Continuous basalt fiber and preparation method thereof

Abstract

The invention provides a continuous basalt fiber and a preparation method thereof, and belongs to the technical field of inorganic fiber preparation. The preparation method of the continuous basalt fiber comprises the following steps: uniformly mixing coal gangue ash and biomass ash, and melting to obtain a melt; and carrying out wire drawing on the melt to obtain the continuous basalt fiber.

Description

Technical Field

[0001] The present invention belongs to the technical field of inorganic fiber preparation, and specifically relates to a continuous basalt fiber and a preparation method thereof, and more specifically relates to a continuous basalt fiber using coal gangue lime slag and biomass ash as raw materials and a preparation method thereof. Background Art

[0002] Continuous Basalt Fiber (CBF) is an environmentally friendly inorganic fiber material with excellent properties such as light weight, high strength, high temperature resistance, corrosion resistance, oxidation resistance, radiation protection, thermal insulation and sound insulation. It has broad application prospects in many fields such as aerospace, automobile and shipbuilding, civil engineering and transportation, energy and environment, chemical fire protection, national defense and military industry. Especially in the field of construction, continuous basalt fiber, as a new type of cement reinforcement material, shows excellent performance. It can partially replace steel bars, has excellent compatibility with cement and concrete, can effectively improve the strength of cement-based materials, significantly enhance its crack resistance, and provide a solid guarantee for the stability and durability of building structures. At present, the preparation of continuous basalt fiber mainly uses natural basalt ore as raw material. However, this traditional preparation method has many limitations. On the one hand, natural basalt ore resources are unevenly distributed and difficult to obtain in some areas. Large-scale mining will not only lead to the gradual depletion of resources, but also cause serious damage to the ecological environment, resulting in a series of environmental problems such as vegetation destruction and soil erosion. On the other hand, the cost of preparing continuous basalt fiber using natural basalt ore as raw material is relatively high, which to some extent limits its large-scale promotion and application. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a continuous basalt fiber and a preparation method thereof, in order to at least partially solve the above technical problems. The specific technical solutions provided by the present invention are as follows.

[0004] As a first aspect of the present invention, a method for preparing continuous basalt fiber is provided, comprising: uniformly mixing coal gangue lime slag and biomass ash slag and then melting them to obtain a melt; and drawing the melt to obtain continuous basalt fiber.

[0005] As a second aspect of the present invention, a continuous basalt fiber is provided, which is prepared by the above method.

[0006] In an embodiment of the present invention, a method for preparing continuous basalt fiber (hereinafter referred to as fiber) using gangue lime slag and biomass ash as raw materials is provided. The traditional preparation of continuous basalt fiber mainly relies on natural basalt ore, and the present invention has opened up a new source of raw materials. The use of gangue lime slag and biomass ash, two industrial and domestic wastes, as raw materials realizes the reuse of waste slag, reduces the stockpile of waste slag, reduces the pollution of waste slag to the environment and the occupation of land resources, conforms to the concept of sustainable development, and also reduces the cost of raw materials and improves the utilization rate of resources. Through the treatment and utilization of waste slag, the environmental problems such as harmful gas emissions and leachate pollution of soil and water bodies that may be generated during the natural stacking of waste slag are reduced, which helps to improve the ecological environment and is a green and environmentally friendly preparation process. Compared with the traditional method of preparing continuous basalt fiber using natural basalt as the main raw material, the use of waste slag as a raw material has a wide source and low cost, thereby reducing the production cost of continuous basalt fiber, improving its competitiveness in the market, and facilitating the large-scale promotion and application of continuous basalt fiber. Gangue lime slag and biomass ash slag contain a variety of chemical components. By reasonably controlling the mixing ratio and melting process parameters of the two, the composition and performance of the melt can be adjusted, and then the tensile strength, elastic modulus and other mechanical properties of the prepared continuous basalt fiber can be regulated to meet the needs of different application fields. The preparation method of the continuous basalt fiber provided by the present invention has a relatively simple process flow, and the operation of mixing the waste slag evenly, melting it and then drawing it is easy to implement under existing industrial production equipment and technical conditions, has good process feasibility and scalability, and is convenient for industrial production.

[0007] In the embodiment of the present invention, the continuous basalt fiber prepared by the above method using coal gangue lime slag and biomass ash as raw materials realizes efficient recycling of resources and significantly reduces environmental pollution and raw material costs. The fiber has excellent comprehensive performance, high tensile strength, can withstand large external forces, excellent elastic modulus, and small deformation under force. In the construction field, it can strengthen concrete structures and be used for thermal insulation; in the transportation field, it can help to make automobile and rail transportation parts lighter and more high-performance; in the aerospace field, it can manufacture key structural components and assume the roles of various functional materials, fully meeting the diverse needs of multiple industries, and has extremely broad application prospects and important value. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a flow chart of a method for preparing continuous basalt fiber in an embodiment of the present invention;

[0009] Figure 2 This is a scanning electron microscope image of the continuous basalt fiber in Example 1 of the present invention;

[0010] Figure 3This is a physical picture of the continuous basalt fiber in Example 1 of the present invention;

[0011] Figure 4 This is the X-ray diffraction pattern of the continuous basalt fiber in Example 1 of the present invention. DETAILED DESCRIPTION

[0012] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0013] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0014] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0015] Natural basalt mainly includes the following components by weight: SiO 2 43-58%, Al 2 O 3 11-30%, Fe 2 O 3 +FeO 8-16%, CaO 7-13%, MgO 4-12%, Na 2 O+K 2 O 2.5-6%, TiO 2 0.9-2%. The main components of coal gangue lime slag and biomass ash slag are similar to those of basalt, mainly SiO 2 、Al 2 O3 , Fe 2 O 3 , CaO, MgO, Na 2 O.K 2 O etc.

[0016] On the one hand, my country has a huge output of coal gangue. As of now, the accumulated coal gangue has exceeded 8 billion tons, and it is still growing at a rate of 300-350 million tons per year. Coal gangue power generation is the main way to realize the resource utilization of coal gangue, but in this process, a large amount of coal gangue lime slag will be produced, which also needs subsequent treatment. Coal gangue lime slag mainly includes the following weight percentage components: SiO 2 33.5%, Al 2 O 3 20.8%, Fe 2 O 3 3.9%, CaO 9.1%, MgO 2.5%, SO 3 3.5%, Na 2 O 2.5%, K 2 O 1.6%. On the other hand, my country is a large agricultural country, producing more than 1 billion tons of agricultural and forestry waste every year. After burning or gasifying these agricultural and forestry wastes, they will form a granular powder with low density and large specific surface area, namely biomass ash. Most of the SAF (SiO 2 +Al 2 O 3 +Fe 2 O 3 ) exceeds the standard requirement of Class F volcanic ash (SAF ≥ 70%). Rice husk ash, sugarcane bagasse ash, straw ash and bark ash are common biomass ash. Compared with the solid waste admixtures used in the traditional preparation of continuous basalt fiber, biomass ash has the advantages of low energy consumption, wide sources, low cost and high recycling value.

[0017] At present, the application research of coal gangue lime slag and biomass ash in the field of building materials is mainly concentrated in cement concrete, clay brick additives, ceramics and roadbed filling materials, and there are few ways to utilize them in a resourceful and high-quality manner.

[0018] Based on this, the present invention provides a continuous basalt fiber using gangue lime slag and biomass ash as raw materials and a preparation method thereof. Since the viscosity and flow properties of melts with similar chemical compositions are basically the same, continuous basalt fibers can be prepared using gangue lime slag and biomass ash, which can not only achieve high-quality utilization of solid waste, but also reduce the mining of basalt ore and solve the problem that the quality of basalt ore is unstable and it is difficult to use the pool kiln method for large-scale production.

[0019] As a first aspect of the present invention, a method for preparing continuous basalt fiber is provided, comprising: uniformly mixing coal gangue lime slag and biomass ash slag and then melting them to obtain a melt; and drawing the melt to obtain continuous basalt fiber.

[0020] In an embodiment of the present invention, a method for preparing continuous basalt fiber using coal gangue lime slag and biomass ash as raw materials is provided. The traditional preparation of continuous basalt fiber mainly relies on natural basalt ore, and the present invention has opened up a new source of raw materials. The industrial waste such as coal gangue lime slag and the domestic waste such as biomass ash slag are used as raw materials, and the secondary utilization of waste slag is successfully realized. This not only reduces the amount of waste slag accumulation, reduces the pollution caused by waste slag to the environment, reduces the occupation of land resources, conforms to the concept of sustainable development, but also reduces the cost of raw materials and improves resource utilization. Through the proper treatment and utilization of waste slag, the emission of harmful gases that may be generated when the waste slag is naturally stacked, and the environmental problems such as the pollution of soil and water bodies by leachate are avoided, which is very helpful to improve the ecological environment and is a green and environmentally friendly preparation process. Compared with the traditional method of preparing continuous basalt fiber using natural basalt as the main raw material, the use of waste slag as raw material has a very wide source and is very low in cost, which reduces the production cost of continuous basalt fiber, enhances its competitiveness in the market, and is conducive to the large-scale promotion and application of continuous basalt fiber. Since gangue lime slag and biomass ash slag contain a variety of chemical components, by reasonably controlling the mixing ratio of the two and the melting process parameters, the composition and performance of the melt can be adjusted, and then the tensile strength, elastic modulus and other mechanical properties of the prepared continuous basalt fiber can be regulated to meet the needs of different application fields. The continuous basalt fiber preparation method provided by the present invention has a relatively simple process flow, and the operation of mixing the waste slag evenly, melting it and then drawing it is easy to achieve under existing industrial production equipment and technical conditions, and has good process feasibility and scalability, which is convenient for industrial production.

[0021] According to an embodiment of the present invention, the mass ratio of gangue lime slag to biomass ash slag is 1:3 to 3:1, for example, it can be 1:3, 1:2, 1:1, 2:1, 3:1, preferably 1:2 to 1:3. After the gangue lime slag and biomass ash slag are mixed according to this ratio, a stable melt can be formed during the melting process. The interaction between the various components keeps the temperature, viscosity and other parameters of the melt stable within a certain range, which is conducive to continuous and uniform wire drawing operations, improving production efficiency and product quality stability. The appropriate ratio enables the melt to have good fluidity and spinnability during the wire drawing process, and can be smoothly drawn into continuous fibers, reducing defects such as fiber breakage and uneven thickness, and improving the yield and quality of the fibers. By appropriately increasing the content of biomass ash slag, the melting point and melt viscosity of the melt can be reduced, while accelerating the molding speed of the melt, so that the fiber has a shorter material property, which is conducive to wire drawing.

[0022] According to an embodiment of the present invention, the biomass ash comprises the following components in weight percentage: SiO 2 50-65%, Al 2 O 3 10-20%, Fe 2 O 3 1-10%, CaO 5-20%, MgO 2-10%, Na 2 O 3-10%, K 2 O 3-8%, TiO 2 0.5-2%. Gangue lime slag includes the following components in weight percentage: SiO 2 45-60%, Al 2 O 3 15-30%, Fe 2 O 3 5-20%, CaO 2-10%, MgO 1-8%, Na 2 O 2-8%, K 2 O 1-8%, TiO 2 0.5-3%. The prepared continuous basalt fiber includes the following components in weight percentage: SiO 2 50-60%, Al 2 O 3 12-18%, Fe 2 O 3 8-13%, CaO 7-13%, MgO 2-8%, Na 2 O 2-5%, K 2 O 2-5%, TiO 2 0.8-2%. SiO in coal gangue lime slag and biomass ash 2The content of Al is high and it is the main component of the glass phase. When the two are mixed in a certain proportion, they can form a stable glassy substance, providing a good basis for the preparation of continuous basalt fibers. 2 O 3 It can improve the chemical and thermal stability of the glass phase, making the fiber more stable under high temperature and chemical environment. The components in coal gangue lime slag and biomass ash cooperate with each other. For example, alkaline oxides such as CaO and MgO can reduce the melting point of the glass phase, making the mixed material melt at a relatively low temperature, which is conducive to reducing production energy consumption. At the same time, it can also adjust the physical properties of the glass phase such as viscosity and surface tension, providing good conditions for subsequent wire drawing processes.

[0023] According to an embodiment of the present invention, the biomass ash includes at least one of crop straw ash and forestry waste ash. For example, rice husk ash, bagasse ash, straw ash and bark ash. The use of coal gangue lime slag and biomass ash to prepare continuous basalt fiber is considered mainly based on the following two reasons. On the one hand, the particle size distribution D50 of biomass ash is about 4-17 μm, and the specific surface area is 1250-62100 m 2 / kg, which makes it easier to mix with coal gangue lime slag to form a more homogeneous high-temperature molten glass. On the other hand, the content of CaO and MgO in biomass ash is higher than that in coal gangue lime slag, which is more conducive to the formation of SiO 2 -Al 2 O 3 -CaO-MgO system, giving the fiber a higher elastic modulus and strength.

[0024] According to an embodiment of the present invention, the particle size of the gangue lime slag and the biomass ash is below 200 meshes. A smaller particle size means that the particles are finer, and when the gangue lime slag and the biomass ash are mixed, they can contact and interweave with each other more fully and evenly. At the same time, when the particle size is reduced to below 200 meshes, the specific surface area of ​​the particles is greatly increased. During the melting process, the gangue lime slag and the biomass ash have a larger contact area with the heat, which can not only quickly absorb heat and reduce melting energy consumption, but also accelerate the chemical reaction of the internal components and promote the formation of the glass phase. In addition, the smaller particle size helps to better remove impurities and gases during the mixing and melting process. On the one hand, the fine particles can more fully contact with other substances during stirring and mixing, making it easier for impurities to be wrapped or removed; on the other hand, during the melting process, the gas is more easily discharged from the gaps formed by the fine particles, thereby reducing the bubble content in the melt, improving the purity and uniformity of the melt, and facilitating the production of high-quality continuous basalt fibers.

[0025] According to an embodiment of the present invention, the melting temperature during melting is 1400-1600°C, for example, it can be 1400°C, 1450°C, 1500°C, 1550°C, 1600°C; the melting time is 3-5h, for example, it can be 3h, 3.5h, 4h, 4.5h, 5h. The melting temperature of 1400-1600°C and the melting time of 3-5h can ensure that the gangue lime slag and biomass ash are fully melted. A sufficiently high temperature can overcome the lattice energy between materials, allowing the various components to fully diffuse and fuse to form a uniform melt. Long-term melting can further promote complex physical and chemical reactions, reduce solid particles and impurities in the melt, improve the purity and uniformity of the melt, and provide high-quality raw materials for subsequent wire drawing. The drawing temperature during drawing is 1400-1600°C, for example, 1400°C, 1450°C, 1500°C, 1550°C, 1600°C; the drawing speed is 2.5-15m / s, for example, 2.5m / s, 5m / s, 10m / s, 15m / s. The drawing temperature is controlled at 1400-1600°C, which is close to the melting temperature, so that the melt flowing out of the furnace can always maintain good fluidity and appropriate viscosity, and will not cause local solidification of the melt or excessive viscosity due to sudden temperature changes, ensuring that the drawing process is continuous and stable, and reducing the probability of defects such as uneven thickness and breakage of the fiber. The drawing speed of 2.5-15m / s has a significant effect on the fiber properties. A lower drawing speed (2.5m / s) allows the fiber to have more time to release internal stress during the molding process, making the crystallization more perfect, thereby improving the strength and toughness of the fiber; a higher drawing speed (15m / s) can improve production efficiency and meet the needs of large-scale production. At the same time, rapid drawing can also make the fiber's microstructure more compact, giving the fiber good mechanical properties and surface quality. The appropriate melting time, temperature and faster drawing speed work together to achieve continuous and large-scale production while ensuring fiber quality, effectively improving production efficiency, reducing production costs, and enhancing the market competitiveness of the fiber, making the preparation method more feasible and economical in industrial production.

[0026] According to an embodiment of the present invention, after the continuous basalt fiber is prepared, a textile-enhanced impregnating agent is impregnated on the surface of the continuous basalt fiber. The impregnating agent can fill the tiny flaws and cracks on the fiber surface, strengthen the overall structure of the fiber, and improve the mechanical properties of the continuous basalt fiber, such as tensile strength and bending strength, so that it is less likely to break or be damaged when subjected to external forces. At the same time, a wear-resistant protective film can also be formed on the fiber surface to reduce the damage to the fiber caused by friction during subsequent processing and use, thereby increasing the service life of the fiber. In addition, the protective film can effectively isolate the fiber from direct contact with the external environment, reduce the erosion of the fiber surface due to oxidation, humidity, chemicals and other factors, and prevent the degradation of the fiber surface performance.

[0027] According to an embodiment of the present invention, the textile-enhanced sizing agent includes a water-soluble epoxy resin, a water-soluble polyurethane emulsion, and a color fixing agent. The water-soluble epoxy resin can be closely combined with the surface of the basalt fiber, and effectively fill the tiny pores and defects on the fiber surface. At the same time, the water-soluble epoxy resin has a high strength and modulus after curing, which can improve the tensile and bending resistance of the continuous basalt fiber, and enhance the durability of the fiber in the subsequent use process. In addition, the water-soluble epoxy resin can also give the fiber a certain chemical corrosion resistance, so that the fiber maintains stable performance under different environments, and broadens its application range. The water-soluble polyurethane emulsion forms a soft and elastic protective film on the fiber surface, reduces the damage to the fiber caused by friction, stretching, etc., and improves the flexibility and fatigue resistance of the fiber. At the same time, the water-soluble polyurethane emulsion can wet the fiber surface well, so that the sizing agent is evenly distributed on the fiber, ensuring that the fiber is fully protected, while improving the surface properties of the fiber and reducing the friction coefficient between the fibers. In addition, water-soluble polyurethane emulsion can also improve the water resistance of fibers, prevent water from corroding fibers, and enhance the wear resistance of fibers, thereby extending the service life of fibers. The color fixing agent reacts chemically with the dye molecules on the fiber surface to form a stable chemical bond, thereby preventing fading due to factors such as washing and sun exposure during subsequent processing or use. While fixing the color, a protective film is formed on the fiber surface, which plays a certain protective role on the fiber and reduces the damage to the fiber surface caused by external factors. The color fixing agent can be a coupling agent or a surfactant, such as a silane coupling agent, a titanate coupling agent, an anionic surfactant, a cationic surfactant, and a nonionic surfactant.

[0028] Specifically, in some embodiments of the present invention, the method for preparing continuous basalt fiber is as follows: Figure 1 As shown, including S1-S3.

[0029] S1: Grind the gangue lime slag and biomass ash slag with a ball mill to a size of more than 200 meshes, and mix them into composite ash slag according to different proportions.

[0030] S2: Pour the composite ash into a melting furnace for melting, so that the mixed material forms a uniform melt, wherein the melting temperature is 1400-1600°C and the melting time is 3-5h.

[0031] S3: After the composite ash is fully melted, a single-hole platinum-rhodium alloy crucible is used for wire drawing. The drawing temperature is set to 1400-1600°C and the drawing speed is set to 2.5-15m / s. At the same time, the fiber surface is infiltrated with a textile-enhanced impregnating agent to obtain continuous basalt fiber.

[0032] It should be understood that before mixing the gangue lime slag and the biomass ash, an X-ray fluorescence spectrometer (XRF) can be used to determine the types and contents of elements present in the gangue lime slag and the biomass ash to facilitate adjusting the ratio of the two.

[0033] As a second aspect of the present invention, a continuous basalt fiber is provided, which is prepared by the above method, wherein the diameter of the continuous basalt fiber is 10-30 μm.

[0034] In an embodiment of the present invention, the continuous basalt fiber prepared by the above-mentioned method using coal gangue lime slag and biomass ash as raw materials realizes efficient recycling of resources and significantly reduces environmental pollution and raw material costs. The fiber has excellent comprehensive performance, high tensile strength (single filament strength 1500-2200 MPa), can withstand large external forces, has excellent elastic modulus (single filament elastic modulus 37-56 GPa), and has small deformation under force. In the field of construction, it can strengthen concrete structures while playing the role of thermal insulation; in the field of transportation, it helps to achieve lightweighting of automobiles and rail transit parts and improve their performance; in the field of aerospace, it can be used to manufacture key structural components and can also be used as a variety of functional materials. It fully meets the diverse needs of multiple industries and has extremely broad application prospects and important value.

[0035] The present invention is further described below by examples and related test experiments. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is obvious that one or more embodiments may also be implemented without these specific details. And, in the absence of conflict, the details in the following embodiments may be combined into other feasible embodiments at will. All instruments, consumables and reagents in the following examples, if not otherwise specified, may be obtained from commercial sources.

[0036] Example 1

[0037] In this embodiment 1, continuous basalt fiber was prepared according to the ratio shown in Table 1. The coal gangue lime slag used included the following components in weight percentage: SiO 2 45.5%, Al 2 O 3 17.7%, Fe 2 O 3 11.3%, CaO 9.5%, MgO 1.2%, Na 2 O 2.2%, K 2 O 2.1%, TiO 2 0.7%. The biomass ash used is corn straw ash, which includes the following components in weight percentage: SiO 2 60.1%, Al 2 O 3 11.5%, Fe 2 O 32.8%, CaO 5.1%, MgO 3.5%, Na 2 O 3.2%, K 2 O 7.8%, TiO 2 1.1%.

[0038] Specifically, the preparation method is as follows.

[0039] (1) Raw material pretreatment: Grind the gangue lime slag and biomass ash slag with a ball mill to a size of more than 200 meshes, and mix them into composite ash slag according to different proportions shown in Table 1.

[0040] (2) Uniform melting of raw materials: Pour the composite ash into the melting furnace for melting, so that the mixed materials form a uniform melt, wherein the melting temperature is 1500℃ and the melting time is 3h. After the melt is cooled at room temperature, it becomes a glass body.

[0041] (3) Melt drawing: After the composite ash is fully melted, a single-hole platinum-rhodium alloy crucible is used for drawing. The drawing temperature is set to 1600°C and the drawing speed is set to 17m / s. At the same time, the fiber surface is infiltrated with a textile-enhanced impregnating agent (main ingredients: water-soluble epoxy resin, water-soluble polyurethane emulsion, silane coupling agent, etc.) to obtain continuous basalt fiber.

[0042] Figure 2 This is a scanning electron microscope image of the continuous basalt fiber in Example 1 of the present invention; Figure 3 This is a physical picture of the continuous basalt fiber in Example 1 of the present invention.

[0043] like Figure 2 and Figure 3 As shown, the continuous basalt fiber prepared by the present invention is a brown fiber with a certain metallic luster; the fiber diameter is about 16 μm and is uniform, which ensures that the fiber can be evenly distributed in applications such as composite materials, enhances the consistency of material performance, and is also suitable for some fine processing with specific requirements on fiber fineness; the fiber surface is flat, which reduces friction and stress concentration between fibers, is beneficial to the operation of the fiber during processing such as weaving and winding, and also helps to better combine with the matrix material; it has a certain flexibility, so that the fiber can adapt to complex processing techniques and application scenarios, such as not easy to break under bending, torsion, etc., and can also increase the impact resistance of the material.

[0044] Figure 4 This is the X-ray diffraction pattern of the continuous basalt fiber in Example 1 of the present invention.

[0045] like Figure 4As shown, the glass body and continuous basalt fiber prepared in Example 1 are uniform and homogeneous glass bodies without unmelted crystals. The internal structure of the fiber is uniform, which makes it stable in terms of mechanical properties, thermal properties, etc., and is not prone to performance fluctuations due to local structural differences. The homogeneous state makes the fiber easier to handle in subsequent processing, such as wire drawing and molding, and is not prone to problems such as blockage and breakage, thereby improving processing efficiency and yield. The absence of unmelted crystals avoids defects such as stress concentration that may be caused by the presence of crystals, improves fiber quality and reliability, and enables it to have better application performance in fields such as aerospace and construction that have high requirements for fiber performance.

[0046] Example 2

[0047] In this Example 2, continuous basalt fibers were prepared according to the ratio shown in Table 1, and the specific preparation method was the same as that in Example 1.

[0048] Example 3

[0049] In this Example 3, continuous basalt fibers were prepared according to the ratio shown in Table 1, and the specific preparation method was the same as that in Example 1.

[0050] Example 4

[0051] In this Example 4, continuous basalt fibers were prepared according to the ratio shown in Table 1, and the specific preparation method was the same as that in Example 1.

[0052] Example 5

[0053] In this Example 5, continuous basalt fibers were prepared according to the ratio shown in Table 1, and the specific preparation method was the same as that in Example 1.

[0054] Comparative Example 1

[0055] In this comparative example 1, continuous basalt fiber was prepared using the gangue lime slag in Example 1, and the specific preparation method was the same as that in Example 1.

[0056] Comparative Example 2

[0057] In this comparative example 2, the biomass ash in Example 1 was used to prepare continuous basalt fibers, and the specific preparation method was the same as that in Example 1.

[0058] Table 1 Proportion of coal gangue lime slag and biomass ash slag in Examples 1-5 and Comparative Examples 1-2

[0059]

[0060] Furthermore, the continuous basalt fibers prepared in the above comparative examples and embodiments were subjected to single-filament strength test. The single-filament strength test was conducted on a YG004D-7 pneumatic single-fiber strength tester of Changzhou Huafang Co., Ltd. in accordance with GB / T 3362-2017. Ten single fibers were randomly selected for measurement and the average value was calculated. Pretension: 0.1 cN; clamping distance: 20 mm. The test results are shown in Table 2 below.

[0061] Table 2 Continuous basalt fiber single filament drawing strength in Examples 1-5 and Comparative Examples 1-2

[0062]

[0063] It can be seen from Table 2 that the tensile strength and elastic modulus of the continuous basalt fiber monofilaments of Examples 1-5 are higher than those of Comparative Examples 1-2. Among them, the tensile strength of Comparative Example 1 is 1450MPa and the elastic modulus is 35GPa; the tensile strength of Comparative Example 2 is 1360MPa and the elastic modulus is 33GPa. The tensile strength of Examples 1-5 gradually increased from 1560MPa to 2230MPa, and the elastic modulus increased from 37GPa to 56GPa, showing a trend of gradually increasing tensile strength and elastic modulus with the increase in the amount of biomass ash added, indicating that coal gangue lime slag and biomass ash have a positive effect on the performance improvement of continuous basalt fiber monofilaments, and the performance is significantly optimized and improved compared to the comparative example.

[0064] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing continuous basalt fiber, characterized in that: include: The gangue lime slag and the biomass ash slag are uniformly mixed and then melted to obtain a melt; The melt is drawn to obtain continuous basalt fibers.

2. The method according to claim 1, characterized in that The mass ratio of the coal gangue lime slag to the biomass ash slag is 1:3 to 3:

1.

3. The method according to claim 1, characterized in that The biomass ash comprises the following components in weight percentage: SiO2 50-65%, Al2O3 10-20%, Fe2O3 1-10%, CaO 5-20%, MgO 2-10%, Na2O 3-10%, K2O 3-8%, TiO2 0.5-2%.

4. The method according to claim 3, characterized in that: The biomass ash includes at least one of crop straw ash and forestry waste ash.

5. The method according to claim 1, characterized in that The coal gangue lime slag comprises the following components in weight percentage: SiO2 45-60%, Al2O3 15-30%, Fe2O3 5-20%, CaO 2-10%, MgO 1-8%, Na2O 2-8%, K2O 1-8%, TiO2 0.5-3%.

6. The method according to claim 1, characterized in that The particle sizes of the coal gangue lime slag and the biomass ash slag are below 200 meshes.

7. The method according to claim 1, characterized in that The melting temperature during the melting is 1400-1600° C., and the melting time is 3-5 hours.

8. The method according to claim 1, characterized in that The wire drawing temperature during the wire drawing is 1400-1600° C., and the wire drawing speed is 2.5-15 m / s.

9. The method according to claim 1, characterized in that: Also includes: impregnating the surface of the continuous basalt fiber with a textile-enhancing sizing agent; Wherein, the textile-enhanced sizing agent comprises a water-soluble epoxy resin, a water-soluble polyurethane emulsion, and a color fixing agent.

10. A continuous basalt fiber, characterized in that: The method is prepared by any one of claims 1 to 9.

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