Preparation method and application of ternary mixed cementing material

Abstract

The invention discloses a preparation method and application of a ternary mixed cementing material. The ternary mixed cementing material is prepared by mixing rare earth tailings rich in tubular halloysite, limestone and Portland cement or cement clinker according to a certain proportion. Based on the characteristics of large specific surface area, low order degree and multiple surface active sites of tubular halloysite, the tubular halloysite shows high volcanic ash and gelling activity after heat treatment, and the ternary mixed gelling material prepared from the rare earth tailings rich in tubular halloysite has good mechanical properties and durability; the ternary mixed cementitious material can replace a large amount of Portland cement, the production cost and energy consumption of cement clinker preparation are reduced, and the compressive strength of the ternary mixed cementitious material meets the strength standard of common concrete, so that the ternary mixed cementitious material has wide application prospects in the fields of solid waste resource utilization and building materials.

Description

Technical Field

[0001] The invention belongs to the technical field of resource utilization of solid waste and material preparation, and relates to a preparation method and application of a ternary mixed cementitious material, and specifically relates to a ternary mixed cementitious material prepared from rare earth tailings rich in tubular halloysite and its application. Background Art

[0002] Rare earth elements are mainly medium and heavy rare earths (such as dysprosium, gadolinium, terbium and other elements). Weathering crust eluting rare earth deposits have the characteristics of large reserves, wide distribution, high content of medium and heavy rare earths, complete distribution, and good mining and smelting performance. This type of rare earth ore has another important feature that is different from fluorocarbon cerium ore, that is, this type of rare earth ore is rich in clay minerals. Clay minerals are the main minerals in the weathering crust of this type of deposit, and their content in the entire weathering layer is usually 40% to 70%, such as halloysite, kaolinite and illite. The rare earths are mainly adsorbed on the surface of clay minerals in the form of (hydrated) cations. Therefore, weathering crust eluting rare earth ores can simply extract rare earth elements through in situ leaching and other beneficiation methods, which is beneficial to their development and utilization.

[0003] In the process of mining weathering crust elution type rare earth resources, the process of extracting rare earth elements such as in-situ leaching is generally adopted. The rare earth is dissolved by adding a large amount of leaching agents, and a large amount of weathering crust slag (tailings) remains in the original place. These tailings significantly reduce the rare earth elements in the chemical composition of the weathering crust elution type rare earth ore body, but there is not much difference in the mineral composition from the original ore body, and still contain a large amount of clay minerals, such as halloysite, kaolinite, illite, etc. Due to the leaching and ore dressing process, this type of weathering crust soil is loose, and it is easy to form soil erosion and even cause disasters such as landslides under conditions such as rain. Therefore, the tailings of the weathering crust type rare earth ore from which rare earth elements have been extracted must be effectively and reasonably disposed of.

[0004] Chinese invention patent CN201911288013.2 discloses a method and product for preparing foamed ceramic thermal insulation materials with low energy consumption using fluorocarbon cerium rare earth tailings. The fluorocarbon cerium rare earth tailings are used as the main raw material, and the foamed ceramic thermal insulation materials are successfully prepared through the combination of fluorocarbon cerium rare earth tailings with kaolin, quartz, and foaming agent, which effectively reduces the sintering temperature and realizes the low-energy preparation of foamed ceramic thermal insulation materials. Chinese invention patent CN202110033472.7 discloses a method for preparing cement clinker using rare earth tailings. The patent uses rare earth tailings taken from fluorocarbon cerium rare earth deposits in Mianning and Dechang, Sichuan Province. Most of these rare earth mines are open-pit mining, but the disorderly mining phenomenon has seriously led to the accumulation of a large amount of tailings, causing serious environmental pollution.

[0005] This technology not only utilizes the chemical composition characteristics of fluorocarbon cerium ore-type rare earth tailings, which contain silicon, aluminum, iron, calcium, etc., which are highly similar to cement components, but also based on the characteristics that this type of rare earth tailings still contain a small amount of rare earth minerals and are rich in fluorite and strontium barium minerals. After sorting and enrichment, the rare earth tailings are mixed with cement raw materials and ground, and calcined at high temperature of 1450℃ to produce cement clinker. The prepared cement clinker has a strength of 30.0MPa in 3 days, 40.0MPa in 7 days, and 45.0MPa in 28 days. Chinese invention patent CN202210596806.6 discloses a method for preparing low-aluminate tricalcium phase general-purpose silicate cement clinker using fluorocarbon cerium ore-type rare earth tailings. The invention mixes and grinds limestone, basalt, sandstone, aluminum ore waste rock and rare earth tailings (dosage ≤10wt%), then adds burnt coal ash and calcines at high temperature to obtain low-aluminate tricalcium phase general-purpose silicate cement clinker. The prepared cement clinker has a 3-day strength of 35.0MPa and a 28-day strength of 55.0MPa.

[0006] The rare earth tailings targeted by the above technology are bastnaesite-type rare earth tailings produced by bastnaesite mining. The characteristics of this type of tailings are that they are rich in mineral phases such as fluorite and barite, and the amount of rare earth tailings added (dosage) for the preparation of cement clinker and foamed ceramics is relatively low. Since the physical phase and composition characteristics of the weathering crust elution-type rare earth tailings in South China are rich in clay minerals such as halloysite and kaolinite, which are quite different from the physical phase and composition of the above-mentioned bastnaesite-type rare earth tailings, it is necessary to develop methods and technologies for its resource utilization based on its actual physical phase characteristics.

[0007] The parent rock of ionic rare earth mineralization in Ganzhou, Jiangxi Province is mainly weathered granite. The chemical composition of the rock is mainly SiO2. Ionic rare earth is mainly adsorbed on clay minerals such as kaolinite, halloysite, and illite. The abundance of rare earth elements reaches 200×10 -6 ~500×10 -6The types and forms of clay minerals in the weathering crust section show zonation. The clay minerals from the surface soil layer to the middle and upper part of the fully weathered layer are mainly euhedral high-crystallinity kaolinite, while the clay minerals from the middle and lower part of the fully weathered layer to the semi-weathered layer are mainly short tubular halloysite and low-crystallinity kaolinite. Kaolinite and halloysite in the weathering crust of Meizhou Renju are the main adsorption carriers of ion-exchange rare earths. The content and distribution of halloysite are closely related to the enrichment of rare earth elements in the weathering crust, and play an important role in the rare earth enrichment mechanism of the weathering crust. A wealth of research reports show that many weathering crust elution-type rare earth ore bodies in South China, such as Ganzhou, Jiangxi and Meizhou, Guangdong, are rich in clay minerals such as halloysite and kaolinite. The quartz, feldspar and other components in this type of tailings that coexist with clay minerals are also rich in silicate minerals. Therefore, weathering crust elution-type rare earth tailings have great potential in the preparation of cementitious materials. In particular, the ion adsorption-type rare earth tailings in South China are rich in halloysite. Halloysite is a 1:1 type dioctahedral layered silicate mineral, usually in a nanotube structure, with a large specific surface area, low order, and many surface active sites. Studies have shown that halloysite exhibits high volcanic ash and gelling activity after heat treatment (calcination), and has the potential to be used as a cement raw material or active admixture. However, in the tailings system, whether it is suitable for the preparation of cementitious materials has not been reported.

[0008] To this end, the present invention is based on the fact that weathering crust elution type rare earth tailings are in urgent need of resource utilization, and there has been no research on the preparation of cementitious materials from weathering crust elution type rare earth tailings. The present invention makes full use of the mineral characteristics of weathering crust elution type rare earth tailings in South China that are rich in tubular halloysite, and uses it as an auxiliary cementitious material for concrete to prepare a ternary mixed cementitious material with limestone and silicate cement or cement clinker. Summary of the invention

[0009] In view of the above problems, in order to realize the resource utilization of rare earth tailings, the present invention provides a method for preparing a ternary mixed cementitious material using rare earth tailings rich in tubular halloysite, which reduces the production cost of the cementitious material by replacing a large amount of silicate cement or cement clinker. At the same time, the prepared ternary mixed cementitious material can meet the C55 concrete strength standard.

[0010] The technical solution of the present invention is further explained below in conjunction with specific implementation methods.

[0011] The present invention first discloses a method for preparing a ternary mixed gelling material, comprising the following steps:

[0012] (1) purifying rare earth tailings rich in tubular halloysite to obtain clay powder;

[0013] (2) calcining the clay powder to obtain a calcined activated material;

[0014] (3) mixing the calcined activated material, limestone, silicate cement and water to obtain a solid mixture;

[0015] (4) The solid mixture is injected into a mold and naturally cured at room temperature for 24 hours to obtain a ternary mixed cementitious material.

[0016] Furthermore, the content of tubular halloysite phase in the tubular halloysite-rich rare earth tailings in step (1) is ≥10%.

[0017] Furthermore, the rare earth tailings rich in tubular halloysite in step (1) include:

[0018] The mass percentage is 55% to 70% SiO2, 25% to 35% Al2O3, 3% to 7% K2O, 1% to 3% Fe2O3, and the remainder is impurities.

[0019] Furthermore, the residual impurities include but are not limited to: MgO, Na2O, and MnO.

[0020] Furthermore, the purification in step (1) comprises the following steps:

[0021] The rare earth tailings rich in tubular halloysite are placed in a magnetic separator for magnetic separation and iron removal. The magnetic separator has 8 permanent magnetic bars, and the surface magnetism of each magnetic bar is 14000Gs. A total of 3 cycles of magnetic separation are performed, and the iron-removed tailings are obtained by drying.

[0022] The iron-removing tailings are crushed and then passed through a 100-300 mesh sieve to obtain clay powder.

[0023] Furthermore, the heat treatment temperature in step (2) is 600-800° C., and the heat treatment time is 1-2.5 h.

[0024] Furthermore, the weight proportions of the calcined activated material, limestone and silicate cement in step (3) are respectively:

[0025] 12.5-45 parts of roasted activated materials, 7.5-20 parts of limestone, and 35-80 parts of Portland cement.

[0026] Furthermore, the amount of water added in step (3) is 0.3 to 0.5 times the mass of the mixture of the roasted activated material, limestone and silicate cement;

[0027] The water also includes a polycarboxylate water reducer;

[0028] The added amount of the polycarboxylate water reducer is 0%-1% of the mass of the mixed roasted activated material, limestone and silicate cement.

[0029] Furthermore, the mold size in step (4) is 35*35*35cm3 .

[0030] The invention also discloses a ternary mixed gelling material prepared according to any of the above preparation methods.

[0031] The invention also discloses an application of the ternary mixed gelling material in the field of building material filling and construction engineering.

[0032] Furthermore, the application includes:

[0033] The prepared ternary mixed cementitious material is used as a filling material or as a concrete building material.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) In the prior art, in the field of cementitious material preparation, such as CN202110033472.7 and CN202210596806.6, the rare earth tailings used are all bastnaesite-type rare earth tailings, which are mainly produced in the continental trough light rare earth ore belt in Dechang County, Sichuan Province, and are rich in mineral phases such as fluorite and barite. The rare earth tailings used in the present invention are weathering crust elution-type rare earth tailings, which are mainly produced in Ganzhou, Jiangxi, Meizhou, Guangdong and other southern China regions. ; The weathering crust elution type rare earth tailings and the fluorocarbon cerium ore type rare earth tailings have great differences in phase and composition. There is not much difference in mineral composition from the original ore body, and they still contain a large amount of clay minerals, such as halloysite, kaolinite, illite, etc., especially, they are rich in tubular halloysite, which has the characteristics of large specific surface area, low degree of order, and many surface active sites. After heat treatment (calcination), they show high volcanic ash and cementing activity, and have the potential to be used as cement raw material or active admixture.

[0036] (2) The fluorocarbon cerium ore type rare earth tailings used in CN201911288013.2, CN202110033472.7, CN202210596806.6 and CN202210757951.8 are used in the technical fields of cement clinker, foamed ceramics, pressed bricks, etc.; although CN202111450353.8 and CN201610158180.5 used rare earth tailings rich in tubular halloysite, they were only limited to the technical fields of rare earth recovery and porous expanded clay. The present invention is the first to apply rare earth tailings rich in tubular halloysite to the field of cementitious materials, giving full play to the advantages of the mineral composition of weathering crust elution type rare earth tailings in the field of cementitious materials, and expanding the application scope of this type of rare earth tailings.

[0037] (3) In the prior art, the amount of rare earth tailings added (dosage) in the technical fields of cement clinker and porous ceramsite is relatively low. CN202110033472.7 discloses a method for preparing cement clinker using rare earth tailings. The dosage of rare earth tailings in this patent is 2.5wt%~10.0wt%. CN202210596806.6 discloses a low-aluminate tricalcium phase general silicate cement prepared from rare earth tailings and a preparation method. The dosage of rare earth tailings in this patent is 1.0wt%~3.0wt%. In the ternary mixed cementitious material prepared by the present invention, the dosage of rare earth tailings rich in tubular halloysite is as high as 12.5wt%~45.0wt%. The rare earth tailings rich in tubular halloysite and limestone in the present invention replace 20%~65% of silicate cement, which can replace the use of silicate cement in large quantities, reduce the production cost and energy consumption of cement clinker preparation, and reduce carbon emissions in the production process.

[0038] (4) The compressive strength of the ternary mixed cementitious material prepared by the rare earth tailings rich in tubular halloysite in the present invention can reach 26.11 MPa, 45.28 MPa and 58.81 MPa at 3 days, 7 days and 28 days, respectively. The prepared ternary mixed cementitious material can meet the C55 concrete strength standard while reducing the material cost, and can meet the strength requirements of most concrete on the market, and has broad application prospects in the fields of solid waste resource utilization and building materials.

[0039] In general, the present invention gives full play to the mineral characteristics of tubular halloysite in the weathering crust elution type rare earth tailings in South China. Through simple purification and heat treatment, superior volcanic ash and cementing activity are obtained, and a ternary mixed cementitious material is prepared by replacing a large amount of silicate cement, which reduces the emission of CO2 and the consumption of resources in the preparation process of concrete materials. In addition, the preparation process of the ternary mixed cementitious material is simple, the conditions are mild, and the relevant parameters are easy to control and adjust. The ternary mixed cementitious material prepared from rare earth tailings rich in halloysite shows good mechanical properties and has broad application prospects. Therefore, based on the idea of ​​"using waste to treat pollution", the present invention proposes a ternary mixed cementitious material prepared from rare earth tailings rich in tubular halloysite and a method thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 X-ray diffraction diagram of rare earth tailings rich in tubular halloysite before and after heat treatment;

[0041] Figure 2 This is a scanning electron microscope image of rare earth tailings rich in tubular halloysite;

[0042] Figure 3 This is a scanning electron microscope image of the calcined activated material;

[0043] Figure 4 This is the scanning electron microscope image of the ternary mixed cementitious material (RET-50) after curing for 28 days;

[0044] Figure 5 Compressive strength diagrams for OPC, RET-25, RET-50 and RET-90 after curing for 3d, 7d and 28d. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with examples. It should be understood that the embodiments described in this specification are only for explaining the present invention, not for limiting the present invention, and the parameters, proportions, etc. of the embodiments can be selected according to local conditions without substantial effect on the results. In the embodiments, except for special instructions, all are conventional reagents and method steps in the art.

[0046] Example 1

[0047] A method for preparing a ternary mixed gelling material comprises the following steps:

[0048] (1) The rare earth tailings rich in tubular halloysite in this embodiment were taken from a rare earth mine in Longnan County, Ganzhou City, Jiangxi Province. The rare earth tailings rich in tubular halloysite were placed in a magnetic separator for three cycles of magnetic separation to remove iron, and the iron-removed tailings were obtained after drying, crushed and sieved through 200 mesh to obtain powder;

[0049] (2) placing the powder in a muffle furnace and calcining at 750° C. for 1 h to obtain a calcined activated material;

[0050] (3) 25 g of the calcined activated material, 15 g of limestone and 160 g of Portland cement were placed in a cement slurry mixer and mixed evenly, and 60 ml of water mixed with 1.2 g of a polycarboxylate water reducer was added and stirred rapidly to obtain a solid mixture;

[0051] (4) Pour the obtained solid mixture into a 35×35×35mm 3 The mold was placed in a cement mortar compaction table and compacted for 1 minute to form. After the film was sealed, it was naturally cured at room temperature for 24 hours. The test block was demoulded and named RET-25, and cured at room temperature for 3 days, 7 days and 28 days respectively.

[0052] Example 2

[0053] A method for preparing a ternary mixed gelling material comprises the following steps:

[0054] (1) The rare earth tailings rich in tubular halloysite in this embodiment were taken from a rare earth mine in Dingnan County, Ganzhou City, Jiangxi Province. The rare earth tailings rich in tubular halloysite were placed in a magnetic separator for three cycles of magnetic separation to remove iron, and the iron-removed tailings were obtained after drying, crushed and sieved through 200 mesh to obtain powder;

[0055] (2) placing the powder in a muffle furnace and calcining at 700° C. for 2 h to obtain a calcined activated material;

[0056] (3) 50 g of the calcined activated material, 30 g of limestone and 120 g of Portland cement were placed in a cement slurry mixer and mixed evenly, and 70 ml of water mixed with 1.2 g of a polycarboxylate water reducer was added and stirred rapidly to obtain a solid mixture;

[0057] (4) Pour the obtained solid mixture into a 35×35×35mm 3 The mold was placed in a cement mortar vibrating table and vibrated for 1 minute to form. After the film was sealed, it was naturally cured at room temperature for 24 hours. The test block was demoulded and named RET-50, and cured at room temperature for 3 days, 7 days and 28 days respectively.

[0058] Example 3

[0059] A method for preparing a ternary mixed gelling material comprises the following steps:

[0060] (1) The rare earth tailings rich in tubular halloysite in this embodiment were taken from a rare earth mine in Pingyuan County, Meizhou City, Guangdong Province. The rare earth tailings rich in tubular halloysite were placed in a magnetic separator for three cycles of magnetic separation to remove iron, and the iron-removed tailings were obtained after drying, crushed and sieved through 200 mesh to obtain powder;

[0061] (2) placing the powder in a muffle furnace and calcining at 800° C. for 1.5 h to obtain a calcined activated material;

[0062] (3) 90 g of the calcined activated material, 40 g of limestone and 70 g of Portland cement were placed in a cement slurry mixer and mixed evenly, and 80 ml of water mixed with 1.2 g of a polycarboxylate water reducer was added and stirred rapidly to obtain a solid mixture;

[0063] (4) Pour the obtained solid mixture into a 35×35×35mm 3 The mold was placed in a cement mortar vibrating table and vibrated for 1 minute to form a shape. After the film was sealed, it was naturally cured at room temperature for 24 hours. The test block was demoulded and named RET-90, and cured at room temperature for 3 days, 7 days and 28 days respectively.

[0064] Comparative Example 1

[0065] (1) The silicate cement used in this comparative example is commercial OPC (PO 42.5R), which complies with the Chinese standard GB175-2007;

[0066] (2) 200 g of Portland cement was placed in a cement slurry mixer, and 60 ml of water mixed with 1.2 g of polycarboxylate water reducer was added and stirred rapidly to obtain cement slurry;

[0067] (3) Pour the obtained cement slurry into a 35×35×35mm 3 The samples were placed in a mold and vibrated on a cement mortar vibrating table for 1 minute to form. After the film was sealed, they were naturally cured at room temperature for 24 hours. The test blocks were demoulded and named OPC, and cured at room temperature for 3 days, 7 days and 28 days respectively.

[0068] Specifically, the rare earth tailings rich in tubular halloysite used in Example 1 and the roasted activated material obtained after the heat treatment in step (2) were analyzed using an X-ray diffractometer, and the analysis results were as follows: Figure 1 Scanning electron microscopy was used to perform electron microscopy on the rare earth tailings rich in tubular halloysite in step (1) of Example 1, the roasted activated material obtained after heat treatment in step (2), and the ternary mixed cementitious material (RET-50) prepared in step (4) of Example 2 after curing for 28 days. The results are as follows: Figure 2 , Figure 3 and Figure 4 The compressive strength of RET-25 in Example 1, RET-50 in Example 2 and RET-90 in Example 3 were tested using a universal material testing machine. The test results are shown in Figure 5 shown.

[0069] From the attached Figure 1 From the XRD diffraction patterns of the rare earth tailings rich in tubular halloysite before and after heat treatment in Example 1, it can be seen that the main components of the rare earth tailings rich in tubular halloysite are halloysite, kaolinite, illite, feldspar and quartz, while the XRD ray diffraction reflections of halloysite and kaolinite in the calcined activated material after heat treatment disappear, and the reflection intensity of feldspar and illite weakens, indicating that these minerals are completely or partially transformed into an amorphous phase.

[0070] From the attached Figure 2 From the SEM image of the rare earth tailings rich in tubular halloysite in Example 1, it can be seen that in addition to irregularly shaped minerals, there are also many layered minerals in the rare earth tailings, which should be clay minerals.

[0071] From the attached Figure 3 The SEM image of the calcined activated material in Example 1 shows that after being calcined at 750° C. for 2 h in step (2), the halloysite and kaolinite can still maintain their original morphology.

[0072] From the attached Figure 4 The SEM image of the ternary mixed cementitious material (RET-50) prepared in Example 2 after curing for 28 days shows that after 28 days of curing, the ternary mixed cementitious material forms a relatively dense honeycomb structure through hydration reaction, which is CSH gelation.

[0073] From the attached Figure 5 The ternary mixed cementitious materials RET-25, RET-50 and RET-90 prepared using rare earth tailings rich in tubular halloysite in Examples 1-3 had compressive strengths of 26.6, 22.0 and 20.6 MPa at 3d, 45.7, 43.3 and 28.9 MPa at 7d, and 57.5, 54.9 and 41.4 MPa at 28d, respectively. The Portland cement test block OPC prepared in Example 1 had compressive strengths of 20.6, 25.9 and 41.1 MPa at 3d, 7d and 28d, respectively. The compressive strength of the ternary mixed cementitious materials RET-25, RET-50 and RET-90 prepared using rare earth tailings rich in tubular halloysite is better than that of the silicate cement test block OPC. The compressive strength of the ternary mixed cementitious material prepared in Example 2 is better than that in Example 3 and slightly lower than that in Example 1. However, the amount of rare earth tailings rich in tubular halloysite in Example 2 is twice that of the rare earth tailings rich in tubular halloysite in Example 1, indicating that the ternary mixed cementitious material RET-50 prepared using rare earth tailings rich in tubular halloysite in Example 2 is better than the ternary mixed cementitious material RET-25 prepared using rare earth tailings rich in tubular halloysite in Example 1.

[0074] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A method for preparing a ternary mixed gelling material, comprising: (1) purifying rare earth tailings rich in tubular halloysite to obtain clay powder; (2) heat treating the clay powder to obtain a calcined activated material; (3) fully mixing the calcined activated material, limestone and silicate cement, adding water and stirring evenly to obtain a solid mixture; (4) injecting the solid mixture into a mold, curing and molding it, and obtaining a ternary mixed gelling material.

2. The preparation method according to claim 1, wherein: The content of tubular halloysite phase in the rare earth tailings rich in tubular halloysite in step (1) is ≥ 10%; The rare earth tailings rich in tubular halloysite include: The mass percentage is 55% to 70% SiO2, 25% to 35% Al2O3, 3% to 7% K2O, 1% to 3% Fe2O3, and the remainder is impurities.

3. The preparation method according to claim 2, wherein: The remaining impurities include: MgO, Na2O, and MnO.

4. The preparation method according to claim 1, wherein: The purification in step (1) comprises the following steps: The rare earth tailings rich in tubular halloysite are placed in a magnetic separator for magnetic separation and iron removal, and the iron-removed tailings are obtained after drying; The iron-removing tailings are crushed and then passed through a 100-300 mesh sieve to obtain clay powder.

5. The preparation method according to claim 1, wherein: The heat treatment temperature in step (2) is 600-800° C., and the heat treatment time is 1-2.5 hours.

6. The preparation method according to claim 1, wherein: The weight proportions of the calcined activated material, limestone and silicate cement in step (3) are respectively: 12.5-45 parts of roasted activated materials, 7.5-20 parts of limestone, and 35-80 parts of Portland cement.

7. The preparation method according to claim 1, wherein: The amount of water added in step (3) is 0.3 to 0.5 times the mass of the mixed roasted activated material, limestone and silicate cement; The water also includes 0%-1% polycarboxylate water reducer; The added amount of the polycarboxylate water reducer is 0%-1% of the mass of the mixed roasted activated material, limestone and silicate cement.

8. The preparation method according to claim 1, wherein: The mold size in step (4) is 35*35*35cm 3 ; The curing and molding conditions are natural curing at 25°C for 24 hours.

9. A ternary mixed gelling material obtained by the preparation method according to any one of claims 1 to 8.

10. Use of the ternary mixed cementitious material according to claim 9 in the field of building material filling and construction engineering.

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