Slag-gold tailing all-solid-waste curing agent for marine soft soil curing and preparation method of slag-gold tailing all-solid-waste curing agent
By preparing a slag-gold tailings full solid waste solidifier and utilizing the mixed reaction of slag, gold tailings, carbide slag and sodium sulfate to generate a gel material, the settlement and stability problems of marine soft soil were solved, achieving efficient solid waste resource utilization and low-carbon reinforcement effects.
Patent Information
- Application Number
- CN202510987256.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-09-16
AI Technical Summary
Marine soft soil is prone to large settlement, low bearing capacity and poor stability when not reinforced. Traditional reinforcement methods have high energy consumption, serious pollution and solid waste disposal occupying land resources, making it difficult to achieve efficient resource utilization.
Slag, gold tailings, carbide slag and sodium sulfate are used as the main raw materials, and a full solid waste solidifier is prepared through physical and chemical excitation mixing. It is used for the solidification of marine soft soil, generating gel material to fill soil pores and enhance the integrity and density of the soil.
It has achieved effective solidification of marine soft soil, improved its strength and deformation properties, reduced carbon emissions, realized the resource utilization of industrial solid waste, and reduced dependence on natural resources.
Smart Images
Figure FT_1 
Figure SMS_1 
Figure SMS_2
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of soil solidifiers and relates to a slag-gold tailings full-solid waste solidifier for solidifying marine soft soil and a preparation method thereof. Background Art
[0002] Marine soft soil is widely distributed in my country's coastal plains, estuary deltas and other areas. It is mainly composed of fine-grained soil and has the characteristics of high compressibility, high water content, low permeability and low strength. If it is not treated and directly used in large-scale engineering construction, it is prone to problems such as large settlement, low bearing capacity and poor stability. The traditional reinforcement treatment method can use cement to reinforce it. Although it can achieve good reinforcement effects, it has problems such as high energy consumption, high emissions and serious environmental pollution. Based on this, the development of new composite curing materials for marine soft soil reinforcement with high performance, low energy consumption and low carbon emissions to achieve the modification and improvement of the mechanical properties of marine soft soil has important scientific significance and engineering value.
[0003] On the other hand, industrial production processes generate large quantities of solid waste materials, such as slag and gold tailings. To protect the environment and achieve sustainable development, there is an urgent need to address the recycling of these bulk solid wastes. Currently, these wastes are often treated using traditional methods such as stacking and landfilling, which not only consume significant land resources but also pose environmental risks. Therefore, the large quantities of solid waste materials, such as slag and gold tailings, generated during industrial production processes urgently need to be recycled and utilized. Summary of the Invention
[0004] The purpose of the present invention is to provide a slag-gold tailings full solid waste solidifying agent for solidifying marine soft soil and a preparation method thereof.
[0005] The present invention utilizes slag and gold tailings as the main raw materials, supplemented with auxiliary materials such as calcium carbide slag and sodium sulfate, through scientific and reasonable proportioning, and through physical excitation and chemical excitation mixing to prepare an all-solid waste curing agent, thereby achieving effective curing of marine soft soil and resource utilization of solid waste; it is used to improve the strength and deformation properties of marine soft soil and use all-solid waste materials instead of cement to reduce carbon emissions.
[0006] The present invention provides a slag-gold tailings full-solid waste solidifying agent for solidifying marine soft soil, comprising the following components in parts by weight: 14-36 parts of slag, 14-36 parts of gold tailings, 7-18 parts of carbide slag, and 24 parts of sodium sulfate.
[0007] The above-mentioned slag-gold tailings full solid waste solidifying agent for marine soft soil solidification comprises the following components in parts by weight: 18 to 36 parts of slag, 18 to 36 parts of gold tailings, 7.2 to 18 parts of carbide slag, and 24 parts of sodium sulfate.
[0008] In the present invention, the slag-gold tailings solid waste solidifying agent for marine soft soil solidification is specifically composed of the following components in parts by weight of any one of items 1) to 7): 1) 18 parts of slag; 30 parts of gold tailings; 9 parts of carbide slag; 24 parts of sodium sulfate; 2) 30 parts of slag; 30 parts of gold tailings; 9 parts of carbide slag; 24 parts of sodium sulfate; 3) 36 parts of slag; 30 parts of gold tailings; 9 parts of carbide slag; 24 parts of sodium sulfate; 4) 36 parts of slag; 18 parts of gold tailings; 9 parts of carbide slag; 24 parts of sodium sulfate; 5) 36 parts of slag; 36 parts of gold tailings; 9 parts of carbide slag; 24 parts of sodium sulfate; 6) 36 parts of slag; 30 parts of gold tailings; 18 parts of carbide slag; 24 parts of sodium sulfate; 7) 36 parts of slag; 30 parts of gold tailings; 9 parts of carbide slag; 30 parts of sodium sulfate.
[0009] In the above-mentioned slag-gold tailings all-solid waste solidifying agent for marine soft soil solidification, the slag may be S95 grade slag, the particle size may be 800 mesh to 1250 mesh, the density may be 2.8 g / cm³ to 2.9 g / cm³, and the specific surface area may be 400 m² / kg to 500 m² / kg; the slag may undergo hydration reaction in an alkaline environment to generate CSH gel, C-(A)-SH gel and other hydration products; in a specific embodiment, the slag may be S95 grade slag, the particle size may be 800 mesh, the density may be 2.87 g / cm³, and the specific surface area may be 432.9 m² / kg.
[0010] In the aforementioned slag-gold tailings all-solid waste solidifying agent for marine soft soil solidification, the gold tailings can contain 65% to 70% silicon oxide by weight and 15% to 20% aluminum oxide by weight. In an alkaline environment, the gold tailings depolymerize to produce active silicon oxide and active aluminum oxide, which react to form gelling substances such as CSH. The addition of gold tailings effectively improves the shrinkage properties of CSH, facilitating its subsequent hydration.
[0011] In the above-mentioned slag-gold tailings solid waste solidifying agent for solidifying marine soft soil, the mass percentage of calcium oxide in the carbide slag can be 65% to 75%; The fine particles in the carbide slag can account for 99.47% to 99.99%, and the unevenness coefficient is 5 to 6; the particle size of the fine particles can be 50 mesh to 1600 mesh; the carbide slag can provide an alkaline environment and a large amount of Ca for the reaction between slag and gold tailings. 2+ , which is beneficial to the improvement of curing strength.
[0012] In the present invention, the sodium sulfate is industrial-grade anhydrous sodium sulfate, and the content of sodium sulfate is not less than 99%. Sodium sulfate provides sulfate ions to react with hydration products such as CSH to form ettringite, further improving the curing strength.
[0013] The present invention also provides a method for preparing the above-mentioned slag-gold tailings solid waste solidifying agent for solidifying marine soft soil, comprising the following steps: 1) Grinding, drying, and sieving the slag, the gold tailings, and the carbide slag to obtain respective solid waste powders; 2) mixing the solid waste powder and the sodium sulfate to obtain a curing agent dry material; 3) Mixing and stirring the solidifying agent dry material and water to obtain the slag-gold tailings full solid waste solidifying agent for soft soil solidification.
[0014] In the present invention, in step 2), the solid waste powder and the sodium sulfate are added into a blender and slowly stirred for 2 minutes until uniform.
[0015] In the above-mentioned method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification, the grinding adopts a planetary ball mill, and the grinding time can be 60 to 80 minutes; The drying time can be 22 to 24 hours; The sieved particle size may be 0.05 mm to 0.075 mm.
[0016] In the above-mentioned method for preparing the slag-gold tailings solid waste solidifying agent for solidifying marine soft soil, the mass ratio of the water to the solidifying agent dry material can be 42-45:100, specifically 44.3:100.
[0017] In the above-mentioned method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification, in step 2), the mixing is carried out by stirring at a rate of 135-145 rpm for a time of 1.5-2.5 min; In step 3), the mixing and stirring process is as follows: stirring at a rate of 135-145 rpm for 0.5-1.5 min, and then stirring at a rate of 275-295 rpm for 4.5-5.5 min.
[0018] In the present invention, step 1) can reduce the particle size of the slag and gold tailings by mechanical grinding, increase their specific surface area, and use grinding for physical excitation to reduce the relative crystallinity of the main mineral phase and improve its reactivity in an alkaline environment; Through the proportion of various raw materials, when slag and gold tailings solidify soft soil, hydration reaction, volcanic ash reaction, metal cation exchange, agglomeration and other reactions will occur through chemical stimulation of carbide slag and sodium sulfate, generating gel material to fill the soil pores or wrap soil particles, reducing the distance between soil particles and agglomerating them, thereby enhancing the integrity and density of the solidified soil.
[0019] The slag-gold tailings full solid waste solidifying agent for solidifying marine soft soil of the present invention is applied to the solidification of high marine soft soil.
[0020] The present invention also provides a method for solidifying marine soft soil using the above-mentioned slag-gold tailings all-solid waste solidifying agent for solidifying marine soft soil, comprising the following steps: mixing the above-mentioned slag-gold tailings all-solid waste solidifying agent for solidifying soft soil with marine soft soil to react, thereby solidifying the marine soft soil and obtaining solidified soil.
[0021] In the present invention, the slag-gold tailings solid waste solidifying agent for soft soil solidification is mixed with marine soft soil and undergoes reactions such as hydration reaction, volcanic ash reaction, metal cation exchange, and granulation to form solidified soil.
[0022] The present invention has the following beneficial effects: 1. The present invention can reduce the particle size of slag and gold tailings through mechanical grinding, increase their specific surface area, reduce the relative crystallinity of the main mineral phase, and improve their reaction activity in an alkaline environment.
[0023] 2. When slag and gold tailings solidify soft soil, hydration reaction, volcanic ash reaction, metal cation exchange, agglomeration and other reactions will occur, generating gel substances that fill the soil pores or wrap the soil particles, reducing the distance between soil particles and agglomerating them, thereby enhancing the integrity and density of the solidified soil.
[0024] 3. Slag and gold tailings can also generate complementary hydration products to fill the honeycomb C-(A)-SH gel, further improving the performance of the curing system.
[0025] 4. The present invention uses all-solid waste materials to replace cement for soft soil solidification, realizes the high-value utilization of industrial solid waste, reduces dependence on natural resources, effectively strengthens and utilizes solid waste as a resource, improves the density and strength of marine soft soil, reduces its compressibility, and greatly reduces carbon emissions, meeting the "dual carbon" goal requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 The present invention is a flow chart of a method for preparing a slag-gold tailings all-solid waste solidifying agent for solidifying marine soft soil. DETAILED DESCRIPTION
[0027] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.
[0028] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.
[0029] The present invention provides a slag-gold tailings full-solid waste solidifying agent for solidifying marine soft soil, comprising the following components in parts by weight: 14-36 parts of slag, 14-36 parts of gold tailings, 7-18 parts of carbide slag, and 24 parts of sodium sulfate.
[0030] The present invention also provides a method for preparing the above-mentioned slag-gold tailings solid waste solidifying agent for solidifying marine soft soil, comprising the following steps: 1) Grinding, drying, and sieving the slag, the gold tailings, and the carbide slag to obtain respective solid waste powders; 2) adding the solid waste powder and the sodium sulfate into a blender and slowly stirring at a speed of 135-145 rpm for 1.5-2.5 minutes until uniform, to obtain a curing agent dry material; 3) Adding the curing agent dry material and water into a mixer, slowly stirring at a rate of 135-145 rpm for 0.5-1.5 minutes, and then rapidly stirring at a rate of 275-295 rpm for 4.5-5.5 minutes until the mixture is uniformly mixed, thereby obtaining the slag-gold tailings full-solid waste curing agent for soft soil curing.
[0031] The chemical compositions of the slag, gold tailings and carbide slag used in the present invention are shown in Table 1.
[0032] Table 1 Chemical composition of materials
[0033] The marine soft soil used in the present invention was taken from a construction site at the seaside, with a burial depth of 5m-7m. Its basic parameters are shown in Table 2.
[0034] Table 2 Basic parameters of marine soft soil
[0035] The marine soft soil used in the following examples is all treated marine soft soil. The specific treatment process is as follows: before preparing the specimens, the original marine soft soil is first dried, crushed, and sieved. The original marine soft soil is placed in an oven at 105°C for 8 hours, crushed after drying, and then sieved through a 2 mm sieve to remove hard particles.
[0036] In the following examples, the sodium sulfate used is industrial-grade anhydrous sodium sulfate, with a sodium sulfate content of not less than 99%. Sodium sulfate provides sulfate ions that react with hydration products such as CSH to form ettringite, further enhancing the curing strength.
[0037] Example 1 (1) Take 18 parts of slag, 30 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0038] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0039] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0040] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0041] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0042] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0043] Example 2 (1) Take 30 parts of slag, 30 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0044] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0045] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0046] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0047] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0048] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0049] Example 3 (1) Take 36 parts of slag, 30 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0050] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0051] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0052] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0053] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0054] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0055] Example 4 (1) Take 36 parts of slag, 18 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0056] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0057] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0058] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0059] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0060] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0061] Example 5 (1) Take 36 parts of slag, 36 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0062] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0063] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0064] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0065] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0066] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0067] Example 6 (1) Take 36 parts of slag, 30 parts of gold tailings, and 18 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0068] (2) Take 24 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a blender and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0069] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the dry curing agent and water into the mixer and stir slowly at 140 rpm for 1 min, then stir quickly at 280 rpm for 5 min until the mixture is evenly mixed, thereby preparing the slag-gold tailings solid waste curing agent for marine soft soil curing.
[0070] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0071] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0072] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0073] Example 7 (1) Take 36 parts of slag, 30 parts of gold tailings, and 9 parts of calcium carbide slag, respectively, and put them into a planetary ball mill for 80 minutes. The ball-milled materials are sieved through a 0.5 mm sieve to obtain solid waste powder.
[0074] (2) Take 30 parts of sodium sulfate, add the solid waste powder and sodium sulfate into a mixer in sequence, and stir slowly at 140 rpm for 2 minutes until uniform, to obtain a curing agent dry material.
[0075] (3) Weigh 44.3% of the mass of the soft soil with fresh water, add the curing agent dry material and water into the mixer in sequence, stir slowly at a rate of 140 rpm for 1 min, and then stir quickly at a rate of 280 rpm for 5 min until the mixture is evenly mixed, ensuring that the materials are evenly mixed, and prepare the slag-gold tailings full solid waste curing agent for marine soft soil curing.
[0076] This example also conducted a performance test on solidifying marine soft soil with a full solid waste solidifying agent: Weigh 300 parts of the treated marine soft soil and pour it into a mixer, then add the curing agent into the mixer and stir until the mixture is uniform.
[0077] The mixed solidified soil was loaded into a 50 mm x 100 mm mold in three batches and placed in a curing box for 24 hours before removal from the mold. The molded specimen was then placed in the curing box for another 7 days. The curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0078] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0079] Comparative Example 1 This comparative example only uses ordinary Portland cement as a curing agent.
[0080] 300 parts of the treated marine soft soil were weighed and poured into a mixer. 44.3% of the mass of the soft soil and 60 parts of ordinary Portland cement were weighed and added into the mixer and stirred at a speed of 140 rpm until uniformly mixed.
[0081] The mixed solidified soil was loaded into 50 mm x 100 mm molds in three batches, numbered, and placed in a curing box for 24 hours before removal from the molds. The molded specimens were then placed in the curing box for another 7 days. Curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0082] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0083] Comparative Example 2 This comparative example only uses ordinary Portland cement as a curing agent.
[0084] 300 parts of the treated marine soft soil were weighed and poured into a mixer. 44.3% of the mass of the soft soil and 75 parts of ordinary Portland cement were weighed and added into the mixer and stirred at a speed of 140 rpm until uniformly mixed.
[0085] The mixed solidified soil was loaded into 50 mm x 100 mm molds in three batches, numbered, and placed in a curing box for 24 hours before removal from the molds. The molded specimens were then placed in the curing box for another 7 days. Curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0086] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0087] Comparative Example 3 This comparative example only uses ordinary Portland cement as a curing agent.
[0088] 300 parts of the treated marine soft soil were weighed and poured into a mixer. 44.3% of the mass of the soft soil and 90 parts of ordinary Portland cement were weighed and added into the mixer and stirred at a speed of 140 rpm until uniformly mixed.
[0089] The mixed solidified soil was loaded into 50 mm x 100 mm molds in three batches, numbered, and placed in a curing box for 24 hours before removal from the molds. The molded specimens were then placed in the curing box for another 7 days. Curing conditions were relative humidity ≥ 95% and temperature controlled at (20 ± 2)°C.
[0090] After curing to the standard age, an unconfined compressive strength test is carried out using an electronic universal testing machine. When the load reaches the peak value, continue to pressurize the specimen until it undergoes another 2% to 4% axial deformation and then stop.
[0091] The 7d unconfined compressive strength of the embodiments of the present invention and the comparative examples are shown in Table 3.
[0092] The results in Table 3 show that the addition of 12 parts of slag from Example 1 to Example 2 increased the 7-day unconfined compressive strength by approximately 10%; the addition of 18 parts of slag from Example 1 to Example 3 increased the 7-day unconfined compressive strength by approximately 15%; the addition of 12 parts of gold tailings from Example 4 to Example 3 increased the 7-day unconfined compressive strength by approximately 9%; the addition of 9 parts of carbide slag from Example 3 to Example 6 increased the 7-day unconfined compressive strength by approximately 7%; and the addition of 6 parts of sodium sulfate from Example 3 to Example 7 increased the 7-day unconfined compressive strength by approximately 13%. At similar curing agent dosages, Example 4 increased the strength by approximately 21% compared to Comparative Example 3. According to the results of various examples by those skilled in the art, a 7-day unconfined compressive strength of soft soil solidified with solid waste materials greater than 1.5 MPa is considered a composite requirement, and therefore Examples 2, 3, 5, 6, and 7 are considered to be more effective.
[0093] Table 3 Compressive strength test results
[0094] In summary, the slag-gold tailings all-solid waste solidifying agent prepared in the present invention is applied to solidify marine soft soil, which can significantly improve the strength of marine soft soil.
Claims
1. A slag-gold tailings solid waste solidifying agent for solidifying marine soft soil, characterized in that: The invention comprises the following components in parts by weight: 14 to 36 parts of slag, 14 to 36 parts of gold tailings, 7 to 18 parts of carbide slag and 24 parts of sodium sulfate.
2. The slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 1, characterized in that: The slag-gold tailings all-solid waste solidifying agent for soft soil solidification comprises the following components in parts by weight: 18-36 parts of slag, 18-36 parts of gold tailings, 7.2-18 parts of carbide slag, and 24 parts of sodium sulfate.
3. The slag-gold tailings solid waste solidifying agent for soft soil solidification according to claim 1 or 2, characterized in that: The slag is S95 grade slag, has a particle size of 800 mesh to 1250 mesh, a density of 2.8 g / cm³ to 2.9 g / cm³, and a specific surface area of 400 m² / kg to 500 m² / kg.
4. The slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 1 or 2, characterized in that: The mass percentage of silicon oxide in the gold tailings is 65% to 70%, and the mass percentage of aluminum oxide is 15% to 20%.
5. The slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 1 or 2, characterized in that: The mass percentage of calcium oxide in the carbide slag is 65% to 75%; The fine particles in the carbide slag account for 99.47% to 99.99%, and the unevenness coefficient is 5 to 6; the particle size of the fine particles is 50 mesh to 1600 mesh.
6. The method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to any one of claims 1 to 5, characterized in that: The steps include: 1) Grinding, drying, and sieving the slag, the gold tailings, and the carbide slag to obtain respective solid waste powders; 2) mixing the solid waste powder and the sodium sulfate to obtain a curing agent dry material; 3) Mixing and stirring the solidifying agent dry material and water to obtain the slag-gold tailings full solid waste solidifying agent for soft soil solidification.
7. The method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 6, characterized in that: In step 1), the grinding is carried out using a planetary ball mill, and the grinding time is 60 to 80 minutes; The drying time is 20 to 24 hours; The sieved particle size is 0.05mm~0.075mm.
8. The method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 6 or 7, characterized in that: In step 3), the mass ratio of the water to the curing agent dry material is 42-45:
100.
9. The method for preparing the slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to claim 6 or 7, characterized in that: In step 2), the mixing is performed by stirring at a rate of 135 to 145 rpm for 1.5 to 2.5 min; In step 3), the mixing and stirring process is as follows: stirring at a rate of 135-145 rpm for 0.5-1.5 min, and then stirring at a rate of 275-295 rpm for 4.5-5.5 min.
10. A method for solidifying marine soft soil using the slag-gold tailings solid waste solidifying agent for marine soft soil solidification according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: mixing the slag-gold tailings solid waste solidifying agent for soft soil solidification with marine soft soil to react, thereby solidifying the marine soft soil and obtaining solidified soil.