Preparation method of composite ternary system sludge solidifying agent

Abstract

The present application relates to the technical field of sludge solidifying agent, and discloses a preparation method of a composite ternary system sludge solidifying agent, which comprises the following steps: placing ternary cementing material, mineral powder and slag reducing agent in a stirrer to stir and form A material; mixing polyacrylate emulsion, styrene-acrylic emulsion and water to stir and form B material; and respectively placing A material and B material in the stirrer to stir and form the composite ternary system sludge solidifying agent. The ternary cementing material is respectively silicate cement, sulphoaluminate cement and gypsum, which can cause ternary system solidification, reinforce and densify the cement stone structure, ensure the growth of the late strength of cement, cause mineral powder and alkali slag to be solidified by mineral powder slag reduction, strengthen the whole solidification system and make the late strength develop well, and the solidified sludge has the characteristics of extremely fast early strength development, good water stability and high late strength by mixing polyacrylate emulsion and styrene-acrylic emulsion polymer materials to improve the soil performance.

Description

Technical Field

[0001] This invention patent relates to the technical field of sludge solidification agents, and more specifically, to a method for preparing a composite ternary system sludge solidification agent. Background Technology

[0002] my country began introducing foreign soil stabilizer technology in the 1980s, and based on absorbing foreign experience, it started research on soil stabilizers tailored to the properties of Chinese soil.

[0003] During urban construction in major coastal cities, a large number of coastal silt sites require foundation reinforcement. Consequently, several companies have emerged dedicated to the research of solidification agents and have achieved certain results in silt reinforcement practices.

[0004] In existing technologies, cement is the most commonly used material in traditional sludge solidification agents. Studies on the solidification effect of cement on sludge show that there is a minimum value for the amount of cement added. When the amount of cement added is lower than this minimum, the solidification effect of cement on sludge is very low. Furthermore, as the water content in the soil increases, the strength of the solidified sludge shows a significant downward trend. At the same time, the content of organic acids greatly affects the soil solidification effect. In soils with high organic acid content, the cement reinforcement effect is very small. It is also believed that water-insoluble lipids and hydrocarbons can hinder cement hydration, but do not affect the final strength of the solidified soil. In addition, the early strength of cement-reinforced sludge is low and the strength development is slow, which affects construction efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a composite ternary system sludge solidifying agent, which aims to solve the problem of poor solidification effect of sludge solidifying agents in the prior art.

[0006] This invention is achieved through a method for preparing a composite ternary system sludge solidifying agent, comprising the following preparation methods:

[0007] 1) According to the weight fraction ratio, the following materials are prepared respectively: 30-40 parts of ternary cementitious material, 50-60 parts of mineral powder, 8-12 parts of alkali slag, 0.2-0.3 parts of polyacrylate emulsion, and 1-2 parts of styrene-acrylic emulsion;

[0008] 2) The ternary cementitious material, mineral powder, and alkaline slag are placed in a mixer and stirred to form material A;

[0009] 3) The polyacrylate emulsion, styrene-acrylic emulsion, and water are mixed and stirred to form material B;

[0010] 4) Place material A and material B in a mixer and stir to form a composite ternary system sludge solidification agent.

[0011] Optionally, in the preparation step 1), the ternary cementitious material is a mixture of silicate cement, sulfoaluminate cement and gypsum, wherein the silicate cement accounts for 40% to 60% by mass, the sulfoaluminate cement accounts for 25% to 45% by mass, and the gypsum accounts for 10% to 20% by mass.

[0012] Optionally, in preparation step 1), the silicate cement is a reference cement, which is made by grinding and calcining cement clinker and gypsum.

[0013] Optionally, in preparation step 1), the mineral powder is S95 grade mineral powder, and the mesh size of the mineral powder is greater than 200.

[0014] Optionally, in preparation step 1), the solid content of the polyacrylate emulsion is between 40% and 50%, the pH value of the polyacrylate emulsion is between 8.0 and 9.0, and the viscosity of the polyacrylate emulsion is between 230 and 250 cP.

[0015] Optionally, in preparation step 1), the solid content of the styrene-acrylic emulsion is 40% to 50%, the pH value of the styrene-acrylic emulsion is between 8.0 and 9.0, and the viscosity of the styrene-acrylic emulsion is between 230 and 250 cP.

[0016] Optionally, in preparation step 3), a set amount of water is placed in a stirring container, and two hollow tubes are inserted into the stirring container. The hollow tubes are spiraled. The hollow tubes have spiral cavities arranged along the axial direction of the hollow tubes. The bottom of the hollow tubes is closed, the top of the hollow tubes has a feed inlet, and the sidewalls of the hollow tubes have multiple sidewall holes that penetrate and communicate with the cavities.

[0017] In preparation step 3), the lower parts of the two hollow tubes are placed alternately in the water of the stirring container, with the side wall holes submerged in the water. During the rotation of the two hollow tubes, polyacrylate emulsion and styrene-acrylic emulsion are injected into the cavities of the two hollow tubes respectively. The polyacrylate emulsion and styrene-acrylic emulsion are ejected from the side wall holes and mixed with the water. The two hollow tubes simultaneously stir the polyacrylate emulsion, styrene-acrylic emulsion and water placed in the stirring container.

[0018] Optionally, the hollow tube has a spirally arranged curved section, the curved section having a downward-facing bottom sidewall, the sidewall hole being formed in the bottom sidewall and inclined downwards; the bottom of the hollow tube is provided with a plurality of stirring blades, the plurality of stirring blades being spaced apart along the circumference of the hollow tube; the inner end of the stirring blade is abutted against the bottom of the hollow tube, the outer end of the stirring blade is inclined outwards, and along the direction of the stirring blade from the inside to the outside, the stirring blade is inclined downwards;

[0019] In preparation step 3), during the rotation of the hollow tube, the polyacrylate emulsion and the styrene-acrylic emulsion are respectively sprayed out from the side wall holes at an angle downwards. The multiple stirring blades, through rotation, drive the downward-sprayed polyacrylate emulsion and styrene-acrylic emulsion to surge upwards.

[0020] Optionally, the inner end of the stirring blade is hinged to the bottom of the hollow tube, and a reset spring is provided between the middle part of the stirring blade and the hollow tube to drive the stirring blade to swing upward and reset; in the preparation step 3), when the hollow tube rotates, the stirring blade swings up and down with the change of rotation speed.

[0021] Optionally, the mixer is provided with a central shaft, which is arranged in a spiral shape from top to bottom; a linkage cylinder is sleeved around the outer periphery of the central shaft, and the linkage cylinder encloses and forms a mixing space, in which the central shaft is placed;

[0022] The inner wall of the linkage cylinder is provided with a curved rail groove, which is arranged in a closed manner along the circumference of the linkage cylinder and is curved along the axial direction of the linkage cylinder; a linkage shaft is connected to the central shaft, one end of the linkage shaft is hinged to the central shaft, and the other end of the linkage shaft is movably placed in the curved rail groove.

[0023] In preparation step 2), after the ternary cementitious material, mineral powder and alkali slag are placed in the linkage cylinder, the central shaft rotates and the other end of the linkage shaft moves along the curved track groove, driving the linkage cylinder to move up and down relative to the central shaft; the central shaft performs circumferential stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder, and the linkage cylinder performs axial stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder.

[0024] Compared with the prior art, the method for preparing a composite ternary system sludge solidifying agent provided by the present invention includes silicate cement, sulfoaluminate cement and gypsum as ternary cementitious materials, which undergo ternary system solidification, strengthen and densify the cement stone structure, and ensure the growth of cement strength in the later stage. The solidification of mineral powder and alkali slag is carried out through mineral powder and alkali slag solidification, which strengthens the entire solidification system and makes its later strength development good. The soil properties are improved by incorporating polyacrylate emulsion and styrene-acrylic emulsion polymer materials.

[0025] This allows the solidified sludge produced by this product to exhibit extremely rapid early-stage strength development, facilitating subsequent construction processes and improving construction efficiency in practical engineering. Furthermore, its good later-stage strength development ensures construction quality. The product's production process is simple, and its application is convenient. Because the prices of mineral powder and alkali slag are lower than those of ordinary Portland cement, the overall price is comparable to that of ordinary Portland cement. Moreover, the early and later-stage strength of the solidified sludge produced by this product is significantly higher than that of sludge solidified with cement hardeners. Attached Figure Description

[0026] Figure 1 This is a front view schematic diagram of the hollow tube provided by the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of the hollow tube provided by the present invention;

[0028] Figure 3 This is a front view schematic diagram of the stirring blade provided by the present invention;

[0029] Figure 4 This is a partial schematic diagram of the stirring space provided by the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0032] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] Reference Figure 1-4 The image shown is a preferred embodiment of the present invention.

[0034] The method for preparing the composite ternary system sludge solidifying agent provided by this invention includes the following preparation methods:

[0035] 1) According to the weight fraction ratio, the following materials are prepared respectively: 30-40 parts of ternary cementitious material, 50-60 parts of mineral powder, 8-12 parts of alkali slag, 0.2-0.3 parts of polyacrylate emulsion, and 1-2 parts of styrene-acrylic emulsion;

[0036] 2) Place the ternary cementitious material, mineral powder, and alkali slag into a mixer and mix them to form material A;

[0037] 3) Mix and stir the polyacrylate emulsion, styrene-acrylic emulsion, and water to form material B;

[0038] 4) Place material A and material B in a mixer and stir to form a composite ternary system sludge solidification agent.

[0039] The method for preparing the composite ternary system sludge solidifying agent provided above includes ternary cement, sulfoaluminate cement, and gypsum as the ternary cementing materials. These materials undergo ternary system solidification, which strengthens and densifies the cement stone structure, ensuring the growth of cement strength in the later stages. The solidification process, involving mineral powder and alkali slag, further enhances the entire solidification system and promotes good development of its later strength. The soil properties are improved by incorporating polyacrylate emulsion and styrene-acrylic emulsion polymers.

[0040] This allows the solidified sludge produced by this product to exhibit extremely rapid early-stage strength development, facilitating subsequent construction processes and improving construction efficiency in practical engineering. Furthermore, its good later-stage strength development ensures construction quality. The product's production process is simple, and its application is convenient. Because the prices of mineral powder and alkali slag are lower than those of ordinary Portland cement, the overall price is comparable to that of ordinary Portland cement. Moreover, the early and later-stage strength of the solidified sludge produced by this product is significantly higher than that of sludge solidified with cement hardeners.

[0041] The specific principles are as follows:

[0042] I. The solidification principle of the ternary system:

[0043] The silicate cement-sulfoaluminate cement-gypsum ternary system is characterized by its extremely fast reaction rate, enabling sludge to quickly solidify and acquire initial strength. Its reaction principle is as follows:

[0044] Silicate cement is the reference cement, and its main component is tricalcium silicate. Its hydration reaction is as follows:

[0045]

[0046] The above formula shows that the hydration products of tricalcium silicate are calcium silicate hydrate gel (CSH) and calcium hydroxide crystals. Tricalcium silicate hydrates relatively quickly and has high early strength.

[0047] dicalcium silicate ( Its hydration reaction is as follows:

[0048]

[0049] The hydration reaction of dicalcium silicate is similar to that of tricalcium silicate, but its reaction rate is particularly slow.

[0050] The main component of sulfoaluminate cement is anhydrous sulfoaluminate ( After its hydration reaction, it forms calcium vanadate, which is the main strength structure of cementitious materials in the early stage. The reaction between anhydrous sulfoaluminate and gypsum is as follows:

[0051]

[0052] In the alkaline environment generated by the hydration of tricalcium silicate and dicalcium silicate Continue reacting with plaster:

[0053]

[0054] In summary, gypsum and an alkaline environment can increase the hydration rate of anhydrous calcium sulfoaluminate, resulting in a needle-like structure of calcium vanadate. These needle-like crystals interlock to form a framework structure, while calcium silicate hydrate gel (CSH) fills the calcium vanadate crystals, reinforcing and densifying the cement stone structure and ensuring the later-stage strength growth of the cement.

[0055] II. Principle of mineral powder and alkaline slag solidification:

[0056] Alkaline slag solution provides an alkaline environment for the soil and is inexpensive. Mineral powder can be activated in this alkaline environment provided by the slag and cement hydration, causing calcium and magnesium ions on the surface of the mineral powder to generate calcium hydroxide and magnesium hydroxide under the influence of hydroxide ions, thus disrupting the vitreous structure. Simultaneously, sodium and potassium ions in the activator replace calcium and magnesium ions, connecting to Si-O and Al-O bonds, further damaging and decomposing the vitreous structure. At this point, calcium hydroxide reacts with dissolved active silica to form hydrated calcium silicate gel. The mineral powder reaction lags behind the ternary material reaction. The reaction products can fill the voids in the calcium vanadium skeleton system formed by the ternary material reaction, strengthening the entire solidification system and ensuring good later-stage strength development.

[0057] III. Polymer Admixtures:

[0058] Polyacrylate emulsion and styrene-acrylic emulsion polymers, when incorporated into soil, do not generate hydration products. This primarily improves soil properties in two ways;

[0059] (1) Thinning the double layer:

[0060] Modified soil incorporating polymer materials exhibits a shielding effect through adsorption of these materials onto the soil particle surface. This reduces the amount of water molecules adsorbed and simultaneously increases the concentration and valence of ions in the water, while decreasing the degree of ion hydration. These effects all reduce the thickness of the electrical double layer. A thinner double layer results in weaker hygroscopic capacity, thus separating the soil from water and enhancing soil strength.

[0061] (2) Enhance soil particle bonding:

[0062] Polymer materials can also form a spatial network structure in the soil, filling the pores and binding soil particles and aggregates, forming a physical and chemical bond with them, thereby improving soil strength and engineering performance.

[0063] Meanwhile, test blocks were prepared by reinforcing coastal silt with a moisture content of 70% to test the unconfined compressive strength of the test blocks. Test blocks prepared under the same conditions using PO 42.5R ordinary Portland cement were used as a control group. The test data are as follows:

[0064]

[0065] Specifically, in preparation step 1), the ternary cementitious material is a mixture of silicate cement, sulfoaluminate cement and gypsum, with the following mass percentages: silicate cement is between 40% and 60%, sulfoaluminate cement is between 25% and 45%, and gypsum is between 10% and 20%.

[0066] Thus, sulfoaluminate cement is rapid-hardening sulfoaluminate cement. Anhydrous gypsum can be used, but building gypsum and dihydrate gypsum can also be used. Three main points should be noted when choosing gypsum: first, select a relatively inexpensive type of gypsum; second, the gypsum should ideally be in powder form and free of free water; and third, adjust the gypsum ratio in the curing agent according to the mass percentage of sodium sulfate in the gypsum.

[0067] In preparation step 1), silicate cement is used as the reference cement, which is made by grinding and calcining cement clinker and gypsum. This makes its composition relatively clear. If ordinary silicate cement or other P.II cements are used, their composition will contain other materials such as mineral powder, quicklime, fly ash, and volcanic ash, which will affect the curing process and the proportion of components.

[0068] In preparation step 1), the mineral powder is S95 grade mineral powder with a mesh size greater than 200. This gives it good potential activation characteristics.

[0069] In preparation step 1), the solid content of the polyacrylate emulsion is between 40% and 50%, the pH value is between 8.0 and 9.0, and the viscosity is between 230 and 250 cP. Thus, it is a milky white liquid with a pale bluish tint.

[0070] In preparation step 1), the solid content of the styrene-acrylic emulsion is 40%~50%, the pH value is between 8.0 and 9.0, and the viscosity is between 230~250 cP. Thus, it is a milky white liquid with a pale bluish tint.

[0071] In this embodiment, in preparation step 3), a set amount of water is placed in a stirring container, and two hollow tubes 100 are inserted into the stirring container. The hollow tubes 100 are spiraled. The hollow tubes 100 have spiraled cavities 101, which are spiraled along the axial direction of the hollow tubes 100. The bottom of the hollow tubes 100 is closed, and the top of the hollow tubes 100 has a feed inlet. The sidewalls of the hollow tubes 100 have multiple sidewall holes 102, which penetrate and communicate with the cavities 101.

[0072] In preparation step 3), the lower parts of two hollow tubes 100 are placed in the water of the stirring container at intervals, and the side wall holes 102 are submerged in the water. During the process of driving the two hollow tubes 100 to rotate, polyacrylate emulsion and styrene-acrylic emulsion are injected into the cavity 101 of the two hollow tubes 100 respectively. The polyacrylate emulsion and styrene-acrylic emulsion are thrown out through the side wall holes 102 and mixed with the water. The two hollow tubes 100 simultaneously stir the polyacrylate emulsion, styrene-acrylic emulsion and water placed in the stirring container.

[0073] In this way, the polyacrylate emulsion and styrene-acrylic emulsion can be sprayed toward the water through multiple sidewall holes 102. Spraying from multiple sidewall holes 102 can make the polyacrylate emulsion and styrene-acrylic emulsion mix evenly with the water. Furthermore, the hollow tube 100 is in a spiral shape and is rotating, which plays a role in a large-scale stirring effect, promoting the rapid and uniform mixing of the polyacrylate emulsion and styrene-acrylic emulsion with the water.

[0074] In this embodiment, the hollow tube 100 has a coiled curved section with a downward-facing bottom sidewall. A sidewall hole 102 is formed in the bottom sidewall and is inclined downward. The bottom of the hollow tube 100 is provided with a plurality of stirring blades 110, which are spaced apart along the circumference of the hollow tube 100. The inner end of the stirring blade 110 is connected to the bottom of the hollow tube 100, and the outer end of the stirring blade 110 is inclined outward. Along the direction from the inside to the outside of the stirring blade 110, the stirring blade 110 is inclined downward.

[0075] In preparation step 3), during the rotation of the hollow tube 100, the polyacrylate emulsion and the styrene-acrylic emulsion are sprayed out downwards through the side wall holes 102, and the multiple stirring blades 110 drive the downward-sprayed polyacrylate emulsion and styrene-acrylic emulsion to surge upwards by rotating.

[0076] In this way, the stirring blades 110 drive some of the downward-flowing polyacrylate emulsion and styrene-acrylic emulsion to disperse upward, promoting uniform mixing.

[0077] The inner end of the stirring blade 110 is hinged to the bottom of the hollow tube 100, and a return spring 111 is provided between the middle of the stirring blade 110 and the hollow tube 100 to drive the stirring blade 110 to swing upward and return to its original position. In preparation step 3), when the hollow tube 100 rotates, the stirring blade 110 swings up and down with the change of rotation speed. Thus, when the hollow tube 100 rotates, since the stirring blade 110 is inclined outward, it has an upward driving force. Under the resistance of the liquid, the stirring blade 110 stirs upward, and at the same time, the return spring 111 realizes the return of the stirring blade 110. Therefore, with the change of acceleration, the stirring blade 110 swings up and down, causing the downward flowing polyacrylate emulsion and styrene-acrylic emulsion to disperse upward and promote uniform mixing.

[0078] The mixer is equipped with a central shaft 200, which is arranged in a spiral shape from top to bottom; a linkage cylinder is fitted around the outer periphery of the central shaft 200, and the linkage cylinder encloses and forms a mixing space, in which the central shaft 200 is placed.

[0079] The inner wall of the linkage cylinder is provided with a curved rail groove, which is arranged in a closed manner along the circumference of the linkage cylinder and is arranged in a curved manner along the axial direction of the linkage cylinder; a linkage shaft 210 is connected to the central shaft 200, one end of the linkage shaft 210 is hinged to the central shaft 200, and the other end of the linkage shaft 210 is movably placed in the curved rail groove.

[0080] In preparation step 2), after the ternary cementitious material, mineral powder and alkali slag are placed in the linkage cylinder, the central shaft 200 rotates and the other end of the linkage shaft 210 moves along the curved track, driving the linkage cylinder to move up and down relative to the central shaft 200; the central shaft 200 performs circumferential stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder, and the linkage cylinder performs axial stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder.

[0081] The spiral arrangement of the central shaft 200 effectively increases the mixing area. At the same time, the linkage shaft 210 is movably placed in the curved track 310. When the central shaft 200 rotates, the linkage shaft 210 moves along the curved track 310. Since the curved track 310 is curved along the axial direction, the linkage cylinder moves up and down relative to the central shaft 200, which greatly increases the mixing area. The linkage shaft 210 also plays a mixing role. Furthermore, since the linkage shaft 210 and the central shaft 200 are hinged, the maximum range of vertical movement of the linkage cylinder is further increased.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a composite ternary system sludge solidification agent, characterized in that, The preparation methods include the following: 1) According to the weight fraction ratio, the following materials are prepared respectively: 30-40 parts of ternary cementitious material, 50-60 parts of mineral powder, 8-12 parts of alkali slag, 0.2-0.3 parts of polyacrylate emulsion, and 1-2 parts of styrene-acrylic emulsion; 2) The ternary cementitious material, mineral powder, and alkaline slag are placed in a mixer and stirred to form material A; 3) The polyacrylate emulsion, styrene-acrylic emulsion, and water are mixed and stirred to form material B; 4) Place material A and material B in a mixer and stir to form a composite ternary system sludge solidification agent; In the preparation step 1), the ternary cementitious material is made by mixing silicate cement, sulfoaluminate cement and gypsum. According to the mass ratio, the silicate cement is between 40% and 60%, the sulfoaluminate cement is between 25% and 45%, and the gypsum is between 10% and 20%. In preparation step 3), a set amount of water is placed in a stirring container, and two hollow tubes are inserted into the stirring container. The hollow tubes are spiraled. The hollow tubes have spiral cavities arranged along the axial direction of the hollow tubes. The bottom of the hollow tubes is closed, the top of the hollow tubes has a feed inlet, and the sidewalls of the hollow tubes have multiple sidewall holes that penetrate and communicate with the cavities. In preparation step 3), the lower parts of the two hollow tubes are placed alternately in the water of the stirring container, with the side wall holes submerged in the water. During the rotation of the two hollow tubes, polyacrylate emulsion and styrene-acrylic emulsion are injected into the cavities of the two hollow tubes respectively. The polyacrylate emulsion and styrene-acrylic emulsion are ejected from the side wall holes and mixed with the water. The two hollow tubes simultaneously stir the polyacrylate emulsion, styrene-acrylic emulsion, and water placed in the stirring container. The hollow tube has a spirally arranged curved section, the curved section has a downward-facing bottom sidewall, the sidewall hole is formed in the bottom sidewall and is inclined downward; the bottom of the hollow tube is provided with a plurality of stirring blades, the plurality of stirring blades are arranged at intervals along the circumference of the hollow tube; the inner end of the stirring blade is connected to the bottom of the hollow tube, the outer end of the stirring blade is inclined outward, and along the direction of the stirring blade from the inside to the outside, the stirring blade is inclined downward. In the preparation step 3), during the rotation of the hollow tube, the polyacrylate emulsion and the styrene-acrylic emulsion are respectively sprayed out from the side wall holes at an angle downwards. The multiple stirring blades rotate to drive the downward-sprayed polyacrylate emulsion and styrene-acrylic emulsion to surge upwards. In preparation step 2), the mixer is provided with a central shaft, which is arranged in a spiral shape from top to bottom; a linkage cylinder is sleeved on the outer periphery of the central shaft, which encloses and forms a mixing space, and the central shaft is placed in the mixing space; The inner wall of the linkage cylinder is provided with a curved rail groove, which is arranged in a closed manner along the circumference of the linkage cylinder and is curved along the axial direction of the linkage cylinder; a linkage shaft is connected to the central shaft, one end of the linkage shaft is hinged to the central shaft, and the other end of the linkage shaft is movably placed in the curved rail groove. In preparation step 2), after the ternary cementitious material, mineral powder and alkali slag are placed in the linkage cylinder, the central shaft rotates and the other end of the linkage shaft moves along the curved track groove, driving the linkage cylinder to move up and down relative to the central shaft; the central shaft performs circumferential stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder, and the linkage cylinder performs axial stirring on the ternary cementitious material, mineral powder and alkali slag placed in the linkage cylinder.

2. The method for preparing the composite ternary system sludge solidification agent as described in claim 1, characterized in that, In preparation step 1), the mineral powder is S95 grade mineral powder with a mesh size greater than 200.

3. The method for preparing the composite ternary system sludge solidification agent as described in claim 1, characterized in that, In preparation step 1), the solid content of the polyacrylate emulsion is between 40% and 50%, the pH value of the polyacrylate emulsion is between 8.0 and 9.0, and the viscosity of the polyacrylate emulsion is between 230 and 250 cP.

4. The method for preparing the composite ternary system sludge solidification agent as described in claim 1, characterized in that, In preparation step 1), the solid content of the styrene-acrylic emulsion is 40%~50%, the pH value of the styrene-acrylic emulsion is between 8.0 and 9.0, and the viscosity of the styrene-acrylic emulsion is between 230 and 250 cP.

5. The method for preparing the composite ternary system sludge solidification agent according to any one of claims 1-4, characterized in that, The inner end of the stirring blade is hinged to the bottom of the hollow tube, and a reset spring is provided between the middle part of the stirring blade and the hollow tube to drive the stirring blade to swing upward and reset; in the preparation step 3), when the hollow tube rotates, the stirring blade swings up and down with the change of rotation speed.

Images