US20200255922A1 - Methods for recovering machining scrap - Google Patents

Methods for recovering machining scrap Download PDF

Info

Publication number
US20200255922A1
US20200255922A1 US16/860,301 US202016860301A US2020255922A1 US 20200255922 A1 US20200255922 A1 US 20200255922A1 US 202016860301 A US202016860301 A US 202016860301A US 2020255922 A1 US2020255922 A1 US 2020255922A1
Authority
US
United States
Prior art keywords
operating parameters
metal
temperature
induction furnace
aluminum alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/860,301
Other languages
English (en)
Inventor
Mark T. Kruzynski
Gregg E. Kruzynski
Vivek M. Sample
Achim Hofmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arconic Technologies LLC
Original Assignee
Arconic Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arconic Technologies LLC filed Critical Arconic Technologies LLC
Priority to US16/860,301 priority Critical patent/US20200255922A1/en
Publication of US20200255922A1 publication Critical patent/US20200255922A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • 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
    • C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/005—Preliminary treatment of scrap
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
    • 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
    • C22B21/068—Obtaining aluminium refining handling in vacuum
    • 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
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/10—Obtaining alkali metals
    • C22B26/12—Obtaining lithium
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor

Definitions

  • the present invention relates to methods for cleaning and recovering machining scrap, such aluminum-lithium (“AlLi”) alloy scrap, for reuse.
  • raw metal alloys e.g., in the form of extrusions or plates
  • water-soluble lubricant contains one or more organic compounds (i.e., compounds containing carbon) dissolved in water.
  • the result of the machining process is a finished product and a quantity of scrap.
  • the finished product may use only about 10% of the raw material and the remainder of the raw material may become machining scrap, which remains contaminated with the water-soluble lubricant.
  • the machining scrap has commercial value and is suitable for re-use, but cannot be re-used until the water-soluble lubricant has been cleaned therefrom.
  • a method includes providing a quantity of metal, the quantity of metal being contaminated by a contaminant including a quantity of carbon; configuring a vacuum induction furnace to operate according to a set of operating parameters, the set of operating parameters being selected based on characteristics of the contaminant, the set of operating parameters including at least one of a pressure, an atmosphere composition, a pour temperature, or a hold time; charging the vacuum induction furnace with the quantity of metal; and operating the vacuum induction furnace to melt the quantity of metal in accordance with the set of operating parameters, whereby at least some of the contaminant is removed from the quantity of metal so as to provide an output metal having a concentration of carbon that is less than or equal to a concentration of carbon in the metal as cast.
  • the quantity of metal includes a quantity of machining scrap.
  • a method also includes the step of prior to charging the vacuum induction furnace with the quantity of metal, compacting the quantity of metal into a unitary piece of metal.
  • the set of operating parameters includes a hold time, and the hold time is between 0 minutes and 60 minutes. In some embodiments, the set of operating parameters includes a pressure, and the pressure is between 1 micron and 300 microns. In some embodiments, the set of operating parameters includes an atmosphere composition. In some embodiments, the atmosphere composition includes an inert gas atmosphere. In some embodiments, the set of operating parameters includes a pour temperature, and the pour temperature is between 700° C. and 770° C.
  • the at least one contaminant includes sodium and a lubricant.
  • the set of operating parameters includes a pressure, a pour temperature, and a hold time, the pressure is between 1 micron and 300 microns, the temperature is between 700° C. and 755° C., and the hold time is between 30 minutes and 90 minutes.
  • the quantity of metal includes one of a 2000-series aluminum alloy, a 5000-series aluminum alloy, a 6000-series aluminum alloy, a 7000-series aluminum alloy, or an 8000-series aluminum alloy. In some embodiments, the quantity of metal includes an aluminum-lithium alloy.
  • the quantity of metal is further contaminated by a quantity of sodium.
  • the operating parameters include a temperature and a hold time, and the temperature and the hold time are selected so as to provide a residual sodium concentration that is less than a target concentration.
  • the target concentration is six parts per million.
  • the contaminant includes a lubricant.
  • the operating parameters include a pour temperature of about 700° C. and substantially no hold time.
  • the operating parameters include a pressure of about 300 microns.
  • the operating parameters include an argon atmosphere and a pressure of about 1 atmosphere.
  • FIG. 1 is a flowchart describing the steps of a method according to an exemplary embodiment
  • FIG. 2 is a schematic illustration of a vacuum induction furnace that may be used in connection with an exemplary embodiment.
  • the term “or” is an inclusive “or” operator, and is equivalent to the term “and/or,” unless the context clearly dictates otherwise.
  • the term “based on” is not exclusive and allows for being based on additional factors not described, unless the context clearly dictates otherwise.
  • the meaning of “a,” “an,” and “the” include plural references, unless the context clearly dictates otherwise.
  • the meaning of “in” includes “in” and “on”, unless the context clearly dictates otherwise.
  • the exemplary invention relates to a method for recovering machining scrap such that it is suitable for re-use. In some embodiments, the exemplary invention relates to a method for melting, cleaning, and purifying machining scrap such that it is suitable for re-use.
  • FIG. 1 shows a flowchart of a method 100 according to an exemplary embodiment.
  • a quantity of machining scrap is provided.
  • the machining scrap includes aluminum.
  • the machining scrap includes lithium.
  • the machining scrap includes aluminum and lithium.
  • the machining scrap includes a 2000-series aluminum alloy (i.e., a copper-based aluminum alloy).
  • the machining scrap includes a 7000-series aluminum alloy (i.e., a zinc-based aluminum alloy).
  • the machining scrap includes one or more of the alloys AA2050, AA2055, AA2060, AA2090, AA2091, AA2094, AA2095, AA2097, AA2098, AA2099, AA2195, AA2196, AA2197, AA2198, AA2199, AA2297 and AA2397, as these alloys are by the Aluminum Association.
  • the machining scrap is coated with a lubricant.
  • the lubricant includes sodium.
  • the machining scrap is not coated with a lubricant.
  • the machining scrap includes a non-lithium-containing aluminum alloy.
  • the machining scrap has a bulk density of between 20 and 50 pounds per cubic foot.
  • the machining scrap is compressed into a unitary piece.
  • the piece is of the type commonly referred to as a “puck”.
  • the machining scrap is bailed.
  • the machining scrap includes solids.
  • the piece has a mass of about 80 kilograms.
  • the piece has a weight of about 1,500 pounds.
  • the piece has a weight of between 3,000 pounds and 6,000 pounds.
  • a quantity of the machining scrap (e.g., in quantities as noted above) is selected for further processing, but is not compressed into a piece.
  • a puck is broken into smaller pieces before further processing occurs.
  • omitting the step of forming pucks, or, alternately, breaking the pucks into smaller pieces, will provide an increased lubricant-coated surface area that is exposed during subsequent steps of the method 100 . It will be apparent to those of skill in the art that this step may be repeated as necessary based on the amount of the machining scrap provided in step 110 .
  • a vacuum induction furnace is provided.
  • the vacuum induction furnace is a vacuum induction degassing and pouring furnace.
  • FIG. 2 shows an exemplary vacuum induction furnace.
  • the vacuum induction furnace includes an enclosed vacuum chamber.
  • the vacuum induction furnace includes a vacuum pump that is configured to remove gases (e.g., air, argon, vaporized lubricant) from the vacuum chamber.
  • the vacuum pump is configured to provide a configurable level of pressure within the vacuum chamber.
  • the vacuum pump is configured to provide a level of pressure between 1 micron (i.e., a unit of pressure that is equal to 1/1000 of a millimeter of mercury) and 1 atmosphere within the vacuum chamber.
  • the vacuum induction furnace includes a supply of argon that is configured to selectively introduce argon into the vacuum chamber.
  • the vacuum induction chamber includes a vent.
  • the vacuum induction furnace includes an induction furnace within the vacuum chamber.
  • the induction furnace is configured to heat the contents of a vessel to a selected temperature and for a selected period of time.
  • the vacuum induction furnace includes a mold within the vacuum chamber.
  • the vacuum induction furnace is configured to be operable to pour contents of the vessel (e.g., melted machining scrap) into the mold at a selected time (e.g., after the contents have been heated for a selected period of time).
  • the vacuum induction furnace is configured to operate according to a given set of parameters.
  • the parameters are selected so as to clean, melt, and cast aluminum-lithium machining scrap while minimizing oxidation losses, maximizing alloy retention (particularly maximizing retention of lithium), remove contaminants (e.g., lubricant) if necessary, and minimizing cycle time.
  • the parameters include a target temperature.
  • the parameters include a rate of heating to arrive at the target temperature.
  • heating is performed at a controlled rate so as to ensure that no moisture is trapped below the level of the melted metal.
  • the parameters are selected based on the characteristics of the machining scrap.
  • the parameters are selected based on whether the machining scrap is coated with lubricant. In some embodiments, the parameters are selected based on whether the machining scrap includes contaminants (e.g., sodium, calcium, potassium, etc.).
  • the vacuum induction furnace is configured to provide a vacuum. In some embodiments, the vacuum induction furnace is configured to provide an argon atmosphere. In some embodiments in which the vacuum induction furnace is to be configured to melt scrap having no lubricant (e.g., scrap resulting from dry machining), the vacuum induction furnace is configured to provide an argon atmosphere at or about atmospheric pressure, to provide a temperature of about 730° C., and to provide no hold time once the temperature has been reached.
  • the vacuum induction furnace is configured to provide either (a) a vacuum of about 300 microns or (b) an argon atmosphere at or about atmospheric pressure, to provide a temperature of about 700° C., and to provide no hold time once the temperature has been reached.
  • the vacuum induction furnace is configured to provide a vacuum of about 300 microns, to provide a temperature of between about 700° C.
  • the parameters include an internal atmosphere of the vacuum induction furnace (e.g., an atmosphere within the vacuum chamber of the vacuum induction furnace).
  • the internal atmosphere includes a pressure level.
  • the pressure level is represented in microns. In some embodiments, the pressure level is 1 micron. In some embodiments, the pressure level is 100 microns.
  • the pressure level is 200 microns. In some embodiments, the pressure level is 300 microns. In some embodiments, the pressure level is between 1 micron and 100 microns. In some embodiments, the vacuum level is between 1 micron and 200 microns. In some embodiments, the pressure level is between 1 micron and 300 microns. In some embodiments, the pressure level is between 100 microns and 200 microns. In some embodiments, the pressure level is between 100 microns and 300 microns. In some embodiments, the pressure level is between 200 microns and 300 microns. In some embodiments, the pressure level is represented in millibars. In some embodiments, the pressure level is 0.001 millibars.
  • the pressure level is 0.132 millibars. In some embodiments, the pressure level is 0.263 millibars. In some embodiments, the pressure level is 0.4 millibars. In some embodiments, the pressure level is between 0.001 millibars and 0.132 millibars. In some embodiments, the pressure level is between 0.001 millibars and 0.263 millibars. In some embodiments, the pressure level is between 0.001 millibars and 0.4 millibars. In some embodiments, the pressure level is between 0.132 millibars and 0.263 millibars. In some embodiments, the pressure level is between 0.132 millibars and 0.4 millibars.
  • the pressure level is between 0.263 millibars and 0.4 millibars. In some embodiments, the pressure level is about 1,000 microns. In some embodiments, the pressure level is between 900 microns and 1,000 microns. In some embodiments, the pressure level is about 1 atmosphere.
  • the internal atmosphere includes an inert gas atmosphere. In some embodiments, the internal atmosphere includes an argon atmosphere. In some embodiments, the vacuum induction furnace is configured to generate a vacuum (e.g., a vacuum of 100 microns) and then to fill the internal atmosphere with argon. In some embodiments, the vacuum induction furnace is configured to generate a vacuum (e.g., a vacuum of 100 microns) and then to fill the internal atmosphere with argon at a pressure level of about 1 atmosphere.
  • the parameters include a pour temperature.
  • the pour temperature is 700° C.
  • the pour temperature is 710° C.
  • the pour temperature is 720° C.
  • the pour temperature is 730° C.
  • the pour temperature is 740° C.
  • the pour temperature is 750° C.
  • the pour temperature is 755° C.
  • the pour temperature is 760° C.
  • the pour temperature is 768° C.
  • the pour temperature is 770° C.
  • the pour temperature is between 700° C. and 710° C.
  • the pour temperature is between 700° C. and 720° C. In some embodiments, the pour temperature is between 700° C. and 730° C. In some embodiments, the pour temperature is between 700° C. and 740° C. In some embodiments, the pour temperature is between 700° C. and 750° C. In some embodiments, the pour temperature is between 700° C. and 760° C. In some embodiments, the pour temperature is between 700° C. and 770° C. In some embodiments, the pour temperature is between 710° C. and 720° C. In some embodiments, the pour temperature is between 710° C. and 730° C. In some embodiments, the pour temperature is between 710° C. and 740° C.
  • the pour temperature is between 710° C. and 750° C. In some embodiments, the pour temperature is between 710° C. and 760° C. In some embodiments, the pour temperature is between 710° C. and 770° C. In some embodiments, the pour temperature is between 720° C. and 730° C. In some embodiments, the pour temperature is between 720° C. and 740° C. In some embodiments, the pour temperature is between 720° C. and 750° C. In some embodiments, the pour temperature is between 720° C. and 760° C. In some embodiments, the pour temperature is between 720° C. and 770° C. In some embodiments, the pour temperature is between 730° C. and 740° C.
  • the pour temperature is between 730° C. and 750° C. In some embodiments, the pour temperature is between 730° C. and 760° C. In some embodiments, the pour temperature is between 730° C. and 770° C. In some embodiments, the pour temperature is between 740° C. and 750° C. In some embodiments, the pour temperature is between 740° C. and 760° C. In some embodiments, the pour temperature is between 740° C. and 770° C. In some embodiments, the pour temperature is between 750° C. and 760° C. In some embodiments, the pour temperature is between 750° C. and 770° C. In some embodiments, the pour temperature is between 760° C. and 770° C.
  • the parameters include a hold time (i.e., a time period during which a charge received in the vacuum induction furnace is held at a target temperature and pressure once the target temperature and pressure have been reached).
  • the hold time is 0 minutes. In some embodiments, the hold time is 30 minutes. In some embodiments, the hold time is 60 minutes. In some embodiments, the hold time is 90 minutes. In some embodiments, the hold time is between 0 minutes and 30 minutes. In some embodiments, the hold time is between 30 minutes and 60 minutes. In some embodiments, the hold time is between 60 minutes and 90 minutes. In some embodiments, the hold time is between 0 minutes and 60 minutes. In some embodiments, the hold time is between 30 minutes and 90 minutes. In some embodiments, the hold time is between 0 minutes and 90 minutes. In some embodiments, the hold time is between 0 minutes and 90 minutes. In some embodiments, the hold time is between 0 minutes and 90 minutes. In some embodiments, the hold time is between 0 minutes and 90 minutes. In some embodiments, the hold time is between
  • step 150 the piece formed from the machining scrap in step 120 is placed within the vacuum induction furnace.
  • step 160 the vacuum induction furnace is operated to heat the machining scrap. In some embodiments, heating is performed as configured in step 140 .
  • lubricants are removed from the machining scrap.
  • lubricants are vaporized and are carried away from the machining scrap in the vacuum stream.
  • the lubricants are collected from the vacuum stream for subsequent use and/or disposal.
  • small amounts of the lubricants condense on the inside surface of the vacuum chamber.
  • lubricants are vaporized and oxidized.
  • the heating step includes heating to vaporize lubricants.
  • the step of heating to vaporize lubricants includes holding the machining scrap at a selected temperature and in a selected environmental composition for a time that is sufficient to vaporize the lubricants. In some embodiments, the time is about one hour.
  • the selected environment is a medium vacuum pressure (e.g., between 0.001 millibars and 30 millibars) and the temperature is a temperature that is greater than the boiling point of the lubricants at the selected pressure, but less than the solidus point of the machining scrap (e.g., about 660° C.). In some embodiments, the temperature is less than the boiling point of the lubricants at standard temperature and pressure (which is, for example, 370° C.).
  • the environment is an argon environment at about one atmosphere and the temperature is a temperature that is greater than the boiling point of the lubricants (which is, for example, 370° C. at standard temperature and pressure), but less than the solidus point of the machining scrap (e.g., about 660° C.).
  • the heating step includes heating to vaporize and oxidize lubricants.
  • the step of heating to vaporize and oxidize lubricants includes holding the machining scrap at a selected temperature and in a selected environmental composition for a time that is sufficient to vaporize the lubricants. In some embodiments, the time is about one hour.
  • the selected environment is a low vacuum pressure (e.g., between 30 millibars and 1000 millibars) and air environment and the temperature is a temperature that is greater than the boiling point of the lubricants at the selected pressure, but less than the solidus point of the machining scrap (e.g., about 660° C.). In some embodiments, the temperature is less than the boiling point of the lubricants at standard temperature and pressure (which is, for example, 370° C.).
  • the environment is an argon/air environment.
  • the argon/air environment includes between 0% and 100% argon and the balance air.
  • the temperature is a temperature that is greater than the boiling point of the lubricants (which is, for example, 370° C. at standard temperature and pressure), but less than the solidus point of the machining scrap (e.g., about 660° C.).
  • the environment is an air environment at or about atmospheric pressure and the temperature is a temperature that is greater than the boiling point of the lubricants (which is, for example, 370° C. at standard temperature and pressure), but less than the solidus point of the machining scrap (e.g., about 660° C.).
  • step 170 the vacuum induction furnace is operated to melt the machining scrap.
  • this step includes maintaining atmospheric conditions (e.g., pressure, atmospheric composition) that were used in step 160 .
  • this step includes changing atmospheric conditions.
  • this step includes continuing to heat the machining scrap (e.g., from a temperature at which lubricant is vaporized and/or oxidized, as discussed above with reference to step 160 ) until the machining scrap reaches its solidus point.
  • the melting step includes melting so as to vaporize and/or oxidize lubricant during the melting step.
  • the step of melting so as to vaporize and/or oxidize lubricant includes melting at a predefined environmental composition.
  • the environment is a low vacuum (e.g., between 30 millibars and 1000 millibars) and air environment and the temperature is a temperature at or above the solidus point of the machining scrap (e.g., about 660° C.).
  • the environment is an argon/air environment at a pressure of at or about atmospheric pressure and the temperature is a temperature at or above the solidus point of the machining scrap (e.g., about 660° C.).
  • the environment is an air environment at a pressure of at or about atmospheric pressure and the temperature is a temperature at or above the solidus point of the machining scrap (e.g., about 660° C.).
  • step 180 after the machining scrap is completely liquid, the temperature is raised to the level selected during step 140 , and is held at this prescribed level for the prescribed hold time. While the melted scrap is being held at this temperature, any contaminants (e.g., sodium, calcium, potassium, etc.) are vaporized and carried away from the melted scrap in the vacuum stream. In some embodiments, the contaminants, if any, are collected from the vacuum stream for subsequent use and/or disposal.
  • any contaminants e.g., sodium, calcium, potassium, etc.
  • step 190 the melted machining scrap is poured as needed (e.g., cast into a mold, fed into an ingot caster, etc.). It will be apparent to those of skill in the art that steps 150 through 190 may be repeated as necessary based on the amount of machining scrap at hand. Following step 190 , the method 100 is complete.
  • the material that is yielded by the operation of the vacuum induction furnace as described above has been cleaned of substantially all lubricant that was originally coated thereon.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes substantially no residual carbon.
  • the material that is yielded by the operation of the vacuum induction furnace includes 200 parts per million or less of residual carbon.
  • the material that is yielded by the operation of the vacuum induction furnace includes 190 parts per million or less of residual carbon.
  • the material that is yielded by the operation of the vacuum induction furnace includes 180 parts per million or less of residual carbon.
  • the material that is yielded by the operation of the vacuum induction furnace includes 170 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 160 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 150 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 140 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 130 parts per million or less of residual carbon.
  • the material that is yielded by the operation of the vacuum induction furnace includes 120 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 110 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes 100 parts per million or less of residual carbon. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes an amount of residual carbon that is equal to or less than an amount of residual carbon in an as-cast aluminum alloy.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes substantially no residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 25 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 24 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 23 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 22 parts per million or less of residual sodium.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes 21 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 20 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 19 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 18 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 17 parts per million or less of residual sodium.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes 16 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 15 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 14 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 13 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 12 parts per million or less of residual sodium.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes 11 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 10 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 9 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 8 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 7 parts per million or less of residual sodium.
  • the material that is yielded by the operation of the vacuum induction furnace as described above includes 6 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 5 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 4 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 3 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 2 parts per million or less of residual sodium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace as described above includes 1 parts per million or less of residual sodium.
  • the process described above is performed in the absence of flux (i.e., is flux-free).
  • the material that is yielded by the operation of the vacuum induction furnace retains substantially all lithium that was contained therein. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace retains substantially all alloy material that was contained therein prior to melting in the vacuum induction furnace. In some embodiments, little or no oxidation occurs.
  • the material that is yielded by the operation of the vacuum induction furnace includes between 0% and 0.4% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes between 0.4% and 0.8% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes between 0.8% and 1.2% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes between 1.2% and 1.6% lithium.
  • the material that is yielded by the operation of the vacuum induction furnace includes between 1.6% and 2.0% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes between 2.0% lithium and 2.4% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace includes between 2.4% lithium and 2.7% lithium. In some embodiments, the material that is yielded by the operation of the vacuum induction furnace is suitable for repeated commercial use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US16/860,301 2017-11-20 2020-04-28 Methods for recovering machining scrap Abandoned US20200255922A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/860,301 US20200255922A1 (en) 2017-11-20 2020-04-28 Methods for recovering machining scrap

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201762588752P 2017-11-20 2017-11-20
PCT/US2018/061928 WO2019100042A1 (fr) 2017-11-20 2018-11-20 Procédés pour récupérer des déchets d'usinage
US16/860,301 US20200255922A1 (en) 2017-11-20 2020-04-28 Methods for recovering machining scrap

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/061928 Continuation WO2019100042A1 (fr) 2017-11-20 2018-11-20 Procédés pour récupérer des déchets d'usinage

Publications (1)

Publication Number Publication Date
US20200255922A1 true US20200255922A1 (en) 2020-08-13

Family

ID=66539896

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/860,301 Abandoned US20200255922A1 (en) 2017-11-20 2020-04-28 Methods for recovering machining scrap

Country Status (6)

Country Link
US (1) US20200255922A1 (fr)
EP (1) EP3714076A4 (fr)
KR (1) KR20200078546A (fr)
CN (1) CN111356778A (fr)
CA (1) CA3080162A1 (fr)
WO (1) WO2019100042A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022159374A1 (fr) * 2021-01-19 2022-07-28 Arconic Technologies Llc Procédés de traitement de copeaux d'usinage comprenant un alliage d'aluminium-lithium
FR3126425A1 (fr) 2021-08-31 2023-03-03 Constellium Issoire Procédé de recyclage de scrap en alliage d’aluminium eco-responsable

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5931833A (ja) * 1982-08-16 1984-02-21 Mitsubishi Steel Mfg Co Ltd マルエ−ジング鋼スクラツプの再利用法
US5350438A (en) * 1991-05-23 1994-09-27 Toyota Jidosha Kabushiki Kaisha Method and apparatus for removing plated metal from steel sheet scraps
ATA212391A (de) * 1991-10-24 1994-09-15 Voest Alpine Ind Anlagen Verfahren zum entsorgen von organischen und anorganischen stoffen
JP3641279B2 (ja) * 1993-11-05 2005-04-20 日新製鋼株式会社 金属屑等の脱水方法およびその装置
US5364443A (en) * 1993-12-01 1994-11-15 Alcan International Limited Process for combined decoating and melting of aluminum scrap contaminated with organics
JP3552118B2 (ja) * 1994-07-29 2004-08-11 コスモリード株式会社 廃電池の処理方法
EP0694623A3 (fr) * 1994-07-29 1996-04-17 Teruhisa Ogihara Procédé pour le traitement de déchets métallifères
DE10128335C1 (de) * 2001-06-12 2002-11-21 Norsk Hydro Magnesiumgmbh Verfahren zum Reinigen und Wiedereinschmelzen von in feiner Form vorliegenden verunreinigten Leichtmetallen und Leichtmetall-Legierungen
FR2889541B1 (fr) * 2005-08-04 2007-09-28 Pechiney Rhenalu Sa Procede de recyclage de scrap d'alliages de type aluminium-lithium
FR2902800B1 (fr) * 2006-06-23 2008-08-22 Alcan Rhenalu Sa Procede de recyclage de scrap en alliage d'aluminium provenant de l'industrie aeronautique
US7776126B2 (en) * 2008-03-14 2010-08-17 Heritage Environmental Services, Llc Processing parameters for operation of a channel induction furnace
JP2009287863A (ja) * 2008-05-30 2009-12-10 Asahi Seiren Co Ltd 加熱処理装置
GB2477753B (en) * 2010-02-11 2012-04-18 Rifat Al Chalabi Metal recovery process
KR20150042018A (ko) * 2013-10-10 2015-04-20 공주대학교 산학협력단 진공용해 프로세스에 의한 희토류금속의 정련방법 및 그 제조장치
FR3023848B1 (fr) * 2014-07-16 2018-04-20 Constellium Issoire Procede de recyclage de scrap d'alliages de la serie 2xxx ou 7xxx

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022159374A1 (fr) * 2021-01-19 2022-07-28 Arconic Technologies Llc Procédés de traitement de copeaux d'usinage comprenant un alliage d'aluminium-lithium
FR3126425A1 (fr) 2021-08-31 2023-03-03 Constellium Issoire Procédé de recyclage de scrap en alliage d’aluminium eco-responsable
WO2023031546A1 (fr) 2021-08-31 2023-03-09 Constellium Issoire Procédé de recyclage de scrap en alliage d'aluminium eco-responsable

Also Published As

Publication number Publication date
EP3714076A4 (fr) 2021-06-02
KR20200078546A (ko) 2020-07-01
EP3714076A1 (fr) 2020-09-30
CA3080162A1 (fr) 2019-05-23
CN111356778A (zh) 2020-06-30
WO2019100042A1 (fr) 2019-05-23

Similar Documents

Publication Publication Date Title
US20200255922A1 (en) Methods for recovering machining scrap
US7550028B2 (en) Method for recycling aluminum-lithium-type alloy scrap
EP2038440B1 (fr) Procede de recyclage de scrap en alliage d'aluminium provenant de l'industrie aeronautique
JP6896623B2 (ja) 低窒素で実質的に窒化物を含まないクロム並びにクロム及びニオブ含有ニッケル基合金を製造するための工程、並びに結果物であるクロム及びニッケル基合金
US5913353A (en) Process for casting light metals
US20190338431A1 (en) High purity tin and method for manufacturing same
JP2016514212A5 (fr)
JP2002348621A (ja) マグネシウム合金材の純マグネシウム回収装置およびマグネシウム合金材のリサイクル方法
JP5572887B2 (ja) アルミニウム合金溶湯用マグネシウム濃度調整剤及びそれを用いたマグネシウム濃度調整方法
JP4409216B2 (ja) ターゲット材の再生方法
US20200377972A1 (en) Method for producing ti-al alloy
JP3673919B2 (ja) 高純度チタンの回収方法
JP2005097648A (ja) マグネシウム系合金廃材の回収方法
JP7412197B2 (ja) Ｔｉ－Ａｌ系合金の製造方法
SU873692A1 (ru) Способ получени лигатур алюминий-скандий
KR100526039B1 (ko) 마그네슘 스크랩의 진공증류 정제방법
WO2023182413A1 (fr) Procédé de fabrication d'un matériau de coulée en alliage de tial, matériau de coulée en alliage de tial, aube mobile pour moteur à réaction et roue de turbine
JP4004686B2 (ja) マグネシウム系廃材の再生方法
JP4270626B2 (ja) マグネシウム系材料のスクラップの再生利用方法
US3153602A (en) Treatment of vessels used for holding molten aluminum metal
US1160430A (en) Process of melting aluminum or aluminum alloys.
JPH06299260A (ja) マグネシウム切削屑の再生処理方法
JP3827547B2 (ja) 鉄スクラップからの銅の分離、除去方法
JP2003293051A (ja) 低融点金属および高融点金属を含有するＴｉ合金の製造方法
JP2002173718A (ja) アルミニウム処理方法

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION