42 results about "Fire clay" patented technology

The utility model relates to a steel ladle upper nozzle brick which comprises a nozzle brick upper section and a nozzle brick lower section, the lower end face of the nozzle brick upper section is connected with the upper end face of the nozzle brick lower section through a fire clay connecting layer, an upper cast hole channel is arranged in the nozzle brick upper section, a lower cast hole channel is arranged in the nozzle brick lower section, and the nozzle brick upper section is integrally sleeved in a seat brick. The upper portion of the nozzle brick lower section is sleeved with the seat brick, the lower portion of the nozzle brick lower section is sleeved with the mechanism base, a mounting plate is sleeved between the mechanism base and the seat brick, and joint filling fire clay layers are arranged between the outer side faces of the nozzle brick upper section and the nozzle brick lower section and the seat brick. The nozzle brick upper section and the nozzle brick lower section are combined and butted to form the nozzle brick single body, so that the volume and the dead weight of the upper nozzle brick single body are reduced, the manufacturing quality of the brick body and the transfer convenience after production and forming are improved, and the upper section or the lower section of the upper nozzle brick can be independently replaced according to the erosion condition after a certain furnace number is achieved. The utilization rate and the service life of the upper nozzle brick are improved, and the effects of reducing cost and improving efficiency are achieved.

This invention discloses a neutral refractory material for medium-frequency induction furnace linings. The raw materials include: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 0.8-1.2 parts by weight of alumina, 1.2-1.8 parts by weight of silicon carbide, and 0.3-0.7 parts by weight of calcium oxide. The preparation method is also disclosed. The method of this invention is simple, with the main components being quartz sand, fire clay, and fluorite, with quartz sand comprising the largest proportion. In addition, some additives such as alumina, silicon carbide, and calcium oxide are added to improve the refractory properties and chemical reactivity of the furnace charge. This results in a material with certain slag resistance and a good service life, exhibiting good overall performance and suitable for melting various metals. The furnace lining mixture is non-toxic, harmless, environmentally friendly, and pollution-free.

The application provides a new method for improving side combustion chamber horizontal row curve, relates to the technical field of coke oven thermal regulation, and is mainly applied to the current large coke oven. With the prolongation of service time, the existence of factors such as the absence of fire clay between the masonry structure of the coke oven, the damage of the masonry, acid and alkali corrosion and the like, the internal leakage phenomenon of the coke oven occurs. Through the optimization and improvement of the equipment, the vertical flue corresponding to the side waste gas on-off valve control of the side combustion chamber is heated by coke oven gas instead of blast furnace gas. The side combustion chamber horizontal row curve in actual operation can be optimized from the'steamed bun type' to the 'oblique line type', and the uniform and stable maturation of the coke in the horizontal direction is ensured.

The high-performance double-layer material energy-saving sliding plate brick comprises a working material layer, a non-working material layer, an iron shell, a fire clay layer, a casting hole and a coating layer, the working material layer and the non-working material layer are compounded to form a sliding plate brick body, the iron shell is fixedly connected with the body through the fire clay layer, the casting hole penetrates through the body and the iron shell, and the coating layer is arranged on the surface of the body. The side, away from the iron shell, of the cast hole and the body is a working material layer, the non-working material layer is tightly attached to the iron shell, and the coating layer is arranged on the surface of the working material layer. The invention aims to provide the high-performance double-layer material energy-saving sliding plate brick which is long in service life, can utilize the waste corundum recycled material, saves resources, reduces the cost and does not affect the overall performance, and the preparation method thereof.

The invention discloses a fireproof door, and belongs to the technical field of fireproof doors. The fireproof door comprises a door leaf and a door frame, wherein the door leaf is hinged to the door frame; the door leaf comprises a first door leaf panel, a second door leaf panel and a door core, and the door core is located between the first door leaf panel and the second door leaf panel. The door core is filled with a powder material, and the powder material comprises the following components in percentage by mass: 85%-92% of fly ash, 4%-15% of refractory soil, 1%-4% of water glass and 3%-15% of water. Wherein the fly ash and the refractory clay both have good fire resistance and heat insulation performance, the water glass is mainly used for bonding the fly ash and the refractory clay, the door leaf filled with the powder material can form a barrier to prevent fire spreading, and the door leaf has good fire resistance and heat insulation performance, so that the door leaf has good fire resistance and heat insulation performance. The fireproof door corresponding to the door leaf also has good fire resistance and heat insulation performance.

The application relates to the technical field of refractory materials, and discloses a kind of micro-expansion high-strength wear-resistant zircon inlaying fire clay and a preparation method thereof.The fire clay is prepared from slide plate brick regenerated material, fused white corundum, alumina powder, calcium aluminate cement, micro-silica powder, special additives and dihydrogen aluminum phosphate binder as raw materials through physical blending.The zircon inlaying fire clay has good cohesiveness in cold state, high resistance to molten steel penetration in high-temperature use, low linear change rate after burning, effectively reduces the shrinkage rate of the fire clay in high-temperature use, and the gap between the used zircon ring and the mother brick at the brick joint is not appeared after using the zircon ring and the mother brick for more than 20 furnaces, which is beneficial to improve the resistance of the zircon inlaying fire clay to molten steel and molten slag erosion, corrosion and penetration.

The utility model relates to the technical field of molten steel storage and transportation equipment, in particular to a masonry structure of a steel ladle heat insulation material. The structure comprises a refractory material lining body located in a steel shell, the refractory material lining body comprises a heat insulation lining, a permanent lining and a working lining, the heat insulation lining is a high-strength heat insulation plate, and the permanent lining is a high-strength heat insulation brick; the high-strength heat insulation plate is built on the inner wall of the steel shell through bonding fire clay; the high-strength heat-insulating bricks are built on one side of the hot surface of the high-strength heat-insulating plate through bonding fire clay; and the working lining is built on one side of the hot surface of the high-strength heat-insulating brick. While heat loss of molten steel is effectively isolated and the temperature of the steel ladle shell is reduced, the overall stability of the steel ladle lining can be ensured, and the technical problems that the steel ladle working lining falls off, production is influenced, and the service life of the steel ladle is short are solved.

The invention provides a treatment method of industrial solid wastes, which relates to the technical field of resources and environments and comprises the following steps: stirring and mixing desulfurized fly ash generated by dry desulfurization of coke oven flue gas and water in proportion to form a sealing material; after the coal charging operation of the coke oven is finished, pouring the prepared sealing material into a gap between a large coal charging cover at the top of the oven and an oven body; in the coking process, the sealing material is dehydrated and cured at the temperature of 80-200 DEG C to form a sealing layer for sealing smoke dust; and after the coke is mature, the cured sealing layer enters a coke oven for combustion treatment along with coal charging operation. According to the invention, the solid waste is utilized and disposed, the desulfurized fly ash solid waste replaces the traditional fire clay, the production cost of coking enterprises is reduced, and the good dehydration curing property of the desulfurized fly ash is utilized to prevent smoke overflow of the coke oven large cover in the coking process.

The utility model discloses a stirring device for fire clay production, including bottom plate, still include: the cover, box, handle, discharge hopper, moving wheel, support frame, overturning subassembly, stirring subassembly, the upside fixed connection of bottom plate support frame, the stirring subassembly of mixing of stirring of fire clay raw material is connected to the box, the utility model discloses open the cover, pour the fire clay raw material and additive of proper amount needing stirring into the box, and close the cover, through stirring subassembly, make the material in the spiral blade axle to the box and mix and stir, make the additive evenly dispersed in the fire clay raw material, to ensure that its performance fully plays, make each component in the fire clay raw material can better combine, when the fire clay is stirred evenly, open the cover, through overturning subassembly, make the box dump, make the fire clay in the box and discharge through the discharge hopper, and the spiral blade axle can also assist the discharge, make the fire clay in the box and discharge smoothly.

This invention provides a method for stabilizing beryllium in lepidolite leaching residue, belonging to the field of lepidolite residue treatment technology. The method comprises the following steps: mixing lepidolite leaching residue with clay powder in a specific ratio, adding water, and pressing the mixture into bricks; firing the bricks in a muffle furnace; and then crushing, grinding, and testing the leaching toxicity of the fired clay bricks. This invention directly uses lepidolite leaching residue as raw material to prepare waste residue that can be safely discharged. It has low production costs, not only achieving resource recycling but also effectively stabilizing the excessive beryllium leaching toxicity in the residue. Furthermore, the resulting clay bricks can possess other excellent properties, meeting industry standards for waste residue discharge.

To provide a three-dimensional printing forming mortar that has properties suitable for printing and a viscosity that ensures good stability of the mortar extruded from a print head, that has sufficient compressive strength, that has low shrinkage, that has high expansibility, that has low CO2 emission, and that uses a fired clay as a main component.SOLUTION: A three-dimensional printing forming mortar composition according to the present invention comprises: a cement; 10% to 50% of fired clay with respect to the dry weight of a binder; 2% to 5% of an expanding agent containing calcium oxide and calcium sulfate with respect to the dry weight of the mortar; and an additive or a mixture.SELECTED DRAWING: Figure 1

The present invention relates to the technical field of refractory materials, and provides a tundish thermal insulation refractory material, which comprises the following raw materials by weight: 5-40 parts of alumina hollow spheres, 5-40 parts of hollow ceramsite, 5-30 parts of waste clay bricks, 10-20 parts of flint clay powder, 1-5 parts of refractory clay, 5-20 parts of andalusite powder, 5-20 parts of refractory cement, 0.1-0.5 part of a water reducing agent, 0.1-0.5 part of melamine, 0.5-1 part of alum, and 0.2-0.3 part of benzamidoxime. Through the technical scheme, the problem of insufficient strength of the refractory material for heat preservation of the tundish in related technologies is solved.

The application discloses a kind of detection devices for the internal humidity of fire clay, including support, multiple humidity detection sensors and control end, the support is T-shaped structure, wherein the horizontal bar of support upper end is cylindrical structure, inside hollow structure, the longitudinal rod of support is also hollow structure, both inside communicate, multiple humidity detection sensors are installed on the horizontal bar and longitudinal rod of support, humidity detection sensor is installed the support is fixed in fire clay, the control end is fixed box structure, controller and power supply are arranged in this fixed box, fixture is arranged on the side surface of fixed box, it is fixed on longitudinal adjusting rod by fixture, the controller is connected with multiple detection sensors by connecting line, so that the controller can receive the humidity value in multiple humidity detection sensors, so that worker accurately knows the drying condition inside fire clay, can remind worker to replace fire clay in time.

The invention discloses a preparation process of fire clay for magnesia carbon brick masonry, and relates to the field of refractory materials. The fire clay for masonry of the magnesia carbon bricks comprises the following raw materials in parts by weight: 35-45 parts of magnesia particles, 10-20 parts of magnesia fine powder, 5-10 parts of light calcined magnesia, 10-12 parts of modified graphite, 7-9 parts of modified furan resin, 1-1.5 parts of silicon powder, 2-3 parts of aluminum powder, 0.5-0.7 part of carbon fibers, 1.4-1.8 parts of a curing agent and 5-7 parts of a diluent. The synthesized modified graphite is a grafted compound of nano titanium dioxide containing ether bonds and furan rings and zirconium carbide coated crystalline flake graphite; the synthesized modified furan resin is obtained by carrying out dehydration reaction on an alcoholic hydroxyl product containing fluorenone, thioether and naphthylaniline and furan resin. The fire clay disclosed by the invention has excellent normal-temperature / high-temperature fracture-resistant bonding strength and thermal shock resistance and long service life.

1. The name of the design product: packaging box (fire clay moxa moxibustion paste). 2. The use of the design product: for product packaging box. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.

The utility model belongs to the technical field of continuous casting of ferrous metallurgy, and discloses a nozzle for continuous casting. The nozzle for continuous casting comprises a steel shell, an outer-layer fire-resistant body, inner-layer fire clay and an inner-layer fire-resistant body which are sequentially arranged from outside to inside, the outer-layer fire-resistant body is fixedly connected to the inner side of the steel shell, the outer-layer fire-resistant body and the inner-layer fire-resistant body are bonded and fixed through the inner-layer fire clay, and a steel pouring channel is formed in the inner-layer fire-resistant body. According to the nozzle for continuous casting, when the inner-layer refractory body cracks and loses efficacy, the inner-layer refractory body can be replaced, so that the service life of the nozzle for continuous casting is prolonged, consumption of refractory materials can be reduced by only replacing the inner-layer refractory body, emission of solid waste is reduced, and the requirement for a high-cost steel shell is lowered; and the product cost is greatly reduced.

The application relates to the technical field of refractory materials, and discloses a kind of intermediate ladle heat preservation refractory materials, including the following weight parts component raw materials: alumina hollow ball 5~40 parts, hollow ceramic 5~40 parts, waste clay brick 5~30 parts, coke spar powder 10~20 parts, refractory clay 1~5 parts, andalusite powder 5~20 parts, refractory cement 5~20 parts, water reducing agent 0.1~0.5 parts, melamine 0.1~0.5 parts, alum 0.5~1 part, benzamide oxime 0.2~0.3 parts.Through the above technical scheme, the problem of insufficient strength of the intermediate ladle heat preservation refractory material in the related art is solved.

The utility model discloses a kind of ground wire through floor waterproof metal protection pipe, it is related to building electromechanical lightning protection and grounding technical field, including bottom plate, fixed hole, fixed iron nail, ground wire through square hole, metal protection pipe, waterproof ring wing, bolt hole, bolt, jumper yellow-green bicolour line and ground wire;Fixed hole is set in bottom plate edge;Ground wire through square hole is set on bottom plate, and penetrates bottom plate;Metal protection pipe is welded on bottom plate, and welded waterproof ring wing, bolt hole and bolt are equipped on metal protection pipe upper portion;Ground wire passes through metal protection pipe by ground wire through square hole, and inlay fills fire clay, bolt hole and bolt are equipped on ground wire;Jumper yellow-green bicolour line is effectively fixed on metal protection pipe and ground wire by bolt hole and bolt, forms through guide.The utility model can effectively solve that ground wire is easily damaged or dropped by accidental impact, and the periphery of protection pipe is easily leaked, fireproof plugging is not strict, and the problems such as pre-buried positioning are not accurate.

The invention discloses a high-performance aluminum oxide ceramic substrate and a preparation method thereof, and the high-performance aluminum oxide ceramic substrate comprises the following components in parts by weight: 80-90 parts of ceramic balls, 8-15 parts of aluminum oxide, 0.1-05 parts of calcined talc, 0.1-0.3 part of white fire clay, 0.1-0.3 part of lanthanum oxide, 0.1-0.2 part of strontium carbonate and 7-8 parts of water. By optimizing the proportion of components such as the ceramic balls and aluminum oxide and the sintering process, the sintering temperature is lower than that of a traditional sintering mode, energy is saved, the product performance index is good, and the stability is high.

The utility model relates to a mud blocking structure for a blast furnace long-time damping-down tuyere, and belongs to the technical field of blast furnace ironmaking production in the metallurgical industry. According to the technical scheme, the device comprises a blast furnace air supply blowing pipe (1), a blast furnace tuyere large sleeve (2), a blast furnace tuyere medium sleeve (3) and a blast furnace tuyere small sleeve (4), the blast furnace tuyere large sleeve (2), the blast furnace tuyere medium sleeve (3) and the blast furnace tuyere small sleeve (4) are matched with the blast furnace air supply blowing pipe (1), and porcelain front end fire clay (7), porcelain (6) and porcelain rear end fire clay (5) are sequentially pressed into the blast furnace tuyere small sleeve (4). And the boundary dimension is matched with the size of an inner hole of the blast-furnace tuyere small sleeve (4). The device has the beneficial effects that the blocked tuyere can be poked at one time after the blast furnace supplies air, the success rate is 100%, time and labor are saved, and the labor intensity of workers when poking the tuyere is greatly reduced.

The utility model belongs to the technical field of refractory materials, and particularly discloses a split type air brick which is characterized in that a screw sleeve is arranged at the bottom of a brick core cover plate, a structural part is arranged in a cushion brick, the top end of the structural part penetrates through an avoiding hole to be in threaded connection with the screw sleeve, and the tail end of the structural part is in threaded connection with an argon pipeline. A plurality of anchoring claws B are arranged on the outer circle face of the structural part at intervals in the circumferential direction and used for being fixed to a brick lining refractory material body, and during blowing, argon in an argon pipeline can be blown into the bottom of a brick core through a through hole in the structural part. The gap between the cushion brick and the tail part of the brick core can be effectively avoided, the cushion brick can be mounted without the aid of a mounting tool or smearing fire clay, and only a structural part needs to be tightened, so that the damage to the cushion brick caused by manual beating is avoided, the risk that the brick core sinks when the split air brick is used is greatly reduced, the use safety of the split air brick is improved, the operation is simple, and the practicability is high. Time and labor are saved.

The mullite brick with the high breaking strength comprises a stone brick body and a connecting part, the stone brick body comprises a base layer, a first strength layer and a second strength layer, the base layer is made of mullite, high alumina, industrial alumina and refractory clay, the manufacturing method is an electric melting method, and the first strength layer is made of high alumina. By means of the design, the integrity and the overall strength of the stone brick can be effectively enhanced, the first strength layer is a mullite light heat insulation brick manufactured through a foam method, the second strength layer is made of the same material as the base layer, the second strength layer is formed by splicing a plurality of square blocks, honeycomb holes are further formed in the square blocks, and the honeycomb holes are formed in the base layer. Due to the design, the compression resistance and fracture resistance of the stone brick are effectively improved, the connecting part comprises a connecting protrusion and a connecting groove, the connecting protrusion and the connecting groove are fixedly connected to the two sides of the stone brick body respectively, and the connecting protrusion and the connecting groove are matched so that a plurality of stone bricks can be conveniently spliced together.

The utility model discloses a fireproof high-temperature-resistant aluminum alloy cable, which belongs to the technical field of cables and comprises a plurality of cable core structures, a filling layer arranged outside the plurality of cable core structures, a lining layer arranged outside the filling layer, a waterproof layer arranged outside the lining layer and a fireproof mud layer arranged outside the waterproof layer. A buffer layer is arranged outside the fireproof mud layer, a ceramic silicone rubber layer is arranged outside the buffer layer, and a sheath layer is arranged outside the ceramic silicone rubber layer. According to the fireproof high-temperature-resistant aluminum alloy cable, the waterproof layer can prevent moisture generated after the fireproof mud layer is heated from permeating to the cable core structure, and meanwhile, the buffer layer can deform when the fireproof mud layer expands, so that the structural integrity of the porcelainized silicone rubber layer is ensured, and the fireproof performance of the cable is ensured.

The utility model relates to the technical field of power distribution boxes, in particular to a power distribution box bottom hole sealing mechanism which comprises a power distribution box, a base, a first flexible gasket, a second flexible gasket and fireproof mud, the base is installed at the lower end of the power distribution box, and the first flexible gasket is arranged on the inner side of the base and located between the power distribution box and the base; a first bottom hole is formed in the bottom of the distribution box, a second bottom hole is formed in the bottom of the base, and fireproof mud is arranged on the inner side of the first bottom hole and the inner side of the second bottom hole. The sealing mechanism has a structure for effectively sealing the bottom hole of the power distribution box by using the flexible gasket and the fireproof mud together, so that the stability of the electric wire can be enhanced, moisture and dust can be effectively prevented from entering the interior of the power distribution box, normal operation of equipment in the power distribution box is ensured, and the service life of the power distribution box is prolonged. And the service life of the distribution box and equipment in the distribution box can be effectively prolonged.

The application discloses a three-way joint structure of an updraft gas pipeline of a COREX melting gasifier and belongs to the technical field of metallurgical refractory materials. The three-way joint structure comprises a first pipeline section, a second pipeline section and a third pipeline section. The first pipeline section is located at the top of the updraft gas pipeline and adopts a vaulted structure. The second pipeline section is located around the updraft gas pipeline, adopts a thermal insulation layer as a bottom layer and adopts refractory bricks as working face bricks. The third pipeline section is configured as a bent structure and comprises special-shaped structure bricks and pipeline bricks which are spliced with each other. The three-way joint structure of the updraft gas pipeline can improve the bearing capacity of the pipeline and prolong the service life of the three-way joint of the gas pipeline by combining lightweight refractory castable and refractory clay bricks, thereby providing protection for the safe production of enterprises and providing guarantee for the generation and use of high-proportion gas.

The utility model relates to a melting furnace overflow port lip brick device with a steel mold shell, and belongs to the technical field of glass manufacturing equipment. The melting furnace overflow port lip brick device with the steel mold shell comprises a lip brick frame and a lip brick assembly, a plurality of lip brick assemblies are continuously mounted on the lip brick frame; the lip brick assembly comprises a steel mould shell, a positioning pin and an inner lip brick; an inner lip brick is arranged in the steel mould shell; refractory mortar is filled between the inner lip brick and the inner wall of the steel mould shell; a plurality of positioning through holes are formed in the upper end and the lower end of the steel mould shell; a positioning counter bore is formed in the inner lip brick corresponding to the positioning through hole; and positioning pins are assembled between the positioning counter bores and the corresponding positioning through holes in an interference manner. The melting furnace overflow port lip brick device with the steel mold shell is compact in structure and ingenious in design, solves the problem that an existing lip brick is easy to wear by utilizing the characteristics of high temperature resistance and wear resistance of the steel mold shell, and is particularly suitable for the requirements of glass production and use.

The invention discloses a method for preventing steel leakage between a steel ladle upper nozzle and an upper sliding plate, and relates to the technical field of metallurgy. The adding amount of water in the fire clay is controlled, so that the hardness of the fire clay is within a threshold value range; the thickness of the mounting disk is determined based on the deformation resistance of the mounting disk. Breakout of the steel ladle upper nozzle and the sliding plate in the steel pouring process is avoided, serious accidents of continuous casting pouring interruption and continuous casting machine burnout are avoided, considerable economic benefits are brought to iron and steel enterprises, and high-quality development of the iron and steel enterprises is promoted.

The utility model relates to the technical field of wire inlet hole fireproof plugging, in particular to a switch cabinet cable wire inlet hole fireproof plugging rapid installation mold which comprises a first semi-ring, the lower end of the first semi-ring is fixedly connected with a first base, and the surface of the first semi-ring is fixedly connected with a first connecting rod. According to the utility model, the first base is arranged, and the first base is made of a neodymium magnet, so that the first semi-ring and the second semi-ring can be adsorbed at the bottom of the cabinet body under the action of the first base, and at the moment, the rotating handle is screwed to drive the pressing screw rod to rotate, so that the pressing screw rod can be tightly pressed, and the pressing screw rod can be tightly pressed. At the moment, along with the action of threads, a pressing screw rod gradually moves downwards and then abuts against a second pressing plate and a first pressing plate, so that the second pressing plate and the first pressing plate move downwards under the constraint of a sliding groove, at the moment, the second pressing plate and the first pressing plate can extrude fireproof mud inside, then the wire inlet hole is blocked, and the fireproof mud is further pressed.

The utility model discloses a bracket for clay brick firing, and relates to the technical field of brick making equipment. The device comprises a U-shaped bottom frame, a bracket assembly is arranged on the upper surface of the U-shaped bottom frame, and a disassembly and assembly assembly is arranged on the bracket assembly. The bracket assembly comprises a plurality of side plates, the plurality of side plates are fixedly arranged on the upper surface of the U-shaped bottom frame, and a plurality of bracket pieces are detachably mounted among the plurality of side plates; the bracket piece comprises a bracket plate and an anti-sticking pad; by arranging the bracket assembly, green bricks are separately placed on a plurality of bracket pieces in the bracket assembly, a bracket plate supports the green bricks through an anti-sticking pad, the anti-sticking pad prevents the green bricks from being stuck to the bracket plate to cause defects, and ventilation is facilitated by arranging the bracket pieces and a ventilation groove; and meanwhile, the placed green bricks can be transferred through cooperation of a forklift pallet fork and an insertion cavity, the green brick placing operation convenience is improved, the green brick drying effect is improved, and meanwhile green brick deformation caused by green brick stacking is avoided.

The application provides a kind of supplementary ladle drainage sand and a preparation method thereof, and belongs to the technical field of steelmaking continuous casting.A kind of supplementary ladle drainage sand is made of the following raw materials by weight: chrome ore sand 0-75 parts, quartz sand 0-75 parts, zircon sand 0-50 parts, fused magnesite 0-50 parts, light-burned dolomite sand 10-25 parts, diatomite 3-7 parts, carbonaceous material 1-3 parts, and contains at least one of chrome ore sand, quartz sand, zircon sand and fused magnesite.The application is used to solve the practical problems of relatively high moisture and low self-opening rate after replacing the upper nozzle of the supplementary ladle, so that the ladle does not need to be baked after replacing the upper nozzle and applying fire clay, and after directly adding the supplementary ladle drainage sand, the phenomenon of self-opening rate reduction caused by the gasification and escape of moisture in the nozzle fire clay does not occur.