Reinforcing agent for all-solid waste cementing material and preparation method

Abstract

The invention relates to a reinforcing agent for an all-solid waste cementing material and a preparation method, and belongs to the technical field of building material preparation. The reinforcing agent is prepared from the following components in percentage by mass: 10.0 percent to 20.0 percent of desulfurized gypsum, 5.0 percent to 10.0 percent of fluorgypsum, 40.0 percent to 50.0 percent of lithium slag, 20.0 percent to 30.0 percent of furnace slag ash, 5.0 percent to 10.0 percent of anhydrous sodium sulfate and 3.0 percent to 5.0 percent of triethanolamine. Through interaction of chemical components in the desulfurized gypsum, the fluorgypsum, the lithium slag and the furnace slag ash, a multi-synergistic excitation system of sulfate, aluminosilicate and the like is formed, steel slag micro powder and mineral powder in the all-solid waste cementing material are excited, and the early strength performance is improved. Calcium sulphoaluminate crystals generated by reacting anhydrous sodium sulfate with CaO, Al2O3 and other components in the lithium slag and the furnace slag ash have the effects of being insoluble in water and improving the compactness, and have a remarkable contribution to improvement of the material strength. The triethanolamine improves the water-binder ratio and compactness by accelerating the hydration reaction and reducing the water consumption, thereby enhancing the strength and durability of the material.

Description

Technical Field

[0001] The present application relates to the technical field of building material preparation, and in particular to a reinforcing agent for all-solid waste cementitious materials and a preparation method thereof. Background Art

[0002] All-solid waste cementitious materials are made from solid waste resources such as blast furnace slag, steel slag, and desulfurized gypsum. They are ground and produced in a certain proportion at room temperature to produce materials with a certain specific surface area. They react with water to form a material with cementitious properties. The carbon emission intensity of the entire process of all-solid waste cementitious materials production is 160 to 265 kg CO2 emissions. Compared with 531 to 850 kg CO2 emissions per ton of slag silicate cement, the carbon emission reduction rate during the production stage per ton of all-solid waste cementitious materials is 60% to 80%. At the same time, it can reduce 500 kg of carbon oxides produced by explosives and 54.2 kg / km of rock dust below 1 μm produced by gravel. 3 , with good economic and environmental benefits.

[0003] With the continuous development of the construction industry and the steel industry, resource consumption is increasing. How to effectively utilize the solid waste generated during the smelting process to reduce building energy consumption has gradually become a hot topic of concern. Applying industrial solid waste to all-solid waste cementitious materials can not only effectively reduce carbon emissions generated in the production stage of building materials, but also alleviate the environmental pollution caused by the random stacking of solid waste due to difficulties in handling. However, when the all-solid waste cementitious materials undergo hydration reaction, the desulfurized gypsum as an activator completely activates the activity of water slag and steel slag for a relatively long time, and the early strength performance is insufficient. Summary of the invention

[0004] The present application provides a reinforcing agent for all-solid waste cementitious materials and a preparation method thereof, in order to solve the following technical problem: how to improve the early strength performance of all-solid waste cementitious materials.

[0005] In a first aspect, an embodiment of the present application provides a reinforcing agent for all-solid waste cementitious materials, which includes, by mass fraction: desulfurized gypsum: 10.0% to 20.0%, fluorinated gypsum: 5.0% to 10.0%, lithium slag: 40.0% to 50.0%, slag ash: 20.0% to 30.0%, anhydrous sodium sulfate: 5.0% to 10.0%, and triethanolamine: 3.0% to 5.0%.

[0006] Optionally, the CaSO4·2H2O content of the desulfurized gypsum is ≥ 90% by mass.

[0007] Optionally, the CaSO4 content of the fluorgypsum is 80% to 90% by mass.

[0008] Optionally, the components of the lithium slag include: SiO2, Al2O3, SO3, CaO, Fe2O3, MgO and Na2O.

[0009] Optionally, the components of the slag ash include: CaO, SO3, SiO2, Fe2O3 and MgO.

[0010] Optionally, the fineness of the slag ash is 400 mesh to 600 mesh.

[0011] Optionally, the purity levels of the anhydrous sodium sulfate and the triethanolamine are both industrial grade.

[0012] In a second aspect, the present application provides a method for preparing the enhancer described in the first aspect, the method comprising:

[0013] The desulfurized gypsum, the fluorinated gypsum and the lithium slag are sequentially subjected to a first stirring, compounding and grinding to obtain a lithium slag-gypsum composite powder;

[0014] The lithium slag-gypsum composite powder and the slag ash are subjected to a second mixing and compounding process to obtain a reinforcing agent precursor;

[0015] The enhancer precursor, the anhydrous sodium sulfate and the triethanolamine are subjected to a third stirring compounding to obtain an enhancer.

[0016] Optionally, the rotation speed of the first stirring and compounding is 100 r / min to 200 r / min, and the time of the first stirring and compounding is 15 min to 30 min.

[0017] Optionally, the rotation speed of the second stirring and compounding is 150 r / min to 300 r / min, and the time of the second stirring and compounding is 45 min to 60 min.

[0018] Optionally, the rotation speed of the third stirring and compounding is 100 r / min to 200 r / min, and the time of the third stirring and compounding is 30 min to 45 min.

[0019] Optionally, the fineness of the lithium slag-gypsum composite powder is 500 mesh to 800 mesh.

[0020] Optionally, the fineness ratio of the lithium slag-gypsum composite powder to the slag ash is >1.0.

[0021] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0022] The present application provides a reinforcing agent for all-solid waste cementitious materials, which comprises, by mass fraction, 10.0% to 20.0% desulfurized gypsum, 5.0% to 10.0% fluorinated gypsum, 40.0% to 50.0% lithium slag, 20.0% to 30.0% slag ash, 5.0% to 10.0% anhydrous sodium sulfate, and 3.0% to 5.0% triethanolamine. The chemical components such as CaSO4·2H2O in desulfurized gypsum, CaSO4 in fluorinated gypsum, and CaO, SiO2, Al2O3, and SO3 in lithium slag and slag ash interact with each other to form a multi-synergistic excitation system such as sulfate and aluminosilicate, which can excite steel slag powder and mineral powder in the all-solid waste cementitious materials and improve the early strength performance of the all-solid waste cementitious materials. The calcium sulfoaluminate crystals generated by the reaction of anhydrous sodium sulfate with lithium slag, CaO, Al2O3 and other components in slag ash are insoluble in water and improve compactness, making a significant contribution to improving the strength of the material. Triethanolamine increases the water-binder ratio and density by accelerating the hydration reaction and reducing water consumption, thereby enhancing the strength and durability of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic flow chart of a method for preparing a reinforcing agent for all-solid waste cementitious materials provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0028] In this document, the terms including "including" and "including" mean "including but not limited to". Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0029] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this article can be purchased from the market or prepared by existing methods.

[0030] In a first aspect, an embodiment of the present application provides a reinforcing agent for all-solid waste cementitious materials, which includes, by mass fraction: desulfurized gypsum: 10.0% to 20.0%, fluorinated gypsum: 5.0% to 10.0%, lithium slag: 40.0% to 50.0%, slag ash: 20.0% to 30.0%, anhydrous sodium sulfate: 5.0% to 10.0%, and triethanolamine: 3.0% to 5.0%.

[0031] Desulfurization gypsum (English name: desulfurizationgypsum), also known as flue gas desulfurization gypsum, sulfur gypsum or FGD gypsum, is a by-product of the FGD (flue gas desulfurization) process, and its main component is calcium sulfate dihydrate (CaSO4·2H2O). Desulfurization gypsum mainly comes from the flue gas desulfurization process of coal-fired power plants or oil plants. In this process, lime-limestone is ground into a slurry and used as an absorbent to contact the dust-removed SO2-containing flue gas to generate calcium sulfate and calcium sulfite through chemical reactions. The calcium sulfite is then oxidized and converted into calcium sulfate to obtain desulfurization gypsum. In the embodiment of the present application, desulfurization gypsum is used as the main source of calcium sulfate. Its high content of CaSO4·2H2O (≥90%) helps to form a stable sulfate system and enhance the early strength properties of the material.

[0032] Fluorogypsum is a byproduct of producing hydrogen fluoride from sulfuric acid and fluorspar, mainly anhydrous calcium sulfate, with a high calcium sulfate content, which can be used to make building materials and a setting time regulator for cement production. In the embodiment of the present application, fluorogypsum contains 80% to 90% CaSO4, which works together with desulfurized gypsum to further enrich the sulfate system, and may introduce some special crystal structures, which helps to improve the overall performance of the material.

[0033] Lithium slag is solid waste after lithium is extracted from lithium ore, and its main components include SiO2, Al2O3, CaO, etc. Lithium slag can be used as concrete admixture and cement raw material in the construction field, which has the advantages of improving concrete strength and durability, reducing costs, increasing cement efficiency, and reducing environmental pollution. In the embodiment of the present application, the specific chemical composition of lithium slag (SiO2, Al2O3, SO3, etc.) provides a basis for the formation of aluminosilicate system, which can form a complex network structure during the hydration process, enhancing the strength and durability of the material.

[0034] In the embodiments of the present application, slag ash is used as the main calcium source. Its high content of CaO and SO3 reacts with SiO2, Al2O3 and other components in lithium slag to form a variety of beneficial mineral phases, such as calcium sulfoaluminate, which helps to improve the density and strength of the material.

[0035] In the embodiment of the present application, anhydrous sodium sulfate reacts with chemical components such as CaO and Al2O3 in lithium slag and slag ash to produce calcium sulfoaluminate crystals. The calcium sulfoaluminate crystals are insoluble in water and have the function of supporting the skeleton and improving the compactness, so as to achieve the effect of improving the strength of the all-solid waste cementitious material.

[0036] Triethanolamine, chemical formula is C6H 15 NO3 is an amine compound with three hydroxyethyl groups. In the embodiment of the present application, triethanolamine reacts with the all-solid waste cementitious material to undergo a hydration reaction, which consumes a large amount of water in the initial stage and promotes the generation of heat, thereby reducing the amount of water involved in the reaction and evaporation in the hydration reaction, increasing the water-to-binder ratio, and enhancing the density, so as to achieve the effect of improving the strength of the all-solid waste cementitious material.

[0037] The mechanism of action is as follows:

[0038] 1. Multi-synergistic excitation system:

[0039] The sulfate ions in desulfurized gypsum and fluorinated gypsum interact with the components such as CaO, SiO2, Al2O3 in lithium slag and slag ash to form a multi-synergistic excitation system such as sulfate and aluminosilicate. This system can effectively excite the steel slag powder and mineral powder in the all-solid waste cementitious material and improve the early strength performance of the material.

[0040] 2. Formation of calcium sulfoaluminate crystals:

[0041] Anhydrous sodium sulfate reacts with lithium slag, CaO, Al2O3 and other components in slag ash to form water-insoluble calcium sulfoaluminate crystals. These crystals have the effect of improving the density of the material and make a significant contribution to improving the strength of the material.

[0042] 3. The accelerating effect of triethanolamine:

[0043] Triethanolamine accelerates the hydration reaction, reduces water consumption, and increases the water-binder ratio. At the same time, it can also increase the density of the material, thereby enhancing the strength and durability of the material.

[0044] The all-solid waste cementitious material enhancer provided in this application achieves significant improvement in material performance by accurately proportioning a variety of industrial waste components. The multi-synergistic excitation system, the formation of calcium sulfoaluminate crystals, and the accelerating effect of triethanolamine together constitute the efficient mechanism of the enhancer. This innovation not only helps to reduce the emission of industrial waste, but also promotes the application of all-solid waste cementitious materials in more fields, realizing the recycling and sustainable development of resources.

[0045] In some embodiments, the CaSO4·2H2O content of the desulfurized gypsum is ≥ 90% by mass.

[0046] In the embodiments of the present application, desulfurized gypsum is used as the main source of calcium sulfate, and the content of CaSO4·2H2O ≥ 90% helps to form a stable sulfate system and enhance the early strength performance of the material.

[0047] In some embodiments, the CaSO4 content of the fluorgypsum is 80% to 90% by mass.

[0048] Fluorogypsum contains 80% to 90% CaSO4, which works together with desulfurized gypsum to further enrich the sulfate system. It may also introduce some special crystal structures, which helps to improve the overall performance of the material.

[0049] In some embodiments, the components of the lithium slag include: SiO2, Al2O3, SO3, CaO, Fe2O3, MgO and Na2O.

[0050] The specific chemical composition of lithium slag provides the basis for the formation of aluminosilicate systems, which can form a complex network structure during hydration, enhancing the strength and durability of the material.

[0051] In some embodiments, the components of the slag ash include: CaO, SO3, SiO2, Fe2O3 and MgO.

[0052] As the main calcium source, the high content of CaO and SO3 in slag ash reacts with SiO2, Al2O3 and other components in lithium slag to form a variety of beneficial mineral phases, such as calcium sulfoaluminate, which helps to improve the density and strength of the material.

[0053] In some embodiments, the fineness of the slag ash is 400 mesh to 600 mesh.

[0054] Utilizing the differences in fineness of each component to form a reasonable grading system helps to optimize the water distribution and heat release during the hydration process and further improve the performance of the material.

[0055] In some embodiments, the purity levels of the anhydrous sodium sulfate and the triethanolamine are both industrial grade.

[0056] Figure 1 A schematic flow chart of a method for preparing a reinforcing agent for all-solid waste cementitious materials provided in an embodiment of the present application.

[0057] See also Figure 1 In a second aspect, the present application provides a method for preparing the enhancer described in the first aspect, the method comprising:

[0058] S1, sequentially performing a first stirring, compounding and grinding on the desulfurized gypsum, the fluorinated gypsum and the lithium slag to obtain a lithium slag-gypsum composite powder;

[0059] In some embodiments, the rotation speed of the first stirring and compounding is 100 r / min to 200 r / min, and the time of the first stirring and compounding is 15 min to 30 min.

[0060] The desulfurized gypsum, fluorinated gypsum and lithium slag are first mixed and compounded. In the embodiment of the present application, a stirrer with a rotation speed between 100 r / min and 200 r / min is used for stirring, and the stirring time is controlled between 15 min and 30 min. This step ensures that the various raw materials are fully mixed and uniform, providing a good foundation for subsequent ultrafine grinding.

[0061] In some embodiments, the fineness of the lithium slag-gypsum composite powder is 500 mesh to 800 mesh.

[0062] In the embodiment of the present application, the raw materials after the first stirring and compounding are sent to the ultrafine vertical mill for grinding. The ultrafine vertical mill can grind the raw materials to a fineness range of 500 mesh to 800 mesh with its efficient grinding capacity and fine particle size control. The lithium slag-gypsum composite powder of this fineness has high activity and can better react with the raw materials such as slag ash added later.

[0063] S2, performing a second mixing and compounding of the lithium slag-gypsum composite powder and the slag ash to obtain a reinforcing agent precursor;

[0064] In some embodiments, the rotation speed of the second stirring and compounding is 150 r / min to 300 r / min, and the time of the second stirring and compounding is 45 min to 60 min.

[0065] In some embodiments, the fineness ratio of the lithium slag-gypsum composite powder to the slag ash is >1.0.

[0066] The lithium slag-gypsum composite powder is compounded with slag ash. In the embodiment of the present application, a stirrer with a rotation speed between 150r / min and 300r / min is used for stirring, and the stirring time is extended to 45min to 60min. Due to the addition of slag ash, a longer stirring time is required to ensure that the two raw materials are fully mixed and a preliminary chemical reaction occurs. It is worth noting that there is a difference in the fineness of the lithium slag-gypsum composite powder and the slag ash, and the fineness of the lithium slag-gypsum composite powder is greater than that of the slag ash. This fineness difference helps to form more contact points and reaction interfaces in the composite process, thereby improving the efficiency and effect of the composite reaction.

[0067] S3, performing a third stirring compounding of the enhancer precursor, the anhydrous sodium sulfate and the triethanolamine to obtain an enhancer.

[0068] In some embodiments, the rotation speed of the third stirring and compounding is 100 r / min to 200 r / min, and the time of the third stirring and compounding is 30 min to 45 min.

[0069] The enhancer precursor is compounded with anhydrous sodium sulfate and triethanolamine. Anhydrous sodium sulfate and triethanolamine can further improve the performance and stability of the enhancer. In this step, a stirrer with a speed between 100r / min and 200r / min is used for stirring, and the stirring time is controlled between 30min and 45min. Through the compounding and stirring of this step, various raw materials are fully mixed and chemically reacted, and finally a enhancer with excellent performance is formed. The enhancer not only has high strength and durability, but also has good environmental adaptability and construction performance, which can meet the needs of different engineering fields.

[0070] The product prepared by the method for preparing the enhancer is the above-mentioned enhancer. Since the method for preparing the enhancer adopts part or all of the technical solutions of the enhancer embodiment, it at least has all the beneficial effects brought by the technical solutions of the enhancer embodiment, which will not be described one by one here.

[0071] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards / industry standards; if there are no corresponding national standards / industry standards, they are measured in accordance with common international standards, conventional conditions or conditions recommended by the manufacturer.

[0072] Example 1

[0073] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 10.0%, fluorinated gypsum: 5.0%, lithium slag: 50.0%, slag ash: 22.0%, anhydrous sodium sulfate: 8.0%, triethanolamine: 5.0%. The CaSO4·2H2O content of desulfurized gypsum is 92%, the CaSO4 content of fluorinated gypsum is 80%, the fineness of slag ash is 600 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0074] The rotation speed of the first stirring and compounding is 200r / min, and the time of the first stirring and compounding is 15min; the rotation speed of the second stirring and compounding is 150r / min, and the time of the second stirring and compounding is 55min; the rotation speed of the third stirring and compounding is 200r / min, and the time of the third stirring and compounding is 35min; the fineness of the lithium slag-gypsum composite powder is 800 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.3.

[0075] Example 2

[0076] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 16.0%, fluorinated gypsum: 10.0%, lithium slag: 40.0%, slag ash: 20.0%, anhydrous sodium sulfate: 10.0%, triethanolamine: 4.0%. The CaSO4·2H2O content of desulfurized gypsum is 90%, the CaSO4 content of fluorinated gypsum is 90%, the fineness of slag ash is 400 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0077] The rotation speed of the first stirring and compounding is 100 r / min, and the time of the first stirring and compounding is 30 min; the rotation speed of the second stirring and compounding is 300 r / min, and the time of the second stirring and compounding is 45 min; the rotation speed of the third stirring and compounding is 100 r / min, and the time of the third stirring and compounding is 40 min; the fineness of the lithium slag-gypsum composite powder is 600 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.5.

[0078] Example 3

[0079] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 11.0%, fluorinated gypsum: 7.0%, lithium slag: 44.0%, slag ash: 30.0%, anhydrous sodium sulfate: 5.0%, triethanolamine: 3.0%. The CaSO4·2H2O content of desulfurized gypsum is 93%, the CaSO4 content of fluorinated gypsum is 84%, the fineness of slag ash is 500 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0080] The rotation speed of the first stirring and compounding is 150r / min, and the time of the first stirring and compounding is 20min; the rotation speed of the second stirring and compounding is 250r / min, and the time of the second stirring and compounding is 60min; the rotation speed of the third stirring and compounding is 150r / min, and the time of the third stirring and compounding is 30min; the fineness of the lithium slag-gypsum composite powder is 700 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.4.

[0081] Example 4

[0082] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 12.0%, fluorinated gypsum: 9.0%, lithium slag: 46.0%, slag ash: 24.0%, anhydrous sodium sulfate: 6.0%, triethanolamine: 3.0%. The CaSO4·2H2O content of desulfurized gypsum is 91%, the CaSO4 content of fluorinated gypsum is 85%, the fineness of slag ash is 400 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0083] The rotation speed of the first stirring and compounding is 200r / min, and the time of the first stirring and compounding is 25min; the rotation speed of the second stirring and compounding is 200r / min, and the time of the second stirring and compounding is 50min; the rotation speed of the third stirring and compounding is 100r / min, and the time of the third stirring and compounding is 45min; the fineness of the lithium slag-gypsum composite powder is 500 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.25.

[0084] Example 5

[0085] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 12.0%, fluorinated gypsum: 8.0%, lithium slag: 42.0%, slag ash: 26.0%, anhydrous sodium sulfate: 7.0%, triethanolamine: 5.0%. The CaSO4·2H2O content of desulfurized gypsum is 95%, the CaSO4 content of fluorinated gypsum is 81%, the fineness of slag ash is 600 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0086] The rotation speed of the first stirring and compounding is 100 r / min, and the time of the first stirring and compounding is 30 min; the rotation speed of the second stirring and compounding is 150 r / min, and the time of the second stirring and compounding is 45 min; the rotation speed of the third stirring and compounding is 200 r / min, and the time of the third stirring and compounding is 30 min; the fineness of the lithium slag-gypsum composite powder is 700 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.2.

[0087] Example 6

[0088] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 15.0%, fluorinated gypsum: 6.0%, lithium slag: 44.0%, slag ash: 22.0%, anhydrous sodium sulfate: 9.0%, triethanolamine: 4.0%. The CaSO4·2H2O content of desulfurized gypsum is 94%, the CaSO4 content of fluorinated gypsum is 88%, the fineness of slag ash is 500 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0089] The rotation speed of the first stirring and compounding is 150r / min, and the time of the first stirring and compounding is 20min; the rotation speed of the second stirring and compounding is 250r / min, and the time of the second stirring and compounding is 55min; the rotation speed of the third stirring and compounding is 150r / min, and the time of the third stirring and compounding is 35min; the fineness of the lithium slag-gypsum composite powder is 600 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.2.

[0090] Comparative Example 1

[0091] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 15.0%, fluorinated gypsum: 6.0%, lithium slag: 44.0%, slag ash: 22.0%, anhydrous sodium sulfate: 9.0%, triethanolamine: 4.0%. The CaSO4·2H2O content of desulfurized gypsum is 94%, the CaSO4 content of fluorinated gypsum is 88%, the fineness of slag ash is 500 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0092] The rotation speed of the first stirring and compounding is 150r / min, and the time of the first stirring and compounding is 20min; the rotation speed of the second stirring and compounding is 250r / min, and the time of the second stirring and compounding is 55min; the rotation speed of the third stirring and compounding is 150r / min, and the time of the third stirring and compounding is 35min; the fineness of the lithium slag-gypsum composite powder is 500 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.0.

[0093] Comparative Example 2

[0094] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 19.0%, fluorinated gypsum: 6.0%, lithium slag: 44.0%, slag ash: 22.0%, and anhydrous sodium sulfate: 9.0%. The CaSO4·2H2O content of desulfurized gypsum is 94%, the CaSO4 content of fluorinated gypsum is 88%, the fineness of slag ash is 500 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0095] The rotation speed of the first stirring and compounding is 150r / min, and the time of the first stirring and compounding is 20min; the rotation speed of the second stirring and compounding is 250r / min, and the time of the second stirring and compounding is 55min; the rotation speed of the third stirring and compounding is 150r / min, and the time of the third stirring and compounding is 35min; the fineness of the lithium slag-gypsum composite powder is 600 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.2.

[0096] Comparative Example 3

[0097] In terms of mass fraction, the enhancer includes: desulfurized gypsum: 24.0%, fluorinated gypsum: 6.0%, lithium slag: 44.0%, slag ash: 22.0%, and triethanolamine: 4.0%. The CaSO4·2H2O content of desulfurized gypsum is 94%, the CaSO4 content of fluorinated gypsum is 88%, the fineness of slag ash is 500 mesh, and anhydrous sodium sulfate and triethanolamine are both industrial grade.

[0098] The rotation speed of the first stirring and compounding is 150r / min, and the time of the first stirring and compounding is 20min; the rotation speed of the second stirring and compounding is 250r / min, and the time of the second stirring and compounding is 55min; the rotation speed of the third stirring and compounding is 150r / min, and the time of the third stirring and compounding is 35min; the fineness of the lithium slag-gypsum composite powder is 600 mesh, and the ratio of the fineness of the lithium slag-gypsum composite powder to the slag ash is 1.2.

[0099] The solid waste cementitious material (S95 ore powder content of 55%, hot press slag powder content of 25%, refined slag powder content of 5%, desulfurized gypsum content of 15%, fineness of 350-400 mesh) was used as the cementitious material, and the reinforcing agent was added at a content of 10% in the solid waste cementitious material to prepare a series of solid waste cementitious material samples mixed with reinforcing agent. The mechanical properties of the solid waste cementitious material samples mixed with reinforcing agent were tested according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The results are shown in Table 1.

[0100] Table 1

[0101]

[0102]

[0103] It can be seen from Table 1 that the strength of the all-solid waste cementitious material of the embodiment is improved.

[0104] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0105] The preparation method of the embodiment of the present invention has the advantages of simple process, convenient operation, and wide source of raw materials.

[0106] The embodiments of the present invention utilize solid waste materials to prepare high-performance reinforcing agents, which not only solves the problem of solid waste treatment, but also promotes the recycling of resources and the sustainable development of the economy.

[0107] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown in the present application, but will conform to the widest range consistent with the principles and novel features applied for by the present application.

Claims

1. A reinforcing agent for all-solid waste cementitious materials, the reinforcing agent comprising, by mass fraction: Desulfurized gypsum: 10.0%~20.0%, fluorinated gypsum: 5.0%~10.0%, lithium slag: 40.0%~50.0%, slag ash: 20.0%~30.0%, anhydrous sodium sulfate: 5.0%~10.0%, triethanolamine: 3.0%~5.0%.

2. The enhancer according to claim 1, characterized in that Calculated by mass fraction, the CaSO4·2H2O content of the desulfurized gypsum is ≥90%.

3. The enhancer according to claim 1, characterized in that Calculated by mass fraction, the CaSO4 content of the fluorgypsum is 80% to 90%.

4. The enhancer according to claim 1, characterized in that The components of the lithium slag include: SiO2, Al2O3, SO3, CaO, Fe2O3, MgO and Na2O.

5. The enhancer according to claim 1, characterized in that The components of the slag ash include: CaO, SO3, SiO2, Fe2O3 and MgO.

6. The enhancer according to claim 1, characterized in that The fineness of the slag ash is 400-600 meshes.

7. The enhancer according to claim 1, characterized in that The purity levels of the anhydrous sodium sulfate and the triethanolamine are both industrial grade.

8. A method for preparing the enhancer according to any one of claims 1 to 7, comprising: The desulfurized gypsum, the fluorinated gypsum and the lithium slag are sequentially subjected to a first stirring, compounding and grinding to obtain a lithium slag-gypsum composite powder; The lithium slag-gypsum composite powder and the slag ash are subjected to a second mixing and compounding process to obtain a reinforcing agent precursor; The enhancer precursor, the anhydrous sodium sulfate and the triethanolamine are subjected to a third stirring compounding to obtain an enhancer.

9. The method according to claim 8, characterized in that The rotation speed of the first stirring and compounding is 100 r / min to 200 r / min, and the time of the first stirring and compounding is 15 min to 30 min; and / or, The rotation speed of the second stirring and compounding is 150 r / min to 300 r / min, and the time of the second stirring and compounding is 45 min to 60 min; and / or, The rotation speed of the third stirring and compounding is 100 r / min to 200 r / min, and the time of the third stirring and compounding is 30 min to 45 min; and / or, The fineness of the lithium slag-gypsum composite powder is 500-800 meshes.

10. The method according to claim 8, characterized in that The fineness ratio of the lithium slag-gypsum composite powder to the slag ash is greater than 1.0.

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