A full-solid waste fluidized solidification filler and a preparation method thereof

Abstract

The application belongs to the technical field of solid waste recycling, and particularly relates to a full-solid-waste flow-state solidification filler and a preparation method thereof. The full-solid-waste flow-state solidification filler is composed of the following components in parts by mass: 800-950 parts of fine-particle industrial solid waste, 50-200 parts of a composite solidification agent, 50-200 parts of an extension degree regulating component, 5-50 parts of an anti-shrinkage component, 2-10 parts of a water-saturated component, and 250-450 parts of water. The fine-particle industrial solid waste is at least one of gold tailings, industrial by-product gypsum, ultra-fine iron tailings, graphite tailings, river-lake facies silt, recycled powder, fine-particle steel slag powder, red mud and slag soil; and the fine-particle industrial solid waste has a particle size of less than 5 mm. The application realizes high-mixing of fine-particle industrial solid waste and full-solid-waste flow-state utilization, effectively solves the technical problems of low comprehensive utilization rate, large performance fluctuation and difficulty in high-water-content treatment, and has significant economic and social benefits.

Description

Technical Field

[0001] This invention relates to the field of solid waste recycling technology, and particularly to a fluidized solidified packing material for all solid waste and its preparation method. Background Technology

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

[0003] Industrial solid waste is mainly divided into coarse-grained solid waste and fine-grained solid waste. Currently, some progress has been made in the comprehensive utilization of coarse-grained solid waste, primarily focusing on simply replacing natural sand and gravel aggregates with it. In contrast, fine-grained solid waste, such as gold tailings, industrial by-product gypsum, ultrafine iron tailings, graphite tailings, river and lake silt, recycled powder, fine steel slag powder, red mud, and slag, still lacks large-scale, high-value-added utilization pathways. The resource utilization of fine-grained industrial solid waste faces the following technical challenges:

[0004] 1. The inherent performance limitations of fine-grained industrial solid waste restrict its dosage and performance during use. Fine-grained solid waste particles have small diameters and large specific surface areas, and currently it is mainly used as a partial substitute for fine aggregates. Excessive dosage will disrupt the particle size distribution framework, leading to decreased workability of freshly mixed materials, increased shrinkage of hardened bodies, and susceptibility to cracking. Existing technologies typically only allow for a low substitution rate of no more than 50%, making large-scale disposal difficult.

[0005] 2. The comprehensive utilization cost of fine-grained industrial solid waste materials is high. Most fine-grained solid wastes are chemically stable, with weak intrinsic activity and low strength, requiring external cementitious materials such as cement to achieve strength. However, solid wastes from different sources and even different batches exhibit significant fluctuations in their physical properties (such as particle morphology and size distribution) and chemical properties (such as main components and mineral composition), making it difficult to adapt traditional cement-based cementitious materials. To meet engineering strength requirements, it is often necessary to develop specialized cementitious materials for specific solid wastes, which involves high technical barriers and significantly increases research and development and material costs.

[0006] 3. High moisture content and agglomeration characteristics of fine-grained industrial solid waste lead to high pretreatment costs. Fine-grained industrial solid waste often exhibits high moisture content and is prone to agglomeration, requiring pretreatment. Currently, pretreatment mainly employs a combination of natural drying and mechanical crushing / deagglomeration processes, which are time-consuming and require space and equipment, increasing both the time and cost of comprehensive utilization of fine-grained industrial solid waste. Summary of the Invention

[0007] In view of this, the present invention provides a fluidized solidified packing material for all solid waste and its preparation method. The fluidized solidified packing material for all solid waste proposed in this invention overcomes the technical problems of low comprehensive utilization rate, large fluctuation of material properties, and difficulty in comprehensive utilization of high moisture content solid waste in the process of comprehensive utilization of fine-grained industrial solid waste. The fluidized solidified packing material for all solid waste can be used in roadbed engineering, foundation pit engineering, mining engineering, and municipal engineering, etc., reducing comprehensive utilization costs and achieving significant economic and social benefits.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0009] In a first aspect, the present invention provides a fluidized solidification packing material for all solid waste, which, by mass parts, comprises the following components:

[0010] 800-950 parts of fine-grained industrial solid waste, 50-200 parts of composite curing agent, 50-200 parts of expansion control component, 5-50 parts of anti-shrinkage component, 2-10 parts of water-saturated component, and 250-450 parts of water.

[0011] The fine-grained industrial solid waste is at least one of the following: gold tailings, industrial by-product gypsum, ultrafine iron tailings, graphite tailings, lacustrine silt, recycled powder, fine-grained steel slag powder, red mud, and slag soil; the particle size of the fine-grained industrial solid waste is less than 5 mm (excluding agglomerates and clusters).

[0012] The composite curing agent comprises industrial solid waste and alkaline solid waste rich in active silica-alumina materials;

[0013] The expansion control component is selected from at least one of fly ash microspheres, ultrafine fly ash, or spherical silica.

[0014] The anti-shrinkage component is selected from at least one of decommissioned wind turbine blade fibers, waste tire cord, and straw fibers;

[0015] The saturated component is selected from at least one of ball-milled coal slag, diatomaceous earth, recycled construction waste powder, and waste clay ceramsite.

[0016] Furthermore, in the fine-grained industrial solid waste, the mass percentage of particles with a diameter of 2-5 mm is no more than 25%, the mass percentage of particles with a diameter of 0-0.075 mm is no more than 30%, and the moisture content is no more than 60%. In the all-solid waste fluidized bed solidification filler, the fine-grained industrial solid waste mainly serves as a filler and reaction matrix, or provides a certain activating effect (such as industrial by-product gypsum and red mud) to activate the composite solidifying agent.

[0017] Furthermore, the mass ratio of the industrial solid waste rich in active silicon-aluminum materials to the alkaline solid waste is 0.8~0.9:0.1~0.2.

[0018] Furthermore, the industrial solid waste rich in active silicon-aluminum materials has a moisture content of no more than 1%, and is a mixture of two or more of ultrafine slag powder, ball-milled smelting slag powder, decarburized coal gangue powder, and steel slag micro powder; preferably, when using a mixture, the mass ratio of the four is 0.6~1:0.2~0.6:0.2~0.4:0~1.

[0019] Furthermore, the specific surface area of ​​the ultrafine slag powder is not less than 600 m². 2 / kg, grade not lower than S115, specific surface area of ​​ball-milled smelting slag powder, decarburized coal gangue powder, and steel slag powder not less than 400 m² 2 / kg.

[0020] Furthermore, the smelting slag powder is at least one of copper smelting slag or nickel smelting slag, and when a mixture is used, the mass ratio of the two is 0.2~0.4:0.6~0.8.

[0021] Furthermore, the industrial solid waste rich in active silicon-aluminum materials has a silicon-to-aluminum ratio (Si / Al) ranging from 1.7 to 2.2, a calcium-to-silicon ratio (Ca / Si) ranging from 0.5 to 1.0, and a sodium-to-aluminum ratio (Na / Al) ranging from 0.6 to 1.0.

[0022] Furthermore, the alkaline solid waste includes one or a mixture of several of the following: distillation residue from soda ash production, alkali washing sludge, and white / green mud from alkali pulping. Preferably, when a mixture is used, the mass ratio of the three is 0.4~0.7:0.2~0.4:0.1~1. The moisture content of the alkaline solid waste is not greater than 1%, and the particle size is not greater than 0.075 mm.

[0023] Furthermore, the pH value of the leaching solution of the alkaline solid waste is not less than 10.5.

[0024] Industrial solid waste rich in active silica-alumina materials mainly provides amorphous active components such as calcium-magnesium-aluminum-silicate glass. In alkaline solid waste, these components are activated under alkaline conditions to form CASH (calcium-silicon-aluminum-hydrate) gel and / or NASH (sodium-silicon-aluminum-hydrate) gel, thus contributing to strength. By controlling the ratio of elements such as Si / Al and Ca / Si in the active silica-alumina materials, the formation of NASH gel and CASH gel can be promoted within the system. The two are intertwined and symbiotic, forming a more stable tetrahedral structure during hydration. CASH gel provides early strength to the system, while NASH gel contributes to later strength development, volume stability, and durability. By controlling the Na / Al ratio, the pH value of the reaction environment can be ensured to be high enough to continuously dissolve the silicon and aluminum components in the precursor, promoting the formation of CASH (calcium-silicon-aluminum-hydrate) gel and NASH (sodium-silicon-aluminum-hydrate).

[0025] Furthermore, when the expansion control component is a mixture of fly ash microspheres, ultrafine fly ash, and spherical silica, the mass ratio of the three is 0.6~0.8:0.1~0.2:0.1~1; the specific surface area of ​​the expansion control component is not less than 400 m². 2 / kg, with a moisture content of no more than 2%. The expansion control component is mainly composed of spherical microparticles. It can utilize the morphological effect of spherical solid waste to reduce the frictional resistance in the all-solid waste fluidized solidification packing, offset or mitigate the flowability deterioration caused by the use of other irregularly shaped fine-grained solid wastes (such as tailings, sludge, etc.), reduce the amount of mixing water, and improve the expansion. At the same time, it can fill the gaps between larger particles, making the packing structure more compact and improving the strength and durability of the all-solid waste fluidized solidification packing.

[0026] Furthermore, when the anti-shrinkage component is a mixture of decommissioned wind turbine blade fiber, waste tire cord and straw fiber, the moisture content is not greater than 5%, and the volume ratio of the three is 0.4~0.7:0.2~0.8:0.1~0.3.

[0027] Furthermore, the length of the anti-shrinkage component is no greater than 2 cm.

[0028] The anti-shrinkage component forms a three-dimensional random network skeleton in the solid waste fluidized solidification filler matrix, blocking the rapid and continuous migration channels of moisture and reducing plastic shrinkage cracks. Simultaneously, when shrinkage stress begins to form in the matrix, the anti-shrinkage component exhibits significant surface adhesion to the slurry, effectively transferring stress to the anti-shrinkage component. The anti-shrinkage component then shares and offsets this tensile stress through its own tensile strength, thereby preventing the initiation and propagation of cracks.

[0029] Furthermore, when the saturated component is a mixture of ball-milled coal slag, diatomaceous earth, recycled construction waste powder, and waste clay ceramsite, the mass ratio of the four components is 0.1~0.5:0.1~1:0.2~1:0.2~1.

[0030] Furthermore, the saturated component has a water content of less than 1% and a particle size of less than 0.3 mm.

[0031] The saturated components can lock in the free water in the fluidized bed solidification packing material for solid waste, significantly reducing water separation and buoyancy. At the same time, it can flocculate fine particles into clusters, increasing settling resistance and keeping the entire system uniform and stable during settling or transportation, reducing the bleeding rate of the fluidized bed solidification packing material for solid waste and preventing segregation.

[0032] Furthermore, the water is mixing water, which should meet the requirements of the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T233-2011. The mixing water can provide a liquid environment for the composite curing agent, promote the hydration reaction, and adjust the expansion of the all-solid waste fluidized solidification filler to ensure pumping performance during construction.

[0033] In a second aspect, the present invention provides a method for preparing the all-solid waste fluidized solidified packing described in the first aspect, comprising the following steps:

[0034] (1) Weigh out the specified mass of fine-grained industrial solid waste, composite curing agent, expansion control component, anti-shrinkage component, saturated component and water;

[0035] (2) Add fine-grained industrial solid waste, composite solidifying agent, and expansion control component to water in sequence, stir, and obtain a mixed system;

[0036] (3) Add the anti-shrinkage component and the water-saturated component to the mixture in step (2) in sequence, stir, and cast into shape to obtain the final product.

[0037] Furthermore, in step (2), stir for 3~5 min; stir speed 200~400 rpm.

[0038] Furthermore, in step (3), the stirring is performed for 2 to 4 minutes and the stirring speed is 200 to 400 rpm.

[0039] Thirdly, the present invention provides the application of the all-solid waste fluidized solidified filler described in the first aspect in roadbed engineering, foundation pit engineering, mining engineering or municipal engineering.

[0040] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0041] (1) This invention realizes the complete replacement of natural fillers with fine-grained industrial solid waste. The total amount of solid waste can reach 100%. Except for the anti-shrinkage component, all of them are fine-grained industrial solid waste. Therefore, this invention provides a revolutionary technical path for the large-scale disposal of fine-grained solid waste.

[0042] (2) Based on the “multi-source solid waste multi-polymerization degree material matching design” and the “silicon-aluminum coordination isomorphism effect”, a stable geopolymer network structure was constructed through the complementary and synergistic stimulation of different solid waste components. This system has broad inclusiveness and adaptability to solid wastes of different sources and different physicochemical properties, and effectively solves the problem of poor compatibility of cementitious materials caused by the fluctuation of solid waste performance.

[0043] (3) The present invention allows the direct use of raw solid waste with high water content and agglomeration by means of an optimized fluidized bed preparation method, and completes the "deagglomeration" and "mixing", completely eliminating the high-cost and long-cycle "natural drying" and "mechanical crushing" pretreatment links, and greatly reducing energy consumption and cost.

[0044] (4) The final product of this invention has good fluidity and self-leveling properties, and no vibration is required during construction, resulting in high work efficiency. The entire system has low raw material costs, a simple process flow, and extremely significant comprehensive economic and social environmental benefits. Detailed Implementation

[0045] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0046] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0047] Example 1

[0048] A gold tailings-based fluidized solidified filler comprises, by weight, 900 parts gold tailings, 100 parts composite curing agent, 50 parts expansion control component, 20 parts anti-shrinkage component, 5 parts water-saturated component, and 300 parts mixing water.

[0049] The gold tailings have a particle size range of 0-0.5 mm and a moisture content of 27%. The composite curing agent contains industrial solid waste rich in active silica-alumina materials and alkaline solid waste in a mass ratio of 0.8:0.2. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder and decarbonized coal gangue powder in a mass ratio of 0.9:0.1, with moisture contents of 0.5% and 0.6%, respectively. The alkaline solid waste is white mud from alkaline pulping with a moisture content of 0.5%. The expansion control component is a mixture of fly ash microspheres and spherical silica in a mass ratio of 0.8:0.2, with moisture contents of 0.8% and 1.2%, respectively. The anti-shrinkage component is decommissioned wind turbine blade fiber with a length of 1.5 cm and a moisture content of 2.6%. The saturated component is diatomaceous earth with a moisture content of 0.6%.

[0050] The preparation method of the gold tailings-based fluidized solidified filler in this embodiment includes the following steps:

[0051] (1) Weigh out the specified mass of gold tailings, composite solidifying agent, expansion control component, anti-shrinkage component, saturated component and mixing water;

[0052] (2) Add gold tailings, composite solidifying agent and expansion control component to the mixing water in sequence, stir for 4 min at a stirring speed of 300 rpm to obtain a mixed system;

[0053] (3) Add the anti-shrinkage component and the water-saturated component to the mixture in step (2) in sequence, stir for 4 min at a stirring speed of 300 rpm, and then cast into shape to obtain the final product.

[0054] The gold tailings-based fluidized solidified filler from this embodiment was placed in a truncated conical mold for a strip table spread test to measure its spread. Eighteen cubic specimens of 100 mm × 100 mm × 100 mm were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Cement-Soil Mix Design" JGJ / T 233-2011.

[0055] Example 2

[0056] An industrial by-product gypsum-based fluidized solidification filler comprises, by weight, 850 parts industrial by-product gypsum, 150 parts composite curing agent, 200 parts expansion control component, 10 parts anti-shrinkage component, 5 parts water-saturated component, and 380 parts mixing water.

[0057] The industrial by-product gypsum has a particle size range of 0-0.3 mm and a moisture content of 36%. The composite curing agent contains an industrial solid waste rich in active silica-alumina materials and alkaline solid waste in a mass ratio of 0.9:0.1. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder, ball-milled smelting slag powder, and steel slag powder, with a mass ratio of 0.8:0.1:0.1 and moisture contents of 0.4%, 0.8%, and 0.5%, respectively. The alkaline solid waste is a mixture of soda ash production distillation waste residue and alkaline washing sludge, with a mass ratio of 0.6:0.4 and moisture contents of 0.7% and 0.8%, respectively. The expansion control component is ultrafine fly ash with a moisture content of 0.6%. The anti-shrinkage component is waste tire cord with a length of 1... cm, with a moisture content of 3.1%; the saturated component is a mixture of ball-milled coal slag and recycled construction waste powder, with a mass ratio of 0.5:0.5 and moisture contents of 0.6% and 0.8%, respectively.

[0058] The preparation method of the industrial by-product gypsum-based fluidized solidification filler in this embodiment includes the following steps:

[0059] (1) Weigh out the industrial by-product gypsum, composite curing agent, expansion control component, anti-shrinkage component, saturated component and mixing water according to the specified mass;

[0060] (2) Add industrial by-product gypsum, composite curing agent and expansion control component to the mixing water in sequence, stir for 5 min at a stirring speed of 400 rpm to obtain a mixed system;

[0061] (3) Add the anti-shrinkage component and the water-saturated component to the mixture in step (2) in sequence, stir for 4 min at a stirring speed of 400 rpm, and then cast into shape to obtain the final product.

[0062] The industrial by-product gypsum-based fluidized solidified filler used in this embodiment was placed in a truncated conical mold to conduct a strip table spread test to measure the spread. Eighteen cubic specimens of 100 mm × 100 mm × 100 mm were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Cement-Soil Mix Design" JGJ / T 233-2011.

[0063] Example 3

[0064] A fluidized solidified filler based on lacustrine silt, comprising, by weight, 900 parts lacustrine silt, 100 parts composite curing agent, 50 parts expansion control component, 30 parts anti-shrinkage component, 3 parts saturated water component, and 360 parts mixing water.

[0065] The composite curing agent contains lacustrine silt with a particle size range of 0-1 mm and a moisture content of 48%. The composite curing agent consists of industrial solid waste rich in active silica-alumina materials and alkaline solid waste in a mass ratio of 0.8:0.2. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder and steel slag powder in a mass ratio of 0.9:0.1, with moisture contents of 0.4% and 0.5%, respectively. The alkaline solid waste is green mud from alkaline pulping, with a moisture content of 0.9%. The expansion control component is a mixture of ultrafine fly ash and spherical silica in a mass ratio of 0.8:0.2, with moisture contents of 1.1% and 1.6%, respectively. The anti-shrinkage component consists of decommissioned wind turbine blade fiber and straw fiber, with a length of 1 cm and a moisture content of 1.9%. The saturated component is waste clay ceramsite with a moisture content of 0.8%.

[0066] The preparation method of the lacustrine silt-based fluidized solidified filler in this embodiment includes the following steps:

[0067] (1) Weigh out the set mass of lacustrine silt, composite solidifying agent, expansion control component, anti-shrinkage component, saturated component and mixing water;

[0068] (2) Add river and lake silt, composite solidifying agent and expansion control component to the mixing water in sequence, stir for 4 min at a stirring speed of 400 rpm to obtain a mixed system;

[0069] (3) Add the anti-shrinkage component and the water-saturated component to the mixture in step (2) in sequence, stir for 4 min at a stirring speed of 400 rpm, and then cast into shape to obtain the final product.

[0070] The lacustrine-cone silt-based fluidized solidified filler from this embodiment was placed in a truncated conical mold for strip table spread tests to measure its spread. Eighteen 100 mm × 100 mm × 100 mm cubic specimens were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Cement-Soil Mix Design" JGJ / T 233-2011.

[0071] Example 4

[0072] A recycled powder-based fluidized solidified filler comprises, by mass parts, 950 parts recycled powder, 50 parts composite curing agent, 200 parts expansion control component, 50 parts anti-shrinkage component, 10 parts water-saturated component, and 320 parts mixing water.

[0073] The recovered powder has a particle size range of 0-3 mm and a moisture content of 23%. The composite curing agent contains an industrial solid waste rich in active silica-alumina materials and an alkaline solid waste in a mass ratio of 0.85:0.15. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder and ball-milled smelting slag powder in a mass ratio of 0.8:0.2, with moisture contents of 0.4% and 0.8%, respectively. The ball-milled smelting slag powder is a mixture of smelting copper slag and smelting nickel slag in a mass ratio of 0.5:0.5. The alkaline solid waste is distillation waste residue from soda ash production, with a moisture content of 0.9%. The expansion control component is ultrafine fly ash with a moisture content of 0.6%. The anti-shrinkage component is waste tire cord with a length of 2 cm and a moisture content of 3.2%. The saturated component is a mixture of ball-milled coal slag and diatomaceous earth in a mass ratio of 0.3:0.7, with moisture contents of 0.4% and 0.6%, respectively.

[0074] The preparation method of the recycled powder-based fluidized solidified filler in this embodiment includes the following steps:

[0075] (1) Weigh out the specified mass of the recycled powder, composite curing agent, expansion control component, anti-shrinkage component, saturated component and mixing water;

[0076] (2) Add the recycled powder, composite curing agent and expansion control component to the mixing water in sequence, stir for 3 min at a stirring speed of 300 rpm to obtain the mixed system;

[0077] (3) Add the anti-shrinkage component and the saturated component to the mixture in step (2) in sequence, stir for 3 min at a stirring speed of 300 rpm, and then cast into shape to obtain the final product.

[0078] The recycled powder-based fluidized solidified filler from this embodiment was placed in a truncated conical mold to conduct a strip table spread test to measure the spread. Eighteen cubic specimens of 100 mm × 100 mm × 100 mm were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011.

[0079] Example 5

[0080] A slag-based fluidized solidified filler, by mass parts, comprises 900 parts slag, 100 parts composite solidifying agent, 100 parts expansion control component, 5 parts anti-shrinkage component, 10 parts water-saturated component, and 300 parts mixing water.

[0081] The slag particles range from 0 to 5 mm in size and have a moisture content of 12%. The composite curing agent contains industrial solid waste rich in active silica-alumina materials and alkaline solid waste in a mass ratio of 0.9:0.1, with moisture contents of 0.7% and 0.8%, respectively. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder and steel slag powder in a mass ratio of 0.9:0.1. The alkaline solid waste is alkali washing sludge with a moisture content of 0.8%. The expansion control component is fly ash microspheres with a moisture content of 1.6%. The anti-shrinkage component is decommissioned wind turbine blade fiber with a length of 2 cm and a moisture content of 0.8%. The saturated component is ball-milled coal slag with a moisture content of 0.6%.

[0082] The preparation method of the slag-based fluidized solidified filler in this embodiment includes the following steps:

[0083] (1) Weigh out the specified mass of slag, composite solidifying agent, expansion control component, anti-shrinkage component, saturated component and mixing water;

[0084] (2) Add the slag, composite solidifying agent and expansion control component to the mixing water in sequence, stir for 3 min at a stirring speed of 300 rpm to obtain the mixed system;

[0085] (3) Add the anti-shrinkage component and the saturated component to the mixture in step (2) in sequence, stir for 3 min at a stirring speed of 300 rpm, and then cast into shape to obtain the final product.

[0086] The slag-based fluidized solidified filler in this embodiment was placed in a truncated conical mold to conduct a strip table spread test to measure the spread. Eighteen cubic specimens of 100 mm × 100 mm × 100 mm were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Cement-Soil Mix Design" JGJ / T 233-2011.

[0087] Example 6

[0088] A red mud-based fluidized solidified filler, by mass parts, comprises 850 parts red mud, 150 parts composite curing agent, 150 parts expansion control component, 50 parts anti-shrinkage component, 3 parts water-saturated component, and 390 parts mixing water.

[0089] The red mud has a particle size range of 0-1 mm and a moisture content of 27%. The composite curing agent contains industrial solid waste rich in active silica-alumina materials and alkaline solid waste in a mass ratio of 0.9:0.1, with moisture contents of 0.6% and 0.8%, respectively. The industrial solid waste rich in active silica-alumina materials is a mixture of S115 grade ultrafine slag powder and ball-milled smelting slag powder, with a mass ratio of 0.8:0.2. The alkaline solid waste is white mud from alkaline pulping, with a moisture content of 0.6%. The expansion control component is ultrafine fly ash with a moisture content of 0.8%. The anti-shrinkage component is straw fiber with a length of 1 cm and a moisture content of 2.3%. The saturated component is diatomaceous earth with a moisture content of 0.8%.

[0090] The preparation method of the red mud-based fluidized solidified filler in this embodiment includes the following steps:

[0091] (1) Weigh out the specified mass of red mud, composite curing agent, expansion control component, anti-shrinkage component, saturated component and mixing water;

[0092] (2) Add red mud, composite curing agent and expansion control component to the mixing water in sequence, stir for 3 min at a stirring speed of 300 rpm to obtain a mixed system;

[0093] (3) Add the anti-shrinkage component and the saturated component to the mixture in step (2) in sequence, stir for 3 min at a stirring speed of 300 rpm, and then cast into shape to obtain the final product.

[0094] The red mud-based fluidized solidified filler in this embodiment was placed in a truncated conical mold to conduct a strip table spread test to measure the spread. Eighteen cubic specimens of 100 mm × 100 mm × 100 mm were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Cement-Soil Mix Design" JGJ / T 233-2011.

[0095] Comparative Example 1

[0096] This comparative example is a traditional fluidized solidified soil, whose mix proportions by mass include: 100 parts P·O425 cement, 900 parts dry silt, 3 parts cellulose ether, and 350 parts mixing water. The fluidized solidified soil was prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. A strip table spread test was conducted in a truncated cone mold to measure the spread. Eighteen 100 mm × 100 mm × 100 mm cubic specimens were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T233-2011.

[0097] Comparative Example 2

[0098] Compared to Example 1, this method lacks a spread control component. A fluidized solidified filler was prepared according to the method in JGJ / T 233-2011 of the "Specification for Cement-Soil Mix Design". This filler was then placed in a truncated cone mold for a strip-table spread test to measure the spread. Eighteen 100 mm × 100 mm × 100 mm cubic specimens were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the same method.

[0099] Comparative Example 3

[0100] Compared to Example 1, this method lacks the anti-shrinkage component. A fluidized solidified filler was prepared according to the method in JGJ / T 233-2011 of the "Specification for Cement-Soil Mix Design". The filler was placed in a truncated cone mold for a strip table spread test to measure the spread. Eighteen 100 mm × 100 mm × 100 mm cubic specimens were cast, and their 3-day, 7-day, and 28-day unconfined compressive strengths were tested according to the method in JGJ / T233-2011 of the "Specification for Cement-Soil Mix Design".

[0101] The results of strength and spread tests in the comparative examples and embodiments are summarized in Table 1; the results of shrinkage tests of the fluidized solidified filler are summarized in Table 2.

[0102] Table 1. Results of strength and scalability tests in Examples 1-6 and Comparative Examples 1-3

[0103]

[0104] As shown in Table 1, the unconfined compressive strength of the all-solid waste fluidized solidified filler proposed in this invention ranges from 1.93 to 2.56 MPa, which is higher than that of the traditional cement-based fluidized solidified soil in Comparative Example 1 (1.52 MPa). The expansion control component has a significant effect; in Comparative Example 2, which did not include this component, the measured expansion was smaller than that of other embodiments and comparative examples.

[0105] Table 2 Shrinkage rates of fluidized solidified fillers prepared in Examples 1-6 and Comparative Examples 1-3

[0106]

[0107] As shown in Table 2, the shrinkage rates of the all-solid waste fluidized bed fillers in Examples 1-6 of this invention are all superior to those of the traditional cement-based fluidized bed solidified soil in Comparative Example 1. Comparative Example 3, which did not contain any anti-shrinkage components, showed a higher measured shrinkage rate than both Examples 1 and Comparative Example 2. The addition of anti-shrinkage components effectively mitigates the shrinkage rate of the fluidized bed solidified filler.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fluidized solidification packing material for all solid waste, characterized in that, By mass fraction, the all-solid waste fluidized solidification filler is composed of the following components: 800-950 parts of fine-grained industrial solid waste, 50-200 parts of composite curing agent, 50-200 parts of expansion control component, 5-50 parts of anti-shrinkage component, 3-10 parts of water-saturated component, and 250-450 parts of water. The fine-grained industrial solid waste is at least one of gold tailings, industrial by-product gypsum, ultrafine iron tailings, graphite tailings, lacustrine silt, fine-grained steel slag powder, red mud, and slag soil; the particle size of the fine-grained industrial solid waste is less than 5 mm. In the fine-grained industrial solid waste, the mass percentage of particles with a diameter of 2-5 mm is no more than 25%, the mass percentage of particles with a diameter of 0-0.075 mm is no more than 30%, and the moisture content is no more than 60%. The composite curing agent comprises industrial solid waste and alkaline solid waste rich in active silica-alumina materials; The industrial solid waste rich in active silicon-aluminum materials is a mixture of two or more types of materials, including ultrafine slag powder, ball-milled smelting slag powder, decarburized coal gangue powder, and steel slag powder. The alkaline solid waste includes one or more of the following: distillation waste residue from soda ash production, alkali washing sludge, and white or green mud from alkali pulping. The expansion control component is selected from at least one of fly ash microspheres, ultrafine fly ash, and spherical silica. The anti-shrinkage component is selected from at least one of decommissioned wind turbine blade fibers, waste tire cord, and straw fibers; The saturated component is selected from at least one of ball-milled coal slag, diatomaceous earth, recycled construction waste powder, and waste clay ceramsite. The mass ratio of the industrial solid waste rich in active silicon-aluminum materials to the alkaline solid waste is 0.8~0.9:0.1~0.2; The industrial solid waste rich in active silicon-aluminum materials has a silicon-to-aluminum ratio of 1.7-2.2, a calcium-to-silicon ratio of 0.5-1.0, and a sodium-to-aluminum ratio of 0.6-1.

0. The pH value of the leaching solution of the alkaline solid waste is not less than 10.

5.

2. The all-solid waste fluidized solidification packing as described in claim 1, characterized in that, The industrial solid waste rich in active silicon-aluminum materials has a moisture content of no more than 1%. When using a mixture of ultrafine slag powder, ball-milled smelting slag powder, decarburized coal gangue powder, and steel slag powder, the mass ratio of the four is 0.6~1:0.2~0.6:0.2~0.4:0~1. And / or, the specific surface area of ​​the ultrafine slag powder is not less than 600 m². 2 / kg, grade not lower than S115, specific surface area of ​​ball-milled smelting slag powder, decarburized coal gangue powder, and steel slag powder not less than 400 m² 2 / kg; And / or, the smelting slag powder is at least one of smelting copper slag or smelting nickel slag, and when a mixture is used, the mass ratio of the two is 0.2~0.4:0.6~0.

8.

3. The all-solid waste fluidized solidification packing as described in claim 1, characterized in that, When using soda ash to produce a mixture of distillation waste residue, alkali washing sludge, and alkali pulping white mud or green mud, the mass ratio of the three is 0.4~0.7:0.2~0.4:0.1~1; And / or, the moisture content of alkaline solid waste is not greater than 1%, and the particle size is not greater than 0.075 mm.

4. The all-solid waste fluidized solidification packing as described in claim 1, characterized in that, When the expansion control component is a mixture of fly ash microspheres, ultrafine fly ash, and spherical silica, the mass ratio of the three components is 0.6~0.8:0.1~0.2:0.1~1; and / or, the specific surface area of ​​the expansion control component is not less than 400 m². 2 / kg, moisture content not greater than 2%.

5. The all-solid waste fluidized solidification packing as described in claim 1, characterized in that, When the anti-shrinkage component is a mixture of decommissioned wind turbine blade fiber, waste tire cord and straw fiber, the volume ratio of the three is 0.4~0.7:0.2~0.8:0.1~0.3; and / or, the moisture content is not greater than 5%; and / or, the length of the anti-shrinkage component is not greater than 2 cm.

6. The all-solid waste fluidized solidification packing as described in claim 1, characterized in that, When the saturated component is a mixture of ball-milled coal slag, diatomaceous earth, recycled construction waste powder, and waste clay ceramsite, the mass ratio of the four components is 0.1~0.5:0.1~1:0.2~1:0.2~1; and / or, the water content of the saturated component is less than 1%, and the particle size is less than 0.3 mm.

7. The preparation method of the all-solid waste fluidized solidified packing as described in claim 1, characterized in that, Includes the following steps: (1) Weigh out the specified mass of fine-grained industrial solid waste, composite curing agent, expansion control component, anti-shrinkage component, saturated component and water; (2) Add fine-grained industrial solid waste, composite solidifying agent, and expansion control component to water in sequence, stir, and obtain a mixed system; (3) Add the anti-shrinkage component and the water-saturated component to the mixture in step (2) in sequence, stir, and cast into shape to obtain the final product.

8. The preparation method according to claim 7, characterized in that, In step (2), stir for 3 to 5 minutes; stir speed 200 to 400 rpm; and / or, in step (3), stir for 2 to 4 minutes; stir speed 200 to 400 rpm.

9. The application of the all-solid waste fluidized solidified filler as described in any one of claims 1-6 in roadbed engineering, foundation pit engineering, mining engineering or municipal engineering.

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