5588 results about "Melting furnace" patented technology

Molten iron is prepared by (1) providing iron oxide and a carbonaceous reducing agent, (2) preparing a shaped product from the carbonaceous reducing agent and the iron oxide, (3) preparing solid reduced iron from the shaped product, wherein the solid reduced iron has a metallization of at least 60%, a specific gravity of at least 1.7, and a carbon content of at least 50% of the theoretical amount required for reducing the iron oxide remaining in the solid reduced iron, and, (4) before substantial cooling occurs, heating the solid reduced iron in an arc heating-type melting furnace at a high temperature. The molten iron can be prepared efficiently from iron ores of relatively low iron content without causing erosion of refractories, at high energy and high reduction efficiencies, and by a simple operation in a simple facility.

An apparatus for transferring molten metal from a melting furnace to a casting furnace is provided. A sensing and control system for the transfer of molten metal from a transfer furnace to a casting furnace is also described. The combination of the transfer apparatus with the sensing and control system provides for the introduction of reduced oxide molten metal into a casting furnace.

A method of forming a glass melt including heating a glass feed material in a first melting furnace to form a glass melt, flowing the glass melt into a second melting furnace through a refractory metal connecting tube, and further heating the glass melt in the second melting furnace. The refractory metal connecting tube is heated to prevent the molten glass from excessive cooling, and to ensure that the glass melt entering the second melting furnace is equal to or greater than the temperature of the glass melt in the second melting furnace. An apparatus for performing the method is also disclosed.

This invention relates to a glass melting furnace with downward firing oxygen-fuel burners placed in the breast walls of the combustion space and adjacent to the skew block. The downward firing oxygen-fuel burner may be placed at an angle so that the oxygen-fuel flame from the downward firing oxygen-fuel burner impinges on the upper surface of the glass bath. The placement and angle of the downward firing oxygen-fuel burner may maximize the amount of heat transferred to the batch cover or the molten glass, ensure the formation of high quality glass products, and protect the integrity of the downward firing oxygen-fuel burners and the glass melting furnace.

The invention provides a melting furnace slag quenching dry type granulation and sensible heat recovery generating system and a method using the same and belongs to the technical field of steel metallurgy furnace slag treatment and complementary energy recovery. The melting furnace slag quenching dry type granulation and sensible heat recovery generating system provided by the invention comprisesa slag-receiving device, a high-pressure water-air pulverization furnace slag quenching and granulating device, a furnace slag slow-cooling device, a sensible heat recovery generating device and a waste gas purification treatment device. According to the invention, the melting furnace slag is quenched and granulated by utilizing the high-pressure water-air pulverization device, so that the melting furnace slag is rapidly cooled to be in a glassy state; and then through a water-cooled type vibration grid plate, the melting furnace slag in the glassy state is further subjected to heat exchange with cold air so as to facilitate the subsequent recovery of the sensible heat. By the system provided by the invention, the melting furnace slag is quenched and granulated, and the high-temperature sensible heat resource of the furnace slag is sufficiently recovered and is used for generation on the basis that the water activity quality of the furnace slag is not influenced.

The invention discloses a continuous casting process of an aluminum thin billet, which is characterized in that the following steps are included: aluminum alloy ingots are preheated and are melted in a melting furnace in the role of a flux; before casting, a side closure system is preheated to 400-450 DEG C, when the temperature of a melting body ranges from 650 DEG C to 680 DEG C, the aluminum alloy ingots are arranged into a tundish for 15 to 30 minutes in the role of the flux, then through a flux distributing device, the aluminum alloy ingots flow into an equant vertical twin-roll thin strip billet continuous caster, with a left forging seam gap being 0 mm and maintaining the height of a melting pool between 90 mm and 340 mm, the casting is carried out in a sinking way; when in casting, the casting speed of the casting machine ranges from 20 to 120m / min, the thin strip blank is sent into a pinch roll after leaving a casting roller, and the forged aluminum alloy thin strip has a thickness between 1.0 mm and 3.5 mm. The continuous casting process can directly make aluminum alloy thin strip blank from the liquid aluminum alloy, the forged thin strip blank has good quality on the surface, and the internal organizational structure is uniform, thereby being conducive to succeeding rolling processes. The continuous casting process for an aluminum thin blank has short process and low cost.

A kind of alloy, which is anti-squirming, and the components of it and the weight percent of them is: 1.5-10%Y, 0.15-2.0%Zr, 0.3-2.0%Nd, 2.5-8%Gd, and one kind or several kinds of components among Sm, Dy, Tb, Ho, Er, Tm and Eu is also contained, the other is Mg. the following steps are contained in the method: (1) To prepare material (2) To improve the temperature of warm-up stove and melting stove (3) To warm up the material (4) To melt the purified magnesium ingots in batches (5) To melt the other materials, which has been warmed up, in the Mg solution. (6) To distribute equably the alloy components in the Mg solution. (7) To make into casting ingot, cast, billet, board material, pipe material, model material, stick material, line material and all kinds of forged piece. The Mg alloy can fulfill the need owing a higher mechanics performance and anti-squirming performance under high temperate, and the anti-causticity performance is higher than the Mg in existence.

A composition for the manufacture of high strength glass fibers suitable for manufacture in a refractory lined glass melter is disclosed. The glass composition of the present invention includes 64-75 weight % SiO2, 16-24 weight % Al2O3, 8-11 weight % MgO and 0.25 to 3.0 weight % R2O where R2O is the sum of Li2O and Na2O. A composition of the present invention includes 64-75 weight % SiO2, 16-24 weight % Al2O3, 8-11 weight % MgO and 0.25 to 3.0 weight % Li2O. Another composition includes 68-69 weight percent SiO2, 20-22 weight percent Al2O3, 9-10 weight percent MgO and 1-3 weight percent Li2O. By using oxide based refractory lined furnaces the cost of production of glass fibers is substantially reduced in comparison with the cost of fibers using a platinum lined melting furnace. Fibers formed by the present invention are also disclosed. The fibers have a fiberizing temperature of less than 2650° F., a ΔT of at least 80° F. Further, the glass fibers have a strength in excess of 680 KPSI, in some instances a strength in excess of about 700 KPSI, and in others a strength in excess of about 730 KPSI. The glass fibers will desirably have a modulus greater than 12.0 MPSI, in some instances greater than about 12.18 MPSI, and in certain instances greater than about 12.7 MPSI.

A method and apparatus for simultaneously supplying varying proportions of hot and cold direct reduced iron(DRI) material from a source of hot DRI for melting, storage, briquetting, or transport. The system uses gravity to transport hot DRI material from a reduction furnace to a furnace discharge section, which transports desired amounts to a cooling receptacle and to a hot DRI vessel. The cooling section of the apparatus is connected to the furnace discharge section through a dynamic seal leg. The hot section is also connected to the furnace discharge section through separate a dynamic sealing leg and can feed a surge vessel, a briquetter, a storage vessel or a melting furnace. The method of operation is also disclosed.

The invention discloses a three-dimensional (3D) metal printer. A printing head integrating a ceramic melting furnace and a liquid metal ejector is a key technology for the 3D metal printer. The printing head is made of high temperature resistant ceramic or graphite material, a water cooling eddy current coil is installed on an outer layer, the melting furnace is filled with inert gas to protect liquid metal, and the ejector is a reciprocating type plunger pump. The water cooling eddy current coil is electrified with high-frequency current, and heating power can be adjusted through a high-frequency controller according to factors such as material types, model requirements and processing speeds. The inert gas keeps a certain pressure while protecting the molten metal, flow of the liquid metal is facilitated, and metal residue in the plunger pump and the melting furnace is removed by means of gas simultaneously during shutdown. Besides application to the 3D metal printer, the printing head can also be used for devices for die-cast molding and injection molding of metal material and the like.

The invention relates to a method for producing rock wool, which comprises the following steps: 1) selecting slag as a principle raw material, adding basalt or silica, and melting in a melting furnace; 2) under the action of a centrifugal machine, drawing the melted materials into fibers, utilizing high-pressure air to blow the fibers into a wool collecting machine, separating out slag balls during a blowing process, and meanwhile, applying a binder onto the surfaces of the fibers; 3) forming the fibers into a primary wool layer under the action of the wool collecting machine, conveying the primary wool layer to a conveyer under the action of a pendulum bob machine, and forming a wool felt of a multilayer folding structure on a conveying belt of the conveyer; 4) preparing the wool felt into structural wool under the action of a pressing pleating machine; and 5) feeding the structural wool into a curing furnace for pressing and forming, and meanwhile, blowing 220-300 DEG C hot air, and curing a water-soluble phenolic resin solution which is used as a binder. The rock wool produced according to the method has the advantage of high compression strength. The method provided by the invention belongs to the field of the manufacturing of an inorganic nonmetallic material.

The invention discloses an iron-making method by performing coal-based direct reduction in a rotary hearth furnace and melting in a gas melting furnace on lateritic-nickel ore. The method comprises the following steps: firstly mixing a certain quantity of coal, lateritic-nickel ore and a fluxing agent and then pelletizing, spreading green pellets in a rotary hearth furnace after the pellets are dried, and heating to the temperature of 1200-1300 DEG C and maintaining the temperature for 30-40 minutes to obtain high-temperature metallized pellets; hot-packing the high-temperature metallized pellets at 600-1100 DEG C from the rotary hearth furnace, and then transferring the packed pellets into a heat-accumulating gas melting furnace for melting at the temperature of 1420-1500 DEG C for 30 minutes, wherein the heat-accumulating gas melting furnace utilizes coal gas as fuel; and removing slag to finally obtain high-nickel ferronickel alloy. The iron-making method has the advantages of simple process, short flow, high efficiency, high nickel recovery rate and no need of coking coal and is applicable to the treatment of lateritic-nickel ore.

The invention relates to a method for smelting a nickel-based high temperature alloy in a vacuum induction furnace. The method sequentially comprises the following steps of: I, putting alloy raw materials into the furnace in a ratio; II, closing a furnace cover, vacuumizing, and performing power transmission to melt furnace burden; III, melting at the speed of less than or equal to 1 / 2 maximum furnace capacity / hour; IV, after the furnace burden is completely melted, starting performing bottom argon blowing, and refining for 20 to 25 minutes; V, stopping argon blowing, adding Al and Ti, and alloying; VI, after Al and Ti are completely melted, performing bottom argon blowing, and refining; VII, after refining is finished, closing a vacuum pump, and filling argon into the furnace and an ingot mold; VIII, alloying at the finishing point, namely adding B, Zr and a rare earth element, and adding a Ni-Mg alloy; and IX, performing electrified tapping after 3 to 4 minutes, and casting into an alloy ingot. By the method for smelting the nickel-based high temperature alloy in the vacuum induction furnace, refining time is 35 to 40 minutes, and the nickel-based high temperature alloy with very low carbon content can be obtained.

The invention discloses a method for preparing alloy powder, more particularly relates to a method for continuously preparing high-quality tin alloy welding powder. The invention is characterized in that an atomizing chamber is vacuumed, then inert protection gas is filled into the atomizing chamber; the tin alloy material is melted in a melting furnace, and then is controlled to be atomized in the atomizing chamber; after being cooled, the tin alloy material is solidified into tin alloy powder grain; by the sieving of the equipment, the needed product is obtained; products not meeting the requirements is melted and prepared again. The invention has the advantage that the quality of tin alloy powder is greatly improved by optimizing producing condition; the surface chemical property is improved; the productive labor cost can be greatly lowered; high priority is given to environmental protection in the process of realizing a circular production process. Products prepared by the method can be widely applied to encapsulation and circuit board welding material in electronic industry.

The invention provides a method and a device for disassembling electronic components from waste printed circuit boards (PCB) and recovering soldering tin. The method comprises the following steps: placing the PCB with the electronic components in a temperature-setting tin-melting furnace in a manner that the PCB faces up; grabbing larger electronic components manually and feeding the PCB containing smaller electronic components and soldering tin to the conveyor belt after the soldering tin is melted by heat, wherein, an automatic-control electrical heating and warming device is additionally arranged at the bottom of the conveyor belt; pinning down the PCB by a hob and forwarding the PCB, and eliminating the electronic components and the soldering tin by a scraper arranged on the rear side of the hob, so that the soldering tin can be separated from the electronic components on the PCB through the successive coordinating operation of hobs and scrapers in a plurality of groups; recovering the soldering tin by a material-receiving pot; and subjecting the peculiar smell and harmful gases generated by heating the PCB to negative-pressure air draft and absorption treatment and discharging the gases until the discharge standards are met. The invention is suitable for treating PCBs with various thicknesses and recovering electronic components of various types and models; the invention has the advantages of high speed, high efficiency, no pollution, high operability and advanced technology; and the invention contains a novel and environment-friendly method and an equipment for disassembling the waste printed circuit boards and recovering treatment of soldering tin.

The invention relates to an electromagnetic stirring and vibration combined device for preparing semi-solid slurry of a black metal. The device comprises three main sections: a melting furnace, a stirring chamber, and a crystallizer or a rheologic conveyor, wherein the melting furnace is arranged at the upper part of the stirring chamber, and the crystallizer or the rheologic conveyor is arranged at the lower part of the stirring chamber. When molten metal is poured into the melting furnace, a medium-frequency induction heater is used for maintaining temperature and uniformly heating; when the temperature of the molten metal is within the liquidus temperature range, the molten metal is poured into a stirring crucible in a quantitative amount, and a non-dendritic fine equiaxial spherical or nearly spherical microstructure is obtained by electromagnetically stirring and mechanically vibrating the molten metal; and the prepared fine nearly spherical semi-solid slurry is poured into the crystallizer, then cooled and solidified into a blank, or the slurry is poured into the rheologic conveyor and then is rapidly conveyed to a forming mold for rheoforming. The device can be used for preparing semi-solid slurry of a black metal and nonferrous metal, which improves the efficiency and the quality for preparing metal semi-solid slurry and shortens the preparation time. The device is especially suitable for rheoforming.

The invention discloses a technique for comprehensively utilizing iron-containing dust mud, which is characterized by comprising the following steps: preparing iron-containing dust mud into blocks or balls by block pressing, ball pressing or balling, drying the ball or blocky red mud, adding the red mud into a rotary hearth furnace, carrying out ZnO removal, alkali metal removal and FeOx pre-reduction on the dust mud in the rotary hearth furnace technique, recovering ZnO from rotary hearth furnace flue gas, and pre-reducing to obtain the metalized pellet DRI; and adding the DRI generated from the rotary hearth furnace into a melting furnace to perform slag-iron separation, sending the separated molten iron into a steelmaking technique, and carrying out concurrent heating hardening and tempering on the dust mud molten slag separated from the metal, wherein the product can be used for producing cement, mineral wool, microcrystalline glass or other high-added-value silicate products. Thus, the technique enhances the comprehensive utilization efficiency of the whole iron-containing dust mud, and enhances the comprehensive utilization economic benefit of the iron-containing dust mud.

A method and apparatus are provided for reducing the VOC, CO, and, alternatively, the NOx content of dryer offgas that is discharged into the atmosphere from a moist organic product drying process using thermal oxidizing apparatus that includes a burner, furnace, mixing chamber, thermal oxidizer, tempering chamber, and an indirect gas-to-gas heat exchanger. The dryer offgas is separated into two portions, with a larger portion being preheated by indirect heat exchange with the hot gaseous output from the thermal oxidizer. The non-preheated portion is directed to the burner in the function of flue gas recycle for NOx control. The preheated portion is separated into two portions, with one portion being directed to the furnace / mixing chamber of the thermal oxidizing apparatus. The other portion of the preheated offgas is recycled to the hot gas inlet of the dryer and serves the function of dryer heat transfer media. Ultimately, all the dryer offgas enters the thermal oxidizer, and comprises a smaller non-preheated portion directed to the burner and a larger preheated portion directed to the furnace / mixing chamber. By preheating a large proportion of the offgas directed to the thermal oxidizing apparatus, simultaneous achievement of an adequate thermal oxidizer temperature, 1600° F., and an adequate oxygen concentration of 5% by volume is achieved for optimized thermal oxidation of carbon monoxide and volatile organic compounds.

The invention provides an ultrawhite calendering glass kiln. The kiln is characterized in that: the kiln comprises a melting furnace, a main channel, a lateral channel, and a plurality of branch channels, which are sequentially communicated; and the main channel is a cylinder channel which has a round / quadrate / rectangular / trumpet-like shape, and each corner of each channel is provided with a transition surface. According to the invention, passage sections of the main channel are improved, and simultaneously the corners of all channels are provided with the transition surfaces, so a function of one kiln corresponds to multiple lines is realized, rapid changes of the velocity and the flow of a glass melt caused by a sudden change of a channel area while the glass melt enters another channel when going through the main channel are retarded or reduced, and long-time eddy and scour of the glass melt on the corner can be avoided, thereby a lateral temperature difference generated in a process that the glass melt flows from the outlet of the melting furnace to overflow ports of the branch channels can be reduced or avoided, and the production quality and the quality stability are improved.

The invention relates to treatment technique for electroplated sludge, which comprises following steps: a. matching material by dried sludge, solvent and coke according to the weight proportion as 100:15~71:50~88; b. mixing the material evenly to put into melting furnace with temperature 1400~1600Deg for reducing melting, releasing the reduced nickel-copper alloy through ally output and liquid residue through slag hole; c. treating residue gas and discharging out. This method has well speed and high recovery ratio, and overcomes problems brought by slag.

The invention discloses a high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire and a production method of the high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire. The high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire is produced by finely selecting ingredients and contents of aluminum alloy and conducting process control. The specific steps are as follows: selecting Fe, Si, Mg, Cu and Re with different weight percents, melting aluminum ingot with the content not more than 0.03% in a vertical melting furnace, adding alloying elements in a heat insulation furnace, stirring, refining, conducting on-the-spot contents rapid analysis, carrying out content adjustment, and standing, enabling the aluminum ingot and the alloying element into a continuous casting machine for casting, rolling to be a circular aluminum alloy rod on a continuous rolling machine, pulling the circular aluminum alloy rod to be a circular aluminum alloy wire and twisting the circular aluminum alloy wire to be a conductor for aerial power transmission and distribution. According to the application of the aluminum alloy wire and the production method of the aluminum alloy wire, the aluminum alloy wire directly replaces the generally used aluminum conductor steel reinforced and is an energy-saving, environment-friendly and novel wire.

The invention discloses a Ti-based powder preparing device and a Ti-based powder preparing method. The device comprises a vacuum chamber, a magnetic suspension melting furnace, an atomization power processing chamber and a screening system. During working, when the magnetic suspension melting furnace is energized with high frequency alternating current, a high frequency alternating magnetic field can be produced in space around a coil, and the high frequency alternating magnetic field causes induction vortex in furnace charge. The induction vortex and the external alternating magnetic field interact with each other to produce suspension force for the furnace charge, and the suspension force is balanced with the dead weight of the furnace charge so as to enable the furnace charge to suspend; meanwhile, a vortex circuit generates a great deal of heat to melt the furnace charge, and the molten mass is subjected to deslagging, degassing and purification under the fierce function of electromagnetic stirring. The purified molten mass can fall into a gas atomization chamber by virtue of controlling the magnetic field; under the functions of a supersonic speed high-pressure argon atomizer and a cooling device, the molten mass is atomized into spherical Ti-based powder with high degree of sphericity, oxygen content of less than 1800 ppm and nitrogen content of less than 300 ppm.

The invention relates to a solid organic waste gasification and melting cycle-treatment process, which comprises steps of crushing, anhydration, moulding, gasification and melting. A gasification product is mainly combustible gas and pyrolytic carbon, and the pyrolytic carbon undergoes melting treatment. The use of the combustible gas is mainly divided into two parts: most of the combustible gas is conveyed into a secondary combustion chamber to be combusted to heat an anhydration medium so as to provide energy for the anhydration phase or power an internal combustion engine; and part of the combustible gas is sent into a melting furnace and oxygen-enriched air or pure oxygen is added to melt the pyrolytic carbon, and generated flue gas is sent into the secondary combustion chamber. Tail gas generated during the phases of organic waste storage, crushing, anhydration and moulding is also sent into the secondary combustion chamber to be used as combustion air for high-temperature combustion treatment. By the technology for treatment of various solid organic wastes such as municipal domestic waste, industrial refuse, various livestock residues, sludge, straw and the like, quantitative reduction is obvious, and the technology has characteristics of energy conservation and emission reduction, low-carbon and environmental protection, less secondary pollution, high harmless degree, low operation cost and remarkable environmental benefit and the like.

An apparatus for melting an electrically conductive metallic material comprises an auxiliary ion plasma electron emitter configured to produce a focused electron field including a cross-sectional profile having a first shape. The apparatus further comprises a steering system configured to direct the focused electron field to impinge the focused electron field on at least a portion of the electrically conductive metallic material to at least one of melt or heat any solidified portions of the electrically conductive metallic material, any solid condensate within the electrically conductive metallic material, and / or regions of a solidifying ingot.

This invention relates to carbon pellets as raw materials smelting reduction ironmaking field. This invention cured composite melting reduction in carbon pellets as raw materials and coal as fuel and reducing agent eventually reinstated. By-baking furnace melting reduction, intermediate storage melt furnace, furnace and eventually reducing coal burning furnace components Cyclones circulatory system. Complex carbon pellets melt-in-baking furnace oxidation reduction carried out in an atmosphere baking heat, the ball nuclear direct reduction, iron oxide pellets outer indirect reduction and then the process of melting, and other pre-reduction. After the first hot the metal from the furnace slag into the final reduction. The final reduction furnace combustion gases into the secondary combustion furnace coal Cyclones with input by the combustion of pulverized coal-baking furnace melting reduction heating.

The process of making oil cylinder body and cover of aluminum alloy includes the following steps: heating in a smelting furnace the materials comprising Zn 1-8.0 wt%, Mg 1.0-5.0 wt%, Cu 0.8-2.5 wt%, Mn 0.2-1.0 wt%, Cr 0.1-0.3 wt% and Al for the rest; refining; casting in extruding and casting mold through fast closing mold, slowly applying pressure and maintaining pressure for the aluminum alloy to solidify and crystallize; and final solid solution ageing T6 heat treatment on the cast blank to obtain oil cylinder body and cover casting. The process has high material utilizing rate, high production efficiency and low production cost, and the product blank has light weight, compact and homogeneous structure and less faults.

The invention provides a system and a method for gasification melting of household refuse and treatment of household refuse leachate. The system comprises a household refuse pretreatment system, a refuse energy recovering system and a refuse leachate concentration and flue gas treatment system, wherein the household refuse pretreatment system comprises a household refuse stock bin, a household refuse crusher, a household refuse sieving machine and a household refuse extrusion dehydrator which are sequentially connected; the refuse energy recovering system comprises a fluidized-bed gasifier, a cyclone melting furnace, a waste heat boiler and an air-supplying and oxygen-enriching system matched with the fluidized-bed gasifier, the cyclone melting furnace and the waste heat boiler; the refuse leachate concentration and flue gas treatment system comprises a leachate concentrating system, a flue gas purifying device and a wastewater treatment device. According to the system, the heat value of the refuge is increased by a pretreatment process; an oxygen-enriching gasifier and a high-temperature cyclone melting furnace technology are used as a recovering system of refuge energy; the refuge leachate is concentrated by using medium-temperature flue gas exhausted by the waste heat boiler; the concentrated leachate is sprayed into the high-temperature cyclone furnace for harmless treatment.

The invention provides equipment and method for preparing inorganic ore slag fiber by utilizing thermal-state blast furnace slag. In the equipment, an additive melting furnace is designed. The method comprises the following steps: respectively melting the thermal-state blast furnace slag and the additive by utilizing the equipment and then evenly mixing so as to obtain a molten liquid which is evenly mixed; and making the molten liquid which is evenly mixed into silk so as to obtain the inorganic ore slag fiber. According to the invention, the method for preparing the inorganic ore slag by utilizing the novel equipment is simple and practicable and convenient for implementation, the sensible heat in a raw material is fully utilized, and the comprehensive utilization of different industrial waste materials such as thermal-state blast furnace slag and the like is realized, thereby overcoming the technical problems of fusing and evenly mixing; and the inorganic ore slag fiber having wide application and various good characteristics such as high temperature resistance, corrosion resistance, high strength, light specific gravity, good electric insulation property, low moisture absorption, small extension and the like can be prepared.

An agitator for agitating a melt includes a heat-resistive container having a blast opening through which cooling air is blown and an exhaust opening for exhausting air having been subjected to heat exchange, and a rotating magnet assembly composed of a permanent magnet housed in the heat-resistive container in a rotatable manner, magnetic lines of force emitted from the permanent magnet penetrating through the heat-resistive container to exit outside, and then penetrating the heat-resistive container again to return to the permanent magnet.