Method for producing high-alkali-corrosion-resistant continuous basalt fiber through multi-component mixing of raw materials

Abstract

The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a method for producing high-alkali-corrosion-resistant continuous basalt fibers through multi-element mixing of raw materials. The chemical composition of the raw materials is adjusted by mixing and homogenizing the multi-element mineral aggregates, and the spinnability of the raw materials is improved; meanwhile, a proper amount of alkali-corrosion-resistant oxide is added, so that the alkali-corrosion-resistant capability of the fiber is improved And a trace amount of atmosphere (oxidation or reduction) regulator is introduced, so that the alkali corrosion resistance of the fiber precursor is comprehensively improved. According to the invention, the high alkali corrosion resistance of the continuous basalt fiber precursor is successfully improved, so that the continuous basalt fiber precursor can meet the application requirements in more severe environments. Meanwhile, the tensile strength and the wire drawing modulus of the fiber precursor are greatly improved, the application range of the fiber precursor in various fields is further widened, and a new opportunity is brought to development of basalt fiber materials.

Description

Technical Field

[0001] The present invention belongs to the field of inorganic non-metallic materials, and particularly relates to a method for producing highly alkali-resistant continuous basalt fibers through multi-component mixing of raw materials. Background Art

[0002] With the rapid development of materials technology, basalt fiber, an inorganic fiber made from silicate lava as raw material and rapidly drawn through a melting-drawing process, has been widely used in many fields such as national defense and military industry, transportation, fireproofing and heat insulation, electric power and new energy, national infrastructure construction, marine and maritime, dielectric materials, and automobile manufacturing due to its green and environmental protection characteristics and excellent comprehensive properties, and is hailed as a new green inorganic fiber material in the 21st century.

[0003] Continuous basalt fiber has remarkable high and low temperature resistance and thermal shock stability, and can maintain stable performance in extreme temperature environments; its thermal conductivity coefficient is relatively low, making it an excellent heat insulation material; it has good electrical insulation and dielectric properties, with great application potential in the electronic field; it has excellent sound absorption and corrosion resistance, and can be used in scenarios with high requirements for acoustic environment and corrosion resistance; its tensile strength and elastic modulus are relatively high, and it can withstand large external forces.

[0004] For a long time, due to the strong alkali corrosion resistance of continuous basalt fiber, it has been widely used in strongly alkali-corrosive environments such as cement concrete and marine and maritime. However, how to further improve its alkali corrosion resistance has always been the focus of attention in the industry.

[0005] Generally, specific ore raw materials have specific mineral compositions and chemical composition contents, which play a leading role in the properties of the fibers made, including alkali corrosion resistance. In recent years, some studies have tried to improve the alkali corrosion resistance of continuous basalt fiber by replacing ore raw materials, but due to the inability to overcome the natural defects of ore raw materials, effective preparation methods have not been found. At present, the product of high alkali-resistant continuous basalt fiber roving is still blank in the market, which to a certain extent limits the in-depth application of basalt fiber in some fields with extremely high requirements for alkali corrosion resistance. Summary of the Invention

[0006] In order to overcome the natural defects in the production of highly alkali-resistant continuous basalt fiber with a single ore raw material, the present invention adjusts the chemical composition of the raw materials through mixing and homogenization of multi-component mineral materials to improve the spinnability of the raw materials; at the same time, an appropriate amount of alkali-resistant oxides is added to improve the alkali corrosion resistance of the fibers; and an atmosphere (oxidation or reduction) regulator is introduced in a trace amount, thereby comprehensively improving the alkali corrosion resistance of the fiber roving and filling the market blank of high alkali-resistant continuous basalt fiber roving products in China.

[0007] Specifically, the technical solution adopted by the present invention is as follows: A method for producing highly alkali-resistant continuous basalt fibers through multi-component blending of raw materials, the method comprising the following steps:

[0008] (1) Raw material selection: Select one or more neutral magmatic rocks with a mass percentage content of SiO 2 greater than or equal to 54% and less than 66% as the main raw material, and select one or more basic-neutral magmatic rocks with a mass percentage content of SiO 2 greater than or equal to 52% and less than 54% as the blending material;

[0009] (2) Raw material ratio: Through material detection means, determine the chemical composition content of the main raw material and the blending material selected in step (1), and determine the ratio of the main raw material to the blending material based on the target component content of the blended raw materials;

[0010] (3) Blending and processing: Mix the proportioned raw materials, then crush, grind, and screen through an 80-100 mesh sieve to obtain the blended raw materials, and conduct sampling inspection to determine that the actual component content of the blended raw materials is within the target component content range;

[0011] (4) Selection and addition of alkali-resistant oxides: Based on the actual components and their contents of the blended raw materials and the expected alkali resistance of the continuous basalt fiber products, determine the types and addition amounts of the alkali-resistant oxides to be added;

[0012] (5) Selection and addition of atmosphere adjusters: Based on the ratio of FeO / (Fe 2 O 3 +FeO) in the actual component content of the blended raw materials, determine the types and addition amounts of the atmosphere adjusters to be added;

[0013] (6) Mix the selected alkali-resistant oxides and atmosphere adjusters with the blended raw materials and conduct homogenization treatment to obtain homogenized powder;

[0014] (7) Fiber production: Conduct wire drawing production on the homogenized powder obtained in step (6) to obtain continuous basalt fibers.

[0015] As used herein, basic-neutral magmatic rocks and neutral magmatic rocks refer to the conventional rock classifications of magmatic rocks in the art based on the mass percentage content of silicon dioxide.

[0016] Further, the neutral magmatic rock includes andesite or diorite.

[0017] Further, the basic-neutral magmatic rock includes basalt, basaltic andesite, diabase, diabase andesite, or pyroxene andesite.

[0018] Furthermore, the mass fraction of total iron in the main material is 6% - 10%, and the mass fraction of total iron in the blending material is 7% - 12%. As used herein, total iron means Fe in the ore 2 O 3 and the total mass fraction of FeO.

[0019] Furthermore, by mass, FeO / (Fe 2 O 3 +FeO) of the main material is 0.2 - 0.6, and FeO / (Fe 2 O 3 +FeO) of the blending material is 0.2 - 0.6.

[0020] Furthermore, the mineral texture of the main material and the blending material is dense or plagiodiastic.

[0021] Furthermore, the quartz mineral content of both the main material and the blending material is ≤15%, the CaO content is ≤9%, and the loss on ignition is ≤2.0%.

[0022] As used herein, the mixed blending material means the mixture of the selected main material and the blending material.

[0023] Furthermore, the target component contents of the mixed blending material in step (2) are: by mass percentage, 56% - 62% SiO 2 、14% - 20% Al 2 O 3 、7% - 11% (Fe 2 O 3 +FeO)、6% - 10% MgO、5% - 8% CaO、1.5% - 3% Na 2 O、2% - 4% K 2 O、1.5% - 5% TiO 2 。

[0024] Furthermore, in the target component contents of the mixed blending material, by mass, FeO / (Fe 2 O 3 +FeO) = 0.2 - 0.6.

[0025] Furthermore, in the target component contents of the mixed blending material, the mass fraction of plagioclase + pyroxene ≥70%.

[0026] Furthermore, the alkali-resistant corrosion oxides are selected from one or more of the following: 1) Network structure strengthening type: SiO 2 、MgO、Li 2 O、BeO、rare earth oxides (including for example: CeO 2 、Y 2 O 3 、Sc 2 O3 , La 2 O 3 etc.); 2) OH - Ion adsorption type: ZrO 2 , Al 2 O 3 , Hf 2 O, TiO 2 ; 3) Fiber surface protective film type: ZrO 2 +TiO 2 , Fe 2 O 3 +Al 2 O 3 , Fe 2 O 3 + Rare earth oxides (including, for example: CeO 2 , Y 2 O 3 , Sc 2 O 3 , La 2 O 3 etc.), Fe 2 O 3 +CaO + hydroxide gel; 4) Network structure interweaving type: P 2 O 5 .

[0027] Furthermore, the alkali-resistant oxide can be added to the mixture in the form of a pure oxide. As used herein, pure oxide means that it contains the oxide with a mass percentage content ≥ 99%.

[0028] Furthermore, the alkali-resistant oxide is added to the mixture in the form of a mineral containing the alkali-resistant oxide.

[0029] Furthermore, one or more or all of the above 4 categories of alkali-resistant oxides (or the minerals contained therein) can be added, and any one or more of the alkali-resistant oxides in each category can be selected.

[0030] Furthermore, the type and addition amount of the alkali-resistant oxide to be added are determined according to the alkali-resistant oxides already contained in the actual composition of the mixture and their contents, as well as the expected alkali resistance of the continuous basalt fiber product. For example, if a certain alkali-resistant oxide is already contained in the mixture, only the insufficient part of this type of oxide required according to the expected alkali resistance of the continuous basalt fiber product needs to be added, while selecting to add the same type or different types of other alkali-resistant oxides (such as enhancing the network structure type, OH -(ion adsorption type, fiber surface protective film type or network structure interweaving type). For another example, if a certain alkali-resistant oxide is already included in the mixed material and the mass percentage content is sufficient, there is no need to add this type of oxide, and the expected alkali-resistant performance of the continuous basalt fiber product can be satisfied by adding other alkali-resistant oxides in the same category or different alkali-resistant oxides in other categories.

[0031] Further, the atmosphere adjuster is selected from one or more of the following: 1) Oxidizing agents: MnO 2 , V 2 O 5 , CeO 2 , NaNO 3 , KMnO 4 , KClO 3 , PbO 2 ; 2) Reducing agents: sodium borohydride (NaBH 4 ), magnesium powder, citric acid, graphite, oxalic acid, oxalic acid.

[0032] Further, by adding an atmosphere adjuster, the oxidation-reduction atmosphere of the mixed material is adjusted to a level of FeO / (Fe 2 O 3 + FeO) ≈ 0.4. Specifically, when the ratio of FeO / (Fe 2 O 3 + FeO) in the actual component content of the mixed material is greater than 0.4 and less than or equal to 0.6, an oxidizing atmosphere adjuster is added; when the ratio of FeO / (Fe 2 O 3 + FeO) in the actual component content of the mixed material is equal to 0.4, no atmosphere adjuster is added; when the ratio of FeO / (Fe 2 O 3 + FeO) in the actual component content of the mixed material is greater than or equal to 0.2 and less than 0.4, a reducing atmosphere adjuster is added. The addition amount of the atmosphere adjuster can be determined as appropriate according to the deviation of the FeO / (Fe 2 O 3 + FeO) ratio from 0.4.

[0033] Further, if the atmosphere agent and the alkali-resistant oxide are the same oxide, there is no need to add it repeatedly due to its dual effect.

[0034] Further, in step (6), the particle size of the alkali-resistant oxide and the atmosphere adjuster mixed with the mixed material is 80 - 100 mesh, preferably the same mesh size as the mixed material.

[0035] Further, in step (6), the component content of the homogenized powder is: by mass percentage, 45% - 55% SiO 2 , 16% - 20% Al2 O 3 、 5% - 11% (Fe 2 O 3 + FeO), 6% - 10% MgO, 3% - 8% CaO, 1% - 3% Na 2 O, 1% - 3% K 2 O, 1% - 6% TiO 2 、 0% - 10% ZrO 2 、 0% - 2% Hf 2 O, 0% - 2% Li 2 O, 0% - 2% BeO, 0% - 10% rare earth oxides (such as: CeO 2 、 Y 2 O 3 、 La 2 O 3 etc.), 0% - 1.5% network structure interwoven oxides (such as: P 2 O 5 ).

[0036] As used herein, the drawing of the homogenized powder is carried out by using the conventional processes well-known in the art. For example, the drawing can be carried out by means of processes such as melting, drawing and forming, and infiltration coating.

[0037] In other aspects, the present invention also provides continuous basalt fibers produced by the method described herein.

[0038] Advantages of the Invention

[0039] By mixing different raw materials in a multi-component manner and moderately optimizing the mass percentages of the raw material minerals and main oxides, the present invention fundamentally changes the chemical composition and structural characteristics of the raw materials. Such optimization not only improves the spinnability of the raw materials and ensures the smoothness of the drawing production process, but also lays a foundation for improving the alkali corrosion resistance of the fibers.

[0040] On the premise of not changing the "naturalness" and "environmental friendliness" advantages of continuous basalt fibers, four types of alkali corrosion-resistant oxides with relatively strong bond strength and no environmental hazards are added in an appropriate amount. Through multiple mechanisms such as enhancing the integrity of the network structure, adsorbing OH- ions, and promoting the formation of a protective film on the fiber surface, the alkali corrosion resistance of the fibers is improved through their synergistic effects. At the same time, the internal structure of the fibers is further optimized, and the comprehensive performance of the fiber rovings is improved.

[0041] A trace amount of atmosphere (oxidation or reduction) regulator is introduced, and the FeO / (Fe 2 O 3The ratio of (Fe₂O₃ + FeO) is such that the homogeneity and thermal conductivity of the glass melt during the fiber drawing production process are greatly improved. This not only facilitates more precise control of the heat permeability and homogeneity of the molten liquid, ensuring continuous and stable industrial production, but also has a positive impact on the alkali corrosion resistance and other physical properties of the fiber.

[0042] Through the above series of innovative measures, the present invention has successfully improved the high alkali corrosion resistance of continuous basalt fiber rovings, enabling them to meet the application requirements in more demanding environments. At the same time, the tensile strength and drawing modulus of the fiber rovings have also increased significantly, further expanding their application scope in various fields and bringing new opportunities for the development of basalt fiber materials. Detailed implementation manners

[0043] The present invention will be further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the technical field.

[0044] Embodiment:

[0045] The present invention provides a method for producing high alkali corrosion resistant continuous basalt fibers through multi-component mixing of raw materials, including:

[0046] (1) Raw material selection: In this embodiment, ores from two ore deposits, namely Huangcaoliang diorite in Wanyuan City, Sichuan Province and Guokaka diorite in Ganzi County, Sichuan Province, are selected as the main materials, and gabbro ore from Wuyicun in Jin Kouhe District, Sichuan Province is selected as the ingredient. The specific information is shown in Table 1.

[0047] Table 1: Participating ore deposits of multi-component mixed raw materials

[0048] Serial number Ore field Rock type Remarks 1# Diorite ore deposit in Huangcaoliang, Wanyuan City, Sichuan Province Diorite Main material 1-1 2# Diorite ore deposit in Guoka, Ganzi County, Sichuan Province Diorite Main material 1-2 3# Diabase ore deposit in Wuyi Village, Jin Kouhe District, Sichuan Province Diabase Ingredient 2-1

[0049] (2) Determine the content of each component in each participating ore. See Table 2.

[0050] Table 2: Chemical composition content table of each participating ore

[0051]

[0052] (3) Batching: According to the target content (i.e., ≥70% plagioclase + pyroxene; 56% - 62% SiO₂, 14% - 20% Al₂O₃, 7% - 11% (Fe₂O₃ + FeO), 6% - 10% MgO, 5% - 8% CaO, 1.5% - 3% Na₂O, 2% - 4% K₂O), 2 、14% - 20%Al₂O₃、7% - 11%(Fe₂O₃ + FeO)、6% - 10%MgO、5% - 8%CaO、1.5% - 3%Na₂O、2% - 4%K₂O), 2 O₂, 14% - 20% Al₂O₃, 7% - 11% (Fe₂O₃ + FeO), 6% - 10% MgO, 5% - 8% CaO, 1.5% - 3% Na₂O, 2% - 4% K₂O), 3 、7% - 11%(Fe₂O₃ + FeO)、6% - 10%MgO、5% - 8%CaO、1.5% - 3%Na₂O、2% - 4%K₂O), 2 O₂, 7% - 11% (Fe₂O₃ + FeO), 6% - 10% MgO, 5% - 8% CaO, 1.5% - 3% Na₂O, 2% - 4% K₂O), 3 +FeO)、6% - 10%MgO、5% - 8%CaO、1.5% - 3%Na₂O、2% - 4%K₂O), 2 O、2% - 4%K₂O), 2O, 1.5%-5% TiO 2 ; FeO / (Fe 2 O 3 +FeO) = 0.2 - 0.6, and the mixing mass percentage of each mixed material is calculated according to the content of each component in Table 2. As shown in Table 3, 35 parts of 1-1# main material, 40 parts of 1-2# main material, and 25 parts of 2-1# ingredient are weighed and mixed according to the mass percentage. The comparative example is composed of only a single ore material of the diabase (ingredient) in Wuyi Village, Jin Kouhe District, Sichuan Province.

[0053] Table 3: Weight percentage of the participating ore

[0054] Ore point Examples 1-6 Comparative example 1-1# (main) 35 0 1-2# (main) 40 0 2-1# (ingredient) 25 100

[0055] (4) The mixed materials of Examples 1-6 are crushed, ground, and sieved (80-100 mesh), and then sampled and tested to ensure that the content of each component in the mixed material is within the required range (if not meeting the requirements, secondary mixing is required) to obtain the mixed powder. The test results of the content of each component of the mixed powder in the examples and the comparative example are shown in Table 4.

[0056] Table 4: Detection content table of each component after ore mixing

[0057]

[0058]

[0059] (5) Add atmosphere adjuster: The mixed material FeO / (Fe 2 O 3 +FeO) = 0.437. By mass percentage, 0.5% MnO 2 oxidizer is selected and added to the mixed materials of each example.

[0060] (6) Add alkali-resistant oxides: According to the main oxides and their contents of the mixed materials, as listed in Table 5, the corresponding alkali-resistant oxides are added to the mixed materials of each example and homogenization treatment is carried out respectively.

[0061] Table 5: Percentage content of alkali-resistant oxides and atmosphere adjusters added to the mixed powder of each example (calculated based on the percentage content of the mixed material)

[0062]

[0063] (7) Drawing production: The homogenized powder obtained in the previous step is gradually added to the tank furnace. After the raw materials in the tank furnace are completely replaced, the melting, drawing forming, and infiltration coating process means are used for drawing production, and the production parameters are recorded to obtain continuous basalt fibers.

[0064] (8) The production efficiency and fiber properties of the basalt fibers are tested, and the results are shown in Table 6.

[0065] Table 6: Melting Parameters and Fiber Properties of Basalt Fiber Raw Materials in Each Example

[0066]

[0067]

[0068]

[0069] As can be seen from Table 6: In Example 1, through the multi-component mixing of raw materials, 6.0% of Al 2 O 3 , 5.0% of MgO, 4.5% of TiO 2 , 1.5% of Li 2 O were introduced, effectively adjusting the chemical composition of the mixed raw materials. At the same time, 0.5% of MnO 2 , a strong oxidation atmosphere regulator, was continuously introduced to precisely control the atmosphere of furnace melting, and the ratio of FeO / (Fe 2 O 3 +FeO) was adjusted to an ideal value of about 0.4, significantly improving the spinnability and alkali corrosion resistance of the mixed raw materials. On this basis, 2.0% of ZrO 2 , 0.5% of P 2 O 5 , 1.0% of CeO 2 , 1.0% of Y 2 O 3 and other alkali corrosion-resistant oxides were added to further improve the alkali corrosion resistance of the fiber roving. Through various production parameters such as melting temperature, forming temperature, liquidus temperature, filament forming rate, and full barrel rate, it can be seen that the effect of Example 1 is good. While meeting the basalt industrial production process, compared with the comparative example, the alkali corrosion resistance (yarn breaking strength and strength retention rate after erosion) of the fiber roving has been greatly improved, and the alkali corrosion resistance of the fiber roving can reach the BASⅠ alkali corrosion resistance performance index in "Classification, Grading and Coding of Basalt Fibers" (GB / T 38111-2019). At the same time, the tensile strength and drawing modulus of the fiber roving have also increased significantly.

[0070] On the basis of Example 1, in Example 2, the percentage addition amount of the alkali corrosion-resistant oxide ZrO 2 was increased to 3.0%, the percentage addition amount of Al 2 O 3 was increased to 6.35%, and the percentage addition amount of MgO was increased to 5.2%, which can further improve the alkali corrosion resistance of the fiber roving, and the fiber roving can reach the BASⅡ alkali salt resistance performance index in "Classification, Grading and Coding of Basalt Fibers" (GB / T 38111-2019).

[0071] Example 3 On the basis of Example 2, the percentage addition of the alkali-resistant oxide ZrO 2 is increased to 4.0%, the percentage addition of Al 2 O 3 is increased to 6.70%, and the percentage addition of MgO is increased to 5.4%; On the basis of Example 3, Example 4 increases the percentage addition of the alkali-resistant oxide ZrO 2 to 5.0%, the percentage addition of Al 2 O 3 to 7.05%, and the percentage addition of MgO to 5.6%; On the basis of Example 4, Example 5 increases the percentage addition of the alkali-resistant oxide ZrO 2 to 6.0%, the percentage addition of Al 2 O 3 to 7.40%, and the percentage addition of MgO to 5.8%; These operations of gradually increasing the alkali-resistant oxide further improve the alkali corrosion resistance of the fiber preform.

[0072] Example 6 On the basis of Example 5, 1.0% of La 2 O 3 is added. As a rare earth oxide, La 2 O 3 can not only strengthen the network structure, but also increase the formation of the iron-rare earth protective film, thereby further improving the alkali corrosion resistance of the fiber preform.

[0073] Compared with the single diabase ore raw material (comparative example) in Wuyicun, Jin Kouhe District, Sichuan Province, all the examples of the present invention adjust the chemical composition of the raw material through the multi-element mixing and homogenization of the ore to improve the spinnability of the raw material; at the same time, an appropriate amount of alkali-resistant oxide is added to promote the formation of a multi-layer protective film on the fiber surface; and a trace amount of atmosphere (oxidation or reduction) regulator is introduced, so as to comprehensively improve the alkali corrosion resistance of the fiber preform. The homogenized mixture after the regulator has the following advantages:

[0074] (1) It has high alkali corrosion resistance. The alkali corrosion resistance of the fiber preform in Example 1 reaches the BASⅠ alkali-resistant salt performance index in "Classification, Grading and Coding of Basalt Fibers" (GB / T38111-2019); the alkali corrosion resistance of the fiber preforms in Examples 2-6 can all reach the BASⅡ alkali-resistant salt performance and above indexes in "Classification, Grading and Coding of Basalt Fibers" (GB / T38111-2019), filling the gap in the products of alkali-resistant basalt fiber preforms in China.

[0075] (2) It has a relatively low melting temperature, forming temperature and liquidus temperature that are suitable for industrial production. During the multi-component blending process, the reasonable combination of raw materials reduces the energy requirement of the system, while leaving room for the interaction of alkali-resistant oxides to be added. The introduction of a small amount of atmosphere adjuster helps to reduce the viscosity of the melt and improve its fluidity, enabling good melting, forming and other processes to be achieved at a relatively low temperature, which is beneficial to energy conservation and process control in industrial production.

[0076] (3) A relatively high filament formation rate and full barrel rate can ensure the economic benefits of high modulus precursor production. Multi-component blending reduces the production instability factors caused by the defects of single ore raw materials. The synergistic effect of alkali-resistant oxides and atmosphere adjusters further improves the stability of the production process, making the fibers easier to form and of more stable quality during production, thus increasing the filament formation rate and full barrel rate.

[0077] It should be noted that the description of the preferred embodiments of the present invention is given in the specification of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not additional limitations to the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as within the scope described in the specification of the present invention; further, for those of ordinary skill in the art, improvements or changes can be made according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for producing highly alkali-resistant continuous basalt fiber by multi-mixing of raw materials, characterized in that: The method comprises the following steps: (1) Raw material selection: one or more neutral igneous rocks with a SiO2 mass percentage content greater than or equal to 54% and less than 66% are selected as the main material, and one or more basic-neutral igneous rocks with a SiO2 mass percentage content greater than or equal to 52% and less than 54% are selected as the auxiliary material; (2) Raw material ratio: Determine the chemical composition content of the main ingredient and the supplementary ingredient selected in step (1) by material testing means, and determine the ratio of the main ingredient and the supplementary ingredient based on the target component content of the mixed ingredients; (3) Mixing: Mix the raw materials in proportion, crush, grind, and pass through an 80-100 mesh sieve to obtain a mixed material, and sample and test to determine whether the actual content of the mixed material is within the target content range; (4) Selection and addition of alkali-resistant oxides: Determine the type and amount of alkali-resistant oxides to be added based on the actual composition and content of the mixed materials and the expected alkali-resistant properties of the continuous basalt fiber products; (5) Selection and addition of atmosphere adjusters: Determine the type and amount of atmosphere adjusters to be added based on the ratio of FeO / (Fe2O3+FeO) in the actual content of the mixed materials; (6) mixing the selected alkali-resistant oxide and atmosphere regulator with the mixed material and performing a homogenization treatment to obtain a homogenized powder; (7) Fiber production: The homogenized powder obtained in step (6) is subjected to wire drawing to obtain continuous basalt fibers.

2. The method according to claim 1, characterized in that The neutral igneous rock includes andesite or diorite; The basic-intermediate igneous rock includes basalt, basaltic andesite, diabase, diabase andesite or pyroxene andesite.

3. The method according to claim 1, characterized in that The mass fraction of total iron in the main material is 6%-10%, and the mass fraction of total iron in the batch material is 7%-12%; Furthermore, the FeO / (Fe2O3+FeO) of the main material is 0.2-0.6, and the FeO / (Fe2O3+FeO) of the supplementary material is 0.2-0.

6.

4. The method according to claim 1, characterized in that: The mineral structures of the main material and the supplementary materials are dense or porphyritic.

5. The method according to claim 1, characterized in that The quartz mineral content of the main material and the supplementary materials is both ≤15%, the CaO content is both ≤9%, and the ignition loss is both ≤2.0%.

6. The method according to claim 1, characterized in that The target component contents of the mixed materials in step (2) are: by mass percentage, 56%-62% SiO2, 14%-20% Al2O3, 7%-11% (Fe2O3+FeO), 6%-10% MgO, 5%-8% CaO, 1.5%-3% Na2O, 2%-4% K2O, and 1.5%-5% TiO2.

7. The method according to claim 6, characterized in that The target component content of the mixed material is, by mass, FeO / (Fe2O3+FeO)=0.2-0.6; Furthermore, in the target component content of the mixed material, the mass fraction of plagioclase + pyroxene is ≥ 70%.

8. The method according to claim 1, characterized in that: The alkali corrosion resistant oxide is selected from one or more of the following: 1) enhanced network structure: SiO2, MgO, Li2O, BeO, rare earth oxide; 2) OH - Ion adsorption type: ZrO2, Al2O3, Hf2O, TiO2; 3) Fiber surface protection film type: ZrO2+TiO2, Fe2O3+Al2O3, Fe2O3+rare earth oxide, Fe2O3+CaO+hydroxide gel; 4) Network structure interweaving type: P2O5; Further, the rare earth oxides include CeO2, Y2O3, Sc2O3, and La2O3; Furthermore, the alkali corrosion-resistant oxide is added to the mixed material in the form of pure oxide; Further, the alkali corrosion resistant oxide is added to the mixed material in the form of a mineral containing the alkali corrosion resistant oxide; Further, when the ratio of FeO / (Fe2O3+FeO) in the actual content of the mixed material is greater than 0.4 and less than or equal to 0.6, an oxidizing atmosphere adjuster is added; when the ratio of FeO / (Fe2O3+FeO) in the actual content of the mixed material is equal to 0.4, no atmosphere adjuster is added; when the ratio of FeO / (Fe2O3+FeO) in the actual content of the mixed material is greater than or equal to 0.2 and less than 0.4, a reducing atmosphere adjuster is added; Furthermore, the atmosphere adjuster is selected from one or more of the following: 1) oxidizing agent: MnO2, V2O5, CeO2, NaNO3, KMnO4, KClO3, PbO2; 2) reducing agent: sodium borohydride (NaBH4), magnesium powder, citric acid, graphite, oxalic acid.

9. The method according to claim 1, characterized in that: In step (6), the particle size of the alkali corrosion resistant oxide and the atmosphere adjuster mixed with the mixed material is 80-100 mesh, preferably the same mesh grade as the mixed material; Furthermore, in step (6), the composition content of the homogenized powder is: by mass percentage, 45%-55% SiO2, 16%-20% Al2O3, 5%-11% (Fe2O3+FeO), 6%-10% MgO, 3%-8% CaO, 1%-3% Na2O, 1%-3% K2O, 1%-6% TiO2, 0%-10% ZrO2, 0%-2% Hf2O, 0%-2% Li2O, 0%-2% BeO, 0%-10% rare earth oxides, and 0%-1.5% network structure interwoven oxides.

10. A continuous basalt fiber produced by the method of any one of claims 1-9.

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