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| Number | Title | Issue Date |
| 7763095 | Internal gettering by metal alloy clusters The present invention relates to the internal gettering of impurities in semiconductors by metal alloy clusters. In particular, intermetallic clusters are formed within silicon, such clusters containing two or more transition metal species. Such clusters have meltin... | 07/27/2010 |
| 7655066 | Nitrogen removal from molten metal by slags containing titanium oxides The invention relates to titanium oxide containing slag compositions and associated methods for reducing the nitrogen content of metals. The titanium oxide slag compositions can be used to reduce nitrogen content in various molten metals including steel, nickel, cop... | 02/02/2010 |
| 6971276 | Recovery of purified volatile metal such as lithium from mixed metal vapors The present invention is concerned with a method for extracting selectively a metal from a metal mixture in the gaseous phase. The method comprises heating the metal mixture to vaporize the metal; condensing the metal contaminants present in the vapor; reacting any ... | 12/06/2005 |
| 6932853 | Mechanical separation of volatile metals at high temperatures A method of operating mechanical separation devices at high temperatures to separate various volatile metals, metal halides and metal oxides to produce high purity materials. ... | 08/23/2005 |
| 6458182 | Process for producing high-purity Mn materials A process for producing a high-purity Mn material comprising the steps of premelting crude Mn at 1250-1500° C. and vacuum distilling the melt at 1100-1500° C. The degree of vacuum during the vacuum distillation ranges from 5×10-6 torr to 10 ... | 10/01/2002 |
| 6086652 | Method and apparatus for initial purification of liquid metal heat exchange fluid A method for removing oxides from a liquid metal heat exchange fluid following the initial startup of the heat exchange system fixes oxygen by locating an oxygen scavenging material in a drain tank. During initial fabrication and periods of maintenance me... | 07/11/2000 |
| 5573574 | Electrorefined aluminium with a low content of uranium, thorium and rare earths A process for obtaining aluminum of purity above 99.998%. A liquid aluminum raw material is subjected to a fractional crystallization to obtain prepurified aluminum crystals in a yield of between 50 and 80% and a liquid aluminum portion of lesser purity. ... | 11/12/1996 |
| 5336294 | Removal of contaminants from molten metals Particles or inclusions are removed from a molten alloy by contacting the molten alloy with a material selected from the group consisting of aluminium silicate, magnesium silicate, zirconium oxide or a mixture of alumina-calcia and alumina-magnesia.... | 08/09/1994 |
| 4601460 | Technique for removing impurities from a copper melt A copper or copper alloy material having a reduced number of defects is formed by removing impurities from the material while in a molten state with a member having exposed silicon carbide particles. The member may be a bed filter formed from bed media ha... | 07/22/1986 |
| 4144054 | Process for the removal of impurities from aluminum melts The process for removing impurities, in particular for removing sodium chloride from aluminum melts, employs reactive chlorine which is introduced into the melt and then passes with the melt through a filter bed. Aluminum chloride formed by the reaction o... | 03/13/1979 |
| 4138245 | Process for the removal of impurities from aluminum melts Sodium is removed from aluminum by introducing a gaseous chlorinating agent for molten aluminum into a body of molten aluminum which has a content of sodium and passing the resulting mixture through a filter which carries a liquid metal chloride coating a... | 02/06/1979 |
| 4067731 | Method of treating molten metal A method of treating molten aluminum and aluminum alloys to remove solid and gaseous impurities therefrom is disclosed. Molten metal is flowed through an integrated series of successively arranged purification stages including a deslagging stage wherein r... | 01/10/1978 |
