Abstract: A cold hearth for an electroslag refining crucible includes a floor above which a melt pools. The floor includes a drain for draining the melt by gravity. A plug is deployed inside the drain to block discharge of the melt therethrough, and an actuator is attached to the plug for withdrawing the plug from the drain to permit drainage of the melt upon startup.

Abstract: An inductor is used to generate an electromagnetic AC field at a pipe-in-pipe discharge element of a metallurgical vessel. The inductor has at least two cooling fluid regions for the flow of cooling fluid therethrough. First supply and drain lines are connected to a first of the cooling fluid regions for supplying the first cooling fluid thereto. Second supply and drain lines are connected to a second region. The second cooling fluid is different than the first cooling fluid so that separate regions can be separately cooled with different cooling fluids having different properties.

Abstract: An inductively heated drain tube fashioned of high temperature, electrically conducting materials is disclosed. An inductor surrounds the drain tube. The inductor and drain tube are cast within a refractory material. The drain tube is then placed in communication with the side of a bath of molten materials. When power is supplied to the inductor, the inductor couples with the drain tube, heating the drain tube and allowing it to act as a drain for high temperature molten materials. When power is removed from the inductor, a flow of cooling liquid through the inductor cools the drain tube, solidifying the molten materials and stopping their flow through the drain tube. The refractory material encases the inductor, acting as a thermal barrier and preventing damage from molten materials.

Abstract: Molten matter is discharged from a cold crucible induction melting furnace provided with a furnace body disposed within a high-frequency coil for heating the furnace body. A metallic discharging nozzle extends downwardly from an inner bottom portion of the furnace body and can be electrically insulated from the furnace body. A high-frequency coil for heating the discharging nozzle is disposed around the nozzle. An electric circuit for removing high-frequency noise generated from the high-frequency coil for heating the furnace body is disposed in the high-frequency coil for heating the nozzle. High reliability and high controllability can be achieved without electric short-circuits between the furnace body and the nozzle and noise interference between the high-frequency coils.

Abstract: A cooling water conduit extending through a segment of a crucible is curved inward in the portion around a molten metal tapping hole.

Abstract: A heating machine for heating an ingot of a metal such as a magnesium alloy. The heating machine has a heating chamber equipped with a RF induction coil capable of swinging about a horizontally axis. The coil is placed horizontally, and the metal ingot is fed into the coil from an introduction chamber by a pushrod. Stoppers prevent the ingot from falling from the RF induction coil when it is switched from its horizontal posture to its vertical posture. The coil is wound on a cylindrical member. A rotatable hollow shaft is firmly mounted to the holder in a perpendicular relation to a substantially axially central portion of the cylindrical member. A part of the coil is inserted in the hollow shaft via an insulating material. The rotatable hollow shaft is swung by a swinging mechanism. The induction heating coil is wound on a ceramic holder. A metal ingot is inserted in the holder with a given clearance.

Abstract: A melt guide is provided for enclosing a bottom of an electroslag refining crucible containing a melt of electroslag refined metal. A base plate is sized to have a perimeter to engage the crucible bottom for attachment thereto. The base plate includes an upper surface for defining with the crucible a reservoir for receiving the melt, and a lower surface spaced therebelow. A central drain extends through the base plate for draining by gravity the melt from the reservoir. A plurality of circumferentially spaced apart slots extend radially outwardly from the drain toward the base plate perimeter and extend vertically through the base plate. Induction heating coils are mounted below the base plate lower surface for heating the melt through the slots. The base plate may take various forms including a flat plate, with or without a cooperating and removable insert.

Abstract: A process for melting an electroconductive material (1) in a melting furnace (10) by induction in a cold crucible includes electromagnetically confining a mass of the electroconductive material (1) up to its melting temperature. Then, at least one vortex is created in the liquid material to inclusion particles contained in the liquid electroconductive material. The vortex or vortices are created by electromagnetic stirring. A part of the mass of the liquid electroconductive material (1) is poured in a pouring tube (15) disposed under the melting furnace (10), subjecting the jet of the pouring of the liquid electroconductive material (1) to a radial electromagnetic confinement, and ensuring a vertical coaxial alignment of the electromagnetic fields acting on the mass of liquid electroconductive material (1) and on the pouring jet of the mass. An induction melting furnace employing a cold crucible for carrying out this is also disclosed.

Abstract: A furnace in the invention includes an induction melting furnace housed in an air-tight container which can be pressurized to the desired level of maximum allowable pressure and can be vacuum evacuated to a desired level of pressure; a vacuum melting furnace cover having a vacuum evacuating pipe; and a pressure pouring furnace cover, which has a pressure piping to impress the pouring pressure controlled by a pouring pressure control device onto the inside of the furnace and has a pouring siphon, which has its lower end opened to the bottom part within the induction melting furnace and has its upper end connected to a pouring chamber having a pouring nozzle, penetrated therethrough.

Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In the method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products.

Abstract: In a melting crucible (3) a central bottom portion (27) is formed of a plurality of palisades (5) and is shaped so that the palisades together form a vessel or a pot (7) having a centrally disposed spout or outlet (8). Two independently powered induction coils (10, 11) are provided, one coil (10) externally surrounding the collar or upper part of the central bottom portion (27), and the other coil (11) externally surrounding the spout (8). The palisades (5) are separated from one another by individual gaps (6) running radially outwardly from the center, while the electromagnetic field of at least the upper coil (10) acts on the charge contained in the melting crucible through the gaps (6).

Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products.

Abstract: An induction furnace with a crucible having a crucible axis, an induction coil and a furnace body containing a gas-tight jacket, and also with a cover which can be placed on the furnace body and has at least one gas connection, a charging valve and a pouring apparatus, the furnace body and cover being joined together releasably but hermetically by a flange connection, and being journaled in the joined state in a furnace frame by a tilting mechanism which engages the cover, and after the flange connection is separated the cover body can be removed from the furnace body which remains in the furnace frame.

Abstract: A crucible 1 of an induction melting apparatus has a cover 3 closing the crucible off hermetically and having a connection 5 for attaching the cover to a vacuum source 6. At the bottom the crucible 1 has a prolongation 7 in which a mold 9 is sealingly disposed. Thus, the mold 9 is evacuated together with the crucible 1 so that a vacuum chamber enveloping the crucible 1 and the mold (9) is unnecessary.

Abstract: Furnace for the continuous melting of mixtures of oxides by direct induction at high frequency and a very short refining time and with a low energy consumption, comprising an intake (14) and a nozzle (15) for the continuous discharge of oxides into a metal crucible (3) having cold walls heated by a high frequency coil (5), characterized in that the height of the oxide bath is between 2 cm and 20% of the diameter of the metal crucible and in that the furnace hearth (4) is both transparent to the inducing magnetic field and sufficiently cooled to ensure the formation and maintenance of a protective solid crust at the bottom of the crucible.

Abstract: A crucible (9) surrounded by an induction coil (10) is housed for tilting about a first tilt axis within a gas-tight furnace chamber (2) which has a closable opening (40a) for transferring the melt (31) into a receiving vessel (36, 63). The furnace chamber (2) is in turn tiltable about a second tilt axis (A2) between a melting position and a position in which the start of the pouring of the melt is immediately imminent by an angle which corresponds to the range of the tilting angle of the crucible (9). The opening (40a) for transferring the melt is surrounded by a first sealing flange (41) which, after the tilting path of the furnace chamber (2) has been traveled, comes sealingly into contact with a second sealing flange (38, 64) of an additional gas-tight chamber (35, 61) in which the receiving vessel (36, 63) for the melt is situated.

Abstract: The furnace for melting materials with a low melting point with improved casting duct comprises a furnace body which surrounds a crucible for containing the molten material and which is provided with first resistors for heating the crucible, the casting duct having an inlet arranged above the level of the free surface of the molten material in the crucible and being fed by a ladle for removing molten material, the casting duct being further provided with second resistors for heating thereof in order to prevent accidental cooling of the molten material along the duct.

Abstract: A method and apparatus for forming a stream of molten material. The apparatus includes a melt container having a bottom wall in which is formed an aperture. A funnel is adapted and constructed to receive molten material from the aperture in the container, and includes a plurality of fluid-cooled metallic segments. The funnel segments define an inner funnel contour that decreases in cross-sectional area from the inlet end to the outlet end of the funnel. An electrically conductive coil surrounds the funnel, and has a shape corresponding to the outer shape of said funnel. A source of medium-frequency current in selective electrical connection with the coil. The method begins with the step of providing a predetermined quantity of molten material in a melt container. A metallic funnel is provided in fluid communication with the melt container, and includes a plurality of fluid-cooled funnel segments. The method also includes the step of providing an electrically conductive coil surrounding the funnel.

Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In the method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products.

Abstract: An induction furnace (1) for melting and casting purposes has a closed crucible pot (2) with a pot bottom (3) and a cover (4), a crucible (6) housed in the crucible pot and surrounded by an induction coil (7), and an ascending tube (9) reaching into the crucible, through which the crucible can be emptied into a casting apparatus by means of gas pressure. To permit continuous operation and measurements and analyses during operation, the ascending tube (9) is fastened exclusively to the pot bottom (3) and connected with a horizontal delivery tube (11) which is brought through a side wall of the pot bottom (3). Furthermore, above a separation seam (24) between pot bottom (3) and cover (4) a turret (39) with a vertical axis of rotation is disposed, which has a charging air lock (26) for charging the crucible (6) with melt material (27) and a measuring chamber (36). The charging air lock and measuring chamber can be connected alternately with an air lock valve (25) which is disposed on the top of the cover (4).

Abstract: A melting apparatus in which a material to be melted is accommodated in a crucible made of platinum or its alloy, and electric current passes through the crucible to generate heat ot melt the material. At least a part of the crucible is formed into a double-wall structure having inner and outer peripheral walls. The electric current is caused to pass through the double-wall structure to generate the heat.

Abstract: The invention relates to an induction melting furnace 1 for metals which are difficult to melt including an induction coil 2 surrounding the crucible 3 and a mold receptacle 4 surrounded by an annular chamber 5 to hold the cooling agent. The crucible 3 is disposed in a housing 7 provided with a vacuum connection 6. In order to improve the microporous nature, the melt contained in the mold receptacle 4 is compressed by means of a pressure which is build up in the mold receptacle 4 prior to the cooling.

Abstract: The present invention relates to a cold crucible adapted to be discharged through the bottom. The crucible consists of a conductive wall consisting of a plurality of longitudinal hollow segments which are electrically insulated at least partially from one another and which are by virtue of the longitudinal hollows adapted to be traversed internally by a cooling fluid and which crucible is adapted to be placed inside an inductor and in which the wall is provided in its bottom part with an aperture inside which there is a removable occluding member, formed of segments which member is cooled like the wall of the crucible. The crucible is used in the processing of materials of high purity which can be recovered in the liquid state in a convenient complete and rapid manner.

Abstract: The invention relates to an apparatus for the regeneration of active carbon comprising particularly:a hopper for introducing the active carbon;a reactor (7) delimited by an elongated shaped sheath;a continuous Archimedes screw (10) situated inside the reactor to transport the active carbon to be regenerated;structure for heating by resistances (8), arranged inside the sheath of the reactor;structure situated above the unload end of the reactor (19) and in communication with the reactor, particularly for removing the gases;a coffer into which the Arichmedes screw unloads;structure for communication with the reactor and situated on the one hand close to the input of the reactor and on the other hand along the reactor to regulate the pressure inside the reactor and to inject steam.This apparatus for regenerating active carbon enables the powder active carbon to be regenerated efficiently.

Abstract: A packaging system for an induction furnace has an equipment housing within which is located all the operating equipment for the furnace. The equipment is centrally located within the housing and is reached by access panels in the housing cover, which forms a deck. The operating equipment is fully enclosed and protected by the housing, yet can be easily reached by means of the access panels for maintenance, troubleshooting and the like.

Abstract: A packaging system for an induction furnace has an equipment housing within which is located all the operating equipment for the furnace. The equipment is centrally located within the housing and is reached from either side by access panels in the housing cover, which forms a deck. The operating equipment is fully enclosed and protected by the housing, yet can be easily reached by means of the access panels for maintenance, trouble shooting and the like.

Abstract: An apparatus for processing bulk materials by induction wherein the materials are processed within a plurality of compartments whose walls comprise a material which is adaptable to being heated by induction and wherein the plurality of compartments commonly share an induction coil means which surrounds the plurality of compartments. The apparatus possesses features which make it adaptable to operate in a closed system to be acceptable to the environment and also features which guarantee uniform charging of the material to be processed and uniform discharging of the processed material. In applications where sulfur, tars and oils are a problem, means are provided to deal with such problems by reacting the sulfur and by cracking the tars and oils. The apparatus lends itself to economically process tonnages of great magnitude at a low operating cost and also it requires low investment cost.

Abstract: A method for continuously pouring molten metal in an initially substantially unfilled tundish having a channel-type inductor having a channel opening into the bottom portion of the tundish, is done by starting the pourings and the continuous sequential steps of applying power to the inductor when its channel is first covered by the poured metal to form a melt level and the static pressure of the metal is low and while increasing the power rapidly so as to cause incipient pinching in the channel and then momentarily rapidly reducing the power so as to prevent pinching; as the metal level further increases so that the metal's static pressure further increases, again increasing the power rapidly so as to again cause incipient pinching in the channel and then again momentarily rapidly reducing the power so as to prevent pinching; and continuing these sequential steps until the tundish is filled.

Abstract: A feed chain mechanism for continuously feeding metal bars through an induction furnace has a pair of laterally spaced feed chains. Each feed chain includes a plurality of links with alternate links being formed from stainless steel and ceramic material, respectively. The stainless steel links are disposed in pairs and form a drive slot. The stainless steel links on one of said feed chains is laterally opposite the ceramic links on the other feed chain to prevent the creation of a continuous loop for conducting electrical current in adjacent metal bars which are laterally spanning the chains. The feed chains are driven by cogwheels which mesh with the drive slot formed between the stainless steel links.

Abstract: A furnace comprises a crucible surrounded by an induction heating coil and having a filling mouth and a pouring spout. The crucible is cylindrical in shape having an oval external cross-sectional profile with a major diameter and a minor diameter, and an internal profile of substantially constant diameter. In the portions of the crucible wall of greater thickness are formed a filling duct and a pouring duct which connect the filling mouth and the pouring spout respectively to the bottom of the crucible.

Abstract: An arrangement for controlling the pouring of a melt out of a crucible with a hole in the bottom which hole is blocked while the material is being melted with a closure plate that melts through locally as the result of heat transferred from the melt. To precisely establish the time at which the closure plate melts through, the plate is cooled from below while the starting material is being melted. Cooling is at least decreased and preferably terminated when it is time to pour out the melt. The plate can be cooled by a flow of a gas coolant directed against it or by contact with a cooling element that is raised into position against it from below.

Abstract: An automated sample analyzer for induction furnace analysis includes an induction furnace having an induction coil housing with an induction coil therein. The coil housing has a lower opening through which a crucible with a sample can be moved to allow the sample to be analyzed by burning. An elevator is provided for raising and lowering a crucible to and from the induction coil through the lower opening and includes a cover for covering the lower opening. A rotatable and radially movable tray has crucible openings for holding a series of crucibles. The tray openings also radially receive the elevator allowing the tray to move out of the way of the cover as it moves with the elevator while the elevator holds a crucible. A drive is provided for moving the tray rotationally and radially in a series of steps such that the crucible receptacle openings are sequentially moved to and from the elevator for automated loading and unloading of the crucibles on the elevator.

Abstract: The device includes a chamber for holding a metal in the liquid state having a lower section that communicates with three channels which converge to form a single passage wherein two of the channels include inductor cores around which the channel forms an annular zone to contain the metal. In the presence of alternating currents of variable voltage and phase, the inductors can be energized separately or simultaneously to perform the heating, mixing and transferring operations within the channels.

Abstract: Induction crucible furnace for maintaining or increasing the temperature level of a metal melt, characterized by the feature that the inlet of the melt to the crucible furnace is arranged below the bath level in the furnace.

Abstract: A crucible used with a precision casting device, especially used for dental purposes, which is vertically or axially divided into a plurality of segments, these segments being held together to form a complete crucible during heating and melting steps and readily released to discharge the contents downwards during casting step.