The publication relates to a method for melting solid metal, such as scrap aluminum, where the solid material is placed in a closed, insulated container (12) of a material having refractory qualities, the container (12) being provided with a bottom contact or electrode (26) and where the scrap metal preferably is compacted at least on the bottom of the container (12), and where an electrode (25) is lowered down into contact with the preferably compacted metal (11). Electric current is connected to the bottom contact (26) and the electrode (25) so that an electric current passes between the electrode (25) and the bottom contact (26) through the solid material (11). As an electrode a rotatable hollow cylinder (16) with a downwards open end (18) is used, the electrode (25) being arranged inside the rotatable hollow cylinder (16) and that the container (12) moreover is provided with a cylinder (19), for example made of graphite, surrounding the rotatable electrode (25); that solid metal at least is arranged inside the cylinder (19); that a light arc (29\8) is established between the electrode (25) and the metal (11) in contact with the bottom contact (26); and that the electrode is maintained in a non-rotating, stationary mode until the solid metal at least inside the cylinder (19) more or less has melted, whereupon the electrode (25) is brought to rotate. The publication also relates to a reactor (19) that uses an electrode forming a part of a hollow and rotatable rotor (15), the electrode (25) being arranged med a lower end inside the hollow rotatable rotor (15), and that the rotor (15) is arranged inside a stationary cylinder (19) surrounding the rotor(15), the cylinder (19) being provided with apertures (20,20') communicating with a space (13) in the container (12) that surrounds the cylinder (19).
F27D 11/08 - Heating by electric discharge, e.g. arc discharge
H05B 7/20 - Direct heating by arc discharge, i.e. where at least one end of the arc directly acts on the material to be heated, including additional resistance heating by arc current flowing through the material to be heated
2.
APPARATUS AND METHOD FOR SUPPLYING HEAT TO A METAL MELT
The invention relates to a device and a method for supplying heat to a metal melt, where in a closed container (11) with openings (13,14) for supply and discharge of the melt and where a sub pressure may be formed, a rotor (16) in the form of a hallow rotation body and a hollow driving shaft (20) containing the electrode (23) for supply of electric current for formation of an electric arc (34) towards the surface (31) of the metal of the melt. The lower end of the electrode (23) is positioned in a hollow head with an opening (35) downwards towards the bottom of the container (11). The hollow head is configured to provide access to the surface (31) of the metal melt, so that the electric arc (34) is formed inside the head and where the hollow driving shaft (20) possibly is configured for supply of gas to the metal melt. The lower end surface of the rotor (16) is configured so that a pumping effect in the heated melt beneath the lower end of the rotor (26) is formed, moving the heated melt sideways away from the rotor (16) along the lower, external end surface of the rotor (16).
Method and apparatus for determination of portion of pure metal in dross from a dross source, whereby the metal portion in the dross is determined by measuring the dross density and calculating the metal portion in accordance with the formula m% = k - p + a, where m% is percentage pure metal, p is the dross density and k and a are empirical constants. In accordance with the invention, the apparatus comprises a closed container (1) for dross provided with temperature gauge (9), pressure gauge (8) and an outlet pipe (18) having a valve (12) for removal of gas from the dross container (1), a closed container (2) for gas provided with a valve (14) for supplying gas from a gas source (16) to the gas container (2), whereby the dross container (1) and the gas container (2) are in a flow connection via a pipe (20).
Method for heating a fluid, in particular a fluid which is not electrical conductive, where a rotor body (10) which is arranged in a chamber for absorption of the fluid, is rotated with a generally vertical shaft (11). A voltage is applied to a rod shaped electrode (16) which is arranged centrally in a rotor chamber (12) and to an electrode at the bottom (13) of the rotor chamber, for creation of a flame arc, so that a flow of the fluid passing the flame arc is created. The length (L) of the flame arc is held generally stable, preferably constant by controlling the position of the rod shaped electrode (16). The fluid is made enter the rotor chamber (12) so that it is kept outside the flame arc, and that the fluid is provided to flow through the rotor chamber (12).
Device for adding a fluid to a liquid, for example of gas and/or particles to liquid metal. A rotor is rotated immersed in the liquid, comprising a hollow rotational body 10 with a first inner annular wall 16 with at least one radial opening 18 from a central, cylindrical chamber 19 and with an opening directed downwards. The rotational body is carried by a generally vertical shaft 12 which is connected to a powering unit and which may be arranged to lift the rotational body out of, respectively lower it into the liquid. Outside the central annular wall 16 of the rotational body 10 a further annular wall 14 which forms an annular chamber 17 is arranged, which communicates with the central chamber through the one or more radial openings 18. Advantages are achieved by that the one or more of the radial openings 18 are arranged in the lower part of the inner annular wall 16 of the rotational body, in a area which projects down under the surrounding additional annular wall 14.
Method for removal of elements from a metal melt in a container, which melt contains a base metal and elements of undesirable constituents, in which the metal melt is heated to a level maintaining the content melted. The metal melt is heated to a level causing vaporization of an element to be removed, but under the level providing gas pressure for the base metal. The container with the metal melt is brought under a reduced pressure in at least one compartment in which the temperature is maintained under the vaporization level of the element to be removed. A device for the removal of elements from metal melts, with a container (1) for the metal melt, with an exit tube (5) over the level of the metal melt, for vapour from the interior of the container (1). The exit tube (5) exits into a compartment (27) which is kept at a temperature under the vaporization temperature, for condensing the vaporized metal.
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