A solid waste-based ferrite-aluminate cement and a preparation method thereof

Abstract

This invention discloses a solid waste-based aluminoferrite cement and its preparation method, belonging to the field of low-carbon cement technology. It comprises 35-42 parts of carbide slag, 20-28 parts of fly ash, 10-16 parts of converter steel slag, 8-12 parts of desulfurized gypsum, 6-10 parts of red mud powder, 3-5 parts of yellow phosphorus slag, 1-3 parts of calcite powder, 1-2 parts of natural clinoptilolite powder, and 0.5-1 part of mirabilite powder. This invention uses various industrial solid wastes such as carbide slag, fly ash, converter steel slag, desulfurized gypsum, red mud powder, and yellow phosphorus slag as core raw materials, significantly replacing natural mineral resources, effectively utilizing large-scale industrial solid waste inventories, reducing resource idleness and waste; achieving full life-cycle recycling of raw materials, reducing solid waste emission pressure, aligning with the requirements of green, low-carbon, and resource-recycling industrial development, and contributing to the sustainable development of the cement industry.

Description

Technical Field

[0001] This invention relates to the field of low-carbon cement technology, specifically to a solid waste-based ferroaluminate cement and its preparation method. Background Technology

[0002] Ferroaluminate cement possesses excellent properties such as early strength, rapid hardening, and corrosion resistance, making it irreplaceable in special engineering construction fields such as emergency repair and construction, marine engineering, saline-alkali environment engineering, and low-temperature construction engineering. However, at present, high-quality bauxite resources are becoming increasingly scarce, and the grade of ore continues to decline, directly leading to a continuous increase in the procurement cost of core raw materials.

[0003] Traditional aluminoferrite cement formulations have long relied on natural minerals as the core, lacking mature, low-cost alternative raw material technologies. Existing technologies have failed to effectively tap the potential utilization value of large quantities of industrial solid waste, and cannot effectively reduce raw material costs by replacing natural mineral raw materials with industrial solid waste. This situation not only results in a large amount of idle and wasted industrial solid waste resources, but also contradicts the current requirements for green, low-carbon, and resource-recycling industrial development.

[0004] Based on this, the present invention designs a solid waste-based ferroaluminate cement and its preparation method to solve the above problems. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a method for preparing solid waste-based aluminoferrite cement, comprising the following steps:

[0006] S1: By weight, weigh 35-42 parts of carbide slag, 20-28 parts of fly ash, 10-16 parts of converter steel slag, 8-12 parts of desulfurization gypsum, 6-10 parts of red mud powder, 3-5 parts of yellow phosphorus slag, 1-3 parts of calcite powder; 1-2 parts of natural clinoptilolite powder, and 0.5-1 part of mirabilite powder;

[0007] S2: Grind converter steel slag and grinding aid A to obtain steel slag pretreated material; grind red mud powder with yellow phosphorus slag and grinding aid B to obtain mixture A; grind desulfurized gypsum, natural clinoptilolite powder, mirabilite powder and grinding aid C to obtain mixture B; co-grind mixture A and mixture B to obtain premix;

[0008] S3: Mix carbide slag, steel slag pretreated material, and calcite powder to obtain dry mix B; homogenize the premix and dry mix B to obtain raw meal powder, and collect the dust for later use;

[0009] S4: The raw meal powder is fed into the first-stage preheating cylinder and held at 250-300℃ for 8-10 seconds to remove free water from the surface of the raw meal powder; then it enters the second-stage preheating cylinder and holds at 400-500℃ for 6-8 seconds; then it enters the third-stage preheating cylinder and holds at 600-700℃ for 6-8 seconds to remove bound water from the raw meal powder and volatilize some low-boiling-point impurities; finally, it enters the fourth-stage preheating cylinder and holds at 750-880℃ for 5-6 seconds;

[0010] S5: The preheated raw meal powder is calcined in stages. First, the temperature is raised to 900-1100℃; then it is raised to 1250-1290℃; after calcination, the temperature is lowered to 1080-1120℃; then it is lowered again to obtain solid waste-based aluminoferrite cement clinker.

[0011] S6: Use the dust collected in S3 as recycled material; mix and grind the solid waste-based aluminate cement clinker obtained in S5, desulfurized gypsum and fly ash, add the recycled material and continue grinding to obtain solid waste-based aluminate cement.

[0012] Furthermore, S2 specifically involves: grinding converter steel slag and grinding aid A to obtain steel slag pretreated material; mixing red mud powder with yellow phosphorus slag and grinding aid B, and grinding to obtain mixture A; mixing natural clinoptilolite powder, mirabilite powder and grinding aid C, and grinding to obtain mixture B; and mixing and grinding mixture A and mixture B to obtain premix.

[0013] Furthermore, the grinding aid A accounts for 0.3-0.8% of the mass of the converter steel slag, and the grinding aid A is composed of triethanolamine, calcium sugar and nano-silica in a mass ratio of 4.5-5.0:5-8:3-5.

[0014] Furthermore, the grinding aid B accounts for 0.5-1.1% of the total mass of red mud and yellow phosphorus slag, and the grinding aid B is composed of triethanolamine, calcium sugar and nano silica in a mass ratio of 1.2-1.8:40-48:8-12.

[0015] Furthermore, the grinding aid C accounts for 0.4-0.7% of the total mass of natural clinoptilolite powder and sodium sulfate powder, and the grinding aid C is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.8-2.2:25-32:12-18.

[0016] Furthermore, S3 specifically involves: mixing carbide slag, pretreated steel slag, and calcite powder to obtain dry mix B; feeding the premix and dry mix B into a homogenization silo and homogenizing them by air for 15-20 minutes to obtain raw meal powder, and collecting the dust for later use.

[0017] Furthermore, S5 specifically involves: feeding the preheated raw meal powder into a rotary kiln, first heating it to 900-1100℃ at a rate of 8-10℃ / min; then heating it to 1250-1290℃ at a rate of 3-4℃ / min, holding it at that temperature for 15-20min, and after calcination, first cooling it to 1080-1120℃ at a rate of 18-22℃ / min, and then cooling it to ≤70℃ at a rate of 5-8℃ / min to obtain solid waste-based aluminoferrite cement clinker.

[0018] Furthermore, S6 specifically involves: using the dust collected in S3 as recycled material; mixing and grinding the solid waste-based aluminate cement clinker obtained in S5, desulfurized gypsum, and fly ash; adding the recycled material after grinding for 15-20 minutes; and continuing to grind for another 15-20 minutes to obtain solid waste-based aluminate cement.

[0019] A solid waste-based aluminoferrate cement prepared according to any one of the methods described.

[0020] Compared with the prior art, the beneficial effects of this invention are as follows:

[0021] 1. This invention uses a variety of industrial solid wastes, such as carbide slag, fly ash, converter steel slag, desulfurization gypsum, red mud powder, and yellow phosphorus slag, as core raw materials, which can significantly replace natural mineral resources, effectively digest the inventory of bulk industrial solid waste, and reduce resource idleness and waste; it realizes the full life cycle recycling of raw materials, reduces the pressure of solid waste emission, meets the requirements of green, low-carbon and resource recycling industrial development, and helps the sustainable development of the cement industry.

[0022] 2. This invention, through the targeted and adapted grinding aid, fully activates the active components of various solid waste raw materials. Combined with suspension preheating, segmented calcination, and gradient cooling processes, it ensures the full formation and development of the aluminoferrite core mineral phase, resulting in a reasonable cement setting time (initial setting 58-63 min, final setting 119-125 min) and good workability. The 24-hour compressive strength reaches 47.8-48.7 MPa, and the flexural strength reaches 7.2-7.5 MPa, which can quickly meet the early strength requirements of engineering projects. The long-term strength is stable, with a 28-day compressive strength of 60.9-61.6 MPa and a flexural strength of 11.0-11.3 MPa, demonstrating excellent mechanical properties. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] The main components of the solid waste involved in this invention are shown in Table 1;

[0025] Table 1:

[0026]

[0027] Example 1: This example provides a method for preparing solid waste-based aluminoferrate cement, including the following steps:

[0028] S1: By weight, weigh 35 parts of carbide slag, 20 parts of fly ash, 10 parts of converter steel slag, 8 parts of desulfurization gypsum, 6 parts of red mud powder, 3 parts of yellow phosphorus slag, 1 part of calcite powder, 1 part of natural clinoptilolite powder, and 0.5 parts of mirabilite powder.

[0029] S2: Grind converter steel slag and grinding aid A to obtain steel slag pretreated material; mix red mud powder with yellow phosphorus slag and grinding aid B, and grind to obtain mixture A (vertical mill to 0.080mm square hole sieve residue ≤7.0%, the same below); mix natural clinoptilolite powder, mirabilite powder and grinding aid C, and grind to obtain mixture B (vertical mill to 0.080mm square hole sieve residue ≤7.0%, the same below); mix mixture A and mixture B, and grind to obtain premix (vertical mill to 0.080mm square hole sieve residue ≤7.0%, the same below);

[0030] The grinding aid A accounts for 0.3% of the mass of converter steel slag, and the grinding aid A is composed of triethanolamine, calcium sugar and nano-silica in a mass ratio of 4.5:5:3.

[0031] The grinding aid B accounts for 0.5% of the total mass of red mud and yellow phosphorus slag. Grinding aid B is composed of triethanolamine, calcium sugar and nano-silica in a mass ratio of 1.2:40:8.

[0032] The grinding aid C accounts for 0.4% of the total mass of natural clinoptilolite powder and sodium sulfate powder. The grinding aid C is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.8:25:12.

[0033] S3: Mix carbide slag, steel slag pretreated material, and calcite powder to obtain dry mix B; put the premix and dry mix B into a homogenization silo and homogenize by air for 15-20 minutes to obtain raw meal powder, and collect the dust for later use.

[0034] S4: The raw meal powder is put into the first-stage preheating cylinder and held at 250°C for 8 seconds to remove free water from the surface of the raw meal powder; then it enters the second-stage preheating cylinder and is held at 400°C for 6 seconds, then enters the third-stage preheating cylinder and is held at 600°C for 6 seconds to remove bound water from the raw meal powder and volatilize some low-boiling-point impurities; then it enters the fourth-stage preheating cylinder and is held at 750°C for 5 seconds.

[0035] S5: The preheated raw meal powder is fed into a rotary kiln and heated to 900°C at a rate of 8°C / min; then heated to 1250°C at a rate of 3°C / min and held for 15 min; after calcination, the temperature is cooled to 1120°C at a rate of 18°C / min and then cooled to ≤70°C at a rate of 5°C / min to obtain solid waste-based aluminoferrite cement clinker.

[0036] S6: Use the dust collected in S3 as recycled material;

[0037] The solid waste-based aluminate cement clinker obtained from S5, desulfurized gypsum and fly ash are mixed and ground. Recycled material is added after grinding for 15 minutes, and grinding is continued to obtain solid waste-based aluminate cement (vertical mill to 0.080mm square hole sieve residue ≤7.0%, the same below).

[0038] Example 2: This example provides a method for preparing solid waste-based aluminoferrite cement, including the following steps:

[0039] S1: By weight, weigh 42 parts of carbide slag, 28 parts of fly ash, 16 parts of converter steel slag, 12 parts of desulfurization gypsum, 10 parts of red mud powder, 5 parts of yellow phosphorus slag, 3 parts of calcite powder, 2 parts of natural clinoptilolite powder, and 1 part of mirabilite powder.

[0040] S2: Grind converter steel slag and grinding aid A to obtain steel slag pretreated material; mix red mud powder with yellow phosphorus slag and grinding aid B, and grind to obtain mixture A; mix natural clinoptilolite powder, mirabilite powder and grinding aid C, and grind to obtain mixture B; mix mixture A and mixture B, and grind to obtain premix.

[0041] The grinding aid A accounts for 0.8% of the mass of converter steel slag, and the grinding aid A is composed of triethanolamine, calcium sugar and nano-silica in a mass ratio of 5.0:8:5.

[0042] The grinding aid B accounts for 1.1% of the total mass of red mud and yellow phosphorus slag. Grinding aid B is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.8:48:12.

[0043] The grinding aid C accounts for 0.7% of the total mass of natural clinoptilolite powder and sodium sulfate powder. The grinding aid C is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 2.2:32:18.

[0044] S3: Mix carbide slag, steel slag pretreated material, and calcite powder to obtain dry mix B; put the premix and dry mix B into a homogenization silo and homogenize by air for 20 minutes to obtain raw meal powder, and collect the dust for later use.

[0045] S4: The raw meal powder is put into the first-stage preheating cylinder and held at 300℃ for 10 seconds to remove free water from the surface of the raw meal powder; then it enters the second-stage preheating cylinder and is held at 500℃ for 8 seconds; then it enters the third-stage preheating cylinder and is held at 700℃ for 8 seconds to remove bound water from the raw meal powder and volatilize some low-boiling-point impurities; then it enters the fourth-stage preheating cylinder and is held at 880℃ for 6 seconds.

[0046] S5: The preheated raw meal powder is fed into a rotary kiln and heated to 1100℃ at a rate of 10℃ / min; then heated to 1290℃ at a rate of 4℃ / min and held for 20min; after calcination, the temperature is cooled to 1080℃ at a rate of 22℃ / min and then cooled to ≤70℃ at a rate of 8℃ / min to obtain solid waste-based aluminoferrite cement clinker.

[0047] S6: Use the dust collected in S3 as recycled material;

[0048] Solid waste-based aluminate cement clinker obtained from S5, desulfurized gypsum and fly ash are ground together. Recycled material is added after 20 minutes of grinding, and grinding continues to obtain solid waste-based aluminate cement.

[0049] Example 3: This example provides a method for preparing solid waste-based aluminoferrate cement, including the following steps:

[0050] S1: By weight, weigh 39 parts of carbide slag, 24 parts of fly ash, 13 parts of converter steel slag, 10 parts of desulfurization gypsum, 8 parts of red mud powder, 4.3 parts of yellow phosphorus slag, 2.2 parts of calcite powder, 1.6 parts of natural clinoptilolite powder, and 0.8 parts of mirabilite powder.

[0051] S2: Grind converter steel slag and grinding aid A to obtain steel slag pretreated material; mix red mud powder with yellow phosphorus slag and grinding aid B, and grind to obtain mixture A; mix natural clinoptilolite powder, mirabilite powder and grinding aid C, and grind to obtain mixture B; mix mixture A and mixture B, and grind to obtain premix.

[0052] The grinding aid A accounts for 0.6% of the mass of converter steel slag, and the grinding aid A is composed of triethanolamine, calcium sugar and nano-silica in a mass ratio of 4.8:7:4.

[0053] The grinding aid B accounts for 0.7% of the total mass of red mud and yellow phosphorus slag. Grinding aid B is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.5:44:11.

[0054] The grinding aid C accounts for 0.6% of the total mass of natural clinoptilolite powder and sodium sulfate powder. The grinding aid C is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 2.0:29:16.

[0055] S3: Mix carbide slag, steel slag pretreated material, and calcite powder to obtain dry mix B; put the premix and dry mix B into a homogenization silo and homogenize by air for 17 minutes to obtain raw meal powder, and collect the dust for later use.

[0056] S4: The raw meal powder is put into the first-stage preheating cylinder and held at 280℃ for 8 seconds to remove free water from the surface of the raw meal powder; then it enters the second-stage preheating cylinder and is held at 420℃ for 8 seconds, then enters the third-stage preheating cylinder and is held at 630℃ for 6 seconds to remove bound water from the raw meal powder and volatilize some low-boiling-point impurities; then it enters the fourth-stage preheating cylinder and is held at 870℃ for 6 seconds.

[0057] S5: The preheated raw meal powder is fed into a rotary kiln and heated to 1080℃ at a rate of 10℃ / min; then heated to 1270℃ at a rate of 4℃ / min and held for 18min; after calcination, the temperature is cooled to 1100℃ at a rate of 22℃ / min and then cooled to ≤70℃ at a rate of 7℃ / min to obtain solid waste-based aluminoferrite cement clinker.

[0058] S6: Use the dust collected in S3 as recycled material;

[0059] Solid waste-based aluminate cement clinker obtained from S5, desulfurized gypsum and fly ash are ground together. Recycled material is added after 19 minutes of grinding, and ball milling is continued to obtain solid waste-based aluminate cement.

[0060] Comparative Example 1: The difference between this comparative example and Example 3 is that, in S6, the recycled material was not added to the solid waste-based aluminate cement clinker and fly ash.

[0061] Comparative Example 2: The difference between this comparative example and Example 3 is that in S5, instead of gradient heating and gradient cooling, the raw meal powder was directly fed into the rotary kiln and heated to 1270°C at a rate of 10°C / min. After holding at that temperature for 18 min, the temperature was cooled to ≤70°C at a rate of 22°C / min to obtain solid waste-based aluminoferrite cement clinker.

[0062] Comparative Example 3: The difference between this comparative example and Example 3 is that the grinding aid A and grinding aid B are in the same proportion as grinding aid C, and grinding aid B is in the same proportion as grinding aid A.

[0063] Experimental Example 1: The setting time (min) of the solid waste-based aluminoferrate cement prepared according to the present invention was tested according to GB / T 1346-2024.

[0064] Experimental Example 2: The compressive strength and flexural strength (MPa) of the solid waste-based aluminoferrate cement prepared according to the present invention were tested at 24h, 3d and 28d in accordance with GB / T 17671-2021.

[0065] Experimental Example 3: Following GB / T 50082-2024, the solid waste-based aluminoferrate cement prepared according to this invention, after curing for 28 days, was subjected to 50 freeze-thaw cycles (-20℃). The flexural and compressive strengths were then tested again using the method described in Experimental Example 2. .

[0066] The results are shown in Table 2;

[0067] Table 2

[0068]

[0069] As shown in the table above, the solid waste-based aluminoferrite cement prepared in Examples 1-3 of this invention has an initial setting time of 58-63 min and a final setting time of 119-125 min, which meets the basic requirements for cement setting time and has good workability. The cement from Examples 1-3 exhibits a 24-hour compressive strength of 47.8-48.7 MPa, a 28-day compressive strength of 60.9-61.6 MPa, a 24-hour flexural strength of 7.2-7.5 MPa, and a 28-day flexural strength of 11.0-11.3 MPa. After 50 freeze-thaw cycles, the cement from Examples 1-3 maintains a compressive strength retention rate of ≥96% and a flexural strength retention rate of ≥95%, demonstrating excellent freeze-thaw stability.

[0070] The dust particles collected by S3 are small and have a large specific surface area, exhibiting good activity and filling effect.

[0071] This invention removes residual moisture and volatile impurities from raw materials through preheating; a first-stage calcination (900-1000℃) promotes the formation of intermediate mineral phases; and a second-stage calcination (1250-1290℃) ensures the full formation and development of core mineral phases such as aluminoferrites. In contrast, Comparative Example 2 directly and rapidly heats the material to a high temperature, preventing the full formation and development of core mineral phases such as aluminoferrites. This results in the cement hydration products not forming densely, increasing internal porosity. Under pressure, bending force, and freeze-thaw cycles, stress tends to concentrate at defects, causing significant deterioration in various mechanical properties and freeze-thaw resistance.

[0072] Comparative Example 3 used a uniformly proportioned grinding aid, which could not meet the needs of different raw materials. When dealing with converter steel slag, the insufficient proportion of triethanolamine resulted in poor dispersion; when dealing with red mud and yellow phosphorus slag, the low proportion of sugar and calcium made it difficult to fully activate their potential activity; when dealing with raw materials such as desulfurized gypsum, the unreasonable proportion of nano-silica led to uneven particle distribution after grinding; thus, the compressive strength, flexural strength and freeze-thaw stability of cement decreased significantly.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing solid waste-based ferroaluminate cement, characterized in that, Includes the following steps: S1: By weight, weigh 35-42 parts of carbide slag, 20-28 parts of fly ash, 10-16 parts of converter steel slag, 8-12 parts of desulfurization gypsum, 6-10 parts of red mud powder, 3-5 parts of yellow phosphorus slag, 1-3 parts of calcite powder; 1-2 parts of natural clinoptilolite powder, and 0.5-1 part of mirabilite powder; S2: Grind converter steel slag and grinding aid A to obtain steel slag pretreated material; grind red mud powder with yellow phosphorus slag and grinding aid B to obtain mixture A; grind natural clinoptilolite powder, mirabilite powder and grinding aid C to obtain mixture B; co-grind mixture A and mixture B to obtain premix; S3: Mix carbide slag, steel slag pretreated material, and calcite powder to obtain dry mix B; homogenize the premix and dry mix B to obtain raw meal powder, and collect the dust for later use; S4: Put the raw material powder into the first-stage preheating cylinder and hold it at 250-300℃ for 8-10 seconds, then into the second-stage preheating cylinder and hold it at 400-500℃ for 6-8 seconds, then into the third-stage preheating cylinder and hold it at 600-700℃ for 6-8 seconds, then into the fourth-stage preheating cylinder and hold it at 750-880℃ for 5-6 seconds; S5: The preheated raw meal powder is calcined in stages. First, the temperature is raised to 900-1100℃; then it is raised to 1250-1290℃; after calcination, the temperature is lowered to 1080-1120℃; then it is lowered again to obtain solid waste-based aluminoferrite cement clinker. S6: Use the dust collected in S3 as recycled material; mix and grind the solid waste-based aluminate cement clinker obtained in S5, desulfurized gypsum and fly ash, add the recycled material and continue grinding to obtain solid waste-based aluminate cement.

2. The method for preparing solid waste-based aluminoferrate cement according to claim 1, characterized in that, S2 specifically involves: grinding converter steel slag and grinding aid A to obtain steel slag pretreated material; mixing red mud powder with yellow phosphorus slag and grinding aid B, and grinding to obtain mixture A; mixing natural clinoptilolite powder, mirabilite powder and grinding aid C, and grinding to obtain mixture B; and mixing mixture A and mixture B, and grinding to obtain premix.

3. The method for preparing solid waste-based aluminoferrate cement according to claim 2, characterized in that, The grinding aid A accounts for 0.3-0.8% of the mass of converter steel slag. Grinding aid A is composed of triethanolamine, calcium sugar and nano silica in a mass ratio of 4.5-5.0:5-8:3-5.

4. The method for preparing solid waste-based aluminoferrate cement according to claim 2, characterized in that, The grinding aid B accounts for 0.5-1.1% of the total mass of red mud and yellow phosphorus slag. Grinding aid B is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.2-1.8:40-48:8-12.

5. The method for preparing solid waste-based aluminoferrate cement according to claim 2, characterized in that, The grinding aid C accounts for 0.4-0.7% of the total mass of natural clinoptilolite powder and sodium sulfate powder. The grinding aid C is composed of triethanolamine, calcium glycosides and nano-silica in a mass ratio of 1.8-2.2:25-32:12-18.

6. The method for preparing solid waste-based aluminoferrate cement according to claim 5, characterized in that, S3 specifically involves mixing calcium carbide slag, pretreated steel slag, and calcite powder to obtain dry mix B; then feeding the premix and dry mix B into a homogenization silo and homogenizing them by air for 15-20 minutes to obtain raw meal powder, and collecting the dust for later use.

7. The method for preparing solid waste-based aluminoferrate cement according to claim 6, characterized in that, S5 specifically involves feeding the preheated raw meal powder into a rotary kiln, first heating it to 900-1100℃ at a rate of 8-10℃ / min; then heating it to 1250-1290℃ at a rate of 3-4℃ / min, holding it at that temperature for 15-20min, and after calcination, cooling it to 1080-1120℃ at a rate of 18-22℃ / min, and then cooling it to ≤70℃ at a rate of 5-8℃ / min to obtain solid waste-based aluminoferrite cement clinker.

8. The method for preparing solid waste-based aluminoferrate cement according to claim 7, characterized in that, S6 specifically involves: using the dust collected in S3 as recycled material; mixing and grinding the solid waste-based aluminate cement clinker obtained in S5, desulfurized gypsum, and fly ash; adding the recycled material after grinding for 15-20 minutes; and continuing grinding to obtain solid waste-based aluminate cement.

9. A solid waste-based aluminoferrate cement prepared by the method according to any one of claims 1-8.

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