CN110055678B - High-temperature-resistant low-biological-durability composite fiber felt and preparation process thereof - Google Patents

High-temperature-resistant low-biological-durability composite fiber felt and preparation process thereof Download PDF

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CN110055678B
CN110055678B CN201910221903.5A CN201910221903A CN110055678B CN 110055678 B CN110055678 B CN 110055678B CN 201910221903 A CN201910221903 A CN 201910221903A CN 110055678 B CN110055678 B CN 110055678B
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silica
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CN110055678A (en
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廖文俊
李曼兰
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Jiaxing Saimantak New Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/04—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Fibers (AREA)

Abstract

The invention provides a high-temperature-resistant low-biological-durability composite fiber felt and a preparation process thereof, belonging to the technical field of automobile exhaust treatment. The technical problem that the existing heat insulation material cannot guarantee the ternary catalysis at the optimal reaction temperature and the like is solved. The high-temperature-resistant low-biological-persistence composite fiber felt comprises high-silica fibers and magnesium-calcium fibers, wherein the high-silica fibers and the magnesium-calcium fibers are interwoven in a ratio of 1:1, the diameter of the high-silica fibers is 1-3 mu m, the length of the high-silica fibers is 95-105 mm, the diameter of the magnesium-calcium fibers is 3-4 mu m, and the length of the magnesium-calcium fibers is 15-20 mm. The preparation process of the high-temperature-resistant low-biological-persistence composite fiber felt comprises the steps of a, preparing raw materials; b. calcining; c. throwing silk; d. composite fibers; e. and (6) knitting. The prepared composite fiber felt has the advantage of good heat insulation effect at high temperature.

Description

High-temperature-resistant low-biological-durability composite fiber felt and preparation process thereof
Technical Field
The invention belongs to the technical field of automobile exhaust treatment, relates to a high-temperature-resistant low-biological-persistence composite fiber felt, and further relates to a preparation process of the high-temperature-resistant low-biological-persistence composite fiber felt.
Background
Automobiles have been entering people's daily lives for hundreds of years as a means of movement in human activities. The fuel oil automobile mainly takes diesel oil, gasoline or biological fuel oil as main material, and the emission limit standard of automobile exhaust is more and more strict with the increasing strictness of the environmental protection requirement. Therefore, the working efficiency of the three-way catalysis and GPF/DPF of the exhaust system of the automobile must be improved, and the three-way catalysis reaction efficiency and the particle combustion efficiency in the GPF/DPF can be obviously improved in a high-temperature environment. Finally, the toxic and harmful components in the tail gas are reduced to the minimum.
How to guarantee the ternary catalysis of the exhaust system of the car and the work efficiency of GPF/DPF, obviously promote the ternary catalysis reaction efficiency, raise the granule combustion efficiency in GPF/DPF in the high temperature environment. Finally, the toxic and harmful components in the tail gas are reduced to the minimum. The heat insulation material can keep the heat in the exhaust gas in the device as much as possible, ensures that the device works in a certain high-temperature environment and plays a very important role.
The existing heat insulation and preservation materials attached to the outside of a three-way catalytic and GPF/DPF device generally adopt the following scheme: 1. the glass fiber mat is adopted, the exhaust temperature loss is prevented by utilizing the heat insulation performance of the glass fiber mat, but the service temperature limit of the glass fiber mat is 550 ℃, and along with the continuous improvement of the performance of an automobile engine, the glass fiber mat is particularly and more popular in the prior turbocharged engine. The exhaust temperature of a gasoline turbocharged engine is as high as 820 to 850 degrees, and the exhaust temperature of a diesel engine is about 750 degrees. The glass fiber mat far exceeds the limit service temperature of the glass fiber mat, the glass fiber is used at the excess temperature, the fiber structure is damaged, and almost no heat insulation performance exists.
2. The ceramic fiber felt is adopted to prevent exhaust temperature loss by utilizing the heat insulation performance, but the ceramic fiber is listed as carcinogen by European Union regulations, is forbidden to be used, is strictly limited in human daily necessities particularly, and is not limited by the regulations in China at present. But the automobile as a special commodity has globalization attribute, and is a basic requirement for environmental protection and harmlessness to human bodies. In addition, in the production process of the ceramic fiber felt, more than 45 percent of mineral slag ball particles with the particle size of more than 212 microns are inevitably scattered in the organizational structure of the fiber felt during fiber forming. In the vibration environment of the automobile, the excessive shot particles can form accumulation, so that the fiber felt is not uniformly distributed in all directions, and the heat preservation effect is greatly reduced.
3. The high silica fiber is adopted, the heat insulation performance is utilized, the exhaust temperature loss is prevented, but the high silica fiber has the silica content of more than 95 percent, and the raw material source of more than 95 percent is Europe, so the high silica fiber is expensive.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant low-biological-durability composite fiber felt aiming at the problems in the prior art, and the technical problem to be solved is to realize high-temperature heat insulation.
The purpose of the invention can be realized by the following technical scheme:
the high-temperature-resistant low-biological-persistence composite fiber felt is characterized by comprising high-silica fibers and magnesium-calcium fibers, wherein the high-silica fibers and the magnesium-calcium fibers are interwoven in a ratio of 1:1, the diameter of the high-silica fibers is 1-3 mu m, the length of the high-silica fibers is 95-105 mm, the diameter of the magnesium-calcium fibers is 3-4 mu m, and the length of the magnesium-calcium fibers is 15-20 mm.
The use temperature of the composite fiber felt can be increased by adopting high silica fibers and magnesium-calcium fibers, the heat insulation effect is good at high temperature, and the composite fiber felt has low biological persistence and is more environment-friendly; meanwhile, the production cost can be greatly reduced, and the price is 30 to 40 percent lower than that of the high silica fiber in the same market (the use temperature reaches 800-.
The invention also provides a preparation process of the high-temperature-resistant low-biological-persistence composite fibrofelt, and the technical problem to be solved by the invention is to realize the preparation of the high-temperature-resistant low-biological-persistence composite fibrofelt.
The other purpose of the invention can be realized by the following technical scheme:
the preparation process of the high-temperature-resistant low-biological-durability composite fiber felt is characterized by comprising the following steps of:
a. preparing raw materials: respectively grinding the magnesia, the limestone and the quartz sand into fine powder of 1-3 mm by ball milling equipment, and then mixing the magnesia, the limestone and the quartz sand which are ground into fine powder according to the weight ratio of 1-1.2: 1-1.2: 2-2.4, feeding the mixture into a stirring device, and fully stirring and mixing to obtain a fine powder raw material;
b. and (3) calcining: conveying the fine powder raw material to an electric melting furnace, wherein the working temperature of the electric melting furnace is 1900-2100 ℃, and melting the fine powder raw material to form raw material slurry;
c. throwing: conveying the raw material slurry to a high-speed roller, wherein the diameter of the high-speed roller is 100mm, the rotating speed of the high-speed roller is 20000 to 22000 r/min, the raw material slurry is thrown out and cooled after contacting the high-speed roller to form magnesium-calcium fibers, the diameter of the formed magnesium-calcium fibers is 3 to 4 mu m, the length of the magnesium-calcium fibers is about 15 to 20mm, and the formed magnesium-calcium fibers are sucked into a cotton collecting bin through negative pressure;
d. composite fiber: the cotton collection bin sucks high silica fibers at negative pressure, the diameter of the sucked high silica fibers is 1-3 mu m, the length of the sucked high silica fibers is 95-105 mm, meanwhile, silica sol atomized at high pressure is sent into the cotton collection bin, and the high silica fibers and the magnesium-calcium fibers in the cotton collection bin are compounded to form composite fibers under the action of the atomized silica sol through airflow formed at negative pressure;
e. knitting: and (3) conveying the composite fiber to needling equipment, repeatedly needling the mixed fiber by using a barbed needle in the needling equipment to interweave the high silica fiber and the magnesium-calcium fiber in the composite fiber, and finally obtaining a finished product.
The magnesium-calcium fibers with the diameters of 3-4 microns and the lengths of 15-20 mm are prepared through the steps a, b and c, the magnesium-calcium fibers and the existing high silica fibers are compounded through silica sol under the action of air flow in a cotton collecting bin, at the moment, the interweaving degree of the magnesium-calcium fibers and the high silica fibers is low, and finally, the high silica fibers and the magnesium-calcium fibers are further interwoven through needles with barbs in needling equipment, so that the interweaving of the high silica fibers and the magnesium-calcium fibers is more and more compact; the needling equipment can adopt a needling machine with the model number of N-354 made by ANDRITZ, and the finished high-temperature resistant low-biological durability composite fiber felt can be obtained by knitting for about 2 to 3 minutes in the needling machine.
The magnesium-calcium fiber is manufactured by adopting a high-rotating-speed spinning fiber forming process, so that the content of the silicon-calcium-magnesium fiber slag balls can be effectively reduced; the two high silica fibers are added under negative pressure, the surface collecting time is prolonged, the two high silica fibers and the magnesium-calcium fiber are mixed at a low speed, so that the high silica fibers and the magnesium-calcium fiber are uniformly compounded, and the strength of the composite fiber felt can be enhanced through knitting.
In the preparation process of the high-temperature-resistant low-biological-persistence composite fibrofelt, in the step b and the step c, the electric melting furnace is arranged right above the high-speed rollers, the bottom of the furnace body of the electric melting furnace is provided with a spout, the diameter of the spout is 9-11 mm, and raw material slurry in the furnace body of the electric melting furnace flows onto the high-speed rollers through the spout. The raw material slurry flows to the high-speed roller through the flow port by gravity, the flow of the raw material slurry can be controlled by the diameter of the flow port, and the uniform size of the magnesium-calcium fibers formed by throwing the fibers by the high-speed roller is ensured.
In the preparation process of the high-temperature-resistant low-biological-durability composite fiber felt, in the step b, the fine powder raw material is conveyed to an electric melting furnace through a conveying belt at the conveying speed of 50 kg/min.
In the preparation process of the high-temperature-resistant low-biological-persistence composite fiber felt, in the step b, the electric melting furnace is heated by adopting three silicon-molybdenum rod electrodes with the diameter of 200 millimeters.
In the preparation process of the high-temperature-resistant low-biological-durability composite fibrofelt, the high-speed roller is a titanium alloy roller. The titanium alloy roller can keep the shape at high temperature, and the size of the formed magnesium-calcium fiber is ensured to be uniform.
In the preparation process of the high-temperature-resistant low-biological-persistence composite fiber felt, in the step d, the high silica fiber is sucked into the cotton collection bin through the negative pressure of 20-23KPA, the air flow of 5-8 m/s is formed in the cotton collection bin through the negative pressure of 20KPA, and the compounding of the high silica fiber and the magnesium-calcium fiber is realized through the air flow. The airflow at the speed can realize the compounding of the high silica fiber and the magnesium-calcium fiber.
In the preparation process of the high-temperature-resistant low-biological-durability composite fiber felt, in the step d, the density of the atomized silica sol in the cotton collecting bin reaches 2 kilograms per cubic meter. The high silica fiber and the magnesium-calcium fiber can be compounded under the density.
Compared with the prior art, the high-temperature-resistant low-biological-persistence composite fiber felt has the following advantages: the heat preservation and insulation performance is strong: the thermal conductivity coefficient is less than or equal to 0.035w/mk at normal temperature, the thermal conductivity coefficient at high temperature is 10% lower than that of the like products, the maximum long-term use temperature of the composite fiber can reach 900 ℃, the composite fiber can be safely used for the heat insulation requirement of the exhaust system of the new turbocharged engine, and the requirement of national six-emission ternary catalytic purification temperature can be met; the bulk density of the material is about 120-210Kg/m3, the bulk density range is wide, and the material can be suitable for various heat shields with requirements on weight; the thickness of the material can be as thin as 1.5mm, and the requirement of a high-performance automobile chassis on the space of a structural part is met; low biological persistence and environmental protection requirements: the Fraunhofer official certificate of the European Union environmental protection regulation is met, the metabolism time in a human body is less than 30 days, and the classification of carcinogens is avoided for the European Union; the treatment after use is harmless to the environment due to the natural degradation property; ultra-clean: the material has no obvious particles such as slag balls and the like, ensures the tightness of the material under long-term thermal shock and high temperature, does not leak, and does not cause pollution and erosion to the environment.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
The high-temperature-resistant low-biological-persistence composite fiber felt comprises high-silica fibers and magnesium-calcium fibers, wherein the high-silica fibers and the magnesium-calcium fibers are interwoven in a ratio of 1:1, the diameter of the high-silica fibers is 1-3 mu m, the length of the high-silica fibers is 95-105 mm, the diameter of the magnesium-calcium fibers is 3-4 mu m, and the length of the magnesium-calcium fibers is 15-20 mm.
The high-temperature resistant low-biological-durability composite fiber felt comprises the following chemical components: mainly comprises 75-80% of silicon dioxide, 10-12% of calcium oxide, 10-12% of magnesium oxide and about 1% of impurities, namely aluminum oxide.
The preparation process of the high-temperature-resistant low-biological-persistence composite fiber felt comprises the following steps of:
a. preparing raw materials: respectively grinding the magnesia, the limestone and the quartz sand into fine powder of 1-3 mm by ball milling equipment, and then mixing the magnesia, the limestone and the quartz sand which are ground into fine powder according to the weight ratio of 1-1.2: 1-1.2: 2-2.4, feeding the mixture into a stirring device, and fully stirring and mixing to obtain a fine powder raw material;
b. and (3) calcining: conveying the fine powder raw material to an electric melting furnace through a conveyor belt at a conveying speed of 50 kg/min, heating the electric melting furnace by three silicon-molybdenum rod electrodes with the diameter of 200 mm, and melting the fine powder raw material into raw material slurry at the working temperature of the electric melting furnace of 1900-2100 ℃ (preferably 2000 ℃);
c. throwing: conveying the raw material slurry to a high-speed roller, wherein the high-speed roller is a titanium alloy roller, the diameter of the high-speed roller is 100mm, the rotating speed of the high-speed roller is 20000-22000 r/min, the raw material slurry is thrown out and cooled after contacting the high-speed roller to form magnesium-calcium fibers, the diameter of the formed magnesium-calcium fibers is 3-4 μm, the length of the magnesium-calcium fibers is about 15-20 mm, and the formed magnesium-calcium fibers are sucked into a cotton collecting bin through negative pressure;
d. composite fiber: the cotton collection bin sucks high silica fibers through negative pressure of 20-23KPA, the diameter of the sucked high silica fibers is 1-3 mu m, the length of the sucked high silica fibers is 95-105 mm, meanwhile, the high-pressure atomized silica sol is sent into the cotton collection bin, the density of the atomized silica sol in the cotton collection bin reaches 2 kg/cubic, airflow of 5-8 m/s is formed through the negative pressure of 20KPA in the cotton collection bin, and the high silica fibers and the magnesium-calcium fibers in the cotton collection bin are compounded to form composite fibers under the action of the atomized silica sol through the airflow formed through the negative pressure;
e. knitting: and (3) conveying the composite fiber to needling equipment, repeatedly needling the mixed fiber by using barbed needles in the needling equipment to interweave the high silica fiber and the magnesium-calcium fiber in the composite fiber, wherein the needling equipment can adopt a needling machine which is manufactured by ANDRITZ and has the model number of N-354, and the composite fiber felt with high temperature resistance and low biological durability can be obtained after being knitted for about 2-3 minutes in the needling machine.
In the steps b and c, the electric melting furnace is arranged right above the high-speed roller, the bottom of the furnace body of the electric melting furnace is provided with a flow opening, the diameter of the flow opening is 9-11 mm (preferably 10mm), and the raw material slurry in the furnace body of the electric melting furnace flows onto the high-speed roller through the flow opening. The raw material slurry flows to the high-speed roller through the flow port by gravity, the flow of the raw material slurry can be controlled by the diameter of the flow port, and the uniform size of the magnesium-calcium fibers formed by throwing the fibers by the high-speed roller is ensured.
The test results of the high-temperature-resistant low-biological-durability composite fiber felt obtained by the preparation process are as follows:
sample 1: the chemical composition of the high-temperature resistant low-biological-durability composite fiber felt is 75 percent of silicon dioxide, 12 percent of calcium oxide and 12 percent of magnesium oxide;
1. and (3) testing the heat conductivity coefficient: the thermal conductivity coefficient is 0.038W/MK according to ASTMC201 test
2. Refractory temperature: and the refractoriness reaches 850 degrees in GB/T3003-2006 test.
3. Tensile strength: GB/T3003-2006 test, 78 KPA.
4. Shrinking the wire: GB/T3003-2006 test, 3% @900 deg. C, 12 hours.
Sample 2: the chemical composition of the composite fiber felt is 78 percent of silicon dioxide, 10 percent of calcium oxide and 10 percent of magnesium oxide;
1. and (3) testing the heat conductivity coefficient: the thermal conductivity coefficient is 0.04W/MK according to ASTMC201 test
2. Refractory temperature: and the refractoriness reaches 920 degrees in GB/T3003-2006 test.
3. Tensile strength: GB/T3003-2006 test, 70 KPA.
4. Shrinking the wire: GB/T3003-2006 test, 3% @900 deg. C, 12 hours.
The test results all meet the design requirements, and the technical problem to be solved by the invention is solved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (7)

1. The preparation process of the high-temperature-resistant low-biological-durability composite fiber felt is characterized by comprising the following steps of:
a. preparing raw materials: respectively grinding the magnesia, the limestone and the quartz sand into fine powder of 1-3 mm by ball milling equipment, and then mixing the magnesia, the limestone and the quartz sand which are ground into fine powder according to the weight ratio of 1-1.2: 1-1.2: 2-2.4, feeding the mixture into a stirring device, and fully stirring and mixing to obtain a fine powder raw material;
b. and (3) calcining: conveying the fine powder raw material to an electric melting furnace, wherein the working temperature of the electric melting furnace is 1900-2100 ℃, and melting the fine powder raw material to form raw material slurry;
c. throwing: conveying the raw material slurry to a high-speed roller, wherein the diameter of the high-speed roller is 100mm, the rotating speed of the high-speed roller is 20000 to 22000 r/min, the raw material slurry is thrown out and cooled after contacting the high-speed roller to form magnesium-calcium fibers, the diameter of the formed magnesium-calcium fibers is 3 to 4 mu m, the length of the magnesium-calcium fibers is 15 to 20mm, and the formed magnesium-calcium fibers are sucked into a cotton collecting bin through negative pressure;
d. composite fiber: the cotton collection bin sucks high silica fibers at negative pressure, the diameter of the sucked high silica fibers is 1-3 mu m, the length of the sucked high silica fibers is 95-105 mm, meanwhile, silica sol atomized at high pressure is sent into the cotton collection bin, and the high silica fibers and the magnesium-calcium fibers in the cotton collection bin are compounded to form composite fibers under the action of the atomized silica sol through airflow formed at negative pressure;
e. knitting: and (2) conveying the composite fiber to needling equipment, repeatedly needling the mixed fiber through a barbed needle in the needling equipment to interweave high-silica fiber and magnesium-calcium fiber in the composite fiber, and finally obtaining a finished product, wherein the finished product is a high-temperature-resistant low-biological-persistence composite fiber felt which comprises the high-silica fiber and the magnesium-calcium fiber in a ratio of 1:1, the high-silica fiber is interwoven with the magnesium-calcium fiber in a ratio of 1 to 3, the diameter of the high-silica fiber is 1-3 mu m, the length of the high-silica fiber is 95-105 mm, the diameter of the magnesium-calcium fiber is 3-4 mu m, and the length of the magnesium-calcium fiber is 15-20 mm.
2. The process for preparing the high temperature resistant composite fibrofelt with low biological persistence as claimed in claim 1, wherein in the steps b and c, the electric melting furnace is arranged right above the high-speed rollers, the bottom of the furnace body of the electric melting furnace is provided with a spout, the diameter of the spout is 9 mm-11 mm, and the raw material slurry in the furnace body of the electric melting furnace flows onto the high-speed rollers through the spout.
3. The process for preparing the refractory low-biopersistence composite fiber felt according to claim 1 or 2, wherein in the step b, the fine powder raw material is conveyed to an electric melting furnace through a conveyor belt at a conveying speed of 50 kg/min.
4. The process for preparing the high temperature resistant composite fiber felt with low biological persistence as claimed in claim 1 or 2, wherein in the step b, the electric melting furnace is heated by three silicon molybdenum rod electrodes with a diameter of 200 mm.
5. The process for preparing the high temperature resistant low biological durability composite fiber felt according to claim 1 or 2, wherein the high speed roller is a titanium alloy roller.
6. The preparation process of the high temperature resistant low biological durability composite fiber felt according to claim 1, wherein in the step d, the high silica fiber is sucked into the cotton collection bin through a negative pressure of 20-23KPA, an air flow of 5-8 m/s is formed in the cotton collection bin through the negative pressure of 20KPA, and the high silica fiber and the magnesium-calcium fiber are compounded through the air flow.
7. The process for preparing the high temperature resistant low biological durability composite fiber felt according to the claim 1 or 6, wherein in the step d, the density of the atomized silica sol in the cotton collecting bin reaches 2 kg/cubic meter.
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