43results about How to "Low preparation efficiency" patented technology

The invention belongs to the technical field of energy-saving and environment-friendly materials, and particularly relates to powder removal prevention aerogel composite insulation felt used for building and industrial energy saving and insulation. The insulation felt comprises an aerogel wet gel solution and a fiber framework material at a weight ratio of (2-30):1. A preparation method of the insulation felt comprises the steps of immersing the fiber framework material into the aerogel wet gel solution according to the aerogel wet gel solution and the fiber framework material at the weight ratio of (2-30):1 to achieve saturation adsorption of the aerogel wet gel solution by the fiber framework material, and then performing drying to obtain the insulation felt. The insulation felt overcomes the problems of high cost and easy powder removal of the existing insulation felt, and is better in performance and more environment-friendly.

A process for synthesizing submicron 4A zeolite by a continuous crystallization method comprises steps as follows: a sodium silicate solution with a certain concentration and a sodium aluminate solution with a certain concentration rapidly react and gel in a linear high-shear emulsifying machine; the gelled product is heated for crystallization in a controllable temperature tubular flowing crystallization reactor; then the crystallized product is washed and filtrated by a continuous filtering apparatus; and finally submicron 4A zeolite is obtained after drying. The invention has the advantages of simple and easy process method for synthesizing zeolite, small device, high preparation efficiency, continuous operation, and average grain diameter of synthesized submicron 4A zeolite smaller than 1 micron.

The invention discloses a three-dimensional carbon fiber reinforced alumina-zirconia composite material and a preparation method thereof. The preparation method comprises the following steps: (1) stabilizing an alumina-zirconia composite sol; (2) under vacuum immersing a three-dimensional carbon fiber preform in the alumina-zirconia composite sol; (3) drying the impregnated three-dimensional carbon fiber preform; (4) performing heat treatment; (5) repeating the impregnation, drying, and heat treatment process from the step (2)-the step(4) for the until weight gain of a three-dimensional carbonfiber reinforced alumina-zirconia composite material intermediate is less than 1% compared with that of the three-dimensional carbon fiber reinforced alumina-zirconia composite material intermediatetreated after last impregnation, drying, and heat treatment process to obtain the three-dimensional carbon fiber reinforced alumina-zirconia composite material. The three-dimensional carbon fiber reinforced alumina-zirconia composite material has the advantages of high temperature resistance, oxidation resistance and excellent mechanical properties and the like.

The invention discloses a three-dimensional silicon carbide fiber reinforced aluminum oxide-zirconium oxide composite material and a preparation method thereof. The preparation method comprises the following steps: (1) stabilizing aluminum oxide-zirconium oxide composite sol; (2) performing soaking, namely performing vacuum soaking on a three-dimensional silicon carbide fiber prefabricated part into the aluminum oxide-zirconium oxide composite sol; (3) drying the soaked three-dimensional silicon carbide fiber prefabricated part; (4) performing thermal treatment; (5) repeating the soaking-drying-thermal treatment process of steps (2) to (4) till the weight of a three-dimensional silicon carbide fiber reinforced aluminum oxide-zirconium oxide composite material intermittent is increased by less than 1% when being compared with that of a former soaking-drying-thermal treatment process, thereby obtaining the three-dimensional silicon carbide fiber reinforced aluminum oxide-zirconium oxidecomposite material. The three-dimensional silicon carbide fiber reinforced aluminum oxide-zirconium oxide composite material disclosed by the invention has the advantages of being good in high temperature resistance and oxidation resistance, excellent in mechanical property, and the like.

The invention discloses a preparation method of a three-dimensional silicon carbide fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The preparation method ofthe three-dimensional silicon carbide fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material comprises the following steps of (1) stabilizing SiO2-ZrO2 composite sol;(2) impregnating three-dimensional silicon carbide fiber prefabricated members into the stabilized SiO2-ZrO2 composite sol; (3) drying the impregnated three-dimensional silicon carbide fiber prefabricated members; (4) performing thermal treatment; (5) repeating the impregnation-drying-thermal treatment process in the steps of (2) to (4) until the weight gain rate of a three-dimensional silicon carbide fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material intermediate in a current impregnation-drying-thermal treatment process relative to a previous impregnation-drying-thermal treatment process is smaller than 1% to obtain the three-dimensional silicon carbide fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The prepared three-dimensional silicon carbide fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material has the advantages of being high in high-temperature resistance and antioxidant and mechanical performance and the like.

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional silicon carbide fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 10%-16%. A preparation method comprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5)repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree, high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation methodis high, and the compact degree and mechanical properties of the prepared composite material are remarkably improved.

The invention discloses a lignin-based super-hydrophobic coating and a preparation method thereof. The lignin-based super-hydrophobic coating is prepared from the following raw material components in parts by mass: 2 to 4 parts of covalently cross-linked lignin micro-nano spheres, 2 to 3 parts of trimethoxy (1H, 1H, 2H, 2H-13 fluorine n-octyl) silane, 1 to 2 parts of epoxy resin and 1 to 2 parts of curing agent. The preparation method comprises the following steps: preparing a covalent cross-linked lignin micro-nano sphere turbid liquid, preparing a lignin micro-nano sphere turbid liquid with low surface energy, preparing a super-hydrophobic adhesive prefabricated liquid, and coating a film. The lignin-based super-hydrophobic coating has the advantages of being low in cost, environmentally friendly, excellent in super-hydrophobic performance and the like, is a novel super-hydrophobic material and has good use value and application prospects, and the preparation method of the lignin-based super-hydrophobic coating has the advantages of being simple in process, mild in preparation condition, low in cost and the like, conforms to the green chemistry concept, is suitable for large-scale preparation, and is onvenient for industrial application.

The invention discloses a construction method of an advanced cast-in-place cover beam. Construction equipment is used. The construction equipment comprises a box body, a first transmission cavity is formed in the box body, a first motor is fixedly arranged in the upper end wall of the first transmission cavity, the lower end of an output shaft of the first motor is in power connection with a powershaft stretching downwards, a sun wheel is fixedly arranged on the outer surface of the power shaft, planet wheels are symmetrically engaged with the left side and the right side of the sun wheel, stirring shafts stretching downwards are fixedly arranged on the inner surfaces of the planet wheels, the outer sides of the planet wheels are engaged with gear rings, the gear rings are fixedly connected with the inner wall of the first transmission cavity, first containing cavities are formed in the lower end wall of the first transmission cavity in a left-and-right-symmetry manner, and a stirringcavity communicates with the portions below the left first containing cavity and the right first containing cavity. By means of the equipment, the preparation efficiency of concrete can be improved,and the preparation time of the concrete can be effectively shortened.

The invention discloses a preparation method of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The preparation method of the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material comprises the following steps of (1) stabilizing SiO2-ZrO2 composite sol; (2) impregnatingthree-dimensional carbon fiber prefabricated members into the stabilized SiO2-ZrO2 composite sol; (3) drying the impregnated three-dimensional carbon fiber prefabricated members; (4) performing thermal treatment; (5) repeating the impregnation-drying-thermal treatment process in the steps of (2) to (4) until the weight gain rate of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material intermediate in a current impregnation-drying-thermal treatment process relative to a previous impregnation-drying-thermal treatment process is smaller than 1% to obtain the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The prepared three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material has the advantages of being high in high-temperature resistance and antioxidant and mechanical performance and the like.

The invention belongs to the technical field of maltose syrup, and particularly relates to a method for preparing extreme high maltose syrup by a multi-enzymatic method. The method includes the steps:dissolving rice starch in deionized water, adding acidifying agents to perform acidifying, and adding alpha-amylase to perform ultrasonic reaction and constant-temperature constant-pressure reactionand obtain primary enzymatic liquid; performing reduced pressure distillation on the primary enzymatic liquid, and adding acidifying agents to obtain acidified primary enzymatic liquid; dissolving pullulanase, beta-amylase and maltase in water to form three-enzyme mixed liquid, performing microwave heating to reach constant temperature, slowly dripping the acidified primary enzymatic liquid, and performing microwave stirring reaction to obtain maltose syrup crude products; finally, performing absolute ethyl alcohol ultrasonic washing and reduced pressure distillation reaction, and performing activated carbon filtration and micro-grid filtration to obtain the extreme high maltose syrup. The method solves the problem that maltose content can only reach 80% in a current process, maltose withthe content of 95% can be stably obtained, glucose content can be controlled below 4.5%, and the method has a good application prospect.

An inductance component and a preparation method thereof, comprising: prefabricating a continuous coil row containing a plurality of hollow coils with the connections of every two adjacent hollow coils being bent feet; placing the continuous coil row into a cavity of a prefabricated mold, the cavity comprising a plurality of sub-chambers and one sub-chamber being used for placing a hollow coil; injecting the prepared soft-magnetic magnetic glue into the cavity to enable the soft-magnetic magnetic glue to coat the hollow coil, and simultaneously exposing the bent feet to the outside to perform magnet forming; cutting the formed semi-finished product; and peeling the exposed bent foot copper wire, and performing metallization to form an electrode to obtain a finished product of the inductance component. The invention has high inductance preparation efficiency, and the obtained product electrode has no risks of a dry joint, poor contact, and the like.

The invention belongs to the technical field of maltose syrup, and specifically relates to a method for preparing ultra-high maltose syrup by a multi-enzyme method. Rice starch is dissolved in deionized water, acidified by adding an acidulant, and α-amylase is added for ultrasonic reaction and constant temperature and pressure. The first-level enzymatic solution is obtained by reaction; after the first-level enzymatic solution is subjected to vacuum distillation, an acidulant is added to obtain an acidified first-level enzymatic solution; then pullulanase, β-amylase and maltase are dissolved in water to form a three-enzyme mixture After microwave heating to a constant temperature, slowly add the acidified primary enzymatic solution dropwise, and carry out microwave stirring reaction to obtain the crude maltose syrup. Finally, after ultrasonic washing with absolute ethanol and vacuum distillation reaction, activated carbon filtration and micro-mesh filtration to obtain ultra-high Maltose syrup. The invention solves the problem that the maltose content can only reach 80% in the current technology, can stably obtain the maltose content reaching 95%, and can control the glucose below 4.5%, and has good application prospect.

The invention discloses a three-dimensional carbon fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional carbon fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional carbon fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional carbon fiber preform reinforced yttrium silicate composite material is 9%-14%. A preparation methodcomprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5) repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional carbon fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree,high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation method is high, and the compact degree and mechanicalproperties of the prepared composite material are remarkably improved

The invention discloses a construction method of a cast-in-place cover beam. Construction equipment is used. The construction equipment comprises a box body, a first transmission cavity is formed in the box body, a first motor is fixedly arranged in the upper end wall of the first transmission cavity, the lower end of an output shaft of the first motor is in power connection with a power shaft stretching downwards, a sun wheel is fixedly arranged on the outer surface of the power shaft, planet wheels are symmetrically engaged with the left side and the right side of the sun wheel, stirring shafts stretching downwards are fixedly arranged on the inner surfaces of the planet wheels, the outer sides of the planet wheels are engaged with gear rings, the gear rings are fixedly connected with the inner wall of the first transmission cavity, first containing cavities are formed in the lower end wall of the first transmission cavity in a left-and-right-symmetry manner, and a stirring cavity communicates with the portions below the left first containing cavity and the right first containing cavity. By means of the equipment, the preparation efficiency of concrete can be improved, and the preparation time of the concrete can be effectively shortened.

Disclosed are a free-traction filtration device capable of carrying out a massive filtering process and continuous automatic operation, and a method of controlling the same. The free-traction filtration device includes a plurality of filter units each consisting of some sheets of stacked plate filters; top and bottom plates configured to support the filter units at upper and lower portions thereof so as to maintain positions of the filter units, the filter units being circumferentially arranged between the top and bottom plates; a spring configured to resiliently support the top and / or bottom plates in a horizontal state; and an operating unit configured to transmit vibration to the filter units arranged between the top and bottom plates.

The invention discloses heart-nourishing health care baijiu and a preparing method thereof. The heart-nourishing health care baijiu comprises baijiu extract of bulk pharmaceutical chemicals and is prepared from, by weight, 7,500 parts to 12,000 parts of baijiu, 25 parts to 50 parts of ginseng, 25 parts to 50 parts of atractylodes macrocephala, 25 parts to 50 parts of radix ophiopogonis, 25 parts to 50 parts of pulp of dogwood fruit, 25 parts to 50 parts of fructus lycii, 25 parts to 50 parts of dried tangerine, 25 parts to 50 parts of rhizoma chuanxiong, 25 parts to 50 parts of saposhnicovia divaricata, 25 parts to 50 parts of poria cocos, 25 parts to 50 parts of panax notoginseng, 60 parts to 120 parts of radix astragali, 30 to 60 parts of pepperweed seeds, 30 parts to 60 parts of prepared rehmannia roots, 30 parts to 60 parts of angelica sinensis, 20 parts to 35 parts of Chinese magnoliavine fruit, 20 parts to 35 parts of safflowers and 20 parts to 35 parts of notopterygium roots. The heart-nourishing health care baijiu is used for treating the symptoms of qi and blood deficiency, palpitation, breath shortness, rapid respiration, hidrosis, mental fatigue, the weak waist and feet and the like, and has the effects of regulating qi and blood, smoothening meridian, tonifying qi and blood, regulating the center, benefiting qi, nourishing the heart, calming spirit, benefiting qi, strengthening exterior, promoting the secretion of saliva, arresting sweating and the like.

The invention discloses a three-dimensional carbon fiber preform enhanced yttrium oxide-aluminum oxide complex-phase ceramic composite material and a preparation method thereof. The composite materialcomprises a three-dimensional carbon fiber preform and yttrium oxide-aluminum oxide complex-phase ceramic, in the yttrium oxide-aluminum oxide complex-phase ceramic, the molar content of Al2O3 is 5%-95%, pores of a three-dimensional carbon fiber preform are uniformly filled with the yttrium oxide-aluminum oxide complex-phase ceramic, and the porosity of the three-dimensional carbon fiber preformenhanced yttrium oxide-aluminum oxide complex-phase ceramic composite material is 10%-15%. The preparation method comprises the following steps; (1) preparing yttrium oxide-aluminum oxide composite sol; (2) carrying out dipping; (3) drying; (4) carrying out heat treatment; and (5) repeating a dipping-drying-heat treatment process in the step (2)-step (4). The composite material has the advantagesof low porosity, high compactness, high temperature resistance, oxidation resistance, excellent mechanical property and the like. The preparation method is high in preparation efficiency, and the compactness and mechanical property of the prepared composite material are improved remarkably.

The invention discloses an automatic RNA preparation device and method, the automatic RNA preparation device comprises a centrifugal device, a solution preparation device, a suction device and a control device, the centrifugal device forms a centrifugal cavity, the centrifugal cavity comprises a feeding chamber and a discharging chamber which are communicated with each other, the solution preparation device comprises a movably arranged mounting seat, the mounting seat is provided with a plurality of containing cavities, and the containing cavities are communicated with the feeding chamber and the discharging chamber. Each containing cavity is provided with a liquid outlet, so that the liquid outlets sequentially pass through and are communicated with the feeding cavities in the moving stroke of the mounting seat; the suction device comprises a barrel and a suction mechanism, the barrel is connected with the liquid storage cavity, the discharging end of the barrel is connected with the pipette tip, so that materials in a discharging cavity are sucked into the liquid storage cavity through the pipette tip when the suction mechanism sucks, and the control device is electrically connected with the suction device and the solution preparation device. The control device is used for controlling the centrifugal device, the suction device and the solution preparation device to move. The automatic RNA preparation device provided by the invention can realize automation and intelligentization of preparation and extraction of RNA.

The invention discloses a novel cast-in-situ cover beam construction method. A construction device is used and comprises a tank; a first transmission cavity is arranged inside the tank; a first motoris fixedly arranged in the upper end wall of the first transmission cavity; the lower end of an output shaft of the first motor is in power connection with a power shaft extending downwards; a sun wheel is fixedly arranged on the outer surface of the power shaft; planet wheels are arranged on the left side and the right side of the sun wheel symmetrically in an engaged mode; a stirring shaft extending downwards is fixedly arranged on the inner surface of each planet wheel; a gear ring is arranged on the outer side of each planet wheel in an engaged mode; the gear rings and the inner wall of the first transmission cavity are fixedly connected; first containing cavities are symmetrically arranged in the lower end wall of the first transmission cavity left and right; and stirring cavities arearranged below the left and right first containing cavities in a communicating mode. The device can improve the concrete preparation efficiency and effectively shorten the concrete preparation time.

The invention discloses a high-activity stone powder-based concrete admixture which comprises a mixture A, a mixture B and a mixture C. The mixture A comprises a water reducing agent, activated clay powder or montmorillonite powder and a surfactant, the mixture B comprises an early strength agent and a thickening agent, and the mixture C comprises a cosolvent and a defoaming agent. Free water is reduced by utilizing the moisture absorption effect of the activated clay powder or montmorillonite powder, so that the influence of a humid environment on the humidity of the concrete mixture is reduced. The strength of the concrete is improved by adding the water reducing agent, the early strength agent and the defoaming agent, and meanwhile, by adding the components such as the surfactant, the thickening agent and the cosolvent, the fusion effect of all the components of the admixture is improved, the stirring and mixing time is shortened, the concrete is more viscous and easy to form, bubbles are reduced, and the strength is further improved.

The invention belongs to the technical field of petroleum refining catalyst preparation equipment, and particularly relates to a petroleum refining catalyst preparation system. The system comprises abottom plate and a supporting plate, a stirring module is arranged above the bottom plate, the stirring module is connected with the supporting plate through a parallel connecting mechanism, the stirring module comprises a box body, a feeding port, a motor and a discharging port; the motor is arranged at the upper end of the box body, an output end of the motor is connected with a spiral plate, the lower end of the spiral plate is connected with a cam, the lower end of the spiral plate is provided with a wire rope screening net, the wire rope screening net is connected with the interior of thebox body, a first air cylinder is arranged in the wire rope screening net, the first air cylinder is in contact with the cam, a second air cylinder is arranged at the lower portion of the interior ofthe box body, the tail ends of the first and second air cylinders are in through connection through an air pipe; the feeding port is connected with a feeding hopper; a shaking plate is arranged belowthe feeding port, and the lower end of the shaking plate is arranged above the spiral plate; a discharging valve is arranged above the discharging port. According to the system, the stirring module is driven to shake in multiple directions by the parallel connecting mechanism, the shaking amplitude of the stirring module is improved, and the shaking effect is improved.

The invention discloses a preparation and separating tower device for chloroacetic acid, which comprises an outer shell, wherein the bottom part of the outer wall at one side of the outer shell is welded with a first supporting platform, and the outer wall of the top end of the first supporting platform is fixed with a fan through a screw; the outer wall of one side of the outer shell far from the first supporting platform is welded with a first supporting platform and a second supporting platform, and the outer wall of the top end of the second supporting platform is fixed with a purifying box through the screw; a duct is plugged at the outer wall of one side of the purifying box closing to the outer shell, and one end of the duct far from the purifying box is plugged on the inner wall of the outer shell. According to the preparation and separating tower device for chloroacetic acid, an unloading door is opened automatically by a hydraulic cylinder, so that the labor force is saved, the working efficiency is improved, and the risk of human body safety by the high toxicity of chloroacetic acid can be avoided; an air quality sensor monitors the quality of gas emission so as to avoid the air pollution in the preparation process; the completely purified gas can be recycled through a recycling pipe, so the energy-saving and environmental protection effects are good; moreover, oil fluid in the reaction can be recycled through an oil outlet pipe, thus the resource is saved and the cost is reduced.

The invention provides a traditional Chinese medicine health product having a chloasma removing effect. The health product is an internal use medicine taking Chinese herbal medicines as main raw materials, and thus the shortcomings that in the prior art, external use medicines or surgical methods in chloasma treatment are poor in therapeutic effects and have side effects and chloasma reoccurs easily are overcome. The traditional Chinese medicine health product has the advantages of being green, safe, good in treatment effect and free of side effects and the like. The invention further provides a method for preparing the traditional Chinese medicine health product. The method is simple and convenient to operate, effective components in traditional Chinese medicine raw materials are effectively extracted, and the health product has the advantages that the health product preparation yield is high and the medicine effect is good.

The invention relates to a medical wastewater treatment method integrating ozone disinfection and enhanced antibiotic drug degradation, and belongs to the technical field of medical wastewater treatment. The method is carried out by adopting an integrated ozone disinfection and enhanced antibiotic drug degradation medical wastewater treatment device. The treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in the A2 / O process, and a magnetic nano ozone bubble water preparation system used for generating magnetic nano ozone bubble water; the method comprises the following steps: effluent in the A2 / O process is treated by a magnetic nano ozone bubble water preparation system to generate magnetic nano ozone bubble water; magnetic nano ozone bubble water is injected into return sludge in the A2 / O process, and the magnetic nano ozone bubble water carries the return sludge to enter the anaerobic tank, the anoxic tank, the aerobic tank and thesedimentation tank for circulation by utilizing the adhesion characteristics of magnetism and nano bubbles. Full-process disinfection and epidemic prevention of medical wastewater treatment can be realized, and antibiotic drug degradation and sludge in-situ recessive reduction are enhanced.

The invention relates to a temperature control and rolling control process for corrosion-resistant low-carbon steel. A control panel controls a rough rolling device to carry out pre-rough rolling on a dephosphorized low-carbon steel plate; the control panel controls the rough rolling temperature detector to detect the actual temperature of the low-carbon steel plate and adjusts the temperature of the low-carbon steel plate to a corresponding value according to comparison between the actual temperature of the low-carbon steel plate and the preset temperature; when the rough rolling device performs formal rough rolling on the dephosphorized low-carbon steel plate, the control panel adjusts the power of each rough rolling roller group in the rough rolling device to a corresponding value according to the thickness of the low-carbon steel plate; during pre-rough rolling, the control panel controls the rough rolling temperature detector to detect the actual temperature of the low-carbon steel plate, and whether the temperature of the low-carbon steel plate is adjusted or not is judged by comparing the actual temperature of the low-carbon steel plate with the preset temperature; and the situation that the low-carbon steel plate cannot be rolled due to the fact that the temperature does not meet the standard in the rough rolling process can be effectively avoided, and the low-carbon steel preparation efficiency is further improved.