6031 results about "Steelmaking" patented technology

A multi-purpose, multi-oxy-fuel High Temperature Power Burner/Injector/Oxygen Lance, Mechanical System Apparatus Device, for steelmaking from recycled scrap and/or virgin ferrous charge, which can be employed in multi-oxy-fuel (natural gas; pulverized carbonaceous matter; heavy oil), especially by Oxygen Combusted mixture of Natural Gas/Pulverized Carbonaceous Matter in High Temperature Power Burner Mode, for efficient and rapid melting of solid ferrous charge (cold or preheated) in a special steelmaking Metallurgical Furnace or Open Hearth Furnace, Tandem Furnace, BOF, EAF, as its augmenting or only source of thermal energy; more than one Device in Oxygen-Natural Gas/Pulverized Carbonaceous Matter Power Burner Mode, can be employed as the only source of thermal energy in a modified, originally Electric Arc Furnace, as total replacement of Graphite Electrodes and Electric Arc System, the replacement being noticeably more primary energy efficient than the thermal energy provided by Graphite Electrode/Arc System; it also can be employed in an Solid Particles Injector Mode, for injecting of adequately granulated carbonaceous materials or lime into the molten steel for its carburizing or for foamy slag control; further it can be employed in a natural gas shrouded, pulsating oxygen stream, for vertically to the charge oriented soft blow supersonic Oxygen Injection Lance Mode, for decarburization of the molten metal contained in the hearth of the metallurgical furnace and foamy slag control; in one of the embodiments-generally arcuate-pivotally mounted, liquid media cooled composite body, is pivoted into and out of a furnace vessel through a small opening in the shell wall for auto-regulated constant optimal positioning of the Composite Body Tip against solid or molten charge, in each and all multi-purpose modes; furthermore, when inserted into the furnace vessel, the arcuate composite body can be rotated about its longitudinal axis for directing the oxy-fuel high temperature flame towards unmolten charge in the furnace; in an other-generally linear-embodiment, the liquid cooled composite body is attached to the mast type carrier allowing vertical movement of the composite body which enters the furnace vessel through a small opening in the furnace roof; the bimetallic, liquid cooled special tip assembly of both-arcuate and linear embodiments-of the composite body includes easy replaceable, independent, multi-opening nozzles, mounted in a protective, retracted position inside of the liquid cooled special tip assembly.

The invention provides a cold-bonded pellet used on the raw material of steelmaking or ironmaking and a preparation method thereof. The component and the mass ratio of the cold-bonded pellet are as follows: 8 to 60 percent of precipitator dust and dust sludge, 20 to 85 percent of iron sheet, concentrate powder and iron-bearing auxiliary material, 0.4 to 15 percent of binder. In the preparation method, the moisture in raw material is utilized to directly mix the raw material with other components in a mixer, then the mixture is pressed and formed via a briquetting press after uniform mixing, and the pellet after forming is maintained at room temperature and dried naturally. The cold-bonded pellet of the invention has the advantages of the simple forming process, the low fabrication cost, the rapid hardening of pellet and taking the short time, the high compressive strength, achieving not only the waste recycling and reducing the environmental pollution, but also the high granulation rate, the low damage rate, the wide applicability and the stable quality. The invention is especially suitable for wide application in sintering plant, ironmaking plant and steelmaking plant.

The invention belongs to the field of metallurgy, and relates to a method for producing low phosphorus steel by smelting semisteel, which solves the technical problem of controlling the steelmaking end point of a converter within 0.006 percent. The method is mainly realized by adjusting slag-making parameters of the converter smelting by adopting a single slag method, which comprises that: the slag-making materials added in the converter slag-making process consist of 40-50kg of active lime, 20-30kg of high-magnesium lime and 15-25kg of composite slag former based on per ton of tapping molten steel; and the slag-making materials are added in twice. In addition, by controlling an oxygen supply system and an end point control system, the dephosphorization rate of the converter can reach over 92 percent; molten steel containing less than 0.006 percent of phosphorus is obtained; steel ladle slag de-P and alloy re-P are controlled within 0.002 percent. The method can stably produce finished low phosphorus steel containing less than 0.010 percent of phosphorus, and is characterized by simple operation method, small investment on equipment and low production cost.

An improved method and apparatus for EAF steelmaking wherein the method provides additional thermal energy to the steel making process, carbon injection for the formation of foamy slag, and oxygen injection for the decarburization of the melt, the formation of foamy slag and post combustion burning of carbon monoxide. The apparatus comprises a unique burner configuration which has a central conduit for alternatively supplying fluid hydrocarbon fuel or particulate carbon with a carrier gas which are discharged through a exit opening. The fuel or carbon is mixed with a high speed, preferably supersonic, stream of oxidizing gas. The high speed stream of oxidizing gas is provided by an annular supersonic nozzle which causes the oxidizing gas to surround the fuel or the particulates with an annular flow. The annular nozzle design can be adjusted to direct the flows of particulates and oxidizing gases in the areas and shapes desired for efficient management of the steelmaking process. Optionally, the burner can have another conduit for the secondary supply of a pressurized flow of hydrocarbon fluid fuel to a series of apertures which surround the annular flow. Further, optionally, the burner can have another conduit for the supply of a pressurized flow of a secondary oxidizing gas to a series of apertures which surround the annular flow.

The invention discloses a converter smelting endpoint molten steel carbon and temperature control system and a method thereof, and belongs to the technical field of converter steelmaking automation control. The converter smelting endpoint molten steel carbon and temperature control system comprises hardware equipment and a software processing module, and is characterized in that: the hardware equipment comprises converter sublance measuring equipment and converter exhaust gas analysis equipment; the software processing module comprises a converter production process data acquisition module, a converter smelting endpoint carbon calculation module, a converter smelting endpoint temperature calculation module, and an information display module; the software processing module is operated on a computer; and the hardware equipment and the software module are connected with a converter production process database through an Ethernet to realize data interaction. The control system and the method thereof have the advantages of accurately controlling the converter smelting endpoint molten steel carbon content and the molten steel temperature, along with stable operation, cost conservation, and wide application range.

The invention discloses an on-line dynamic optimization control method for a converter steelmaking process based on data driving. The method comprises the following steps: building an off-line prediction model database; building a liquid steel temperature prediction model and a carbon content prediction model by use of a data driving method to obtain a corresponding relationship between operating variables and the temperature and carbon content of liquid steel in the converter steelmaking process; selecting a melt data unit matched with the information of the current converter steelmaking production process and determining a control reference curve of the liquid steel temperature and carbon element content; building a real-time dynamic optimization model of the converter steelmaking process and determining an optimized set value unit of each operating variable; and selecting the set value of each operating variable from the optimized set value unit so as to carry out control operation. The method disclosed by the invention can be used for realizing real-time on-line control over the converter steelmaking process and providing convenience for an operator to set selection conditions according to actual working conditions, thus the production efficiency of a steelmaking plant is improved.

The invention discloses an anti-tear and high temperature resistant conveyor belt, including a skeleton layer, a working face glue-covering layer, a non-working face glue-covering layer, a transverse reinforcement layer and a buffer glue layer. The transverse reinforcement layer is arranged between the skeleton layer and the buffer glue layer and is adjacent to the skeleton layer. The buffer glue layer is arranged between the transverse reinforcement layer and the working face glue-covering layer and is adjacent to the working face glue-covering layer. The skeleton layer adopts low hear shrinkage polyester canvas and the transverse reinforcement adopts polyester curtain net or metal wire. The material of the working face glue-covering layer is made by mixing ethylene propylene diene monomer with other filers with proper proportion. The material of the buffer glue layer is made by mixing the blend glue of ethylene-propylene-diene rubber and natural glue with other fillers of proper proportion. The invention improves the anti-tear and high temperature resistant performances and is widely applied to convey high temperature materials in such industrial enterprises as steelmaking plants, thermal power plants, cement plants, etc.

The invention relates to a method for comprehensive utilization of vanadium-titanium magnetite, which belongs to the field of new technology of direct reduction ironmaking in the metallurgical industry. In order to solve the problems of low utilization of iron, vanadium and titanium in vanadium-titanium magnetite, at the same time, due to the sintering process of traditional technology, the comprehensive energy consumption of the overall smelting process is relatively high, and the environmental pollution is serious. The invention provides a method of agglomerating vanadium-titanium magnetite and producing high-titanium slag and pearl iron by high-temperature reduction and melting in a rotary hearth furnace. The technical solution includes pelletizing of vanadium-titanium magnetite, high-temperature reduction in rotary hearth furnace, magnetic separation, and high-temperature reduction in rotary hearth furnace to directly produce high-titanium slag and pearl iron. Applying this method to process vanadium-titanium magnetite can not only effectively solve the problem of recovery of titanium and vanadium resources, but also obtain qualified iron pearls for steelmaking in electric furnaces, making full use of the iron, vanadium, and Valuable elements such as titanium.

The invention relates to a stirrer for external stirring desulphurization of molten iron before converter steelmaking, aiming at solving the existing deficiencies at present that slags among mixing blades are numerous, large intensity of vortex at the bottom of the metal opposing side of the mixing blades is disadvantageous to the discharging of the involved desulphurization slags. The invention comprises the following measures: the stirrer for desulphurization of molten iron is composed of a metal core 2, a V-shaped rivet firmware 3, a refractory liner 4, a metal chip 6, a V-shaped rivet firmware 7, a double V-shaped rivet firmware 8, a refractory liner 9 and an air cooling tube 10; the metal core 2, the V-shaped rivet firmware 3 and the refractory liner 4 constitute a rotation axis 1; the metal chip 6, the V-shaped rivet firmware 7, the double V-shaped rivet firmware 8, the refractory liner 9 and the air cooling tube 10 constitute mixing blades 5; three mixing blades 5 above the rotation axis 1 are evenly distributed; the front rake angle alpha of the inclined plane from bottom to top of the metal facing water surfaces 11 of the mixing blades 5 is 4.1-30 degrees, the front rake angle beta of the inclined plane from bottom to top of the metal opposing surfaces 12 is 0.1-30 degrees, the camber angle gamma of the inclined plane from bottom to top of the outside surface 13 is 4.1-15 degrees. In the invention, slags among the mixing blades are small, the dynamic condition for stirring desulphurization is excellent, the service life is long and the structure is simple.

The invention relates to a novel industrialized method for comprehensively utilizing vanadium titanium iron ore concentrate. Raw material, an additive and a solid reducing agent are made into a higher-density round ingot through a full automatic press after being mixed evenly by an edge mill; the mixed material is charged into a gradient alloy can and is directly reduced in a tunnel kiln; and after being crushed, the reduced ingot is ground and is magnetically separated to obtain high-quality sponge iron with 92 to 96 percent of TFe and material containing abundant vanadium and titanium with 2.8 to 3.4 percent of V2O5 and 48 to 49 percent of TiO2. After being cold formed, the sponge iron is used for electric steelmaking or is sold as iron powder through deep processing. The material containing abundant vanadium and titanium can be used for producing V2O5 with the purity more than or equal to 98.5 percent through a simplified wet method vanadium extraction process; and vanadium slag with the TiO2 content more than or equal to 48 percent can be used as sulfuric acid method titanium white or other industrial raw materials. The method can greatly improve the capacity of the tunnel kiln and the service life of a charging vessel, has high comprehensive utilization degree, reliable technology, investment conservation and low production cost, energy conservation and emission reduction, and little pollution, and creates conditions for industrialization.

The invention relates to an automatic planning method of a steelmaking and continuous casting heat batch plan and a system thereof, belonging to the IT field and including the following steps: 1, data collection; 2, construction of model; 3, optimization solution; 4, outcome assessment; 5, human-computer interaction; 6, sending down for executing. All indexes of the heat batch plan result obtained by adopting mathematical model and optimization algorithm of the invention are superior to that of the heat batch plan result obtained by the existing on-site manual planning pattern, in addition, the planning time (about 5 minutes) of the automatic planning method of the invention is far shorter than the planning time (about 2-3 hours) of the manual planning pattern. Therefore, the automatic planning method of the invention improves the scientificity of the traditional manual planning pattern, enhances planning level and quality, solves the problem of low efficiency in the manual planning pattern, and provides a scientific method for planning the on-line heat batch plan on a computer integrated manufacturing system in a steel enterprise.

The invention relates to an anti-sticking daubing material applied in steelmaking as well as the preparation method thereof, and is characterized in that the daubing material is composed of the following components by weight percentages as follows: 65 to 80 percent of 0 to 3 mm waste magnesia-carbon brick powder, 10 to 30 percent of waste magnesia-carbon brick powder, 5 to 30 percent of fused magnesia powder, 1 to 4 percent of fine silica powder, 1 to 4 percent of fine Alpha-Al2O3 powder, 0.1 to 1 percent of sodium hexameta phosphate, 0.1 to 0.8 percent of calcium lignosulfonat and 1 to 5 percent of soft clay. The daubing material can prevent the penetration of molten slag by utilizing the lubricating property of graphite in the waste magnesia-carbon bricks, and the slag is not easy to be hung on the surface, thereby not only effectively utilizing the waste magnesia-carbon bricks, but also prolonging the service life and reducing the cost.

The embodiment of the present invention discloses a termination point prediction method and a system for converter steelmaking. The method includes the following steps: collecting current production parameter information in converter steelmaking and current flame information at the mouth of a converter as independent variables; creating a neural network, and training the created neural network with a training sample made up of the independent variables; and predicting the termination point of converter steelmaking by the neural network obtained after the training according to the independent variables, so as to obtain a termination point time prediction result, a carbon content prediction result and a molten steel temperature prediction result. Therefore, with the technical scheme provided by the embodiment of the present invention, by obtaining the production information of the converter and the flame information at the mouth of the converter in real time, the steelmaking terminationpoint time, the molten steel temperature and the carbon content can be analyzed precisely online in real time, so as to precisely control the process to improve the automation and the production efficiency of converter steelmaking and lower the cost.

The invention discloses a titanium-containing calcium aluminate-high alumina bauxite modified refractory material, as well as a preparation method and application thereof, belongs to the field of refractory materials, and adopts the technical scheme that the modified refractory material comprises 25 to 40 wt% of high alumina bauxite, 25 to 40 wt% of titanium-containing calcium aluminate, and 30 to 35 wt% of co-ground powder, and a phenolic resin binding agent which accounts for 3 to 6 wt% of the total mass of the raw materials is additionally added, wherein the co-ground powder is formed by uniformly mixing titanium-containing calcium aluminate fine powder, alpha-Al2O3 micro-powder, graphite powder, silicon carbide fine powder, graphite powder, silicon carbide fine powder, metal aluminum powder and high-temperature asphalt powder; titanium-containing calcium aluminate comprises the following ingredients by ratio: 76.21% of Al2O3, 10.6% of TiO2, 10.16% of CaO, 0.6% of Fe2O3, 1.82% of MgO, and 0.62% of SiO2. According to the invention, titanium-containing calcium aluminate being industrial slag of steelmaking is effectively recycled, so as to greatly reduce the production and manufacture cost; as titanium-containing calcium aluminate is a solid solution of calcium hexaluminate, calcium dialuminate, aluminum titanate, calcium titanate and rutile, the modified refractory material is favorable in thermal shock resistance and heat-insulating property.

The invention discloses an iron-titanium-vanadium extracting method from high-titanium ferrovanadium concentrate ore. By adopting the method to make steel, fine TiCI4 and V2O5 have the advantages that: technological processes are simple and reasonable; energy consumption is low; yield rate of iron-titanium-vanadium is high and three wastes (waste gas, waste water and waste slag) are fewer. The method comprises the steps: iron smelting: a high furnace or an electric furnace is adopted to smelt iron to make melten iron containing vanadium and chromium and make titanium-enriched slag as byproduct and the rate of vanadium reduced and added into iron is 60-78 percent; single-slag steel-making: melten iron containing vanadium and chromium is put into a converter furnace directly to make steel by the function of oxygen blowing, and steel slag containing vanadium and chromium is obtained as byproduct; carbonized titanium-vanadium-chromium slag with 80-95 percent of carbonization rate is made by smelting reduction carbonization by the electric furnace smelting selection; TiCl4 containing vanadium is made by selective chlorination of carbonized titanium-vanadium-chromium slag in a fluidized bed at low temperature, and residual slag of chlorination containing CrCl3 is byproduct; vanadium titanium separation: VOCI3 is directly reduced by cycloolefine or naphthenic acid to make VOCl2 which can not dissolve in TiCI4, while the VOCI3 can be dissolved in TiCI4. Then the fine TiCI4 is made and the slurry TiCI4 containing rich vanadium is also made as byproduct; V2O5 is extracted from the rich vanadium containing slurry TiCI4.

The invention relates to a method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and a good bottom layer. The method comprises the following steps: (1) smelting, casting, making steel by using a converter or an electric furnace, and performing secondary refining and continuous casting on molten steel to obtain a plate blank; (2) performing hot rolling; (3) normalizing: performing two-section normalization, and then cooling; (4) performing cold rolling: rolling the normalized plate into the plate with the thickness of the finished product plate by a primary cold rolling method; (5) performing decarburizing annealing and nitriding annealing; (6) coating MgO coating and annealing at high temperature; and (7) coating insulating coating on the surface of a high-temperature annealing plate and performing heat drawing and flat annealing to obtain the high magnetic induction orientation silicon steel with excellent magnetic performance. According to the method, the problem of nitrogen stability in the plate after nitriding is solved, so that secondary recrystallization in the high-temperature annealing process is perfected and the high magnetic induction orientation silicon steel with excellent magnetic performance (B8 is more than or equal to 1.90 T and P17/50 is less than or equal to 1.00 w/kg), with the good bottom layer and without the defects of crystal exposure and frost descend is obtained finally.

The invention relates to a hard tinned sheet steel produced from low carbon aluminium killed steel so as to solve the technical problems of easy appearance of local edge waves during current pickling rolling production of tinned sheet steel, high incidence of surface iron oxide scale during continuous annealing production, high yield ratio of tin plates, undesirable stamping processing and the like. The hard tinned sheet steel and its raw sheet comprise the following chemical components (by weight): 0.05-0.07% of C, less than or equal to 0.1% of Si, 0.20-0.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.010-0.060% of Alt, less than or equal to 0.0060% of N, and the balance Fe and some inevitable impurity elements. The production method of the hard tinned sheet steel includes: steelmaking, continuous casting, hot rolling, combined pickling rolling, continuous annealing, double-stand tempering, and electrotinning. The hard tinned sheet steel produced in the invention has the advantages of small production control difficulty, excellent appearance quality, thin specification, stable hardness, and good stamping processing performance, etc., can meet the use requirements of high-speed canning, and can be widely used as a food cans, beverage cans, aerosol cans and other packaging materials.

The present invention relates to one kind of cast steel for bearing parts in mechanical lifting system and its making process. The cast steel of Cr-Ni-Mo line consists of C 0.15-0.30 wt%, Mn 0.60-1.10 wt%, Si 0.3-0.8 wt%, Ni 0.4-1.1 wt%, Cr 0.4-1.1 wt%, Mo 0.15-0.40 wt%, S less than 0.025 wt%, P less than 0.025 wt%, and residual elements including Cu, W and V less than 0.60 wt%. The making process of the cast steel includes the following technological steps: making steel in MF furnace or electric arc furnace; casting in sand mold with equivalent circular kiel test rod; normalizing, quenching and tempering of both cast part and test rod in the same furnace; and non-destructive detection of the cast part.

The invention discloses a method for producing cold-rolling low-carbon aluminum killed steel with a uniform through plate mechanical property, which belongs to the technical field of steel rolling. The method comprises the following process flows of: performing krypton (KR) desulfuration treatment, performing steelmaking by using the conventional converter, performing composition adjustment system (CAS)/relative humidity (RH) refining treatment, continuously casting, and performing hot loading and hot feeding; performing rough rolling, performing precision rolling, performing laminar cooling, and reeling; unreeling, performing acid washing, performing continuous cold rolling, and reeling; and unreeling, washing, continuously annealing, smoothing, and reeling. The method is characterized in that: the cold-rolling low-carbon aluminum killed steel which has the width of 750 to 1,580 mm, the thickness of 0.25 to 2.5 mm and the uniform through plate property is produced by a 2,250 mm or 1,580 mm continuous hot rolling machine set, a 1,700 mm acid rolling machine set and a 1,700 mm continuous annealing machine set. A trace amount of B is added into the low-carbon aluminum killed steel to appropriately improve finish rolling temperatures and appropriately reduce rolling process parameters such as reeling temperatures, annealing temperatures and the like, so that thick boron nitride (BN) is fully separated out; and thin dispersed aluminum nitride (AlN) is effectively prevented from being separated out, so that the uniformity of the through plate mechanical property of the cold-rolling low-carbon aluminum killed steel is improved.

The invention discloses a method for recycling valuable elements from vanadium-titanium magnetite ore, which comprises the following steps of: crushing the ore or concentrate, adding sodium salt, performing oxidizing roasting, converting vanadium and chromium into water-soluble sodium vanadate and sodium chromate, performing water leaching in solution, and separating the vanadium and chromium from the solution to obtain vanadium pentoxide and chromium sesquioxide products; and adding coal dust into the leached residue for pelletizing, reducing in a rotary hearth furnace, magnetically separating iron and titanium, using the obtained magnetic iron powder as a raw material for powder metallurgy or steelmaking, and using a nonmagnetic product containing more than 50 percent of TiO2 as a raw material for extracting the titanium; or reducing iron from the leached residue in an electric furnace, using the obtained molten iron as a raw material for steelmaking and using electric furnace slag containing more than 50 percent of TiO2 as a raw material for extracting the titanium. The method is short in process flow and economical; and the recovery rate of the vanadium, chromium, titanium and iron is high.

The invention relates to a control method for preventing nozzle clogging in a casting process of ultra-low carbon-aluminium deoxidized molten steel, and belongs to the technical field of a steelmaking technology. The technical scheme is that a process path of molten iron desulfurization treatment, converter smelting, converter steel tapping, Rheinstahl Heraeus (RH) vacuum treatment, and continuous casting of a dual-flow slab is adopted to smelt ultra-low carbon steel, so that the castability of the ultra-low carbon-aluminium deoxidized molten steel is improved; the oxygen content of the molten steel of a converter blowing end-point, the carbon content and the temperature of the endpoint are reasonably controlled; a favorable condition is provided for RH vacuum decarburization; pouring is protected in a continuous casting manner; secondary oxidization of the molten steel is prevented by adopting blowing-argon sealing protection of a long-nozzle and a submersed nozzle; secondary oxidization of the molten steel is prevented by using an alkaline covering agent; an occluded foreign substance in the molten steel is well adsorbed; the castability of the ultra-low carbon-aluminium deoxidized molten steel is improved; the targets of no choking of the submersed nozzle and no change of the submersed nozzle in a complete multi-furnace continuous casting process are achieved. Thus, the effect on a casting blank caused by replacement of the submersed nozzle is avoided.

The invention relates to a process for continuous steelmaking from a ferriferous material. A molten pool is formed in a steel-smelting furnace at first, and carbonic material and oxygen are insufflated to form foaming slag; the ferriferous material and a fluxing agent are added into the smelting furnace to be molten and reduced, oxygen is insufflated into the molten steel so as to reduce the carbon content in the molten steel, the temperature of the molten steel is risen, and the molten steel is stirred with the generated CO gas; high temperature oxygen or oxygen-enriched air is insufflated and burns with CO gas generated in the smelting furnace; and the molten steel continuously flows into an oxygen blowing furnace through a siphon nozzle, and a small quantity of the fluxing agent is added into the oxygen blowing furnace so that slag formation, desulfurization and dephosphorization are performed, the C content and the temperature in the molten steel are further adjusted through blowing oxygen by an insertion oxygen lance, therefore, the obtained molten steel is directly supplied for an LF refining furnace or an RH refining furnace. The invention has the advantages that the productivity equipment including a suspended pre-reduction furnace, the smelting furnace and the oxygen blowing furnace, the investment for devices and capital construction is saved, the land is saved, the physical distribution is simplified, and the continuous production and the automatic control are facilitated.