Abstract: An agitation device, a melting apparatus, and a melting method for improving melting efficiency of molten metal without contaminating the same. The agitation device is provided with a traveling magnetic field generating unit which is disposed outside a charging tank for storing molten metal and generates, inside the charging tank, a magnetic field that travels downward along the rear sidewall of the charging tank. A flow of the molten metal that rotates longitudinally about an axis approximately parallel to the surface of the molten metal is produced in the molten metal. By charging aluminum cutting chips into the molten metal in which the flow is produced, the aluminum cutting chips move with a downward flow of the molten metal, and are immersed in the molten metal. As a result, melting of the aluminum cutting chips can be accelerated.

Abstract: A method to introduce ceramic particles into the liquid metal from the polymeric precursor route by in-situ process by cross-linking organic precursor into a hard polymer, this powder is crushed, and then added to the liquid melt for in-situ pyrolysis of the organic into the ceramic phase. The starting material, the organic, for the above process can be in the form of a liquid or a solid. If it is a solid it us usually dissolved into a solvent to create a liquid form. The organic is then cross linked either directly by a thermal process, by adding a catalyst, or by the well known sol-gel process into a hard polymer. It is this hard polymer which is then pyrolyzed into the high temperature ceramic material by the process outlined above.

Abstract: An agitator for applying an alternating field to a melting furnace main body in order to melt a row material to form a melt includes a plurality of magnets, which are arranged so that magnetic lines of force emitted from one of the magnets pass through the melt in the melting furnace main body and return to another magnet, the magnets being fixed to an inclined surface which is inclined by an angle with respect to a horizontal surface, and being rotatable around an axis substantially perpendicular to the inclined surface.

Abstract: There is provided a melting furnace with an agitator. The melting furnace with an agitator includes a melting furnace that contains melt, and an agitator that agitates the melt by an electromagnetic force. The agitator includes a first electrode that is provided at an arbitrary position of the melting furnace so as to come in contact with the melt contained in the melting furnace, a second electrode that is provided near a bottom wall of the melting furnace so as to come in contact with the melt, a first magnetic field device that is provided outside the melting furnace so as to face the bottom wall of the melting furnace and makes a north pole face the bottom wall, and a second magnetic field device that is provided outside the melting furnace so as to face the bottom wall of the melting furnace and makes a south pole face the bottom wall. The first and second magnetic field devices are disposed with a gap in a certain direction.

Abstract: It is an object of the present invention to prevent oxidation during the metal melting, by suspending both heating and supply of metal material under the monitoring by measuring the oxygen concentration in the inactive gas atmosphere. A oxidation prevent method of melting metal material by a melting vessel 1 comprising inside a rotatable agitation member 8, having a weighing chamber 4 communicating with a nozzle member 2, and an injection member 9 advanceably and retractably inserting an extremity injection plunger 12 passing through the agitation member 8 in the weighing chamber 4, and the melting vessel being installed on a slant with the nozzle member 2 downside. The space area over the melted metal surface 15a of the melting vessel 1 is made into inactive gas atmosphere. The oxygen concentration in this space area is measured and monitored.

Abstract: It is an object of the present invention to prevent oxidation during the metal melting, by suspending both heating and supply of metal material under the monitoring by measuring the oxygen concentration in the inactive gas atmosphere. A oxidation prevent method of melting metal material by a melting vessel 1 comprising inside a rotatable agitation member 8,having a weighing chamber 4 communicating with a nozzle member 2, and an injection member 9 advanceably and retractably inserting an extremity injection plunger 12 passing through the agitation member 8 in the weighing chamber 4, and the melting vessel being installed on a slant with the nozzle member 2 downside. The space area over the melted metal surface 15a of the melting vessel 1 is made into inactive gas atmosphere. The oxygen concentration in this space area is measured and monitored.

Abstract: In a glass melter, a precious metal insert is used to protect a gas bubbler from corrosion at the orifice of the bubbler through which gas is injected into the melt. The use of a precious refractory metal insert at the bubbler orifice prevents the attack of molten glass on the bubbler. The precious metal is chosen from the refractory group of metals and the platinum group of metals. Preferably the precious metal from the platinum group is platinum or one of its alloys or one of ruthenium, rhodium, palladium, osmium and iridium. The precious metal from the refractory group is preferably chromium.

Abstract: A carbon powder inlet and a graphite powder collecting are oppositely arrange on a furnace body. At least a pair of electrodes are oppositely arranged in the furnace body with respect to a graphitizing area at an intermediate position between the inlet and the collecting port and are engaged with different timing.

Abstract: There is disclosed an impedance-heated furnace for processing a nonflowable but conveyable material at the processing temperature comprising a nonrotating shell having electrical-conducting properties, and heated to a processing temperature using electrical impedance as the heat source. The shell includes an inlet and an outlet and a conveyor means, which also may be heated by impedance, for transporting or carrying the material along or through the shell. The resulting solids and any generated or volatilized gases are recovered separately.

Abstract: An aluminum can melting furnace in which a slip stream of molten material is diverted from a main molten bath in the furnace, a vortex is formed in the diverted slip stream, and thin walled aluminum can feedstock is introduced into the vortex. The feedstock is immediately drawn under the surface of the vortex in the slip stream so the feedstock melts before it has a chance to oxidize. Hydrocarbons which are introduced with the feedstock are flash vaporized in the vortex. The hydrocarbon vapors are captured and conducted to the furnace burner where they are burned to increase the efficiency of the operation and reduce the pollution generated by the process.

Abstract: The invention relates to an electrode system for melting and stirring and also for temperature control in metallurgical vessels. To achieve optimum energy utilization with minimal gas consumption, the electrode system comprises, according to the invention, a central electrode and an outer electrode (10, 11) which are each attached to a height adjustment (12) and are connected to a common electric power source (16), to form an electric arc between central electrode and melt below the surface of the melt bath, and an annular space (23) between central electrode and outer electrode (10, 11), which is connected to a gas source (25), with the gas system being designed in such a way that finely particulate additives can also be charged into the melt.

Abstract: An apparatus for processing various hazardous waste materials by melting in a vessel for subsequent solidification is disclosed which includes a seal for the cover thereof. Melter includes a high-speed mixing impeller powered by a drive shaft which extends through an opening in the cover. The vessel is electrically heated by discharge of electrical energy through the melt contained in the vessel. In one embodiment the impeller and shaft are included in the electrical heating circuit. A shaft seal engages the shaft at a point spaced from the cover. An axially extensible seal seals a space bounded by the shaft seal and the opening in the cover. Purge gas is supplied to the sealed space to provide positive gas flow from the sealed space into the vessel. A cold wall transport duct for off-gas porting is disclosed. A bottom drain structure including a sleeve and plug is also disclosed. The output of the melter may be subsequently heated in a holding tank to refine the output.

Abstract: A vertical glass melting furnace of the type having an inlet for raw materials at the top thereof, an outlet for molten glass at the bottom thereof, and a tabular electric resistance heating element for melting which is immersed at some level in molten glass, has at least one opening, and covers almost entirely the cross-section of the furnace at that level, the vertical glass melting furnace comprising a stirrer which extends from above the furnace and passes through the batch layer and the tabular heating element so that the stirrer brings about forced circulation for homogenization of the molten glass which has passed through the tabular heating element and stays in the region below the tabular heating element.

Abstract: The invention provides a method for growth of single crystals from the melt by directional solidification in vertical bottom seeded crucibles. The crucible confining the melt is insulated radially and from above. The heat is supplied to the melt by a heater submerged in the melt or an auxiliary heater above the crucible containing the melt. A small portion of the melt is enclosed between the submerged heater and the growing crystal. The confined melt in this region is thermally stratified and therefore stagnant.

Abstract: A process for refining aluminum using a segregation solidification process under a positive pressure inert gas protecting atmosphere comprising, maintaining the temperature of molten aluminum in the vessel by a plurality of electric heater sections arranged around the periphery of said vessel in vertically superposed relationship to each other, cooling a narrow peripheral portion of the inner surface of said vessel beneath the level of the molten aluminum therein by means of a peripheral cooling section arranged around the periphery of said vessel between adjacent heater sections to crystallize the molten aluminum onto said peripheral portion of the inner surface of said vessel, scraping off the refined and solidified aluminum on said peripheral portion by scraping and tamping means having a cross-sectional configuration complementary to that of the inner surface of said vessel, tamping the heaped aluminum by said scraping and tamping means, and deenergizing some of said heater sections located at positions a

Abstract: The metallurgical vessel comprises a continuous wall and a bottom plate and such vessel constitutes a mold for electrically remelting an electrode by resistance heating of an electrically conductive slag bath. The metallurgical vessel further comprises solenoids for generating an electromagnetic field which is controlled by control means operatively connected to a reference signal generator and to magnetic measuring means like Hall generators preferably arranged tangentially relative to the vessel.

Abstract: A furnace for heating particulate material comprises an air-tight shell and a heat insulating lining which define a hollow shaft. Electrical resistance heating elements spaced along the length of the hollow shaft adjacent the insulating lining. A baffle system supported within the shaft promotes heating by radiation and convection. The baffle system has side supports vertically positioned within the shaft, a plurality of inner trays each defining pairs of sloping surfaces joined at a ridge, and a plurality of outer trays each defining a sloping surface. The outer trays are arranged to receive material falling from an inner tray thereabove and to deliver material to the ridge of an inner tray therebelow.

Abstract: Apparatus for regenerating activated carbon comprises a desorption tank having at its bottom an elongate channel-form passage sloping downwardly from an inlet end to an outlet end. A pulse voltage is applied to electrodes extending along the passage to regenerate the activated carbon as it flows from the inlet to the outlet. Flow of the activated carbon is intercepted by transverse weirs provided at spaced intervals along the length of the passage. An oscillatory swinging motion imparted to the tank by eccentrics on a rotating shaft promotes flow of the activated carbon along the passage from the inlet to the outlet and in particular causes carbon particles which have become lighter by virtue of regeneration to pass preferentially over the weirs and thereby progress more rapidly toward the outlet.

Abstract: A process and arrangement for the continual zonal heating or cooling of perably elongate treatment members within at least one zone extending perpendicular or transverse to the longitudinal axis, which programmatically traverses the treatment member in the longitudinal direction.