107 results about "Liquid slag" patented technology

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.

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.

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.

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 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 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 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.

The utility model relates to the field of energy and environmental protection technology, especially a kind of coupling system of slag boiler slag heat exchange and fiberization production is discharged to slag.The system includes conveying device, solid slag lifting device, liquid slag discharge boiler, slag well, fiber production line and heat exchanger.Conveying device is fed to boiler by solid slag lifting device, and the liquid slag produced by combustion enters heat exchanger slag conveying passage by slag well, slag conveying pipe, and then is sent to fiber production line;Dusty air of fiber production line returns to boiler by heat exchanger gas pipeline.In heat exchanger, liquid slag exchanges heat with dusty air, and solid slag is solidified on the surface of liquid slag, and dusty air is heated to assist combustion.The system realizes the collaborative coupling of inorganic fiber production and power plant boiler, without new waste gas, improves energy utilization, reduces transfer risk.

The utility model relates to the field of converter tapping, in particular to a powder spraying and slag adjusting device in the converter tapping process. Comprising a slag stopping vehicle and a slag stopping vehicle big arm, a blowing pipe is fixed to the slag stopping vehicle big arm in the length direction, the front section pipe body of the blowing pipe extends to the outer side of the end of the slag stopping vehicle big arm and is bent downwards, the rear section pipe body of the blowing pipe is close to the slag stopping vehicle, and the end of the rear section pipe body is connected with a blowing tank hose. During tapping, the converter is firstly rotated, when the converter rotates until a tapping hole is opposite to the ground, the slag stopping trolley moves to drive a large arm of the slag stopping trolley to extend into the converter through a furnace opening, and powder is sprayed into liquid slag located on the lower portion of an inner cavity of the converter through the spraying and blowing pipe; the method does not need to add magnesium oxide slag with large granularity in the slag splashing furnace protection process depending on an overhead bunker like a traditional method, the slag adjusting time is remarkably shortened, the production efficiency is improved, an existing slag stopping vehicle and a large arm of the slag stopping vehicle are used as carriers for powder spraying and slag adjusting, new equipment does not need to be additionally installed, and the cost is reduced.

The present invention relates to a method of smelting a metalliferous feed material. More particularly, the present invention relates to a method of smelting composite agglomerates comprising a metalliferous feed material, a reducing agent and a fluxing agent using a hot oxidising gas. According to a first aspect of the invention, there is provided a method of carbothermic smelting of a metalliferous feed material using an oxidising gas, comprising the steps of: (i) feeding composite agglomerates into a reactor to create a packed bed within the reactor; wherein the agglomerates comprise a metalliferous feed material, a reducing agent and a fluxing agent; (ii) heating and smelting the agglomerates using a hot oxidising gas, wherein the hot oxidising gas enters the reactor and passes through the packed bed to form a molten material comprising an intermediate slag component and a partially reduced metalliferous component; (iii) introducing the molten material into an electric slag cleaning furnace; (iv) adding additional reducing agent to the molten material in the electric slag cleaning furnace to form a liquid metal product, a liquid slag product and a CO-containing gas; and (v) combusting the CO-containing gas with preheated air to form a hot oxidising gas enriched in oxygen which then enters the reactor in step (ii); wherein the temperature of the hot oxidising gas entering the reactor is controlled to be above 1400°C, and wherein the oxygen content of the hot oxidising gas is controlled to be between 0% and 20%.

The utility model discloses a slag content detection device for alloy liquid, relates to the technical field of slag content detection in the alloy liquid, and aims to solve the problem that the slag content in the alloy liquid cannot be specifically detected at present. A liquid outlet is formed in the crucible, an on-off valve is detachably connected to the liquid outlet, one end, deviating from the crucible, of the on-off valve is communicated with a negative pressure cylinder, the negative pressure cylinder is communicated with a negative pressure pump, a filter mesh used for filtering slag is arranged in the crucible, the filter mesh is arranged above the liquid outlet, and a mass sensor is arranged at the bottom of the negative pressure pump.

The present invention is in the field of metal recycling and concerns a process for the recovery of rare earth elements (REE) and platinum group metals (PGM). The process comprises the steps of preparing a metallurgical charge, comprising PGM- bearing catalysts, REE-bearing swarf and fluxing agents; feeding the metallurgical charge to a smelting furnace operating in reducing conditions; smelting the metallurgical charge, thereby obtaining a liquid Fe-bullion containing the majority of the PGM, and a liquid slag containing the majority of the REE; and, separating the bullion and the slag; wherein the REE-bearing swarf and the PGM-bearing catalysts are smelted simultaneously. The process provides a unique synergy of smelting PGM-bearing catalysts and REE- bearing permanent magnets together, resulting in the recovery of PGM and REE in a single process.

The invention discloses a method for preparing metal chromium, chromium alloy and fused alumina through two-stage reduction, relates to the technical field of metal smelting, and comprises the steps of material preparation and primary reduction, primary separation and metal chromium extraction, secondary reduction and fused alumina preparation, and secondary separation and product collection. The high-temperature liquid slag produced in the first stage is directly and thermally loaded into the direct-current electric arc furnace for the second-stage reaction, so that huge energy consumption caused by remelting of the solid slag is thoroughly avoided. Meanwhile, the waste aluminum-chromium slag is used for replacing aluminum oxide to serve as the fused alumina raw material, the raw material cost is greatly reduced, and harmless treatment and resource utilization of hexavalent chromium in the slag are achieved. The metal chromium is produced in the first stage and is widely applied to the fields of aerospace, navigation, high-end alloy and the like; and in the second stage, chromium alloy is efficiently recycled through a direct-current electric arc furnace and applied to the fields of stainless steel, welding materials and the like, meanwhile, fused corundum is synchronously generated, and a complete and efficient industrial chain is formed.

The invention relates to a method for smelting a metal-containing feedstock. More specifically, the present invention relates to a process for smelting hot and cold metal-containing feedstock mixtures that produce significantly reduced carbon emissions. According to a first aspect of the present invention, there is provided a method of smelting a metal-containing feedstock, the method comprising the steps of: (i) feeding a composition of hot and cold metal-containing feedstocks, a reducing agent, and a fluxing agent into an open furnace (OBF) through a plurality of adjustable feed chutes, wherein the OBF can operate in an open arc mode (short open arc and long open arc control modes), a brush arc mode and a submerged arc mode; (ii) heating the hot and cold metal-containing feedstock, reducing agent and fluxing agent in an OBF at a temperature of 1400 DEG C to 1800 DEG C, sufficiently smelting the feedstock, reducing agent and fluxing agent, thereby forming a liquid metal product, a liquid slag product and a CO-containing gas; (iii) carburizing the metal product by introducing a carbon source into the OBF; and (iv) ensuring that a composition of hot and cold metal-containing feedstocks, a reducing agent and a fluxing agent are continuously fed into the OBF through the adjustable feed chute to optimize the power-feed balance; wherein the carbon content of the liquid metal product is higher than 4.0% (m / m%), and the silicon content is lower than 1.5% (m / m%).

The application discloses a steel slag modification and valuable element recovery method, and relates to the field of recycling of metallurgical industrial waste slag. The steel slag modification and valuable element recovery method comprises the following steps: step 1, after tapping of an initial smelting furnace is completed, a modification agent is added in the bottom of a modification reduction furnace or with liquid slag flow during high-temperature steel slag tapping; step 2, hot molten slag after modification in step 1 is poured into the modification reduction furnace, fuel gas is sprayed at the mouth of the modification reduction furnace to heat the molten slag to 1450 DEG C-1650 DEG C, and the molten slag in the molten pool is stirred; step 3, a reducing agent is sprayed on the modified molten slag at the mouth of the modification reduction furnace; and step 4, after reduction is completed, the molten slag pool is solidified to realize layering of the molten slag and metallic iron liquid. The method provided by the application utilizes the residual heat of the steel slag during tapping to perform molten modification and carbon thermal reduction treatment on the steel slag, and spraying of the fuel gas and the reducing agent ensures that the valuable elements in the slag are reduced as much as possible.

The invention discloses a continuous casting covering slag heating and adding device and method, and belongs to the technical field of metallurgy continuous casting. The device comprises a slag adding opening, a stirring assembly, a temperature sensor, a lifting and overturning driving mechanism, a slag conveying pipeline system, a casting powder adding amount control mechanism, a heat insulation baffle mechanism and a handheld slag conveying pipe. Covering slag is added into the heating box through a slag adding opening, and uniform heating and real-time temperature control are achieved through a stirring assembly and a temperature sensor; the position of the heating box is adjusted through the lifting and overturning mechanism, and heating and deslagging operation is achieved. A heat insulation baffle mechanism is arranged, the heat shielding effect is formed through airflow guiding, and the waste heat influence is reduced; high-temperature casting powder is conveyed to the handheld slag conveying pipe through the high-temperature-resistant slag conveying hard pipe and the flexible hose, and the adding amount is accurately controlled through the mechanically-linked rotatable baffle mechanism. Preheating, heat preservation conveying and quantitative adding of the casting powder can be achieved, the influence of cold-state slag adding on the temperature of the meniscus of the crystallizer is effectively reduced, the stability of a liquid slag layer is improved, bonding breakout and surface defects are avoided, and the stability of the continuous casting process and the casting blank quality are improved. The device is reasonable in structure, flexible to operate and suitable for various continuous casting production scenes.

The invention provides manganese-rich slag and a smelting method thereof.The method comprises the steps that a carbon-containing raw material, silica and manganese ore are crushed and then mixed, and a smelting raw material is obtained; the smelting raw materials are put into an electric furnace to be heated and smelted for 1-1.2 h, and a smelted melt is obtained; transferring the smelted melt into a first steel ladle, standing for 5 + / -0.5 min, and transferring a liquid slag layer at the upper part into a second steel ladle; the liquid slag layer of the second steel ladle is cast after standing, and first solidified slag is obtained after cooling; the molten iron on the lower layer of the first steel ladle stands till the slag layer on the upper layer is solidified, drossing and cooling are conducted to obtain second solidified slag, and the molten iron on the lower layer is cast to obtain iron alloy; and the first solidification slag and the second solidification slag are combined to obtain a manganese-rich slag product. According to the method, the slag-iron separation purity is further improved through a step-by-step separation method, manganese elements can be reduced to enter an alloy phase in the short-time smelting process, and the recovery rate of the manganese elements in the manganese-rich slag is increased.

This application provides a safe production method and apparatus for cast billets, relating to the field of metallurgical technology. The method includes: before performing online fine-tuning of the crystallizer, determining the target thickness of the liquid slag in the crystallizer based on the amplitude of the crystallizer; the liquid slag is used to protect the initial shell of the cast billet during the online fine-tuning operation; the target thickness is greater than the initial thickness of the liquid slag; after performing the online fine-tuning operation, determining the running length of the starting point of the cast billet based on the effective length of the crystallizer and a preset safety factor; and producing the cast billet based on the running length. The safe production method and apparatus for cast billets provided by this application can ensure the safety of the cast billet production process and improve the production quality of the cast billets.

The invention relates to the technical field of harmless treatment of garbage, in particular to a device and method for integrally treating garbage through pyrolysis, gasification and incineration of liquid slag, and the device comprises an integrated treatment furnace which comprises a furnace body, a primary fan, a secondary fan, a high-temperature flue gas fan and a cooling fan. Partition walls are arranged on the upper portion in the furnace body to divide the interior of the furnace body into a pyrolysis area, an incineration area and a cooling area from feeding to discharging, a chain grate is arranged on the lower portion in the furnace body, and a primary air fan and a secondary air fan are connected to the bottoms of the incineration area and the cooling area of the furnace body through a primary air inlet and a secondary air inlet respectively. And the high-temperature flue gas fan and the cooling fan are respectively connected to the tops of the incineration area and the cooling area of the furnace body through pipelines. The system has the beneficial effects that pyrolysis, gasification and incineration of garbage are achieved, efficient recovery of slag heat of iron and steel enterprises is achieved, and meanwhile ecological production of steel mills is achieved by treating urban garbage.

The application discloses a continuously cast mould flux for a shaped medium-carbon steel and application, wherein the continuously cast mould flux for the shaped medium-carbon steel has an alkalinity of 1.45-1.6, a melting point of 1160-1200 DEG C, a viscosity of 0.55-0.8 Pa.s at 1300 DEG C, a melting time of 32-40 s and a crystallization rate of 65-90%. The high alkalinity can ensure good adsorption and inclusion capacity, and meanwhile, the melting point of the mould flux is relatively high; the relatively high melting point can effectively ensure that a proper amount of liquid slag layer is melted when two water outlets pour molten steel under the condition of high liquid surface temperature and large liquid surface fluctuation; the viscosity can ensure that the thickness of the mould flux film between the liquid slag layer and the continuously cast mould is neither too thick nor too thin, and the mould flux can continuously flow in; and the crystallization rate can effectively control the thermal conductivity of the shaped medium-carbon steel at a meniscus, so that the heat transfer of each part of the shaped medium-carbon steel section is reduced, the temperature is relatively uniform, the shrinkage is relatively uniform, the stress is small, and the probability of crack generation is greatly reduced.