Abstract: An equipment for the measurement and control of load material and scrap metal feeding into an electrical arc furnace, including an automatic control device for feeding control of load material or scrap according to the energy supplied to the bath, and a measuring device for the added load material, in correlation with the automatic control device, comprising a weighing device for the furnace shell, its contents and any other components it may support.

Abstract: Gas burner (1) comprising a main metal body (6), an inner lance (11) for combustible gas, at least two outer lances (10) for combustible gas, a single duct (8) for conveying pre-heated air, a regulation system for the combustible gas, a refractory unit (30), characterized in that said gas burner (1) comprises a series of nozzles (20) for the injection of the preheated air into the combustion chamber, and in that, by operating on the gas regulation system, it is possible to switch, with continuity, from a flame functioning mode of the burner to a flameless functioning mode, the latter characterized by low emissions of polluting agents.

Abstract: A method for the recovery of refractory debris materials and ladle slags as process slags in the iron metallurgy production in EAFs and the related metering to the furnace for the formation of the process slag comprises the following steps: grinding and screening of the refractory debris materials until powders of controlled granulometry are obtained, storage of the powders in storage sites, injection of the powders into an EAF furnace by means of automatic metering of the various components.

Abstract: Measuring apparatus (50) of geometrical parameters of cylinders, rolls and similar elements (11), used for the rolling of flat products operating on a machine for the grinding of said cylinders with an autonomous movement, i.e. with a movement independent of the translation movement of the grinding wheel or other parts, characterized in that it comprises at least four sensors (54, 55), situated on a surface orthogonal to the cylinder (11) or roll and in that at least two of said sensors are situated in opposite positions.

Abstract: A Method for the recovery of the secondary metallurgy (LF) slag from a plant for the production of steel, the method comprising a cooling step of the slag, by means of the passage of air and/or other gas, a breakdown step, a step of extracting the powder, wherein the breakdown step is accelerated by means of forced convection of a cooling fluid and/or another reaction, gas and by means of moving the slag mass by overturning and vibrating support gratings. The overturning and vibrating support gratings are provided inside closed metallic boxes which are connected in series and closed with movable containment partitions to form a treatment module. The breakdown, step is accelerated by means of overturning the slag mass from the support grating of one metallic box to the support grating of an adjoining box.

Abstract: Apparatus for the combustion of gas exiting from an electric arc furnace where the heat of combustion is used for the preheating of scraps entering the furnace wherein the apparatus has an insertion device for introducing comburent substance into a preheating chamber or loading tunnel for scrap metal where the loding tunnel has an inlet section for scrap metal, a seal section to prevent an uncontrolled entrance of air in the tunnel, a heating section and an unloading section for delivering scrap metal to the furnace. The insertion device for the comburent substance has one or more adjustable openings placed in the loading tunnel, and said apparatus comprises a device or a series of devices.

Abstract: An apparatus for the combustion of gas exiting from an electric arc furnace for the preheating of scraps entering the furnace itself foresees an insertion device of comburent substance into a preheating chamber or loading tunnel of the scrap metal having an inlet section of the scrap metal, a seal section to prevent an uncontrolled entrance of air in the tunnel, a heating section and an unloading section of the scrap metal in the furnace. Said insertion device of the comburent substance comprises one or more adjustable openings placed in the loading tunnel, and said apparatus comprises a device or a series of devices, also not equipped with autonomous movement, of mechanical seal nature placed in the insertion or inlet section of the scrap metal in the loading tunnel or preheating chamber.

Abstract: A pyrometallurgic process for the treatment of post-steelwork residues, comprises the following phases: preparing a furnace (1) of the electric type, suitable for the introduction of the residues; preparing the residues, for example in a hopper with the possibility of mixing with additives and reaction elements; introducing the residues, together with suitable additives and chemical reagents, into the furnace (1); introducing directly into the slag, by means of lances (4), additives, flushing and reaction elements to correct the composition of the slag (7); reacting the residues with the slag (7) to obtain: a) separation of the liquid metallic phases which are added to the metal bath (6) to form a sellable liquid metal; b) separation of the metallic volatile elements in vapour phase which, when transferred to the free zone of the furnace (1) recombine with the oxygen for the formation of oxides and consequently of powder.

Abstract: A roller cleaning system (10) for an oven (20) equipped with a series of motorized rollers (21) each of which is in turn connected to a relative motor-reducer (24) for rotation activation, in turn connected to a relative frequency converter (25) driven by a respective control and activation device (26), said roller cleaning system (10) comprising a control and regulation unit (14) to independently control the rotation rate and direction of each roller of the series of motorized rollers (21) for the advancing of one or more flat blooms (40) and for cleaning at least one roller (34) causing the detachment of the flakes of oxide therefrom by scraping it against a flat bloom (40) with a variation in the rotation rate and/or direction of the same.

Abstract: A multifunction injector (10, 11, 12) comprising a De Laval nozzle (20) adapted to act as a burner at subsonic or supersonic speed, combined with a plurality of nozzles (31, 32) for fuel and comburant respectively, arranged in two rings, concentric and co-axial to said De Laval nozzle (20) and externally protected by a specifically shaped protection cavity (40).

Abstract: A device (10) for continuous measurement of the temperature of molten metal in a furnace or recipient for its production and treatment comprises a heat analysis instrument (14) placed in a lance (12) which blows inert gas and/or high-pressure compressed air against a surface of metal slag (18) of a furnace or recipient (20).

Abstract: A rotary hearth furnace for use in the iron and steel industry comprises a furnace (12, 112) with plan in the shape of an annulus, closed at the bottom by a rotary hearth (14, 114), lined at the top with refractory material (15, 115), and a base (28, 128; 30, 130) of the furnace (12, 112). Said hearth (14,114) comprises a plurality of sectors of an annulus (17, 117; 17?, 117?), all the same as one another and connected to form an annulus, complementary to that of the internal plan of the furnace (12, 112), which rotate around the central axis of the annulus, by means of two concentric sets of wheels (26, 126) arranged according to two circumferences, set at equal instances, with supports (25,125), fixed to the base (28) or below the hearth (114), complementary to two circular rails (20, 120), fixed respectively below the hearth (14) or the base (128). According to the invention, both said sets of wheels (26, 126) and said two rails (20, 120) are positioned in such a way as to have an equal load distribution.

Abstract: The invention relates to a biologically-degradable glass fiber composition having good mechanical properties, good workability and in particular fiber-forming-capabilty features and resistance to humidity. The concentrations expressed in percent by weight for each component being the object of the invention are: SiO2: 61 to 66; Al2O3: 1.1 to 2.1; (CaO+MgO): higher than 9; (Na2O+K2O): higher than 18; B2O3: 4 to 15; P2O5: 0 to 5; SO3: 0 to 1; Fe2O3: 0 to 0.5; Others: less than 2.

Abstract: The invention relates to a method for cooling a lance provided for converting a medium into a molten mass and/or for measuring the properties of the molten mass. A gas/liquid mixture is fed as a cooling medium into a cooling circuit which is closed up to the lance end (2) situated on the melting side. The invention provides that the gas/liquid mixture or the components thereof is/are fed and permitted to expand under pressure up to the area of the lance end (2) situated on the melting side. The invention also relates to a lance which has a mixing chamber (5, 6) connected to the cooling circuit The mixing chamber has the connections (3, 7) for a gas and liquid supply which is designed to produce the gas/liquid mixture, whereby the mixing chamber (5, 6) is connected via a pressure line (10) to at least one two-component nozzle (11) arranged in the area of the lance end (2) which is situated on the melting side.

Abstract: The invention regards a method for rolling a continuous billet (15) fed from a billet-heating furnace (10) set upstream of a roll train, in which, between the furnace (10) and a first stand (11) of the roll train is provided an operation of welding, during, billet movement, of the head of each billet (14), which has come out of the furnace (10) along an axis (12) of exit from the furnace, to the tail of the billet (15) being rolled, which is proceeding along a rolling axis (13). The aforesaid welding operation is carried out along the rolling axis (13) which is staggered with respect to the axis (12) of exit from the furnace.

Abstract: The invention regards a method for rolling billets fed from a billet-heating furnace (10) set upstream of a roll train, in which, between the furnace (10) and a first stand (11) of the roll train is provided a space for transfer of the billets coming out of the furnace. In the space between the furnace (10) and the stand (11) at least two billets (15, 14) are welded together and subsequently introduced into said stand (11).

Abstract: The invention refers to a straightener for rolled ferrous products, of the type in which a framework (11) comprises a pair of opposed shoulders (12, 13) which support two sets of rolls, a top set (14) and a bottom set (15), which define between them a straightening path for straightening said rolled products. According to the invention, said opposed shoulders (12, 13) may be translated horizontally between a closed, operative, position of containment and support of said rolls (14, 15), and an open, non-operative, position, in which said sets of rolls (14, 15) may be removed for replacement with other sets of different rolls. Moreover provided are supporting and transporting means, which are independent of the aforesaid framework (11), for supporting said sets of rolls (14, 15) in said open, non-operative, position of the shoulders (12, 13).

Abstract: An improved sliding chain-type ingot mold for a continuous casting plant, including two pairs of chains arranged in a closed ring system and configured to rotate in opposite directions, each pair including at least one of molding elements and shell-type elements which forms a closed mold, the two pairs of chains being arranged to wind up on respective sprockets, one pair having a first set of the at least one of molding elements and shell-type elements configured to interlock with a second set of the at least one of molding elements and shell-type elements on the other pair to form a cavity for receiving a molten material, external pressurizing rollers configured to act on the first and second sets of the plurality of at least one of molding elements and shell-type elements to detach and approach with each other, and fixed contrasting elements fixedly positioned to counteract the pressurizing rollers.

Abstract: In a sliding chain-type ingot mold (12, 13), each mold is constituted by molding elements (14, 15; 114, 115; 214, 215) representing two half-molds which can be made to face each other so as to form a closed mold shaping a cavity to hold the molten metal. According to the invention, some engaging elements (34, 134, 234) are provided, capable of interacting with cam-shaped surfaces (33, 133, 233) provided on one side on at least one (14, 114, 214) of said molding elements, and on the other side on a fixed frame (35) designed to detach and approach said molding elements.

Abstract: An improved surface characteristic measurement system for measuring a characteristic of a surface comprising a processor, a light source for providing a light beam on the surface to be measured, a position sensing device for sensing a position of a diffused light diffused by the surface, and a photodiode for sensing intensity of a reflected light reflected by the surface. The position sensing device, which may be a PIN diode, provides a position signal to the processor indicative of position of the diffused light while the photodiode provides a reflected light intensity signal to the processor indicative of reflected light intensity. The processor determines the surface characteristic based at least one of the position signal and the reflected light intensity signal.