US3743263A - Apparatus for refining molten aluminum - Google Patents

Apparatus for refining molten aluminum Download PDF

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US3743263A
US3743263A US00211950A US3743263DA US3743263A US 3743263 A US3743263 A US 3743263A US 00211950 A US00211950 A US 00211950A US 3743263D A US3743263D A US 3743263DA US 3743263 A US3743263 A US 3743263A
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gas
metal
vessel
refining
molten metal
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A Szekely
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Union Carbide Industrial Gases Technology Corp
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Union Carbide Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23311—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2366—Parts; Accessories
    • B01F23/2368—Mixing receptacles, e.g. tanks, vessels or reactors, being completely closed, e.g. hermetically closed
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/066—Treatment of circulating aluminium, e.g. by filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23314—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer element

Definitions

  • the apparatus of the invention is capable of injecting gas in the form of small discrete bubbles into a mass of molten metal.
  • the apparatus comprises a rotatable shaft coupled to drive means at its upper end and a vaned rotor at its lower end. Gas under sufficient pressure to be injected into the melt is fed into a passageway extending axially through the device whereby upon rotation of the rotor the gas is injected into the molten metal and subdivided into discrete gas bubbles.
  • the process of the invention utilizes the above described gas injection apparatus for refining molten aluminum by introducing an inert gas into the metal beneaththe surface of the melt.
  • This invention relates in general to refining ofmolten aluminum, and more particularly, to a method and apparatus for removing dissolved gases and non-metallic impurities from molten aluminum and its alloys without the emission of corrosive or environmentally harmful gases and fumes.
  • Molten aluminum prior to casting contains many impurities which, if not removed, cause high scrap loss in casting, or otherwise cause poor metal quality in products fabricated therefrom.
  • the principal objectionable impurities are dissolved hydrogen and suspended non-metallic particles such as the oxides of aluminum and magnesium, refrac-,
  • the solubility of hydrogen in aluminum alloys decreases by about an order of magnitude when the metal solidifies. Consequently, hydrogen gas is released from the metal during casting if the hydrogen content of the molten metal is not reduced below the solid solubility limit of hydrogen in the metal. Hydrogen causes pinhole porosity in rapidly solidified metal such as directchill cast ingots, or fills shrinkage cavities in slowly solidified metal. Even hydrogen remaining dissolved in the metal after solidification is harmful, since it diffuses during heat treatment into voids and other discontinuities in the solid metal, therebyaggravating the harmful I effects of these defect points on the properties of the metal. Excessive amounts of hydrogen cause bright flakes in forgings and blisters in rolled products.
  • Solid, non-metallic particles suspended in the molten metal cause serious difficulties during casting and fabrication of aluminum alloys.
  • These particles consist mainly of oxides which are introduced into the melt with the scrap during the melting operation, or are produced by'direct oxidation with air, water vapor, carbon dioxide and other oxidizing gases while the metal is processed in the molten state.
  • Fine, broken-up oxide films stirred into the molten metal are particularly harmful, since in contrast to the more macroscopic oxides and other solid particles they cannot be skimmed off as dross and remain suspended in the molten metal. It has been suggested that buoyancy is provided for these oxide particles by microscopic hydrogen bubbles adsorbed on the particles.
  • the term sound metal is used in reference to the quality of the molten metal immediately prior to casting, and is intended to mean that both dissolved hydrogen andnon-metallic impurities are removed from the molten metal to an extent required for the production of substantially flawless cast ings or for fabrication of the particular alloy into a useful metal product.
  • the soundness of the metal is determined by conventional testing procedures well known in the art, such as vacuum solidification test of the molten metal before casting, metallographic and ultrasonic examinations of the solid metal according to relevant standards, porosity tests, destructive testing, etc.
  • chlorine vaporizes aluminum in the form of aluminum chloride gas, and reacts with substantially all the alloying elements in aluminum alloys. This is undesirable from both an operational as well as economic standpoint. Furthermore, unreacted chlorine gas represents a health hazard for operating personnel. Therefore, the fluxing chamber :is generally operated under negative pressure to prevent leakage of the toxic gas into the atmosphere. This, however, facilitates the entry into the chamber of air and moisture from the surrounding atmosphere which then come into contact with the molten metal. As a result, the metal can be recontaminated with hydrogen and oxygen during and after the fluxing operation.
  • inert gases such as nitrogen and argon
  • inert gases have been suggested for the fluxing of aluminum and its alloys.
  • comparative tests carried out with these inert gases at conditions similar to those used for chlorine fluxing have shown that the inert gases were inferior to chlorine in their fluxing ability, and in addition have caused operational difficulties.
  • the problems encountered with the use of inert gas have included a less efficient degree of hydrogen removal, severe splashing of the metal atgas flow rates at which no splashing occurred with chlorine, poor non-metallic impurity removal and a significant increase in the metal content of the dross. I
  • porous media has been suggested for the introduction of the inert gas into the metal instead of conventional fluxing tubes. This suggestion was apparently aimed at improving the gas injection technique and, in fact, contributed in some cases to better utilization of the inert gas in removing hydrogen.
  • this technique has not gained wide acceptance by the aluminum industry, due to the fact that only at rela-- tively low gas flow rates can porous media efficiently disperse the gas into distinct gas bubbles in molten aluminum, and because at practical gas flow rates the degree of non-metallic impurity removal has been unsatisfactory.
  • inert gases introduced through porous materials are used principally for degassing aluminum alloys under special plant conditions, where the production routine and economics justify a relatively slow metal treatment rate.
  • OBJECTS Accordingly,it is an object of this invention to provide a device capable of injecting inert gas into a molten metal bath, such as aluminum, in the form of small discrete bubbles at high gas flow rates in such manner as to cause the gas bubbles to come into intimate contact with the entire mass of the molten metal bath.
  • a device capable of subsurface injection of gas in the form of small discrete bubbles into a mass of molten metal contained in an enclosure comprising in combination:
  • the second aspect of the present invention is a system for refining molten aluminum comprising in com bination: (l) a gas injection device as set forth above, (2) an insulated vessel provided with entrance and exit means for the continuous flow of molten metal through said vessel, means for the discharging of gas from said vessel and (3) a vessel cover which seals said vessel to prevent infusion of air and moisture into said vessel, which enables said vessel to be operated under positive pressure and which has an opening therein into which said gas injection device is inserted in a sealed manner.
  • the third aspect of the present invention is a process for removing dissolved hydrogen and non-metallic impurities from molten aluminum prior to casting comprising the steps of:
  • inert gas as used herein is meant to include gases which are inert towards molten aluminum. Argon and nitrogen or mixtures thereof are preferred for this purpose although, the inert gases of the periodic table viz., helium, krypton, xenon or mixtures of any of them are also suitable for the present invention.
  • aluminum as used throughout the specification and claims ismeant to include pure aluminum metal as well as alloys of aluminum.
  • FIG. 1 is a perspective view of a preferred embodiment of the gas injection device of the present invention
  • FIG. 2 is a cross-sectional view of the device shown in FIG. 1;
  • FIG. 3 is a schematic diagram in cross-section illustrating a preferred system for refining a metal stream in a continuous process in accordance with the present invention
  • FIGS. 4 and 5 are a cross-sectional and a top view, respectively, of another preferred embodiment of apparatus suitable for refining molten metal in accordance with the present invention.
  • the gas injection device of the present invention is characterized by its ability to inject a gas at high flow rates into molten metal in the form of discrete gas bubbles and to achieve a high degree of gas dispersion throughout the melt.
  • the device when in operation, induces flow patterns in the metal in the vicinity of the device such that the gas bubbles which are formed, are
  • Such preheating is provided in the present invention by conducting the gas through a passageway running the ,length of the device which is submerged in the hot mol ten metal.
  • the initially cold gas is preheated by contact with the hot, heat conducting walls of the gas passageway, whereby the gas is expanded before being subdivided into gas bubbles. Consequently, the number of bubbles generated from a given volume of gas is increased substantially, and thermal growth of the small bubbles in the melt is substantially prevented.
  • the injection device of the present invention When used for injecting inert gas into molten aluminum, the injection device of the present invention produces an unanticipated improvement in the efficiency of the refining operation.
  • the vigorous stirring action produced by the device coupled with the large gas/metal contact area of the well distributed gas bubbles, assure efficient removal of solid particulate impurities suspended in the melt a major deficiency in the prior art of light metal refining with inert gases.
  • the process of the invention can refme aluminum at an efficiency comparable to that achieved with chlorine, while eliminating the problems inherent with chlorine fluxing.
  • the gas injection device consists of rotor ll, equipped with vertical vanes 2, and rotated by means of a motor, such as an air motor or electric motor (not shown) through shaft 3.
  • Shaft 3 which does not contact the melt during normal operation, may be constructed of steel, while the remainder of the equipment is preferably constructed from a refractory material, such as commercially available graphite or silicon carbide, materials which are inert toward aluminum and its alloys at the operating temperatures involved.
  • Shaft 3 is shielded from the molten metal by sleeve 4, which is fixedly attached to stator 5.
  • a plurality of vertical channels 11 are machined into stator 5.
  • the upper flow pattern 13 has a main velocity vector pointing essentially downward, i.e., it is coaxial with the axis of rotation of the rotor 1, thereby forcing the molten metal through the channels 11 of stator 5;
  • the lower, more localized flow pattern indi cated byarrows l2 develops beneath the rotor l and is pointed essentially upward and perpendicular to the axis of rotation of the rotor l.
  • the resultant flow of these components is indicated by arrows 14, which 1 show that the molten metal is forcefully discharged by from rotor 1.
  • the resultant flow pattern causes a well distributed and uniform gas dispersion and a thorough agitation of the molten metal within the treating vessel.
  • An inert gas (indicated by arrow 15), such as argon or nitrogen, is introduced into the annular passageway 10 at a predetermined pressure and flow rate.
  • the gas fills the bell shaped pocket 16 which is a continuation of passageway 10 surrounding neck 17 of rotor 1. Since the gas is supplied at a pressure greater than the pressure prevailing in the molten metal at a height indicated by arrow 18, the gas pocket 16 prevents molten metal from running back through the gas passage and from coming in contact with the metal shaft 3 of the gas injector.
  • Neck 17 surrounds shaft 3 and is constructed from a material resistant to molten aluminum in order to protect shaft 3 from attack by molten aluminum.
  • inert gas 15 into annular passageway 10 need not necessarily be the sole means of providing the gas to be injected.
  • An alternate embodiment of the invention may include a hollow shaft, wherein a passageway 19 extends axially through shaft 3 and is provided with a plurality of drillings 20 which provide communication with passageway 10 and gas pocket 16.
  • inert gas (indicated by arrows 15 and 25) may be provided through either passageway 10 or passageway 19 or both.
  • the cold gas (indicated by arrows l and 25) entering the injector be preheated during its passage through passageway or passageway 19, and gas pocket 16 by contacting the sleeve 4 and shaft 3 which are essentially at the temperature of the melt.
  • the preheated gas is forced between the vanes of the rotor l where it is broken up into small discrete bubbles by collision with the vanes 2 and by the metal flow sweeping past the vanes.
  • the forced circulation of the metal around the injector device rapidly disperses the gas bubbles as they are formed in a direction essentially along the main flow velocity vector, indicated by arrows M.
  • the initial trajectory of the gas bubbles follows the direction of the arrows 14 until the buoyancy force prevails and causes the gas bubbles to rise to the surface of the melt.
  • the beneficial effects of the forced circulation pattern of the metal around the injection device include the following: (1) the provision of an efficient mechanism for small gas bubble formation, (2) the prevention of bubble coalescence by dispersing the small gas bubbles almost simultaneously with their formation, (3) the provision of efficient circulation of the metal, and (4) prolonged residence time of the gas bubbles in the melt beyond the time they wouldremain in the melt if gravity were the sold force acting upon them.
  • the process of the invention can be carried out in a batch-type operation, or in a continuous operation by using a refining system such as shown in FIG. 3.
  • the refining system comprises a cast iron shell 31 which is maintained at its operating temperature by conventional heating means which may be located in well 32, and is insulated against heat loss by an outer refractory shell 33.
  • the inner surface of shell 31 is lined with graphite 34 or with other refractory materials which are inert to molten aluminum and non-metallic impurities likely to be present.
  • Shell 31 is provided with a cover 36 which rests upon flanges 39.
  • a gas-tight seal is provided between flanges 39 and cover 36 which may be bolted or otherwise fastened thereto, thereby allowing the system to be operated without the iltration of air.
  • a gas injection device 35 such as that shown in PEG. 3, is fastened to cover 36 and supported therefrom.
  • inert gas (indicated by arrow 37) is injected into molten metal 38 by gas injector 35.
  • the gas after passing through the molten metal, collects in head space 43 to form an inert gas blanket over the melt and leaves through metal inlet port 40 counter-current to the incoming flow of metal.
  • the free cross-sectional area of the gas passage, and hence the pressure in the system, is regulated by damper 49 located in port 40.
  • the slightly pressurized inert gas in head space 43 prevents air leakage into the vessel.
  • metal inlet port 40 Entry of the metal 38 into the refining system is through metal inlet port 40.
  • metal 38 is sparged by the uniformly distributed small bubbles of inert gas and is agitated by the action provided by the rotating gas injector 35. Hydrogen dissolved in the melt diffuses into and is carried away by the bubbles of inert gas as they rise through the melt to the melt surface 42.
  • the large surface area of the finely dispersed gas bubbles also serves as an efficient transport means for suspended oxide particles to dross layer 48 at the melt surface 42 from where they can be removed by skimming.
  • the major overall circulation pattern developed in the molten metal are schematically shown by arrows 50. It is this induced flow pattern of metal in the vessel which continues to bring fresh metal into contact with the gas bubbles which are being discharged from the space between the rotor and stator of the injection device.
  • the refined molten metal leaves the refining vessel through discharge port 44 situated below the metal surface 42 in wall 45.
  • the metal then passes through well 46 and leaves the system through exit trough 47 to a casting station.
  • Well 46 may contain a conventional filtering medium, such as, graphite or solid refractory chips.
  • Skimrning of the metal surface 42 may be accomplished by stopping the inlet flow of metal to the refining vessel while maintaining the flow of inert gas 37 through gas injector 35 so as to push the dross layer 48 into inlet trough 40 from where it may be removed by mechanical means.
  • metal surface 42 can be skimmed by means of a hand tool inserted into shell 31 through inlet trough 40 or through an opening (not shown) in cover 3 6.
  • the refining operation is not restricted to being carried out in a single refining zone as shown in FIG. 3; rather, the vessel may contain a plurality of individual refining compartments or zones through which the molten metal passes in series.
  • FIGS. 4, and 5 illustrate such an alternate arrangement.
  • the refining vessel 55 is constructed from a refractory which is inert to molten aluminum, and is insulated against heat losses with high temperature insulating materials. if necessary, the vessel may also be provided with electric heating elements (not shown) to compensate for heat losses.
  • Refining vessel 55 is provided with a cover 56 which is attached to vessel 55 gas-tight leaving only the metal inlet trough 57 unsealed.
  • Gas injectors 39 and as which are of the type described in FIG. l, and their respective drives 61 and 62 are supported by cover 56. Arrows '75 indicate inert gas entering gas injectors 591 and (MD through their respective inlet ports.
  • the refining vessel 55 is intended to be used in continuous operation, i.e., molten metal is continuously supplied through inlet trough 57 into the vessel 55, the metal is refined by continuous agitation and gas injection through injectors 59 and 60, and the refined metal is continuously withdrawn from the vessel via exit trough 58.
  • Reference to FIG. 5 shows that refining vessel 55 is provided with two refining zones 63 and 64 separated by a baffle plate 65.
  • the metal first enters refining zone 63 where it is agitated and sparged with an inert gas provided by gas injector 59.
  • the metal leaves the refining zone 63, in part by overflow over the top of baffle plate 65, and partly by underflow through ports 66 provided in baffle plate 65.
  • the metal is further refined in the second refining zone 64 where it is similarly agitated and sparged with inert gas provided by gas injector 60.
  • the metal leaves refining zone 64 by overflowing the bottom baffle plate 67 and entering exit pipe 68.
  • Exit pipe 68 is fabricated from a refractory material, such as graphite or silicon carbide and serves to conduct the refined molten metal from refining zone 64 to exit well 69 where it leaves the refining vessel through exit trough 58.
  • the refining gas introduced into the system passes through the molten metal, collects in head space 74 above the metal and leaves the refining vessel 55 through inlet trough 57 above and in counter-current flow to the entering molten metal.
  • the pressure in the refining vessel 55 may be adjusted by a hingeddamper 73, located in inlet trough 57, by regulating the free cross-sectional area of the gas passage in inlet trough 57.
  • the degree of refining which is necessary will, of course, vary with the intended use of the cast product.
  • the addition of a salt flux may be advantageous during refining to promote oxide-metalseparation.
  • the flux is selected from the group consisting of halides of alkali and alkaliearth metals. This chemical flux may be charged into the inlet trough 57 when the flow of metal is initiated through the refining vessel or through a port (not shown) providedin the cover 56.
  • the exit well 72 maybe filled with a suitable filtering medium, preferably one having a density lower than that of molten aluminum or its alloys, such as coke or crushed graphite, to insure removal of the flux from the metal as it leaves the refining vessel 55.
  • a suitable filtering medium preferably one having a density lower than that of molten aluminum or its alloys, such as coke or crushed graphite, to insure removal of the flux from the metal as it leaves the refining vessel 55.
  • An efficient and convenient alternate method of providing an in situ fluxing agent to the bath is the addition of a small amount of chlorine to the inert gas.
  • chlorine is introduced into a molten aluminum alloy containing magnesium, part of the chlorine reacts with magnesium forming magnesium chloride, an efficient fluxing agent, the remaining part reacts with aluminumforming aluminum chloride gas.
  • magnesium chloride is preferentially formed relative to aluminum chloride, tothe extent that substantially all the chlorine supplied with the inert gas reacts with magnesium. It is therefore possible to generate an effi ient in situ" fluxing agent in magnesium containing aluminum alloys by introducing chlorine into the melt, in a highly diluted form withan inert gas, through the injection device of the present invention.
  • concentration of chlorine in the inert gas is generally regulated in the range of O to 5 vplume percent depending upon the magnesium content of the alloy, but in no case is it allowed to exceed the amount which results in the emission of harmful byproducts from the system. 7
  • a distinct advantage of the system of the present invention is that it can be readily adjusted to supply the refining gas requirements for different alloy grades and the speed of refining can be matched to a wide range of casting rates.
  • the specific refining gas requirement generally expressed as volume of gas at normal temperature and pressure per unit weight of metal to be treated, is a function of the composition of the alloy and the degree of purity required in the finished product.
  • the flow rate of metal through the refining system is governed by the required speed of casting, i.e., by the type of casting machines used and by the number of ingots cast simultaneously from the refined metal.
  • the following examples illustrate a convenient way by which operating conditions in the system may be adjusted depending upon the particular alloy to be refined and the desired rate of refining in accordance with the present invention. 7
  • the flow rate of the refining gas per gas injection device is calculated from the following formula:
  • R 300 750V 83r )/d where: R the speed of rotation of the rotor, (RPM);
  • V the gas flow rate through the device as calculated from formula( I normal cu.ft./min;
  • the least cross-sectional dimension of refining zone 63 is the smaller of the two dimensions indicated by arrows and 71;
  • This formula yields an approximate RPM for the rotor which ensures a satisfactory dispersion of the refining gas and a good stirring of the metal bath under most operating conditions. From the formula it can be seen that the speed of the rotor must be increased with increasing refining gas flow rates. It should be noted, however, that it is possible to operate the device at significantly lower speeds than predicted by this formula, the optimum speed being dictated primarily by the desired degree of refining.
  • EXAMPLE I 1,640 lbs of alloy selected from the 6,000 series is to be refined in 12 minutes.
  • the specific refining gas requirement of the alloy is C 0.0146 normal cu.ft. gas/lb metal.
  • the system contains one gas injection device and is characterized by the following dimensional constants:
  • the refining rate, W, defined in formula (1) is calculated as W 1,640 lbs/ 12 minutes 137 lbs/min.
  • EXAMPLE II A high strength structural alloy selected from the 7,000 series is to be refined in a continuous operation, i.e., while the metal is being transferred to a casting station where several fabricating ingots are cast simultaneously from the refined alloy, at a total rate of 37,000 lbs metal/hour.
  • the specific refining gas requirement of the alloy was determined by experimentation as C 0.019 normal cu.ft./lb.
  • the system contains two gas injection devices and is characterized by the following dimensional constants:
  • the solution of formula 1) yields a gas flow rate of V 5 .86 normal cu.ft./min and, in accordance with formula (2), a satisfactory refining is achieved by rotating the gas injection devices at a speed of 739 RPM.
  • the induced circulation pattern is such as to transport the injected gas bubbles in a direction extending radially outward from the axis of said device with a downward component relative to said axis.
  • the rotatable shaft contains a second passageway extending axially therethrough and is provided with a plurality of drillings which communicate with said axially extending passageway, formed by the inner surfaces of said sleeve and stator and the outer surface of said shaft, for conveying and discharging said gas into said mass of metal.
  • Apparatus for refining molten aluminum comprising in combination: (1) a gas injection device as set forth in claim 1, (2) an insulated vessel provided with entrance and exit means for the continuous flow of molten metal through said vessel, means for the discharging of gas from said vessel and (3) a vessel cover which seals said vessel to prevent infusion of air and moisture into said vessel, which enables said vessel to be operated under positive pressure and which has an opening therein into which said gas injection device is inserted in a sealed manner.

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  • Manufacturing & Machinery (AREA)
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  • Mechanical Engineering (AREA)
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JP (1) JPS5236487B2 (enrdf_load_stackoverflow)
AU (1) AU471539B2 (enrdf_load_stackoverflow)
CA (1) CA981912A (enrdf_load_stackoverflow)
ES (4) ES410033A1 (enrdf_load_stackoverflow)
FR (1) FR2166014B1 (enrdf_load_stackoverflow)
IN (2) IN137552B (enrdf_load_stackoverflow)
IT (1) IT974890B (enrdf_load_stackoverflow)
NO (1) NO134754C (enrdf_load_stackoverflow)
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Cited By (85)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839019A (en) * 1972-09-18 1974-10-01 Aluminum Co Of America Purification of aluminum with turbine blade agitation
US3871872A (en) * 1973-05-30 1975-03-18 Union Carbide Corp Method for promoting metallurgical reactions in molten metal
US3892395A (en) * 1972-09-28 1975-07-01 Foseco Int Stopper rods
US3902895A (en) * 1973-02-09 1975-09-02 Wolfgang Wuth Method for the treatment of fusible non-ferrous metals, particularly copper, by means of a blowing-on of reaction gases
US3904180A (en) * 1973-05-18 1975-09-09 Southwire Co Apparatus for fluxing and filtering of molten metal
US3917242A (en) * 1973-05-18 1975-11-04 Southwire Co Apparatus for fluxing and filtering of molten metal
US3972709A (en) * 1973-06-04 1976-08-03 Southwire Company Method for dispersing gas into a molten metal
US4007923A (en) * 1975-07-18 1977-02-15 Southwire Company Molten metal filter
US4040610A (en) * 1976-08-16 1977-08-09 Union Carbide Corporation Apparatus for refining molten metal
US4169584A (en) * 1977-07-18 1979-10-02 The Carborundum Company Gas injection apparatus
US4203581A (en) * 1979-03-30 1980-05-20 Union Carbide Corporation Apparatus for refining molten aluminum
EP0038608A1 (en) * 1980-04-21 1981-10-28 Union Carbide Corporation Apparatus for refining molten metal
EP0042196A1 (en) * 1980-06-12 1981-12-23 Union Carbide Corporation Apparatus for refining molten metal
US4357004A (en) * 1981-07-06 1982-11-02 Union Carbide Corporation Apparatus for refining molten metal
FR2506785A1 (fr) * 1981-05-27 1982-12-03 Sumitomo Light Metal Ind Appareil pour le traitement de metal fondu
EP0151434A1 (en) * 1984-01-25 1985-08-14 Norsk Hydro A/S Method of and apparatus for treating and breaking up a liquid with the help of centripetal force
EP0136394A3 (en) * 1983-10-06 1986-05-07 Yokosuka Boat Kabushiki Kaisha Method and apparatus for solution of gas in liquid
US4634105A (en) * 1984-11-29 1987-01-06 Foseco International Limited Rotary device for treating molten metal
US4714494A (en) * 1986-12-08 1987-12-22 Aluminum Company Of America Trough shear diffusor apparatus for fluxing molten metal and method
US4784374A (en) * 1987-05-14 1988-11-15 Union Carbide Corporation Two-stage aluminum refining vessel
US4992241A (en) * 1990-03-15 1991-02-12 Alcan International Limited Recycling of metal matrix composites
US5000782A (en) * 1986-11-03 1991-03-19 United Technologies Corporation Powder mixture for making yttrium enriched aluminide coatings
FR2652018A1 (fr) * 1989-09-20 1991-03-22 Pechiney Rhenalu Dispositif de traitement au moyen de gaz d'un bain liquide d'aluminium de grande surface maintenu a l'etat stationnaire dans un four.
US5158737A (en) * 1991-04-29 1992-10-27 Altec Engineering, Inc. Apparatus for refining molten aluminum
US5198180A (en) * 1991-02-19 1993-03-30 Praxair Technology, Inc. Gas dispersion apparatus with rotor and stator for molten aluminum refining
EP0500052A3 (en) * 1991-02-19 1993-09-22 Union Carbide Industrial Gases Technology Corporation Improved gas dispersion apparatus for molten aluminum refining
TR27649A (tr) * 1992-04-15 1995-06-14 Union Carbide Ind Gases Tech Erimis alüminyumun tasfiyesi icin gelistirilmis gaz dagitma aygiti.
US5527381A (en) * 1994-02-04 1996-06-18 Alcan International Limited Gas treatment of molten metals
US5656235A (en) * 1995-01-27 1997-08-12 Foseco International Limited Through airlock for refining furnance
US5662725A (en) * 1995-05-12 1997-09-02 Cooper; Paul V. System and device for removing impurities from molten metal
US5678807A (en) * 1995-06-13 1997-10-21 Cooper; Paul V. Rotary degasser
US5718416A (en) * 1996-01-30 1998-02-17 Pyrotek, Inc. Lid and containment vessel for refining molten metal
US5814126A (en) * 1994-01-12 1998-09-29 Cook; Thomas H. Method and apparatus for producing bright and smooth galvanized coatings
US5846481A (en) * 1996-02-14 1998-12-08 Tilak; Ravindra V. Molten aluminum refining apparatus
WO1999034024A1 (en) * 1997-12-24 1999-07-08 Alcan International Limited Injector for gas treatment of molten metals
US5944496A (en) * 1996-12-03 1999-08-31 Cooper; Paul V. Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6027685A (en) * 1997-10-15 2000-02-22 Cooper; Paul V. Flow-directing device for molten metal pump
US6235183B1 (en) * 1995-09-08 2001-05-22 Basf Aktiengesellschaft Electrolytic method for the production of sodium and aluminum chloride
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6398525B1 (en) 1998-08-11 2002-06-04 Paul V. Cooper Monolithic rotor and rigid coupling
US6398844B1 (en) * 2000-02-07 2002-06-04 Air Products And Chemicals, Inc. Blanketing molten nonferrous metals and alloys with gases having reduced global warming potential
US6682585B2 (en) 2000-02-07 2004-01-27 Air Products And Chemicals, Inc. Refining nonferrous metals and alloys with gases having reduced global warming potential
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
FR2851578A1 (fr) * 2003-02-25 2004-08-27 Lethiguel Dispositif de purification par degazage d'un metal liquide
RU2238990C1 (ru) * 2003-04-08 2004-10-27 Алмекс Сша, Инк. Устройство для дегазации и рафинирования расплава металлов и их сплавов (варианты)
RU2244021C2 (ru) * 2001-04-24 2005-01-10 Норск Хюдро Аса Устройство для обработки жидкости
WO2006021066A1 (en) * 2004-08-27 2006-03-02 De Castro Marcio Moraes System of gas and/or gas and powders injection in liquid metals throough rotary refractory lance
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
WO2009114147A2 (en) 2008-03-11 2009-09-17 Pyrotek, Inc. Molten aluminum refining and gas dispersion system
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
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US8869316B2 (en) 2008-06-23 2014-10-28 Christopher Mark Lewis Articulated body armour
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9145597B2 (en) 2013-02-22 2015-09-29 Almex Usa Inc. Simultaneous multi-mode gas activation degassing device for casting ultraclean high-purity metals and alloys
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9205490B2 (en) 2007-06-21 2015-12-08 Molten Metal Equipment Innovations, Llc Transfer well system and method for making same
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US11426996B2 (en) 2019-02-28 2022-08-30 Canon Kabushiki Kaisha Ultrafine bubble generating method, ultrafine bubble generating apparatus, and ultrafine bubble-containing liquid
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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1428146A (en) * 1972-09-18 1976-03-17 Aluminum Co Of America Purification of aluminium
SE7706137L (sv) * 1976-06-18 1977-12-19 Union Carbide Corp Sett att raffinera smelt metall
JPS5426907A (en) * 1977-08-02 1979-02-28 Rozai Kogyo Kk Mixing method of molten metal in aluminum melting furnace
JPS55105520U (enrdf_load_stackoverflow) * 1979-01-20 1980-07-23
FR2491954A1 (fr) * 1980-10-14 1982-04-16 Pechiney Aluminium Dispositif de traitement d'un bain de metal liquide par injection de gaz
JPS5731280Y2 (enrdf_load_stackoverflow) * 1981-01-08 1982-07-09
FR2512067B1 (fr) * 1981-08-28 1986-02-07 Pechiney Aluminium Dispositif rotatif de dispersion de gaz pour le traitement d'un bain de metal liquide
US4738717A (en) * 1986-07-02 1988-04-19 Union Carbide Corporation Method for controlling the density of solidified aluminum
AU2006308469B2 (en) * 2005-10-25 2011-09-08 Stas Inc. In-line salt refining of molten aluminium alloys
JP2020142232A (ja) * 2019-02-28 2020-09-10 キヤノン株式会社 ウルトラファインバブル生成方法、ウルトラファインバブル生成装置、およびウルトラファインバブル含有液
JP7223725B2 (ja) * 2020-06-04 2023-02-16 堺アルミ株式会社 アルミニウム溶湯処理方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227547A (en) * 1961-11-24 1966-01-04 Union Carbide Corp Degassing molten metals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227547A (en) * 1961-11-24 1966-01-04 Union Carbide Corp Degassing molten metals

Cited By (176)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839019A (en) * 1972-09-18 1974-10-01 Aluminum Co Of America Purification of aluminum with turbine blade agitation
US3892395A (en) * 1972-09-28 1975-07-01 Foseco Int Stopper rods
US3902895A (en) * 1973-02-09 1975-09-02 Wolfgang Wuth Method for the treatment of fusible non-ferrous metals, particularly copper, by means of a blowing-on of reaction gases
US3904180A (en) * 1973-05-18 1975-09-09 Southwire Co Apparatus for fluxing and filtering of molten metal
US3917242A (en) * 1973-05-18 1975-11-04 Southwire Co Apparatus for fluxing and filtering of molten metal
US3871872A (en) * 1973-05-30 1975-03-18 Union Carbide Corp Method for promoting metallurgical reactions in molten metal
US3972709A (en) * 1973-06-04 1976-08-03 Southwire Company Method for dispersing gas into a molten metal
US4007923A (en) * 1975-07-18 1977-02-15 Southwire Company Molten metal filter
US4040610A (en) * 1976-08-16 1977-08-09 Union Carbide Corporation Apparatus for refining molten metal
US4169584A (en) * 1977-07-18 1979-10-02 The Carborundum Company Gas injection apparatus
US4203581A (en) * 1979-03-30 1980-05-20 Union Carbide Corporation Apparatus for refining molten aluminum
EP0017150A1 (en) * 1979-03-30 1980-10-15 Union Carbide Corporation Apparatus for refining molten aluminium
EP0038608A1 (en) * 1980-04-21 1981-10-28 Union Carbide Corporation Apparatus for refining molten metal
EP0042196A1 (en) * 1980-06-12 1981-12-23 Union Carbide Corporation Apparatus for refining molten metal
US4373704A (en) * 1980-06-12 1983-02-15 Union Carbide Corporation Apparatus for refining molten metal
FR2506785A1 (fr) * 1981-05-27 1982-12-03 Sumitomo Light Metal Ind Appareil pour le traitement de metal fondu
DE3219782A1 (de) * 1981-05-27 1982-12-30 Sumitomo Light Metal Industries Ltd., Tokyo Vorrichtung zum behandeln von geschmolzenem metall
US4401295A (en) * 1981-05-27 1983-08-30 Sumitomo Light Metal Industries, Ltd. Apparatus for treating molten metal
US4357004A (en) * 1981-07-06 1982-11-02 Union Carbide Corporation Apparatus for refining molten metal
EP0069434A1 (en) * 1981-07-06 1983-01-12 Union Carbide Corporation Apparatus for refining molten metal
EP0136394A3 (en) * 1983-10-06 1986-05-07 Yokosuka Boat Kabushiki Kaisha Method and apparatus for solution of gas in liquid
EP0151434A1 (en) * 1984-01-25 1985-08-14 Norsk Hydro A/S Method of and apparatus for treating and breaking up a liquid with the help of centripetal force
US4618427A (en) * 1984-01-25 1986-10-21 Ardal Og Sundal Verk A.S. Method of treating and breaking up a liquid with the help of centripetal force
US4634105A (en) * 1984-11-29 1987-01-06 Foseco International Limited Rotary device for treating molten metal
US5000782A (en) * 1986-11-03 1991-03-19 United Technologies Corporation Powder mixture for making yttrium enriched aluminide coatings
US4714494A (en) * 1986-12-08 1987-12-22 Aluminum Company Of America Trough shear diffusor apparatus for fluxing molten metal and method
US4784374A (en) * 1987-05-14 1988-11-15 Union Carbide Corporation Two-stage aluminum refining vessel
FR2652018A1 (fr) * 1989-09-20 1991-03-22 Pechiney Rhenalu Dispositif de traitement au moyen de gaz d'un bain liquide d'aluminium de grande surface maintenu a l'etat stationnaire dans un four.
EP0419378A1 (fr) * 1989-09-20 1991-03-27 Pechiney Rhenalu Dispositif de traitement au moyen de gaz d'un bain liquide d'aluminium de grande surface maintenu à l'état stationnaire dans un four
US4992241A (en) * 1990-03-15 1991-02-12 Alcan International Limited Recycling of metal matrix composites
WO1991014009A1 (en) * 1990-03-15 1991-09-19 Alcan International Limited Recycling of metal matrix composites
EP0500052A3 (en) * 1991-02-19 1993-09-22 Union Carbide Industrial Gases Technology Corporation Improved gas dispersion apparatus for molten aluminum refining
US5198180A (en) * 1991-02-19 1993-03-30 Praxair Technology, Inc. Gas dispersion apparatus with rotor and stator for molten aluminum refining
US5158737A (en) * 1991-04-29 1992-10-27 Altec Engineering, Inc. Apparatus for refining molten aluminum
TR27649A (tr) * 1992-04-15 1995-06-14 Union Carbide Ind Gases Tech Erimis alüminyumun tasfiyesi icin gelistirilmis gaz dagitma aygiti.
US5814126A (en) * 1994-01-12 1998-09-29 Cook; Thomas H. Method and apparatus for producing bright and smooth galvanized coatings
US5527381A (en) * 1994-02-04 1996-06-18 Alcan International Limited Gas treatment of molten metals
US5656235A (en) * 1995-01-27 1997-08-12 Foseco International Limited Through airlock for refining furnance
US5662725A (en) * 1995-05-12 1997-09-02 Cooper; Paul V. System and device for removing impurities from molten metal
US5678807A (en) * 1995-06-13 1997-10-21 Cooper; Paul V. Rotary degasser
US6235183B1 (en) * 1995-09-08 2001-05-22 Basf Aktiengesellschaft Electrolytic method for the production of sodium and aluminum chloride
US5718416A (en) * 1996-01-30 1998-02-17 Pyrotek, Inc. Lid and containment vessel for refining molten metal
US5846481A (en) * 1996-02-14 1998-12-08 Tilak; Ravindra V. Molten aluminum refining apparatus
US5944496A (en) * 1996-12-03 1999-08-31 Cooper; Paul V. Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection
US6345964B1 (en) 1996-12-03 2002-02-12 Paul V. Cooper Molten metal pump with metal-transfer conduit molten metal pump
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6027685A (en) * 1997-10-15 2000-02-22 Cooper; Paul V. Flow-directing device for molten metal pump
WO1999034024A1 (en) * 1997-12-24 1999-07-08 Alcan International Limited Injector for gas treatment of molten metals
US6056803A (en) * 1997-12-24 2000-05-02 Alcan International Limited Injector for gas treatment of molten metals
US6398525B1 (en) 1998-08-11 2002-06-04 Paul V. Cooper Monolithic rotor and rigid coupling
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6398844B1 (en) * 2000-02-07 2002-06-04 Air Products And Chemicals, Inc. Blanketing molten nonferrous metals and alloys with gases having reduced global warming potential
US6682585B2 (en) 2000-02-07 2004-01-27 Air Products And Chemicals, Inc. Refining nonferrous metals and alloys with gases having reduced global warming potential
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
RU2244021C2 (ru) * 2001-04-24 2005-01-10 Норск Хюдро Аса Устройство для обработки жидкости
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US8110141B2 (en) 2002-07-12 2012-02-07 Cooper Paul V Pump with rotating inlet
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8440135B2 (en) 2002-07-12 2013-05-14 Paul V. Cooper System for releasing gas into molten metal
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
FR2851578A1 (fr) * 2003-02-25 2004-08-27 Lethiguel Dispositif de purification par degazage d'un metal liquide
RU2238990C1 (ru) * 2003-04-08 2004-10-27 Алмекс Сша, Инк. Устройство для дегазации и рафинирования расплава металлов и их сплавов (варианты)
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US8475708B2 (en) 2003-07-14 2013-07-02 Paul V. Cooper Support post clamps for molten metal pumps
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US11020798B2 (en) 2007-06-21 2021-06-01 Molten Metal Equipment Innovations, Llc Method of transferring molten metal
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US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
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US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
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US11130173B2 (en) 2007-06-21 2021-09-28 Molten Metal Equipment Innovations, LLC. Transfer vessel with dividing wall
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WO2009114147A2 (en) 2008-03-11 2009-09-17 Pyrotek, Inc. Molten aluminum refining and gas dispersion system
US9127332B2 (en) 2008-03-11 2015-09-08 Pyrotek, Inc. Molten aluminum refining and gas dispersion system
DE112009000565B4 (de) * 2008-03-11 2021-03-25 Pyrotek, Inc. Gasverteilvorrichtung zum Einspritzen von Gas und Flussmittel in geschmolzenes Aluminium, Verfahren zum gleichzeitigen Ausgeben von Gas und Flussmittel in geschmolzenes Aluminium und mit Flügeln versehener Rotor zur Verwendung in einer sich schnell drehenden Düsenanordnung
GB2470544A (en) * 2008-03-11 2010-11-24 Pyrotek Inc Molten aluminium refining and gas dispersion system
DE112009000565T5 (de) 2008-03-11 2011-01-05 Pyrotek, Inc., Spoklane Aufbereitungs- und Gasverteilungssystem für geschmolzenes Aluminium
WO2009114147A3 (en) * 2008-03-11 2010-02-04 Pyrotek, Inc. Molten aluminum refining and gas dispersion system
GB2470544B (en) * 2008-03-11 2012-11-28 Pyrotek Inc Molten aluminium refining and gas dispersion system
US20090229415A1 (en) * 2008-03-11 2009-09-17 Frank Robert A Molten aluminum refining and gas dispersion system
US8869316B2 (en) 2008-06-23 2014-10-28 Christopher Mark Lewis Articulated body armour
US9080577B2 (en) 2009-08-07 2015-07-14 Paul V. Cooper Shaft and post tensioning device
US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump
US9506129B2 (en) 2009-08-07 2016-11-29 Molten Metal Equipment Innovations, Llc Rotary degasser and rotor therefor
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US9464636B2 (en) 2009-08-07 2016-10-11 Molten Metal Equipment Innovations, Llc Tension device graphite component used in molten metal
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US9422942B2 (en) 2009-08-07 2016-08-23 Molten Metal Equipment Innovations, Llc Tension device with internal passage
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US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
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US9657578B2 (en) 2009-08-07 2017-05-23 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US10309725B2 (en) 2009-09-09 2019-06-04 Molten Metal Equipment Innovations, Llc Immersion heater for molten metal
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9482469B2 (en) 2010-05-12 2016-11-01 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9145597B2 (en) 2013-02-22 2015-09-29 Almex Usa Inc. Simultaneous multi-mode gas activation degassing device for casting ultraclean high-purity metals and alloys
US11391293B2 (en) 2013-03-13 2022-07-19 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US10641279B2 (en) 2013-03-13 2020-05-05 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened tip
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US10302361B2 (en) 2013-03-14 2019-05-28 Molten Metal Equipment Innovations, Llc Transfer vessel for molten metal pumping device
US10126058B2 (en) 2013-03-14 2018-11-13 Molten Metal Equipment Innovations, Llc Molten metal transferring vessel
US9587883B2 (en) 2013-03-14 2017-03-07 Molten Metal Equipment Innovations, Llc Ladle with transfer conduit
US10126059B2 (en) 2013-03-14 2018-11-13 Molten Metal Equipment Innovations, Llc Controlled molten metal flow from transfer vessel
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system
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US10307821B2 (en) 2013-03-15 2019-06-04 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US11286939B2 (en) 2014-07-02 2022-03-29 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
US10465688B2 (en) 2014-07-02 2019-11-05 Molten Metal Equipment Innovations, Llc Coupling and rotor shaft for molten metal devices
US10138892B2 (en) 2014-07-02 2018-11-27 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
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US10947980B2 (en) 2015-02-02 2021-03-16 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened blade tips
US11933324B2 (en) 2015-02-02 2024-03-19 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened blade tips
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US11098719B2 (en) 2016-01-13 2021-08-24 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US11519414B2 (en) 2016-01-13 2022-12-06 Molten Metal Equipment Innovations, Llc Tensioned rotor shaft for molten metal
US11098720B2 (en) 2016-01-13 2021-08-24 Molten Metal Equipment Innovations, Llc Tensioned rotor shaft for molten metal
US10641270B2 (en) 2016-01-13 2020-05-05 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US11149747B2 (en) 2017-11-17 2021-10-19 Molten Metal Equipment Innovations, Llc Tensioned support post and other molten metal devices
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US11426996B2 (en) 2019-02-28 2022-08-30 Canon Kabushiki Kaisha Ultrafine bubble generating method, ultrafine bubble generating apparatus, and ultrafine bubble-containing liquid
US11931803B2 (en) 2019-05-17 2024-03-19 Molten Metal Equipment Innovations, Llc Molten metal transfer system and method
US11931802B2 (en) 2019-05-17 2024-03-19 Molten Metal Equipment Innovations, Llc Molten metal controlled flow launder
US11858037B2 (en) 2019-05-17 2024-01-02 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US11471938B2 (en) 2019-05-17 2022-10-18 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US11358217B2 (en) 2019-05-17 2022-06-14 Molten Metal Equipment Innovations, Llc Method for melting solid metal
US11858036B2 (en) 2019-05-17 2024-01-02 Molten Metal Equipment Innovations, Llc System and method to feed mold with molten metal
US11850657B2 (en) 2019-05-17 2023-12-26 Molten Metal Equipment Innovations, Llc System for melting solid metal
US11358216B2 (en) 2019-05-17 2022-06-14 Molten Metal Equipment Innovations, Llc System for melting solid metal
US12263522B2 (en) 2019-05-17 2025-04-01 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US11759853B2 (en) 2019-05-17 2023-09-19 Molten Metal Equipment Innovations, Llc Melting metal on a raised surface
US11873845B2 (en) 2021-05-28 2024-01-16 Molten Metal Equipment Innovations, Llc Molten metal transfer device
US12228150B2 (en) 2021-05-28 2025-02-18 Molten Metal Equipment Innovations, Llc Molten metal transfer device
US12146508B2 (en) 2022-05-26 2024-11-19 Molten Metal Equipment Innovations, Llc Axial pump and riser

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NO134754B (enrdf_load_stackoverflow) 1976-08-30
SU1068040A3 (ru) 1984-01-15
ES414721A1 (es) 1976-02-01
ES414722A1 (es) 1976-06-16
IT974890B (it) 1974-07-10
IN140212B (enrdf_load_stackoverflow) 1976-09-25
IN137552B (enrdf_load_stackoverflow) 1975-08-16
ES410033A1 (es) 1975-12-01
JPS4873314A (enrdf_load_stackoverflow) 1973-10-03
NO134754C (enrdf_load_stackoverflow) 1976-12-08
JPS5236487B2 (enrdf_load_stackoverflow) 1977-09-16
FR2166014A1 (enrdf_load_stackoverflow) 1973-08-10
FR2166014B1 (enrdf_load_stackoverflow) 1975-03-28
ES439938A1 (es) 1977-03-01
AU471539B2 (en) 1976-04-29
CA981912A (en) 1976-01-20
SU982546A3 (ru) 1982-12-15
DE2263288B2 (de) 1976-06-24
DE2263288A1 (de) 1973-07-12
AU4943672A (en) 1974-05-30

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