174 results about "Liquid slag" patented technology

The invention belongs to the technical field of metallurgy, and discloses a method for quickly reproducing after long-term damping-down reproducing of a blast furnace, which comprises the following reproducing steps: step 1, a hearth core active preheating step: before blast reproducing of a main tuyere of the blast furnace or at the initial stage of reproducing, introducing oxygen-containing gas into a hearth central area through at least one iron notch, the central area of the hearth is actively heated; and 2, a drainage channel pre-construction step: opening the other iron notch after the blast of the main tuyere of the blast furnace is recovered and before a large amount of liquid iron slag is formed, and enabling high-temperature coal gas to be sprayed outwards from the iron notch by utilizing the pressure of gas formed in the furnace so as to dredge the hearth, heat the iron notch area and pre-construct the iron slag drainage channel. The cold state problem of the center of the hearth is solved through active preheating, a smooth drainage channel is constructed in advance through high-pressure coal gas flow, an iron notch area is heated, and the fatal risk that a high-temperature liquid phase newly produced in the initial stage of re-production gathers in the front edge area of the tuyere is fundamentally avoided.

This invention relates to the field of iron and steel metallurgy, and more particularly to a continuous casting protective slag that avoids slag inclusions on the surface of low-carbon steel. The continuous casting protective slag is composed of the following components by weight percentage: CaO: 24%-26%, SiO2: 28%-30%, La2O3: 12%-15%, MgO: 1%-2.5%, Na2O: 2.5%-4.5%, Li2O: 1.5%-2%, C: 2.5%-3.0%, Fe2O3: 3.5%-4%, B2O3: 1%-3%, BaO: 8%-10%, F ≤ 1%, with the balance being unavoidable impurities. The slag system of this invention is designed with suitable viscosity and melting point, high surface tension of the liquid slag, and good fluidity, allowing the liquid slag to flow evenly into the meniscus and the gap between the crystallizer. This results in a uniform slag film, moderate slag consumption, and effectively improves slag inclusions and adhesion phenomena on the surface of the continuously cast billet.

The utility model relates to liquid state slagging technology field, and specifically is a kind of closed liquid state slagging device, including sealed tank, flange, slagging groove and drain valve, the water inlet is equipped in the sealed tank top side, the sealed tank both sides are equipped with drive motor and slagging valve, and the slagging valve side is installed flange by pipeline and bolt;The sealed tank bottom both sides are equipped with support frame, the support frame bottom both sides are equipped with lifting foot column, the position between the sealed tank bottom corresponding support frame is equipped with slagging groove and drain valve respectively.A part flows into slagging groove by drain net, after the fine waste slag in liquid water is filtered second time by second filter screen, second filter screen piece water is discharged by opening, and second filter screen is extracted regularly to clean and replace.

The invention discloses a coal by-product resource utilization method based on reduction roasting-magnetic separation enrichment, and belongs to the technical field of coal processing by-product resource utilization. The invention provides a combustion oxidation decarburization-high-temperature reduction roasting-ore grinding dissociation-high gradient magnetic separation combined iron extraction process. Comprising the steps that liquefied slag is oxidized and decarbonized to generate ash (iron-containing minerals are oxidized into Fe2O3), reduction roasting is conducted (Fe2O3 is converted into Fe3O4), ore grinding dissociation is conducted (intergrowth of Fe3O4 and gangue minerals is dissociated, monomer dissociation is achieved, and the magnetic separation efficiency and the iron ore concentrate quality are improved), high-gradient magnetic separation is conducted (Fe3O4 concentrate and non-magnetic gangue tailings are obtained), and efficient iron extraction is achieved. In addition, effective recovery and efficient utilization of resources are achieved, heat generated in the oxidation decarburization and reduction roasting process is used for material drying, concentrate drying and steam generation, heat energy consumption is reduced, and efficient utilization of the combustion heat value is achieved.

This invention relates to the field of mineral wool production technology, specifically disclosing a mineral wool material and its preparation method. The mineral wool material comprises the following raw material components in parts by weight: 60-65 parts of blast furnace liquid slag, and 15-25 parts of conditioning material; the conditioning material comprises 42%-48% quartz sand, 22%-28% coal gangue, 11%-18% modified basalt, and 10%-14% modified lithium feldspar powder; wherein the modified basalt is sodium silicate modified basalt; and the modified lithium feldspar powder is citric acid modified calcined lithium feldspar powder. This invention optimizes the composition of the mineral wool material and the combination of the conditioning material components, reduces the generation of loose cotton and cotton balls, and improves the cotton sizing ratio and the overall performance of the finished wool.

The invention discloses low-viscosity stable casting powder suitable for high-speed continuous casting of Q355B steel, belongs to the technical field of casting powder preparation, and aims at solving the technical problem that the melting performance and the operation stability of existing continuous casting powder need to be further improved in the using process. According to the invention, lithium boron aluminum silicon glass precursor powder, oxygen-nitrogen crystal control micronucleus powder and calcium magnesium phosphorus boron viscoelastic powder are synergistically introduced into the continuous casting mold flux, and systematic configuration is carried out on the preparation and batching process, so that a multi-layer synergistic structure organization path covering the whole process of melting starting, liquid slag formation and slag film evolution is constructed; according to the technical scheme, the casting powder keeps proper viscosity, low melting temperature and short melting time, co-evolution of liquid phase generation and slag film formation is achieved, and stable interface behavior and structural response are shown in actual continuous casting operation; and therefore, the occurrence tendency of defects such as pinhole bubbles, honeycomb bubbles and middle cracks on the surface of the Q355B steel continuous casting billet can be reduced.

The device comprises a supporting arm and a refractory cover installed at one end of the supporting arm, the refractory cover is provided with a downward opening, a plurality of side holes distributed in the circumferential direction are formed in the lower end of the side wall of the refractory cover, an argon outlet facing the lower end opening of the refractory cover is formed in the top of the refractory cover, and an argon outlet facing the lower end opening of the refractory cover is formed in the top of the refractory cover. And an argon pipeline communicated with the argon outlet is arranged in the supporting arm in a penetrating manner. Liquid slag on the liquid level is blown away through argon blown out of an argon outlet in the refractory cover, then the refractory cover is covered above a tapping hole area, molten steel enters the cover through a side hole in the lower end of the refractory cover and then flows into the tapping hole, and primary separation of the steel slag, secondary oxidation of the molten steel and nitrogen absorption are achieved. The slag is effectively prevented from entering the tapping hole area in the later tapping period, formation of vortex flow in a molten pool is slowed down, slag entrapment in the later tapping period is restrained, steel slag is prevented from being mixed out, the slag stopping quality and the molten steel quality are improved, and the metal yield is increased.

The invention belongs to the field of garbage treatment, and particularly relates to a liquid-state deslagging method for household garbage ash. The method for liquid-state deslagging of the household garbage ash comprises the following steps: component determination: determining components of the household garbage ash; selecting a fluxing agent: selecting one fluxing agent or a mixture of at least two fluxing agents as an inorganic fluxing agent according to the components of the household garbage ash; and gasification reaction: mixing the household garbage and the inorganic fluxing agent, carrying out gasification reaction on the obtained mixture, and discharging ash. According to the method provided by the invention, a small amount of inorganic fluxing agent can be added, the melting temperature of the household garbage during gasification reaction is reduced, the energy consumption and the equipment operation cost are reduced, and the fluctuation temperature of a slag discharge port can be met, so that the gasification furnace is free of slag bonding and corrosion and smooth in liquid slag discharge, and the equipment operation stability and operation safety are improved; and smooth liquid deslagging is realized.

This invention discloses a collaborative research method for water modeling and numerical simulation based on slag layer characteristics, belonging to the field of continuous casting technology. The method includes: acquiring data on the crystallizer, submerged entry nozzle, and production process; calculating the weights of the powdered slag layer and sintered layer and converting them into equivalent liquid slag layer thicknesses; establishing a water model, dividing the protective slag into a gravity-driven phase and a confinement phase; establishing a physical model that satisfies geometric, kinematic, and dynamic similarities, and covering the oil layer surface with a thin film material; establishing a numerical calculation model using large eddy simulation and VOF multiphase flow model, and setting the uppermost boundary of the protective slag layer as a non-slip interface; and verifying the water model experimental results with the numerical simulation results. This invention, by covering the physical model with a thin film and setting a non-slip interface in the numerical simulation, introduces for the first time the gravitational pressure and flow confinement effects of the powdered slag layer and sintered layer on the liquid slag layer simultaneously, making the simulation results closer to actual production and improving the accuracy of slag entrapment behavior prediction.

The invention discloses high-silicon aluminum coal of a composite fluxing agent and a preparation method, and belongs to the field of coal chemical industry. Through optimized compounding of dolomite, hematite and rare earth metal, the flowing temperature of the high-silicon-aluminum coal is controlled to be gt; and the temperature of 1500 DEG C is obviously reduced to 1390-1430 DEG C, so that the process requirements of liquid deslagging of the gasification furnace are met. According to the invention, dolomite and hematite are respectively ground into large particle sizes, are mixed and then are finely ground, so that the fluxing agent is uniformly mixed and calcined and then is jointly ground with high-silicon aluminum coal, and the mixing efficiency and dispersity are obviously improved. The composite fluxing agent is wide in raw material source and low in cost, and an effective solution is provided for efficient and clean utilization of the high-silicon-aluminum coal.

This application belongs to the field of metallurgical solid waste resource utilization, and more specifically, relates to a method and system for treating copper smelting slag based on rapid heat preservation and slow cooling technology. The method involves using casting slag with dispersed pores inside the casting to collect high-temperature molten slag in front of the furnace, and then using a heat preservation device to maintain the temperature and slow cool for more than 8 hours. This promotes the sedimentation, aggregation, growth, and maturation of copper-containing particles, significantly increasing the average particle size of copper. After slow cooling, the liquid slag is transferred to an air-quenching heat collection chamber for air quenching and granulation, and the high-temperature flue gas is used for waste heat recovery (for copper concentrate drying, hot steam, or waste heat power generation, etc.). The granulated slag, after cooling and conveying, directly enters the ball mill flotation system, eliminating the need for multi-stage crushing processes and achieving energy saving, consumption reduction, and increased copper recovery rate. This invention realizes large-scale, intelligent, energy-saving, and maximized resource recovery in copper smelting slag treatment, increasing copper recovery rate by 8-15%, saving energy by 30-40%, and shortening the cooling cycle by more than 60 hours.

The present invention belongs to the technical field of coal chemical processing, and discloses a coal hydrogasification furnace system and a hydrogasification method of a liquid slag removal moving bed. In the hydrogasification system of the present invention, the gas outlet of the hydrogasifier is sequentially connected to the air inlet of the hydrogen membrane separator through a pressure reducing tank, a chilled water scrubber, and a gas-liquid separator. A hydrogen outlet and a methane-rich outlet are provided on the hydrogen membrane separator, wherein the hydrogen outlet of the hydrogen membrane separator is divided into two paths and connected to the second air inlet and the third air inlet of the hydrogasifier, and the pressure reducing tank, the chilled water scrubber and the liquid outlet of the gas-liquid separator are all connected to a tar collector. The hydrogasification method of the present invention can realize the controllable product components in the process of stabilizing the hydrogasification of coal, enhance the adaptability of raw materials and the diversity of products, and the methane yield and the yield of high light aromatics (BTX, PCXN) are high.

This invention discloses a method for reducing the refining cost of low-carbon cold heading steel, belonging to the field of iron and steel metallurgical technology. The method includes: recovering molten slag before tapping from the converter; reducing carbon content to below 0.06% in the later stages of smelting; bottom blowing argon after oxygen blowing and measuring oxygen content, dynamically calculating the addition amounts of ferroaluminum and lime; adding ferroaluminum and lime during tapping; adjusting aluminum to 0.050%-0.055% after tapping by feeding aluminum wire; slag breaking and power supply after the molten steel reaches the LF furnace, adding lime at 1.3 times the amount of aluminum added after tapping; raising the temperature to 1600-1605℃ after a second sampling, adding ferromanganese, calculating aluminum loss based on power supply time, and controlling aluminum at 0.035%-0.040%; finally, calcium treatment and soft blowing are performed. This invention achieves low-cost and high-efficiency refining of low-carbon cold heading steel through optimizations such as recovering molten slag, dynamically calculating material addition amounts, moving deoxidation and slag formation forward, reducing material consumption, and replacing large-scale argon agitation for impurity removal.

This application provides a method for enhanced precious metal recovery and full-component utilization through plasma synergistic melting, relating to the field of solid waste recycling. The method involves first mixing solid waste and a reducing agent to obtain a first mixture; then, under a working atmosphere, plasma melting of the first mixture yields high-temperature liquid slag, a liquid matte phase, and a liquid alloy phase; the liquid matte phase and the liquid alloy phase are respectively subjected to hydrometallurgical recovery of precious metals; the high-temperature liquid slag is water-quenched to obtain glass frit; the glass frit is ground and dried to obtain treated glass frit; the treated glass frit and a binder solution are second-mixed to obtain a second mixture; the second mixture is then molded and heat-treated to obtain microcrystalline glass; the solid waste includes waste automotive catalysts, flue gas desulfurization gypsum slag and cyanide tailings, and / or sulfuric acid slag. This method utilizes plasma melting technology to synergistically process multiple complex secondary resources, achieving efficient enrichment of precious metals and high-value conversion of all material components.

The utility model relates to a tin liquid slagging-off device for an electronic tin soldering machine, which comprises a mounting plate, an electric sliding rail mounted on the upper side of the right part of the mounting plate, a hydraulic cylinder connected to the electric sliding rail in a sliding manner, a slagging-off component mounted at the telescopic end of the hydraulic cylinder, a mounting seat mounted on the upper side of the left part of the mounting plate, and a tin bath arranged inside the mounting seat, the right part in the tin bath is connected with an anti-overflow plate, and the right side of the mounting seat is slidably connected with a slag collecting hopper. According to the drossing device, the drossing assembly is arranged, drossing is conducted along with sinking of the drossing head, tin liquid mixed with dross can have enough space to move towards the overflow grooves in the front side and the rear side, the tin liquid flows back to the tin groove, it is avoided that the tin liquid and the dross are mixed and brought out upwards, and then the overall safety of the drossing device is improved; the height of the anti-overflow plate is larger than the overall height of the tin bath, the effect of preventing tin liquid from overflowing can be achieved, the dross can be driven to enter the dross collecting hopper along the inclined face structure of the anti-overflow plate when the dross raking head moves rightwards, and therefore dross raking work is conducted.

The invention is suitable for the technical field of unmanned mine cars, and provides an unmanned mine car automatic path optimization method and system.The method comprises the steps that a preset adaptive path and a specific turning position of a target mine car set used for transferring high-temperature liquid slag in a target mine are obtained, and an initial path feasibility value of the preset adaptive path is obtained; and obtaining historical operation data and a transportation schedule of the target mine. The method not only can dynamically reflect the heat risk possibly occurring in future operation, but also can effectively avoid the problem that the temperature accumulation at the turning is too high on the premise of ensuring the transportation efficiency, and achieves the consideration of the safety and efficiency in the path optimization of the unmanned mine car. Therefore, the method has outstanding application value in the underground mine environment of high-temperature liquid slag transportation, and the scientificity and practicability of scheduling decision can be remarkably improved.

The present disclosure belongs to the technical field of industrial waste solid recycling, and particularly relates to a resource comprehensive utilization process of red mud, fly ash, steel slag and coal gangue solid wastes. By using the resource comprehensive utilization process, Na2CO3, O2 and a reducing agent are added into industrial waste solids for reaction and then molten iron and liquid slag water are separated; a sodium salt is added into the liquid slag water for reaction to obtain a reaction solution and sediment; the reaction solution is successively introduced into a calcium salt precipitation tank, an aluminum salt precipitation tank and a silicic acid tank and then CO2 is introduced into the above tanks for acidification reaction, respectively, and a calcium salt, an aluminum salt, a silicic acid and an alkaline solution are obtained after filtration in sequence.

The utility model relates to a controllable power supply electric furnace equipment device for valuable metal recovery, a furnace body comprises a furnace shell and a furnace cover fixedly arranged at the top end of the furnace shell, an electrode assembly comprises a graphite electrode and a bottom electrode, the graphite electrode is arranged above the furnace cover, the bottom electrode is arranged at the bottom in the furnace shell, and the graphite electrode is arranged above the furnace cover. The bottom electrode is insulated from the furnace shell, and a conducting circuit of the bottom electrode is connected to the short net system. The power supply is an ultralow-frequency controllable polarity power supply device, the input of the power supply is at the primary end of the transformer system, the output of the power supply is the output ends of the power supply cabinet system and the reactor system, and the power supply is output to the short network system. The device can be used for the technical process of gathering valuable metals in the melting smelting of solid waste residues, can deeply recover the valuable metals, improves the recovery rate of the metals, reasonably utilizes the heat of high-temperature liquid slag, directly reduces the metals in the slag, improves the recovery ratio and purity of the metals in the solid waste residues, and reduces the production cost. And meanwhile, solid waste residues obtained after metal extraction are subjected to slag system reconstruction, so that the activity is improved, and the quality is stable.

The invention relates to a quick-release tower-type granulator for granulating high-temperature liquid slag, the granulator is integrally of a pagoda-shaped structure and comprises a flow guide top, a flow guide fan blade groove, a tower-type granulating assembly and a power transmission shaft, and the power transmission shaft is sequentially connected with the flow guide top, the flow guide fan blade groove and the tower-type granulating assembly from top to bottom; the bottom of the flow guide top abuts against the flow guide fan blade groove, and the bottom of the flow guide fan blade groove abuts against the tower type granulation assembly. The pelletizer has the advantages that the pelletizer adopts a sectional detachable structure, can be quickly disassembled and assembled, is convenient to disassemble, transport and assemble on site, is convenient to replace an independent damaged part of the pelletizer, and meanwhile, reduces the cost of integrally replacing the pelletizer due to damage. A multi-layer tower structure with a small upper part and a large lower part is adopted, so that high-temperature liquid slag is deformed and spread to form a slag liquid line, the slag is further crushed and splashed to form small liquid drops, and the effect of granulating the high-temperature liquid slag is achieved.

The application provides a device for measuring slag water evaporation, comprising: a slag quenching tank, an inner cavity of the slag quenching tank forms a slag pool; a slag collecting tank, the slag collecting tank is provided with a slag inlet pipe, a slag outlet pipe, a water supplement pipe and a water outlet pipe, the slag inlet pipe is communicated with the slag pool of the slag quenching tank, the water supplement pipe is provided with a first thermometer and a first flowmeter; a hydraulic circulator, the hydraulic circulator is communicated with the water outlet pipe through a first connecting pipe, the hydraulic circulator is communicated with the slag pool of the slag quenching tank through a second connecting pipe, the hydraulic circulator is provided with a slag water outlet pipe, the slag water outlet pipe is provided with a second thermometer and a second flowmeter; a cooler, the cooler is communicated on the second connecting pipe, the cooler is provided with a third thermometer and a third flowmeter on the water outlet pipe; a controller. The technical scheme of the application effectively solves the problem of water vapor generated in the liquid slag discharge process in the related art, relies on experience to estimate the heat loss, and has a large error.

The present application relates to the field of metallurgy, in particular to a method for improving the success rate of tundish quick change in slab continuous casting machine. The steps include ensuring that the mold is only left with a liquid slag layer and controlling the thickness of the liquid slag layer before the final casting of the old tundish, adding starting slag into the mold and fully melting it into liquid state; picking out the slag ring and slag strip in the mold after the final casting of the old tundish, and melting the fine slag strip; controlling the amount of water sprayed in each link of the straightening machine at the time of stopping and straightening; improving the lifting speed of the tundish and the walking speed of the tundish car during the tundish quick change process, setting the pre-centering scale and pre-centering rod for pre-centering; smearing silicone on the corner seam of the mold before the starting of the new tundish, and inserting the flow barrier and iron sheet into the mold; controlling the time of starting, the slope of the speed-up rate of straightening, and the holding time of the casting speed after the starting of the new tundish. The application of the present application in the tundish quick change process can shorten the quick change time, reduce the generation of waste billets, reduce the risk of accidents, and improve the success rate of quick change.

The invention relates to a method for operating a direct current electric furnace (10) having at least one top electrode (11) and at least one bottom electrode (11.1) for producing an iron melt (1) and liquid slag (2).

The application discloses a method for comprehensively treating red mud and integrating with an alumina production process to realize step-by-step energy utilization, and belongs to the technical field of metallurgy and resource recycling. The method specifically comprises the following steps: oxygen, water vapor, coal powder and red mud powder are sprayed into a flash smelting furnace from a burner at the top of a coal gasification flash smelting furnace, high-temperature heat and high-reducing gas generated by coal gasification are utilized to directly smelt and reduce Fe2O3 in the red mud to produce molten iron, and after the red mud and the coal powder liquid slag are tempered, rock wool or other fiberized materials are directly produced, sodium oxide in the red mud is converted into sodium hydroxide for recycling and reuse; after smelting is completed, high-temperature coal gas waste heat is recovered to produce steam for use in an evaporation section of an alumina production process, coal gas is used in a roasting section of the alumina production process, and roasting tail gas is used for red mud drying. The application realizes integration of red mud treatment and the alumina production process and process reengineering, meets the energy needs of two process courses through clean and efficient step-by-step utilization of coal, realizes energy saving and emission reduction, and has no secondary pollution.

The present invention relates to refractory lining material employed in the metallurgical industry, more specifically, magnesia carbon refractory lining material for electrothermal furnaces in the upstream iron-making process. A process for the smelting of a metalliferous-containing feedstock, the process comprising the steps: i) feeding a metalliferous-containing feedstock material, reductant and fluxes into an electrothermal furnace to form at least one pile arrangement, wherein the electrothermal furnace includes refractory lining material comprising MgO-C, and wherein the refractory lining material has a thermal conductivity above 5 W / mK; ii) heating the pile arrangement in the electrothermal furnace at a temperature of between 1 400°C to 1 700°C to sufficiently melt the pile arrangement to form a liquid metal product, a liquid slag product and a CO-containing gas; iii) carburising the metal product by introducing a source of carbon into the electrothermal furnace; and iv) ensuring the continuous feeding of the metalliferous-containing feedstock material, reductant and fluxes into the electrothermal furnace to preserve the at least one pile arrangement.

This invention provides a protective slag for continuous casting with a diameter of φ1000-1200mm and its application, relating to the field of steelmaking auxiliary materials technology. It comprises 4-8 parts fluorite, 3-10 parts cement clinker, 1-4 parts white alkali, 22-30 parts coke powder, 1-6 parts bentonite, 8-14 parts bauxite powder, 8-15 parts magnesium olivine powder, 32-42 parts blast furnace slag powder, and 2-3 parts binder. By increasing the carbon content, the temperature field difference at different parts of the large cross-section of the liquid surface is effectively alleviated, eliminating the shrinkage porosity in the middle of the continuously cast billet. By increasing the proportion of Al2O3 and MgO, the binary basicity of the prepared protective slag is reduced, the melting temperature is increased, and the crystallization temperature is increased. Combined with increasing the amount of coke powder added, not only can the melting rate be controlled, but also the three-layer structure of the protective slag in the crystallizer can be controlled, resulting in a suitable liquid slag layer thickness, a small sintered layer thickness, and no large slag streaks. The surface of the continuously cast billet shell is less prone to defects, and overall defects are fewer.

The invention discloses a high-manganese steel production device for improving the quality of high-manganese steel, and belongs to the technical field of steel production. A high-manganese steel production device for improving the quality of high-manganese steel comprises a pouring furnace and a pouring pipe, a pipe base matched with the pouring pipe is arranged at the pouring furnace, the pouring pipe inclines downwards, and the inclination angle is f. According to the high-manganese steel production device for improving the quality of the high-manganese steel, the downward inclination angle of the pouring pipe is 12 degrees, and compared with the previous inclination angle of 15 degrees, the distance between a stream in the pouring pipe and a narrow-face copper plate of a crystallizer is shortened and is slightly upward, the time for the stream to reach a meniscus is shortened, the steel flow is increased, and the production efficiency is improved. The temperature drop of the stream flowing out of the water gap when the stream touches the narrow surface and then flows upwards to the meniscus is small, so that the molten steel can be kept at a high degree of superheat at the meniscus, the stability of a liquid slag layer and the uniform heat transfer are facilitated, and the surface quality of a plate blank is improved. And the occurrence probability of bonding and longitudinal cracks is reduced.

The invention provides a liquid slag hot air treatment and heat energy recovery method and system, belongs to the field of smelting, and solves the problems of low waste heat recovery rate and poor flue gas purification effect in the existing liquid slag hot air treatment and heat energy recovery mode. The method comprises the following steps: uniformly falling slag liquid is subjected to gradient air quenching granulation treatment, so that the slag liquid firstly passes through a first air pressure section and then passes through a second air pressure section, and the air pressure of the first air pressure section is lower than that of the second air pressure section; carrying out centrifugal separation on the molten slag subjected to gradient air quenching granulation treatment to obtain slag particles and hot flue gas; the slag particles are turned over and subjected to heat exchange through a vibration bed, hot flue gas is subjected to heat exchange through fluidized quartz sand connected with the vibration bed in series, hot steam and hot air generated in the heat exchange process are recycled, and the hot flue gas generated in the treatment process is purified.

The invention relates to the technical field of ferrous metallurgy, in particular to a control method for reducing impurities on the surface of a medium-thickness plate, which comprises the following steps: firstly, when a tundish is pulled before butt joint, casting powder is melted well and thoroughly, the surface of a crystallizer is covered with a thin layer of liquid slag before running, and a special slag salvaging tool is configured to salvage redundant slag in the crystallizer; the temperature of molten steel in a furnace before butt joint is increased by 5 DEG C so as to reduce caking and cold steel formed on the surface of a blank shell, butt joint casting furnace casting slag is achieved, the content of CaO in the casting powder is increased, the melting point, the melting speed and the viscosity of the casting powder are increased, the melting speed of the casting powder is controlled, the consumption of the casting powder and the thickness of a glass slag layer are reduced, and full-process protective casting is adopted in the final casting process. According to the method disclosed by the invention, by optimizing the field operation of the butt joint process, increasing the viscosity of the casting powder and the surface tension between liquid steel interfaces, adding a protective casting device and the like, the occurrence rate of inclusion on the surface of the medium-thickness steel plate is effectively reduced through the synergistic effect of all the steps.

The utility model discloses a liquid slag waste heat recovery device, which belongs to the field of waste heat utilization of metallurgy, steel and electric power liquid slag discharge furnaces, and comprises a heat insulation cylinder, a heat exchange tube and a heat exchange tube, the bottom of the heat insulation cylinder is connected with a slag flowing groove; the slag cooler is arranged below the heat insulation cylinder, and a slag inlet is formed in the slag cooler; the slag inlet and the slag flowing groove are correspondingly arranged, so that liquid slag in the heat insulation cylinder flows into the slag cooler; a crushing unit is arranged in the slag cooler; the crushing unit is arranged corresponding to the slag inlet so as to crush the liquid slag; the cooling unit is connected with the slag cooler so as to cool and exchange heat for the liquid slag crushed by the crushing unit; and the drainage unit is connected with the hot air outlet of the slag cooler so as to drain heat in the slag cooler into the boiler. The liquid slag waste heat recovery device provided by the utility model is low in operation cost, and can reduce the energy consumption of a boiler on the premise of meeting environmental protection, and the liquid slag waste heat recovery rate can reach more than 80%.

The present application relates to the technical field of steel smelting, and especially relates to a method for accurately measuring the thickness of a liquid slag layer of a protective slag in a crystallizer, which is completed by a measuring device, wherein the measuring device comprises quartz tubes, an air extraction device and a wooden board with holes; several quartz tubes are vertically inserted into the wooden board with holes and fixed, the top of each quartz tube is connected with a conduit, all the conduits are connected with the air extraction device, and the top of the air extraction device is provided with a diffusion valve. The present application has the beneficial effects that the thickness of the liquid slag layer of the protective slag in the whole crystallizer can be measured, the measurement data are more scientific and reasonable, the measurement is accurate, the method is simple to operate and low in cost, and thus is beneficial to popularization and application.