A fluidified solidified soil and a method for producing the same

Abstract

This application discloses a fluidized solidified soil and its preparation method, belonging to the field of building materials technology. The fluidized solidified soil is prepared from raw materials comprising the following components: sand and gravel processing tailings and a solidifying agent. Using sand and gravel processing tailings as a base material provides an effective way to recycle and reuse these tailings, with high safety, low pollution hazard, and extremely high economic benefits. The preparation method of the fluidized solidified soil includes the following steps: weighing alkaline materials, siliceous calcium materials, and a regulator, mixing them to prepare a solidifying agent for later use; then mixing the sand and gravel processing tailings with the solidifying agent and adding water, stirring to prepare premixed fluidized solidified soil. The preparation method is simple, helps improve production efficiency, has low process costs, and is more conducive to practical production and application.

Description

Technical Field

[0001] This application relates to the field of building materials technology, specifically to a fluidized solidified soil and its preparation method. Background Technology

[0002] The amount of tailings generated by wet sand making and filter press is enormous. Using wet processing, approximately 0.1 tons of washing tailings are produced for every ton of sand and gravel produced. However, currently, the vast majority of tailings from sand and gravel processing are still disposed of through stockpiling and landfilling. With increasing emphasis on land resources and stricter environmental regulations, stockpiling and landfilling of sand and gravel processing tailings are no longer suitable disposal methods. The increasing difficulty in treating sand and gravel tailings makes the resource-based reuse of these tailings an urgent priority.

[0003] Premixed fluidized solidified soil is a new type of geotechnical material formed by mixing soil, solidifying agent, necessary water, and admixtures. During construction, this material exists in a fluid state, requiring no or only slight vibration for shaping. After curing, it possesses certain strength, water stability, and low permeability. It can be used for backfilling foundation trenches for pipe galleries and buildings, deep foundation pit backfilling, backfilling of mine pits, karst caves, and underground mining areas, foundation replacement and reinforcement, slope treatment, and as a base material for municipal roads or construction roads.

[0004] Currently, solidified soil preparation technology is mainly used for backfilling of excavated soil at engineering sites. Different and suitable solidifying agents need to be selected for solidification treatment according to the soil characteristics. There is no clear technology or method for preparing fluidized solidified soil for tailings containing high stone powder generated during the processing of manufactured sand and gravel. Summary of the Invention

[0005] The purpose of this application is to provide a fluidized solidified soil, which uses sand and gravel processing tailings as the base material, can effectively obtain high-performance fluidized solidified soil, and can effectively reuse sand and gravel processing tailings as a resource. At the same time, it solves the problems of large output of sand and gravel processing tailings, uneconomical treatment methods, and even potential environmental impacts and safety risks.

[0006] Another objective of this application is to provide a method for preparing fluidized solidified soil, which has a simple process and can quickly and efficiently prepare fluidized solidified soil, enabling the reuse of tailings from sand and gravel processing, and has extremely high practical value.

[0007] The technical solution of this application is as follows:

[0008] On the one hand, embodiments of this application provide a fluidized solidified soil, which is prepared from raw materials comprising the following components: sand and gravel processing tailings and a solidifying agent;

[0009] The raw material components of the above-mentioned curing agent include: alkaline materials, siliceous calcium materials, and modifiers;

[0010] The amount of the above-mentioned curing agent is 5-15% of the dry soil mass in the above-mentioned sand and gravel processing tailings.

[0011] On the other hand, this application also provides a method for preparing fluidized solidified soil, which includes the following steps: weighing alkaline materials, siliceous calcium materials and regulators, mixing them to prepare a solidifying agent for later use; then mixing sand and gravel processing tailings with the solidifying agent and adding water, stirring to prepare premixed fluidized solidified soil.

[0012] Compared with the prior art, the embodiments of this application have at least the following advantages or beneficial effects:

[0013] Regarding the first aspect, embodiments of this application provide a fluidized solidified soil, which is prepared from raw materials comprising the following components: sand and gravel processing tailings and a solidifying agent;

[0014] The raw material components of the above-mentioned curing agent include: alkaline materials, siliceous calcium materials, and modifiers;

[0015] The amount of the above-mentioned curing agent is 5-15% of the dry soil mass in the above-mentioned sand and gravel processing tailings.

[0016] This type of fluidized solidified soil is prepared using sand and gravel processing tailings as the base material and a curing agent. The curing agent is mainly composed of alkaline materials and siliceous and calcareous materials. The alkaline materials are used to coordinate and activate the siliceous and calcareous materials, thereby stimulating their gelling activity. Combined with sand and gravel processing tailings, it can effectively improve the strength performance of the finished fluidized solidified soil. At the same time, a regulator is added to enhance its fluidity, ultimately resulting in a finished fluidized solidified soil with excellent performance.

[0017] By limiting the amount of curing agent used to better adapt to the characteristics of sand and gravel processing tailings, additional waste and losses can be avoided without adversely affecting product performance. This helps reduce the production cost of finished products, improve product quality, and further enhance the economic and practical value of the product, fluidized solidified soil.

[0018] Using sand and gravel processing tailings as the main substrate, it provides an effective way to recycle sand and gravel processing tailings, with high safety, low pollution hazard, and extremely high economic benefits.

[0019] Furthermore, in some embodiments of this application, the raw material components of the curing agent, by weight, include: 25-75 parts of alkaline material, 25-75 parts of siliceous calcium material, and 1-4 parts of modifier.

[0020] In the above embodiments, controlling the proportion of raw materials for the curing agent can better coordinate and activate the gelling activity of siliceous and calcium-based materials through alkaline materials, thereby improving the strength performance of the product fluidized solidified soil. Furthermore, by improving its fluidity through regulators, the proportion of raw materials for the curing agent becomes more reasonable, enabling it to be better matched with sand and gravel processing tailings to produce fluidized solidified soil, which is more conducive to practical production applications.

[0021] Furthermore, in some embodiments of this application, the alkaline material is at least one of cement, carbide slag, and quicklime;

[0022] The aforementioned silicon-calcareous material is at least one of mineral powder and steel slag powder.

[0023] In the above embodiments, the alkaline materials and siliceous calcium materials are widely available and inexpensive, enabling the recycling and reuse of industrial by-products or waste, which helps to improve environmental benefits, reduce production costs, and further enhance the economic and practical value of the product, fluidized solidified soil.

[0024] Furthermore, in some embodiments of this application, the aforementioned regulator is any one of polycarboxylate superplasticizer powder, sodium naphthalenesulfonic acid formaldehyde condensate powder, and melamine powder.

[0025] In the above embodiments, by selecting any one of polycarboxylate superplasticizer powder, sodium naphthalene sulfonic acid formaldehyde condensate powder, and melamine powder as a modifier, it is possible to effectively ensure that the solidified soil can obtain better fluidity with relatively low water consumption, thereby further improving its performance.

[0026] Furthermore, in some embodiments of this application, the raw material components of the curing agent, by weight, further include: 1-50 parts of sulfate material and 1-50 parts of aluminosilicate material.

[0027] In the above embodiments, by adding sulfate materials, the sulfate materials can be combined with alkaline materials, and the two work together to activate the siliceous calcium materials, thereby maximizing the cementitious activity of the siliceous calcium materials and further improving the strength performance of the product fluidized solidified soil; the siliceous aluminous materials can further improve the fluidity of the solidified soil, play a role in water retention and improve the later strength, thereby further improving the product performance.

[0028] Furthermore, in some embodiments of this application, the sulfate mentioned above is any one of anhydrous gypsum, hemihydrate gypsum, phosphorus building gypsum, and desulfurized gypsum.

[0029] Furthermore, in some embodiments of this application, the aforementioned aluminosilicate material is any one of fly ash and gasification ash.

[0030] In the above embodiments, the sulfate and aluminosilicate materials are mostly industrial by-products or wastes, which can help reduce the production cost and improve economic efficiency while meeting production needs. Among them, the use of fly ash or gasification ash as aluminosilicate material can further improve the fluidity of the product's solidified soil by utilizing its ball effect, and play a role in water retention and improving product strength.

[0031] Regarding the second aspect, this application also provides a method for preparing fluidized solidified soil, which includes the following steps: weighing alkaline materials, siliceous calcium materials and regulators, mixing them to prepare a curing agent for later use; then mixing sand and gravel processing tailings with the curing agent and adding water, stirring to prepare premixed fluidized solidified soil.

[0032] This method for preparing fluidized solidified soil uses sand and gravel processing tailings as the main raw material, which can effectively realize the resource reuse of sand and gravel processing tailings. The entire preparation process is simple, which helps to improve production efficiency, has low process cost, and is more conducive to practical production and application.

[0033] Furthermore, in some embodiments of this application, the amount of water added is 40-70% of the total mass of the curing agent and the dry soil in the sand and gravel processing tailings. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to specific embodiments.

[0036] Example 1

[0037] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0038] Weigh 25 parts by weight of cement, 75 parts by weight of mineral powder and 2.5 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent, and set aside for later use;

[0039] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0040] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 45% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0041] Example 2

[0042] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0043] Weigh 75 parts by weight of cement, 25 parts by weight of mineral powder and 2.2 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent for later use;

[0044] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0045] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 50% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0046] Example 3

[0047] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0048] Weigh 50 parts by weight of cement, 50 parts by weight of mineral powder and 2.2 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent, and set aside for later use;

[0049] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0050] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 50% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0051] Example 4

[0052] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0053] Weigh 25 parts by weight of cement, 25 parts by weight of phosphate building gypsum, 50 parts by weight of mineral powder and 2.2 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent for later use;

[0054] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0055] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 50% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0056] Example 5

[0057] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0058] Weigh 25 parts by weight of carbide slag, 25 parts by weight of phosphate building gypsum, 50 parts by weight of mineral powder and 2.5 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent for later use;

[0059] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0060] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 50% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0061] Example 6

[0062] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0063] Weigh 25 parts by weight of cement, 25 parts by weight of fly ash, 50 parts by weight of mineral powder and 2 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent, and set aside.

[0064] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0065] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 50% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0066] Example 7

[0067] This embodiment provides a fluidized solidified soil, which is prepared by the following method:

[0068] Weigh 25 parts by weight of carbide slag, 25 parts by weight of quicklime, 20 parts by weight of phosphate building gypsum, 30 parts by weight of mineral powder and 3 parts by weight of polycarboxylate superplasticizer powder, mix them to prepare a curing agent for later use.

[0069] Then, the tailings from sand and gravel processing are mixed with a solidifying agent and water is added, and the mixture is stirred to prepare premixed fluidized solidified soil;

[0070] The amount of solidifying agent added is 15% of the dry soil mass of the sand and gravel processing tailings; the amount of water added is 45% of the total mass of dry soil and solidifying agent in the sand and gravel processing tailings.

[0071] Test case

[0072] The slump / spread and compressive strength of the fluidized solidified soil provided in Examples 1 to 7 of this application were tested according to T / BGEA001-2019 "Technical Standard for Premixed Fluidized Solidified Soil Filling Engineering". The test results are shown in Table 1.

[0073] Table 1

[0074]

[0075]

[0076] As can be seen from the tests, the fluidized solidified soil provided in this application embodiment has slump / spread and compressive strength that meet the relevant standards and has excellent performance.

[0077] In summary, the embodiments of this application provide a fluidized solidified soil and its preparation method. The product, fluidized solidified soil, uses sand and gravel processing tailings as the base material, providing an effective way to recycle sand and gravel processing tailings. It is safe, has low pollution hazards, and has extremely high economic benefits. The preparation method is simple, helps to improve production efficiency, has low process costs, and is more conducive to practical production and application.

[0078] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A fluidized solidified soil, characterized in that, It is made from sand and gravel processing tailings and solidifying agents; The curing agent is composed of 25-75 parts of alkaline material, 25-75 parts of siliceous calcium material, 1-50 parts of sulfate material, 1-50 parts of siliceous aluminum material, and 1-4 parts of regulator. The amount of the curing agent used is 5-15% of the dry soil mass in the sand and gravel processing tailings; The alkaline material is at least one of cement, carbide slag, and quicklime; the siliceous-calcareous material is at least one of mineral powder and steel slag powder. The regulator is any one of polycarboxylate superplasticizer powder, sodium salt of naphthalenesulfonic acid formaldehyde condensate powder, and melamine powder; The sulfate is any one of anhydrous gypsum, hemihydrate gypsum, phosphorus building gypsum, and desulfurized gypsum; The silicon-aluminate material is either fly ash or gasification ash.

2. A method for preparing the fluidized solidified soil as described in claim 1, characterized in that, The process includes the following steps: weighing alkaline materials, siliceous calcium materials, sulfate materials, siliceous aluminum materials and regulators, mixing them to prepare a curing agent for later use; then mixing the sand and gravel processing tailings with the curing agent and adding water, stirring to prepare a premixed fluidized solidified soil.

3. The method for preparing fluidized solidified soil according to claim 2, characterized in that, The amount of water added is 40-70% of the total mass of the curing agent and the dry soil in the sand and gravel processing tailings.

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