, Al2O3 is 4.13%, CaO is 10.02%, and the sum of the mass percentages of Na2O and K2O is 11.31%.

9. A molten vanadium-containing steel slag tempering and modifying agent according to any one of claims 1 to 8, characterized in that: Calculated by weight, the composition comprises: 3.4 to 3.9 parts of component A, 3.0 to 3.8 parts of component B, and 36.5 to 58.4 parts of component C.

Images