A quenched and tempered vanadium-containing steel slag modifier

Abstract

The application discloses a molten vanadium-containing steel slag tempering modifier and belongs to the technical field of comprehensive utilization of metallurgical slag resources. The tempering modifier is composed of the following components: A component: Si powder; B component: mainly including CaF2; and C component: mainly including quicklime, Na2O and K2O. The tempering modifier is directly used for molten vanadium-containing steel slag when the converter is slagged, and the waste heat of the molten steel slag is fully utilized. By adding the tempering modifier, the final formation product of the vanadium-containing steel slag meets the application standard of cement clinker.

Description

Technical Field

[0001] This invention relates to a new field of comprehensive utilization of metallurgical slag resources, and more specifically, to a molten vanadium-containing steel slag conditioning and modifying agent. Background Technology

[0002] Analysis revealed that the mineral phase composition of vanadium-containing steel slag mainly consists of tricalcium silicate, dicalcium silicate, tricalcium aluminate, ferric vanadate, and tetracalcium aluminoferrite, along with small amounts of RO phase, free CaO, free MgO, and unseparated elemental iron, similar to the composition of silicate cement clinker. Research in my country on slag as an admixture for cement clinker preparation began in the 1950s and 60s. In the early 1970s, the China Building Materials Academy was the first to conduct related research on steel slag as a cement admixture. Subsequently, a series of studies emerged on using industrial waste such as desulfurization slag, fly ash, and blast furnace slag as novel mineral admixtures for cement clinker preparation. The application of mineral admixtures in cement clinker preparation not only utilizes industrial waste in cement production, reducing environmental pollution and land occupation caused by waste phases, but also lowers the manufacturing cost and resource consumption of concrete. Nevertheless, research on the application of vanadium-containing steel slag in the cement industry still faces certain challenges and numerous problems. Therefore, the key reason why vanadium-containing steel slag has not been utilized on a large scale lies in its low activity, poor workability, and large compositional fluctuations. On the other hand, its limited use in cement concrete, coupled with high production costs and poor economic viability, also contributes to its challenges. To further realize the large-scale application of vanadium-containing steel slag, it is necessary to activate its activity to address these problems.

[0003] In existing technologies, the current approach to addressing the problems of low activity and poor workability of vanadium-containing steel slag is to improve its activity by using activity activators, as can be seen from research:

[0004] Chinese Invention Patent Application No. 202111246361.0, Publication Date: January 7, 2022, Invention Title: A Composite Steel Slag Activator and Its Preparation Method and Steel Slag Cement. Chinese Invention Patent Application No. 202111284809.8, Publication Date: December 31, 2021, Invention Title: A Steel Slag Activator and Activated Steel Slag.

[0005] Both of the aforementioned invention patents involve preparing a steel slag activator by mainly using desulfurized gypsum and alkaline slag in proportions, along with other substances, and then mixing it with steel slag powder and cement to prepare steel slag cement.

[0006] For example, Chinese invention patent application number 202211128811.0, application publication date: December 6, 2022, invention title: A steel slag early activity activator and its preparation method and application. This invention patent mainly prepares a steel slag early activity activator by mixing quicklime 10-25%, diethanol monoisopropanolamine 5-15%, and metakaolin 30-45%. 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 workability. Furthermore, by improving the activity of steel slag, the amount of steel slag used in cementitious materials can be further increased, which has a positive effect on reducing the amount of cement used and improving the comprehensive utilization rate of steel slag.

[0007] The aforementioned patents all demonstrate that using this activator can indeed improve the activity of steel slag, and that the raw materials for the activator are inexpensive, achieving multiple optimizations in economic, social, and environmental benefits through the reuse of waste steel slag and slag. However, from the perspective of maximizing the utilization of steel slag resources, due to the differences between the composition of steel slag and cement, if the problem is only considered from the perspective of changing the activity, then the application of steel slag in the cement field is destined not to maximize resource utilization. The starting point of the aforementioned patents is merely how to improve the activity of a certain amount of steel slag in cement by using an activator, so as to further improve the cement performance or not affect it, thus achieving full utilization of steel slag. Moreover, the degree of activity improvement of steel slag when using an activator is limited.

[0008] Furthermore, research revealed that the aforementioned known technologies are limited to the use of ordinary steel slag, with almost no coverage of the resource utilization of vanadium-containing steel slag produced by vanadium blowing (or vanadium pentoxide) production. However, with the widespread application of new energy batteries, vanadium pentoxide, as a raw material for vanadium redox flow batteries, is being used extensively, leading to a large-scale generation of vanadium-containing steel slag. How to effectively utilize low-vanadium-content steel slag is currently a challenging technical problem. Therefore, there is an urgent need for a vanadium-containing steel slag conditioning and modifying agent to convert vanadium pentoxide in the steel slag into harmless alkali metal salts, thereby ensuring that the final product formed from the vanadium-containing steel slag meets the application standards for cement clinker. Summary of the Invention

[0009] 1. The technical problem that the invention aims to solve

[0010] The purpose of this invention is to provide a molten vanadium-containing steel slag conditioning and modifying agent to solve the problem of low utilization rate of existing vanadium-containing steel slag. By optimizing the formulation of the conditioning and modifying agent, molten vanadium-containing steel slag can be directly converted into cement clinker that meets the standards, thus expanding the application scope of vanadium-containing steel slag in the preparation of cement clinker.

[0011] 2. Technical Solution

[0012] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0013] As a first aspect of this application, this application provides a molten vanadium-containing steel slag conditioning and modifying agent, 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 molten vanadium-containing steel slag;

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

[0016] It should be noted that components A and B are used for the modification of vanadium-containing steel slag, while component C is used for the upgrading of vanadium-containing steel slag.

[0017] Furthermore, the particle diameter of components B and C is less than 3 mm.

[0018] Furthermore, component B also includes NaCl.

[0019] Furthermore, component B also includes SiO2 and CaCO3. SiO2 can adjust the pH of vanadium-containing steel slag, reducing the amount of quicklime required. CaCO3, upon heating, decomposes bubbles, promoting the kinetics of subsequent high-temperature reactions and acting as a stirrer.

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

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

[0022] Furthermore, component C contains 3.56%–6.88% Na₂O and 6.03%–7.87% K₂O by mass.

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

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

[0025] Furthermore, the main components of the glass fragments are: SiO2 73.93%, Al2O3 4.13%, CaO 10.02%, and Na2O+K2O 11.31%.

[0026] Further, by weight, there are 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.

[0027] As a second aspect of this application, when the above-mentioned quenching and tempering modifier modifies vanadium-containing steel slag, the temperature of the molten vanadium-containing steel slag needs to be controlled above 1350°C.

[0028] 3. Beneficial effects

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

[0030] (1) The quenching and modifying agent of the present invention directly modifies the molten vanadium-containing steel slag in a hot state, making full use of the residual heat of the molten vanadium-containing steel slag; by adding the quenching and modifying agent, the final product formed by the vanadium-containing steel slag meets the application standards of cement clinker; in general, the quenching and modifying agent of the present invention mainly acts on two aspects: first, adjusting the composition of the vanadium-containing steel slag to be consistent with that of cement clinker, and second, changing the properties of the vanadium-containing steel slag to meet the standards of cement clinker; it solves the problems of uneven mixing of existing modifiers with high-temperature steel slag, insufficient modification, and high investment and operating costs of existing steel slag modification processes.

[0031] (2) The conditioning modifier of the present invention can not only reduce the total iron content in vanadium-containing steel slag and modify the original harmful vanadium oxides in 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 vanadium-containing steel slag, but also make the composition of 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 conditioning modifier components and the temperature, the final product of cement clinker prepared from vanadium-containing steel slag is mainly composed of C3S, C2S, C3A, and C4AF, of which the C3S content is greater than 50% and the total amount of C3S and C2S reaches more than 75%, which meets the application standards of cement clinker components. Attached Figure Description

[0032] Figure 1 Images of the vanadium-containing steel slag conditioning and modifying agents used in Examples 1-4;

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

[0034] Figure 3 These are schematic diagrams of cement clinker in Examples 1-4;

[0035] Figure 4 The image shows the main components of the vanadium-containing steel slag conditioning and modifying agent in Example 4.

[0036] Figure 5The graph shows the relationship between the standard Gibbs free energy of the reaction between iron oxide and Si powder and temperature.

[0037] Figure 6 To add anion F -1 The curve showing the relationship between the free calcium oxide content and temperature after the addition of CaF2. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments.

[0039] To better understand the present invention, the present invention will be further described below through specific embodiments, but the exemplified embodiments do not limit the scope of protection of the present invention.

[0040] Example 1

[0041] This embodiment of a molten vanadium-containing steel slag conditioning and modifying agent comprises, by weight, 3.5 parts of component A: Si powder;

[0042] Component B, 3.0 parts: CaF2 granular powder, less than 3 mm in diameter;

[0043] Component C, 36.5 parts: 88.57% quicklime, 3.56% Na₂O, and 7.87% K₂O, in fine powder form with a diameter less than 3 mm. The morphology of the vanadium-containing steel slag conditioning modifier 1 in this embodiment is shown in the attached image. Figure 1 .

[0044] The quenching and modifying agent in this embodiment utilizes the high-temperature characteristics of the slag after converter discharge to modify it, thereby fully utilizing the residual calorific value, reducing the amount of pulverized coal used in the calcination process, and lowering the overall energy consumption and production cost per unit product of silicate cement clinker. However, under natural conditions, the surface of steel slag dissipates heat quickly while the interior dissipates heat slowly, resulting in dispersed external heat, short heat duration, and prolonged low-temperature burning; the middle part of the steel slag undergoes rapid high-temperature burning with highly concentrated heat, ultimately leading to an increase in free calcium oxide in the clinker. The content of the main components C3S, C2S, C3A, and C4AF in the clinker does not meet the standards. Therefore, without additional heating of the steel slag, the duration of the high-temperature period is insufficient to complete the modification and calcination of the vanadium-containing steel slag. Thus, the quenching and modifying agent of this invention controls the temperature of the molten vanadium-containing steel slag above 1350℃ during use to ensure the smoothness of the modification process.

[0045] Therefore, the vanadium-containing steel slag quenching and modifying agent 1 of this embodiment is added to 100 parts of molten vanadium-containing steel slag, while ensuring that the temperature of the molten vanadium-containing steel slag is maintained above 1350℃ throughout the quenching and modifying process (from...). Figure 2As can be seen from the data, when the temperature is above 1350℃, the reduction rate of iron in steel slag is about 90%. Molten vanadium-containing steel slag was subjected to modification, alteration, and conditioning for 50 minutes, followed by natural cooling to obtain cement clinker 1. Its main chemical composition is shown in Table 3, and its main products are shown in Table 4. The appearance of the finished product is as follows. Figure 3 As shown.

[0046] As shown in the table, the main chemical composition of the cement clinker prepared using the vanadium-containing steel slag conditioning modifier prepared in Example 1 is similar to that of the clinker from a domestic cement plant, namely CaO, Al2O3, and SiO2. CaO accounts for 66.45%. The final product of the cement clinker is mainly composed of C3S, C2S, C3A, and C4AF, with C3S content at 52.14%. The total content of C3S and C2S reaches 75.48%, meeting the application standards for cement clinker composition.

[0047] Example 2

[0048] This embodiment of a molten vanadium-containing steel slag conditioning and modifying agent comprises, by weight, 3.4 parts of component A: Si powder;

[0049] Component B, 3.2 parts: 86.9% CaF2, 13.1% NaCl particles (less than 3 mm in diameter);

[0050] Component C (40 parts): 87.48% quicklime, 5.49% Na2O and 6.03% K2O, in fine powder form with a diameter of less than 3 mm.

[0051] The morphology of the vanadium-containing steel slag conditioning and modifying agent 2 in this embodiment is shown in the following figure. Figure 1 Add 100 parts of molten vanadium-containing steel slag, while ensuring that the temperature of the molten vanadium-containing steel slag is maintained above 1350℃ throughout the conditioning and modification process. The molten vanadium-containing steel slag is then subjected to conditioning, modification, and tempering processes for 50 minutes each, followed by natural cooling to obtain cement clinker 2. Its main chemical composition is shown in Table 3, and its main products are shown in Table 4. The finished product appearance is as follows. Figure 3 As shown.

[0052] Similarly, as shown in the table, the main chemical composition and final product of the cement clinker prepared by the vanadium-containing steel slag conditioning modifier in Example 2 basically meet the application standards for cement clinker. The C3S content is 52.41%, and the total C3S and C2S content reaches 75.40%, which basically meets the requirements of cement plants. Furthermore, compared to the vanadium-containing conditioning modifier prepared in Example 1, this vanadium-containing steel slag conditioning modifier introduces 13.1% NaCl particles in component B and adjusts other components to further reduce the vanadium pentoxide content in the vanadium-containing steel slag, but the main products of the cement clinker show no significant change.

[0053] Example 3

[0054] This embodiment of a molten vanadium-containing steel slag conditioning and modifying agent comprises, by weight, 3.7 parts 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, with fine particles and a diameter of less than 3 mm;

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

[0057] The morphology of the vanadium-containing steel slag conditioning and modifying agent 3 in this embodiment is shown in the following figure. Figure 6 Add 100 parts of molten vanadium-containing steel slag, while ensuring that the temperature of the molten vanadium-containing steel slag is maintained above 1350℃ throughout the conditioning and modification process. The molten vanadium-containing steel slag is then subjected to conditioning, modification, and tempering processes for 50 minutes each, followed by natural cooling to obtain cement clinker 3. Its main chemical composition is shown in Table 3, and its main products are shown in Table 4. The appearance of the finished product is as follows. Figure 3 As shown.

[0058] Similarly, as shown in the table, the main chemical composition of the cement clinker prepared using the vanadium-containing steel slag conditioning modifier in Example 3 is close to that of the clinker from a domestic cement plant, and the final product basically meets the application standards for cement clinker composition. Furthermore, the introduction of 13.84% NaCl, 5.11% SiO2, and 1.95% CaCO3 into component B of this conditioning modifier reduces the vanadium pentoxide content in the vanadium-containing steel slag. This also lowers the temperature and viscosity of the clinker liquid phase. Moreover, the decomposition of CaCO3 bubbles upon heating promotes the subsequent high-temperature reaction kinetics, acting as a stirrer and facilitating the conversion of more C2S to C3S. Therefore, in this embodiment, the C3S content increases to 57.34%, the C2S content decreases to 19.96%, and the total C3S and C2S content reaches 77.30%, basically meeting the requirements of cement plants.

[0059] Example 4

[0060] In this embodiment, fluorite is used as component B. After pretreatment, the proportions of each component in the fluorite are controlled as follows: CaF2 80.1%, SiO2 3.7%, CaCO3 1.2%, NaCl 15%, and water content less than 1%.

[0061] In this embodiment, component C contains glass fragments, and the main components are: 73.93% SiO2, 4.13% Al2O3, 10.02% CaO, and 11.31% Na2O+K2O (4.13% Na2O and 7.18% K2O), with the remainder being impurities.

[0062] This embodiment of a molten vanadium-containing steel slag conditioning and modifying agent comprises, by weight, 3.9 parts of component A: Si powder;

[0063] Component B, 3.8 parts: fluorite particles and fragments, less than 3 mm in diameter;

[0064] Component C, with a diameter of 58.4 parts, consists of 73.88% quicklime granules, 16.41% glass fragments, 4.16% Na2O, and 5.55% K2O.

[0065] The main components of the vanadium-containing steel slag conditioning and modifying agent in this embodiment, such as Si powder, fluorite, and quicklime, are shown in the following images. Figure 4 .

[0066] The morphology of the vanadium-containing steel slag conditioning and modifying agent 4 in this embodiment is shown in the following figure. Figure 1 Add 100 parts of vanadium-containing molten steel slag, while ensuring that the temperature of the molten vanadium-containing steel slag is maintained above 1350℃ throughout the tempering and modification process. The molten vanadium-containing steel slag is then subjected to tempering, modification, and conditioning for 50 minutes each, followed by natural cooling to obtain cement clinker 4. Its main chemical composition is shown in Table 3, and its main products are shown in Table 4. The finished product appearance is as follows. Figure 3 As shown.

[0067] Similarly, as can be seen from the table, the main chemical composition and final product of the cement clinker prepared by the vanadium-containing steel slag conditioning modifier in Example 4 basically meet the application standards of cement clinker. In this embodiment, the vanadium-containing steel slag conditioning modifier used has the following components: Component B uses fluorite particles (the proportions of each component in fluorite are: CaF2 80.1%, SiO2 3.7%, CaCO3 1.2%, NaCl 15%), and Component C uses glass fragments (SiO2 73.93%, Al2O3 4.13%, CaO 10.02%, Na2O+K2O 11.31%). Compared with the conditioning modifier prepared in Example 3, the vanadium-containing steel slag conditioning modifier used in this embodiment further increases the C3S content in cement clinker to 60.45%, the total amount of C3S and C2S to 77.57%, and C3A and C4AF to 6.13% and 13.91%, respectively.

[0068] Before developing the tempering modifier of this application, the applicant conducted research on the reaction mechanism of silicon powder on iron oxides in steel slag and found that adding a certain amount of silicon powder to control the total iron content, the reaction equation of silicon powder added to molten steel slag is Equation 1):

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

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

[0071] ΔHθ=∑ΔHθ(products)-ΔHθ(reactants) 2)

[0072] ΔSθ=∑ΔSθ(products)-ΔSθ(reactants) 3)

[0073] ΔGθ=ΔHθ-TΔSθ 4)

[0074] Based on 1 mol of iron oxide, the standard Gibbs free energy of iron oxide in Si-reduced steel slag, calculated according to the above formula, is as follows: -547.88 + 0.011T(ΔGθ / kJ·mol⁻¹) -1 See details. Figure 5 Furthermore, as shown in the figure, the reduction of iron oxides in steel slag by Si as a reducing agent is an exothermic reaction. With increasing temperature, the Gibbs free energy gradually increases, but remains essentially between -600 and -500 kJ·mol⁻¹. -1 Under the same conditions, formula 1) can be performed smoothly at high temperatures.

[0075] It should be noted that the quenching and tempering modifier of the present invention, by adding a certain amount of component B, preferably fluorite, acts as a flux and effectively alters the flow characteristics of steel slag. Furthermore, the addition of fluorite increases the activity of the steel slag. More advantageously, fluorite can also act as a mineralizing agent. The main component of fluorite is CaF2. Figure 6 (The comparative example is basically the same as Example 1, except that it does not contain CaF2), compared to F - F is introduced into steel slag. -1Subsequently, the content of free calcium oxide in the clinker showed a greater decreasing trend with increasing temperature, resulting in an increase in the silicate content in the final calcined product. Of course, when using this conditioning modifier, the NaCl in fluorite, combined with Na₂O and K₂O in the C component, and preferably glass fragments, can lower the temperature at which the liquid phase appears in the clinker and reduce the viscosity of the liquid phase, promoting the formation of more liquid phase. At the same temperature at which C₃S can be formed, the more flux (liquid phase) there is, the more CaO C₂S absorbs in the liquid phase, and tricalcium silicate can also form relatively quickly, further acting as a mineralizer. In addition, the Na₂O and K₂O added to the conditioning agent can also reduce vanadium pentoxide in vanadium-containing steel slag, further promoting the formation of cement clinker in the slag, as shown in the specific reaction formulas (5) and (6). In addition to fluorite, quicklime is added to component C as an alkaline flux. The increase in quaternary basicity causes Al2O3 to dissociate, which leads to a decrease in liquid phase viscosity. Under this trend, the ion mobility is continuously enhanced, promoting the production of C3S, which is beneficial for the high-temperature calcination of steel slag. However, the continuous increase in CaO will further increase the basicity of steel slag, thus failing to 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, respectively. Comparing the cement clinker 1-4 obtained by adding a conditioning modifier to molten vanadium-containing steel slag in Examples 1-4 of this application, it can be seen that the main chemical components of the cement clinker obtained in this application are close to the main components of the clinker from a domestic cement plant, and the content 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 cement plant in China

[0082]

[0083] Table 3. Main chemical components of silicate cement clinker prepared in Examples 1-4

[0084]

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

[0086]

[0087] The invention and its embodiments have been described above illustratively. This description is not restrictive, and the accompanying drawings only illustrate one application of the invention using silicate cement produced by a specific cement plant as a standard. Furthermore, the examples demonstrate that this vanadium-containing steel slag conditioning modifier can be used to produce silicate cement clinker, and the finished product basically meets the application standards. Therefore, if those skilled in the art are inspired by this description and, without departing from the spirit of this invention, design similar structures and embodiments without creative intent, all such designs should fall within the scope of protection of this invention.

Claims

1. A molten vanadium-containing steel slag conditioning and modifying agent, characterized in that: Based on 100 parts by weight of molten vanadium-containing steel slag, the raw materials of the quenching and tempering modifier are: 3.4 to 3.9 parts of component A, wherein component A is Si powder; 3.0 to 3.8 parts of component B, wherein component B is CaF2; The component C comprises 36.5 to 58.4 parts of quicklime, Na2O and K2O; wherein the component C contains 3.56% to 6.88% by mass of Na2O and 6.03% to 7.87% by mass of K2O.

2. The molten vanadium-containing steel slag conditioning and modifying agent according to claim 1, characterized in that: The sum of the mass percentages of Na2O and K2O is 11.31% to 13.56%.

3. A molten vanadium-containing steel slag conditioning and modifying agent, characterized in that: Based on parts by weight, for 100 parts by weight of molten vanadium-containing steel slag, the raw materials of the quenching and tempering modifier are: 3.4 to 3.9 parts of component A, wherein component A is Si powder; 3.0 to 3.8 parts of component B, wherein component B is CaF2 and NaCl, wherein the mass percentage of CaF2 is 86.9% and the mass percentage of NaCl is 13.1%; The component C comprises 36.5 to 58.4 parts of quicklime, Na2O and K2O; wherein the component C contains 3.56% to 6.88% by mass of Na2O and 6.03% to 7.87% by mass of K2O.

4. A molten vanadium-containing steel slag conditioning and modifying agent, characterized in that: Based on parts by weight, for 100 parts by weight of molten vanadium-containing steel slag, the raw materials of the quenching and tempering modifier are: 3.4 to 3.9 parts of component A, wherein component A is Si powder; 3.0 to 3.8 parts of component B, wherein, by mass parts, 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; The component C comprises 36.5 to 58.4 parts of quicklime, Na2O and K2O; wherein the component C contains 3.56% to 6.88% by mass of Na2O and 6.03% to 7.87% by mass of K2O.

5. The molten vanadium-containing steel slag conditioning and modifying agent according to claim 4, characterized in that: Component B consists of fluorite with a water content of less than 1%.

6. A molten vanadium-containing steel slag conditioning and modifying agent, characterized in that: Based on parts by weight, for 100 parts by weight of molten vanadium-containing steel slag, the raw materials of the quenching and tempering modifier are: 3.4 to 3.9 parts of component A, wherein component A is Si powder; 3.0 to 3.8 parts of component B, wherein, by mass parts, 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; The component C comprises 36.5 to 58.4 parts, wherein the component C consists of 73.88% quicklime, 4.16% Na2O, 5.55% K2O and 16.41% glass fragments, wherein the main components of the glass fragments are: 73.93% SiO2, 4.13% Al2O3, 10.02% CaO, 4.13% Na2O and 7.18% K2O.

Images