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
  • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
  • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
  • C22B9/106—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents the refining being obtained by intimately mixing the molten metal with a molten salt or slag
• • 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
  • C22B26/20—Obtaining alkaline earth metals or magnesium
  • C22B26/22—Obtaining magnesium
• • 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
  • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
• • 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
  • C22B21/062—Obtaining aluminium refining using salt or fluxing agents
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/20—Recycling

Definitions

• the invention relates to a salt composition for protecting, refining and/or recycling molten magnesium or magnesium alloys, which at the same time can be used as a fire extinguisher.
• New die cast magnesium alloys containing Sr (AJ alloys) and/or Ca (AX alloys) are interesting for high temperature automotive applications for example within the powertrain segment.
• Sr containing alloys traditional salt of the MgCl2-CaCl2-NaCl system that e.g. is used for melt protection and fire extinguishing cannot be used. This is due to the thermodynamic stability of SrCl2. If an Sr containing alloy is in contact with a salt of this type, Sr in the alloy will react with MgCl2 in the salt phase forming SrCl2, with significant depletion of Sr in the alloy as a result. If all MgCl2 is reacted before the alloy is free of Sr, NaCl2 will be the next to react, causing Na contamination in the alloy. Alloys with Ca behave exactly similar.
• the present invention relates to a salt composition which is equally or more thermodynamic stable than the known salt compositions and which can be used in combination with the above mentioned alloys, and as a fire extinguisher.
• this can be achieved by using a salt composition which consist of halogenides of strontium, potassium, cesium or mixtures thereof.
• the salt composition is a chloride and/or fluoride.
• the different ions of the salt composition a present in the following amounts: 33-47 wt-% Sr 2 + 14-38 wt-% K+ 26-39 wt-% Cl ⁇ 0.5-1.3 wt-% F ⁇
• the salt composition consists of: 48-75 wt-% SrCl2 20-45 wt-% KCl 2-6 wt-% KF, and 0-30 wt-% CsCl
• the binary KCl-SrCl2 salt has several eutectics, the one with lowest melting point, 584° C., at 42.5 at % SrCl2, which corresponds to 66 wt % SrCl2.
• compositions close to the eutectic with lowest melting point is beneficial, as it will e.g. protect molten alloy from oxidation at temperatures from the melting point of the salt and upwards.
• SrCl2-KGI salts with a composition close to the 66 wt % SrCl2 eutectic were prepared, solidified and crushed.
• Ingots of AJ62 (Mg—6 wt % Al—2.5 wt % Sr) were melted in two identical steel crucibles simultaneously, and the SrCl2-KGI salt was added for protection.
• the AJ62 alloy started to melt before the salt starts melting, some oxidation was observed before the salt started to melt. However, once the salt melted (at 584° G) it completely covered the alloy and stopped the oxidation. It was observed that due to its much higher density some drainage of salt along the crucible walls occurred.
• bursting of salt pools at the metal-salt interface could also take place.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Manufacturing & Machinery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
• Processing Of Solid Wastes (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=34960257

Family Applications (1)

Country Status (10)

Cited By (1)

Family Cites Families (1)

• 2005
  • 2005-01-21 CA CA 2565563 patent/CA2565563A1/fr not_active Abandoned
  • 2005-01-21 EA EA200602224A patent/EA200602224A1/ru unknown
  • 2005-01-21 PL PL05706954T patent/PL1786938T3/pl unknown
  • 2005-01-21 EP EP20050706954 patent/EP1786938B1/fr not_active Not-in-force
  • 2005-01-21 WO PCT/EP2005/000586 patent/WO2005118891A2/fr active IP Right Grant
  • 2005-01-21 DE DE200560009551 patent/DE602005009551D1/de not_active Expired - Fee Related
  • 2005-01-21 AT AT05706954T patent/ATE407228T1/de not_active IP Right Cessation
  • 2005-01-21 CN CNA2005800182155A patent/CN101035915A/zh active Pending
  • 2005-01-21 US US11/628,336 patent/US20070214910A1/en not_active Abandoned
• 2006
  • 2006-12-04 NO NO20065569A patent/NO20065569L/no not_active Application Discontinuation

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