Cementing material taking lime kiln waste residue-steel slag-mineral slag as raw materials and preparation method thereof

Abstract

The invention relates to a cementing material with lime kiln waste residue-steel slag-mineral slag as raw materials and a preparation method, and belongs to the technical field of building material preparation. The cementing material comprises the following raw materials in parts by weight: 4-10 parts of lime kiln waste residue, 40-50 parts of steel slag and 45-60 parts of mineral slag. In a gelling system, the steel slag provides OH <-> and divalent metal ions, the slag provides Ca < 2 + > and Al < 3 + >, the lime kiln waste residue provides Ca < 2 + >, Al < 3 + >, OH <->, silicate, aluminate and the like, silicon (aluminum) oxygen tetrahedrons in the three raw materials are subjected to depolymerization reconstruction and re-polymerization to form new hydration products AFt and C-S-H gel, and the products provide strength for the gelling material. Through reasonable matching of the lime kiln waste residues, the steel slag and the mineral slag, rapid increase of early-stage strength is guaranteed, and continuous enhancement of later-stage strength is also guaranteed. And the cementing material is prepared by comprehensively utilizing the metallurgical solid waste residues on the basis of not adding chemical reagents.

Description

Technical Field

[0001] This application relates to the technical field of building material preparation, and particularly relates to a cementitious material made from lime kiln waste slag - steel slag - slag and a preparation method thereof. Background Art

[0002] Lime kiln waste slag is the industrial waste discharged from lime kilns during lime production. Since lime kilns use a simple process of stacking limestone and coal in layers for roasting in the kiln, the yield is not high, and unburned limestone, coal slag, and unselected quicklime are discarded as industrial waste. In limestone areas, there are many lime factories, and the lime waste slag discharged every year occupies cultivated land, pollutes the environment, and causes public hazards. Many solid waste metallurgical slags are generated during the metal smelting process, such as slag, steel slag, etc. In particular, steel slag is a type of industrial waste that is difficult to utilize among metallurgical slags due to poor soundness and grindability. Currently, the main utilization methods include iron separation from steel slag and preparation of steel slag fine powder. However, due to the above reasons, the market still has a conservative attitude towards its comprehensive utilization products. Therefore, effectively utilizing waste slags such as lime kiln waste slag, steel slag, and slag, turning waste into treasure, and how to develop new materials from industrial waste slags and fully and effectively recycle lime kiln waste slag, steel slag, etc. have become an urgent task at this stage.

[0003] Some of the cementitious materials under the existing raw material technical ratio add chemical reagents, increasing the cost or the risk of environmental pollution; some can only utilize one or several of the solid waste slags such as lime kiln waste slag, steel slag, and slag, and the utilization of solid waste is not comprehensive enough; some, like steel slag, have a low utilization rate and a small admixture amount, which cannot play the role of consuming steel slag. It is necessary to optimize the raw material ratio and other aspects of the cementitious material prepared from waste slags such as lime kiln waste slag and steel slag to achieve full and effective recycling and reduce costs. Summary of the Invention

[0004] This application provides a cementitious material made from lime kiln waste slag - steel slag - slag and a preparation method thereof to solve the following technical problems: how to comprehensively utilize solid waste slags to prepare cementitious materials without adding chemical reagents.

[0005] In the first aspect, an embodiment of this application provides a cementitious material made from lime kiln waste slag - steel slag - slag. In parts by weight, the raw materials of the cementitious material include: 4 to 10 parts of lime kiln waste slag, 40 to 50 parts of steel slag, and 45 to 60 parts of slag.

[0006] Optionally, the specific surface area of the cementitious material > 500m 2 / kg.

[0007] Optionally, the lime kiln waste slag, the steel slag, and the slag are all in dry basis.

[0008] Optionally, based on the mass fraction, the moisture content of the dry basis is ≤0.1%.

[0009] Optionally, the components of the lime kiln waste residue include: CaO, CaCO3, and Ca(OH)2.

[0010] Optionally, the steel slag is one or more of converter slag, open-hearth slag, and electric furnace slag.

[0011] Optionally, the components of the steel slag include: FeO, Fe2O3, CaO, MgO, and SiO2.

[0012] Optionally, the components of the slag include: silicate and aluminosilicate.

[0013] Optionally, the compressive strength of the cementitious material under standard curing conditions for 28 days is >30 MPa.

[0014] In a second aspect, an embodiment of the present application provides a method for preparing the cementitious material described in the first aspect, characterized in that the method includes:

[0015] Mix the lime kiln waste residue, the steel slag, and the slag according to the parts by weight to obtain a mixture;

[0016] Grind the mixture to obtain a gel material.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The present application provides a cementitious material using lime kiln waste residue - steel slag - slag as raw materials. By weight, the raw materials of the cementitious material include: 4 to 10 parts of lime kiln waste residue, 40 to 50 parts of steel slag, and 45 to 60 parts of slag. In the cementitious system, the steel slag provides OH ﹣ and divalent metal ions, the slag provides Ca 2+ and Al 3+ , and the lime kiln waste residue provides Ca 2+ , Al 3+ , OH ﹣ , silicate, aluminosilicate, etc. The silicon (aluminum) oxygen tetrahedrons in the three raw materials are depolymerized and reconstructed, and then re-polymerized into new hydration products AFt and C-S-H gels, which provide strength for the cementitious material. Through the reasonable combination of lime kiln waste residue, steel slag, and slag, it not only ensures the rapid growth of early strength but also ensures the continuous enhancement of later strength. On the basis of not adding chemical reagents, it realizes the comprehensive utilization of metallurgical solid waste residues to prepare cementitious materials. Description of the Drawings

[0019] The accompanying drawings here are incorporated into and form a part of this specification, showing embodiments consistent with this application and, together with the specification, are used to explain the principles of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or in the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic flow chart of a preparation method of a cementitious material using lime kiln waste residue - steel slag - slag as raw materials provided for the embodiments of this application. Specific embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts fall within the scope of protection of this application.

[0023] The various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be construed as a rigid limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values within that range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within that range, such as 1, 2, 3, 4, 5, and 6, and this applies regardless of the range; in addition, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0024] In this text, terms such as "including" mean "including but not limited to". Relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. "And / or", which describes the relationship between associated objects, indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, or B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "multiple" means two or more; "at least one kind", "at least one of the following items (pieces)" or similar expressions refer to any combination of these items, including any combination of single items (pieces) or plural items (pieces); for example, "at least one of a, b, or c", or "at least one of a, b, and c" can both represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple respectively. "Parts representation method" such as parts by weight, parts by mass, etc. represents the proportional relationship between each component. In the proportional relationships involved in this text, the parameters that need to be described by proportion should be understood as the antecedents of the proportion formula in the order of description, and the proportional numbers should be understood as the consequents of the proportion formula. For example, if the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one by one with the proportional numbers in the proportion formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0025] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in this text can be obtained through market purchases or can be prepared by existing methods.

[0026] In a first aspect, an embodiment of the present application provides a cementitious material using lime kiln waste residue - steel slag - slag as raw materials. By weight, the raw materials of the cementitious material include: 4 to 10 parts of lime kiln waste residue, 40 to 50 parts of steel slag, and 45 to 60 parts of slag.

[0027] The lime kiln waste residue is rich in calcium oxide (CaO), which can provide Ca 2+ ions and react with water to generate OH-. In addition, it also contains impurities such as silicates and aluminates. These silicoaluminates have high hardness and corrosion resistance, and can enhance the strength and durability of the material. The steel slag provides metal cations and OH-, as well as dicalcium silicate and tricalcium silicate within a certain quantitative range. The weight parts of the steel slag need to be moderate. Excessive amounts will reduce the early activity and lead to slow strength growth; too low amounts will affect the later strength growth. The slag serves as the hydration basis and provides a large amount of Ca 2+ and Al 3+Ions. The weight portion of the slag needs to be controlled as well. If it is too high, it may lead to unqualified late strength. If it is too low, the early strength growth will be slow.

[0028] In the embodiments of the present application, the steel slag in the cementitious system provides OH ﹣ and divalent metal ions, and the slag provides Ca 2+ and Al 3+ , the lime kiln waste residue provides Ca 2+ , Al 3+ , OH ﹣ , silicate, aluminate, etc. The depolymerization and reconstruction of the silicon (aluminum) oxygen tetrahedron in the three raw materials are re-polymerized into new hydration products AFt and C-S-H gels to provide strength. In the embodiments of the present application, for the first time, a cementitious material is prepared by using three materials, namely lime kiln waste residue, steel slag and slag. Using industrial metallurgical waste residues such as solid waste lime kiln waste residue and slag with potential hydration activity as the main raw materials, only grinding and drying are required, without chemical reagents and high-temperature calcination. It has the advantages of simple production process, wide material sources and low prices, etc., reducing the cost. And it reduces the risk of environmental pollution caused by adding chemical reagents. Due to the characteristics of the lime kiln waste residue, adding the lime kiln waste residue can improve its initial setting time and early strength; due to the characteristics of the steel slag, adding a large amount of steel slag can continuously provide strength growth in the later stage, and more fully and effectively recycle the solid waste residues.

[0029] In some embodiments, the specific surface area of the cementitious material > 500 m 2 / kg.

[0030] The specific surface area refers to the surface area possessed by a unit mass of material and is an index to measure the fineness of particles.

[0031] The high specific surface area cementitious material has the following characteristics:

[0032] Fine particles: The cementitious material with a high specific surface area usually has fine particles, which enables it to react with water faster during the hydration process, thereby increasing the reaction rate.

[0033] Fast hydration rate: Due to the fine particles, the contact area between the cementitious material and water increases, and the hydration reaction rate is correspondingly accelerated.

[0034] Fast strength development: A fast hydration rate means that the cementitious material can form more hydration products in the early stage, thus accelerating the strength development.

[0035] Large water demand: Due to its fine particles, the cementitious material with a high specific surface area requires more water to fully wet and disperse the particles, so its water demand is relatively large.

[0036] In the embodiments of the present application, the specific surface area of the cementitious material > 500 m 2 / kg, the particles are fine, the contact area with water increases, the hydration reaction rate is fast, the early strength is high, which is beneficial to improving the performance of the material. Exemplarily, the specific surface area of the cementitious material can be 500 m 2 / kg, 510 m 2 / kg, 520 m 2 / kg, 530 m 2 / kg, 540 m 2 / kg, 550 m 2 / kg, etc.

[0037] In some embodiments, the compressive strength of the cementitious material under standard curing conditions for 28 days > 30 MPa.

[0038] Compressive strength refers to the ability of a material to resist damage when subjected to pressure. For cementitious materials, compressive strength is one of the key indicators of their performance. During the 28-day curing period, the hydration products in the cementitious material gradually form and solidify, thus forming a stable microstructure. During this process, the compressive strength gradually increases until it reaches a stable value. Cementitious materials with a compressive strength greater than 30 MPa have high mechanical properties and stability, and can be widely used in infrastructure fields such as buildings, roads, and bridges. These materials can not only replace traditional cementitious materials such as cement, but also achieve resource recycling and environmental sustainable development.

[0039] In some embodiments, the lime kiln waste residue, the steel slag, and the slag are all on a dry basis.

[0040] In some embodiments, by mass fraction, the moisture content of the dry basis ≤ 0.1%.

[0041] Dry basis is a relative concept, which refers to the state or benchmark of the material after removing moisture. Using the dry basis for calculation can avoid the influence of moisture in the raw materials on the measurement of the effective components and facilitate the conversion between various raw materials. However, in actual operation, it is difficult to completely remove the moisture in the material, so there may still be trace amounts of moisture in the dry basis. In the embodiments of the present application, there is an upper limit value for the moisture content in the dry basis, that is, it does not exceed 0.1% of the dry basis weight. Exemplarily, the moisture content of the dry basis can be 0.02%, 0.04%, 0.06%, 0.08%, 0.1%, etc.

[0042] In some embodiments, the components of the lime kiln waste residue include: CaO, CaCO3, and Ca(OH)2.

[0043] Lime kiln waste residue is mainly generated during the process of limestone being calcined at high temperature to decompose into lime and carbon dioxide. In this process, calcium carbonate (CaCO3) in limestone decomposes at high temperature to form calcium oxide (CaO) and carbon dioxide (CO2), and the remaining solid part forms lime kiln waste residue. The main component of lime kiln waste residue is calcium oxide (CaO), and in addition, it also contains a small amount of impurities such as magnesium oxide (MgO), silicon dioxide (SiO2), and aluminum oxide (Al2O3). Lime kiln waste residue usually has high alkalinity and hygroscopicity, and is prone to reacting with moisture in the air to form calcium hydroxide (Ca(OH)2) and release a large amount of heat. If not properly treated, lime kiln waste residue may cause pollution to the surrounding environment, such as dust pollution, water pollution, and soil pollution, etc.

[0044] The positive effects of limiting the weight portion of lime kiln waste residue to 4 parts to 10 parts: A large amount of calcium oxide is contained in lime kiln waste residue, providing Ca 2+ , and OH can also be provided after reacting with water ﹣ ; A small amount of slag is also contained in lime kiln waste residue, which can also provide Ca 2+ and Al 3+ ; Lime kiln waste residue also contains impurities such as silicates and aluminates. Aluminosilicate is an excellent filling material and is widely used in building materials. Aluminosilicate has high hardness and corrosion resistance, can enhance the strength of materials, and improve their compressive capacity and durability. The aluminum ions provided by it can also increase the reaction rate, and can control the initial setting time and slump loss of cementitious materials as well as the subsequent strength. Exemplarily, the weight portion of lime kiln waste residue can be 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0045] In some embodiments, the steel slag is one or more of converter slag, open hearth slag, and electric furnace slag.

[0046] Converter slag, open hearth slag, and electric furnace slag can all be used as one of the raw materials for preparing cementitious materials. Their mixed use can make full use of various steel slag resources and optimize the performance and cost of cementitious materials by adjusting the mixing ratio.

[0047] In some embodiments, the composition of the steel slag includes: FeO, Fe2O3, CaO, MgO, and SiO2.

[0048] The positive effects of limiting the weight portion of steel slag to 40 parts to 50 parts: Provide metal cations and OH within a quantitative range ﹣, and provide dicalcium silicate and tricalcium silicate. If the weight portion of the steel slag is higher than 50 parts, to a certain extent, the early activity of the prepared cementitious material will be low, so that the early strength growth is slow; if the weight portion of the steel slag is lower than 40 parts, to a certain extent, it will affect its later strength growth. Exemplarily, the weight portion of the steel slag can be 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, etc.

[0049] In some embodiments, the composition of the slag includes: silicate and aluminosilicate.

[0050] Slag is a solid waste generated in the processes of mining, ore dressing and processing and smelting, especially in the process of blast furnace ironmaking. After iron oxide is reduced to metallic iron at high temperature, the impurities in the iron ore react with added lime and other substances to form a melt, which after quenching forms a porous granular material with a loose texture, that is, blast furnace slag, simply referred to as slag. The chemical composition of slag mainly includes silicate and aluminosilicate.

[0051] Positive effects of limiting the weight portion of the slag to 45 parts to 60 parts: Taking the slag as the hydration base, a large amount of calcium ions and aluminum ions are provided. If the weight portion of the slag is higher than 60 parts, to a certain extent, the later strength of a cementitious material prepared with lime kiln waste residue, steel slag and slag will be unqualified; if the weight portion of the slag is lower than 45 parts, to a certain extent, it will lead to slow early strength growth. Exemplarily, specifically, the weight portion of the slag can be 45 parts, 48 parts, 51 parts, 54 parts, 57 parts, 60 parts, etc.

[0052] Figure 1 Schematic flow chart of a preparation method of a cementitious material using lime kiln waste residue - steel slag - slag as raw materials provided by an embodiment of the present application.

[0053] Please refer to Figure 1 , Second, an embodiment of the present application provides a preparation method of the cementitious material described in the first aspect, characterized in that the method includes:

[0054] S1. According to the weight portions, mix the lime kiln waste residue, the steel slag and the slag to obtain a mixture;

[0055] S2. Grind the mixture to obtain a gel material.

[0056] The lime kiln waste residue, steel slag and slag used in the embodiments of the present application are on a wet basis, but the measurement ratio is calculated according to the dry basis contained. This requires first measuring the moisture content of the wet basis during the production process, and then calculating the required wet basis mass based on the dry basis mass percentage. This approach can ensure the accuracy of the raw material ratio, thereby improving the stability of the product quality.

[0057] In the embodiments of the present application, the required wet basis mass is inversely calculated based on the dry basis mass in the mix ratio. After respectively weighing the corresponding masses of wet lime kiln waste residue, wet steel slag, and wet slag and drying them in an oven at 105°C, they are added to a mill for grinding. During the grinding process, the specific surface area of the mixed material is continuously detected to ensure that the specific surface area of the material is above 500 m 2 / kg, and finally a cementitious material prepared from lime kiln waste residue, steel slag, and slag is obtained.

[0058] Cementitious materials with a high specific surface area usually need to be prepared through a fine grinding process to ensure the fineness and uniformity of the particles.

[0059] The product prepared by the preparation method of this cementitious material is the above-mentioned cementitious material. Since the preparation method of this cementitious material adopts some or all of the technical solutions of the embodiments of the cementitious material, it at least has all the beneficial effects brought by the technical solutions of the embodiments of the cementitious material, which will not be elaborated one by one here.

[0060] The following further elaborates the present application in conjunction with specific embodiments. For the experimental methods without specific conditions indicated in the following embodiments, they are usually determined according to national standards / industry standards; if there are no corresponding national standards / industry standards, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0061] According to GB / T 17671-1999 "Test Method for Strength of Cement Mortar (ISO Method)", the strength of the cementitious material is evaluated by mortar specimens, so additional components are required: sand and solvent.

[0062] Specifically in the embodiments of the present application, the solvent is tap water, which is widely sourced and convenient for experiments. The sand is natural river sand with a particle size of 0.16 mm to 2.36 mm and a mud content of <0.5%.

[0063] A method for preparing mortar specimens of a cementitious material prepared from lime kiln waste residue, steel slag, and slag, a set of mortar specimens includes the following raw material components: 450 g of a cementitious material prepared from lime kiln waste residue, steel slag, and slag, 1350 g of sand, and 225 g of solvent;

[0064] A method for preparing mortar specimens of a cementitious material prepared from lime kiln waste residue, steel slag, and slag specifically includes the following steps:

[0065] (1) According to the dry basis mass in the mix ratio, the required wet basis mass is inversely calculated. After respectively weighing the corresponding masses of wet lime kiln waste residue, wet steel slag, and wet slag and drying them in an oven at 105°C, they are added to a mill for grinding;

[0066] (2) During the grinding process, the specific surface area of the mixed material is continuously detected to ensure that the specific surface area of the material is 500 m 2above / kg, and finally obtain a cementitious material prepared from lime kiln waste residue, steel slag and slag;

[0067] (3) Add 450 g of the cementitious material prepared from lime kiln waste residue, steel slag and slag and 225 ml of solvent into the mixing pot, and stir and mix at low speed for 30 s ± 1 s; then add 1350 g of sand into the mixing bucket, stir and mix at low speed for 30 s ± 1 s, then stir and mix at high speed for 30 s ± 1 s, stop for 90 s ± 1 s, during which scrape the mortar on the blades and the pot wall into the middle of the pot, and finally stir and mix at high speed for 60 s ± 1 s; obtain a mortar mixture.

[0068] (4) Place the mortar mixture on a mortar fluidity tester and detect its fluidity value by the mortar fluidity detection method.

[0069] (5) Repeat the process of putting the mortar mixture obtained in (1) to (3) into a 40*40*160 prism mold, and conduct a mortar compaction / vibration molding test with a molding table. That is, obtain mortar test blocks for strength testing and obtain the compressive strength. The various material ratios and various macroscopic properties of the metallurgical solid waste cementitious material mortar test blocks prepared are shown in Table 1.

[0070] Table 1

[0071]

[0072]

[0073] By comparing the results of Example 1, Example 2, Example 3, Example 4 and Comparative Example 1, it is concluded that by adjusting the raw material ratios of lime kiln waste residue, steel slag and slag, the 28-day compressive strength all reached above 30 MPa, but the early strength of Example 1, Example 2, Example 3, Example 4 increased compared with Comparative Example 1. Comparing the 28-day compressive strength results of Example 1, Example 2, Example 4 and Comparative Example 1, the 28-day strength decreased, proving that as the amount of lime kiln waste residue increased and the content of steel slag decreased, the subsequent strength supply was insufficient. However, the mixing ratio scheme of Example 3 with 8% lime kiln waste residue increased the later strength while ensuring the increase of early strength, proving that the mixing ratio scheme with 8% lime kiln waste residue content was the optimal mixing ratio. The 28-day compressive strength of this scheme with 4% - 10% lime kiln waste residue added and the raw material ratio scheme of steel slag and slag adjusted all reached above 30 MPa, and the fluidity was also greater than 180 mm under the water-binder ratio of 0.5.

[0074] One or more technical solutions in the embodiments of the present invention at least further have the following technical effects or advantages:

[0075] (1) For the first time, this cementitious material is made by drying and grinding three kinds of solid wastes, namely lime kiln waste residue, steel slag and slag. By adjusting the content of lime kiln waste residue, the early strength is improved, and a large amount of steel slag is added to provide the growth of later strength, so as to produce a cementitious material that meets the strength requirements, consuming lime kiln waste residue and slag while making more full use of steel slag;

[0076] (2) Only by drying and grinding the raw materials can a lot of industrial solid wastes be consumed. It has the advantages of simple production process, wide material sources and low prices, reducing the cost. No chemical reagents and high-temperature calcination are required, reducing the risk of environmental pollution caused by adding chemical reagents, thus solving the technical problem in the prior art that it is difficult to comprehensively utilize metallurgical solid waste residues without adding chemical reagents;

[0077] (3) The heavy burden on society and the environment brought by solid waste residues such as lime kiln waste residue and steel slag is reduced. While protecting the environment, the production cost is reduced, and certain economic value can be generated, which can open up the market. This cementitious material prepared with lime kiln waste residue, steel slag and slag has a lower cost compared with traditional cement, reducing the high pollution problem of producing portland cement.

[0078] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features claimed in the present application.

Claims

1. A cementitious material using lime kiln waste slag-steel slag-mineral slag as raw materials, wherein the raw materials of the cementitious material include, by weight: 4 to 10 parts of lime kiln waste slag, 40 to 50 parts of steel slag and 45 to 60 parts of slag.

2. The cementitious material according to claim 1, characterized in that The specific surface area of ​​the gelling material is>500m 2 / kg.

3. The cementitious material according to claim 1, characterized in that The lime kiln waste residue, the steel slag and the slag are all on a dry basis.

4. The cementitious material according to claim 3, characterized in that Calculated by mass fraction, the moisture content of the dry basis is ≤0.1%.

5. The cementitious material according to claim 1, characterized in that: The components of the lime kiln waste slag include: CaO, CaCO3 and Ca(OH)2.

6. The cementitious material according to claim 1, characterized in that The steel slag is one or more of converter slag, open-hearth slag and electric furnace slag.

7. The cementitious material according to claim 1 or 6, characterized in that: The components of the steel slag include: FeO, Fe2O3, CaO, MgO and SiO2.

8. The cementitious material according to claim 1, characterized in that The components of the slag include silicate and aluminosilicate.

9. The cementitious material according to claim 1, characterized in that: The compressive strength of the cementitious material under standard curing conditions of 28 days is greater than 30 MPa.

10. A method for preparing a gelling material according to any one of claims 1 to 9, characterized in that: The method comprises: Mixing the lime kiln waste slag, the steel slag and the slag according to the weight parts to obtain a mixture; The mixed material is ground to obtain a gel material.

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