Continuous basalt fiber and method for preparing continuous basalt fiber using lithium slag

Abstract

The present application relates to the technical field of inorganic fiber, and particularly relates to continuous basalt fiber and a method for preparing the continuous basalt fiber by using lithium residue. The continuous basalt fiber is prepared by taking the solid waste lithium residue in the lithium extraction by sulfuric acid method as raw material, and the lithium residue is desulfurized by flotation or washing to obtain desulfurized modified lithium residue; the raw material is mixed according to the corresponding weight fraction to obtain a mixture; the mixture is ground, sieved and dried to obtain a grinding material; the grinding material is melted, and the melt is drawn through a platinum-rhodium alloy bushing to obtain the continuous basalt fiber. The continuous basalt fiber is prepared based on the lithium residue, has a low melting temperature, good alkali resistance and thermal stability, and realizes the purpose of recycling the solid waste lithium residue in the lithium extraction by sulfuric acid method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inorganic fiber, in particular to continuous basalt fiber and a method for preparing continuous basalt fiber by using lithium slag. BACKGROUND

[0002] Continuous basalt fiber material is an environmentally friendly inorganic fiber material, which has the advantages of light weight, high strength, high temperature resistance, corrosion resistance, oxidation resistance, heat and sound insulation, and is widely used in aerospace, automobile and ship, civil engineering and transportation, energy and environment, chemical industry and fire fighting, national defense and military industry, etc. In particular, in the field of building, as a new building reinforcing material for replacing part of the steel bars, it has good compatibility with cement and concrete, and can effectively enhance the strength and crack resistance of cement-based materials.

[0003] Currently, the raw material for preparing basalt fiber is mainly natural basalt, and there is little research on the raw material for preparing basalt fiber. The natural basalt used to prepare basalt fiber mainly contains 45-55wt%SiO2, 12-18wt%Al2O3, 4.5-14wt%Fe2O3+FeO, 5-12wt%CaO, 3-5wt%MgO, 0.9-2.0wt%TiO2, and 2.0-3.5wt%other.

[0004] In the prior art, CN109879598A limits the use of basalt ore as the main raw material, i.e. the yield of basalt fiber depends on the basalt reserves in the mine, which increases the production cost and makes it difficult to ensure the continuity of production. At the same time, the alkali resistance of the prepared basalt fiber is not ideal, and the reported data is that after being soaked in 2mol / L NaOH solution at 60℃ for 24h, the residual weight of the fiber is 79-89%, which is relatively low.

[0005] CN113121120A provides a method for preparing high-alkali-resistant basalt fiber, which adds Co2O3 and ZrO2 together with basalt to produce a dense film to protect the basalt fiber and improve its alkali resistance. The reported data is that after being soaked in 2mol / L NaOH solution at 60℃±1℃ for 24h, the mass loss rate is 3-11%, which is slightly reduced, but the cost of Co2O3 and ZrO2 is high, and the raw material cost needs to be considered while ensuring the alkali resistance.

[0006] CN109626833A discloses a method for preparing continuous basalt fiber from blast furnace slag, which comprises the following steps: uniformly mixing blast furnace slag, coal gangue, fly ash, quartz sand, zirconia, cerium oxide and titanium tailings, and then taking the mixture as raw material for producing basalt fiber, melting at a temperature of 1400-1600 DEG C for 3-5 hours, and then drawing to obtain continuous basalt fiber. Although this patent realizes the comprehensive utilization of industrial solid waste, the melting temperature is high, which increases the manufacturing cost.

[0007] With the vigorous development of new energy industry, the demand for lithium batteries has increased rapidly, and the lithium-related industry has also developed rapidly. As a key raw material for the development of new energy, the acquisition of lithium has always attracted widespread attention. Lithium mainly comes from lithium-containing salt lakes and lithium ores. Compared with lithium extraction from lithium-containing salt lakes, lithium extraction from lithium ores by sulfuric acid roasting method is still the most important way to extract lithium due to its mature process flow and short production cycle. However, the production of 1t of lithium carbonate product will produce 8-10t of tailings, and the utilization rate of the tailings is low, causing great waste of resources and environmental pollution, not meeting the requirements of green and environmental protection, and the sulfuric acid method for extracting lithium causes a large amount of tailings accumulation. In order to solve the resource waste and environmental hazards caused by lithium residue stacking, it is of theoretical and practical significance to explore the resource utilization technology of lithium spodumene flotation tailings. The main components of lithium residue are SiO2, Al2O3, SO3, CaO, Fe2O3, etc., which are similar to the main components of basalt. Therefore, using lithium residue as raw material to prepare continuous basalt fiber can realize the resource utilization of lithium residue. SUMMARY

[0008] In order to overcome the above technical defects, the continuous basalt fiber and the method for preparing the continuous basalt fiber by using lithium residue of the present application are prepared based on lithium residue, the melting temperature is low, and the continuous basalt fiber has good alkali resistance and thermal stability, and at the same time realizes the resource utilization of lithium residue.

[0009] The continuous basalt fiber comprises the following preparation raw materials in parts by weight:

[0010] Desulfurized modified lithium residue 40-60 parts;

[0011] Titanium tailings 18-25 parts;

[0012] Dolomite 10-15 parts;

[0013] Fly ash 3-8 parts;

[0014] Kaolinite tailings 3-8 parts;

[0015] Quartz sand 1-5 parts;

[0016] Zircon 1-3 parts.

[0017] In one embodiment of the present application, the desulfurized modified lithium slag is prepared by flotation desulfurization or washing desulfurization of the sulfur-containing lithium slag.

[0018] In one embodiment of the present application, the desulfurized modified lithium slag contains the following components in percentage by weight: SiO2 62-68%, Al2O3 21-25%, Fe2O3 1.0-2.0%, SO3 0.2-0.5%, CaO 0.5-1.0%, Na2O and K2O 0.5-1.0%, MgO and MnO 0.2-0.5%, Li2O 0.2-0.5%.

[0019] In one embodiment of the present application, the titanium tailings contain the following components in percentage by weight: SiO2 42-48%, Al2O3 7-12%, Fe2O3 10-16%, TiO2 3.5-7%, CaO 12-16%, MgO 10.0-15%, Na2O and K2O 1.0-1.5%.

[0020] In one embodiment of the present application, the dolomite contains the following components in percentage by weight: CaO 24-28%, MgO 12-15%, Fe2O3 8-10%, SiO2 0.5-1.0%, Al2O3 0.2-0.4%, Na2O and K2O 0.1-0.3%.

[0021] In one embodiment of the present application, the fly ash contains the following components in percentage by weight: SiO2 48-55%, Al2O3 22-28%, Fe2O3 3-5%, CaO 4-7%, Na2O and K2O 2-4%.

[0022] In one embodiment of the present application, the kaolinite tailings contain the following components in percentage by weight: SiO2 36-44%, Al2O3 32-38%, Fe2O3 2-5%, TiO2 3-5%, CaO 1-2%, MgO 0.5-1%, Na2O and K2O 1.0-2%.

[0023] In one embodiment of the present application, the quartz sand contains the following components in percentage by weight: SiO2 95-100%, Al2O3 0.5-1.0%, Fe2O3 0.2-0.5%, Na2O and K2O 0.2-0.5%.

[0024] In one embodiment of the present application, the zircon contains the following components in percentage by weight: ZrO2 62-67%, SiO2 28-32%.

[0025] The method for preparing the continuous basalt fiber by using lithium slag comprises the following steps:

[0026] a. The lithium slag is desulfurized by flotation or washing to obtain desulfurized modified lithium slag; the desulfurized modified lithium slag, titanium tailings, dolomite, fly ash, kaolinite tailings, quartz sand and zircon are mixed according to corresponding weight fractions to obtain a mixture;

[0027] b. The mixture is ground, and the ground mixture is sieved and dried to obtain a grinding material;

[0028] c. The grinding material is melted, and the melt is drawn through a platinum-rhodium alloy bushing to prepare the continuous basalt fiber.

[0029] In one specific embodiment of the present application, step b grinding, the sieving uses a 100-mesh sieve.

[0030] In one specific embodiment of the present application, step b grinding, the grinding mill is at least one of a ball mill, a tower mill, a vertical mill and a rod mill.

[0031] In one specific embodiment of the present application, step b grinding, the drying is spray drying, and the temperature of the spray drying is 250-300 DEG C.

[0032] In one specific embodiment of the present application, step c melting and bushing drawing, the temperature of the melting is 1200-1400 DEG C, and the time is 2-4 h.

[0033] In one specific embodiment of the present application, step c melting and bushing drawing, the temperature of the drawing is 1150-1350 DEG C.

[0034] The beneficial effects of the present application are: 1. The present application uses desulfurized modified lithium slag as raw material, and adds titanium tailings, dolomite, fly ash, kaolinite tailings, quartz sand and zirconite, and the content of each component is reasonably matched, which synergistically improves the performance of continuous basalt fiber, and realizes efficient utilization of lithium slag in the lithium extraction process by sulfuric acid method; 2. In the continuous basalt fiber of the present application, the desulfurized modified lithium slag removes sulfur, which improves the influence of sulfur on the continuous basalt fiber; 3. In the continuous basalt fiber of the present application, the low content of Li2O in the desulfurized modified lithium slag is directly introduced, and ZrO2 is introduced by zirconite, which synergistically improves the alkali corrosion resistance of basalt fiber, and reduces the melting temperature and drawing temperature of basalt fiber, thereby reducing the production cost of basalt fiber; 4. The continuous basalt fiber of the present application uses kaolinite tailings to improve the mechanical properties of continuous basalt fiber; 5. The continuous basalt fiber prepared by the preparation method of the present application has high alkali corrosion resistance and mechanical properties, and also has high drawing stability, high yield of continuous basalt fiber, simple raw material source, and is conducive to large-scale application of continuous basalt fiber. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] The continuous basalt fiber of the present application comprises the following preparation raw materials in parts by weight: desulfurized modified lithium slag 40-60 parts; titanium tailings 18-25 parts; dolomite 10-15 parts; fly ash 3-8 parts; kaolinite tailings 3-8 parts; quartz sand 1-5 parts; zirconite 1-3 parts.

[0037] In some examples, the desulfurized modified lithium slag is prepared by flotation desulfurization or washing desulfurization of sulfur-containing lithium slag.

[0038] In some examples, the sulfur-containing lithium slag contains the following components in percentage by weight: SiO2 52-62%, Al2O3 18-23%, Fe2O3 1.0-1.5%, SO3 5-8%, CaO 3-6%, Na2O and K2O 0.5-1.0%, MgO and MnO 0.2-0.5%, Li2O 0.2-0.5%

[0039] In some examples, the desulfurized modified lithium slag contains the following ingredients in weight percentage: SiO2 62-68%, Al2O3 21-25%, Fe2O3 1.0-2.0%, SO3 0.2-0.5%, CaO 0.5-1.0%, Na2O and K2O 0.5-1.0%, MgO and MnO 0.2-0.5%, Li2O 0.2-0.5%.

[0040] In some examples, the titanium-selected tailings contain the following ingredients in weight percentage: SiO2 42-48%, Al2O3 7-12%, Fe2O3 10-16%, TiO2 3.5-7%, CaO 12-16%, MgO 10.0-15%, Na2O and K2O 1.0-1.5%.

[0041] In some examples, the dolomite contains the following ingredients in weight percentage: CaO 24-28%, MgO 12-15%, Fe2O3 8-10%, SiO2 0.5-1.0%, Al2O3 0.2-0.4%, Na2O and K2O 0.1-0.3%.

[0042] In some examples, the fly ash contains the following ingredients in weight percentage: SiO2 48-55%, Al2O3 22-28%, Fe2O3 3-5%, CaO 4-7%, Na2O and K2O 2-4%.

[0043] In some examples, the kaolinite tailings contain the following ingredients in weight percentage: SiO2 36-44%, Al2O3 32-38%, Fe2O3 2-5%, TiO2 3-5%, CaO 1-2%, MgO 0.5-1%, Na2O and K2O 1.0-2%.

[0044] In some examples, the quartz sand contains the following ingredients in weight percentage: SiO2 95-100%, Al2O3 0.5-1.0%, Fe2O3 0.2-0.5%, Na2O and K2O 0.2-0.5%.

[0045] In some examples, the zircon contains the following ingredients in weight percentage: ZrO2 62-67%, SiO2 28-32%.

[0046] The method for preparing the continuous basalt fiber described above from lithium slag comprises the following steps:

[0047] a. batching: desulfurizing the lithium slag by flotation or washing to obtain a desulfurized modified lithium slag; taking the desulfurized modified lithium slag, titanium-selected tailings, dolomite, fly ash, kaolinite tailings, quartz sand and zircon in corresponding weight fractions to obtain a mixture;

[0048] b. milling: the mixture is subjected to a milling process, and after sieving and drying, a mill base is obtained;

[0049] c. melt and bushing drawing: the mill base is melted, and the melt is drawn through a platinum-rhodium alloy bushing to produce continuous basalt fibers.

[0050] In some examples, step b. milling, the sieving uses a 100 mesh sieve.

[0051] In some examples, step b. milling, the mill used for the milling is at least one of a ball mill, a tower mill, a vertical mill, and a rod mill.

[0052] In some examples, step b. milling, the drying is spray drying; the spray drying is at a temperature of 250-300°C.

[0053] In some examples, step c. melt and bushing drawing, the melting is at a temperature of 1200-1400°C for 2-4 hours.

[0054] In some examples, step c. melt and bushing drawing, the drawing is at a temperature of 1150-1350°C.

[0055] The sources and compositions of the raw materials used in the following examples and comparative examples are as follows:

[0056] Sulfur-containing lithium slag: obtained from a lithium chemical plant in Suining, Sichuan Province, and containing the following chemical components by weight percentage: SiO2 57%, Al2O3 22%, Fe2O3 1.2%, SO3 6.3%, CaO 5.0%, Na2O and K2O 0.8%, MgO and MnO 0.3%, Li2O 0.4%.

[0057] Titanium tailings: obtained from an ore dressing plant in Panzhihua, Sichuan Province, and containing the following components by weight percentage: SiO2 45%, Al2O3 9.7%, Fe2O3 13%, TiO2 5.6%, CaO 14%, MgO 12%, Na2O and K2O 1.5%.

[0058] Dolomite: obtained from an ore dressing plant in Baiyunebo mining area, and containing the following components by weight percentage: CaO 26%, MgO 14%, Fe2O3 9.6%, SiO2 0.8%, Al2O3 0.2%, Na2O and K2O 0.2%.

[0059] Fly ash: obtained from a power plant in Mianyang, Sichuan Province, and containing the following components by weight percentage: SiO2 52%, Al2O3 24%, Fe2O3 4.5%, CaO 6.3%, Na2O and K2O 3.2%.

[0060] Kaolinite tailings: taken from a coal preparation plant in Yibin City, Sichuan Province, containing the following components by weight percentage: SiO2 40%, Al2O3 35%, Fe2O3 3.2%, TiO2 3.8%, CaO 1.4%, MgO 0.7%, Na2O and K2O 1.6%.

[0061] Quartz sand: taken from a beneficiation plant in Guangyuan City, Sichuan Province, contains the following components by weight percentage: SiO2 98%, Al2O3 0.6%, Fe2O3 0.3%, Na2O and K2O 0.4%.

[0062] Zircon: Taken from a beneficiation plant in Jiangxi Province, it contains the following components by weight percentage: ZrO2 65%, SiO2 30%.

[0063] Example 1

[0064] The method for preparing continuous basalt fibers in this embodiment includes:

[0065] 1. Sulfur-containing lithium slag is subjected to flotation desulfurization treatment to obtain desulfurized modified lithium slag. The desulfurized modified lithium slag contains the following chemical composition by weight percentage: SiO2 66%, Al2O3 24%, Fe2O3 1.3%, SO3 0.3%, CaO 0.6%, Na2O+K2O 0.9%, MgO+MnO 0.3%, Li2O 0.5%.

[0066] 2. Weigh and mix the raw materials according to the weight percentage composition ratio of the raw materials in Table 1 to obtain the batch.

[0067] Table 1

[0068] Component Content (%) Component Content (%) Desulfurization modified lithium slag Titanium tailings Dolomite 50 Fly ash 22 Kaolin tailings 12 Quartz sand 6 Zircon 5 Component Content (%) 3 Component Content (%) 2 -- --

[0069] 3. Grind the batch materials using a ball mill until the ground material completely passes through a 100-mesh square hole sieve. The sieved material is then spray-dried at 250°C to obtain the dried material.

[0070] 4. Pour the dried material into the furnace and melt it at 1300℃ for 3 hours to form a uniform melt.

[0071] 5. The temperature of the melt is reduced to 1250℃, and the melt is drawn into continuous basalt fibers through a platinum-rhodium alloy spinneret.

[0072] Example 2

[0073] The method for preparing continuous basalt fibers in this embodiment includes:

[0074] 1. The sulfur-containing lithium slag is subjected to flotation desulfurization treatment to obtain desulfurized modified lithium slag; the desulfurized modified lithium slag contains the following chemical components in percentage by weight: SiO2 66%, Al2O3 24%, Fe2O3 1.3%, SO3 0.3%, CaO 0.6%, Na2O and K2O 0.9%, MgO and MnO 0.3%, and Li2O 0.5%.

[0075] 2. The raw materials are weighed and mixed according to the percentage by weight of the raw materials in Table 2 to obtain a mixture.

[0076] Table 2

[0077] Desulfurization modified lithium slag Titanium tailings Dolomite Fly ash Kaolin tailings 55 Quartz sand 23 Zircon 11 Component Content (%) 4 Component Content (%) 4 Desulfurization modified lithium slag 2 Titanium tailings 1 -- --

[0078] 3. The mixture is ground by a ball mill so that the ground material completely passes through a 100-mesh square hole screen, and the screened material is subjected to spray drying at 300°C to obtain dried material.

[0079] 4. The dried material is poured into a melting furnace and melted at 1400°C for 2h to form a uniform molten body.

[0080] 5. The temperature of the molten body is reduced to 1300°C, and the continuous basalt fiber is prepared by drawing through a platinum-rhodium alloy bushing.

[0081] Example 3

[0082] The method for preparing the continuous basalt fiber of the present embodiment comprises:

[0083] 1. The sulfur-containing lithium slag is subjected to washing desulfurization treatment to obtain desulfurized modified lithium slag; the desulfurized modified lithium slag contains the following chemical components in percentage by weight: SiO2 65%, Al2O3 23%, Fe2O3 1.3%, SO3 0.5%, CaO 0.7%, Na2O and K2O 0.9%, MgO and MnO 0.3%, and Li2O 0.4%.

[0084] 2. The raw materials are weighed and mixed according to the percentage by weight of the raw materials in Table 3 to obtain a mixture.

[0085] Table 3

[0086] Dolomite Fly ash Kaolin tailings Quartz sand Zircon 45 Component Content (%) 25 Component Content (%) 14 Desulfurization modified lithium slag 6 Titanium tailings 6 Dolomite 1 Fly ash 3 -- --

[0087] 3. The mixture is ground by a ball mill so that the ground material completely passes through a 100-mesh square hole screen, and the screened material is subjected to spray drying at 300°C to obtain dried material.

[0088] 4. The dried material is poured into a melting furnace and melted at 1200°C for 4h to form a uniform molten body.

[0089] 5. The temperature of the molten body is reduced to 1150°C, and the continuous basalt fiber is prepared by drawing through a platinum-rhodium alloy bushing.

[0090] Example 4

[0091] The method for preparing the continuous basalt fiber of the present example comprises:

[0092] 1. The sulfur-containing lithium slag is washed and desulfurized to obtain a desulfurized modified lithium slag. The desulfurized modified lithium slag contains the following chemical components by weight percentage: SiO2 65%, Al2O3 23%, Fe2O3 1.3%, SO3 0.5%, CaO 0.7%, Na2O and K2O 0.9%, MgO and MnO 0.3%, and Li2O 0.4%.

[0093] 2. The raw materials are weighed and mixed according to the weight percentage composition of Table 4 to obtain a batch.

[0094] Table 4

[0095] Kaolin tailings Quartz sand Zircon ​ ​ 50 ​ 22 ​ 14 ​ 6 ​ 6 ​ 1 ​ 1 -- --

[0096] 3. The batch is ground by a ball mill so that the ground material completely passes through a 100-mesh square hole sieve. The sieved material is spray dried at 300°C to obtain a dried material.

[0097] 4. The dried material is poured into a melting furnace and melted at 1400°C for 3h to form a uniform molten body.

[0098] 5. The temperature of the molten body is reduced to 1300°C, and the continuous basalt fiber is prepared by drawing through a platinum-rhodium alloy bushing.

[0099] Comparative Example 1

[0100] The difference between the present comparative example and Example 1 is that the sulfur-containing lithium slag is used instead of the desulfurized modified lithium slag in Example 1.

[0101] Comparative Example 2

[0102] The difference between the present comparative example and Example 1 is that the titanium tailings are used instead of the kaolin tailings in Example 1.

[0103] Performance detection of the continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2:

[0104] 1. Detection method

[0105] The fiber diameter of the continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2 is observed and measured by a scanning electron microscope (UItra 55).

[0106] Combustible content: The combustible content of continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2 was determined according to GB / T 41065-2021 "Determination of combustible content of basalt fibers" by muffle furnace burning test.

[0107] Mass loss rate: 10 g of continuous basalt fibers was weighed and placed in a drying oven at 105°C for 1 h, then taken out and cooled to room temperature in a desiccator, and weighed as m1; the continuous basalt fiber sample was placed in a beaker containing 250 mL of 2 mol / L sodium hydroxide solution, covered with a glass surface dish; the beaker was placed in a constant temperature water bath controlled at 60°C±1°C, and taken out after 24 h; the fiber was washed several times with deionized water until the solution was neutral, then the fiber was immersed in deionized water for 3 h and rinsed 3 times with deionized water; the sample was placed in a drying oven at a temperature of 105°C for drying for 120 min, and the fiber mass m2 was measured after cooling in the desiccator; the mass loss rate of continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2 was determined according to (m1-m2) / m1×100%.

[0108] Tensile strength and breaking strength: The tensile strength and breaking strength of continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2 were detected by YG-004 type electronic single fiber strength machine.

[0109] Strength retention rate: A 10 m continuous basalt fiber sample was wound and placed in a beaker containing 500 mL of 1 mol / L sodium hydroxide solution, covered with a glass surface dish, and the beaker was placed in a constant temperature water bath controlled at 60°C, and taken out after 120 min±5 min; the fiber was washed several times with deionized water until the solution was neutral, and then the fiber sample was placed in a drying oven at a temperature of 105°C for drying for 180 min, and cooled in the desiccator; the breaking strength of the alkali treated yarn was measured by YG-004 type electronic single fiber strength machine, and the strength retention rate was calculated according to the breaking strength before and after alkali treatment.

[0110] 2. Test results

[0111] The fiber diameter, combustible content, mass loss rate, tensile strength, breaking strength and strength retention rate of continuous basalt fibers of Examples 1-4 and Comparative Examples 1-2 were statistically analyzed as shown in Table 5.

[0112] Table 5

[0113]

[0114] As shown in Table 5, the mass loss rate of Examples 1-4 is less than that of Comparative Example 1, the tensile strength, the breaking strength after alkali and the breaking strength retention rate of Examples 1-4 are all greater than those of Comparative Example 1, and the combustible content of Examples 1-4 has little change compared with that of Comparative Example 1, which indicates that the sulfur element affects the mechanical properties of the continuous basalt fiber, and the introduced sulfur element cannot be combusted and volatilized under high temperature conditions, but the presence of the sulfur element reduces the alkali resistance of the continuous basalt fiber; the sulfur-containing lithium slag produced based on the sulfuric acid method for extracting lithium cannot be directly applied to the preparation of the continuous basalt fiber;

[0115] Compared with Comparative Example 2, the mass loss rate of Examples 1-4 is less than that of Comparative Example 2, and the tensile strength, the breaking strength and the strength retention rate of Examples 1-4 are all higher than those of Comparative Example 2, which indicates that the kaolin tailings can enhance the mechanical properties of the continuous basalt fiber;

[0116] After the continuous basalt fibers of Examples 1-4 are corroded by an alkali solution, the breaking strength retention rate is all greater than 70%, which indicates that the continuous basalt fiber of the present application has good alkali corrosion resistance.

Claims

1. Continuous basalt fiber, characterized in that, The preparation materials include the following parts by weight: 40-60 parts of desulfurized modified lithium slag; Select 18-25 parts of titanium tailings; 10-15 parts of dolomite; 3-8 parts fly ash; 3-8 portions of kaolinite tailings; 1-5 parts of quartz sand; 1-3 parts zircon; The desulfurized modified lithium slag contains the following components by weight percentage: 62-68% SiO2, 21-25% Al2O3, 1.0-2.0% Fe2O3, 0.2-0.5% SO3, 0.5-1.0% CaO, 0.5-1.0% Na2O and K2O, 0.2-0.5% MgO and MnO, and 0.2-0.5% Li2O.

2. The continuous basalt fiber according to claim 1, characterized in that: The desulfurized modified lithium slag is prepared by flotation desulfurization or washing desulfurization of sulfur-containing lithium slag.

3. The continuous basalt fiber according to claim 1, characterized in that: The titanium tailings contain the following components by weight percentage: 42-48% SiO2, 7-12% Al2O3, 10-16% Fe2O3, 3.5-7% TiO2, 12-16% CaO, 10.0-15% MgO, 1.0-1.5% Na2O and K2O.

4. The continuous basalt fiber according to claim 1, characterized in that: The dolomite contains the following components by weight percentage: 24-28% CaO, 12-15% MgO, 8-10% Fe2O3, 0.5-1.0% SiO2, 0.2-0.4% Al2O3, 0.1-0.3% Na2O and K2O.

5. The continuous basalt fiber according to claim 1, characterized in that: The fly ash contains the following components by weight percentage: 48-55% SiO2, 22-28% Al2O3, 3-5% Fe2O3, 4-7% CaO, 2-4% Na2O and K2O.

6. The continuous basalt fiber according to claim 1, characterized in that: The kaolinite tailings contain the following components by weight percentage: 36-44% SiO2, 32-38% Al2O3, 2-5% Fe2O3, 3-5% TiO2%, 1-2% CaO, 0.5-1% MgO, 1.0-2% Na2O and K2O.

7. The continuous basalt fiber according to claim 1, characterized in that: The quartz sand contains the following components by weight percentage: 95-98% SiO2, 0.5-1.0% Al2O3, 0.2-0.5% Fe2O3, 0.2-0.5% Na2O and K2O.

8. The continuous basalt fiber according to claim 1, characterized in that: The zircon contains the following components by weight percentage: 62-67% ZrO2, 28-32% SiO2.

9. A method for preparing continuous basalt fibers according to any one of claims 1-8 using lithium slag, characterized in that, Includes the following steps: a. Ingredients: Desulfurize lithium slag by flotation or washing to obtain desulfurized modified lithium slag; According to the corresponding weight proportions, desulfurized modified lithium slag, titanium tailings, muscovite, fly ash, kaolinite tailings, quartz sand and zircon are mixed to obtain a mixture. b. Grinding: The mixture is ground, sieved, and dried to obtain abrasive. c. Molten die drawing: The abrasive is melted, and the resulting melt is drawn through a platinum-rhodium alloy die to produce continuous basalt fibers.

10. The continuous basalt fiber according to claim 9, characterized in that: In step b, grinding is performed, and the sieving is done using a 100-mesh sieve.

11. The continuous basalt fiber according to claim 9, characterized in that: Step b involves grinding the powder, wherein the grinding mill is at least one of a ball mill, a tower mill, a vertical mill, or a rod mill.

12. The continuous basalt fiber according to claim 9, characterized in that: Step b involves grinding the powder, and the drying process is spray drying; the spray drying temperature is 250–300°C.

13. The continuous basalt fiber according to claim 9, characterized in that: Step c involves drawing the molten metal through a spindle, wherein the melting temperature is 1200–1400°C and the melting time is 2–4 hours.

14. The continuous basalt fiber according to claim 9, characterized in that: Step c involves drawing the molten metal through a spinneret, with the drawing temperature ranging from 1150 to 1350°C.

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