A high-strength marine sludge solidifying agent resistant to seawater corrosion and preparation method thereof

Abstract

The present invention relates to the technical field of curing agent preparation, specifically a high-strength marine silt curing agent resistant to seawater corrosion and a preparation method thereof, wherein the curing agent includes the following components by mass: 40-60 parts of a main material, 10-15 parts of an activator, 2-8 parts of a coagulant, and 2-5 parts of modified nano-calcium carbonate; the main material is one of yellow phosphorus slag powder, magnesium smelting slag powder, and blast furnace slag powder; the activator is one of phosphorus slag Portland cement, alkali-making white mud, and papermaking lime slag; the coagulant is one of sodium chloride, magnesium chloride, potassium sulfate, and magnesium sulfate. The curing agent prepared by the present invention can improve the compactness of the cured sample, reduce the intrusion of ions in seawater, and is coated with nano-calcium carbonate by polydopamine, which not only disperses evenly, but also optimizes the subsequent hydration process.

Description

Technical Field

[0001] The invention relates to the technical field of curing agent preparation, in particular to a high-strength marine sludge curing agent resistant to seawater corrosion and a preparation method thereof. Background Art

[0002] my country's coastal areas are home to vast deposits of deep marine silt, characterized by high water content, high compressibility, poor permeability, low strength, and poor bearing capacity. To meet the demands of foundation design for engineering construction, there is an urgent need to rapidly improve the bearing capacity of marine silt foundations in construction areas. A common treatment for marine silt is in-situ solidification using curing materials, with cement being one of the most commonly used. However, cement curing of marine silt not only requires large amounts of cement, a long curing cycle, and poor curing results, but also degrades the resulting solidified structure after prolonged immersion in seawater. In particular, the physical and chemical effects of loads, chloride ions, sulfate ions, and other agents can easily corrode and damage the solidified structure, destroying its internal structure and leading to a decrease in strength and durability, thus seriously impacting the safety of the building's structural system. Therefore, developing a high-strength, low-cost, environmentally friendly, and seawater-corrosion-resistant marine silt curing agent is of great practical significance for marine silt foundation reinforcement. Summary of the Invention

[0003] The object of the present invention is to provide a high-strength marine sludge solidifying agent resistant to seawater corrosion and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A high-strength marine sludge solidifying agent resistant to seawater corrosion, comprising the following components in parts by mass:

[0006] 40-60 parts of main material, 10-15 parts of activator, 2-8 parts of coagulant, 2-5 parts of modified nano calcium carbonate;

[0007] The main material is one of yellow phosphorus slag powder, magnesium smelting slag powder and blast furnace slag powder;

[0008] The activator is one of phosphorus slag silicate cement, alkali-making white mud, and papermaking lime slag;

[0009] The coagulant is one of sodium chloride, magnesium chloride, potassium sulfate and magnesium sulfate;

[0010] The preparation method of the modified nano calcium carbonate comprises the following steps:

[0011] S101, ultrasonically dispersing nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, adjusting the pH of the buffer solution to 8.5, introducing air, reacting for 6-15 hours, centrifuging, and washing the product with sufficient deionized water and vacuum drying;

[0012] S102, dispersing the nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and reacting continuously for 4-8 hours, then filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate.

[0013] Furthermore, in step S101, the mass ratio of dopamine hydrochloride, nano-calcium carbonate and Tris-HCl buffer solution is 1:(2-4):(160-240).

[0014] Furthermore, the mass ratio of chitosan, acetic acid and deionized water in step S102 to the nano-calcium carbonate treated in step S101 is 1:(2-5):(200-300):(20-50).

[0015] Furthermore, the main material needs to be pre-treated, and the pre-treatment steps of the main material are:

[0016] S201, placing the main material into a muffle furnace and calcining it at 800-1000° C. and keeping it warm for 1-3 hours;

[0017] S202, soaking the main material treated in step S201 in a deionized water solution containing dodecyltrimethylammonium chloride and citric acid for 0.5-4 hours, centrifugally filtering, and washing the product with sufficient deionized water and vacuum drying.

[0018] Furthermore, the mass ratio of dodecyltrimethylammonium chloride, citric acid and deionized water in step S202 to the main material treated in step S102 is 1:(10-20):(800-1000):(50-100).

[0019] A method for preparing a high-strength marine sludge solidifying agent that is resistant to seawater corrosion comprises the following steps:

[0020] S1. Add the main material and modified nano-calcium carbonate to deionized water, stir for 10-20 minutes, and rotary evaporate to dryness to obtain a mixture;

[0021] S2. Add a coagulant and an activator to the mixture obtained in step S1, stir and mix until uniform, and then vacuum dry to obtain a high-strength marine silt solidifier that is resistant to seawater corrosion.

[0022] Furthermore, in step S1, the ratio of the mass of deionized water to the sum of the mass of the main material and the modified nano-calcium carbonate is 2.5:1.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention effectively improves the density of the cured sample by adding nano-calcium carbonate to the curing agent, reduces the intrusion of particles in seawater into the cured sample, and improves the strength of the cured sample;

[0025] 2. In the present invention, the outer side of the nano-calcium carbonate is wrapped by polydopamine, and chitosan is connected to the polydopamine. Combined with the main material modified with citric acid, it is convenient for the modified nano-calcium carbonate to combine with the main material. During the hydration process, under the alkaline environment provided, the polydopamine is gradually degraded and the nano-calcium carbonate is gradually exposed, which continuously promotes the hydration process of the concrete and improves the later strength of the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a process flow chart for preparing a high-strength marine sludge solidifying agent resistant to seawater corrosion in the present invention;

[0027] Figure 2 This is a process flow chart for preparing modified nano-calcium carbonate in the present invention;

[0028] Figure 3 This is a process flow chart for the pretreatment of the main material in the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figures 1 to 3 , the present invention provides:

[0031] Example 1

[0032] A method for preparing a high-strength marine sludge solidifying agent that is resistant to seawater corrosion comprises the following steps:

[0033] S1. Add 270 g of blast furnace slag powder and 22 g of modified nano-calcium carbonate to 730 g of deionized water, stir for 16 min, and rotary evaporate to dryness to obtain a mixture;

[0034] S2. Add 30 g of sodium chloride and 60 g of phosphorus slag Portland cement to the mixture obtained in step S1, stir and mix evenly, and then vacuum dry to obtain a high-strength marine sludge solidifying agent that is resistant to seawater corrosion;

[0035] The preparation method of the modified nano calcium carbonate comprises the following steps:

[0036] S101, ultrasonically dispersing 60 g of nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, where the amounts of dopamine hydrochloride and Tris-HCl buffer solution are 20 g and 3.9 kg, respectively. The pH of the buffer solution is adjusted to 8.5, and air is introduced. After reacting for 12 h, the mixture is centrifuged and filtered. The product is washed with sufficient deionized water and vacuum dried.

[0037] S102, dispersing 54g of nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, wherein the amounts of chitosan, acetic acid, and deionized water are 1.8g, 7.2g, and 450g, respectively, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and continuing the reaction for 5h. Afterwards, filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate;

[0038] The above-mentioned blast furnace slag powder needs to be pre-treated. The pre-treatment steps of the blast furnace slag powder are as follows:

[0039] S201, placing 400 g of blast furnace slag powder into a muffle furnace and calcining at 900° C. and keeping the temperature for 2.5 h;

[0040] S202. Place 320 g of blast furnace slag powder treated in step S201 into a deionized water solution containing dodecyltrimethylammonium chloride and citric acid and soak for 2.8 hours. The amounts of dodecyltrimethylammonium chloride, citric acid and deionized water used are 4.6 g, 69 g and 4.15 kg, respectively. Then, centrifuge and filter. The product is washed with sufficient deionized water and then vacuum-dried.

[0041] Example 2

[0042] A method for preparing a high-strength marine sludge solidifying agent that is resistant to seawater corrosion comprises the following steps:

[0043] S1. Add 200 g of blast furnace slag powder and 10 g of modified nano-calcium carbonate to 525 g of deionized water, stir for 10 min, and rotary evaporate to dryness to obtain a mixture;

[0044] S2, adding 50g of alkali-making white mud and 10g of magnesium chloride to the mixture obtained in step S1, stirring and mixing, and then vacuum drying to obtain a high-strength marine silt solidifier that is resistant to seawater corrosion;

[0045] The preparation method of the modified nano calcium carbonate comprises the following steps:

[0046] S101, ultrasonically dispersing 60 g of nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, where the amounts of dopamine hydrochloride and Tris-HCl buffer solution are 30 g and 4.8 kg, respectively. The pH of the buffer solution is adjusted to 8.5, and air is introduced. After reacting for 6 h, the mixture is centrifuged and filtered. The product is washed with sufficient deionized water and vacuum dried.

[0047] S102, dispersing 54g of nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, wherein the amounts of chitosan, acetic acid, and deionized water are 2.7g, 5.4g, and 540g, respectively, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and continuing the reaction for 4h. Afterwards, filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate;

[0048] The above-mentioned blast furnace slag powder needs to be pre-treated. The pre-treatment steps of the blast furnace slag powder are as follows:

[0049] S201, placing 400 g of blast furnace slag powder into a muffle furnace and calcining at 800° C. and keeping the temperature for 1 hour;

[0050] S202. Place 320 g of blast furnace slag powder treated in step S201 into a deionized water solution containing dodecyltrimethylammonium chloride and citric acid and soak for 0.5 h. The amounts of dodecyltrimethylammonium chloride, citric acid and deionized water used are 6.4 g, 64 g and 5.12 kg, respectively. Then, centrifuge and filter. The product is washed with sufficient deionized water and then vacuum-dried.

[0051] Example 3

[0052] A method for preparing a high-strength marine sludge solidifying agent that is resistant to seawater corrosion comprises the following steps:

[0053] S1. Add 300 g of yellow phosphorus slag powder and 25 g of modified nano-calcium carbonate to 812.5 g of deionized water, stir for 20 min, and rotary evaporate to dryness to obtain a mixture;

[0054] S2. Add 40 g of potassium sulfate and 75 g of phosphorus slag Portland cement to the mixture obtained in step S1, stir and mix evenly, and then vacuum dry to obtain a high-strength marine silt solidifier that is resistant to seawater corrosion;

[0055] The preparation method of the modified nano calcium carbonate comprises the following steps:

[0056] S101, ultrasonically dispersing 60 g of nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, where the amounts of dopamine hydrochloride and Tris-HCl buffer solution are 15 g and 3.6 kg, respectively. The pH of the buffer solution is adjusted to 8.5, and air is introduced. After reacting for 15 h, the mixture is centrifuged and filtered. The product is washed with sufficient deionized water and vacuum dried.

[0057] S102, dispersing 54g of nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, wherein the amounts of chitosan, acetic acid, and deionized water are 1.08g, 5.4g, and 324g, respectively, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and continuing the reaction for 8h. Afterwards, filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate;

[0058] The yellow phosphorus slag powder needs to be pre-treated. The pre-treatment steps of the yellow phosphorus slag powder are as follows:

[0059] S201, placing 400 g of yellow phosphorus slag powder into a muffle furnace and calcining it at 1000° C. and keeping it at this temperature for 3 h;

[0060] S202. Place 320 g of yellow phosphorus slag powder treated in step S201 into a deionized water solution containing dodecyltrimethylammonium chloride and citric acid and soak for 4 hours. The amounts of dodecyltrimethylammonium chloride, citric acid and deionized water used are 3.2 g, 64 g and 3.2 kg, respectively. Centrifuge and filter. Wash the product with sufficient deionized water and then vacuum dry.

[0061] Example 4

[0062] A method for preparing a high-strength marine sludge solidifying agent that is resistant to seawater corrosion comprises the following steps:

[0063] S1. Add 225 g of magnesium smelting slag powder and 18 g of modified nano-calcium carbonate to 607.5 g of deionized water, stir for 12 min, and rotary evaporate to dryness to obtain a mixture;

[0064] S2. Add 20 g of magnesium sulfate and 70 g of phosphorus slag Portland cement to the mixture obtained in step S1, stir and mix evenly, and then vacuum dry to obtain a high-strength marine silt curing agent that is resistant to seawater corrosion;

[0065] The preparation method of the modified nano calcium carbonate comprises the following steps:

[0066] S101, ultrasonically dispersing 60 g of nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, where the amounts of dopamine hydrochloride and Tris-HCl buffer solution are 20 g and 3.9 kg, respectively. The pH of the buffer solution is adjusted to 8.5, and air is introduced. After reacting for 14 h, the mixture is centrifuged and filtered. The product is washed with sufficient deionized water and vacuum dried.

[0067] S102, dispersing 54g of nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, wherein the amounts of chitosan, acetic acid, and deionized water are 1.4g, 5.6g, and 350g, respectively, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and continuing the reaction for 7h. Afterwards, filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate;

[0068] The above-mentioned magnesium smelting slag powder needs to be pre-treated. The pre-treatment steps of the magnesium smelting slag powder are as follows:

[0069] S201, placing 400 g of magnesium smelting slag powder into a muffle furnace and calcining at 960° C. and keeping the temperature for 2.5 h;

[0070] S202. Place 320 g of magnesium smelting slag powder treated in step S201 into a deionized water solution containing dodecyltrimethylammonium chloride and citric acid and soak for 3 hours. The amounts of dodecyltrimethylammonium chloride, citric acid and deionized water are 4.5 g, 58 g and 4.1 kg, respectively. Centrifuge and filter. Wash the product with sufficient deionized water and then vacuum dry.

[0071] The specific surface area of ​​the yellow phosphorus slag powder, magnesium smelting slag powder, blast furnace slag powder, phosphorus slag silicate cement, alkali white mud, and papermaking lime slag used in the present invention is ≥400m 2 / kg; the particle size of the nano calcium carbonate used in the present invention is 200-400nm.

[0072] The main materials are smelting slag. The main components of yellow phosphorus slag powder are silicon dioxide (SiO2) and calcium oxide (CaO); the main components of magnesium smelting slag powder are calcium oxide (CaO), silicon dioxide (SiO2) and magnesium oxide (MgO); the main components of blast furnace slag powder are silicon dioxide (SiO2), calcium oxide (CaO), magnesium oxide (MgO) and aluminum oxide (Al2O3);

[0073] The main components of the phosphate slag silicate cement in the present invention include silicate cement clinker, granulated electric furnace phosphate slag and an appropriate amount of gypsum; the main components of the alkali-making white mud include calcium carbonate, calcium hydroxide and other impurities, and refer to the alkaline waste residue discharged during the industrial alkali production and alkali treatment process, specifically the by-products of the raw materials calcium oxide and sodium chloride in the ammonia-soda process, which are produced through roasting and precipitation, and the main components are calcium carbonate, calcium sulfate, calcium chloride, sulfur dioxide, etc.; the main components of papermaking lime slag are calcium carbonate and calcium hydroxide.

[0074] Comparative Example 1

[0075] The difference between Comparative Example 1 and Example 1 is that step S102 is completely eliminated, and the remaining steps are exactly the same as those in Example 1.

[0076] Comparative Example 2

[0077] The difference between Comparative Example 2 and Example 1 is that step S202 is completely eliminated, and the remaining steps are exactly the same as those in Example 1.

[0078] Comparative Example 3

[0079] The difference between Comparative Example 3 and Example 1 is that step S201 is completely eliminated, and the remaining steps are exactly the same as those in Example 1.

[0080] Comparative Example 4

[0081] The difference between Comparative Example 4 and Example 1 is that the modified nano-calcium carbonate is replaced with ordinary nano-calcium carbonate, and the remaining steps are exactly the same as those of Example 1.

[0082] Comparative Example 5

[0083] The difference between Comparative Example 5 and Example 1 is that step S101 and step S102 are canceled, and the aminated nano-calcium carbonate is prepared separately. Specifically, the nano-calcium carbonate is ultrasonically dispersed in anhydrous ethanol, a 15wt% deionized water solution of 3-aminopropyltriethoxysilane is added dropwise, and then 28wt% ammonia water is added dropwise. The reaction is continued for 10 hours, and then centrifuged and filtered. The product is washed with sufficient deionized water to obtain the aminated nano-calcium carbonate; in this embodiment, the mass ratio of nano-calcium carbonate, anhydrous ethanol, the deionized water solution of 3-aminopropyltriethoxysilane and ammonia water is 1:140:8:8.

[0084] A total of 9 groups of curing agents were prepared through the above Examples 1-4 and Comparative Examples 1-5. The above 9 groups of curing agents were mixed with marine silt respectively. The mass ratio between the curing agent and the marine silt was 1:8. After the curing agent and the marine silt were completely mixed, the mixture was compacted and placed in a curing box for curing at a temperature of 22° C. and a relative humidity of 90%. The curing time was 28 days. During the curing process, the unconfined compressive strength was measured at 7 days, 14 days, and 28 days. After the curing was completed, 8 groups of samples were obtained. The cured samples were further placed in simulated seawater for 15 days (Na in seawater is 0.04). + The concentration of Cl is 10.8 g / kg, - The concentration of Mg is 19.4 g / kg, 2+ The concentration is 1.3g / kg, SO4 2- The concentration of Ca is 2.6 g / kg, 2+ The concentration of K is 0.3g / kg, + The concentration is 0.4g / kg, HCO3 - The concentration is 0.15g / kg), and the unconfined compressive strength of the concrete is measured after immersion;

[0085] The measurement standard was completed in accordance with the "Standard for Geotechnical Test Methods" (GB / T50123-2019). The test results are shown in Tables 1 and 2 below:

[0086] Table 1: Unconfined compressive strength test results of samples prepared in Examples 1-4 and Comparative Examples 1-5 at 7 days, 14 days and 28 days

[0087] ;

[0088] Table 2: Unconfined compressive strength of samples prepared in Examples 1-4 and Comparative Examples 1-5 after immersion in simulated seawater for 15 days

[0089] ;

[0090] Combining the data of Example 1 and Comparative Examples 4-5 in Table 1-2 above, it can be seen that the initial unconfined compressive strength of the samples of Comparative Example 4-5 is not weaker than the unconfined compressive strength of Example 1. As time goes by, the gap in unconfined compressive strength between Example 1 and Comparative Example 4-5 begins to widen. The nano-calcium carbonate in Comparative Example 4-5 lacks polydopamine coating, which can quickly participate in the hydration reaction, which is beneficial to the improvement of the initial strength of the sample. In Example 1, polydopamine-coated nano-calcium carbonate gradually degrades in an alkaline hydration environment, and the nano-calcium carbonate is controllably released, continuously providing nucleation sites, continuously promoting hydration, and improving the later forming strength of the concrete; Comparative Example 5 prepares amino-added nano-calcium carbonate, and the role played by the amino-added nano-calcium carbonate is similar to that of connecting chitosan to the surface of polydopamine, both of which are to allow the surface of the material to be provided with amino groups, so as to facilitate combination with the main material modified with citric acid. Compared with Comparative Example 4, its strength is further improved;

[0091] In the present invention, the surface of the nano-calcium carbonate and the surface of the main material are further treated through steps S102 and S202, so that the two can be more evenly combined, thereby improving the strength of the sample after being immersed in seawater; wherein, in comparative example 1, the further treatment of the nano-calcium carbonate surface is eliminated, the addition of chitosan is eliminated, and the positive charge attached to the surface of the nano-calcium carbonate is reduced (the protonated amino group of glucose on chitosan is positively charged, and the zeta potential of polydopamine is negatively charged, and the two are electrostatically bonded. In addition, the two are also easy to combine due to hydrogen bonds such as phenolic hydroxyl groups and amino groups. Therefore, the addition of chitosan can increase the number of positive charges on the surface of the nano-calcium carbonate); in comparative example 2, the treatment of the surface of the main material is eliminated, the modification of its surface by citric acid is eliminated, and the attachment of negative charges is reduced. When the surface of the main material and the surface of the nano-calcium carbonate are treated at the same time, the combination of positive and negative charges, combined with the rotary evaporation process, allows the two materials to be evenly combined with each other; in addition, in comparative example 3, the calcination of the main material is eliminated, and the calcination is for activating the surface of the main material.

[0092] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength marine sludge solidifying agent resistant to seawater corrosion, characterized in that: The components by mass are as follows: 40-60 parts of main material, 10-15 parts of activator, 2-8 parts of coagulant, 2-5 parts of modified nano calcium carbonate; The main material is one of yellow phosphorus slag powder, magnesium smelting slag powder and blast furnace slag powder; The activator is one of phosphorus slag silicate cement, alkali-making white mud, and papermaking lime slag; The coagulant is one of sodium chloride, magnesium chloride, potassium sulfate and magnesium sulfate; The preparation method of the modified nano calcium carbonate comprises the following steps: S101, ultrasonically dispersing nano-calcium carbonate into a Tris-HCl buffer solution containing dopamine hydrochloride, adjusting the pH of the buffer solution to 8.5, introducing air, reacting for 6-15 hours, centrifuging, and washing the product with sufficient deionized water and vacuum drying; S102, dispersing the nano-calcium carbonate treated in step S101 into a deionized water solution of acetic acid and chitosan, adding sodium hydroxide solution dropwise, adjusting the pH to 8, and continuing the reaction for 4-8 hours, then filtering, and washing the product with sufficient deionized water to obtain modified nano-calcium carbonate; The main material needs to be pre-treated, and the pre-treatment steps of the main material are: S201, placing the main material into a muffle furnace and calcining it at 800-1000° C. and keeping it warm for 1-3 hours; S202, soaking the main material treated in step S201 in a deionized water solution containing dodecyltrimethylammonium chloride and citric acid for 0.5-4 hours, centrifugally filtering, and washing the product with sufficient deionized water and vacuum drying.

2. The high-strength marine sludge solidifying agent resistant to seawater corrosion according to claim 1, characterized in that: In step S101, the mass ratio of dopamine hydrochloride, nano-calcium carbonate and Tris-HCl buffer solution is 1:(2-4):(160-240).

3. The high-strength marine sludge solidifying agent resistant to seawater corrosion according to claim 1, characterized in that: The mass ratio of chitosan, acetic acid and deionized water in step S102 to the nano-calcium carbonate treated in step S101 is 1:(2-5):(200-300):(20-50).

4. The high-strength marine sludge solidifying agent resistant to seawater corrosion according to claim 1, characterized in that: The mass ratio of dodecyltrimethylammonium chloride, citric acid and deionized water in step S202 to the main material treated in step S102 is 1:(10-20):(800-1000):(50-100).

5. The method for preparing the high-strength marine sludge solidifying agent resistant to seawater corrosion according to any one of claims 1 to 4, comprising the following steps: S1. Add the main material and modified nano-calcium carbonate to deionized water, stir for 10-20 minutes, and rotary evaporate to dryness to obtain a mixture; S2. Add a coagulant and an activator to the mixture obtained in step S1, stir and mix evenly, and then vacuum dry to obtain a high-strength marine silt solidifier that is resistant to seawater corrosion.

6. The method for preparing the high-strength marine sludge solidifying agent resistant to seawater corrosion according to claim 5, characterized in that: In step S1, the ratio of the mass of deionized water to the sum of the mass of the main material and the modified nano-calcium carbonate is 2.5:1.

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