A furnace as described in this invention comprises a temperature regulating portion to assist in melting a non-ferrous material, such as an aluminium, and to reserve said material for the subsequent casting or injection molding procedure. The furnace provides a mean to eliminate an oxide, such as iron oxide, which generally floats on the top layer of a molten material inside a melting portion and a heating portion by preventing the flow of said oxide into the temperature regulating portion. A sensor or any detector that can detect the level of the molten material is utilized to measure the surface level of said molten material. A temperature regulating burner, which is a flat flame type, is utilized on the ceiling of the temperature regulating portion in order to prevent any oxidation reaction to occur as well as to reduce the concentration of oxygen inside the portion.

Embodiments of the invention are directed to a rotor for a molten metal pump and a molten metal pump including the rotor. The rotor has a main body and a top comprised of a material that is at least twice as hard as the main body. The top, among other things, may form a first portion of each rotor blade wherein the first portion directs molten metal into a pump chamber or other structure in which the rotor is mounted.

A method including providing a quantity of metal, the quantity of metal being contaminated by a contaminant including a quantity of carbon; configuring a vacuum induction furnace to operate according to a set of operating parameters, the set of operating parameters being selected based on characteristics of the contaminant, the set of operating parameters including at least one of a pressure, an atmosphere composition, a pour temperature, or a hold time; charging the vacuum induction furnace with the quantity of metal; and operating the vacuum induction furnace to melt the quantity of metal in accordance with the set of operating parameters, whereby at least some of the contaminant is removed from the quantity of metal so as to provide an output metal having a concentration of carbon that is less than or equal to a concentration of carbon in the metal as cast.

The disclosure relates to a method for producing feedstock in piece form from metal, in particular aluminium and/or aluminium alloys, for a metal-casting installation, in particular aluminium-casting installation, in which scrap parts of metal, in particular of aluminium and/or aluminium alloys, are sorted on the basis of their alloying constituents and/or alloy contents and subsequently, on the basis of an alloy to be produced in the feedstock, the scrap parts are mixed into a composition having a homogeneous distribution of the alloy and fed to a press, in which the scrap parts of the composition are subjected to a pressure that compresses the scrap parts while generating a temperature, wherein, as a result of the application of pressure, the scrap parts are heated up to the transition temperature between solid and liquid of at least some of the scrap parts and/or the alloys and/or alloying constituents thereof before the feedstock is discharged in a specific geometrical form.

A method for recycling a Ni-based single crystal superalloy part or unidirectionally solidified superalloy part provided with a thermal barrier coating containing at least a ceramic on a surface of a Ni-based single crystal superalloy substrate or Ni-based unidirectionally solidified superalloy substrate, in which the method including the steps of: melting and desulfurizing a Ni-based single crystal superalloy part or Ni-based unidirectionally solidified superalloy part at a temperature of the melting point or more of the Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy and less than the melting point of the ceramic; heating a casting mold for a recycled Ni-based single crystal superalloy part or casting mold for a recycled Ni-based unidirectionally solidified superalloy part to a temperature of the melting point or more of the Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy; pouring the desulfurized melted Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy into the casting mold, and producing a melting stock or growing a Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy; and removing the melting stock or the recycled Ni-based single crystal superalloy part or recycled Ni-based unidirectionally solidified superalloy part from the casting mold. In this way, a method for recycling a Ni-based superalloy part, by which the recycle cost of a Ni-based superalloy part and the lifetime cost of a highly efficient gas turbine engine using a Ni-based superalloy part can be significantly reduced, and further a Ni-based superalloy part having the same high-temperature strength and oxidation resistance as those of a newly produced Ni-based superalloy part can be obtained, is provided.

Embodiments of the invention are directed to a rotor for a molten metal pump and a molten metal pump including the rotor. The rotor has a main body and a top comprised of a material that is at least twice as hard as the main body. The top, among other things, may form a first portion of each rotor blade wherein the first portion directs molten metal into a pump chamber or other structure in which the rotor is mounted.

The invention is a continuation of U.S. Pat. No. 9,617,610 issued on Apr. 11, 2017. It consists of a process to treat comingled and co-mixed ferrous and non-ferrous scrap by heat from flue gases generated in the hearth of the furnace, charging and melting the treated ferrous scrap after removing contaminants and non-ferrous elements of the scrap through a three step process in a triple chamber furnace (FIGS. 1 and 4). The furnace consists of a first chamber (4) where the scrap is loaded, and treated in an oxygen deficient flue gas atmosphere downstream of a heat recuperator (3), at high temperature to cause the peeling and melting of zinc from galvanized scrap, the melting of non-ferrous components of the scrap and their collection at the bottom of the chamber at a dedicated spout (23) to a crucible (24), the pyrolysis of paints, plastic and used tire contaminants of the scrap. Upstream of the recuperator flue gas from the second stage, or charging and melting chamber (2) rise to exchange heat in the recuperator (3) and pre-heat combustion air on its way to the primary burner of the furnace (11). Ferrous scrap after being separated from non ferrous elements is charged into the second stage or charging and melting chamber (2); the chamber having a floor sloped at an angle less than the angle of repose of steel in a solid form, so that the molten iron and steel can flow to the third stage or hearth (1) where carbon is added at the carburizer (5), alloying elements at the charging spout (6) and oxygen carrying gases, gaseous, liquid and pulverized solid fuel are applied at the burner (11) to complete the refining of the scrap and their discharge for castings. To achieve the pyrolysis needed to eliminate coating, paint, rubber tires, plastic scrap, the combustion in the hearth is completed at stoichometric ratio to deplete the flue gases from oxygen. Flue gases on the discharge of the triple chamber Cokeless furnace are treated by conventional methods to extract dust, condense and separate hydrocarbons that resulted from the pyrolysis in the scrap in the treatment chamber prior to discharge to the environment (27). Condensed hydrocarbons are burned in the hearth (1) for additional heat. Non-ferrous molten metals collected in a crucible or channel furnace (24) are further processed outside the triple chamber furnace. In a different embodiment of the invention, containers full of scrap tires, scrap plastics and non-ferrous scrap (34) are charged closed in the scrap processing chamber, heated externally by flue gases and the containers ven

An electronic waste processing apparatus has a power supply device, a vacuum cracking device, a filter device, and a separation device. The vacuum device is electrically connected to the power supply device, and has a vacuum pump, a vacuum chamber, and a high-frequency furnace body. The vacuum chamber is connected to and communicates with the vacuum pump. The high-frequency furnace body is disposed in the vacuum chamber. The filter device is electrically connected to the power supply device, and is connected to and communicates with the high-frequency furnace body of the vacuum cracking device. The separation device is electrically connected to the power supply device, is connected to and communicates with the vacuum pump and the filter device, and has a condensation cylinder, a cooling cylinder, and an oil storage tank.

A multi-chamber melting furnace for melting scrap of non-ferrous metals, in particular aluminum scrap, including a first shaft furnace with a shaft for charge material, in which impurities of the charge material can be removed, and at least one furnace chamber which is connected to the shaft of the first shaft furnace and has a first heat supply device, wherein at least one second shaft furnace with a shaft for charge material, in which shaft impurities of the charge material can be removed, the furnace chamber being connected to the shaft of the second shaft furnace and being arranged between the shafts in such a manner that the furnace chamber forms a main melting chamber in which the molten bath is located during operation.

To provide a method with which it is possible to ascertain a gas concentration in a furnace rapidly, and to charge an amount of fuel and/or oxygen corresponding to the state within the furnace, and with which it is possible to reduce the device maintenance load. In order to solve the abovementioned problem, this method for analyzing components contained in flue exhaust gas of a furnace includes: a sampling step of collecting a portion of the flue exhaust gas from a flue; a dust removal step of using a centrifugal dust collecting device to separate out dust in the flue exhaust gas collected in the sampling step, to yield an analysis gas; a measuring step of measuring components in the analysis gas to obtain the concentration of carbon monoxide in the analysis gas; and an analysis gas discharging step of causing the analysis gas to be sucked by an ejector.