Abstract: A method is provided for operating a blast furnace by blowing a solid reducing material, a flammable gaseous reducing material and a combustible gas into a blast furnace from tuyeres through a lance into a blast furnace, wherein a parallel type lance prepared by bundling three independent blowing tubes in parallel and integrally housing them into an outer tube is used, and either one or both of the gaseous reducing material and the combustible gas and the solid reducing material are simultaneously blown through the respective blowing tubes, while the blowing tube for the solid reducing material and the blowing tube for the gaseous reducing material are positioned above the blowing tube for the combustible gas in the blowing through the parallel type lance as well as a lance structure thereof.

Abstract: A method is provided for operating a blast furnace by blowing at least a solid reducing material and a combustible gas into the furnace through tuyeres with a lance inserted into a blowpipe, wherein a tube-bundle type lance obtained by bundling a plurality of blowing tubes is used and when only a solid reducing material or two kinds of a solid reducing material and a combustible gas or three kinds of a solid reducing material, a combustible gas and a gaseous reducing material is simultaneously blown into an inside of the blast furnace through a tube for blowing the solid reducing material, a tube for blowing the combustible gas and a tube for blowing the gaseous reducing material in the tube-bundle type lance, two or more tube-bundle type lances are inserted into the blowpipe to approximate their front ends to each other and blowing is performed so that the respective blowout streams interfere with each other in the blowpipe.

Abstract: A blast furnace operating method by blowing at least a solid reducing material into an inside of the furnace from a tuyere thereof with a lance, wherein a tube bundle-type lance formed by bundling a plurality of blowing tubes side-by-side and housing them in a main tube of the lance is used when only a solid reducing material or two kinds of a solid reducing material and a combustible gas or three kinds of a solid reducing material, a combustible gas and a gaseous reducing material are blown in the inside of the blast furnace, whereby the solid reducing material, combustible gas and gaseous reducing material are blown through the respective blowing tubes, and a tube bundle-type lance.

Abstract: Tuyere stock arrangement (10) of a blast furnace comprising a tuyere (14) having a tuyere body (20) configured for installation in a blast furnace wall (12); the tuyere body (20) having an outer wall (22), a front face (24) and a rear face (26), the tuyere body (20) further having a tuyere channel (28) extending from the rear face (26) to the front face (24), the tuyere channel (28) forming an inner wall (30) in the tuyere body (20). The tuyere stock arrangement (10) further comprises a blowpipe (34) connected between the rear face (26) of the tuyere body (20) and a gas feeding device (38), the blowpipe (34) being configured and arranged so as to feed hot gas, generally hot blast air, from the gas feeding device (38) to the tuyere channel (28) for injection into the blast furnace.

Abstract: The present invention relates to an injector for an arc furnace. The injector comprises a head suitable to face into the furnace and a body suitable to support the head. The head and body are manufactured separately from each other, and are fastened by means of removable connection means in order to implement said injector.

Abstract: An apparatus for injecting gas into a metallurgical vessel is disclosed. The apparatus comprises a gas flow duct, an elongate central tubular structure extending within the gas flow duct, a plurality of flow directing swirl vanes, inflow and outflow cooling water passages within the central structure, and a nose portion provided with one or more water cooling passages. The flow directing vanes are provided with internal water cooling vane passages. In use, water flow is communicated through the vane passages from the water inflow passage in the central structure to the water flow passage in the nose portion of the central structure such that at least some of the inflowing water will pass successively through the vane passages and the nose passage or passages and thence to the outflow passage.

Abstract: A jet of gas injected from a lance is fluidically deviated with a gas flowing in either the same or opposite direction as the jet of gas. The gas used to fluidically deviate the jet is the same as or different from the gas in the jet.

Abstract: A novel blaster nozzle used for assisting in the pneumatic removal of cloggings and cakings during the transport of particulate matter through an enclosure housing is set such that it can be removed and replaced from outside the enclosure housing. The blaster nozzle includes a nozzle head having an orifice for the conduction of high-pressure fluid, wherein the nozzle head is composed of a refractory concrete having from about 4-20% by volume metal fibers therein. The blaster nozzle also includes a flange member connected to the nozzle head and a connection tube extends from the flange member for connecting the blaster nozzle to an air cannon.

Abstract: The invention relates to a melting or reduction furnace (2), in which the charge stock (9) is supplied using feed pipes (17). Each feed pipe (17) has a mouthpiece (18) that is not cooled and is configured from an uncooled wear-resistant inner guide pipe (19) and an uncooled concentric, heat-resistant outer protective pipe (20).

Abstract: A swirling column nozzle comprises a nozzle body with an air chamber defined therein; an outlet portion, a feed pipe penetrating through the air chamber and extending to the outlet portion, an oxygen supplying portion disposed on the nozzle body, the outlet portion is formed with a swirling guide part for moving a mixture of the oxygen gas and the concentrate downwardly in the form of a swirling column. Further, a swirling column smelting equipment and a method thereof are disclosed. The air flow moves downwardly in a substantially swirling column, so the chemical reaction path and reaction time are extended remarkably, allowing the reduction of the height of the reaction shaft.

Abstract: Tuyere stock arrangement (10) of a blast furnace comprising a tuyere (14) having a tuyere body (20) configured for installation in a blast furnace wall (12); the tuyere body (20) having an outer wall (22), a front face (24) and a rear face (26), the tuyere body (20) further having a tuyere channel (28) extending from the rear face (26) to the front face (24), the tuyere channel (28) forming an inner wall (30) in the tuyere body (20). The tuyere stock arrangement (10) further comprises a blowpipe (34) connected between the rear face (26) of the tuyere body (20) and a gas feeding device (38), the blowpipe (34) being configured and arranged so as to feed hot gas, generally hot blast air, from the gas feeding device (38) to the tuyere channel (28) for injection into the blast furnace.

Abstract: The present invention proposes a pulverized coal injection lance (10) for feeding pulverized coal from a rear end of the lance (10) to a front end (11) of the lance (10). The lance (10) comprises an outer pipe (12) for conveying combustive gas, and an inner pipe (14), coaxially arranged within the outer pipe (12), for conveying pulverized coal. The inner pipe (14) forms a separation wall for separating the pulverized coal from the combustive gas. The separation wall is at least partially discontinued in a region near the front end (11) of the lance (10), thereby forming a mixing region (16) within the pulverized coal injection lance (10). According to an important aspect of the invention, the outer pipe (12) and the inner pipe (14) have substantially the same length and wherein the inner pipe (14) comprises at least one lateral opening (18, 20) for allowing pulverized coal and combustive gas to come into contact within the pulverized coal injection lance (10) near the front end (11).

Abstract: A metallurgical lance (27a) to extend through an opening in the wall of a smelting vessel barrel (16) and into the interior space of the vessel. Lance (27a) includes a central core tube (31) through which to pass solid particulate material into the vessel and an annular cooling jacket (32) surrounding the central core tube (31) throughout a substantial part of its length. Lance (27a) has a mounting structure (61) comprising an outer annular part (60) extended about cooling jacket (32) and about twice the diameter of the cooling jacket. The outer annular part (60) fits within a tubular lance mounting bracket (62) welded to the shell (16a) of vessel barrel (16) to extend outwardly from the vessel. The lance is held within mounting bracket (62) by clamping bolts acting between flanges (63,65) on the outer annular part (60) and mounting bracket (62).

Abstract: A gas supply system for a side blowing and/or bottom blowing metallurgical furnace with at least one tuyere which is mounted in the side wall and/or in the bottom of the furnace, wherein gas is conveyed through a line of the gas supply system to the tuyere and through the tuyere to the interior of the metallurgical furnace and emerges there in the form of bubbles. The gas supply system has an inflow restrictor which is assigned to the tuyere or is positioned upstream of the tuyere and reduces or interrupts the gas supply to the interior of the furnace at equal intervals of time.

Abstract: A novel blaster nozzle (10) used for assisting in the pneumatic removal of cloggings and cakings during the transport of particulate matter through an enclosure housing is set such that it can be removed and replaced from outside the enclosure housing. The blaster nozzle includes a nozzle head (12) having an orifice for the conduction of high-pressure fluid, wherein the nozzle head is composed of a refractory concrete having from about 4-20% by volume metal fibers therein. The blaster nozzle also includes a flange member (14) connected to the nozzle head and a connection tube (18) extends from the flange member for connecting the blaster nozzle to an air cannon.

Abstract: A jet of gas injected from a lance is fluidically deviated with a gas flowing in either the same or opposite direction as the jet of gas. The gas used to fluidically deviate the jet is the same as or different from the gas in the jet.

Abstract: The aim of the invention is to damp or suppress oscillations (?back-attack? effect) in sidewall or base blowing converters, used in particular to produce carbon steel or stainless steel. To achieve this, the gas supply system (3) for the converter comprises an inflow restrictor device (7), which is positioned upstream of or associated with the jets (5) and which periodically reduces or interrupts the gas supply to the interior of the furnace.

Abstract: The present invention proposes a pulverized coal injection lance (10) for feeding pulverized coal from a rear end of the lance (10) to a front end (11) of the lance (10). The lance (10) comprises an outer pipe (12) for conveying combustive gas, and an inner pipe (14), coaxially arranged within the outer pipe (12), for conveying pulverized coal. The inner pipe (14) forms a separation wall for separating the pulverized coal from the combustive gas. The separation wall is at least partially discontinued in a region near the front end (11) of the lance (10), thereby forming a mixing region (16) within the pulverized coal injection lance (10). According to an important aspect of the invention, the outer pipe (12) and the inner pipe (14) have substantially the same length and wherein the inner pipe (14) comprises at least one lateral opening (18, 20) for allowing pulverized coal and combustive gas to come into contact within the pulverized coal injection lance (10) near the front end (11).

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: The present invention relates to an industrial furnace for smelting metals, in particular nonferrous metals, and the respective nozzle element.

Abstract: A tuyere device for introduction of gaseous media under a liquid metal layer comprises a nest block made of refractory material provided with a sleeve incorporated therein, Coaxial metal tubes with at least one central channel and at least one annular channel which are arranged on the side thereof for entering a liquid metal and separately connected to inlets for supplying gaseous media to the metal. The coaxial tubes consist of two sections having different diameters. The first section has a smaller diameter and is used for supplying the gaseous media to the liquid metal. The second section has a larger diameter and is connected to the inlets for supplying gaseous media to the channels of the first section. The second section is also provided with an additional internal tube. The internal tube of the first section is closed on the both ends and filled with a refractory material. The invention provides a possibility to exclude metal break through the operating channels.

Abstract: Apparatus for injecting gas into a vessel including a gas flow duct 31 which receives hot gas through a gas inlet structure 32 at a rear end of the duct. An elongate central structure 33 extends throughout the length of duct 31 and carries a series of vanes 34 for imparting swirl to the gas flow exiting the forward end of the duct. The forward end of the duct 31 has an internally water cooled tip 36 and water flows to and from tip 36 through annular passages 43, 44 in the wall of duct 31. Vanes 34 are mounted on central structure 33 so as to extend to forward ends disposed within the duct tip 36 and are dimensioned such that during operation of the apparatus their forward ends are engaged and supported by the internally water cooled duct tip 36.

Abstract: Smelting apparatus comprises a vessel (11) and a solids injection lance (27a) extending through an opening in the wall of vessel barrel (16) into the interior space of the vessel. Lance (27a) includes a central core tube (31) through which to pass solid particulate material into the vessel and an annular cooling jacket (32) surrounding the central core tube (31) throughout a substantial part of its length. Lance (27a) has a mounting structure (61) comprising a tubular part (60) extended about cooling jacket (32) and about twice the diameter of the cooling jacket. Tubular part (60) fits within a tubular lance mounting bracket (62) welded to the shell (16a) of vessel barrel (16) to extend outwardly from the vessel. The lance is held within mounting bracket (62) by clamping bolts acting between flanges (63,65) on tubular part (60) and tubular bracket (62).

Abstract: A tuyere assembly for directing air and one or more fluid hydrocarbons into a cavity in a blast furnace. The tuyere assembly includes a blowpipe portion with a conduit defining a bore through which the air is directed. The tuyere assembly also includes a tuyere with a chamber defined by one or more walls thereof, the chamber being in fluid communication with the cavity of the blast furnace, and the chamber of the tuyere and the bore of the blowpipe portion form an internal cavity of the tuyere assembly. Also, the tuyere assembly includes one or more injector subassemblies having one or more outlet ends, each outlet end being adapted for directing the hydrocarbon into the internal cavity for combustion thereof to provide a flame substantially having a preselected flame configuration.

Abstract: A powder body melting burner which injects a powder body, fuel and oxygen into a furnace individually from a burner head and melts the powder body in flames in which the fuel is burned under oxygen support. The burner includes a single powder body injection hole provided in the center of the burner head, a plurality of fuel injection holes disposed at a predetermined central angle in the radial direction centered on the powder body injection hole, a single primary oxygen injection bole provided concentrically which each of the fuel injection holes, a plurality of second oxygen injection holes ranged in large numbers at a predetermined interval so as to enclose each of the powder injection boles and the fuel injection holes with the plurality of secondary oxygen injection holes forming a ring shape as a whole and a cooling chamber provided on the back side of the burner head.

Abstract: In the metallurgical treatment of metals, metal melts and/or slags in a metallurgical unit or melting vessel, especially in electric arc furnaces, injection devices (1) are used for blowing in or up oxygen-rich gases (6) and/or carbonaceous substances, which cause as long as possible gas jet (6?) with a high pulse energy to strike to strike the surface of the slag or metal. It is known to envelope produced gas jet (6?), thereby focusing it. According to the invention, such an envelope is obtained by using a hot gas (5, 5?) that is preaccelerated to such a degree that the central gas jet (6?) is preferably without pulse losses.

Abstract: The invention relates to a device (8) which is used to inject a treatment gas into a molten metal contained in a tank (1) and which is designed to be fixed in one of the walls of said tank. The inventive device comprises at least one injection nozzle (18) which is equipped with an end hole (19). Said device is characterised in that it comprises a mobile means (14) which can be manoeuvred from outside of the injection device and which is used to unblock the aforementioned end hole of the nozzle.

Abstract: A method for operating a vacuum vessel with a coherent jet wherein vacuum conditions are established within the vessel and an anchored or attached flame envelope resulting from subsonic velocity fuel and oxidant is provided around at least one supersonic gas stream.

Abstract: The invention relates to an arrangement (1, 12, 16) for continuously tapping a molten phase, such as matte, from a smelting furnace, such as a flash smelting furnace, said arrangement comprising a matte tapping hole (5) provided in the furnace wall for discharging the molten phase from the furnace, an overflow tank (6) for receiving the molten phase (4), and an overflow edge (8) provided in the overflow tank for discharging the molten phase, so that in the smelting furnace, in the vicinity of the matte tapping hole (5), there can be arranged at least one heat-producing element (9, 15) in order to prevent the molten phase from being solidified.

Abstract: A foldable golf swing training aid for use by a right-handed golfer and a left-handed golfer. A base receives a golf tee and includes a pair of members pivotally attached to each other so as to allow the base to be foldable. A pair of arms are pivotally attached to ends of the base, respectively, so as to allow the pair of arms to be foldabe. The pair of arms extend perpendicularly to the base in opposite directions to each other when in a use position, and overly associated base members when in the stored position. Indicia aids in positioning the base and the pair of arms relative to the right-handed golfer and the left-handed golfer, and corresponds to numbers of a clock including one, five, six, seven, and eleven.

Abstract: A method for the production of a layered metal slab by casting, which strip contains a central layer (2) and surface layers (3) on either side of it. The central layer (2) is introduced as a strip through a mould (4), into which is introduced molten metal (5), the mould (4) is cooled, whereupon a layered structure (1) is formed as the metal solidifies.

Abstract: A coherent jet lance and operating method employing two sets of ports for delivering fuel and oxidant respectively for formation of a flame envelope around one or more gas jets wherein the ports of at least one set and preferably of each set are angled outwardly on the lance face with respect to the lance axis.

Abstract: A system for generating mechanical waves for use in smelting and conversion processes that occur in furnaces and converters for a higher production of refined metals, consisting in a electrical signal generator, transducers that convert said electrical signals in mechanical waves placed on the outer end of air blowing tuyeres, a coupling means between said system and the shell of the converter, at least one resonant chamber that envelopes the air blowing tuyere and at least one transducer placed inside said resonant chamber, for applying mechanical waves that contain a great number of components of different amplitudes that travel with the airflow into the converter or pyrometallurgical furnace.

Abstract: A method is for feeding a gas into a metallurgical vessel having a condensable and/or evaporable component entrained by the gas. The gas is fed to the metallurgical vessel via one or more gas supply means. According to the method, if there are a number of the gas supply means, in a first section, the gas velocity is continuously increased, in a turbulence zone, the gas is intimately mixed with the condensable and/or evaporable component, in an exit section, the gas velocity is kept substantially constant, and the gas which has been intimately mixed with the entrained component is blown into the metallurgical vessel. A gas supply device for carrying out the method is also disclosed. The method and apparatus according t the invention make it possible to prevent or reduce nozzle damage.

Abstract: A system for generating mechanical waves for use in smelting and conversion processes that occur in furnaces and converters for a higher production of refined metals, consisting in an electrical signal generator, transducers that convert said electrical signals in mechanical waves placed on the outer end of air blowing tuyeres and a coupling means between said system and the shell of the converter. The air blowing tuyeres are placed forming an angle less than or equal to 90° with the transducer and the airflow entrance to the interior of the converter, forming a figure with an &agr; angle shape; and the transducer is placed in the direction of the cross axis of the converter pointing towards the &agr; angle of the air blowing tuyere, for applying mechanical waves that travel in a longitudinal direction with the airflow into the converter.

Abstract: A system for generating mechanical waves for use in smelting and conversion processes that occur in furnaces and converters for a higher production of refined metals, consisting in an electrical signal generator, transducers that convert said electrical signals in mechanical waves placed on the outer end of air blowing tuyeres and a coupling means between said system and the shell of the converter. The air blowing tuyeres are placed forming an 180° angle in the direction of the airflow entrance, while the transducers are placed transversally to the air blowing tuyeres so as to apply mechanical waves that travel in a transversal direction with the air flow into the converter or pyrometallurgical furnace.

Abstract: A method and an apparatus for advantageously introducing a flame and a high velocity oxidizing gas into a furnace for metal melting, refining and processing, particularly steel making in an electric arc furnace. The steel making process of an electric arc furnace is made more efficient by shortening the time of the scrap melting phase and introducing an effective high velocity oxidizing gas stream into the process sooner to decarburize the melted metal. In one implementation of an apparatus, improved efficiency is obtained by mounting a fixed burner/lance closer to the hot face of the furnace refractory at an effective injection angle. This mounting technique shortens the distance that the flame of the burner has to melt through the scrap to clear a path to the molten metal and shortens the distance the high velocity oxygen from the lance travels to the slag-metal interface thereby increasing its penetrating power.

Abstract: A metallurgical lance for introducing gas from above into a volume of metal in a vessel includes a head having at least one ejector formed therein. The ejector includes a Laval nozzle surrounded by a shrouding gas passage. Both the Laval nozzle and the shrouding gas passage communicate at their proximal ends with a common gas supply chamber. The shrouding gas passage communicates with the chamber via a first annular orifice member which determines the percentage split of the gas flow through the chamber between the Laval nozzle and the shrouding gas passage.

Abstract: An elongate metallurgical lance (27) for injecting solid particulate material into molten material held within a vessel (11) is disclosed. The lance includes a central core tube (31) through which to pass solid particulate material, an annular cooling jacket (32) surrounding the central core tube throughout a substantial part of its length, a coolant inlet means (52), and a coolant outlet means (53). An outer wall of a forward end section of the jacket is formed from a first material which has high heat transfer properties and can withstand external temperatures above 1100° C. for prolonged periods when the jacket is cooled by coolant flow. An outer wall of a body section of the jacket is formed from a second material that maintains its structural properties when exposed to external temperatures above 1100° C. for prolonged periods when the jacket is cooled by coolant flow, whereby the outer wall acts as a structural member that contributes to supporting the lance at these temperatures.

Abstract: A multi-purpose, multi-oxy-fuel High Temperature Power Burner/Injector/Oxygen Lance, Mechanical System Apparatus Device, for steelmaking from recycled scrap and/or virgin ferrous charge, which can be employed in multi-oxy-fuel (natural gas; pulverized carbonaceous matter; heavy oil), especially by Oxygen Combusted mixture of Natural Gas/Pulverized Carbonaceous Matter in High Temperature Power Burner Mode, for efficient and rapid melting of solid ferrous charge (cold or preheated) in a special steelmaking Metallurgical Furnace or Open Hearth Furnace, Tandem Furnace, BOF, EAF, as its augmenting or only source of thermal energy; more than one Device in Oxygen-Natural Gas/Pulverized Carbonaceous Matter Power Burner Mode, can be employed as the only source of thermal energy in a modified, originally Electric Arc Furnace, as total replacement of Graphite Electrodes and Electric Arc System, the replacement being noticeably more primary energy efficient than the thermal energy provided by Graphite Electrode/Arc Syste

Abstract: A system for establishing and maintaining a supersonic coherent gas jet, effective with either an oxidizing or an inert gas, employing a converging/diverging nozzle for establishment of a non-disruptive initial supersonic velocity, and a slower moving defined triple layered flame envelope coaxial with the jet for effective maintenance of the supersonic velocity. The invention is particularly useful for providing gas into a pool of liquid.

Abstract: A lance is provided for processing molten metal baths located in metallurgical tanks, and for heating the tanks. A first lance body is displaceable in a second lance body. A mechanism is provided for displacing the first lance body relative to the second lance body such that in a raised burner position of the first lance body, burner nozzles disposed in the second lance body are uncovered by the first lance body and are axially spaced from the lance mouth of the first lance body to receive gas discharge from the lance mouth and to allow burner operation. In a lowered blower position of the first lance body, the burner nozzles are covered thereby. The mechanism for displacing the lance bodies relative to one another permits infinitely variable spacing of the burner nozzles from the lance mouth that is provided for the discharge of gas.

Abstract: A lance which may be used to generate a longer coherent gas jet having inflowing and outflowing coolant fluid passages which are in flow communication and which straddle the flame envelope fluid passages, all of which are coaxial with the main passageway.

Abstract: A pulverized coal injecting apparatus includes a cylindrical inner pipe for feeding pulverized coal into a tuyere of a blast furnace. A cylindrical outer pipe coaxially surrounds the inner pipe. A spiral swirler is formed on the surface of the inner pipe and the pulverized coal is supplied through the inner pipe, while a combustible fluid is supplied through a space defined between the outer and inner pipes. The pulverized coal injecting apparatus further includes a plurality of dimples formed on a surface of a leading end portion of the inner pipe for reducing fluid flow resistance so as to improve the mixing of the pulverized coal with the combustible fluid. The fluid flow becomes efficient so as to improve the combustion efficiency of the pulverized coal. Thus, the oxygen enrichment cost and fuel costs are reduced.

Abstract: A lance (5) for injecting a feed material, preferably a solid feed material, into a metallurgical vessel, is disclosed. The lance comprises: an inlet (21) for introducing the feed material into the lance; an outlet (23) at a forward end of the lance (5) for discharging the feed material from the lance (5); a hollow elongate member (25) that defines a passageway (33) for the feed material between the inlet (21) and the outlet (23) and is adapted to be cooled by a first cooling fluid; and an outer jacket (35) positioned around a section of the length of the member (25) and is adapted to be cooled by a second cooling fluid.

Abstract: A reactor system that includes a reactor nozzle for use with a reactor vessel and process for its use for producing sodium metal, by a reaction of an alkali hydroxide, preferably sodium hydroxide, as a reactant, with methane gas as a reductant, at high heat.

Abstract: A method for operating a blast furnace includes feeding metallic charge materials, alloy elements and energy carriers in the upper part of the furnace shaft. An oxidizing agent is fed in the lower part of the shaft. Filler material, namely, alloy elements, metal chips, carbon, sands, dust are fed individually or in combination into the melting zone in at least one burst jet. Fuels may be introduced additionally into the first jet. The oxygen is fed at a high speed into the melting zone in at least one separate jet and the conditions of introducing the materials in the first jet and the oxygen in the second jet are controlled so that no flame can be formed.

Abstract: A system for establishing a plurality of coherent gas jets proximate one another using a single lance wherein plurality of gas jets are ejected from a corresponding plurality of nozzles in a lance and a flame envelope is established around the plurality of gas jets, and the jets remain distinct and do not coalesce for their length.

Abstract: A mixing process apparatus for discharging polymer material into a mold comprising a resin passage having an inlet for receiving polymer material and an outlet for discharge polymer material for molding, a first and second chamber communicates with said passage with each of said first and second chambers having a variable volume, said variable volume varying from a fill position for holding a predetermined volume of said polymer material to a discharge position for emptying polymer material, said first and second chamber being adapted for movement to transport said polymer material from a first mix position where one chamber is in a fill position and the other chamber is in an emptying position to a second mix position wherein said one chamber moves to an emptying position and said other chamber moves to a fill position, said first and second chamber being adapted for discharging said polymer material for molding when each of said chambers is in an emptying position.

Abstract: Disclosed is a lance head for a water-cooled oxygen lance for treating melts, especially for oxygen top-blowing onto steel melts in a converter, with at least one expansion nozzle which widens conically in the direction of the bath surface proceeding from a pipe portion having the narrowest nozzle cross section. This nozzle has, following the pipe portion that has the critical cross section, a first conical widening which opens into a cylindrical duct. At least one annular chamber is provided in the duct. A nozzle part which widens conically at least partially adjoins the annular chamber before the mouth of the expansion nozzle.