A method and device for grading and digesting f-CaO in steel slag based on regional division

Abstract

The present application belongs to the technical field of steel slag digestion, and specifically discloses a steel slag f-CaO graded digestion method and device based on region division. The method comprises the following steps: obtaining the f-CaO content and C / S of a plurality of kinds of steel slag, generating an f-CaO content and C / S distribution map; obtaining an f-CaO content standard value, and drawing an f-CaO content standard line; dividing the f-CaO content and C / S distribution map into a source conditioning area, a heat sweating strengthening area, a content standard area and an ideal composition area according to the f-CaO content and C / S distribution map and the f-CaO content standard line; performing conditioning treatment on the source conditioning area to adjust the steel slag C / S to the heat sweating strengthening area or the content standard area; and performing f-CaO digestion treatment on the steel slag in the heat sweating strengthening area to adjust the f-CaO content of the steel slag to the content standard area. The present application improves the digestion efficiency and quality by analyzing the f-CaO content and C / S in the steel slag, dividing the regions according to the data point distribution characteristics, and proposing different steel slag treatment methods for different regions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of steel slag digestion, and particularly relates to a steel slag f-CaO graded digestion method and device based on regional division. BACKGROUND

[0002] Steel slag is a solid waste produced in the steelmaking process. The production of steel slag is huge in the steel production process. Most steel enterprises magnetically select steel slag, and after sorting, the slag steel and magnetic selection powder are sold again. Most of the remaining tailings are discarded, causing environmental pollution, land occupation and resource waste. As a carrier resource, the recycling of steel slag can effectively solve the problems of excessive land occupation, primary resource consumption and carbon emission. At present, the utilization rate of steel slag is still less than 30%, therefore, in order to develop the circular economy of steel enterprises, developing and applying more advanced steel slag treatment processes and improving the utilization rate of steel slag are important topics for realizing sustainable development. The f-CaO content in steel slag is high, and volume expansion occurs in the hydration process, resulting in product cracking. Therefore, compared with conventional building material raw materials such as cement and fly ash, the stability of steel slag is poor, and there is a risk of cracking in the utilization process, resulting in low market acceptance. At the same time, the generation temperature of steel slag is between 1450-1650℃, and the specific heat capacity is 1.2kJ / (kg·℃), but the heat of high-temperature steel slag produced by converter steelmaking is difficult to store. At present, most steel plants use open-air slag splashing and water cooling to cool or naturally cool the steel slag. After the temperature of the steel slag is reduced to 80-100℃, it is transported to the steel slag field for storage. Shallow disc heat splashing method, smothering method, granulation wheel water quenching method, roller method and air quenching method are also used for steel slag treatment. The most advanced is the roller crushing-remaining heat pressure heat smothering process.

[0003] Traditional steel slag treatment basically uses natural stacking, water cooling, air cooling or a combination of the two to cool the steel slag during the cooling process. The f-CaO in the steel slag is digested at the same time of cooling, which is the currently widely used treatment process. However, the above methods waste a large amount of sensible heat of high-temperature steel slag. The heat recovery efficiency of the most advanced roller crushing-remaining heat pressure heat smothering process is relatively low, resulting in a large loss of high-grade sensible heat of steel slag, and the digestion effect of f-CaO in steel slag is not ideal. The above methods all belong to post-treatment methods of steel slag, which can only partially improve the performance of steel slag, and the mineral composition of steel slag is not significantly affected, so it cannot fundamentally digest the f-CaO in steel slag and further improve the performance of steel slag. The uncertainty of f-CaO content still restricts the problem of steel slag resource utilization, which seriously affects the application of steel slag in the downstream link. SUMMARY

[0004] The application aims to provide a steel slag f-CaO graded digestion method and device based on regional division, so as to solve the technical problem of low digestion efficiency caused by unstable f-CaO digestion in the existing steel slag f-CaO digestion process.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] In a first aspect, a steel slag f-CaO graded digestion method based on regional division comprises the following steps:

[0007] Obtaining f-CaO content and C / S of a plurality of steel slags;

[0008] Generating an f-CaO content and C / S distribution map according to the f-CaO content and C / S of each steel slag;

[0009] Obtaining an f-CaO content standard value, and demarcating an f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value;

[0010] Dividing the f-CaO content and C / S distribution map into four regions of a source conditioning area, a heat sweating strengthening area, a content standard area and an ideal composition area according to the f-CaO content and C / S distribution map and the f-CaO content standard line;

[0011] Conditioning the steel slag in the source conditioning area to adjust the C / S of the steel slag to the heat sweating strengthening area or the content standard area;

[0012] Performing f-CaO digestion treatment on the steel slag in the heat sweating strengthening area to adjust the f-CaO content of the steel slag to the content standard area.

[0013] Further improvement of the application is that the f-CaO content and C / S distribution map takes f-CaO content as the vertical coordinate and C / S as the horizontal coordinate, and each point represents a steel slag.

[0014] Further improvement of the application is that the f-CaO content standard value is f-CaO≤4%.

[0015] Further improvement of the application is that in the step of dividing the f-CaO content and C / S distribution map into four regions of a source conditioning area, a heat sweating strengthening area, a content standard area and an ideal composition area according to the f-CaO content and C / S distribution map and the f-CaO content standard line, the step specifically comprises:

[0016] The region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is less than or equal to the f-CaO content standard value is regarded as the ideal composition area;

[0017] The maximum C / S in the ideal composition region is taken as a first C / S standard value;

[0018] The source head conditioning region is taken as a region where the f-CaO content corresponding to all C / S in the C / S distribution map is greater than the f-CaO content standard value;

[0019] The minimum C / S in the source head conditioning region is taken as a second C / S standard value;

[0020] The content standard region is taken as a region where C / S is in [the first C / S standard value, the second C / S standard value], and the f-CaO content is less than or equal to the f-CaO content standard value f-CaO content standard value;

[0021] The hot sweating strengthening region is taken as a region where C / S is in [the first C / S standard value, the second C / S standard value], and the f-CaO content is greater than the f-CaO content standard value.

[0022] Further improvement of the application is that in the step of adjusting the C / S of the steel slag in the source head conditioning region to the hot sweating strengthening region or the content standard region, specifically comprising:

[0023] The conditioning agent is added to the steel slag at the first preset temperature for conditioning treatment.

[0024] Further improvement of the application is that the conditioning agent is fly ash, blast furnace slag or waste glass.

[0025] Further improvement of the application is that in the step of adding the conditioning agent to the steel slag at the first preset temperature for conditioning treatment, the mass calculation formula of the conditioning agent is as follows:

[0026]

[0027] a-C / S target value; x- required modifier mass / t; Aw(CaO)- mass percentage of CaO in the added modifier / %; Aw(SiO2)- mass percentage of SiO2 in the added modifier / %; Sw(CaO)- mass percentage of CaO in the steel slag / %; Sw(SiO2)- mass percentage of SiO2 in the steel slag / %; M(CaO)- molar mass of CaO / (g / mol); M(SiO2)- molar mass of SiO2 / (g / mol); 17- steel slag mass per pot / t.

[0028] Further improvement of the application is that in the step of adjusting the f-CaO content of the steel slag in the hot sweating strengthening region to the content standard region, the digestion treatment includes roll crushing cooling strengthening and hot sweating process strengthening, and the roll crushing cooling strengthening is to enhance the roll crushing intensity while passing in cooling medium;

[0029] The heat leaching process is strengthened by increasing the temperature and pressure of the steel slag heat leaching process, and introducing steel plant flue gas or enriched CO2 gas and water vapor.

[0030] The further improvement of the present application is that the steel slag is the steel slag treated by the roller crushing-waste heat pressure heat leaching process.

[0031] In the second aspect, a steel slag f-CaO grading digestion device based on regional division comprises:

[0032] The data acquisition module is used for acquiring the f-CaO content and C / S of a plurality of kinds of steel slag.

[0033] The f-CaO content and C / S distribution map generation module is used for generating an f-CaO content and C / S distribution map according to the f-CaO content and C / S of each kind of steel slag.

[0034] The f-CaO content standard line setting module is used for acquiring an f-CaO content standard value, and setting an f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value.

[0035] The regional division module is used for dividing the f-CaO content and C / S distribution map into a source conditioning area, a heat leaching strengthening area, a content standard area and an ideal composition area according to the f-CaO content and C / S distribution map and the f-CaO content standard line setting.

[0036] The source conditioning area digestion module is used for conditioning treatment on the source conditioning area, and adjusting the C / S of the steel slag to the heat leaching strengthening area or the content standard area.

[0037] The heat leaching strengthening area digestion module is used for f-CaO digestion treatment on the steel slag in the heat leaching strengthening area, and adjusting the f-CaO content of the steel slag to the content standard area.

[0038] Compared with the prior art, the present application has at least the following beneficial effects:

[0039] 1. The present application analyzes the f-CaO content and C / S in the steel slag, divides regions according to the data point distribution characteristics, proposes different steel slag treatment methods for different regions, and improves the digestion efficiency and digestion effect.

[0040] 2. The present application provides corresponding treatment methods for steel slag in different regions, and has pertinence and comprehensiveness.

[0041] 3. The present application performs conditioning treatment on the steel slag in the source conditioning area, adds a conditioning agent, adjusts the composition of the steel slag from the source by using the waste heat of the steel slag, reduces the f-CaO content in the steel slag, improves the performance of the steel slag, and the method is energy-saving and environmentally friendly.

[0042] 4. This invention achieves permanent carbon sequestration by utilizing steel plant flue gas or enriched CO2 gas to digest f-CaO in steel slag. Attached Figure Description

[0043] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0044] In the attached diagram:

[0045] Figure 1 This is a flowchart of a method for graded digestion of f-CaO in steel slag based on region division according to the present invention;

[0046] Figure 2 This is a diagram showing the f-CaO content and C / S distribution in a region-based graded digestion method for steel slag according to the present invention.

[0047] Figure 3 This is a region division diagram of the f-CaO staged digestion method in steel slag based on region division according to the present invention.

[0048] Figure 4 This is a bar chart showing the average mass of three conditioning agents required to adjust the steel slag in the region with C / S > 4.625 to C / S = 3.250 and 4.625 respectively in a region-based f-CaO graded digestion method for steel slag according to the present invention.

[0049] Figure 5 This is a graph showing the f-CaO content versus C / S curve in a region-based graded digestion method for f-CaO in steel slag according to the present invention.

[0050] Figure 6 This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 10% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0051] Figure 7 This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 9% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0052] Figure 8 This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 8% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0053] Figure 9This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 7% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0054] Figure 10 This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 6% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0055] Figure 11 This is a line graph showing the mass of three conditioning agents required to reduce the f-CaO content from 5% to various target values ​​in a region-based graded digestion method for steel slag according to the present invention.

[0056] Figure 12 This is a structural block diagram of a region-division-based f-CaO staged digestion device for steel slag according to the present invention.

[0057] In the diagram: 1-Source conditioning zone; 2-Heat-enhanced zone; 3-Content-compliant zone; 4-Ideal composition zone. Detailed Implementation

[0058] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0059] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0060] Example 1

[0061] A method for the graded digestion of f-CaO in steel slag based on region division, such as... Figure 1 As shown, it includes the following steps:

[0062] S1. Obtain the f-CaO content and C / S ratio of several types of steel slag;

[0063] Specifically, in this article, C / S represents the molar ratio of CaO to SiO2 in steel slag;

[0064] Specifically, several types of steel slag are steel slag processed by roller crushing-residual heat pressurized hot quenching process. The steel slag in this stage has undergone roller crushing and residual heat pressurized hot quenching treatment, which is representative. In fact, the digestion strategy in this embodiment can be implemented on steel slag in any of the processing stages.

[0065] S2, according to the f-CaO content of each steel slag and the C / S distribution map of the f-CaO content and C / S;

[0066] Specifically, the f-CaO content and C / S distribution map is as shown in the figure, taking the f-CaO content as the ordinate and taking C / S as the abscissa, and each point represents a steel slag; Figure 2

[0067] S3, obtaining a f-CaO content standard value, and drawing a f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value;

[0068] Specifically, the f-CaO content standard value is f-CaO≤4% in the national standard GB / T 20491-2017 "Steel Slag Powder for Cement and Concrete", and the f-CaO content standard line represents that the f-CaO content is 4%;

[0069] S4, according to the f-CaO content and C / S distribution map and the f-CaO content standard line, the f-CaO content and C / S distribution map is divided into four regions of source conditioning area, heat soaking strengthening area, content standard area and ideal composition area;

[0070] Specifically, in S4, the following steps are specifically included:

[0071] S41, the region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is less than or equal to 4% is taken as the ideal composition area, as shown in region 4 in Figure 3

[0072] S42, the maximum C / S in the ideal composition area is taken as the first C / S standard value;

[0073] S43, the region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is greater than 4% is taken as the source conditioning area, as shown in region 1 in Figure 3

[0074] S44, the minimum C / S in the source conditioning area is taken as the second C / S standard value;

[0075] S45, the region in which C / S∈[the first C / S standard value, the second C / S standard value] and the f-CaO content is less than or equal to 4% is taken as the content standard area, as shown in region 3 in Figure 3

[0076] The region in which C / S∈[the first C / S standard value, the second C / S standard value] and the f-CaO content is greater than 4% is taken as the heat soaking strengthening area, as shown in region 2 in Figure 3

[0077] ​​​​​Specifically, when the C / S in the steel slag is greater than the second C / S standard value, the f-CaO content of the steel slag is greater than 4%, the steel slag data point is distributed in the source conditioning area, and the steel slag with C / S greater than the second C / S standard value is difficult to digest f-CaO in the steel slag to less than or equal to 4% after converter slagging through the existing roller crushing-waste heat pressure heat sweating steel slag treatment process of a certain steel plant, so it is necessary to regulate and control the composition of the steel slag from the source to carry out conditioning treatment of the steel slag;

[0078] S5, conditioning treatment is performed on the steel slag in the source conditioning area until the steel slag enters the heat sweating strengthening area or the content reaches the standard area;

[0079] Specifically, in S5, a conditioning agent is added to the steel slag at the first preset temperature for conditioning treatment;

[0080] Specifically, the conditioning agent is a silicon-rich substance, rich in SiO2, such as fly ash, blast furnace slag or waste glass;

[0081] Specifically, the first preset temperature is 1450-1650°C, and the first preset temperature is the temperature when the converter discharges the steel slag;

[0082] Specifically, during conditioning treatment, the mass of the conditioning agent is calculated according to the following formula:

[0083]

[0084] a-C / S target value; x- required modifier mass / t; Aw(CaO)- mass percentage of CaO in the added modifier / %; Aw(SiO2)- mass percentage of SiO2 in the added modifier / %; Sw(CaO)- mass percentage of CaO in the steel slag / %; Sw(SiO2)- mass percentage of SiO2 in the steel slag / %; M(CaO)- molar mass of CaO / (g / mol); M(SiO2)- molar mass of SiO2 / (g / mol); 17- steel slag mass per tank / t.

[0085] C / S target value∈[first C / S standard value, second C / S standard value].

[0086] S6, f-CaO digestion treatment is performed on the steel slag in the heat sweating strengthening area to adjust the f-CaO content of the steel slag to the content standard area.

[0087] Specifically, the digestion treatment in S6 includes:

[0088] The combination of the roller crushing and cooling strengthening and the thermal leaching process strengthening processes the steel slag in the thermal leaching strengthening zone to the content standard zone. The main measure of the roller crushing and cooling strengthening is to enhance the roller pressure to reduce the particle size of the steel slag as much as possible, and to introduce a suitable cooling medium to increase the cooling rate of the high-temperature steel slag and reduce the amount of f-CaO generated in the cooling process of the steel slag; the main measure of the thermal leaching process strengthening is to increase the temperature and pressure of the steel slag in the thermal leaching process to accelerate the f-CaO digestion rate of the steel slag in the thermal leaching process, and to introduce the flue gas or enriched CO2 gas of the steel plant to participate in the f-CaO digestion process with the water vapor in the thermal leaching process to enhance the f-CaO digestion effect of the steel slag, and the steel slag in the content standard zone does not need to be subjected to a special treatment process. Figure 3 The f-CaO of the steel slag in the ideal composition zone meets the requirements and does not need to be subjected to a special treatment process.

[0089] Example 2

[0090] A steel slag f-CaO graded digestion device based on region division, based on the steel slag f-CaO graded digestion method based on region division in Example 1, as shown in Figure 12 , comprises:

[0091] A data acquisition module is configured to acquire the f-CaO content and C / S of a plurality of kinds of steel slag.

[0092] An f-CaO content and C / S distribution map generation module is configured to generate an f-CaO content and C / S distribution map according to the f-CaO content and C / S of each kind of steel slag.

[0093] An f-CaO content standard line setting module is configured to acquire an f-CaO content standard value, and to set an f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value.

[0094] A region division module is configured to divide the f-CaO content and C / S distribution map into a source conditioning zone, a thermal leaching strengthening zone, a content standard zone, and an ideal composition zone according to the f-CaO content and C / S distribution map and the f-CaO content standard line setting.

[0095] A source conditioning zone digestion module is configured to perform conditioning treatment on the source conditioning zone to adjust the C / S of the steel slag to the thermal leaching strengthening zone or the content standard zone.

[0096] A thermal leaching strengthening zone digestion module is configured to perform f-CaO digestion treatment on the steel slag in the thermal leaching strengthening zone to adjust the f-CaO content of the steel slag to the content standard zone.

[0097] Example 3

[0098] A method for calculating the mass of a conditioning agent in a method for graded digestion of f-CaO in steel slag based on regional division, based on the method for graded digestion of f-CaO in steel slag based on regional division in Embodiment 1:

[0099] Specifically, the chemical composition and content of the steel slag are shown in Table 1.

[0100] Table 1 Chemical composition and content of steel slag

[0101]

[0102] Specifically, when the steel slag in the source conditioning area is subjected to conditioning treatment, the chemical composition and content of the added conditioning agent are shown in Table 2.

[0103] Table 2 Chemical composition and content of conditioning agent

[0104]

[0105]

[0106] Specifically, the first C / S standard value is 3.250, and the second C / S standard value is 4.625. In the step of conditioning treatment by adding a conditioning agent to the steel slag at the first preset temperature, the mass of the conditioning agent is calculated as follows.

[0107] The C / S of the steel slag in the source conditioning area is adjusted to the first C / S standard value of 3.250 and the second C / S standard value of 4.625, respectively, and then the mass of the conditioning agent is calculated according to the formula.

[0108]

[0109] The mass of the conditioning agent required for adjusting different steel slags to the first C / S standard value using different conditioning agents is averaged.

[0110] The mass of the conditioning agent required for adjusting different steel slags to the second C / S standard value using different conditioning agents is averaged, and the results are shown in Table 3. Figure 4

[0111] According to the formula Figure 4 The average range is provided for the addition amount of the conditioning agent, which has sufficient applicability for the conditioning treatment process of the steel slag in the source conditioning area.

[0112] Embodiment 4

[0113] A method for calculating the mass of a conditioning agent in a method for graded digestion of f-CaO in steel slag based on regional division, based on the method for graded digestion of f-CaO in steel slag based on regional division in Embodiment 1, comprising the following steps:

[0114] ​A1, according to the f-CaO content and C / S distribution diagram fitting f-CaO content and C / S curve, and according to the f-CaO content and C / S curve f-CaO content and C / S corresponding relationship in steel slag, as shown in Figure 5 ; Figure 5 The midpoint value is shown in Table 3.

[0115] Specifically, because the composition of steel slag is complex and affected by many factors, the relationship between f-CaO content and C / S ratio in steel slag is not clear, therefore, the average value method is used to average the f-CaO content close to the same C / S value, which reduces the influence degree of each factor to a certain extent, and the f-CaO content and C / S curve in steel slag is obtained.

[0116] Table 3 f-CaO content and C / S corresponding relationship in steel slag obtained according to the fitting curve

[0117]

[0118] A2, according to the f-CaO content and C / S corresponding relationship in steel slag, the mass of three kinds of conditioning agents required to reduce the f-CaO content corresponding to different C / S to the required value is calculated, and the calculation result is shown in Figures 6-11 , Figures 6-11 The mass of the corresponding conditioning agent required to adjust to the process strengthening area or content standard area is in the middle frame, and this method is more targeted.

[0119] From the technical knowledge, the present application can be realized by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments, in all aspects, are only illustrative and not the only. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

[0120] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can be modified or replaced, without departing from the spirit and scope of the present application, any modification or equivalent replacement, which should be covered in the protection scope of the claims of the present application.

Claims

1. A method for grading digestion of f-CaO in steel slag based on regional division, characterized in that, The method comprises the following steps: obtaining the f-CaO content and C / S of a plurality of steel slags; wherein C / S represents the molar ratio of CaO to SiO2 in the steel slag; generating an f-CaO content and C / S distribution map according to the f-CaO content and C / S of each steel slag, with the f-CaO content as the vertical coordinate and the C / S as the horizontal coordinate, and each point representing a steel slag; obtaining an f-CaO content standard value and marking an f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value; the f-CaO content standard value is a mass fraction of f-CaO ≤ 4%; dividing the f-CaO content and C / S distribution map into four regions, namely a source conditioning region, a heat sweating strengthening region, a content standard region, and an ideal composition region, according to the f-CaO content and C / S distribution map and the f-CaO content standard line, specifically as follows: regarding the region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is less than or equal to the f-CaO content standard value as the ideal composition region; regarding the maximum C / S in the ideal composition region as a first C / S standard value; regarding the region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is greater than the f-CaO content standard value as the source conditioning region; regarding the minimum C / S in the source conditioning region as a second C / S standard value; regarding the region in which C / S ∈ (the first C / S standard value, the second C / S standard value) and the f-CaO content is less than or equal to the f-CaO content standard value as the content standard region; regarding the region in which C / S ∈ (the first C / S standard value, the second C / S standard value) and the f-CaO content is greater than the f-CaO content standard value as the heat sweating strengthening region; performing conditioning treatment on the steel slag in the source conditioning region to adjust the C / S of the steel slag to the heat sweating strengthening region or the content standard region; performing f-CaO digestion treatment on the steel slag in the heat sweating strengthening region to adjust the f-CaO content of the steel slag to the content standard region.

2. The method according to claim 1, wherein, In the step of performing conditioning treatment on the steel slag in the source conditioning region to adjust the C / S of the steel slag to the heat sweating strengthening region or the content standard region, specifically comprising: adding a conditioning agent to the steel slag at a first preset temperature to perform conditioning treatment.

3. The method according to claim 2, wherein the method is characterized by, The conditioning agent is fly ash, blast furnace slag, or waste glass.

4. The method according to claim 2, wherein the method is characterized by, In the step of adding a conditioning agent to the steel slag at a first preset temperature to perform conditioning treatment, the mass calculation formula of the conditioning agent is as follows: C / S = 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 5. The method according to claim 1, wherein the method is characterized by, In the step of performing f-CaO digestion treatment on the steel slag in the heat sweating strengthening region to adjust the f-CaO content of the steel slag to the content standard region, the digestion treatment includes roller crushing and cooling strengthening and heat sweating process strengthening, the roller crushing and cooling strengthening is to enhance the roller crushing intensity while introducing a cooling medium; the heat sweating process strengthening is to improve the temperature and pressure of the steel slag in the heat sweating process while introducing steel plant flue gas or enriched CO2 gas and water vapor.

6. The method according to claim 1, wherein the method is characterized by, The steel slag is a steel slag treated by a roller crushing and residual heat pressure heat sweating process.

7. A device for grading digestion of f-CaO in steel slag based on regional division, characterized in that, comprise: a data acquisition module for obtaining the f-CaO content and C / S of a plurality of steel slags; wherein C / S represents the molar ratio of CaO to SiO2 in the steel slag; The f-CaO content and C / S distribution map generation module is configured to generate an f-CaO content and C / S distribution map according to the f-CaO content and C / S of each steel slag, with the f-CaO content as the vertical coordinate, the C / S as the horizontal coordinate, and each point representing a steel slag; The f-CaO content standard line setting module is configured to obtain an f-CaO content standard value, and set an f-CaO content standard line in the f-CaO content and C / S distribution map according to the f-CaO content standard value; The region division module is configured to divide the f-CaO content and C / S distribution map into four regions, i.e., a source conditioning region, a heat sweating strengthening region, a content standard region, and an ideal composition region, according to the f-CaO content and C / S distribution map and the f-CaO content standard line, specifically as follows: The region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is less than or equal to the f-CaO content standard value is regarded as the ideal composition region; The maximum C / S in the ideal composition region is regarded as a first C / S standard value; The region in which the f-CaO content corresponding to all C / S in the f-CaO content and C / S distribution map is greater than the f-CaO content standard value is regarded as the source conditioning region; The minimum C / S in the source conditioning region is regarded as a second C / S standard value; The region in which C / S is in the range of (the first C / S standard value, the second C / S standard value) and the f-CaO content is less than or equal to the f-CaO content standard value is regarded as the content standard region; The region in which C / S is in the range of (the first C / S standard value, the second C / S standard value) and the f-CaO content is greater than the f-CaO content standard value is regarded as the heat sweating strengthening region; The source conditioning region digestion module is configured to perform conditioning treatment on the steel slag in the source conditioning region, so as to adjust the C / S of the steel slag to the heat sweating strengthening region or the content standard region; The heat sweating strengthening region digestion module is configured to perform f-CaO digestion treatment on the steel slag in the heat sweating strengthening region, so as to adjust the f-CaO content of the steel slag to the content standard region.

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