A full-phosphorus solid waste-based road material and a preparation method thereof

Abstract

The application provides a full-phosphorus solid waste-based road material and a preparation method thereof, and relates to the field of solid waste disposal. The full-phosphorus solid waste-based road material comprises a base layer material and a surface layer material. The base layer material comprises, calculated based on the total mass of raw materials as 100%, 90-95% of first collophanite flotation tailings, 5-10% of first activated collophanite flotation tailings, and 0.5-1% of a first modifier. The surface layer material comprises, calculated based on the total mass of raw materials as 100%, 20-30% of a magnesium-based cementitious material, 30-40% of second collophanite flotation tailings, 10-20% of artificial aggregate, and 10-20% of yellow phosphorus slag. The full-phosphorus solid waste-based road material provided by the application fully utilizes the potential cementitious properties of phosphorus tailings, and simultaneously uses original unmodified phosphorus tailings in road materials, thereby greatly improving the utilization rate of phosphorus tailings in road materials. The full-phosphorus solid waste-based road material has the characteristics of high strength, fast hardening, and good durability.

Description

Technical Field

[0001] This application relates to the field of solid waste disposal, and in particular to a total phosphorus solid waste-based road material and its preparation method. Background Technology

[0002] Given the urgent need for reducing and disposing of solid waste such as mine tailings, highway construction, as the largest civil engineering project, has the potential for large-scale tailings disposal. Highway construction consumes large quantities of materials and resources, including steel, cement, gravel, sand, water, high-quality soil, and electronic communication equipment. The road surface base material typically uses stabilized semi-rigid materials such as cement, lime, and fly ash, resulting in significant resource consumption. Each cubic meter of road surface base requires approximately 2 tons of stone and 80-160 kg of cement or lime. Furthermore, the extraction of these raw materials causes natural disasters such as vegetation destruction, landslides, and mudslides. The storage and use of finished products also negatively impact the health of construction workers, pollute the surrounding environment, and lead to gradual ecological degradation. One of the main directions for technological advancement in the future road transportation industry is integrating waste recycling with road engineering to create a new generation of road engineering technology, representing the future development trend of road transportation infrastructure construction technology.

[0003] Highway construction, as the largest civil engineering project, has the potential to dispose of tailings across industries. Road base materials consume a significant amount of stable semi-rigid materials, but the poor activity, high carbonate content, and fine particle size of phosphorus tailings limit their large-scale application in highway engineering materials. In recent years, with increasingly stringent requirements for resource extraction in my country, the prices of raw materials needed for cement production have gradually risen, necessitating the search for new low-carbon alternatives. Summary of the Invention

[0004] The purpose of this application is to provide a novel all-phosphorus solid waste-based road material and its preparation method to solve the above-mentioned problems.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] This application provides a road material based on all-phosphorus solid waste, the all-phosphorus solid waste-based road material comprising a subbase material and a surface material;

[0007] The subbase material, calculated based on the total mass of its raw materials as 100%, includes: 90-95% of the first collophane flotation tailings, 4.5-9% of the first activated collophane flotation tailings, and 0.5-1% of the first conditioning agent.

[0008] The surface material, calculated based on the total mass of its raw materials (100%), includes: 20-30% magnesium-based cementitious material, 30-40% second phosphate rock flotation tailings, 10-20% artificial aggregate, and 10-20% yellow phosphorus slag.

[0009] Optionally, the total mass of the raw materials of the artificial aggregate is calculated as 100%, including: 10-15% of the second collophane flotation tailings, 75-85% of the second activated collophane flotation tailings, and 5-10% of the second conditioning agent.

[0010] Optionally, the total mass of the raw materials of the magnesium-based cementitious material is calculated as 100%, including: 60-70% of the third activated phosphate rock flotation tailings, 15-25% of activated magnesium oxide, and 5-15% of the third conditioning agent.

[0011] Optionally, the first conditioning agent, the second conditioning agent, and the third conditioning agent each independently include magnesium salts.

[0012] Preferably, the magnesium salt includes at least one of magnesium chloride and magnesium sulfate.

[0013] This application also provides a method for preparing a total phosphorus solid waste-based road material, the method comprising:

[0014] Activated collophane flotation tailings are obtained by calcining the collophane flotation tailings.

[0015] The first collophane flotation tailings, the first activated collophane flotation tailings, the first conditioning agent, and water are mixed to obtain the substrate material.

[0016] The surface material is obtained by mixing the artificial aggregate, the second phosphate rock flotation tailings, the magnesium-based cementitious material, the yellow phosphorus slag, and water.

[0017] Optionally, the calcination temperature is 760-800℃ and the time is 1-2 hours.

[0018] Optionally, the method for preparing the artificial aggregate includes: mixing the second phosphate rock flotation tailings, the second activated phosphate rock flotation tailings, the second conditioning agent, and water, followed by granulation and curing for 25-30 days to obtain the artificial aggregate.

[0019] Optionally, the preparation method of the magnesium-based cementitious material includes: mixing the third activated phosphate rock flotation tailings, the activated magnesium oxide, and the third conditioning agent to obtain the magnesium-based cementitious material.

[0020] Optionally, in the substrate material, the liquid-to-solid ratio of water to the solid raw material in the substrate material is 0.08-0.12 ml:1 g.

[0021] Optionally, in the surface material, the liquid-to-solid ratio of water to the solid raw material in the surface material is 0.15-0.18 ml: 1 g.

[0022] Optionally, in the artificial aggregate, the liquid-solid ratio of water to the solid raw material in the artificial aggregate is 0.1-0.12 ml: 1 g.

[0023] Compared with the prior art, the beneficial effects of this application include:

[0024] This application provides a novel road material based on all-phosphorus solid waste, comprising a subbase layer and a surface layer, primarily using phosphate rock flotation tailings and activated phosphate rock flotation tailings as raw materials. Compared to traditional road materials, this novel road material not only has a significant advantage in raw material costs but also offers a new approach for the large-scale utilization of phosphate tailings by leveraging the substantial raw material capacity of road construction. Furthermore, this application fully utilizes the inherent cementing properties of phosphate tailings, combining them with unmodified phosphate tailings to significantly improve their utilization rate in road materials. The road material prepared from phosphorus-based solid waste exhibits high strength, rapid hardening, and good durability, making it suitable for applications such as road repair. It can effectively alleviate the crisis of rising raw material costs and high costs in the road material industry while achieving phosphate tailings reduction, demonstrating strong market potential.

[0025] The preparation method provided in this application makes full use of the natural mineral endowment of high magnesium content in phosphate flotation tailings, which solves the problem of comprehensive utilization of phosphate tailings and provides a low-cost and high-efficiency raw material for the mineral processing industry, and can significantly reduce the raw material and energy consumption costs of cementitious materials. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0027] Figure 1 A schematic diagram illustrating the preparation process of the subbase material in the all-phosphorus solid waste-based road material provided in this embodiment;

[0028] Figure 2 Here is a photograph of the substrate material prepared in Example 1;

[0029] Figure 3 This is a schematic diagram illustrating the preparation process of the surface layer material in the all-phosphorus solid waste-based road material provided in the embodiments;

[0030] Figure 4 This is a physical image of the surface material prepared in Example 1. Detailed Implementation

[0031] As used in this article:

[0032] "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0033] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0034] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0035] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0036] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0037] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0038] To better illustrate the technical solutions provided in this application, the technical solutions of this application will be described in general before specific embodiments.

[0039] In a first aspect, this application provides a road material based on all-phosphorus solid waste, the all-phosphorus solid waste-based road material comprising a subbase material and a surface layer material;

[0040] The subbase material, calculated based on the total mass of its raw materials (100%), includes: 90-95% of first phosphate rock flotation tailings, 4.5-9% of first activated phosphate rock flotation tailings, and 0.5-1% of first conditioning agent.

[0041] Optionally, based on the total mass of the substrate material raw materials as 100%: the amount of the first collophane flotation tailings can be 90%, 91%, 92%, 93%, 94%, 95%, or any value between 90% and 95%; the amount of the first activated collophane flotation tailings can be 4.5%, 5%, 6%, 7%, 8%, 9%, or any value between 4.5% and 9%; the amount of the first conditioning agent can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or any value between 0.5% and 1%.

[0042] The surface material, calculated based on the total mass of its raw materials (100%), includes: 20-30% magnesium-based cementitious material, 30-40% second phosphate rock flotation tailings, 10-20% artificial aggregate, and 10-20% yellow phosphorus slag.

[0043] Optionally, based on the total mass of the surface material raw materials as 100%: the amount of magnesium-based cementitious material can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or any value between 20% and 30%; the amount of the second phosphate rock flotation tailings can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or any value between 30% and 40%; the amount of artificial aggregate can be 10%, 11%, 12%, 13%, 14%, 15%, 6%, 17%, 18%, 19%, 20%, or any value between 10% and 20%; the amount of yellow phosphorus slag can be 10%, 11%, 12%, 13%, 14%, 15%, 6%, 17%, 18%, 19%, 20%, or any value between 10% and 20%.

[0044] In one optional embodiment, the total mass of the raw materials of the artificial aggregate is calculated as 100%, including: 10-15% of second collophane flotation tailings, 75-85% of second activated collophane flotation tailings, and 5-10% of second conditioning agent.

[0045] Optionally, based on the total mass of the artificial aggregate raw materials as 100%: the amount of the second collophane flotation tailings can be 10%, 11%, 12%, 13%, 14%, 15%, or any value between 10% and 15%; the amount of the second activated collophane flotation tailings can be 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, or any value between 75% and 85%; the amount of the second conditioning agent can be 5%, 6%, 7%, 8%, 9%, 10%, or any value between 5% and 10%.

[0046] In one optional embodiment, the total mass of the raw materials for the magnesium-based cementitious material is 100%, comprising: 60-70% of third-activated phosphate rock flotation tailings, 15-25% of activated magnesium oxide, and 5-15% of third-grade conditioning agent.

[0047] Optionally, based on the total mass of the magnesium-based cementitious material raw materials as 100%: the amount of activated phosphate rock flotation tailings can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, or any value between 60% and 70%; the amount of activated magnesium oxide can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or any value between 15% and 25%; the amount of the third conditioning agent can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, or any value between 5% and 15%.

[0048] In one alternative embodiment, the first conditioning agent, the second conditioning agent, and the third conditioning agent each independently comprise a magnesium salt.

[0049] Preferably, the magnesium salt includes at least one of magnesium chloride and magnesium sulfate.

[0050] Secondly, this application also provides a method for preparing a total phosphorus solid waste-based road material, the method comprising:

[0051] The activated collophane flotation tailings are obtained by calcining the collophane flotation tailings.

[0052] The first collophane flotation tailings, the first activated collophane flotation tailings, the first conditioning agent, and water are mixed to obtain the substrate material.

[0053] The surface material is obtained by mixing the artificial aggregate, the second phosphate rock flotation tailings, the magnesium-based cementitious material, the yellow phosphorus slag, and water.

[0054] In one optional embodiment, the calcination temperature is 760-800℃ and the time is 1-2 hours.

[0055] Optionally, the calcination temperature can be 760℃, 765℃, 770℃, 775℃, 780℃, 785℃, 790℃, 795℃, 800℃, or any value between 760℃ and 800℃; the calcination time can be 1h, 2h, or any value between 1h and 2h.

[0056] In one optional embodiment, the method for preparing the artificial aggregate includes: mixing the second phosphate rock flotation tailings, the second activated phosphate rock flotation tailings, the second conditioning agent, and water, followed by granulation and curing for 25-30 days to obtain the artificial aggregate.

[0057] Optionally, the curing time for artificial aggregates can be 25 days, 26 days, 27 days, 28 days, 29 days, 30 days, 31 days, 32 days, 33 days, 34 days, 35 days, or any value between 25 and 35 days.

[0058] In an optional embodiment, the preparation method of the magnesium-based cementitious material includes: mixing the third activated phosphate rock flotation tailings, the activated magnesium oxide, and the third conditioning agent to obtain the magnesium-based cementitious material.

[0059] In one optional embodiment, the liquid-to-solid ratio of water to solid raw material in the substrate material is 0.08-0.12 ml: 1 g.

[0060] Optionally, the liquid-to-solid ratio in the base layer material can be 0.08 ml: 1 g, 0.09 ml: 1 g, 0.10 ml: 1 g, 0.11 ml: 1 g, 0.12 ml: 1 g, or any value between 0.08 and 0.12 ml: 1 g.

[0061] In one optional embodiment, the liquid-to-solid ratio of water to solid raw material in the surface layer material is 0.15-0.18 ml:1 g.

[0062] In one optional embodiment, the liquid-to-solid ratio of water to solid raw materials in the artificial aggregate is 0.1-0.12 ml:1 g.

[0063] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0064] The main components of the phosphate rock flotation tailings used in the examples and comparative examples are: dolomite 83.40%, apatite 11.21%, quartz 3.48%, diopside 0.73%, potassium feldspar 0.24%, pyrite 0.19%, common pyroxene 0.12%, garnet <0.10%, amphibole <0.10%, muscovite <0.10%, anhydrite <0.10%, talc <0.10%, tremolite <0.10%, albite <0.10%, and others 0.24%.

[0065] The yellow phosphorus slag used in the examples and comparative examples has the following composition: 52% CaO, 37.3% SiO2, 3.8% P2O5, 4.9% Al2O3, 0.9% Fe2O3, and 1.1% CaF2.

[0066] Example 1

[0067] This embodiment provides a road material based on all-phosphorus solid waste.

[0068] The base course material for total phosphorus solid waste includes a subbase material and a surface layer material, among which:

[0069] The base material is calculated based on the total mass of its raw materials as 100%, including: 92.5% of the first collophane flotation tailings (original phosphate tailings), 6.75% of the first activated collophane flotation tailings (original phosphate tailings after calcination), and 0.75% magnesium chloride.

[0070] The surface material is calculated based on the total mass of its raw materials as 100%, including: 25% magnesium-based cementitious material (phosphate tailings-based cementitious material), 35% second phosphate flotation tailings (original phosphate tailings), 15% artificial aggregate, and 20% yellow phosphorus slag.

[0071] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 12.5% ​​of the second phosphate rock flotation tailings, 80% of the second activated phosphate rock flotation tailings, and 7.5% magnesium chloride.

[0072] Magnesium-based cementitious materials, calculated based on the total mass of their raw materials (100%), include: 65% activated phosphate rock flotation tailings, 20% activated magnesium oxide, and 15% magnesium chloride.

[0073] This embodiment also provides a method for preparing a full-phosphorus solid waste-based road material:

[0074] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0075] 1.1 Preparation of Subbase Material

[0076] The preparation process of the base layer material is as follows Figure 1 As shown, a substrate material was prepared by mixing 92.5% of the first-stage collophane flotation tailings, 6.75% of the first-stage activated collophane flotation tailings, 0.75% magnesium chloride, and water at a liquid-solid ratio of 0.1 ml: 1 g. Figure 2 As shown.

[0077] 1.2 Preparation of surface layer material

[0078] The preparation process of the surface layer material is as follows Figure 3 As shown.

[0079] 1.2.1 Preparation of artificial aggregates

[0080] The artificial aggregate was obtained by mixing 12.5% ​​of the second collophane flotation tailings, 80% of the second activated collophane flotation tailings, 7.5% magnesium chloride and water at a liquid-solid ratio of 0.16 ml: 1 g and then granulating the mixture and curing it for 28 days.

[0081] 1.2.2 Preparation of magnesium-based cementitious materials

[0082] Magnesium-based cementitious material is obtained by mixing 65% of the third-stage activated phosphate rock flotation tailings, 20% of activated magnesium oxide, and 15% of magnesium chloride.

[0083] 1.2.3 Preparation of surface layer material

[0084] A surface layer material is prepared by mixing 25% magnesium-based cementitious material, 35% second-stage phosphate rock flotation tailings, 20% artificial aggregate, 20% yellow phosphorus slag, and water at a liquid-solid ratio of 0.11 ml: 1 g. Figure 4 As shown.

[0085] Example 2

[0086] This embodiment provides a road material based on all-phosphorus solid waste.

[0087] The base course material for total phosphorus solid waste includes a subbase material and a surface layer material, among which:

[0088] The base material is calculated based on the total mass of its raw materials as 100%, including: 90% of the first phosphate rock flotation tailings, 9.5% of the first activated phosphate rock flotation tailings, and 0.5% magnesium chloride.

[0089] The surface material is calculated based on the total mass of its raw materials as 100%, including: 20% magnesium-based cementitious material, 40% second phosphate rock flotation tailings, 20% artificial aggregate, and 20% yellow phosphorus slag.

[0090] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 10% of the second collophane flotation tailings, 85% of the second activated collophane flotation tailings, and 5% magnesium chloride.

[0091] Magnesium-based cementitious materials are calculated based on the total mass of their raw materials as 100%, including: 70% of the third-stage activated phosphate rock flotation tailings, 15% of activated magnesium oxide, and 15% of magnesium chloride.

[0092] This embodiment also provides a method for preparing a full-phosphorus solid waste-based road material:

[0093] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0094] 1.1 Preparation of Subbase Material

[0095] The substrate material was prepared by mixing 90% of the first collophane flotation tailings, 0.5% of the first activated collophane flotation tailings, 0.5% magnesium chloride, and water at a liquid-solid ratio of 0.08 ml: 1 g.

[0096] 1.2 Preparation of surface layer material

[0097] 1.2.1 Preparation of artificial aggregates

[0098] The artificial aggregate was obtained by mixing 10% of the second collophane flotation tailings, 85% of the second activated collophane flotation tailings, 5% magnesium chloride and water at a liquid-solid ratio of 0.15 ml: 1 g and then granulating the mixture and curing it for 28 days.

[0099] 1.2.2 Preparation of magnesium-based cementitious materials

[0100] A magnesium-based cementitious material is obtained by mixing 70% of the third-stage activated phosphate rock flotation tailings, 15% of activated magnesium oxide, and 15% of magnesium chloride.

[0101] 1.2.3 Preparation of surface layer material

[0102] The surface material is prepared by mixing 30% magnesium-based cementitious material, 40% second phosphate rock flotation tailings, 20% artificial aggregate, 10% yellow phosphorus slag, and water at a liquid-solid ratio of 0.1 ml: 1 g.

[0103] Example 3

[0104] This embodiment provides a road material based on all-phosphorus solid waste.

[0105] The base course material for total phosphorus solid waste includes a subbase material and a surface layer material, among which:

[0106] The base material is calculated based on the total mass of its raw materials as 100%, including: 94.5% of the first phosphate rock flotation tailings, 5% of the first activated phosphate rock flotation tailings, and 0.5% magnesium chloride.

[0107] The surface material is calculated based on the total mass of its raw materials as 100%, including: 30% magnesium-based cementitious material, 30% second phosphate rock flotation tailings, 20% artificial aggregate, and 20% yellow phosphorus slag.

[0108] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 15% of the second collophane flotation tailings, 75% of the second activated collophane flotation tailings, and 10% magnesium chloride.

[0109] Magnesium-based cementitious materials, calculated based on the total mass of their raw materials (100%), include: 60% activated phosphate rock flotation tailings, 25% activated magnesium oxide, and 15% magnesium chloride.

[0110] This embodiment also provides a method for preparing a full-phosphorus solid waste-based road material:

[0111] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0112] 1.1 Preparation of Subbase Material

[0113] The substrate material was prepared by mixing 94.5% of the first collophane flotation tailings, 5% of the first activated collophane flotation tailings, 0.5% magnesium chloride, and water at a liquid-solid ratio of 0.12 ml: 1 g.

[0114] 1.2 Preparation of surface layer material

[0115] 1.2.1 Preparation of artificial aggregates

[0116] The artificial aggregate is obtained by mixing 15% of the second collophane flotation tailings, 75% of the second activated collophane flotation tailings, 10% magnesium chloride and water at a liquid-solid ratio of 0.18 and then granulating the mixture and curing it for 28 days.

[0117] 1.2.2 Preparation of magnesium-based cementitious materials

[0118] A magnesium-based cementitious material is obtained by mixing 60% of the second activated phosphate rock flotation tailings, 25% of activated magnesium oxide, and 15% of magnesium chloride.

[0119] 1.2.3 Preparation of surface layer material

[0120] The surface material is prepared by mixing 20% ​​magnesium-based cementitious material, 40% second phosphate rock flotation tailings, 20% artificial aggregate, 20% yellow phosphorus slag, and water at a liquid-solid ratio of 0.12 ml: 1 g.

[0121] Comparative Example 1

[0122] This comparative example provides a road material based on all-phosphorus solid waste.

[0123] The base course material for total phosphorus solid waste includes only the subbase material, of which:

[0124] The base material is calculated based on the total mass of its raw materials as 100%, including: 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, and 0.75% magnesium chloride.

[0125] This comparative example also provides a method for preparing a road material based on all-phosphorus solid waste:

[0126] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0127] Preparation of base course materials:

[0128] The substrate material was prepared by mixing 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, 0.75% magnesium chloride, and water at a liquid-solid ratio of 0.1 ml: 1 g.

[0129] Comparative Example 2

[0130] This comparative example provides a road material based on all-phosphorus solid waste.

[0131] The base layer material for total phosphorus solid waste substrates only includes the surface layer material, of which:

[0132] The surface material is calculated based on the total mass of its raw materials as 100%, including: 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 20% artificial aggregate, and 20% yellow phosphorus slag.

[0133] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 12.5% ​​of the second phosphate rock flotation tailings, 80% of the activated second phosphate rock flotation tailings, and 7.5% magnesium chloride.

[0134] Magnesium-based cementitious materials, calculated based on the total mass of their raw materials (100%), include: 65% activated phosphate rock flotation tailings, 20% activated magnesium oxide, and 15% magnesium chloride.

[0135] This comparative example also provides a method for preparing a road material based on all-phosphorus solid waste:

[0136] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0137] Preparation of surface layer materials

[0138] (1) Preparation of artificial aggregates

[0139] The artificial aggregate was obtained by mixing 12.5% ​​of the second collophane flotation tailings, 80% of the second activated collophane flotation tailings, 7.5% magnesium chloride and water at a liquid-solid ratio of 0.16 ml: 1 g and then granulating the mixture and curing it for 28 days.

[0140] (2) Preparation of magnesium-based cementitious materials

[0141] Magnesium-based cementitious material is obtained by mixing 65% of the third-stage activated phosphate rock flotation tailings, 20% of activated magnesium oxide, and 15% of magnesium chloride.

[0142] (3) Preparation of surface material

[0143] The surface material is prepared by mixing 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 20% artificial aggregate, 20% yellow phosphorus slag, and water at a liquid-solid ratio of 0.11 ml: 1 g.

[0144] Comparative Example 3

[0145] This comparative example provides a road material based on all-phosphorus solid waste.

[0146] The base course material for total phosphorus solid waste includes a subbase material and a surface layer material, among which:

[0147] The base material is calculated based on the total mass of its raw materials as 100%, including: 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, and 0.75% magnesium chloride.

[0148] The surface material is calculated based on the total mass of its raw materials as 100%, including: 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 15% artificial aggregate, and 20% yellow phosphorus slag.

[0149] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 92.5% of the third phosphate rock flotation tailings and 7.5% magnesium chloride.

[0150] Magnesium-based cementitious materials, calculated based on the total mass of their raw materials (100%), include: 65% activated phosphate rock flotation tailings, 20% activated magnesium oxide, and 15% magnesium chloride.

[0151] This comparative example also provides a method for preparing a road material based on all-phosphorus solid waste:

[0152] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0153] 1.1 Preparation of Subbase Material

[0154] The substrate material was prepared by mixing 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, 0.75% magnesium chloride, and water at a liquid-solid ratio of 0.1 ml: 1 g.

[0155] 1.2 Preparation of surface layer material

[0156] 1.2.1 Preparation of artificial aggregates

[0157] The artificial aggregate was obtained by mixing 100% of the second phosphate rock flotation tailings with water at a liquid-solid ratio of 0.16 ml: 1 g and then granulating the mixture and curing it for 28 days.

[0158] 1.2.2 Preparation of magnesium-based cementitious materials

[0159] Magnesium-based cementitious material is obtained by mixing 65% of the third-stage activated phosphate rock flotation tailings, 20% of activated magnesium oxide, and 15% of magnesium chloride.

[0160] 1.2.3 Preparation of surface layer material

[0161] The surface material is prepared by mixing 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 20% artificial aggregate, 20% yellow phosphorus slag, and water at a liquid-solid ratio of 0.11 ml: 1 g.

[0162] Comparative Example 4

[0163] This comparative example provides a road material based on all-phosphorus solid waste.

[0164] The base course material for total phosphorus solid waste includes a subbase material and a surface layer material, among which:

[0165] The base material is calculated based on the total mass of its raw materials as 100%, including: 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, and 0.75% magnesium chloride.

[0166] The surface material is calculated based on the total mass of its raw materials as 100%, including: 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 15% artificial aggregate, and 20% yellow phosphorus slag.

[0167] The artificial aggregate, calculated based on the total mass of its raw materials (100%), includes: 92.5% of the second-activated phosphate rock flotation tailings and 7.5% magnesium chloride.

[0168] Magnesium-based cementitious materials, calculated based on the total mass of their raw materials (100%), include: 65% activated phosphate rock flotation tailings, 20% activated magnesium oxide, and 15% magnesium chloride.

[0169] This comparative example also provides a method for preparing a road material based on all-phosphorus solid waste:

[0170] After drying and dispersing the collophane flotation tailings, the collophane flotation tailings were calcined at a low temperature of 780℃ for 2 hours to obtain activated collophane flotation tailings.

[0171] 1.1 Preparation of Subbase Material

[0172] The substrate material was prepared by mixing 92.5% of the first collophane flotation tailings, 6.75% of the first activated collophane flotation tailings, 0.75% magnesium chloride, and water at a liquid-solid ratio of 0.1 ml: 1 g.

[0173] 1.2 Preparation of surface layer material

[0174] 1.2.1 Preparation of artificial aggregates

[0175] The artificial aggregate was obtained by mixing 92.5% of the second activated phosphate rock flotation tailings, 7.5% magnesium chloride and water at a liquid-solid ratio of 0.16 ml: 1 g and then granulating it and curing it for 28 days.

[0176] 1.2.2 Preparation of magnesium-based cementitious materials

[0177] Magnesium-based cementitious material is obtained by mixing 65% of the third-stage activated phosphate rock flotation tailings, 20% of activated magnesium oxide, and 15% of magnesium chloride.

[0178] 1.2.3 Preparation of surface layer material

[0179] The surface material is prepared by mixing 25% magnesium-based cementitious material, 35% second phosphate rock flotation tailings, 20% artificial aggregate, 20% yellow phosphorus slag, and water at a liquid-solid ratio of 0.11 ml: 1 g.

[0180] The test results of the road materials prepared in each embodiment and comparative example are shown in Table 1:

[0181] Table 1. Performance of road materials obtained in the examples and comparative examples.

[0182]

[0183] As shown in Table 1, the method for developing a novel all-phosphorus solid waste-based road material provided in this application not only has a significant advantage in raw material cost compared to traditional road materials, but also possesses high strength, rapid hardening, and good durability, making it suitable for applications such as road repair. It can effectively alleviate the crisis of rising raw material costs in the road material industry while reducing the volume of phosphorus tailings. It solves the problem of comprehensive utilization of phosphorus tailings, provides a low-cost raw material for the mineral processing industry, and can significantly reduce the raw material and energy costs of cementitious materials.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0185] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A road material based on all-phosphorus solid waste, characterized in that, Activated collophane flotation tailings are obtained by calcining the collophane flotation tailings. The all-phosphorus solid waste-based road material includes subbase material and surface material; The subbase material, calculated based on the total mass of its raw materials as 100%, includes: 90-95% of the first collophane flotation tailings, 4.5-9% of the first activated collophane flotation tailings, and 0.5-1% of the first conditioning agent. The surface material, calculated based on the total mass of its raw materials as 100%, includes: 20-30% magnesium-based cementitious material, 30-40% second phosphate rock flotation tailings, 10-20% artificial aggregate, and 10-20% yellow phosphorus slag. The total mass of the raw materials of the artificial aggregate is 100%, including: 10-15% of the second collophane flotation tailings, 75-85% of the second activated collophane flotation tailings, and 5-10% of the second conditioning agent. The total mass of the raw materials of the magnesium-based cementitious material is 100%, including: 60-70% activated phosphate rock flotation tailings, 15-25% activated magnesium oxide, and 5-15% third conditioning agent. The first conditioning agent, the second conditioning agent, and the third conditioning agent each independently include magnesium salts.

2. The all-phosphorus solid waste-based road material according to claim 1, characterized in that, The magnesium salt includes at least one of magnesium chloride and magnesium sulfate.

3. A method for preparing the all-phosphorus solid waste-based road material according to claim 1 or 2, characterized in that, include: The first collophane flotation tailings, the first activated collophane flotation tailings, the first conditioning agent, and water are mixed to obtain the substrate material. The surface material is obtained by mixing the artificial aggregate, the second phosphate rock flotation tailings, the magnesium-based cementitious material, the yellow phosphorus slag, and water.

4. The preparation method according to claim 3, characterized in that, The calcination temperature is 760-800℃, and the calcination time is 1-2 hours.

5. The preparation method according to claim 3, characterized in that, The method for preparing the artificial aggregate includes: mixing the second phosphate rock flotation tailings, the second activated phosphate rock flotation tailings, the second conditioning agent, and water, granulating the mixture, and curing it for 25-30 days to obtain the artificial aggregate.

6. The preparation method according to claim 3, characterized in that, The preparation method of the magnesium-based cementitious material includes: mixing the third activated phosphate rock flotation tailings, the activated magnesium oxide, and the third conditioning agent to obtain the magnesium-based cementitious material.

7. The preparation method according to any one of claims 4-6, characterized in that, At least one of the following conditions must be met: a. In the subbase material, the liquid-to-solid ratio of water to the solid raw material in the subbase material is 0.08-0.12 mL:1g; b. In the surface layer material, the liquid-to-solid ratio of water to the solid raw material in the surface layer material is 0.15-0.18 mL: 1 g; c. In the artificial aggregate, the liquid-to-solid ratio of water to the solid raw material in the artificial aggregate is 0.1-0.12 mL:1 g.

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