A high-iron red mud-based ferrite-aluminate cement and a method of making the same

Abstract

This invention belongs to the field of solid waste recycling technology, specifically relating to a high-iron red mud-based ferroaluminate cement and its preparation method. The cement comprises the following raw materials in parts by weight: 100 parts high-iron red mud-based ferroaluminate cement clinker, 10-20 parts setting regulator compound, 5-20 parts mineral admixtures, 0.5-2 parts nucleating agent, 1-3 parts full-thiol cyclodextrin compound, and 1.5-3 parts carboxylated chitosan; the high-iron red mud-based ferroaluminate cement clinker raw materials include high-iron red mud, calcareous solid waste, siliceous aluminate solid waste, sulfate solid waste, and aluminous corrective agent; the mineral composition includes 29-45 wt% C4A3, 20-30 wt% C2S, and 18-35 wt% C4AF. Nucleating agents provide nucleation sites, accelerate the early precipitation of gel and ettringite, and compensate for the early strength reduction caused by impurities; fully mercaptocyclodextrin compounds prevent crystal distortion and later strength reduction caused by crystal transformation; carboxylated chitosan assists in chelation and regulates the crystal growth of hydration products to enhance interfacial bonding; the three work together to solve the problems of low early strength and later strength reduction caused by iron ions and other impurities in high-iron red mud.

Description

Technical Field

[0001] This invention belongs to the field of solid waste recycling technology, specifically relating to a high-speed iron red mud-based ferroaluminate cement and its preparation method. Background Technology

[0002] Sulfoaluminate cement, ferroaluminate cement, and other cement varieties derived from them are collectively referred to as Series 3 cement. The chemical composition of Series 3 cement clinker belongs to the CaO-SiO2-Al2O3-Fe2O3-SO3 five-element system, with C4A3 as the main mineral component. C2S and C4AF. The main difference in chemical composition between sulfoaluminate and ferroaluminate cements lies in the w(C4A3) content in the cement clinker. The content of C4A3 mineral phases, w(C2S) and w(C4AF) differs. Series 3 cement is based on C4A3. Various sulfoaluminate cements, primarily composed of minerals, are characterized by early strength, high strength, high impermeability, high frost resistance, corrosion resistance, low alkali content, and low energy consumption during production. Cement clinker typically uses three raw materials: limestone, bauxite (iron bauxite or alumina), and gypsum (natural anhydrite or dihydrate gypsum). Solid waste containing the corresponding components can also be used as substitutes. To achieve energy conservation, emission reduction, and cost reduction, research and application of using solid waste to replace some raw materials in the preparation of Series 3 cements are currently being widely carried out.

[0003] For example, patent CN108328950B discloses a method for preparing aluminoferrite cement by co-processing red mud with other solid wastes. The method involves thoroughly mixing red mud with iron ore tailings, carbide slag, desulfurization gypsum, and corrective solid waste materials. The composition of the mixture is tested and corrected using the corrective materials to ensure that the mass of CaO in the calcined raw meal is 36-45%, SiO2 is 12-20%, Al2O3 is 14-25%, and Fe2O3 is 15-30%. The basicity coefficient of the calcined raw meal is between 0.9 and 1.1, the Si / Al ratio is 2-3, and the Al / Fe ratio is 2.5-3. The prepared raw meal is then sprayed into a rotary kiln and calcined to obtain aluminoferrite cement. Patent CN110698091B discloses a lightweight thermal insulation wall material based on industrial solid waste and its preparation method. The wall material consists of solid raw materials and water. The solid raw materials consist of industrial solid waste-based aluminate cement, recycled materials, foaming agent, aggregate, air-entraining agent, and reinforcing materials. The raw materials for the industrial solid waste-based aluminate cement consist of red mud, steel slag, blast furnace slag, desulfurized gypsum, silica fume, and aluminum ash. The preparation method is as follows: red mud, steel slag, blast furnace slag, desulfurized gypsum, silica fume, and aluminum ash are sequentially ground, homogenized, calcined, and ground into clinker to obtain industrial solid waste-based aluminate cement. The industrial solid waste-based aluminate cement is then mixed with recycled materials, water, foaming agent, aggregate, air-entraining agent, and reinforcing materials to form foam.

[0004] The above describes a technology for preparing aluminoferrite cement using solid waste as a substitute for natural components. This technology offers fundamental advantages such as resource utilization of red mud and other solid wastes, reduced production costs, reduced carbon emissions, and the ability to achieve early strength and low energy consumption, similar to third-series cements. However, aluminoferrite cement itself has inherent limitations due to the presence of C4A3... The high mineral content already presents a problem of reduced strength in later stages due to the transformation of ettringite crystals. Using solid waste resources such as red mud, especially high-iron red mud which accounts for a larger proportion of industrial production, to prepare ferroaluminate cement will not only exacerbate this problem but also lead to a decrease in early strength. The excessive iron ions in high-iron red mud solid waste interfere with the cement hydration process; on the one hand, iron ions easily replace Al in the ettringite (AFt) lattice. 3+ This leads to crystal structure distortion, accelerating its transformation into monosulfide-type hydrated calcium sulfoaluminate (AFm), further exacerbating the later strength reduction. On the other hand, high-iron will form an iron-containing phase without cementing activity. The iron-containing phase and other impurities will hinder the stable growth of hydration products such as CSH gel and ettringite, resulting in a loose structure of hydration products and a significant reduction in the early strength of cement. This seriously limits the high-value utilization of high-impurity solid waste such as high-iron red mud and also restricts the engineering promotion of this technology.

[0005] Therefore, it is necessary to develop a high-iron red mud-based ferroaluminate cement that can retain the inherent advantages of early strength and low energy consumption of ferroaluminate cement, realize the efficient utilization of solid waste such as high-iron red mud, effectively suppress the AFt crystallization phenomenon caused by high-iron and other impurities, solve the problems of early strength reduction and later strength shrinkage, and take into account both the utilization of solid waste resources and the long-term strength stability of cement. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a high-speed iron red mud-based aluminoferrite cement and its preparation method. The high-speed iron red mud-based aluminoferrite cement comprises a nucleating agent, a fully mercaptocyclodextrin compound, and carboxylated chitosan. The nucleating agent provides additional nucleation sites for the hydration products, accelerating the early precipitation of C-(A)-SH gel and ettringite (AFt), compensating for the early strength reduction caused by impurities. The fully mercaptocyclodextrin compound chelates iron ions, inhibiting their entry into the AFt lattice, thus stabilizing the ettringite structure, preventing crystal distortion and later strength reduction caused by its transformation to AFm, and reducing the formation of low- or non-cementing iron-containing phases. The carboxylated chitosan, through carboxyl-assisted chelation and utilizing its special structure, forms a strong interaction with the hydration products and other raw material particles, regulating the crystal growth of the hydration products, enhancing interfacial bonding, reducing the interference of impurities on the hydration process, and improving structural density. The three work together to fundamentally solve the problems of interference from iron ions and other impurities, distortion of hydration products, loose structure, low early strength and shrinkage of later strength in high-iron red mud, and realize the high-value utilization of high-impurity solid waste such as high-iron red mud.

[0007] To achieve the above objectives, the following technical solution is adopted:

[0008] A high-speed iron red mud-based ferroaluminate cement comprises the following raw materials in parts by weight: 100 parts high-speed iron red mud-based ferroaluminate cement clinker, 10-20 parts setting regulator compound, 5-20 parts mineral admixture, 0.5-2 parts nucleating agent, 1-3 parts full-mercaptocyclodextrin compound, and 1.5-3 parts carboxylated chitosan; the raw materials for preparing the high-speed iron red mud-based ferroaluminate cement clinker include high-speed iron red mud, calcareous solid waste, siliceous aluminous solid waste, sulfate solid waste, and aluminous corrective agent; the mineral composition of the high-speed iron red mud-based ferroaluminate cement clinker is mainly anhydrous calcium sulfoaluminate 3CaO·3Al2O3·CaSO4 (abbreviated C4A3). The main components are dicalcium silicate (C2S) and iron-phase solid solution (C4AF), including 29-45 wt% C4A3. , 20-30wt%C2S, 18-35wt%C4AF.

[0009] The perthiol cyclodextrin compound is selected from at least one of perthiol alpha cyclodextrin, perthiol beta cyclodextrin, and perthiol gamma cyclodextrin.

[0010] The degree of carboxylation of the carboxylated chitosan is 60-90%, preferably 60-80%.

[0011] The nucleating agent is selected from at least one of nano-calcium carbonate and nano-silica. The average particle size of the nucleating agent is 30-60 nm.

[0012] The mass ratio of the high-iron red mud, calcareous solid waste, siliceous aluminum solid waste, sulfate solid waste, and aluminum corrective material is 15-25:30-46:5-10:28-30:10-15. The raw materials of the high-iron red mud-based ferroaluminate cement clinker meet the following requirements: alkalinity coefficient of 0.80-1.20, aluminum-silicon ratio of 1.5-3.0, and aluminum-sulfur ratio of 1.5-3.5.

[0013] The chemical composition of the high-speed iron red mud-based ferroaluminate cement clinker includes: 38-48wt% CaO, 18-24wt% Al2O3, 6-10wt% SiO2, 8.5-23.5wt% Fe2O3, 7.5-8.5wt% SO3, 1.1-2.4wt% TiO2, and 0.1-1.4wt% Na2O.

[0014] The high-iron red mud comprises 1-5 wt% CaO, 6-10 wt% SiO2, 15-30 wt% Al2O3, 30-60 wt% Fe2O3, 0.1-0.3 wt% SO3, 0.1-0.5 wt% MgO, 5-8 wt% TiO2, and 1-5 wt% Na2O, with a specific surface area of ​​500-800 m². 2 / kg, with a particle size D50 of 3-20μm.

[0015] The high-speed iron red mud is a solid waste generated from the Bayer process for alumina production.

[0016] The calcareous solid waste has a CaO content of 60-90 wt% and a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm. The calcium-based solid waste is selected from at least one of carbide slag, steel slag, and alkaline slag.

[0017] The silicoaluminous solid waste contains 5-10 wt% CaO, 25-55 wt% SiO2, 30-50 wt% Al2O3, 1-5 wt% Fe2O3, and 1-5 wt% SO3, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm. The silica-alumina solid waste is selected from at least one of fly ash, blast furnace slag, and coal gangue.

[0018] The sulfate solid waste contains 23-52 wt% CaO, 1-3 wt% SiO2, 1-2 wt% Al2O3, and 27-56 wt% SO3, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm. The sulfate solid waste is selected from at least one of desulfurized gypsum, desulfurized ash, phosphogypsum, and titanium gypsum.

[0019] The aluminum corrective material comprises 1-3 wt% CaO, 5-12 wt% SiO2, 65-85 wt% Al2O3, 3-10 wt% Fe2O3, and 2-5 wt% TiO2, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm. The aluminum corrective material is selected from at least one of bauxite, aluminum ash, and high-alumina fly ash.

[0020] The high-speed iron red mud-based ferroaluminate cement clinker is prepared by a method including the following steps:

[0021] High-speed iron red mud, calcareous solid waste, silica-alumina solid waste, sulfate solid waste, and alumina corrective material are mixed, calcined, cooled, crushed, and ground to obtain high-speed iron red mud-based ferroaluminate cement clinker.

[0022] The calcination temperature is 1200-1400℃, and the calcination time is 30-90 minutes. The crushing is performed using a jaw crusher to achieve an average particle size of 1-5 mm. The grinding is performed using a vertical mill or ball mill to achieve a specific surface area of ​​350-500 m². 2 / kg, preferably 380-450 m 2 / kg, D50 is 5-15μm.

[0023] The mineral admixture is selected from at least one of blast furnace ore powder and fly ash.

[0024] The blast furnace ore powder is selected from at least one of the S95, S75, and S105 grade slag powders.

[0025] The fly ash is selected from at least one of grade I fly ash, grade II fly ash, and grade III fly ash.

[0026] The setting compound is selected from at least one of natural gypsum, desulfurized gypsum, and phosphogypsum.

[0027] This invention also provides a method for preparing high-iron red mud-based ferroaluminate cement, comprising the following steps:

[0028] High-speed iron red mud-based ferroaluminate cement is obtained by mixing clinker, setting regulator, mineral admixture, nucleating agent, fully mercaptocyclodextrin compound, and carboxylated chitosan.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] I. The high-speed iron red mud-based aluminoferrite cement of the present invention comprises a nucleating agent, a fully mercaptocyclodextrin compound, and carboxylated chitosan. The nucleating agent provides additional nucleation sites for hydration products, accelerates the early precipitation of C-(A)-SH gel and ettringite (AFt), and compensates for the early strength reduction caused by impurities. The fully mercaptocyclodextrin compound inhibits the entry of iron ions into the AFt lattice by chelating iron ions, which stabilizes the ettringite structure, prevents crystal distortion and later strength reduction caused by its transformation to AFm, and reduces the formation of iron-containing phases with low or no cementitious activity. The carboxylated chitosan regulates the crystal growth of hydration products by using carboxyl-assisted chelation and its special structure to form a strong interaction with the surface of hydration products and other raw material particles, enhances interfacial bonding, reduces the interference of impurities on the hydration process, and improves the structural density. The three work together to fundamentally solve the problems of interference from iron ions and other impurities, distortion of hydration products, loose structure, low early strength and shrinkage of later strength in high-iron red mud, and realize the high-value utilization of high-impurity solid waste such as high-iron red mud.

[0031] Second, the high-speed iron red mud-based ferroaluminate cement raw material of this invention uses more industrial solid waste, which reduces production costs, significantly reduces the proportion of limestone used, and reduces carbon dioxide emissions in clinker production; the obtained cement has high early strength and no shrinkage after hardening. Attached Figure Description

[0032] Figure 1 XRD of high-speed iron red mud-based ferroaluminate cement clinker in Example 1;

[0033] Figure 2 This is a SEM image of the high-speed iron red mud-based ferroaluminate cement clinker from Example 1. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments, but is not limited to the contents of the specification. Unless otherwise specified, all "parts" mentioned in the embodiments of the present invention are parts by weight. All reagents used are commercially available in the art.

[0035] The No. 1 red mud from the high-speed railway is a solid waste product from the Bayer process for alumina production, originating from Hebei Wenfeng Industrial Group Co., Ltd. It contains 4.2 wt% CaO, 9.5 wt% SiO2, 28.3 wt% Al2O3, 32.1 wt% Fe2O3, 0.18 wt% SO3, 0.45 wt% MgO, 7.5 wt% TiO2, and 4.2 wt% Na2O, with a specific surface area of ​​620 m². 2 / kg, with a particle size D50 of 8.5μm.

[0036] High-speed rail red mud #2 is solid waste from the Bayer process for alumina production, originating from Hebei Wenfeng Industrial Group Co., Ltd. It contains 3.7 wt% CaO, 8.9 wt% SiO2, 19.2 wt% Al2O3, 58.3 wt% Fe2O3, 0.22 wt% SO3, 0.42 wt% MgO, 6.8 wt% TiO2, and 1.5 wt% Na2O, with a specific surface area of ​​710 m². 2 / kg, with a particle size D50 of 5.5μm.

[0037] The calcium-rich solid waste is carbide slag, sourced from Hebei Wenfeng Industrial Group Co., Ltd., containing 72.5 wt% CaO and a specific surface area of ​​520 m². 2 / kg, with a particle size D50 of 15μm.

[0038] The silicoaluminous solid waste is circulating fluidized bed fly ash from Hebei Wenfeng Industrial Group Co., Ltd., comprising 6.8wt% CaO, 38.5wt% SiO2, 42.3wt% Al2O3, 2.6wt% Fe2O3, and 2.2wt% SO3, with a specific surface area of ​​540 m². 2 / kg, with a particle size D50 of 22μm.

[0039] The sulfate-based solid waste, desulfurization ash, originated from Hebei Wenfeng Industrial Group Co., Ltd., and consists of 41.2 wt% CaO, 1.8 wt% SiO2, 1.2 wt% Al2O3, and 48.5 wt% SO3, with a specific surface area of ​​470 m². 2 / kg, with a particle size D50 of 18μm.

[0040] The aluminum corrective material is bauxite from Henan Borun New Materials Co., Ltd., comprising 1.5wt% CaO, 9.3wt% SiO2, 72.8wt% Al2O3, 5.6wt% Fe2O3, and 3.2wt% TiO2, with a specific surface area of ​​530 m². 2 / kg, with a particle size D50 of 16μm.

[0041] Carboxylated chitosan with a carboxylation degree of 80% and carboxylated chitosan with a carboxylation degree of 90% both come from Jinan Xinzhiyuan Biotechnology Co., Ltd.

[0042] The carboxylated chitosan has a carboxylation degree of 60% and is sourced from Wuhan Pushida Biotechnology Co., Ltd.

[0043] Both the fully thiol alpha cyclodextrin and the fully thiol beta cyclodextrin are from Shanghai Amore Biotechnology Co., Ltd.

[0044] The nano-calcium carbonate has an average particle size of 30nm and 60nm and comes from Ningbo Luofei Nanotechnology Co., Ltd.

[0045] Example 1

[0046] 1) Mix high-speed iron red mud No. 1, carbide slag, circulating fluidized bed fly ash, desulfurization ash, and bauxite in a mass ratio of 15:37:5:28:15, calcine at 1300℃ for 30 minutes, cool to room temperature, crush with a jaw crusher to an average particle size of 1.7 mm, and then grind with a ball mill until the specific surface area reaches 433 m². 2 / kg, D50 is 6.2μm, thus obtaining high-speed iron red mud based ferroaluminate cement clinker; basicity coefficient is 1.18, aluminum-silicon ratio is 2.51, and aluminum-sulfur ratio is 1.89.

[0047] 2) Mix 100 parts of high-speed iron red mud-based ferroaluminate cement clinker, 20 parts of desulfurized gypsum, 5 parts of grade I fly ash, 2 parts of 30nm nano calcium carbonate, 3 parts of fully mercapto-alpha cyclodextrin, and 3 parts of carboxylated chitosan with a carboxylation degree of 80% to obtain high-speed iron red mud-based ferroaluminate cement.

[0048] Example 2

[0049] The rest is the same as in Example 1, except that in step 1), the mass ratio of high-speed iron red mud 1#, carbide slag, circulating fluidized bed fly ash, desulfurization ash and bauxite is 25:30:5:30:10; the alkalinity coefficient is 1.02, the aluminum-silicon ratio is 1.77 and the aluminum-sulfur ratio is 1.73.

[0050] Example 3

[0051] The rest is the same as in Example 1, except that in step 2), the full-thiol alpha-cyclodextrin is replaced with an equal mass of full-thiol beta-cyclodextrin.

[0052] Example 4

[0053] The rest is the same as in Example 1, except that in step 2), the amount of full-thiol alpha cyclodextrin used is 1 part.

[0054] Example 5

[0055] The rest is the same as in Example 1, except that in step 2), carboxylated chitosan with a carboxylation degree of 60% is replaced with an equal mass of carboxylated chitosan with a carboxylation degree of 80%.

[0056] Example 6

[0057] The rest is the same as in Example 1, except that in step 2), carboxylated chitosan with a carboxylation degree of 90% is replaced with an equal mass of carboxylated chitosan with a carboxylation degree of 80%.

[0058] Example 7

[0059] The rest is the same as in Example 1, except that in step 2), the amount of carboxylated chitosan with a carboxylation degree of 90% is 1.5 parts by mass.

[0060] Example 8

[0061] 1) Mix high-speed iron red mud No. 2, carbide slag, circulating fluidized bed fly ash, desulfurization ash, and bauxite in a mass ratio of 25:30:10:30:10, calcine at 1300℃ for 30 minutes, cool to room temperature, crush with a jaw crusher to an average particle size of 1.5 mm, and then grind with a ball mill until the specific surface area reaches 450 m². 2 / kg, D50 is 5.2μm, thus obtaining high-speed iron red mud-based ferroaluminate cement clinker; alkalinity coefficient is 0.92, aluminum-silicon ratio is 1.52, and aluminum-sulfur ratio is 1.74.

[0062] 2) Mix 100 parts of high-speed iron red mud-based ferroaluminate cement clinker, 10 parts of desulfurized gypsum, 20 parts of grade I fly ash, 0.5 parts of 60nm nano calcium carbonate, 3 parts of fully mercapto-alpha cyclodextrin, and 3 parts of carboxylated chitosan with a carboxylation degree of 90% to obtain high-speed iron red mud-based ferroaluminate cement.

[0063] Comparative Example 1

[0064] The rest is the same as in Example 1, except that in step 2), the fully mercapto alpha cyclodextrin is replaced with alpha cyclodextrin.

[0065] Comparative Example 2

[0066] The rest is the same as in Example 1, except that in step 2), the 80% degree of carboxylation of carboxylated chitosan is replaced with 80% degree of substitution of hydroxypropyl chitosan (from Maclean).

[0067] Comparative Example 3

[0068] The rest is the same as in Example 1, except that in step 2), no nano-calcium carbonate is added.

[0069] The substances prepared in the above examples and comparative examples were subjected to the following performance tests:

[0070] 1. XRD Analysis: XRD refinement and quantitative analysis were performed on the clinker prepared in the examples and comparative examples. A Shimadzu XRD-7000 XRD diffractometer (Japan) was used for XRD analysis of the samples, and GSAS-II software was used for quantitative phase analysis. The C4A3 values ​​were recorded. Content of C2S and C4AF.

[0071] 2. Compressive strength: The strength of the high-speed iron red mud-based ferroaluminate cement was tested in accordance with section 8.2.3.2 of standard GB / T 45920-2025 ferroaluminate cement.

[0072] Table 1 Performance Test Results

[0073]

[0074] As shown in Table 1, the high-iron red mud-based aluminoferrate cement prepared by this invention has the characteristics of high early strength and no shrinkage after hardening. The 1-day strength is 31.9-38.5 MPa, the 3-day strength is 40.3-46.0 MPa, the 28-day strength is 48.7-56.0 MPa, and the 90-day strength is 55.4-64.1 MPa. The compressive strength test results of Example 1 and Comparative Examples 1-3 clearly show that the nucleating agent, the fully mercaptocyclodextrin compound, and the carboxylated chitosan have a significant synergistic effect in improving the problems of low early strength and shrinkage in later stages of cement.

[0075] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included within the scope of the technical solution of the present invention.

Claims

1. A high-speed iron red mud-based ferroaluminate cement, characterized in that, The raw materials include the following parts by weight: 100 parts of high-iron red mud-based ferroaluminate cement clinker, 10-20 parts of setting regulator compound, 5-20 parts of mineral admixture, 0.5-2 parts of nucleating agent, 1-3 parts of full-thiol cyclodextrin compound, and 1.5-3 parts of carboxylated chitosan. The raw materials for preparing the high-iron red mud-based ferroaluminate cement clinker include high-iron red mud, calcareous solid waste, siliceous aluminate solid waste, sulfate solid waste, and aluminous corrective agent. The mineral composition of the high-iron red mud-based ferroaluminate cement clinker includes 29-45 wt% C4A3. , 20-30wt%C2S, 18-35wt%C4AF.

2. The high-speed iron red mud-based ferroaluminate cement according to claim 1, characterized in that, The fully thiol cyclodextrin compound is selected from at least one of fully thiol alpha cyclodextrin, fully thiol beta cyclodextrin, and fully thiol gamma cyclodextrin; the carboxylated chitosan has a carboxylation degree of 60-90%, preferably 60-80%; the nucleating agent is selected from at least one of nano-calcium carbonate and nano-silica; and the average particle size of the nucleating agent is 30-60 nm.

3. The high-speed iron red mud-based ferroaluminate cement according to claim 1, characterized in that, The mass ratio of the high-iron red mud, calcareous solid waste, siliceous aluminum solid waste, sulfate solid waste, and aluminum corrective material is 15-25:30-46:5-10:28-30:10-15; the raw materials of the high-iron red mud-based ferroaluminate cement clinker meet the following requirements: alkalinity coefficient of 0.80-1.20, aluminum-silicon ratio of 1.5-3.0, and aluminum-sulfur ratio of 1.5-3.5; the chemical composition of the high-iron red mud-based ferroaluminate cement clinker includes: 38-48wt% CaO, 18-24wt% Al2O3, 6-10wt% SiO2, 8.5-23.5wt% Fe2O3, 7.5-8.5wt% SO3, 1.1-2.4wt% TiO2, and 0.1-1.4wt% Na2O.

4. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The high-iron red mud comprises 1-5 wt% CaO, 6-10 wt% SiO2, 15-30 wt% Al2O3, 30-60 wt% Fe2O3, 0.1-0.3 wt% SO3, 0.1-0.5 wt% MgO, 5-8 wt% TiO2, and 1-5 wt% Na2O, with a specific surface area of ​​500-800 m². 2 / kg, with a particle size D50 of 3-20μm; the high-iron red mud is a solid waste generated from the Bayer process for alumina production.

5. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The calcareous solid waste has a CaO content of 60-90 wt% and a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm; the calcium solid waste is selected from at least one of carbide slag, steel slag, and alkali slag.

6. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The silicoaluminous solid waste contains 5-10 wt% CaO, 25-55 wt% SiO2, 30-50 wt% Al2O3, 1-5 wt% Fe2O3, and 1-5 wt% SO3, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm; the silicon-aluminate solid waste is selected from at least one of fly ash, blast furnace slag, and coal gangue.

7. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The sulfate solid waste contains 23-52 wt% CaO, 1-3 wt% SiO2, 1-2 wt% Al2O3, and 27-56 wt% SO3, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm; the sulfate solid waste is selected from at least one of desulfurized gypsum, desulfurized ash, phosphogypsum, and titanium gypsum.

8. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The aluminum corrective material comprises 1-3 wt% CaO, 5-12 wt% SiO2, 65-85 wt% Al2O3, 3-10 wt% Fe2O3, and 2-5 wt% TiO2, with a specific surface area of ​​400-600 m². 2 / kg, with a particle size D50 of 8-30μm; the aluminum correcting material is selected from at least one of bauxite, aluminum ash, and high-alumina fly ash.

9. The high-speed iron red mud-based ferroaluminate cement according to claim 3, characterized in that, The high-speed iron red mud-based ferroaluminate cement clinker is prepared by a method including the following steps: High-speed iron red mud, calcareous solid waste, silica-alumina solid waste, sulfate solid waste, and alumina corrective material are mixed, calcined, cooled, crushed, and ground to obtain high-speed iron red mud-based ferroaluminate cement clinker.

10. The method for preparing high-speed iron red mud-based ferroaluminate cement according to any one of claims 1-9, characterized in that, Includes the following steps: High-speed iron red mud-based ferroaluminate cement is obtained by mixing clinker, setting regulator, mineral admixture, nucleating agent, fully mercaptocyclodextrin compound, and carboxylated chitosan.

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