1036 results about "Tundish" patented technology

The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a method for removing tundish inclusions based on cooperation of an external electric field and physics. The invention discloses a method for removing tundish inclusions based on cooperation of an external electric field and physics, and mainly aims at solving the problems that as the inclusions in tundish molten steel enter a subsequent continuous casting link, a submersed nozzle is clogged and blocked, and the quality of a casting blank is deteriorated. The key point is that an external electric field and physics synergistic effect is used; a bottom blowing device is arranged to provide power for floating of inclusions; an original baffle weir structure of the tundish is improved, and the probability of catching inclusions is increased; and an external electric field is cooperatively used, so that the inclusions are promoted to float towards the tundish covering agent and be attached to the blocking weir. By means of the method for cooperatively removing the tundish inclusions based on the external electric field and physics, the tundish molten steel inclusions can be obviously removed, the service performance of a subsequent water gap is optimized, the casting blank quality is improved, and the improvement of the high-quality steel smelting level in China is assisted.

The invention relates to the technical field of thin-strip cast rolling, and provides a thin-strip cast rolling tundish continuous casting device and method.The thin-strip cast rolling tundish continuous casting device comprises a base frame horizontally installed on the surface of a foundation, and the base frame is provided with a flow distribution ladle, a tundish and a large ladle from bottom to top; an adjusting mechanism is arranged below the position, where the casting position is arranged, of the base frame, the adjusting mechanism comprises two limiting plates which are symmetrically arranged, and one side of the middle of each limiting plate is fixedly connected with a second motor for driving a crystallizer roller; and a baking oven fixed on the placing rack is arranged above the middle parts of the two motors II. According to the method, molten steel qualified in smelting is directly poured into the molten pool defined by the two crystallization rollers rotating oppositely and the side sealing plates through the large ladle, the tundish and the flow distribution system, the molten steel is cooled through the two crystallization rollers rotating oppositely to form the steel belt with the thickness of 1-5 mm, the production cost can be saved, the casting continuity is improved, the production efficiency is improved, and the yield is increased.

The invention relates to the technical field of continuous casting tundish metallurgy, in particular to a high-performance continuous casting tundish dry material forming method which comprises the following steps: crushing and grinding raw materials, and stirring and mixing according to a formula proportion to obtain candidate raw materials; the candidate raw materials are dried, and particle size distribution of the dried candidate raw materials is obtained; determining vibration parameters in the vibration process according to the particle size distribution, and performing vibration treatment; obtaining the volume density and apparent porosity of the vibrated candidate raw materials, and determining whether the compactness degree of the vibrated candidate raw materials meets a preset standard or not; if the compactness of the vibrated candidate raw materials meets the preset standard, baking control parameters in the baking process are determined based on the volume density and the apparent porosity; and baking treatment is carried out based on the determined baking control parameters, and cooling treatment is carried out after baking is completed, so that the formed tundish dry material is obtained. The strength of the tundish dry material can be guaranteed, and the forming efficiency is improved.

The utility model discloses a tundish dry material automatic feeding device which comprises a stock bin, a discharging channel is arranged at the bottom of one side of the stock bin, a partition plate, a screening funnel and a feeding hopper are sequentially arranged in the stock bin from top to bottom, the partition plate is fixedly connected with the inner wall of the stock bin, and the screening funnel and the feeding hopper are both movably connected with the inner wall of the stock bin. Bagged dry materials are placed in the stock bin, wall breaking treatment is conducted on the bagged dry materials through the material supplementing mechanism, the dry materials fall down from the strip-shaped holes after packaging bags are scratched, the materials are screened after being filtered through the screening funnel, residual impurities can be discharged from the cleaning opening, and the screened materials are conveyed into the discharging channel through the feeding hopper. The material guiding thin pipe and the spiral auger are used for controlling the downward sliding speed and flow of powder, the protective cover communicated with the output end of the conveying hose is matched to convey the material to the tundish, raised dust can be covered, flying dust is reduced, the material supplementing process is efficient, time and labor are saved, and safety is improved.

The invention discloses steel for a battery shell and a preparation method of the steel, and relates to the technical field of steel preparation. The preparation method of the steel for the battery shell comprises the steps of converter treatment, LF refining, RH refining and continuous casting. Starting from the whole preparation process, free oxygen and the production rhythm are controlled through LF refining, time production of RH refining and continuous casting is achieved, converter end point free oxygen control is coordinated, and generation of molten steel inclusions is reduced; rH refining is momentalized and standardized, continuous casting and casting are implemented in a steady state, and the amount of residual steel is controlled, so that secondary generation of inclusions and pollution to tundish molten steel are reduced. The steel for the battery case has the good characteristics of being good in ultra-deep drawing high-plasticity strain ratio, small in anisotropy, high in surface quality and internal purity, fine and uniform in microscopic grain structure and free of the sand hole defect, and is applied to the field of smelting of high-purity steel. The device is expected to be applied to continuous unmanned large-scale production of the highest-speed shell punching machine tool in the world, import substitution is achieved, and the product quality reaches the international advanced level.

The invention belongs to the field of induction heating tundishes, and particularly provides a dual-purpose multi-strand continuous casting induction heating tundish device which comprises a heat-resisting inner cladding layer, an outer protection layer is arranged on the outer side of the heat-resisting inner cladding layer, and the heat-resisting inner cladding layer is connected to the inner side of the outer protection layer in a combined mode. A middle heating layer is formed between the outer protection layer and the heat-resistant inner cladding, casting ladle pipes which are connected in a sealed mode are arranged on the two sides of the middle of the inner bottom face of the heat-resistant inner cladding in a penetrating mode, and the bottoms of the casting ladle pipes extend to the position below the bottom face of the outer protection layer in a penetrating mode; according to the method, the air bricks on the inner bottom face of the tundish are comprehensively laid, a heat-resisting inner cladding layer in the tundish can be protected, the tundish is completely prevented from being eroded and damaged by molten metal, the service life of the tundish is prolonged, argon can be injected into all positions in the tundish through laying of the air bricks, and the service life of the tundish is prolonged. And the impurity removal efficiency and quality of the tundish on the internal molten metal are improved.

The utility model discloses an argon bottom blowing device for improving the purity of molten steel. The argon bottom blowing device comprises a tundish, a water gap is formed in one side of the bottom face of the tundish, an electromagnetic stirrer is arranged on the outer side of the water gap, an air brick is arranged above the water gap in the tundish, and an argon conveying pipe is arranged at the bottom of the air brick. The gas permeable brick is arranged above the water gap, argon is blown into molten steel, the argon directly acts on molten steel flow, a gas curtain wall is formed around the water gap, floating and removal of inclusions are promoted, the purity of the molten steel is improved, the gas permeable brick is used in cooperation with the electromagnetic stirrer, the molten steel can be effectively stirred, a stirring blind area is eliminated, and the service life of the molten steel is prolonged. And the heat transmission of the molten steel in the tundish is more uniform. And moreover, the uniform molten steel flowing is beneficial to keeping the water gap unobstructed, and the water gap is prevented from being blocked by inclusions or cold steel in the molten steel.

The invention relates to the technical field of continuous casting of copper materials, in particular to high-quality copper material pouring equipment which comprises a driving frame and a horizontal continuous casting machine body, an alignment frame is arranged on the top face of the driving frame, and a pouring assembly for pouring molten copper liquid into the horizontal continuous casting machine body is arranged on the alignment frame. A connecting assembly used for moving the alignment frame is arranged between the driving frame and the alignment frame, and two sets of alignment assemblies used for accurately aligning the alignment frame and the horizontal continuous casting machine body are symmetrically arranged on the side face of the alignment frame. Two sets of positioning assemblies matched with the alignment assemblies are symmetrically arranged on the side face of the horizontal continuous casting machine body. By means of the linkage design of the positioning assembly and the alignment assembly, the position of the alignment frame can be automatically adjusted, the tundish and the horizontal continuous casting machine body are accurately aligned to the same horizontal position, it is ensured that a pouring nozzle is aligned to the center of a material opening, and the problem of molten copper splashing or uneven pouring caused by position deviation is solved.

The invention discloses a novel quick-change mechanism with a flow control function for a tundish. The novel quick-change mechanism comprises a mounting part, a sliding part, a pressing part, a first driving part and a second driving part. And the functions of the stopper rod opening and closing device are integrated on the tundish quick-change nozzle device, so that the investment, the installation site, the maintenance cost, the spare part site and the cost of a set of equipment are saved. The two sets of equipment are combined into a whole, so that the number of operators in a steel mill is reduced, and meanwhile, preparation is made in advance for the subsequent steel mill if intelligent and automatic control over steel-making continuous casting is adopted, and the positive effect is achieved.

The invention relates to a method for continuous casting of metal, in particular steel, wherein liquid metal is conducted from a movably mounted ladle (2) into a continuous casting tundish (3) by means of a shroud (4) and is conducted from the continuous casting tundish (3) into a casting mould (16) via an outlet (14), the continuous casting tundish (3) compensating for the interruptions when the ladles (2) are exchanged, and the ladles (2) being mounted in a movement device, wherein, to ensure a high separation efficiency for cast metal charges that follow one another, a singular rolling kind of flow is created in the continuous casting tundish (3), and the invention also relates to a fitting (22, 30) for the continuous casting tundish (3) and to a continuous casting plant (1) comprising the continuous casting tundish (3).

The invention discloses an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking, and belongs to the technical field of refractory materials. The invention discloses an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking. The tundish magnesium-calcium dry material is prepared from the following raw materials in percentage by mass: 44-62.5% of magnesia aggregate, 22.5-24% of dolomite aggregate, 11-28% of magnesia fine powder and 3-5% of a binding agent, the binding agent is silica sol modified by a phosphate esterification aluminic acid ester coupling agent. The preparation method comprises the following specific steps: putting magnesia fine powder, a binding agent, magnesia aggregate and dolomite aggregate into a V-shaped mixing mill, uniformly stirring for 5 minutes, putting the stirred mixture into a mold, ramming, vibrating and molding to obtain a molded green body, curing at room temperature for 24 hours, demolding, drying at 200 DEG C for 24 hours, and carrying out heat treatment in an air atmosphere to obtain a dry material sample. According to the invention, the binding agent with good compatibility with a matrix is prepared by improving the binding agent, so that the binding agent can play a reinforcing role.

The invention belongs to the technical field of cold forging steel manufacturing, and particularly discloses a production method of high-aluminum cold forging steel for medium-strength and high-strength standard parts, which comprises the following steps: controlling the slag alkalinity, the contents of C, S and P in molten steel, the tapping temperature, the thickness of a steel ladle slag layer and the tapping time during converter smelting; a deoxidizing agent, lime, low-carbon ferromanganese, silicon-manganese alloy, aluminum-iron alloy and a carburant are added, argon is blown into molten steel when calcium-iron wires are fed in an argon blowing station, components of a refining slag modifier are controlled to be added during LF refining, calcium carbide and the aluminum-iron alloy are added according to the oxygen content and the aluminum content in the molten steel, a tundish for continuous casting is protected by argon, and the molten steel is continuously cast. The thickness of a powder slag layer and the thickness of a liquid slag layer are controlled, a covering agent is added into the tundish, the purity of molten steel is increased by adjusting the whole process section, and therefore follow-up tundish nozzle nodulation is reduced, and the problem that in the prior art, due to the fact that the purity of molten steel is low, a high-aluminum cold heading steel casting continuous casting tundish nozzle is prone to nodulation is solved.

The invention belongs to the technical field of metallurgy, and provides a method for reducing erosion of a stopper rod in pure iron continuous casting production, which comprises the following steps of: blowing argon to seal a long nozzle bowl opening in a steel casting process, adding a covering agent to execute casting and adding twice in the process, and continuously injecting argon into a tundish impact area and a stopper rod area in the production process. A spinel stopper rod is adopted, and the outer diameter of the slag line part of the stopper rod is increased; by protecting the casting process design and optimizing the size and material of the stopper rod, the problem that the stopper rod is broken in the pure iron production process is solved, and stable and efficient continuous casting production of pure iron is achieved.

The invention relates to a method for controlling cracks of a steel casting blank for a new energy automobile battery pack. The method comprises the steps of casting blank composition control, casting powder performance control, crystallizer inlet and outlet water temperature control, submersed nozzle insertion depth control, molten steel superheat degree control, secondary cooling water distribution specific water flow control, crystallizer taper control and continuous casting machine equipment precision control. The steel comprises, by mass, 0.08%-0.11% of C, 0.55%-0.70% of Si, 2.40%-2.70% of Mn, smaller than or equal to 0.018% of P, smaller than or equal to 0.008% of S, 0.020%-0.070% of Als, 0.015%-0.035% of Nb, 0.02%-0.04% of Ti, 0.15%-0.35% of Cr, smaller than or equal to 0.006% of N and the balance Fe. The alkalinity R of the casting powder ranges from 1.30 to 1.42; 0.6 wt%-0.8 wt% of Li2O is added into the casting powder; when the water inlet temperature of the crystallizer is 25-30 DEG C, the wide surface water inlet and outlet temperature difference of the crystallizer is 2-5 DEG C, and the narrow surface water inlet and outlet temperature difference is 4-8 DEG C; when the water inlet temperature of the crystallizer is 31-36 DEG C, the water inlet and outlet temperature difference of the wide surface of the crystallizer is 4-7 DEG C, and the water inlet and outlet temperature difference of the narrow surface is 5-9 DEG C; constant-pulling-speed pouring is adopted for continuous casting, the tonnage of a tundish is 35-70 tons, and the liquid level fluctuation of a crystallizer is smaller than or equal to + / -5 mm. The defect of'black lines' on the surface of the strip steel of the battery pack for the new energy automobile can be effectively improved, and the surface quality of the battery pack for the new energy automobile is guaranteed.

The invention relates to the field of metallurgy, in particular to a construction technology of a continuous casting tundish dry material and a tundish. According to the continuous casting tundish dry material construction technology, the thickness of a certain dry material is increased, the existing thickness of a tundish wall dry material is adjusted to be larger than or equal to 60 mm from 50-55 mm, and the thickness of a tundish bottom dry material is adjusted to be larger than or equal to 90 mm from 60 mm; meanwhile, the condition of the vibration process is adjusted, the original vibration time of 3 min is adjusted to be larger than or equal to 8 min, and vibration motors are changed into double motors; the baking conditions are adjusted, the baking time is shortened from original 70-90 min to 40-60 min, and the cooling and demolding time is prolonged to be larger than or equal to 4 h; by regulating and controlling the factors, the erosion resistance of the whole dry material is improved, and the service life of the dry material is further prolonged.

The application discloses a tundish dam structure with a flow guide pipe, which comprises a straight wall, a flow guide hole, a side wall, a dam and a flow guide pipe. The straight wall, the side wall and the dam are an integrated structure, and the integrated structure is embedded in the inner wall of the tundish at both ends. The straight wall in the inner cavity of the dam is provided with a plurality of flow guide holes, and the flow guide pipe is embedded on the flow guide hole. The application effectively promotes the removal of inclusions in the impact area and the casting area of the tundish.

The invention discloses a continuous casting tundish mixed steel section dynamic simulation method and system, and aims to solve the problems of physical distortion and dynamic response lag of an existing mixed steel model. The method comprises the steps that S1, the actual measurement size of the tundish is obtained, and the tundish is divided into multiple areas; s2, establishing a nonlinear volume mapping model representing the total volume of molten steel at different liquid levels and the volume ratio of each region; s3, dynamically calculating the weight of each region, the molten steel exchange weight between the regions and the components of new and old molten steel in each time step length; and S4, comparing the molten steel components with target requirements in real time, and determining the position of the mixed steel section. According to the method, the irregular structure and the technological parameter fluctuation of the tundish can be accurately reflected, and the positioning accuracy of the mixed steel section is improved.

The invention discloses a method for improving castability of aluminum-containing steel in a continuous casting process, which comprises the following steps of: S1, controlling components of molten steel, and accurately controlling the content of acid-soluble aluminum in molten steel of a continuous casting ladle to be 0.020-0.060% according to mass percent; s2, calcium treatment is conducted on the molten steel, and the calcium-aluminum ratio is controlled to range from 0.10 to 0.15; s3, continuous casting process control is conducted, specifically, the superheat degree of tundish molten steel is stably controlled to range from 15 DEG C to 30 DEG C, meanwhile, constant pulling speed operation is adopted, and the pulling speed fluctuation range is controlled within + / -0.1 m / min; and S4, the content of SiO in the casting powder is reduced to be smaller than or equal to 20%, and meanwhile, the alkalinity R of the casting powder is 1.5-2.0. The continuous casting process is ensured to be smooth, nozzle nodulation and casting blank surface defects are effectively prevented, and the production efficiency and the product quality are remarkably improved.

The invention relates to a calculation method for predicting the solidification process of a continuous casting billet, and belongs to the technical field of continuous casting methods in the metallurgical industry. According to the technical scheme, a solidification process prediction model is established to predict changes of the temperature and the solid fraction in the casting blank solidification process; the influence of segregation on the solidification process is considered in model building, the concentration of C changes along with the thickness change of a blank shell, the initial value of a casting blank component is a tundish sampling detection value, and the end point value is a casting blank center point detection value; performing casting blank external correction, measuring the surface temperature of the casting blank, and correcting the solidification process prediction model through comparison between the temperature measurement value of the same position and calculation; multi-point correction is conducted in the casting blank, the final stirring strength is increased to enable a white bright band to appear on the cross section of the casting blank, the final stirring position and the distance from the white bright band to the edge are measured, large-rolling-reduction internal crack position measurement is conducted, and the solidification process prediction model is corrected according to the measurement result. The method has the beneficial effects that reasonable optimization of secondary cooling water distribution, tail end electromagnetic stirring and soft reduction process parameters can be accurately guided, and the internal quality of steel is improved.

The present invention relates to the technology of utilizing sensible heat of calcium carbide, and particularly relates to a calcium carbide sensible heat utilization system based on the recycling of heat extraction medium. A calcium carbide sensible heat utilization system based on the recycling of heat extraction medium includes a calcium carbide tundish. The calcium carbide tundish is connected to a rotary drum through a calcium carbide flow trough. The rotary drum has openings at both ends, and an intake buffer chamber and an exhaust buffer chamber are respectively arranged at the discharge end and the feed end of the rotary drum. A rotary gear ring is arranged on the outer wall of the rotary drum, and the rotary gear ring cooperates with a rotary motor. Driven by the rotary motor, the rotary drum rotates continuously. A scraping device is arranged inside the rotary drum. This kind of calcium carbide sensible heat utilization system changes the traditional process of using a calcium carbide pot for cooling, directly uses a high-speed heat extraction gas flow to impact the calcium carbide liquid into scattered point-like falling materials for cooling, which is convenient for the high-speed heat extraction gas flow to absorb heat and utilize the sensible heat, and the heat extraction gas medium can be recycled, saving energy and protecting the environment.

The invention relates to the technical field of slab continuous steel casting in the metallurgical industry, and discloses a method for rapidly replacing a high-carbon steel tundish in slab continuous casting. The method comprises the steps that when the tonnage of an old tundish is 45-50 t, the pulling speed is reduced to 0.8-0.9 m / min; when the tonnage of the old tundish is 22-25 t, the pulling speed is reduced to 0.35-0.45 m / min; when 16-18 t of old tundish molten steel is left, the pulling speed is reduced to 0.1-0.2 m / min; the casting speed is increased to 0.35-0.45 m / min when the liquid level of the crystallizer reaches a set value, and the casting speed is increased to 0.35-0.45 m / min when the casting speed is increased to 0.35-0.45 m / min when the casting speed is increased to 0.35-0.45 m / min; and when the new tundish molten steel reaches 45-50 t, the pulling speed is increased to 0.8-0.9 m / min. According to the method, the problem of tail blank chipping in the normal casting stopping process of the slab continuous casting high-carbon steel can be completely eradicated, and the problem that a joint blank is bumped or a casting blank cannot move in the slab continuous casting high-carbon steel tundish quick changing process is solved.

The invention discloses a universal cutting method for an all-casting machine. The universal cutting method comprises the steps that the all-casting machine is controlled; the all-casting machine comprises pouring equipment, cutting equipment and steel billet transferring equipment. The control step comprises the steps of calculating the length of molten steel of the whole furnace of steel in the fan-shaped section and the total weight of the molten steel of the large ladle as the amount of the molten steel of the fan-shaped section by utilizing a large ladle molten steel casting signal and the stock change of the molten steel of the tundish; the real-time casting blank length, the steel casting length instantaneous values corresponding to the steel head and the blank tail and the steel casting length range, obtained in the step A, of the molten steel of each furnace in the fan-shaped section are matched with the continuous starting and ending positions of each steel blank; the billet circulation module simulates billet circulation by combining billet data with each roller way operation signal, and matches the group of slabs according to the molten steel number of the corresponding smelting furnace number. The problem that finished steel billets with quality problems cannot be effectively and accurately positioned to corresponding molten steel sources due to inconsistent information matching between the steel billets and the corresponding molten steel during steel drawing of existing steel plate square billets can be solved.

The invention discloses a large-section vertical continuous casting cleanliness control method, which comprises the following control processes: 1) adopting a large-section vertical continuous casting machine, and ensuring that the floating time of inclusions in the solidification process of molten steel is 70-82 minutes; (2) when the first ladle of continuous casting is started and the tundish molten steel is in the range of 5-27 tons, slag absorbing agents are added into an impact area and a casting area at the same time; 100-300 kg of a slag absorbing agent is added into the impact area, and 300-500 kg of a slag absorbing agent is added into the casting area; (3) a modulating wave crystallizer electromagnetic stirring technology is adopted, the electromagnetic stirring current parameter ranges from 150 A to 600 A, and the frequency ranges from 1.0 HZ to 1.5 HZ; and 4) adopting a four-hole SEN immersion depth of 90-130mm. According to the method, secondary oxidation of molten steel in a continuous casting starting process can be effectively reduced, adhesion and aggregation of inclusions at a casting blank dendritic crystal solidification front edge are reduced, the inclusions are dispersed and distributed in the steel grade, and the final grades of the inclusions are as follows: the fineness A is less than or equal to 1.0 grade, the thickness A is less than or equal to 0.5 grade, the fineness B is less than or equal to 1.0 grade, the thickness B is less than or equal to 0.5 grade, the fineness C is less than or equal to 0.5 grade, the thickness C is less than or equal to 0.5 grade, the fineness D is less than or equal to 1.0 grade, and the thickness D is less than or equal to 0.5 grade.

The invention relates to a method for preparing rare earth steel by refining prefabricated slag of a CaO-Al2O3-REO-MgO slag system, belongs to the technical field of ferrous metallurgy, and solves the technical problem of how to prepare the rare earth steel by refining the prefabricated slag of the CaO-Al2O3-REO-MgO slag system so as to improve the rare earth yield. The invention discloses a method for refining and preparing rare earth steel by using prefabricated slag of a CaO-Al2O3-REO-MgO slag system. The method comprises the following steps: S1, paving a deoxidizing agent, the prefabricated slag and lime at the bottom of a steel ladle before tapping, and tapping; s2, slag adjustment operation of the LF furnace; step S3, alloying is carried out; s4, treating white slag for more than or equal to 20 minutes, and performing calcium treatment; s5, argon blowing is carried out, and an LF furnace station is left; s6, RH treatment is carried out; s7, adding a rare earth iron alloy; s8, vacuum breaking is carried out after vacuum circulation, and the robot leaves the RH station; s9, a tundish covering agent is scattered on the surface of the molten steel; and S10, the surface of the molten steel is protected through continuous casting crystallizer casting powder. The yield of the rare earth elements is 40% or above.

The invention discloses a rare earth-containing new energy non-oriented silicon steel smelting production method which comprises the following steps: KR desulfurization: slagging-off is carried out twice during desulfurization, the stirring time is 20-25 min each time, and the slagging-off area is greater than 98%; the S content of the treated molten iron is less than or equal to 0.001%; smelting in a converter; performing RH refining; a continuous casting process; and finally, it is guaranteed that recarburization of the tundish is within 5 ppm, aluminum loss ranges from 0.01% to 0.015%, and nitrogen increase is controlled to range from 0.0003% to 0.0005%. The thickness of products which can be stably produced in batches ranges from 0.20 mm to 0.35 mm, various performance indexes of the products meet the requirements of new energy automobile driving motors for materials, and the method can be applied and popularized.

The invention provides a heavy rail steel continuous casting tundish covering agent and application thereof, and the heavy rail steel continuous casting tundish covering agent comprises the following components by mass fraction: 40-55% of CaO, 25-35% of SiO2, 12-18% of MgO, 3-6% of Na2CO3, 2-5% of C, and less than or equal to 1% of FeO + MnO. The tundish covering agent does not contain aluminum, aluminum return of molten steel can be avoided, aluminum oxide inclusions are reduced, and the performance of a steel rail is improved. Meanwhile, the content of magnesium oxide is high, erosion to the tundish dry material can be reduced, and the service life is prolonged.

The utility model discloses a movable dust removal device. Comprising a supporting frame arranged on a continuous casting tundish building station, main rails are arranged on the two sides of the supporting frame, and a movable dust removal cover is installed on the main rails. The movable dust removal cover is used for collecting flying dust at the building stations of the continuous casting tundish, the dust removal cover is movable and operates among the building stations, so that the tundish can be conveniently hoisted and transported by a travelling crane, and the electric hoist is arranged in the dust removal cover, so that a refractory material ton bag can be conveniently hoisted when the tundish is built.

The invention discloses a method for preventing steel ladle roughing slag in a continuous casting process, which comprises the following steps: when 30-40% of molten steel remains in a casting furnace, increasing the casting tonnage of a tundish to 1.1-1.2 times of the continuous casting tonnage; after the tundish casting tonnage rises to 1.1-1.2 times of the continuous casting tonnage, the tundish casting tonnage is kept unchanged as the continuous casting tonnage by controlling the opening degree of a steel ladle sliding plate; when 10%-15% of molten steel is left, the opening degree and the pulling speed of a steel ladle sliding plate are kept unchanged; starting to collect the mass of the tundish, and calculating the change rate of the mass of the tundish according to the collected mass of the tundish and the time interval T; according to the law of the change rate of the tonnage of the tundish, the starting time point when the steel slag is involved in the molten steel is rapidly determined, and a ladle sliding plate water gap is closed, so that the steel ladle slag discharging situation is reduced, the problems of secondary oxidation and slag entrapment of an impact area of the tundish in the tundish changing process are solved, the molten steel cleanliness and the product quality are improved, and the yield is increased.

The invention relates to alkaline ladle filler sand for cleaning molten steel and a preparation method thereof. The alkaline ladle filler sand comprises the following components in percentage by weight: 40-60% of magnesia, 35-55% of magnesia-calcium sand and 2-6% of a waste magnesia carbon brick reclaimed material. The content of MgO and CaO in the alkaline ladle filler sand is larger than or equal to 90 wt%, adding of oxides such as Cr2O3, SiO2, Al2O3 and Fe2O3 which can cause oxygenation of molten steel is reduced, oxygenation of tundish molten steel can be reduced, the molten steel is truly cleaned, the quality of a casting blank is improved, and the alkaline ladle filler sand has the high self-casting rate; the raw materials are easily available and low in cost.

The present invention belongs to the field of metallurgical equipment technology, specifically relating to a continuous casting ladle drainage sand discharge device and its use method. The present invention utilizes an annular left-connected sand trough and an annular right-connected sand trough, forming a full-ring inner bore, as a channel for the molten steel to fall. A drainage cone is positioned at the upper end of the channel. As the drainage sand falls, the cone acts to cause it to fall into the interiors of the first and second sand holding chambers below, enabling recovery. When the molten steel contacts the drainage cone, the high temperature causes the cone to melt and flow along with the molten steel from the channel into the tundish below, preventing the molten steel from contacting the annular left and right sand troughs. After the drainage sand is recovered, a separation mechanism separates the annular left and right sand troughs to either side of the molten steel flow. This effectively prevents splashing caused by contact between the annular left and right sand troughs during movement, thereby extending the service life of the discharge device.