A high corrosion-resistant all-solid waste-based marine cementitious material, its preparation method and application

Abstract

This invention discloses a highly corrosion-resistant, all-solid-waste-based marine cementitious material, its preparation method, and its application, belonging to the technical field of marine cementitious material preparation. The highly corrosion-resistant, all-solid-waste-based marine cementitious material provided by this invention comprises 40-50 parts of ferric phase precursor cementitious material, 35-45 parts of solid waste-based magnesium phosphate cementitious material, 2-4 parts of water-reducing agent, and 30-50 parts of water. The ferric phase precursor cementitious material is obtained by calcining a mixture of calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste, and iron-based solid waste. The solid waste-based magnesium phosphate cementitious material comprises 15-25 parts of calcium-based solid waste, 35-40 parts of iron-based solid waste, 30-40 parts of overburned magnesium oxide powder, 20-25 parts of potassium dihydrogen phosphate, and 5-8 parts of retarder. The highly corrosion-resistant, all-solid-waste-based marine cementitious material of this invention has the advantages of short setting time, high mechanical strength, strong resistance to solvent corrosion, and low price, possessing considerable economic, engineering, and ecological value.

Description

Technical Field

[0001] This invention relates to the field of marine cementitious material preparation technology, and in particular to a highly corrosion-resistant all-solid waste-based marine cementitious material and its preparation method. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Marine engineering materials face erosion and scouring from seawater during service, making the durability of marine concrete a critical concern. Current technologies address this by using large amounts of sulfoaluminate cement and adding organic admixtures to improve erosion resistance; or by adding double-ash cementitious powder to address the poor abrasion resistance of marine concrete; other technologies use high-ferric phosphate aluminate cement clinker as the main material, adding auxiliary cementitious materials to improve resistance to chloride ion and sulfate attacks; or by adding solid waste to silicate and aluminate cement clinker, using appropriate particle size distribution to improve the overall performance of marine concrete and mitigate corrosion. However, all of these methods rely on cement as the main material, resulting in high costs.

[0004] Currently, some research focuses on the comprehensive utilization of solid waste to achieve its resource recovery. For example, adding a large amount of slag and a small amount of fly ash to silicate cement clinker improves its resistance to seawater erosion; other existing technologies use waste residue as the main raw material, adding fly ash and tailings to prepare materials with economic and environmental benefits. However, the solid waste utilization rate of existing solid waste-based cementitious materials is relatively low, while solid waste-based cementitious materials with higher solid waste utilization rates have poor resistance to seawater erosion. Therefore, how to provide a fully solid waste-based marine cementitious material with high resistance to seawater erosion is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the present invention provides a highly corrosion-resistant all-solid waste-based marine cementitious material, its preparation method and application, which solves the problems of low solid waste utilization rate or poor seawater erosion resistance of existing solid waste-based cementitious materials.

[0006] In a first aspect, the present invention provides a highly corrosion-resistant, all-solid-waste-based marine cementitious material, comprising 40-50 parts of high-iron phase precursor cementitious material, 35-45 parts of solid-waste-based magnesium phosphate cementitious material, 2-4 parts of water-reducing agent and 30-50 parts of water;

[0007] The high-speed iron phase precursor cementitious material is obtained by calcining a mixture of calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste; the limestone saturation coefficient of the mixture is 0.87-0.96, the silicon content is 1.7-2.7 and the aluminum content is 0.9-1.9.

[0008] The solid waste-based magnesium phosphate cement material includes 15-25 parts calcium-based solid waste, 35-40 parts iron-based solid waste, 30-40 parts overburned magnesium oxide powder, 20-25 parts potassium dihydrogen phosphate, and 5-8 parts retarder.

[0009] Preferably, the calcium-based solid waste of the high-iron phase precursor cementitious material and the solid waste-based magnesium phosphate cement material is selected from one or more of carbide slag, blast furnace slag, fly ash, limestone tailings, or shell powder, with a specific surface area of ​​300-450 m². 2 / kg.

[0010] Preferably, the iron-based solid waste of the high-iron phase precursor cementitious material and the solid waste-based magnesium phosphate cement material is selected from one or more of red mud, steel slag, steelmaking dust, or grinding wheel mud, with a specific surface area of ​​300-450 m². 2 / kg.

[0011] Preferably, the silicon-based solid waste is selected from one or more of coal gangue, silica fume, or waste glass, with a specific surface area of ​​300–450 m². 2 / kg.

[0012] Preferably, the aluminum-based solid waste is selected from one or more of aluminum ash, red mud, waste aluminum foil, or aluminum tailings, with a specific surface area of ​​300–450 m². 2 / kg.

[0013] Preferably, the retarder is selected from one or more of borax, malic acid, urea, lignosulfonic acid, or triethanolamine.

[0014] Preferably, the water-reducing agent is selected from one or more of naphthalene-based water-reducing agents, fatty acid water-reducing agents, or aminosulfonate-based water-reducing agents.

[0015] Preferably, the mineral composition of the high-iron phase precursor cementitious material includes 35-40 parts CaO, 20-23 parts SiO2, 20-30 parts Al2O3, and 25-35 parts Fe2O3.

[0016] Secondly, the present invention provides a method for preparing the above-mentioned highly corrosion-resistant all-solid waste-based marine cementitious material, comprising the following steps:

[0017] Calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste are mixed and then calcined to obtain a high-iron phase precursor cementitious material.

[0018] Calcium-based solid waste, iron-based solid waste, overburned magnesium oxide powder, potassium dihydrogen phosphate and retarder are mixed to obtain solid waste-based magnesium phosphate cement materials;

[0019] Dry mix is ​​prepared by mixing high-speed ferrophase precursor cementitious materials with solid waste-based magnesium phosphate cementitious materials in a certain proportion.

[0020] Dissolve the water-reducing agent in water to obtain an admixture solution;

[0021] Add the additive solution to the dry mixture and stir until homogeneous to obtain the final product.

[0022] Preferably, the calcination temperature is 1300-1400℃, the heating rate is controlled at 5-10℃ / min, and the calcination time is 3-4.5h.

[0023] Thirdly, the present invention provides the application of the above-mentioned high corrosion-resistant all-solid waste-based marine cementitious material or the high corrosion-resistant all-solid waste-based marine cementitious material prepared by the above-mentioned preparation method in the field of marine engineering grouting materials.

[0024] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0025] (1) The high corrosion-resistant all-solid waste-based marine cementitious material of the present invention is prepared by combining solid waste-based magnesium phosphate cement-like material with high early strength and controllable setting time with high iron phase precursor cementitious material with high later strength and excellent erosion resistance. It has the advantages of short setting time, high mechanical strength, strong resistance to dissolution and erosion and low price, which meets the needs of marine engineering construction and has considerable economic and engineering value.

[0026] (2) While consuming a large amount of solid waste and realizing the resource utilization of solid waste, this invention solves the problem of large-scale solid waste accumulation occupying arable land, reduces the pollution and damage to the ecological environment, including soil and groundwater, and avoids the use of traditional cement, resulting in lower costs and good scientific value and ecological benefits. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] This invention provides a highly corrosion-resistant, all-solid-waste-based marine cementitious material, comprising 40-50 parts of high-iron phase precursor cementitious material, 35-45 parts of solid-waste-based magnesium phosphate cementitious material, 2-4 parts of water-reducing agent, and 30-50 parts of water;

[0029] The high-speed iron phase precursor cementitious material is obtained by calcining a mixture of calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste; the limestone saturation coefficient of the mixture is 0.87-0.96, the silicon content is 1.7-2.7 and the aluminum content is 0.9-1.9.

[0030] The solid waste-based magnesium phosphate cement material includes 15-25 parts calcium-based solid waste, 35-40 parts iron-based solid waste, 30-40 parts overburned magnesium oxide powder, 20-25 parts potassium dihydrogen phosphate, and 5-8 parts retarder.

[0031] In this invention, a balanced development is achieved between ferrophosphate-based cementitious materials with strong corrosion resistance and solid waste-based magnesium phosphate cementitious materials with high early strength. The gel, a hydration product of the ferrophosphate-based cementitious materials, can adsorb corrosive ions, has a small microstructure porosity, and is difficult for seawater to penetrate, effectively blocking the diffusion of chloride ions and other corrosive ions. The solid waste-based magnesium phosphate cementitious materials hydrate and set quickly, improving the pore structure and density, contributing to early strength, compensating for the low early strength of the ferrophosphate-based cementitious materials, and further enhancing corrosion resistance.

[0032] This invention makes full use of various solid wastes and has better properties such as erosion resistance compared to traditional cement and cementing materials made from fly ash. At the same time, compared with existing technologies for preparing cementing materials from solid waste, this invention has a higher utilization rate of solid waste and better results, and features full resource utilization of solid waste and environmental protection.

[0033] The combination of various solid waste components in the ferrous phase precursor cementitious material of this invention achieves the control of the contents of the main components CaO, SiO2, Al2O3, and Fe2O3 within a certain range. Each main component affects the rate design of the ferrous phase precursor cementitious material (limestone saturation coefficient, silicon content, and aluminum content). The silicon and calcium contents affect the strength contribution of the ferrous phase precursor cementitious material, while the aluminum and iron contents affect the ferrous phase precursor cementitious material's resistance to ion erosion and scouring, and also affect the setting time.

[0034] In this invention, the limestone saturation coefficient (KH) of the ferro-phase precursor cementitious material raw material (i.e., calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste, and iron-based solid waste raw material before calcination) ranges from 0.87 to 0.96, the silicon content (SM) ranges from 1.7 to 2.7, and the aluminum content (IM) ranges from 0.9 to 1.9. The chemical composition of the raw material is calculated by setting key parameters (KH, SM, IM), and then the theoretical mineral composition of the ferro-phase precursor cementitious material is calculated by chemical method. The calculation formulas are shown in equations (1) to (11).

[0035]

[0036]

[0037] Where ∑ takes the value of 97.5%, w CaO , These represent the mass percentages of CaO, SiO2, Al2O3, and Fe2O3, respectively. These represent the mass percentages of tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite, respectively.

[0038] The limestone saturation coefficient (KH) indicates the degree to which silica in a high-ferrous phase precursor cementitious material is saturated with calcium oxide to form tricalcium silicate. When the KH value is greater than 1, free calcium oxide will exist in the precursor; when the KH value is close to 1, the content of free calcium oxide in the mineral system is too high, resulting in poor volume stability and decreased performance of the precursor. To achieve the theoretically set mineral composition of the precursor while controlling the content of free calcium oxide, the KH value is controlled between 0.87 and 0.96.

[0039] The silica content (SM) reflects the relative content of silicate minerals (C3S, C2S) and flux minerals (C3A, C4AF) in the ferric phase precursor cementitious material. If the SM value is too high, it will result in an abundance of silicate minerals and a deficiency of flux minerals, which is beneficial to the precursor strength, but difficult to achieve with current synthesis processes. If the SM value is too low, there will be too much flux mineral in the precursor, which can easily lead to large lumps and ring formations during calcination, and also result in excessively low precursor strength. Therefore, the SM value is controlled between 1.7 and 2.7.

[0040] The aluminum ratio (IM) reflects the relative mass fractions of C3A and C4AF in ferric phase precursor cementitious materials. When the IM value is too high, the C3A content is excessive, and the C4AF content is relatively low, increasing the liquid phase viscosity and hindering C3S formation. Furthermore, excessive C3A content can cause rapid solidification of the material. Conversely, when the IM value is too low, the relative mass fraction of C3A is low, and the C4AF content is high, resulting in low liquid phase viscosity, which is conducive to C3S formation but can easily lead to large agglomeration within the kiln. Therefore, a value between 0.9 and 1.9 is selected as the control parameter for the IM value.

[0041] In this invention, the calcium-based solid waste of the high-iron phase precursor cementitious material and the solid waste-based magnesium phosphate cement material is selected from one or more of carbide slag, blast furnace slag, fly ash, limestone tailings, or shell powder, with a specific surface area of ​​300-450 m². 2 / kg. The iron-based solid waste of the high-iron phase precursor cementitious material and the solid waste-based magnesium phosphate cement material is selected from one or more of red mud, steel slag, steelmaking dust or grinding wheel mud, with a specific surface area of ​​300-450 m². 2 / kg.

[0042] In this invention, the silicon-based solid waste is selected from one or more of coal gangue, silica fume, or waste glass, with a specific surface area of ​​300–450 m². 2 / kg. The aluminum-based solid waste is selected from one or more of aluminum ash, red mud, waste aluminum foil, or aluminum tailings, with a specific surface area of ​​300-450 m². 2 / kg.

[0043] In this invention, the retarder is selected from one or more of borax, malic acid, urea, lignosulfonic acid, or triethanolamine. The retarder slows down the setting and hardening of the cementitious material, preventing excessively rapid setting and thus avoiding construction inconvenience.

[0044] In this invention, the water-reducing agent is selected from one or more of naphthalene-based water-reducing agents, fatty acid water-reducing agents, or aminosulfonate-based water-reducing agents. The water-reducing agent, in conjunction with the ferric phase precursor cementitious material, adjusts the stability of setting time, early strength, and later strength within a certain range.

[0045] This invention also provides a method for preparing the above-mentioned high corrosion-resistant all-solid waste-based marine cementitious material, comprising the following steps:

[0046] Calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste are mixed and then calcined to obtain a high-iron phase precursor cementitious material.

[0047] Calcium-based solid waste, iron-based solid waste, overburned magnesium oxide powder, potassium dihydrogen phosphate and retarder are mixed to obtain solid waste-based magnesium phosphate cement materials;

[0048] Dry mix is ​​prepared by mixing high-speed ferrophase precursor cementitious materials with solid waste-based magnesium phosphate cementitious materials in a certain proportion.

[0049] Dissolve the water-reducing agent in water to obtain an admixture solution;

[0050] Add the additive solution to the dry mixture and stir until homogeneous to obtain the final product.

[0051] In this invention, before the calcium-based, silicon-based, aluminum-based, and iron-based solid wastes are mixed and calcined, each solid waste raw material needs to be dried to ensure that its moisture content is below 25%, thus avoiding the influence of moisture on the overall structure formed by the combination of various raw materials during the calcination process. Furthermore, it is preferable that each solid waste raw material be ground and sieved before calcination, with a sieve size of 50-150 mesh, more preferably 100 mesh. Sieving before calcination can improve the uniformity of calcination.

[0052] In this invention, the calcination temperature is 1300–1400℃, more preferably 1300–1360℃; the heating rate is controlled at 5–10℃ / min, and the calcination time is 3–4.5 h. High-temperature calcination can promote chemical reactions between raw material molecules, forming new substances, such as silicate minerals and aluminoferrite minerals. These new substances have a significant impact on the mechanical properties and erosion resistance of the high-ferric phase precursor cementitious materials.

[0053] After calcination, the present invention further includes a cooling step, which specifically involves: water cooling followed by natural cooling for 5-15 minutes and then natural cooling for 2-4 hours; more preferably, water cooling for 5-10 minutes and then natural cooling for 2-3 hours.

[0054] In this invention, after cooling to obtain the calcined product, the process further includes crushing, grinding, and sieving. The sieve is a 150-250 mesh sieve, preferably a 200 mesh sieve. Uniform particle size is beneficial for subsequent mixing and hydration processes.

[0055] In this invention, the specific surface area of ​​the dry mixture obtained by mixing the high-speed rail phase precursor cementitious material with solid waste-based magnesium phosphate cementitious material is 350-450 m². 2 / kg, more preferably 380-420m 2 / kg.

[0056] This invention also provides the application of the above-mentioned high corrosion-resistant all-solid waste-based marine cementitious material in the field of marine engineering grouting materials.

[0057] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0058] Example 1

[0059] (1) Dry red mud, carbide slag, silica fume, limestone tailings and aluminum ash to a moisture content of no more than 25% and pass them through a 100-mesh sieve; mix the various dried materials together, with the following solid mass: 40g red mud, 30g carbide slag, 10g silica fume, 15g limestone tailings and 5g aluminum ash, and homogenize them to obtain a mixture; the limestone saturation coefficient (KH) of the mixture is 0.89, the silica ratio (SM) is 1.74 and the aluminum ratio (IM) is 0.93.

[0060] (2) The mixture was heated to 1300℃ at a heating rate of 10℃ / min and calcined for 3.16h. The calcined product was first cooled with water for 5min and then cooled naturally for 2h. The cooled calcined product was crushed, ground and passed through a 200-mesh sieve to obtain the ferric phase precursor cementitious material.

[0061] (3) Mix 40g of red mud, 20g of blast furnace slag, 35g of overburned magnesium oxide powder, 20g of potassium dihydrogen phosphate and 6g of borax to obtain solid waste-based magnesium phosphate cement material.

[0062] (4) Mix 90g of high-iron phase precursor cementitious material and 80g of solid waste-based magnesium phosphate cementitious material to obtain dry mix; dissolve 6g of naphthalene-based water-reducing agent in 90g of water to obtain admixture solution for later use; add admixture solution to dry mix and stir evenly to prepare high corrosion-resistant all-solid waste-based marine cementitious material.

[0063] Example 2

[0064] (1) Dry red mud, carbide slag, silica fume, limestone tailings and aluminum ash to a moisture content of no more than 25% and pass them through a 100-mesh sieve; mix the various dried materials together, with the following solid mass: 40g red mud, 30g carbide slag, 10g silica fume, 15g limestone tailings and 5g aluminum ash, and homogenize them to obtain a mixture; the limestone saturation coefficient (KH) of the mixture is 0.89, the silica ratio (SM) is 1.74 and the aluminum ratio (IM) is 0.93.

[0065] (2) The mixture was heated to 1330℃ at a heating rate of 10℃ / min and calcined for 3.22h. The calcined product was first cooled with water for 5min and then cooled naturally for 2h. The cooled calcined product was crushed, ground and passed through a 200-mesh sieve to obtain the ferric phase precursor cementitious material.

[0066] (3) Mix 40g of red mud, 20g of blast furnace slag, 35g of overburned magnesium oxide powder, 20g of potassium dihydrogen phosphate and 6g of borax to obtain solid waste-based magnesium phosphate cement material.

[0067] (4) Mix 90g of high-iron phase precursor cementitious material and 85g of solid waste-based magnesium phosphate cementitious material to obtain dry mix; dissolve 6g of naphthalene-based water-reducing agent in 95g of water to obtain admixture solution for later use; add admixture solution to dry mix and stir evenly to prepare high corrosion-resistant all-solid waste-based marine cementitious material.

[0068] Example 3

[0069] (1) Dry red mud, carbide slag, silica fume, limestone tailings and aluminum ash to a moisture content of no more than 25% and pass them through a 100-mesh sieve; mix the various dried materials together, with the following solid mass: 40g red mud, 30g carbide slag, 10g silica fume, 15g limestone tailings and 5g aluminum ash, and homogenize them to obtain a mixture; the limestone saturation coefficient (KH) of the mixture is 0.89, the silica ratio (SM) is 1.74 and the aluminum ratio (IM) is 0.93.

[0070] (2) The temperature was raised to 1300℃ at a heating rate of 10℃ / min and calcined for 3.16h. The calcined product was first cooled with water for 5min and then cooled naturally for 2h. The cooled calcined product was crushed, ground, and passed through a 200-mesh sieve to obtain the ferric phase precursor cementitious material.

[0071] (3) Mix 35g red mud, 20g blast furnace slag, 35g overburned magnesium oxide powder, 25g potassium dihydrogen phosphate and 6g urea to obtain solid waste-based magnesium phosphate cement material.

[0072] (4) Mix 90g of high-iron phase precursor cementitious material and 80g of solid waste-based magnesium phosphate cementitious material to obtain dry mix; dissolve 6g of naphthalene-based water-reducing agent in 90g of water to obtain admixture solution for later use; add admixture solution to dry mix and stir evenly to prepare high corrosion-resistant all-solid waste-based marine cementitious material.

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 1 is that no solid waste-based magnesium phosphate cementitious materials are added.

[0075] (1) Dry red mud, carbide slag, silica fume, limestone tailings and aluminum ash to a moisture content of no more than 25% and pass them through a 100-mesh sieve; mix the various dried materials together, with the following solid mass: 40g red mud, 30g carbide slag, 10g silica fume, 15g limestone tailings and 5g aluminum ash, and homogenize them to obtain a mixture; the limestone saturation coefficient (KH) of the mixture is 0.89, the silica ratio (SM) is 1.74 and the aluminum ratio (IM) is 0.93.

[0076] (2) The mixture was heated to 1300℃ at a heating rate of 10℃ / min and calcined for 3.16h. The calcined product was first cooled with water for 5min and then cooled naturally for 2h. The cooled calcined product was crushed, ground and passed through a 200-mesh sieve to obtain the ferric phase precursor cementitious material.

[0077] (3) Dissolve 6g of naphthalene-based water-reducing agent in 90g of water to obtain an admixture solution. Add the admixture solution to 90g of high-iron phase precursor cementitious material and stir evenly to prepare cementitious material.

[0078] Comparative Example 2

[0079] The difference between this comparative example and Example 1 is that no high-speed iron phase precursor cementitious material is added.

[0080] (1) Mix 40g of red mud, 20g of blast furnace slag, 35g of overburned magnesium oxide powder, 20g of potassium dihydrogen phosphate and 6g of borax to obtain solid waste-based magnesium phosphate cement material.

[0081] (2) Dissolve 6g of naphthalene-based water-reducing agent in 90g of water to obtain an admixture solution; add the admixture solution to 80g of solid waste-based magnesium phosphate cement material and stir evenly to prepare a cementitious material.

[0082] Test case

[0083] Concrete was prepared using the high corrosion-resistant all-solid waste-based marine cementitious materials prepared in Examples 1-3 and the cementitious materials in Comparative Examples 1-2. The concrete was prepared in accordance with the "Specification for Mix Proportion Design of Ordinary Concrete" JGJ 55-2011. The properties of the concrete prepared in Examples 1-3 and Comparative Examples 1-2 are shown in Table 1.

[0084] Table 1. Performance test results of concrete in the examples and comparative examples.

[0085]

[0086]

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly corrosion-resistant, all-solid waste-based marine cementitious material, characterized in that, It includes 40-50 parts of high-speed ferrophase precursor cementitious material, 35-45 parts of solid waste-based magnesium phosphate cementitious material, 2-4 parts of water-reducing agent and 30-50 parts of water; The high-speed iron phase precursor cementitious material is obtained by calcining a mixture of calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste; the limestone saturation coefficient of the mixture is 0.87~0.96, the silicon content is 1.7~2.7 and the aluminum content is 0.9~1.

9. The solid waste-based magnesium phosphate cement material includes 15-25 parts calcium-based solid waste, 35-40 parts iron-based solid waste, 30-40 parts overburned magnesium oxide powder, 20-25 parts potassium dihydrogen phosphate, and 5-8 parts retarder.

2. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The high-speed ferrophase precursor cementitious material and the calcium-based solid waste of the solid waste-based magnesium phosphate cement material are selected from one or more of carbide slag, blast furnace slag, fly ash, limestone tailings, or shell powder, with a specific surface area of ​​300~450m². 2 / kg.

3. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The iron-based solid waste in the high-speed ferrophase precursor cementitious material and the solid waste-based magnesium phosphate cementitious material is selected from one or more of red mud, steel slag, steelmaking dust, or grinding wheel mud, with a specific surface area of ​​300~450 m². 2 / kg.

4. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The silicon-based solid waste is selected from one or more of coal gangue, silica fume, or waste glass, with a specific surface area of ​​300-450 m². 2 / kg.

5. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The aluminum-based solid waste is selected from one or more of aluminum ash, red mud, waste aluminum foil, or aluminum tailings, with a specific surface area of ​​300-450 m². 2 / kg.

6. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The retarder is selected from one or more of borax, malic acid, urea or triethanolamine.

7. The high corrosion-resistant all-solid waste-based marine cementitious material as described in claim 1, characterized in that, The water-reducing agent is selected from one or more of naphthalene-based water-reducing agents, fatty acid water-reducing agents, or aminosulfonate-based water-reducing agents.

8. The method for preparing the high corrosion-resistant all-solid waste-based marine cementitious material according to any one of claims 1 to 7, characterized in that, Includes the following steps: Calcium-based solid waste, silicon-based solid waste, aluminum-based solid waste and iron-based solid waste are mixed and then calcined to obtain a high-iron phase precursor cementitious material. Calcium-based solid waste, iron-based solid waste, overburned magnesium oxide powder, potassium dihydrogen phosphate and retarder are mixed to obtain solid waste-based magnesium phosphate cement materials; Dry mix is ​​prepared by mixing high-speed ferrophase precursor cementitious materials with solid waste-based magnesium phosphate cementitious materials in a certain proportion. Dissolve the water-reducing agent in water to obtain an admixture solution; Add the additive solution to the dry mixture and stir until homogeneous to obtain the final product.

9. The preparation method according to claim 8, characterized in that, The calcination temperature is 1300~1400℃, the heating rate is controlled at 5~10℃ / min, and the calcination time is 3~4.5 h.

10. The application of the high corrosion-resistant all-solid waste-based marine cementitious material as described in any one of claims 1 to 7 or the high corrosion-resistant all-solid waste-based marine cementitious material prepared by the preparation method described in any one of claims 8 to 9 in the field of marine engineering grouting materials.

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