US1720286A - Process for the protection of the surface of baths of easily-oxidizable metals such as magnesium - Google Patents

Process for the protection of the surface of baths of easily-oxidizable metals such as magnesium Download PDF

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Publication number
US1720286A
US1720286A US126727A US12672726A US1720286A US 1720286 A US1720286 A US 1720286A US 126727 A US126727 A US 126727A US 12672726 A US12672726 A US 12672726A US 1720286 A US1720286 A US 1720286A
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magnesium
protection
baths
crust
oxidizable metals
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US126727A
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Michel Gilbert
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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
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium

Definitions

  • the present invention has for its object a process for the protection of the surface of baths of easily .oxidizable metals consisting essentially in distributing sulphur, not directly upon the metallic surface, but upon a layer of a protective substance which itself forms a protecting crust, such for instance as the fluoride of the metal under consideration.
  • the invention may be carried into effect by way of example in the following manner inby the addition the case of molten magnesium.
  • a protective crust of magnesium fluoride is formed on the surface of the molten metal. This constitutes a solid crust which floats on the surface and constitutes in itself a good protection for the metal. Pulverulent sulphur is then sprinkledupon the protecting layer where it melts and burns slowly, since the crust of fluoride has a much lower temperature than the molten metal and obviously the crust is not a good conductor of heat. 1 a
  • magnesiumfluoride may be replaced by other fluorides or even chlorides. It may,
  • n l A method of protecting the surface of a bath of easily oxidizable metal which consists in covering the free surface of the bath with a protective layer and covering the crust so formed with sulphur.
  • A. method of protecting the surface of. a bath of easily oxidizable metal which consists in covering the free surface of the bath with a protective layer ofthe fluoride of the said metal and covering the crust so formed with sulphur.

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

Description

Patented July 9, 1929.
21; sir
maze
FATE
GILBERT Mrcnnn or BAGNEUX, FRANCE.
PROCESS FOR THE PROTECTION OF- ;mE SURFACE .01? BATHS or EASILY-OXIDIZABLE METALS soon as MAGNESIUM.
No Drawing. Application filed August 2, 1926,.Serial No. 126,727, and in France August 18, 1925.
Application-for French patent has been filed on Aug. 18, 1925, and for'British patent has been filed on Feb. 10, 1926. a
The present invention has for its object a process for the protection of the surface of baths of easily .oxidizable metals consisting essentially in distributing sulphur, not directly upon the metallic surface, but upon a layer of a protective substance which itself forms a protecting crust, such for instance as the fluoride of the metal under consideration.
; Itthus embraces the employment, of magnesium fluoride, for forming the protective crust on a bath of molten magnesium.
The invention may be carried into effect by way of example in the following manner inby the addition the case of molten magnesium.
A protective crust of magnesium fluoride is formed on the surface of the molten metal. This constitutes a solid crust which floats on the surface and constitutes in itself a good protection for the metal. Pulverulent sulphur is then sprinkledupon the protecting layer where it melts and burns slowly, since the crust of fluoride has a much lower temperature than the molten metal and obviously the crust is not a good conductor of heat. 1 a
On account of this the evolution of 5111-. phurous gas becomes so slow that the operator. is not incommoded thereby and, in addition,- direct contact of the sulphur with the metal being avoided, the formation of sulphides and oxy-sulphides need not be feared.
It must be understood that the protective layer of magnesiumfluoride may be replaced by other fluorides or even chlorides. It may,
- sium inthe form of a crust for the protection of light metals, both With and without the creation of a neutral surrounding atmosphere '5 of sulphur.
I claim: n l. A method of protecting the surface of a bath of easily oxidizable metal which consists in covering the free surface of the bath with a protective layer and covering the crust so formed with sulphur.
2. A. method of protecting the surface of. a bath of easily oxidizable metal Which consists in covering the free surface of the bath with a protective layer ofthe fluoride of the said metal and covering the crust so formed with sulphur. 3. A method of protecting the surface of a bath of molten magnesium, which consists in 7 covering; the free surface of the bath with a protective layer of magnesium fluoride, and covering the crust so formed with sulphur.
In testimonywvhereof I'afiix my signature.
GILBERTMICHEL.
US126727A 1925-08-18 1926-08-02 Process for the protection of the surface of baths of easily-oxidizable metals such as magnesium Expired - Lifetime US1720286A (en)

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FR1720286X 1925-08-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400752A (en) * 1966-12-02 1968-09-10 Magnesium Elektron Ltd Treatment of readily oxidisable metals
US5037472A (en) * 1990-10-02 1991-08-06 W. R. Grace & Co.-Conn. Compartmented insulation blanket and method of use

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400752A (en) * 1966-12-02 1968-09-10 Magnesium Elektron Ltd Treatment of readily oxidisable metals
US5037472A (en) * 1990-10-02 1991-08-06 W. R. Grace & Co.-Conn. Compartmented insulation blanket and method of use

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