Separation Of Unwanted Component From Melt Patents (Class 164/134)
  • Patent number: 4368834
    Abstract: A tundish provided with at least one stopper which moves towards or away from a casting outlet formed in the bottom tundish wall and with a burner placed in the vicinity of the outlet essentially comprises at least one casing which is placed around the casting outlet in such a manner as to surround the stopper at least to a partial extent and which can be put into communication with the burner.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: January 18, 1983
    Assignee: Daussan et Compagnie
    Inventors: Jean-Charles Daussan, Gerard Daussan, Andre Daussan
  • Patent number: 4190404
    Abstract: Nonmetallic inclusions and like contaminants are removed from a metal charge by melting the charge to form a molten pool on which the inclusion contaminants float and directing an electron beam onto a preselected first portion of the pool surface, said selective beam impingement causing the floating contaminants to segregate to other portion not subjected to beam impingement. Removal of molten metal from the impinged surface portion while the inclusion contaminants are confined elsewhere on the pool surface provides a clean molten metal product. Apparatus for use with the process is also disclosed. The invention finds special application in the master melting or remelting of metals and alloys for conversion to ingot shapes or high purity molten metal for powder making, investment casting, forging and the like.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: February 26, 1980
    Assignee: United Technologies Corporation
    Inventors: Kenneth E. Drs, Sebastian J. Salafia, Lee F. Schulmeister
  • Patent number: 4186791
    Abstract: The process includes the delivery of molten metal for solidification in stepped flow and the blowing of a gas through the flow at a step located at the level of the surface of that portion of the flow which is directly fed for solidification, or at a level exceeding said level by as much as 300 mm.The apparatus for realizing said process comprises a tundish with a stepped bottom. A means for blowing the gas through the flow of metal is provided within that portion of the tundish which is located level with the upper generatrix of the outlet from the tundish or preferably, at a level about 300 mm above said generatrix.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: February 5, 1980
    Assignees: Ukrainsky Nauchno, Nauchno Proizvodstvennoe
    Inventors: Vladimir T. Sladkoshteev, Oleg A. Shatagin, Samuil F. Khalemsky, Eleonora B. Besedina
  • Patent number: 4154289
    Abstract: A gating system of general application for pouring foundry molds by gravity, based on a distinct prefabricated casting skin-strainer, located along and following the casting surface, structurally constructed and mold supported to withstand the impact of falling molten metal and the consequent metalistatic pressure, all while the cavity is filled through a skin-strainer aperture and with the skin-strainer retaining its original position and shape. The skin-strainer is able, when necessary, to allow the feeding of the casting once the mold is full and before it is solidified. Depending on the casting to be poured the system may include an overhead melt distributor, and techniques for mold casting cavity venting and sprue-feeder extraction.
    Type: Grant
    Filed: April 6, 1976
    Date of Patent: May 15, 1979
    Assignee: Marie-Therese Simian
    Inventor: Miguel Jeanneret
  • Patent number: 4125146
    Abstract: There is disclosed a continuous casting process in which contaminants from a metal melt are separated out by forcing the metal melt to undergo a rotating turbulent flow before it is cast. The desired rotating turbulent flow is achieved by disposing a suitable chamber, through which the melt flows, between the ladle and the mould.
    Type: Grant
    Filed: November 24, 1976
    Date of Patent: November 14, 1978
    Inventors: Ernst Muller, Adolf Trautwein
  • Patent number: 4119136
    Abstract: A method of recovering tin from tin dross consisting of positioning a barrel having an apertured bottom and charged with a supply of the tin dross upon a partitioned collecting tin mold, with the components thus arranged being placed into a furnace for subjecting the components and tin dross charge to a temperature approximating 700.degree. F for a time duration approximating 5 - 6 hours and allowing the developed molten free tin to flow downwardly of the barrel and through the apertures thereof and into and between the partitions of the collecting tin mold, and withdrawing the collecting tin mold for cooling before removing the cast tin bars therefrom. The apparatus aspect relates to the design of the barrel and collecting tin mold.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: October 10, 1978
    Inventor: Robert Martin Gancarz, Sr.
  • Patent number: 4049373
    Abstract: An apparatus for producing compact polycrystalline ingots of materials such as InP, GaP and GaAs having a defined geometric form is provided comprising a reaction boat having a plurality of melting pots formed therein, said melting pots having the shape of a single crystal melting crucible and at least one connecting canal communicating with said melting pots.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: September 20, 1977
    Assignee: Siemens Aktiengesellschaft
    Inventor: Klaus Zeuch
  • Patent number: 4016925
    Abstract: A method for continuously manufacturing an endless lead sheet from which a cathode starting sheet to be used in electrolytic refining of lead is prepared are disclosed. In the present method, molten lead is continuously introduced into a first separation zone where dross is caused to come up to the surface and separated from the molten lead, mixture of the dross and the molten lead in the vicinity of the melt surface is introduced into a second separation zone through a wide flow path, and the molten lead substantially free from the dross is introduced into a casting zone while the dross is accumulated on the liquid surface in the second separation zone. In the present apparatus, there is provided in a casting tank a dish surrounding a bottom of a rotary cooling drum, which dish includes a laterally extending, shallow cutout at an upper end thereof. An adjustable gate device is provided between the cutout and the bottom of the drum.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: April 12, 1977
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventor: Tokunobu Sumida
  • Patent number: 3998261
    Abstract: In the bottom pouring of steel ingots, the molten steel is teemed into a trumpet or upstanding runner and passes from the trumpet through a horizontal runner and up into an ingot mould. Inert gas is injected into the molten steel as it passes downwardly through the trumpet so that bubbles are formed in the steel, which bubbles assist in the removal of non-metallic inclusions. This process is used in the manufacture of steel ingots of very low non-metallic inclusion content and low total oxygen content.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: December 21, 1976
    Assignee: British Steel Corporation
    Inventor: Rodney Barker
  • Patent number: 3981352
    Abstract: A system for the casting of metal comprising a filter through which the metal passes during pouring into a mold cavity. The filter is formed by providing a multiplicity of substantially spherical refractory particles. A ceramic binder is employed for securing the particles in a bonded assembly, the binder substantially completely coating the particles. Openings are defined between the adjoining coated particles to permit the flow of molten metal through the filter. The binder is of a type having an affinity for dross and slag constituents in the molten metal whereby the constituents are removed during passage of the metal through the filter. The refractory particles are preferably bonded into an assembly by processing which includes coating the particles with the binder material, introducing the coated particles into a mold and drying and firing the coated particles in the mold to achieve the desired bonded relationship.
    Type: Grant
    Filed: November 21, 1975
    Date of Patent: September 21, 1976
    Assignee: Howmet Corporation
    Inventors: John I. Nurminen, David H. Sturgis
  • Patent number: 3972368
    Abstract: A method comprising the steps of casting molten nonferrous metal ingots, skimming scum foaming on the surface of the molten metal in each mold, cooling the molds to release ingots therefrom, stacking the ingots released from the molds to form ingot stacks each comprising a plurality of layers of ingots arranged in vertically stacked relation alternately in two different patterns, weighing the ingot stacks, and tightly binding the weighed ingot stacks with steel bands.
    Type: Grant
    Filed: October 9, 1974
    Date of Patent: August 3, 1976
    Assignees: Hachinohe Smelting Co., Ltd., Mitsui Kinzoku Engineering Service Co., Ltd., Mitsui Mining & Smelting Co., Ltd.
    Inventors: Takahiro Kikkawa, Toshinori Hirata, Waichi Miyaji, Kouichi Tokunaga, Hidetosi Otu, Mikiya Tanigawa, Yasuhiro Yamazaki
  • Patent number: 3934755
    Abstract: A method of preventing slag from escaping when emptying a pouring vessel with a bottom outlet. The vessel contains steel and slag. During the end phase of the emptying of the pouring vessel, between the discharge opening and the interior space of the vessel a barrier of liquid steel is built up by passing the steel through a system of communicating flow paths surrounding the discharge opening. Thus the steel is caused with the remainder of its content in the vessel prior to the discharge of this remainder from the vessel, due to its greater specific weight automatically to prevent the lighter slag from entering the system and to reach the discharge opening. The vessel for practicing the above mentioned method has its discharge opening surrounded by a groove-shaped recess, the lowermost portion of which is located below the level of the upper edge of the discharge opening. A wall annularly extends from above into the recess without contacting the lowermost portion of the recess.
    Type: Grant
    Filed: April 3, 1974
    Date of Patent: January 27, 1976
    Assignee: Thermo-Industrie GmbH & Co. KG
    Inventors: Paul Rheinlander, Heinz Voigt