High-performance solid waste-based cementitious material and preparation method thereof

Abstract

The application discloses a kind of high-performance solid waste-based cementitious materials, each component and its weight percentage include: slag powder 40~60 parts, steel slag powder 15~30 parts, desulfurization gypsum 5~15 parts, cement clinker 5~15 parts, calcination aid 3~5 parts, chemical activator 1~3 parts;The calcination aid is obtained by sodium chloride, calcium chloride, sodium silicate compound;Chemical activator is obtained by sodium thio cyanate, sodium methylbenzenesulfonate, monoethanol diisopropanolamine, polyglycerol compound.The application realizes the resource utilization of steel slag, desulfurization gypsum, construction waste and other solid waste at the same time, can effectively take into account good early strength and later strength and other properties, effectively broaden the application range of solid waste-based cementitious materials, and is suitable for popularization and application.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a high-performance solid waste-based cementitious material and its preparation method. Background Technology

[0002] Carbon emissions in cement production mainly come from three sources: emissions from the decomposition of carbonate raw materials (process emissions), emissions from fuel combustion (combustion emissions), and emissions from electricity consumption in production equipment (indirect emissions). Currently, the main measures for carbon reduction in the cement industry are to reduce the amount of cement clinker used in production, increase the proportion of cement with low clinker content, and increase the use of new low-carbon cementitious materials.

[0003] Currently, the utilization rate of solid wastes from metallurgical waste in steel enterprises, apart from slag, is low, including steel slag and desulfurization ash. The resource utilization of large amounts of solid waste remains a significant problem hindering the sustainable development of the steel industry. The steel production process generates various solid wastes, such as slag, steel slag, recycled ash, furnace slag, low-grade fly ash, construction waste, iron tailings, and stone chips. Except for slag, the utilization rate and added value of a large amount of solid waste are low, gradually becoming a burden on the development of the enterprise's main business. Therefore, properly handling the solid waste generated by metallurgical enterprises and applying it to higher value-added products is an urgent task facing enterprise development.

[0004] There has been some research on the resource utilization of solid waste. For example, patent CN115572084A discloses a multi-steel slag synergistic solid waste-based cementitious material and its preparation method; patent CN115893896A provides a solid waste-based concrete composite mineral admixture. However, the solid waste-based cementitious materials obtained by the above-mentioned schemes still have problems such as low early strength and low upper limit of later strength, which to some extent limits their promotion and application. Summary of the Invention

[0005] The purpose of this invention is to address the problems and shortcomings of existing technologies by providing a high-performance solid waste-based cementitious material that can simultaneously utilize solid wastes such as steel slag, desulfurization gypsum, and construction waste, while also ensuring good early and late strength, thus effectively broadening the application range of solid waste-based cementitious materials.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A high-performance solid waste-based cementitious material comprises the following components and their respective weight percentages: 40-60 parts slag powder, 15-30 parts steel slag powder, 5-15 parts desulfurized gypsum, 5-15 parts cement clinker, 3-5 parts calcination aid, and 1-3 parts chemical activator; wherein the calcination aid is obtained by combining sodium chloride, calcium chloride, and sodium silicate; and the chemical activator is obtained by combining sodium sulfate, sodium thiocyanate, sodium toluenesulfonate, diisopropanolamine monoethanolamine, and polyglycerol.

[0008] According to the above scheme, the main chemical components and their mass percentages in the slag powder include: SiO2 30~35%, CaO 35~40%, Al2O3 8~20%, Fe2O3 0.1~2%, MgO 6~12%, SO3 2~5%. After grinding, the slag meets the activity requirements of S95 grade or above in the national standard, and its specific surface area is 400~420 m². 2 / kg.

[0009] Furthermore, the slag can be made from water slag or the like.

[0010] According to the above scheme, the main chemical components and their mass percentages in the steel slag powder include: SiO2 15~25%, CaO 30~40%, Al2O3 3~8%, Fe2O3 10~25%, MgO 10~15%, SO3 0.2~2%, and loss on ignition ≤8%; the specific surface area is 300~350 m² / g. 2 / kg.

[0011] Furthermore, the steel slag powder is obtained by grinding steel slag using a roller press.

[0012] According to the above scheme, the main chemical components and their mass percentages in the desulfurized gypsum include: CaO 25~29%, SO3 42~48%, and loss on ignition 20~30%.

[0013] Furthermore, the desulfurized gypsum is prepared by pre-drying the undisturbed desulfurized gypsum at 170°C to a moisture content of approximately 8-12%.

[0014] According to the above scheme, the main chemical components and their mass percentages in the cement clinker include: SiO2 20~24%, CaO 60~67%, Al2O3 3~8%, Fe2O3 2.5~8%; its specific surface area is 380~420 m². 2 / kg.

[0015] According to the above scheme, the mass ratio of sodium chloride, calcium chloride and sodium silicate in the calcination aid is (10~15):(4~8):(2~4), which helps to lower the melting point of minerals. In the high-temperature molten state, it promotes the adhesion of calcium chloride and sodium silicate to the surface of C2S in the liquid phase, which is beneficial to promote the hydration of mineral phases such as C2S in steel slag powder, thereby improving its early strength, etc.

[0016] According to the above scheme, in the chemical activator, the mass ratio of sodium sulfate, sodium thiocyanate, sodium methylbenzenesulfonate, diisopropanolamine monoethanolamine, and polyglycerol is (3~8):(4~6):(0.2~0.6):(0.3~0.8):(0.1~0.5), which simultaneously has the functions of aiding grinding and activating hydration activity.

[0017] The preparation method of the above-mentioned high-performance solid waste-based cementitious material includes the following steps:

[0018] 1) Weigh out steel slag powder and desulfurized gypsum according to the proportion, and ensure that the chemical composition of the resulting mixture I meets the following requirements: SiO2 10~20%, CaO 30~35%, Al2O3 3~7%, Fe2O3 1.5~3%, SO3 10~20%, and loss on ignition ≤2.5%;

[0019] 2) Add calcination aid to the obtained mixture I and calcine at high temperature;

[0020] 3) Mix the calcined material obtained in step 2) with the weighed slag powder and cement clinker, add a chemical activator, and grind until the specific surface area is 450 m². 2 The high-performance solid waste-based cementitious material is obtained by obtaining a weight of / kg or more.

[0021] In the above scheme, the high-temperature calcination temperature is 700~750℃, and the high-temperature residence time is 20~30s.

[0022] This invention combines highly active slag from steel plants with low-activity solid waste, adds a small amount of clinker and chemical reagents, and uses mechanical grinding activation, combined calcination, synergistic activation between components, and activation by external activators to prepare high-performance solid waste-based cementitious materials with strengths reaching PO 42.5 cement strength grade, and in some cases reaching PI 52.5 cement strength grade.

[0023] The principle of this invention is as follows:

[0024] The solid waste-based cementitious material of this invention can form products mainly composed of needle-like ettringite, flocculent CSH gel, and flake-like Ca(OH)2 during early hydration: early hydration of cement clinker forms hydrated calcium aluminate and produces a large amount of Ca(OH)2. Steel slag contains a large amount of oxides, and its alkalinity increases after thermal activation and calcination. The chemical activator is alkaline, which will cause OH... -Increased concentration leads to crystal precipitation, which in turn reacts with active silica and alumina in the mineral powder, as well as sulfate ions in the gypsum, to form ettringite, CSH gel, etc. (i.e., alkali-activated). This invention uses steel slag powder and desulfurized gypsum to be calcined together under calcination aid conditions. This promotes the transformation of desulfurized gypsum into β-type gypsum and effectively activates the activity of silica and alumina in the steel slag powder, forming an SCSA system (silicon-aluminum-sulfur-calcium coupling system). During the early hydration process, the rate of ettringite formation doubles, significantly improving early strength. As the hydration reaction continues, the amount of platy Ca(OH)₂ in the later hydration products gradually decreases, but the amount of ettringite and CSH gel significantly increases. This is because, as the hydration reaction continues, the potential activity of ultrafine slag powder (secondary hydration) and steel slag powder (C2S formed after calcination) is gradually activated, and the amount of calcium hydroxide is continuously consumed. The system forms a framework of ettringite, with CSH gel and other hydration products filling the framework and pores, making the structure more compact and macroscopically resulting in a significant improvement in mechanical properties. Furthermore, the ultrafine grinding process used in this invention effectively increases the contact area with water during hydration, with a more significant effect at low water-cement ratios. It can fill most of the voids, reducing the free water required to maintain the workability of the paste and effectively improving the strength of concrete.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1) This invention firstly utilizes desulfurized gypsum and steel slag powder to perform pre-calcination under the condition of calcination aid. The sulfate ions of desulfurized gypsum and calcination aid reduce the melting point of some minerals in steel slag powder, which can effectively eliminate the instability of free calcium oxide and magnesium oxide. On the other hand, it can dissolve some of the densely crystalline and coarse-grained minerals in steel slag powder, forming more C3S, C2S and other minerals, increasing the activity of steel slag powder, forming a silicon-aluminum-sulfur-calcium coupling system, which can effectively improve early strength, etc.

[0027] 2) The calcined material (gypsum-steel slag powder) obtained by calcination can be further ground with slag powder and cement clinker to further exert the effects of alkali activation and sulfate activation, effectively taking into account the early and late strength of the concrete. Attached Figure Description

[0028] Figure 1 SEM images of the cement paste sample obtained in Comparative Example 1 after 3 days of hydration; where (a) scale bar is 200 nm and (b) scale bar is 1 μm.

[0029] Figure 2 SEM images of the cement paste sample obtained in Comparative Example 2 after 3 days of hydration; where (a) scale bar is 200 nm and (b) scale bar is 1 μm;

[0030] Figure 3 The image shows the SEM images of the cement paste sample obtained in Example 3 after 3 days of hydration; where (a) is a scale bar of 200 nm and (b) is a scale bar of 1 μm.

[0031] Figure 4 SEM images of the cement paste sample obtained in Example 4 after 3 days of hydration; where (a) scale bar is 200 nm, and (b) scale bar is 1 μm;

[0032] Figure 5 SEM images of the cement paste sample obtained in Comparative Example 1 after 28 days of hydration; where (a) scale bar is 1 μm and (b) scale bar is 2 μm;

[0033] Figure 6 SEM images of the cement paste sample obtained in Comparative Example 2 after 28 days of hydration; where (a) scale bar is 1 μm and (b) scale bar is 2 μm;

[0034] Figure 7 SEM images of the cement paste sample obtained in Example 3 after 28 days of hydration; where (a) scale bar is 1 μm and (b) scale bar is 2 μm;

[0035] Figure 8 The image shows the SEM images of the cement paste sample obtained in Example 4 after 28 days of hydration; where (a) is a scale bar of 1 μm and (b) is a scale bar of 2 μm. Detailed Implementation

[0036] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.

[0037] The specific implementation method uses the following components by weight: 40-60 parts slag, 15-30 parts steel slag, 5-15 parts desulfurized gypsum, 5-15 parts cement clinker, 3-5 parts calcination aid, and 1-3 parts chemical activator.

[0038] In the following examples, the slag used is water slag, a by-product of blast furnace ironmaking and water quenching at Wuhan Iron and Steel Group. Its main chemical components and their weight percentages include: SiO2 30~35%, CaO 35~40%, Al2O3 8~20%, Fe2O3 0.1~2%, MgO 6~12%, SO3 2~5%, which meets the activity requirements of S95 grade or above in the national standard after grinding.

[0039] The steel slag used was provided by Baowu Environmental Technology Investment Co., Ltd., and its main chemical components and their weight percentages include: SiO2 15~25%, CaO 30~40%, Al2O3 3~8%, Fe2O3 10~25%, MgO 10~15%, SO3 0.2~2%, and loss on ignition ≤8%.

[0040] The original desulfurization gypsum used was provided by Qingshan Power Plant. Its main chemical components and their weight percentages include: CaO 25~29%, SO3 42~48%, and loss on ignition 20~30%.

[0041] The cement clinker used was supplied by Hubei Daye Jianfeng Cement, and its main chemical components and their weight percentages include: SiO2 20~24%, CaO 60~67%, Al2O3 3~8%, Fe2O3 2.5~8%.

[0042] The calcination aid used is a mixture of sodium chloride, calcium chloride and sodium silicate in a mass ratio of (10-15):(4-8):(2-4), which helps to lower the melting point of minerals. The ratio of calcination aid in Comparative Example 1 and Examples 1-8 is 10:6:4.

[0043] The chemical activator used is a mixture of sodium sulfate, sodium thiocyanate, sodium methylbenzenesulfonate, monoethanolamine, isopropanolamine, and polyglycerol in a mass ratio of (3-8):(4-6):(0.2-0.6):(0.3-0.8):(0.1-0.5). It has the functions of both aiding grinding and activating hydration. The chemical activator ratio in the comparative example and the embodiment is 5:5:0.5:0.4:0.3.

[0044] Examples 1-5

[0045] The specific preparation process of the high-performance solid waste-based cementitious materials described in Examples 1-5 is as follows:

[0046] 1) Grinding steel slag using a roller press yields a specific surface area of ​​300 m². 2 Steel slag powder of / kg or above;

[0047] 2) Pre-dry the undisturbed desulfurized gypsum at 170℃ to ensure that the moisture content is reduced to 8-12%;

[0048] 3) Mix the products obtained in 1) and 2) according to the specified proportions, while ensuring that the chemical composition of the resulting mixture meets the following requirements: SiO2 12~17%, CaO 31~33%, Al2O3 3~5%, Fe2O3 11~15%, SO3 10~18%, and loss on ignition ≤2.5%;

[0049] 4) Add calcination aid to the mixture obtained in step 3) and calcine at 700℃ for 20 seconds;

[0050] 5) The water slag, after being ground by a vertical mill, has a specific surface area of ​​410 m². 2 / kg of slag powder;

[0051] 6) The clinker, after being ground by a roller press, has a specific surface area of ​​330 m². 2 / kg of cooked powder;

[0052] 7) Mix the powders obtained in steps 4) to 6) in a ball mill according to the proportions (see Table 1 for details), add the activator, and grind until the specific surface area is 600 m². 2 / Kg, thus obtaining the high-performance solid waste-based cementitious material.

[0053] Comparative Example 1

[0054] A solid waste-based cementitious material, the specific preparation process of which is as follows:

[0055] 1) Grinding steel slag using a roller press yields a specific surface area of ​​300 m². 2 Steel slag powder of / kg or above;

[0056] 2) Pre-dry the undisturbed desulfurized gypsum at 170℃ to ensure that the moisture content is reduced to 8-12%;

[0057] 3) The water slag, after being ground by a vertical mill, has a specific surface area of ​​410 m². 2 / kg of slag powder;

[0058] 4) Cement clinker, after being ground by a roller press, has a specific surface area of ​​330 m². 2 / kg of cement clinker powder;

[0059] 5) Mix the powders obtained in steps 1) to 4) in a ball mill according to the proportions (see Table 1 for details), add the activator, and grind until the specific surface area is 600 m². 2 / kg, thus obtaining the solid waste-based cementitious material of Comparative Example 1.

[0060] Comparative Example 2

[0061] A solid waste-based cementitious material, the specific preparation process of which is as follows:

[0062] 1) Grinding steel slag using a roller press yields a specific surface area of ​​300 m². 2 Steel slag powder of / kg or above;

[0063] 2) Pre-dry the undisturbed desulfurized gypsum at 170℃ to ensure that the moisture content is reduced to 8-12%;

[0064] 3) The products obtained in 1) and 2) are mixed in proportion, while ensuring that the chemical composition of the resulting mixture meets the following requirements: SiO2 12-17%, CaO 31-33%, Al2O3 3-5%, Fe2O3 11-15%, SO3 8-20%, and loss on ignition ≤2.5%;

[0065] 4) Calcine the mixture obtained in step 3) at 700℃ for 20 seconds;

[0066] 5) The water slag, after being ground by a vertical mill, has a specific surface area of ​​410 m². 2 / kg of slag powder;

[0067] 6) The clinker, after being ground by a roller press, has a specific surface area of ​​330 m². 2 / kg of cooked powder;

[0068] 7) Mix the powders obtained in steps 4) to 6) in a ball mill according to the proportions (see Table 1 for details) and grind them until the specific surface area is 600 m². 2 / kg, thus obtaining the solid waste-based cementitious material.

[0069] Comparative Example 3

[0070] A solid waste-based cementitious material, the specific preparation process of which is as follows:

[0071] 1) Grinding steel slag using a roller press yields a specific surface area of ​​300 m². 2 Steel slag powder of / kg or above;

[0072] 2) Pre-dry the undisturbed desulfurized gypsum at 170℃ to ensure that the moisture content is reduced to 8-12%;

[0073] 3) Mix the products obtained in 1) and 2) according to the specified proportions, while ensuring that the chemical composition of the resulting mixture meets the following requirements: SiO2 12~17%, CaO 31~33%, Al2O3 3~5%, Fe2O3 11~15%, SO3 10~18%, and loss on ignition ≤2.5%;

[0074] 4) Add the mixture obtained in step 3) to a calcination aid with a calcium chloride to sodium chloride mass ratio of 1:1, and calcine at 700℃ for 20s.

[0075] 5) The water slag, after being ground by a vertical mill, has a specific surface area of ​​410 m². 2 / kg of slag powder;

[0076] 6) The clinker, after being ground by a roller press, has a specific surface area of ​​330 m². 2 / kg of cooked powder;

[0077] 7) Mix the powders obtained in steps 4) to 6) in a ball mill according to the proportions (see Table 1 for details) and grind them until the specific surface area is 600 m². 2 / kg, thus obtaining the solid waste-based cementitious material.

[0078] Table 1. Proportions (parts by weight) of the high-performance solid waste-based cementitious materials described in Comparative Examples 1-2 and Examples 1-5

[0079]

[0080] Table 2. Components and specific surface areas of the solid waste-based cementitious materials described in Comparative Examples 1-2 and Examples 1-5

[0081]

[0082] In Table 2, the content of each chemical component is expressed in parts by weight.

[0083] The high-performance solid waste-based cementitious materials corresponding to the embodiments described in Table 1 were mixed with standard sand at a weight ratio of 1:3, and then cement mortar was obtained at a water-cement ratio of 0.5 or 0.45. The specific performance test results are shown in Tables 3 and 4. For comparison, pure ordinary Portland cement (PO 42.5) was also prepared as the reference group S of cementitious materials.

[0084] Table 3. Test results of mortar strength for each embodiment, benchmark group, and control group.

[0085]

[0086] Table 4. Test results of mortar strength for each embodiment, benchmark group, and control group.

[0087]

[0088] As can be seen from the data results in Table 3, compared with the AS group using pure ordinary Portland cement, the 3-day and 28-day strengths of Examples 1-5 all meet the technical requirements for the strength of PO 42.5 cement in GB / T175 "General Portland Cement". The products that were not calcined or did not contain an activator do not meet the technical requirements for the strength of PO 42.5 cement in GB / T175 "General Portland Cement".

[0089] As can be seen from the data results in Table 4, compared with the reference group using pure ordinary Portland cement, the 3-day and 28-day strengths of the cement mortars obtained in Examples 1-5 are better than those of ordinary Portland cement, indicating that the effect of high-strength and high-performance solid waste-based cementitious materials is more significant when the water-cement ratio is smaller.

[0090] Figures 1-8SEM images of cement paste (water-cement ratio of 0.28) samples obtained from Comparative Examples 1-3 and Examples 3-4, taken at 3 days and 28 days of hydration, are shown. From the 3-day SEM images, it can be seen that the samples from Comparative Examples 1 and 2 contain significantly less ettringite than those from Examples 3 and 4. Furthermore, Comparative Examples 1 and 2 also exhibit more porosity defects, resulting in lower 3-day compressive strength for Comparative Examples 1 and 2 compared to Examples 3 and 4. In contrast, the samples from Examples 3 and 4 show no significant differences in the quantity, size, and porosity of ettringite, and their 3-day compressive strengths are also similar. Moreover, it can be observed that the ettringite in Examples 3 and 4 forms a more distinct network structure, while the slower hydration rate in Comparative Examples 1 and 2 results in a network structure that is still in its initial stage. This explains why the 3-day compressive strength of Comparative Example 2 is lower than that of Examples 3 and 4. The 28-day SEM images of the hydrated samples show that the structures of the hydrates obtained in Examples 3 and 4 are much denser than those in Comparative Examples 1 and 2. Comparative Examples 1 and 2 still exhibit numerous porosity defects, as evidenced by the lower 28-day compressive strength of Comparative Example 2 compared to Samples 3 and 4. This indicates that the strength of the cementitious material obtained in this invention is significantly affected at each stage.

[0091] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-performance solid waste-based cementitious material, characterized in that, The components and their respective weight percentages include: 40-60 parts slag powder, 15-30 parts steel slag powder, 5-15 parts desulfurized gypsum, 5-15 parts cement clinker, 3-5 parts calcination aid, and 1-3 parts chemical activator; the calcination aid is obtained by combining sodium chloride, calcium chloride, and sodium silicate; the chemical activator is obtained by combining sodium sulfate, sodium thiocyanate, sodium toluenesulfonate, diisopropanolamine monoethanolamine, and polyglycerol. The preparation method of the high-performance solid waste-based cementitious material includes the following steps: 1) Weigh out steel slag powder and desulfurized gypsum according to the proportion, and ensure that the chemical composition of the resulting mixture I meets the following requirements: SiO2 10~20%, CaO 30~35%, Al2O3 3~7%, Fe2O3 1.5~3%, SO3 10~20%, and loss on ignition ≤2.5%; 2) Add calcination aid to the obtained mixture I and calcine at high temperature; 3) Mix the calcined material obtained in step 2) with the weighed slag powder and cement clinker, add a chemical activator, and grind until the specific surface area is 450 m². 2 The high-performance solid waste-based cementitious material is obtained by obtaining a weight of / kg or more.

2. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, The main chemical components and their mass percentages in the slag powder include: SiO2 30-35%, CaO 35-40%, Al2O3 8-20%, Fe2O3 0.1-2%, MgO 6-12%, SO3 2-5%, and its specific surface area is 400-420 m². 2 / kg.

3. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, The main chemical components and their mass percentages in the steel slag powder include: SiO2 15~25%, CaO 30~40%, Al2O3 3~8%, Fe2O3 10~25%, MgO 10~15%, SO3 0.2~2%, and loss on ignition ≤8%; the specific surface area is 300~350 m². 2 / kg.

4. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, The main chemical components and their mass percentages in the desulfurized gypsum include: CaO 25-29%, SO3 42-48%, and loss on ignition 20-30%.

5. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, The main chemical components and their mass percentages in the cement clinker include: SiO2 20~24%, CaO 60~67%, Al2O3 3~8%, Fe2O3 2.5~8%; its specific surface area is 380~420 m². 2 / kg.

6. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, In the calcination aid, the mass ratio of sodium chloride, calcium chloride and sodium silicate is (10~15):(4~8):(2~4).

7. The high-performance solid waste-based cementitious material according to claim 1, characterized in that, In the chemical activator, the mass ratio of sodium sulfate, sodium thiocyanate, sodium methylbenzenesulfonate, diisopropanolamine monoethanolamine, and polyglycerol is (3~8):(4~6):(0.2~0.6):(0.3~0.8):(0.1~0.5).

8. A method for preparing the high-performance solid waste-based cementitious material according to any one of claims 1 to 7, characterized in that, Includes the following steps: 1) Weigh out steel slag powder and desulfurized gypsum according to the proportion, and ensure that the chemical composition of the resulting mixture I meets the following requirements: SiO2 10~20%, CaO 30~35%, Al2O3 3~7%, Fe2O3 1.5~3%, SO3 10~20%, and loss on ignition ≤2.5%; 2) Add calcination aid to the obtained mixture I and calcine at high temperature; 3) Mix the calcined material obtained in step 2) with the weighed slag powder and cement clinker, add a chemical activator, and grind until the specific surface area is 450 m². 2 The high-performance solid waste-based cementitious material is obtained by obtaining a weight of / kg or more.

9. The preparation method according to claim 8, characterized in that, The high-temperature calcination temperature is 700~750℃, and the time is 20~30s.

Images