WO2024120065A1

WO2024120065A1 - Mine tailing-derived self-forming material and use thereof

Info

Publication number: WO2024120065A1
Application number: PCT/CN2023/128191
Authority: WO
Inventors: 吴振军; 解修强; 瞿双林; 杨文�; 黄中原; 张晓兵
Original assignee: 湖南大学
Priority date: 2022-12-06
Filing date: 2023-10-31
Publication date: 2024-06-13
Also published as: CN115557727B; CN115557727A

Abstract

A mine tailing-derived self-forming material and the use thereof. The mine tailing-derived self-forming material comprises a full-tailing modified micro powder and a formulating agent, wherein the full-tailing modified micro powder is prepared by mixing and grinding full tailing, a metal smelting slag and a modifier, the modifier comprising calcium citrate, organic fluorine-based calcium sulfonate and water; and the formulating agent is composed of 60 wt% of an aqueous isopentenol polyoxyethylene ether solution, a mixture of a biomass-derived fiber and a thickener, and a K12/saponin composite air-entraining agent. Furthermore, the mine tailing-derived self-forming material can be used for preparing a full-tailing-based forming material and concrete.

Description

A kind of ore tailings derived molding material and its application

Technical Field

The invention belongs to the technical field of industrial solid waste resource utilization and building materials, and in particular relates to a molding material derived from mine tailings, and its application in mine tailings-based molding materials and concrete.

Background technique

Due to the cumbersome screening, collection and processing process of whole tailings, which is energy-consuming and time-consuming, produces high dust pollution, and is restricted by its function and transportation distance, the market demand for whole tailings products is not large. The total amount of resource application in related industrial and civil fields in my country is less than 20% of the annual increase in mine tailings, which is far from the national requirement of 60% or even higher resource utilization rate of mineral processing tailings. It is urgent to develop new products and technologies that can directly use whole tailings without screening, so as to realize the large-scale and high-value application of whole tailings for mineral processing.

Taking large ground such as underground garages as an example, epoxy floor paint has been the dominant form in recent years. It uses epoxy resin binders, amine curing agents, organic solvents and organic pigments as main ingredients. It is costly and consumes a lot of fossil resources. Volatile organic compounds cause serious air pollution. It is not water-resistant, easy to scratch and wear, and easy to peel off. It is environmentally unfriendly and has poor durability. As a result, epoxy flooring has been banned from indoor use in developed areas of the Pearl River Delta and the Yangtze River Delta. When the concrete floor begins to set, corundum is ground and rolled into the surface of the ground to obtain a water-resistant, oil-resistant, high-hardness, pollution-free inorganic floor. However, the interface between corundum and concrete has no bonding properties, and the concrete The initial setting time is difficult to control, which leads to a large number of cracks on the concrete corundum floor. As the service life increases, the cracks expand, resulting in fragmentation, shedding and powdering. The price of corundum is high, and the grinding and rolling process of corundum requires a lot of manpower, so the application of concrete/corundum inorganic floor is very limited. In recent years, cement self-leveling floors filled with extremely fine silica sand particles and using resins and leveling agents have appeared. Although they have advantages over manual leveling, they also need to use volatile organic compounds such as resins and leveling agents, so their durability and environmental protection need to be further improved. Relying on high amounts of cement to increase strength leads to a higher price, resulting in a high application cost per unit area. Therefore, in terms of the needs of the ground in the construction field, the market needs to develop high-durability, high-performance cement self-leveling floors. A new type of self-forming floor material with high competitiveness, convenient construction, environmental friendliness, and both aesthetics and protective functions.

Summary of the invention

The purpose of the present invention is to provide a self-molding material derived from mine tailings to solve the current problem of using all tailings to produce high-value resource products and lack of technology. At the same time, it does not contain volatile organic compounds, has low cost, is green and environmentally friendly, is simple to prepare, has a wide range of applications, and has high product added value. It can meet the huge demand for environmentally friendly self-leveling, self-compacting new high-cost-effective products for indoor and outdoor floors and prefabricated parts.

In order to achieve the purpose of the present invention, the present invention provides a mine tailings-derived molding material, characterized in that it includes whole tailings-modified micro powder TMP and a blending agent;

The preparation method of the whole tailings modified micro powder TMP is as follows: by weight, 500 to 900 parts of whole tailings, 100 to 500 parts of metal smelting slag and 0.05 to 0.5% of the modifier AP are mixed and ground for 20 to 60 minutes;

The modifier AP is composed of the following raw materials in weight percentage: 15-30% calcium citrate, 1-20% organic fluorine-based calcium sulfonate and the balance water;

The formulation RA is composed of the following raw materials in parts by weight: 30-80 parts of a 60wt% isopentanol polyoxyethylene ether aqueous solution TWS, 0.1-2 parts of a biomass derived fiber and thickener mixture BFT, and 0.01-0.1 parts of an air entraining agent.

Furthermore, the whole tailings are any one or more of gold ore, tungsten ore, iron ore, copper ore, antimony ore, lead-zinc ore or limestone ore.

Furthermore, the metal smelting slag is any one or more of the water-splashed tank slag from steel smelting, copper smelting, lead-zinc smelting, tungsten smelting, and manganese smelting.

Furthermore, the organic fluorinated calcium sulfonate is any one or both of calcium trifluoromethanesulfonate and calcium perfluorobutylsulfonate.

Furthermore, the preparation method of the biomass-derived fiber and thickener mixture BFT is as follows: 10 parts by weight of plant waste residue are ball-milled for 5 to 20 minutes, and then Disperse with water, add 1-5 parts of 27wt% hydrogen peroxide and stir for 10-20min; then add 5-10 parts of caustic soda flakes and stir for 10-30min at 30-50°C; finally add 5-15 parts of sodium sulfite and stir by air bubbling for 30-60min.

Furthermore, the plant waste residue is composed of waste residue from a reed processing plant and waste residue from a bamboo processing plant in a mass ratio of (1-3):(9-7).

Furthermore, the air entraining agent is a composite of K12 (i.e. sodium dodecyl sulfate) and saponin in a mass ratio of (1-10):(10-1).

The tailings-derived self-molding material provided by the present invention can be applied to all-tailings-based molding materials SSHPM and concrete. The tailings-derived self-molding material is applied to concrete to replace slag powder, reduce cement dosage by 10-20%, improve concrete workability and promote mid- to late-stage strength growth of concrete.

Further, the whole tailings-based molding material SSHPM is composed of the following raw materials in weight percentage: 50-80% whole tailings, 0-20% artificial sand, 10-20% artificial colored sand, 10-35% cement, 1-15% whole tailings modified micro powder TMP and 0.5-3% blending agent RA. Preferably, the whole tailings is one or more of gold, tungsten, iron, copper, antimony, lead-zinc, limestone and other mineral tailings.

The application method of the full tailings-based molding material SSHPM provided by the present invention is: by weight, 20 parts of the full tailings-based molding material SSHPM are mixed and stirred evenly with 1 to 5 parts of water to prepare a floor or prefabricated product that is convenient for real-time construction.

The present invention has used the whole tailings and artificial sand of gold, tungsten, iron, copper, antimony, lead, zinc, limestone and other mines to complete the preparation, application demonstration and performance evaluation of whole tailings modified micro powder and whole tailings-based molding materials in batches, specifically including:

(1) The whole tailings modified fine powder contains 10-50% of water-splashed slag from steel smelting, copper smelting, lead-zinc smelting, tungsten smelting, and manganese smelting. According to the standard "Composite admixtures for concrete" JG/T486-2015, its activity index is between 65-90%. It can replace 10-30% of cement when used in the production of self-forming materials.

(2) With reference to the Test Method for Cement Mortar Strength GB/T 17671-1999 and the Test and Assessment Standard for Concrete Strength GB/T 50107-2010, after the full tailings-based molding material is hardened and molded, it can be adjusted to have flexural and compressive strengths between 5 and 15 MPa and 20 and 90 MPa respectively after 28 days of standard curing, and the surface Mohs hardness can be adjusted to be between 5 and 8.

(3) With reference to the Standard for Test Methods of Basic Properties of Building Mortar JGJ/T70-2009 and the Standard for Quality Control of Concrete GB50164-2011, the water-resistance grade of the full tailings-based molding material after hardening and molding shall not be lower than P6 after 28 days of standard curing.

The present invention has achieved the following beneficial effects:

1. The present invention uses calcium citrate and organic fluorine-based calcium sulfonate as modifiers to transform several typical whole tailings and smelting water-splashed tank slag into micropowders with certain hydration and cementation activity (i.e. whole tailings modified micropowder TMP), which can reduce cement usage and save costs. The present invention uses smelting water-splashed tank slag as a wear-resistant component to replace corundum, "turning waste into treasure", improving the hardness of the material after hardening and molding, and obtaining excellent mechanical properties while lowering the cost.

2. The whole tailings-based molding material of the present invention and its application directly uses whole tailings containing fine sand particles and micropowder as the main raw material. The raw material is cheap and easy to obtain, and the screening process is eliminated, thereby reducing the energy consumption and pollution of the pre-treatment of tailings resources.

3. The present invention adopts waste residues from processing reeds and bamboos with strong renewable capacity, and prepares a fiber and thickener mixture through an emission-free one-pot process. The mixture contains long bamboo fibers, short reed fibers, and thickening components derived from lignin and hemicellulose. The mixture is then compounded with polyether and a composite air-entraining agent to obtain an eco-friendly formulation. When added to the production of molding materials, the toughness, water retention and workability of the molding materials can be improved. The mixture is more environmentally friendly, more cost-effective, and has better compression and flexural properties than using an epoxy resin binder and a leveling agent system.

4. The present invention uses a huge amount of whole tailings from mineral processing, and can also be matched with artificial sand, cement, natural colored sand, smelting water slag, blending agents, etc. to produce a self-forming material with adjustable plasticity, which can meet the needs of diversified application scenarios. It can be used in indoor (including underground space), outdoor (including underwater) and other scenes, and can also produce high-strength prefabricated products, which is extremely Dadi improves the resource utilization rate of all tailings and reduces costs.

5. The mine tailings-derived molding material of the present invention is made of cheap, widely available raw materials, does not contain volatile organic compounds, has low cost, is green and environmentally friendly, is simple to prepare, has a wide range of applications, and has high added value. The prepared full tailings-based molding material can completely replace epoxy flooring, concrete corundum flooring, cement self-leveling and other products.

6. The present invention uses tailings-derived molding materials to prepare tailings-based molding materials or concrete, which can be used simply by mixing with water. The whole process production process is simple, does not require high temperature pressurization, does not require multi-layer construction and subsequent surface polishing treatment, and the obtained floor or prefabricated product has no cracks on the surface, high surface hardness and scratch resistance.

7. The self-forming system produced by the mine tailings derivative system and production process adopted in the present invention has outstanding advantages: strong plasticity, and rapid leveling and screeding forming can be completed by simple pouring combined with roller pushing and pulling; when applied to special-shaped component molds, it can also be quickly and densely filled into various parts of the structure; the mechanical properties such as flexural and compressive strength after forming are better than traditional floor and prefabricated products, especially environmental protection and low carbon, which meets the country's overall requirements for high-value resource utilization of solid waste, carbon emission reduction, and development of high-performance green building materials.

Detailed ways

The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

The following is an explanation of the molding material derived from the mine tailings of the present invention in conjunction with specific embodiments.

Example 1

Preparation of whole tailings modified micro powder TMP:

Weigh 35 parts of calcium citrate, 8 parts of calcium trifluoromethanesulfonate and 7 parts of calcium perfluorobutylsulfonate, add 50 parts of water and disperse by ultrasonic stirring to obtain modifier AP. Tailings, 200 parts of antimony ore tailings, 100 parts of steel smelting water splashing tank slag, add 0.05% AP of the total mass of the above raw materials, mix and grind in a ball mill for 20 minutes to obtain the whole tailings modified micro powder TMP. After testing, it was found that: 45 micron sieve residue was 8.5%, and the 28-day activity index was 81%; TMP-O without adding AP was ground to 45 micron sieve residue of 8.5%, and the 28-day activity index was 69%, which was low in activity and was not used for subsequent applications.

Preparation of formulation RA:

Take 10 parts of waste slag from reed and bamboo processing plants at a mass ratio of 1:9, ball mill for 20 minutes, disperse with 60 parts of water, add 5 parts of 27% hydrogen peroxide and stir for 10 minutes, then add 10 parts of flake caustic soda and stir for 30 minutes at 50°C, and finally add 15 parts of sodium sulfite and stir by air bubbling for 60 minutes to obtain a biomass-derived fiber and thickener mixture BFT. Prepare a 60% isopentanol polyoxyethylene ether aqueous solution TWS, take 60 parts of TWS, 0.1 parts of BFT, and 0.1 parts of K12/saponin composite air entraining agent (the mass ratio of K12 to saponin is 10:1), mix them evenly, and obtain the formulation RA.

Preparation of red full tailings-based molding material SSHPM:

Calculated by mass percentage, gold ore and antimony ore tailings, artificial sand, chicken blood red natural colored sand, P.O42.5 cement, the TMP prepared above and RA were ball-milled and mixed for 60 minutes to obtain a red full tailings-based molding material SSHPM containing 30% of gold ore tailings, 20% of antimony ore tailings, 20% of artificial sand, 10% of chicken blood red colored sand, 15% of cement, 4% of TMP content and 1% of RA content.

Application and performance testing:

Take 20 parts of SSHPM prepared above and mix them with 5 parts of water to make a finished product that can be applied to the ground and prefabricated parts. After hardening and molding in the mold, the flexural and compressive strengths are 6.3MPa and 27.1MPa respectively after 28 days of standard curing; the surface Mohs hardness is 5.5; the impermeability grade is P6 after 28 days of standard curing.

Example 2

Preparation of whole tailings modified micro powder TMP:

Weigh 15 parts of calcium citrate, 5 parts of calcium trifluoromethanesulfonate and 15 parts of perfluorobutanesulfonic acid Calcium, add 65 parts of water and ultrasonically stir and disperse to obtain modifier AP. Weigh 900 parts of tungsten ore tailings and 500 parts of copper smelting water splashing tank slag, add 0.5% AP of the total mass of the above raw materials, mix and grind in a vertical mill for 60 minutes to obtain whole tailings modified micro powder TMP. After testing, it was found that the 45 micron sieve residue was 6.4%, and the 28-day activity index was 85%.

Preparation of formulation RA:

Take 10 parts of waste slag from reed and bamboo processing plants at a mass ratio of 2:8, ball mill for 17 minutes, disperse with 60 parts of water, add 4 parts of 27% hydrogen peroxide and stir for 17 minutes, then add 8 parts of caustic soda at 50°C and stir for 26 minutes, finally add 13 parts of sodium sulfite and stir by air bubbling for 50 minutes to obtain a biomass-derived fiber and thickener mixture BFT. Prepare a 60% mass concentration of isopentanol polyoxyethylene ether aqueous solution TWS, take 80 parts of TWS, 2 parts of BFT, 0.01 parts of K12/saponin composite air entraining agent (the mass ratio of K12 to saponin is 8:2), mix well, and obtain a formulation RA. At the same time, prepare the formulation RA-: the formula and dosage of BFT and K12/saponin composite air entraining agent are the same as those of the above RA, without adding TWS.

Preparation of yellow full tailings-based molding material SSHPM:

Calculated by mass percentage, tungsten tailings, lemon yellow colored sand, P.O 42.5 cement and the prepared TMP were mixed with RA and RA-vertical mills for 50 minutes respectively to obtain yellow tailings-based molding materials SSHPM and SSHPM- containing 60% tungsten tailings, 5% lemon yellow colored sand, 25% cement, 7% TMP and 3% RA.

Application and performance testing:

Take 20 parts of the prepared SSHPM and 2 parts of water and mix them evenly to obtain a finished product that can be applied to the ground and prefabricated parts. After hardening and molding in the mold, the flexural and compressive strengths are 6.9MPa and 35.2MPa respectively after 28 days of standard curing; the surface Mohs hardness is 6.7; and the impermeability grade is P8 after 28 days of standard curing.

However, when SSHPM-without TWS was used, the material was slagy, loose, and had poor workability, so it was not put into the mold for subsequent testing.

Example 3

Preparation of whole tailings modified micro powder TMP:

Weigh 30 parts of calcium citrate, 10 parts of calcium trifluoromethanesulfonate and 5 parts of calcium perfluorobutylsulfonate, add 55 parts of water and disperse by ultrasonic stirring to obtain the modifier AP. Weigh 700 parts of copper mine tailings, 300 parts of copper smelting and 200 parts of steel smelting water-sprayed tank slag, add 0.3% of the total mass of the above raw materials AP, mix and grind in a vertical mill for 50 minutes to obtain the whole tailings modified micro powder TMP. After testing, it was found that the 45 micron sieve residue was 11.6%, and the 28-day activity index was 90%.

Preparation of formulation RA:

Take 10 parts of waste slag from reed and bamboo processing plants at a mass ratio of 4:6, ball mill for 15 minutes, disperse with 60 parts of water, add 3 parts of 27% hydrogen peroxide and stir for 15 minutes, then add 6 parts of caustic soda at 50°C and stir for 20 minutes, finally add 10 parts of sodium sulfite and stir by air bubbling for 40 minutes, and obtain a biomass-derived fiber and thickener mixture BFT. Prepare a 60% mass concentration of isopentanol polyoxyethylene ether aqueous solution TWS, take 50 parts of TWS, 0.5 parts of BFT, 0.05 parts of K12/saponin composite air entraining agent (the mass ratio of K12 to saponin is 6:4), mix evenly, and obtain a formulation RA. At the same time, prepare a comparative formulation RA: without adding BFT, the formulation and dosage of TWS and K12/saponin composite air entraining agent are the same as those of the aforementioned RA.

Preparation of green full tailings-based molding material SSHPM:

Calculated by mass percentage, copper tailings, dark green colored sand, P.I52.5 cement and the TMP prepared above were mixed with RA and RA-vertical mills for 40 minutes respectively to obtain green full tailings-based molding materials SSHPM and SSHPM- containing 50% copper tailings, 10% dark green colored sand, 30% cement, 6% TMP and 4% RA.

Application and performance testing:

Take 20 parts of SSHPM and SSHPM- prepared above and mix them with 1.5 parts of water to make the finished product which can be applied to the ground and prefabricated parts. After hardening and forming in the mold, the flexural and compressive strengths are 9.1MPa and 63.9MPa respectively after 28 days of standard curing; the surface Mohs hardness is 7.8; the anti-seepage grade after 28 days of standard curing is P10.

The water bleeding rate of SSHPM-based self-forming materials is obvious (more than 5%), which does not meet the requirements of engineering applications. It was not put into the mold for further testing.

Example 4

Preparation of whole tailings modified micro powder TMP:

Weigh 20 parts of calcium citrate, 12 parts of calcium trifluoromethanesulfonate and 8 parts of calcium perfluorobutylsulfonate, add 60 parts of water and disperse by ultrasonic stirring to obtain the modifier AP. Weigh 600 parts of iron ore tailings, 300 parts of limestone tailings, and 200 parts of steel smelting water-splashed tank slag, add 0.2% of AP based on the total mass of the above raw materials, mix and grind in a vertical mill for 45 minutes to obtain the whole tailings modified micro powder TMP. After testing, it was found that the 45 micron sieve residue was 10.2%, and the 28-day activity index was 76%.

Preparation of formulation RA:

Take 10 parts of waste scraps from reed and bamboo processing plants at a mass ratio of 7:3, ball mill for 10 minutes, disperse with 60 parts of water, add 2 parts of 27% hydrogen peroxide and stir for 12 minutes, then add 5 parts of caustic soda at 50°C and stir for 15 minutes, finally add 8 parts of sodium sulfite and stir by air bubbling for 30 minutes to obtain a biomass-derived fiber and thickener mixture BFT. Prepare a 60% isopentanol polyoxyethylene ether aqueous solution TWS, take 45 parts of TWS, 0.3 parts of BFT, 0.03 parts of K12/saponin composite air entraining agent (the mass ratio of K12 to saponin is 6:4), mix well, and obtain the formulation RA.

Preparation of green full tailings-based blue molding material SSHPM:

Calculated by mass percentage, the iron ore tailings, sapphire green sand, P.I 52.5 cement, the TMP prepared above and the RA vertical mill were mixed for 30 minutes to obtain a green whole tailings-based blue molding material SSHPM containing 60% copper ore tailings, 5% sapphire green sand, 30% cement, 4% TMP and 1% RA.

Application and performance testing:

Take 20 parts of the prepared SSHPM and 3 parts of water and mix them evenly to obtain a finished product that can be applied to the ground and prefabricated parts. After hardening and molding in the mold, the flexural and compressive strengths are 7.7MPa and 56.1MPa respectively after 28 days of standard curing; the surface Mohs hardness is 7.3; and the impermeability grade is P10 after 28 days of standard curing.

Example 5

C50 pumping concrete production:

Weigh 90 parts of TMP and 2 parts of RA prepared in Example 1, and then pre-mix them with 400 parts of P.O 42.5 cement, 700 parts of granite machine-made sand with a fineness modulus of 2.9, 1100 parts of 5-20 continuously graded granite crushed stone, 158 parts of water, and 6 parts of polycarboxylate water-reducing agent for 2 minutes, and get the mixture out of the machine. The slump/expansion of the mixture after 2 hours are 245/680mm and 235/655mm respectively, the collapse time is 12s, and there is no bottom grabbing and water seepage.

The above mixture was molded and demolded for 24 hours before standard curing. The compressive strengths after 7 days, 28 days and 56 days were measured to be 47.5 MPa, 61.6 MPa and 67.3 MPa respectively; the flexural strength after 28 days was 10.5 MPa.

The above experimental results show that when the modified micro-powder of the whole tailings of the relevant beneficiation is used in high-grade concrete, it can achieve the function similar to that of slag micro-powder in inhibiting early hydration (the strength at 7 days is lower than 100% of the design strength) and promoting reasonable growth of strength in the later period (the strength growth from 7 to 28 days is not less than 10MPa, and the strength growth from 28 days to 56 days is between 10 and 15% of the design strength). Compared with slag micro-powder, the modified micro-powder of the whole tailings of the beneficiation has abundant raw materials, is cheap and easy to obtain, has a simple processing technology and strong consistency controllability. It is a new type of environmentally friendly cementitious material with great potential to replace slag micro-powder in high-grade concrete, reduce the amount of cement in concrete, and thus reduce carbon emissions.

Example 6

C35 underwater pumping concrete production:

Weigh 80 parts of TMP and 3 parts of RA prepared in Example 3, and then pre-mix them with 300 parts of P.O 42.5 cement, 730 parts of limestone machine-made sand with a fineness modulus of 2.7, 1050 parts of 5-25 continuous graded limestone crushed stone, 160 parts of water, and 10 parts of polycarboxylate water reducer for 2 minutes, and get the mixture out of the machine. The slump/spread of the mixture after 2 hours are 230/620mm and 225/610mm respectively, without bottom grabbing, water seepage, or exposed stone.

The above mixture was molded and demoulded for 24 hours and then subjected to standard curing. The compressive strengths at 1 day and 56 days are 31.2 MPa, 44.7 MPa and 48.9 MPa respectively; the flexural strength at 28 days is 8.9 MPa.

The above experimental results show that when the modified micro-powder of the whole tailings of the relevant beneficiation is used in underwater concrete, it can achieve the function of inhibiting the early hydration too fast (the strength at 7 days is lower than 100% of the design strength) similar to that of slag micro-powder and fly ash, promoting the reasonable growth of strength in the later period (the strength growth from 7 to 28 days is not less than 10MPa, and the strength growth from 28 days to 56 days is between 10 and 15% of the design strength), and making the underwater concrete have excellent fluidity, encapsulation, and water retention for a long time, and the setting time is effectively extended. Compared with slag micro-powder and fly ash, the modified micro-powder of the whole tailings of the beneficiation has abundant raw materials, is cheap and easy to obtain, has a simple processing technology and strong consistency controllability. It is a new environmentally friendly cementitious material with great potential to replace slag micro-powder and fly ash in medium and low grade concrete, reduce the amount of cement in concrete, and thus reduce carbon emissions.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

A mine tailings-derived molding material, characterized in that it comprises whole tailings modified micro powder and a blending agent;

The preparation method of the whole tailings modified micro powder is as follows: by weight, 500 to 900 parts of whole tailings, 100 to 500 parts of metal smelting slag and 0.05 to 0.5% of a modifier are mixed and ground for 20 to 60 minutes;

The modifier is composed of the following raw materials in weight percentage: 15-30% calcium citrate, 1-20% organic fluorine-based calcium sulfonate and the balance water;

The formulation is composed of the following raw materials in parts by weight: 30-80 parts of a 60wt% isopentanol polyoxyethylene ether aqueous solution, 0.1-2 parts of a mixture of biomass derived fibers and a thickener, and 0.01-0.1 parts of an air entraining agent.

The preparation method of the biomass-derived fiber and thickener mixture is as follows: taking 10 parts of plant waste residue by weight, ball milling for 5 to 20 minutes, then dispersing with 60 parts of water, adding 1 to 5 parts of 27wt% hydrogen peroxide and stirring for 10 to 20 minutes; then adding 5 to 10 parts of caustic soda flakes and stirring for 10 to 30 minutes at 30 to 50°C; and finally adding 5 to 15 parts of sodium sulfite and stirring by air bubbling for 30 to 60 minutes.

The plant waste residue is composed of waste residue from a reed processing plant and waste residue from a bamboo processing plant in a mass ratio of (1-3):(9-7).
The mine tailings derived from molding material according to claim 1 is characterized in that the whole tailings are any one or more of gold ore, tungsten ore, iron ore, copper ore, antimony ore, lead-zinc ore or limestone ore.
The tailings-derived molding material according to claim 1 is characterized in that the metal smelting slag is any one or more of the water-splashed slag from steel smelting, copper smelting, lead-zinc smelting, tungsten smelting, and manganese smelting.
The tailings-derived molding material according to claim 1, characterized in that the organic fluorinated calcium sulfonate is any one of calcium trifluoromethanesulfonate and calcium perfluorobutylsulfonate. One or two.
The tailings-derived molding material according to claim 1 is characterized in that the air entraining agent is a composite of K12 and saponin in a mass ratio of (1-10): (10-1).
An application of the tailings-derived molding material as described in any one of claims 1 to 5, characterized in that it is applied to all-tailings-based molding materials and concrete.
The application of the mine tailings-derived molding material according to claim 6 is characterized in that the whole tailings-based molding material is composed of the following raw materials in weight percentage: 50-80% whole tailings, 0-20% artificial sand, 10-20% artificial colored sand, 10-35% cement, 1-15% whole tailings modified micropowder and 0.5-3% blending agent.
The use of the tailings-derived molding material according to claim 7 is characterized in that 20 parts of the whole tailings-based molding material are mixed and stirred evenly with 1 to 5 parts of water to form a floor or prefabricated product that is convenient for real-time construction.