225 results about "Liquid slag" patented technology

A molecular sieve catalytic slag melting agent for high-iron coal liquid slag removal comprises 10-20 parts of a loosening and expanding agent, 10-20 parts of a molecular sieve catalyst and 30-60 parts of a fluxing reducing agent, and has the beneficial effects that the loosening and expanding agent can crack and expand ash; vanadium anhydride added in the fluxing reducing agent can promote generation of low-temperature eutectic substances in the ash residues when the mass fraction is lower than 5%. And further, under the action of the molecular sieve catalyst enhanced reaction, the fluxing reducing agent can enhance the reducing atmosphere, promote the conversion of ferric iron in the slag body to ferrous iron, reduce the melting point of an iron-containing compound, promote the conversion of the solid slag body at the slag discharge port to low-melting-point liquid-phase flow slag, and ensure that ash in the furnace is smoothly discharged out of the furnace body. Through reasonable preparation, the slag melting agent developed by the invention can realize fluidization of slag at a slag discharge port within a temperature range of 900 DEG C, avoids unplanned furnace shutdown or safety problems caused by slag blockage, and also can realize the effect of replacing the existing natural gas heating fluxing anti-slag-blocking 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.

The invention relates to a method for predicting reaction equilibrium components of steel slag, and belongs to the technical field of steelmaking methods in the metallurgical industry. According to the technical scheme, the method comprises the following steps: constructing a steel-slag reaction calculation platform, and inputting parameters such as components and mass of molten steel, components and mass of slag liquid, reaction temperature and reaction time; a macro command calculation instruction is edited in FactSage, parameters are read for steel-slag reaction calculation, and the calculation comprises three steps of steel-slag reaction, reaction of reacted molten steel and unreacted molten steel, and reaction of reacted molten slag and unreacted molten slag; and repeatedly calculating the steel-slag reaction at each temperature in the temperature difference range according to the field actual temperature difference, and averaging the calculation results as a final steel-slag reaction component prediction result. According to the method, based on FactSage macro editing calculation, component prediction is carried out on the whole steel slag reaction process, the refining slag performance is evaluated in advance, a theoretical basis is provided for field production, and the cost is effectively reduced.

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 converter slag pit device and a manufacturing method thereof, and belongs to the technical field of converter slag pits. A converter slag pit device comprises a slag pit body, a plurality of side plates are installed on the side walls of the two sides of the slag pit body respectively, fixing pieces are arranged between the adjacent side plates respectively, a front end plate and a rear end plate are arranged at the front end and the rear end of the slag pit body respectively, and a plurality of bottom plates are installed on the bottom wall of the slag pit body. A cavity structure is formed in each bottom plate, and a water inlet pipe and a water outlet pipe which are connected with the cavity structures are arranged on two bottom plates respectively; according to the slag pit structure, the side plates are installed on the two sides of the slag pit body, stable connection between the side plates, inclined installation of the front end plate, the rear end plate and the side plates and installation of the bottom plate are achieved through the fixing pieces, the firm slag pit structure is formed, the overall stability of the slag pit is enhanced through the design, and the high-temperature resistance of the slag pit is remarkably improved; and the impact of high-temperature liquid slag and molten steel generated in the converter smelting process is effectively resisted.

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 provides a method and device for preparing cotton through garbage fly ash coupled coal gangue melting, and the method comprises the steps that a cyclone furnace is preheated through an ANB combustion system, so that the temperature in the cyclone furnace reaches the melting temperature; high-concentration oxygen is prepared through the oxygen generation device, and the high-concentration oxygen is introduced into the cyclone furnace; primary air is introduced into the cyclone furnace, garbage fly ash in the fly ash stock bin and coal gangue in the low-heating-value coal gangue stock bin are put into a feeding opening of the cyclone furnace through the primary air, and melting treatment is conducted through the cyclone furnace; and liquid slag generated after melting treatment is placed in a melting pool, then cotton is formed through high-pressure injection, and the cotton is packaged and put in storage. The method has the beneficial effects of harmlessness, thorough recycling, energy conservation, low treatment cost, treatment of waste with waste, low raw material cost and low energy consumption; the method is suitable for the technical field of waste fly ash resource utilization.

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 discloses an ultrafast cooling dry treatment process method for stainless steel liquid slag. Comprising the following steps: conveying a slag tank filled with stainless steel liquid slag to a working position of a slag turning machine, primarily crushing, rolling and pushing materials to a receiving port of a grate cooler by a roller crusher, primarily cooling the materials by using the stainless steel liquid slag of the grate cooler, and conveying the materials to a next slag cooler for cooling; and the materials are cooled again through the slag cooler and conveyed to a stainless steel slag secondary treatment production line. The method has the beneficial effects that the stainless steel slag primary treatment process production line and the stainless steel slag secondary treatment process production line are both subjected to dry treatment, water cooling is not needed, the water content of the stainless steel slag tailing product is further reduced, the whole production process line does not generate industrial production wastewater, an industrial wastewater treatment procedure is not needed, and the production cost is reduced. Therefore, the construction and operation costs of wastewater treatment facilities are reduced, and the method has the advantage that the surrounding environment is not easily polluted.

The utility model discloses a novel liquid deslagging structure for a high-concentration salt-containing waste liquid incineration boiler, which comprises a conical hopper, the conical hopper is arranged at the bottom end of a hearth and the bottom end of a radiation cooling chamber, and a flue gas baffling structure is arranged on one side of the radiation cooling chamber. According to the utility model, the conical hopper type structure at the bottom of the hearth adopts an air cooling sleeve form, the refractory material with the thickness of 80-120mm is covered inside, the surface temperature of the refractory material is more flexibly controlled by adopting an air cooling mode, and the refractory material is a tabular corundum material with a smooth surface, so that the surface roughness is greatly reduced, the flowing of liquid slag is smoother, and meanwhile, the service life of the furnace is prolonged. A connecting channel of the bottom of an incineration boiler hearth and a radiation cooling chamber, namely a liquid slag discharging area is of a conical hopper structure, a liquid slag discharging opening is formed in the bottom of the conical hopper, the volume of the liquid slag discharging area is reduced through the structure, the volume thermal load is improved, and a dead zone cannot be generated when high-temperature smoke of the hearth flows through the arc-shaped structure; and the temperature distribution is more uniform.

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 invention aims to provide a process for smelting 200-series stainless steel in a VOD (Vacuum Oxygen Decarburization) furnace, which comprises the following steps: adding manganese mineral powder into a steel ladle in advance, then pouring molten stainless steel subjected to primary decarburization in an AOD converter into the steel ladle after slag stopping and tapping, and transporting the steel ladle to a VOD furnace station for vacuum decarburization treatment and reduction treatment after vacuum breaking. The addition amount of the manganese mineral powder is limited by the fact that the thickness of slag in a steel ladle at the initial stage of the vacuum decarburization step is smaller than or equal to 70 mm. The manganese ore is used as one of the manganese alloy sources, the cost is low, the manganese ore powder is firstly added to the bottom of the steel ladle and then poured into the molten steel, the manganese ore powder can be rapidly melted and prevented from escaping, the manganese ore powder is fully utilized in the VOD smelting process, and the yield of the manganese ore powder is increased; in addition, the manganese mineral powder serves as slag and an oxidizing agent in the vacuum decarburization process, the amount of blown oxygen needed by VOD decarburization is reduced, the VOD smelting time is shortened, and the VOD smelting efficiency is improved.

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.