Early-strength curing agent based on all-source solid and liquid wastes as well as preparation method and application of early-strength curing agent

Abstract

The invention relates to the technical field of geotechnical engineering and constructional engineering, and provides an early-strength curing agent based on all-source solid and liquid wastes as well as a preparation method and application thereof. The curing agent comprises 5.0 to 8.0 parts of asbestos waste, 4.5 to 5.5 parts of sugar production waste residue filter mud, 75 to 80 parts of granulated blast furnace slag, 4.0 to 5.0 parts of desulfurized gypsum, 5.5 to 7.5 parts of salt lake lithium extraction waste residue, 20 to 30 parts of waste alkali liquid and 70 to 80 parts of water. The salt lake lithium extraction waste residue excites the early reaction of the granulated blast-furnace slag and the desulfurized gypsum, and the early strength of the curing agent is improved; magnesium-containing compounds in the asbestos waste and the sugar production waste residue filter mud provide water-retaining property, so that the problems that the solidified soil is easy to dry and shrink and poor in water resistance are solved; an alkaline environment is provided by waste alkali liquor, and the problem that the curing agent is easily influenced by the environment is solved; the raw materials of the curing agent are from solid and liquid wastes, so that resource utilization of industrial solid wastes is realized, and a low-carbon cementing material is developed.

Description

Technical Field

[0001] This invention relates to the fields of geotechnical engineering and building engineering, specifically to an early-strength curing agent based on all-source solid and liquid waste, its preparation method, and its application. Background Technology

[0002] Soil stabilizers are chemical agents that bind soil particles together, thereby improving soil strength and stability. They alter soil properties through physical, chemical, or physicochemical processes, transforming loose soil into a hardened body with a certain strength and durability. The active ingredients in soil stabilizers react with the surface of soil particles to form a cementing substance that binds the soil particles together, thus increasing the soil's compressive and shear strength. In road construction, treating the subgrade with soil stabilizers can improve its bearing capacity, reduce settlement and deformation under vehicle loads, and extend the road's service life.

[0003] Solidified soil exhibits improved water resistance and freeze-thaw resistance, enabling it to withstand damage from external environmental factors and reducing soil erosion and loosening. The solidifying agent fills the pores between soil particles, reducing soil permeability and preventing soil softening and erosion caused by water infiltration. In water conservancy projects, it is used for canal slope protection and dam reinforcement, effectively preventing water flow from eroding and damaging the soil, thus improving the stability and safety of the water conservancy project.

[0004] Currently, commonly used soil stabilizers include inorganic and organic types. Inorganic stabilizers mainly consist of cement, lime, fly ash, etc. For example, patent CN202411041627 discloses an alkali-activated soil stabilizer and its preparation method, which, by weight, includes the following raw materials: 20-25 parts cement, 70-80 parts mineral admixtures, 13-16 parts alkaline activator, 4-8 parts wollastonite powder, 0.3-0.8 parts fiber, and 3-7 parts modified chitosan. However, this stabilizer has low early strength, the stabilized soil is prone to drying shrinkage, and its water stability is poor.

[0005] Organic soil stabilizers include polymeric compounds and ionic compounds. For example, patent CN201510266611 discloses a polymeric organic soil stabilizer and its synthesis method. The stabilizer consists of 2-6 parts magnesium chloride, 4-8 parts calcium chloride, 0.3-0.8 parts calcium oxide, 0.3-0.8 parts magnesium oxide, 3-8 parts acrylamide, 0.1-0.4 parts ammonium persulfate, 0.2-0.6 parts potassium persulfate, 10-20 parts soluble cellulose, 5-15 parts sodium carboxymethyl cellulose, 0.5-1 part sodium hydroxide, and 50-70 parts water. However, this stabilizer has poor water resistance, is easily affected by the environment, and some organic stabilizers suffer from aging problems.

[0006] Patent CN202510559602 discloses a roadbed soil cementitious material curing agent and its application method. The curing agent includes: silicate cement, coal gangue particles, fly ash, silica fume, impermeability enhancer, water-reducing agent and fiber. The impermeability enhancer is prepared by the following method: (1) Disperse polyaluminum sulfate powder in anhydrous ethanol, then add silane coupling agent and hydrophobic agent, and heat and keep warm under stirring conditions. After completion, separate the solid matter to obtain modified polyaluminum sulfate. (2) Add modified polyaluminum sulfate to water and heat and keep warm under stirring conditions. After completion, evaporate to dryness to remove water, and grind the obtained solid product. However, the production process of this curing agent raw material will consume a lot of energy and resources, and generate pollutants such as wastewater, waste gas and waste residue, which will impose a certain burden on the environment. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an early-strength curing agent based on all-source solid and liquid waste, along with its preparation method and application. This solves the problems of low early strength of the curing agent, easy drying and shrinkage of the cured soil, susceptibility of the curing agent to environmental influences, poor water resistance, and environmental unfriendliness.

[0008] According to a first aspect of the present invention, the present invention provides an early-strength curing agent based on all-source solid and liquid waste, comprising the following components by mass parts:

[0009]

[0010]

[0011] The solid waste components include asbestos waste, sugar refining residue filter mud, granulated blast furnace slag, desulfurization gypsum, and lithium extraction residue from salt lakes. The liquid waste components include waste alkali solution and water.

[0012] In some embodiments, asbestos waste refers to asbestos dust and waste asbestos generated during the production of asbestos products; the components of asbestos waste include silicon dioxide, magnesium oxide, and water of crystallization.

[0013] The mineral composition of asbestos waste is serpentine, with the molecular formula Mg3[Si2O5][OH]4 or Mg6[Si4O 10 ][OH]8.

[0014] In some embodiments, the mass ratio of silicon dioxide to magnesium oxide is 1:1, and the total mass of silicon dioxide and magnesium oxide accounts for more than 80% of the mass of asbestos waste.

[0015] In some embodiments, the sugar refining waste filter mud is a solid waste obtained by harmlessly treating sugar refining waste using the carbonation method;

[0016] In some embodiments, the components of the sugar refining waste filter mud include calcium carbonate, magnesium carbonate, silicon dioxide, and aluminum oxide; the mass percentage of calcium carbonate is 70% to 90%, the mass percentage of magnesium carbonate is 1% to 10%, the mass percentage of silicon dioxide is 2% to 6%, and the mass percentage of aluminum oxide is 1% to 4%.

[0017] In some embodiments, the components of the sugar refining waste filter mud include calcium carbonate, magnesium carbonate, silicon dioxide, and aluminum oxide; the mass percentage of calcium carbonate is 70% to 85%, the mass percentage of magnesium carbonate is 1% to 10%, the mass percentage of silicon dioxide is 2% to 6%, and the mass percentage of aluminum oxide is 1% to 4%.

[0018] In some embodiments, granulated blast furnace slag is waste slag generated during the blast furnace smelting of pig iron in an ironmaking plant; the grade of granulated blast furnace slag is S95 grade of GB / T 18046-2017 "Granulated blast furnace slag powder for use in cement, mortar and concrete".

[0019] In some embodiments, the granulated blast furnace slag comprises calcium oxide, silicon dioxide, aluminum oxide, and magnesium oxide; the mass percentage of calcium oxide is 45% to 50%, the mass percentage of silicon dioxide is 25% to 30%, the mass percentage of aluminum oxide is 15% to 20%, and the mass percentage of magnesium oxide is 8% to 12%.

[0020] In some embodiments, the desulfurization gypsum is a solid waste generated when a coal-fired power plant uses a limestone-lime wet flue gas desulfurization process; the component of the desulfurization gypsum is calcium sulfate dihydrate.

[0021] In some implementations, lithium extraction waste from salt lakes refers to insoluble solid waste precipitated from salt lake brine during the evaporation and concentration process.

[0022] In some embodiments, the components of lithium extraction waste from salt lakes include lithium carbonate and calcium sulfate; the mass ratio of lithium carbonate to calcium sulfate is 5-20:5-30.

[0023] In some embodiments, the waste alkali solution is a liquid waste generated during the cooking process in the alkaline pulping process;

[0024] In some embodiments, the waste alkaline solution comprises lignin, sodium hydroxide, and water; in the waste alkaline solution, the mass percentage concentration of lignin is 3% to 12%, and the mass percentage concentration of sodium hydroxide is 2% to 8%.

[0025] According to a second aspect of the present invention, the present invention provides a method for preparing an early-strength curing agent based on all-source solid and liquid waste; the method includes the following steps:

[0026] Asbestos waste, sugar refining waste filter mud, granulated blast furnace slag, desulfurized gypsum, and lithium extraction waste from salt lakes are mixed thoroughly, then waste alkali solution is added, mixed thoroughly, allowed to stand, and then water is added and mixed thoroughly to obtain the early-strength curing agent based on all-source solid and liquid waste. In the preparation of the early-strength curing agent based on all-source solid and liquid waste, waste alkali solution needs to be added first, followed by water.

[0027] In some implementations, the settling time is 6-12 hours.

[0028] According to the third method of the present invention, the present invention provides the application of an early-strength solidifying agent based on all-source solid and liquid waste in soil solidification.

[0029] In some implementations, the mass of the early-strength solidifying agent based on all-source solid and liquid waste is 5% to 20% of the soil mass.

[0030] Compared with the prior art, the present invention has the following beneficial effects and advantages:

[0031] (1) The early-strength curing agent based on solid and liquid waste provided by the present invention has the effects of high early strength, easy curing and strong water resistance. Among them, due to the early rapid reaction of granulated blast furnace slag and desulfurized gypsum under the activating effect of lithium extraction waste in salt lake, ettringite is generated, which has significant early strength. It completes the initial hardening in 1 day, 80% of the final strength in 2 days, and 95% of the final strength in 7 days. At the same time, the magnesium-containing compounds in asbestos waste and sugar refining waste filter mud provide good water retention, ensuring that the solidified soil is not easy to dry and has strong water resistance.

[0032] (2) The early-strength curing agent based on all-source solid and liquid waste provided by the present invention is not easily affected by the environment during the curing process. Since the waste alkaline liquid provides a strong alkaline environment, it ensures the normal progress of hydration reaction and volcanic ash reaction, making the curing agent less susceptible to changes in environmental acidity, alkalinity and temperature.

[0033] (3) The early-strength curing agent based on all-source solid and liquid waste provided by the present invention has the characteristics of being green and environmentally friendly. The raw materials of the curing agent are all derived from solid and liquid waste, realizing the resource utilization of industrial solid waste and developing low-carbon cementitious materials. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the preparation process of an early-strength curing agent based on all-source solid and liquid waste.

[0035] Figure 2 These are intensity comparison diagrams of Embodiments 1 and 2 and Comparative Examples 1, 2, and 3 of the present invention;

[0036] Figure 3 This is a comparison diagram of the number of cracks in Embodiment 1 and Comparative Examples 4 and 5 of the present invention;

[0037] Figure 4 These are intensity comparison diagrams of Embodiment 1 and Comparative Examples 3, 6, and 7 of the present invention;

[0038] Figure 5 The above are intensity comparison diagrams of Embodiment 1 and Comparative Examples 3, 8, and 9 of the present invention. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto. It should be noted that any processes or parameters not specifically described in detail below are those that can be understood or implemented by those skilled in the art with reference to the prior art.

[0040] The weight (mass) parts used in the following examples and comparative examples are for illustrative purposes only. The weight unit can be grams, kilograms, or any other amount commonly used in the art.

[0041] The early-strength curing agent based on all-source solid and liquid waste provided in this embodiment of the invention includes solid waste component A and liquid waste component B. By mass parts, solid waste component A includes 5.0-8.0 parts of asbestos waste, 4.5-5.5 parts of sugar refining waste filter mud, 75-80 parts of granulated blast furnace slag, 4.0-5.0 parts of desulfurized gypsum, and 5.5-7.5 parts of lithium extraction waste from salt lakes; liquid waste component B includes 20-30 parts of waste alkali solution and 70-80 parts of water.

[0042] The method for preparing an early-strength curing agent based on all-source solid and liquid waste provided in this invention embodiment (refer to...) Figure 1 As shown), the specific steps include the following:

[0043] (1) Prepare solid waste component A, including 5.0 to 8.0 parts of asbestos waste, 4.5 to 5.5 parts of sugar refining waste filter mud, 75 to 80 parts of granulated blast furnace slag, 4.0 to 5.0 parts of desulfurized gypsum, and 5.5 to 7.5 parts of lithium extraction waste from salt lake;

[0044] (2) Prepare liquid waste component B, including 20-30 parts of waste alkali solution and 70-80 parts of water;

[0045] (3) Premix and thoroughly mix the substances in solid waste component A;

[0046] (4) Add 20-30 parts of solid waste component A to waste alkali solution, stir evenly, and let stand;

[0047] (5) Add 70-80 parts of water, stir evenly, and prepare a solidifying agent slurry based on all-source solid and liquid waste.

[0048] To more clearly illustrate the technical solution and advantages of the present invention, the present invention will be further explained below in conjunction with specific embodiments and comparative examples.

[0049] The asbestos waste used in the following examples is asbestos dust and waste asbestos generated during the production of asbestos products; the components of the asbestos waste include silicon dioxide, magnesium oxide and water of crystallization; the mass ratio of silicon dioxide to magnesium oxide is 1:1, and the mass of silicon dioxide and magnesium oxide accounts for more than 80% of the mass of the asbestos waste.

[0050] Sugar refining waste filter mud is a solid waste obtained by harmlessly treating sugar refining waste using the carbonation method; the components of the sugar refining waste filter mud include calcium carbonate, magnesium carbonate, silicon dioxide and aluminum oxide; the mass percentage of calcium carbonate is 85%, the mass percentage of magnesium carbonate is 5%, the mass percentage of silicon dioxide is 6%, and the mass percentage of aluminum oxide is 4%.

[0051] Granulated blast furnace slag is the waste residue generated during the blast furnace smelting of pig iron in an ironmaking plant; the components of the granulated blast furnace slag include calcium oxide, silicon dioxide, aluminum oxide and magnesium oxide; the mass percentage of calcium oxide is 45%, the mass percentage of silicon dioxide is 25%, the mass percentage of aluminum oxide is 20%, and the mass percentage of magnesium oxide is 10%.

[0052] The desulfurization gypsum is a solid waste generated in coal-fired power plants using the limestone-lime wet flue gas desulfurization process; the component of the desulfurization gypsum is calcium sulfate dihydrate.

[0053] The lithium extraction waste residue from the salt lake is an insoluble solid waste precipitated during the evaporation and concentration process of salt lake brine; the components of the lithium extraction waste residue from the salt lake include lithium carbonate and calcium sulfate; the mass ratio of lithium carbonate to calcium sulfate is 20:30.

[0054] The waste alkali solution is a liquid waste generated during the cooking process of alkaline pulp manufacturing; the components of the waste alkali solution include lignin, sodium hydroxide and water; in the waste alkali solution, the mass percentage concentration of lignin is 10% and the mass percentage concentration of sodium hydroxide is 5%.

[0055] Example 1

[0056] An early-strength curing agent based on all-source solid and liquid waste is prepared, consisting of solid waste component A (total 10 kg) composed of 0.7 kg of asbestos waste, 0.55 kg of sugar refining waste filter mud, 7.5 kg of granulated blast furnace slag, 0.5 kg of desulfurized gypsum, and 0.75 kg of lithium extraction waste from salt lake; 2 kg of waste alkali solution and 8 kg of water are also prepared.

[0057] A method for preparing an early-strength curing agent based on all-source solid and liquid waste includes the following steps:

[0058] (1) Premix 10 kg of solid waste component A evenly;

[0059] (2) Add solid waste component A to 2 kg of waste alkali solution, stir evenly, and let stand for 6 hours;

[0060] (3) Add 8 kg of water and stir evenly to prepare a curing agent slurry based on all-source solid and liquid waste (early-strength curing agent based on all-source solid and liquid waste).

[0061] The early-strength curing agent based on all-source solid and liquid waste prepared in this embodiment was poured into 100 kg of silty clay (particle size of 2 mm). The mass of the early-strength curing agent based on all-source solid and liquid waste was 12% of the mass of the silty clay. The mixture was stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 1 day, 2 days and 7 days for unconfined compressive strength testing. The compressive strength was measured to be 0.60 MPa after 1 day, 2.36 MPa after 2 days and 2.80 MPa after 7 days.

[0062] Example 2

[0063] An early-strength curing agent based on all-source solid and liquid waste is prepared, consisting of solid waste component A (total 10 kg) composed of 0.5 kg of asbestos waste, 0.5 kg of sugar refining waste filter mud, 8.0 kg of granulated blast furnace slag, 0.5 kg of desulfurized gypsum, and 0.5 kg of lithium extraction waste from salt lake; 2 kg of waste alkali solution and 8 kg of water are also prepared.

[0064] A method for preparing an early-strength curing agent based on all-source solid and liquid waste includes the following steps:

[0065] (1) Premix 10 kg of solid waste component A evenly;

[0066] (2) Add solid waste component A to 2 kg of waste alkali solution, stir evenly, and let stand for 6 hours;

[0067] (3) Add 8 kg of water and stir evenly to prepare a curing agent slurry based on all-source solid and liquid waste (early-strength curing agent based on all-source solid and liquid waste).

[0068] The curing agent slurry prepared in this embodiment was poured into 100 kg of silty clay (particle size of 2 mm). The mass of the early-strength curing agent based on the whole-source solid and liquid waste was 12% of the mass of the silty clay. The mixture was stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 1 day, 2 days and 7 days for compressive strength testing. The compressive strength was measured to be 0.62 MPa after 1 day, 2.40 MPa after 2 days and 2.85 MPa after 7 days.

[0069] Comparative Example 1

[0070] Prepare 10 kg of PO42.5R cement and 10 kg of water, mix them thoroughly to obtain cement slurry. The manufacturer of PO42.5R cement is Guangzhou Xingli Building Materials Co., Ltd.

[0071] The cement slurry prepared in the comparative example was poured into 100 kg of silty clay (particle size of 2 mm) and stirred evenly to obtain soil after adding cement slurry. Core samples were taken after 1 day, 2 days and 7 days for unconfined compressive strength testing. The compressive strength was measured to be 0.13 MPa after 1 day, 0.81 MPa after 2 days and 1.22 MPa after 7 days.

[0072] Comparative Example 2

[0073] Comparative Example 2 was basically the same as Example 1, except that the curing agent used in Comparative Example 2 did not contain lithium extraction waste residue from salt lakes. The curing agent slurry prepared in Comparative Example 2 was poured into 100 kg of silty clay (particle size of 2 mm) and stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 1 day, 2 days and 7 days for unconfined compressive strength testing. The compressive strength was measured to be 0.33 MPa after 1 day, 0.89 MPa after 2 days and 1.52 MPa after 7 days.

[0074] Comparative Example 3

[0075] Comparative Example 3 was basically the same as Example 1, except that 1 kg of waste alkali solution and 9 kg of water were used in Comparative Example 3. The curing agent slurry prepared in this example was poured into 100 kg of silty clay (particle size of 2 mm) and stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 1 day, 2 days and 7 days for unconfined compressive strength testing. The compressive strength was measured to be 0.23 MPa after 1 day, 1.55 MPa after 2 days and 2.18 MPa after 7 days.

[0076] Comparative Example 4

[0077] Comparative Example 4 was essentially the same as Example 1, except that the curing agent used in Comparative Example 4 did not contain asbestos waste. The curing agent slurry prepared in Comparative Example 4 was completely poured into 100 kg of silty clay (particle size 2 mm) and stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 2 and 7 days and subjected to 5 wet-dry cycle tests along with the core samples from Example 1 to measure the number of surface cracks. Data showed that the core samples from Example 1 had 0 and 1 surface cracks at 2 and 7 days, respectively, while the core samples from Comparative Example 4 had 3 and 7 surface cracks, respectively.

[0078] Comparative Example 5

[0079] Comparative Example 5 was essentially the same as Example 1, except that the curing agent used in Comparative Example 5 did not contain sugar refining waste filter mud. The curing agent slurry prepared in this comparative example was completely poured into 100 kg of silty clay (particle size 2 mm) and stirred evenly to obtain soil after adding the curing agent. Core samples were taken after 2 and 7 days and subjected to 5 wet-dry cycle tests along with the core samples from Example 1 to measure the number of surface cracks. Data showed that the core samples from Example 1 had 0 and 1 surface cracks at 2 and 7 days, respectively, while the core samples from Comparative Example 5 had 5 and 11 surface cracks, respectively.

[0080] Comparative Example 6

[0081] Comparative Example 6 was essentially the same as Example 1, except that acetic acid was added to the soil after the solidifier was added in Comparative Example 6, making its pH value 0.5 lower than that of the slag soil in Example 1. Core samples were taken after 1 day, 2 days, and 7 days for unconfined compressive strength testing. The measured compressive strength was 0.51 MPa after 1 day, 2.16 MPa after 2 days, and 2.58 MPa after 7 days.

[0082] Comparative Example 7

[0083] Comparative Example 7 was basically the same as Comparative Example 3, except that acetic acid was added to the soil after the solidifier was added in Comparative Example 7, making the pH value 0.5 lower than that of the slag soil in Comparative Example 3. Core samples were taken after 1 day, 2 days and 7 days for unconfined compressive strength testing. The compressive strength was measured to be 0.08 MPa after 1 day, 0.75 MPa after 2 days and 1.08 MPa after 7 days.

[0084] Comparative Example 8

[0085] Comparative Example 8 was essentially the same as Example 1, except that the soil in Comparative Example 8 was frozen after the addition of the curing agent, resulting in a soil temperature 10°C lower than that in Example 1. Core samples were taken after 1, 2, and 7 days for unconfined compressive strength testing. The measured compressive strength was 0.59 MPa at 1 day, 2.25 MPa at 2 days, and 2.70 MPa at 7 days.

[0086] Comparative Example 9

[0087] Comparative Example 9 was essentially the same as Comparative Example 3, except that the soil in Comparative Example 9 was frozen after the addition of the solidifying agent, resulting in a soil temperature 10°C lower than that in Comparative Example 3. Core samples were taken after 1, 2, and 7 days for unconfined compressive strength testing. The measured compressive strength was 0.06 MPa at 1 day, 0.55 MPa at 2 days, and 1.11 MPa at 7 days.

[0088] The unconfined compressive strength tests of the core samples in the above embodiments and comparative examples were conducted using the methods in the "Specifications for Testing Geotechnical Engineering for Highways" (JTG 3430-2020).

[0089] The strength comparison diagram of the core samples prepared in the embodiments and comparative examples of the present invention is shown in the figure below. Figure 2 As shown.

[0090] A comparison of the compressive strength of Example 1 and Comparative Example 1 shows that the 1-day strength of the curing agent of the present invention is close to the 2-day strength of PO42.5R cement, and the 2-day strength of the curing agent exceeds the 7-day strength of PO42.5R cement. Therefore, the curing agent of the present invention exhibits significant early strength characteristics, and its performance far surpasses that of PO42.5R cement.

[0091] A comparison of the compressive strength of Example 1 and Comparative Example 2 shows that the strength is significantly reduced when the curing agent does not contain lithium extraction waste from salt lakes. However, in the curing agent of this invention, the lithium extraction waste from salt lakes acts as a catalyst, synergistically stimulating the early reaction between granulated blast furnace slag and desulfurized gypsum in an alkaline environment, promoting the generation of more hydration products. These hydration products intertwine to form a tight network structure, significantly improving early strength.

[0092] The comparison of compressive strength between Example 1 and Comparative Example 3 shows that the strength is significantly reduced when the amount of waste alkali solution is reduced. This is because the waste alkali solution provides a strong alkaline environment, which ensures the normal progress of the hydration reaction and the pozzolanic reaction. Reducing the amount of alkali solution will seriously affect the effect of the curing agent.

[0093] Figure 3 This is a comparison chart of the number of cracks in Embodiment 1 and Comparative Examples 4 and 5 of the present invention; from Figure 3 As can be seen from the comparison of the number of surface cracks of the samples in Example 1 and Comparative Examples 4 and 5, the magnesium-containing compounds in the asbestos waste and sugar refining waste filter mud provide good water retention, ensuring that the solidified soil is not prone to drying shrinkage and has strong water resistance.

[0094] Figure 4 These are intensity comparison diagrams of Embodiment 1 and Comparative Examples 3, 6, and 7 of the present invention; from Figure 4 As can be seen from the comparison of compressive strength between Example 1 and Comparative Examples 3, 6 and 7, the waste alkaline solution provides a strong alkaline environment, ensuring the normal progress of the hydration reaction and the volcanic ash reaction, making the curing agent less susceptible to the influence of environmental acidity and alkalinity.

[0095] Figure 5 These are intensity comparison diagrams of Embodiment 1 and Comparative Examples 3, 8, and 9 of the present invention; from Figure 5 As can be seen from the comparison of compressive strength between Example 1 and Comparative Examples 3, 8, and 9, the waste alkaline solution provides a strong alkaline environment, ensuring the normal progress of the hydration reaction and the volcanic ash reaction, making the curing agent less susceptible to the influence of ambient temperature.

[0096] The above embodiments are merely preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any changes, substitutions, modifications, etc., made by those skilled in the art without departing from the spirit and essence of the present invention should be within the protection scope of the present invention.

Claims

1. An early-strength curing agent based on all-source solid and liquid waste, characterized in that, Based on parts by mass, it includes the following components:

2. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The asbestos waste refers to asbestos dust and waste asbestos generated during the production of asbestos products; the components of the asbestos waste include silicon dioxide, magnesium oxide and water of crystallization; the mass ratio of silicon dioxide to magnesium oxide is 1:1, and the mass of silicon dioxide and magnesium oxide accounts for more than 80% of the mass of the asbestos waste.

3. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The sugar refining waste filter mud is a solid waste obtained by harmlessly treating sugar refining waste using the carbonation method; the components of the sugar refining waste filter mud include calcium carbonate, magnesium carbonate, silicon dioxide and aluminum oxide; the mass percentage of calcium carbonate is 70% to 90%, the mass percentage of magnesium carbonate is 1% to 10%, the mass percentage of silicon dioxide is 2% to 6%, and the mass percentage of aluminum oxide is 1% to 4%.

4. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The granulated blast furnace slag is the waste slag generated during the blast furnace smelting of pig iron in an ironmaking plant; the components of the granulated blast furnace slag include calcium oxide, silicon dioxide, aluminum oxide and magnesium oxide; the mass percentage of calcium oxide is 45% to 50%, the mass percentage of silicon dioxide is 25% to 30%, the mass percentage of aluminum oxide is 15% to 20%, and the mass percentage of magnesium oxide is 8% to 12%.

5. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The desulfurization gypsum is a solid waste generated in coal-fired power plants using the limestone-lime wet flue gas desulfurization process; the component of the desulfurization gypsum is calcium sulfate dihydrate.

6. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The lithium extraction waste residue from the salt lake is an insoluble solid waste precipitated during the evaporation and concentration process of salt lake brine; the components of the lithium extraction waste residue from the salt lake include lithium carbonate and calcium sulfate; the mass ratio of lithium carbonate to calcium sulfate is 5-20:5-30.

7. The early-strength curing agent based on all-source solid and liquid waste according to claim 1, characterized in that, The waste alkali solution is a liquid waste generated during the cooking process in the alkaline pulp manufacturing process; the components of the waste alkali solution include lignin, sodium hydroxide and water; in the waste alkali solution, the mass percentage concentration of lignin is 3% to 12% and the mass percentage concentration of sodium hydroxide is 2% to 8%.

8. The method for preparing the early-strength curing agent based on all-source solid and liquid waste as described in any one of claims 1-7, characterized in that, Includes the following steps: Asbestos waste, sugar refining waste filter mud, granulated blast furnace slag, desulfurized gypsum, and lithium extraction waste from salt lake are mixed evenly, then waste alkali solution is added, mixed evenly, left to stand, and then water is added and mixed evenly to obtain the early-strength curing agent based on all-source solid and liquid waste.

9. The preparation method according to claim 8, characterized in that, The settling time is 6-12 hours.

10. The application of the early-strength solidifying agent based on all-source solid and liquid waste as described in any one of claims 1-7 in soil solidification, characterized in that, The mass of the early-strength solidifying agent based on all-source solid and liquid waste is 5%-20% of the soil mass.

Images