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| Number | Title | Issue Date |
| 8016912 | Process for recovering platinum group metals using reductants In the process of recovering platinum group metals from platinum group metal- and base metal-containing materials, the present invention uses reductants and a sulfur-deficient matte to aide the separation of the furnace matte from the furnace slag and therefore impr... | 09/13/2011 |
| 7645320 | Extraction process A process for extracting a precious metal from a precious metal containing source is provided comprising the steps of: —(i) contacting the precious metal-containing source with a vapor phase chloride salt; (ii) condensing the precious metal containing volatile pro... | 01/12/2010 |
| 7351390 | Method and installation for heat treating carbon bodies containing sodium Carbon bodies are heated in an oven under low pressure and while being swept with an inert gas, gaseous effluent containing elemental or compound sodium in sublimed form being continuously extracted from the oven via an effluent exhaust pipe. At least one sodium-neu... | 04/01/2008 |
| 7323153 | Reprocessing method by fluoride volatility process using fractional distillation Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and recovering the fluorides using a difference in volatility behavior. The method includes steps of: subjecting a mixture of UO2 | 01/29/2008 |
| 7253076 | Methods for forming and integrated circuit structures containing ruthenium and tungsten containing layers Capacitors having increased capacitance include an enhanced-surface-area (rough-surfaced) electrically conductive layer or other layers that are compatible with the high-dielectric constant materials. In one approach, an enhanced-surface-area electrically conductive... | 08/07/2007 |
| 7066981 | Assaying method The invention provides a method of assaying a mineral sample for determining the concentration of selected metals in a sample comprising the steps of providing a comminuted mineral sample; mixing such sample with a flux; preheating a reaction vessel to a temperature... | 06/27/2006 |
| 7052643 | Method and an installation for subjecting carbon fabrics to high temperature heat treatment and to densification by chemical vapor infiltration Heat treatment is performed on preforms placed in an enclosure accompanied by sweeping with an inert gas under reduced pressure, and with a gaseous effluent being exhausted continuously via a first effluent outlet connected to an effluent exhaust circuit. At the end... | 05/30/2006 |
| 6663728 | Gold-free platinum material dispersion-strengthened by small, finely dispersed particles of base metal oxide A gold-free platinum material that is dispersion-strengthened by small, finely dispersed particles of base metal oxide. The base metal is either 0.01-0.5 wt. % Sc or a mixture/alloy of Sc and at least one metal from the group consisting of Zr, Y, and Ce w... | 12/16/2003 |
| 6626978 | Method for dressing materials A material benefication process and device for dressing a material comprising noble metals including platinum group metals. The device includes a reactor vessel with an inlet and an outlet for the processing medium. The material to be processed and a hold... | 09/30/2003 |
| 6461400 | Process for extracting quantities of precious metals A method of extracting amounts of precious metals from target materials. The target material in particulate form is mixed with particulate copper and coarse-ground wheat flour and roasted at least once in an induction furnace. The roasted mixture is trans... | 10/08/2002 |
| 6458183 | Method for purifying ruthenium and related processes The present invention provides a method for purifying ruthenium sources to obtain high purity ruthenium metal without the need for high temperature processing, expensive reagents, complex series of wet processes, or expensive equipment. According to the p... | 10/01/2002 |
| 6344067 | Refining Precious metal-containing concentrates are subjected to high temperature chlorination using HCl gas, an optional reduction, an oxidation and finally a reduction, to remove most of the base metals especially the amphoteric elements.... | 02/05/2002 |
| 6284013 | Method for preparing high-purity ruthenium sputtering target and high-purity ruthenium sputtering target There is provided a high-purity ruthenium sputtering target with a low impurity content, in particular producing extremely few particles, which is suitable for applications such as the formation of semiconductor thin films. The high-purity ruthenium sputt... | 09/04/2001 |
| 5279644 | Fire refining precious metals asay method A new environmentally safe fire refining precious metal assay method is provided wherein bismuth oxide is used with a special flux composition as the precious metal collector and the cupelling procedure is performed in a controlled temperature range.... | 01/18/1994 |
| 5238485 | Method for the assay and recovery of precious metals Complex ores of the precious metals which also contain iron spinels and similar compounds are assayed and their precious metals content is extracted by subjecting the ores or concentrates thereof together with an iron-embrittling agent to a pyrometallurgi... | 08/24/1993 |
| 5076839 | Precious metal refining with fluorine gas Feed mixtures containing one or more platinum group metals are fluorinated to form at least one volatile fluoride product which is separated from the residual solid. Separations of different fluorides may be effected by collecting different fractions of v... | 12/31/1991 |
| 5030274 | Method for recovering metallics and non-metallics from spent catalysts An electric arc furnace includes a crucible having a metal shell for recovering precious metals from spent material. The shell includes a metal tap hole and a slag door positioned above and opposite the metal tap hole. A removable swinging roof is provide... | 07/09/1991 |
| 4913736 | Process for recovering platinum group metals A process for recovering Platinum Group metals from material comprising one or more Platinum Group metals and one or more Group IA metals supported on carbon comprises heating at a temperature between 700° C. and 1150° C. in a stream of an inert gas or ... | 04/03/1990 |
| 4902342 | Method for the manufacture of non-allergy creating precious metal objects A method and an apparatus for the manufacture of non-allergy creating objects, especially objects of metal for direct contact with the skin of a human body, for instance jewelery, watches, glasses etc. whereby completely pure metals, especially precious m... | 02/20/1990 |
| 4826666 | Method of preparing metal carbides and the like and precursors used in such method Preparation of metal carbides, nitrides, borides, silicides and phosphides, also metal alloys and pure metals, by providing a precursor in which there are organic ligands bonded to the metal or metals, such precursor having the element X also bonded direc... | 05/02/1989 |
| 4734129 | Recovery of metals from their alloys with lead using consummable lance and apparatus A metal, especially silver, may be recovered from its alloy with lead by a method comprising injecting, into the molten alloy, an oxygen-containing gas to oxidize the lead to form lead oxide slag and removing the slag from the molten metal. The oxygen-con... | 03/29/1988 |
| 4705562 | Method for working-up waste products containing valuable metals The invention relates to a method for working-up valuable metal-bearing waste products, particularly but not exclusively copper scrap, containing a substantial amount of organic constituents, to a product form suitable for recovering the valuable-metal co... | 11/10/1987 |
| 4695317 | Method of treating silicate ore containing gold and silver A silicate ore containing gold and silver is melted with the slag from a copper converter and a reducing agent. A source of CaO may also be added to the slag so that the treated slag may contain at least 3.0% by weight of CaO. Copper is recovered from the... | 09/22/1987 |
| 4657586 | Submerged combustion in molten materials A process for heating a molten material by injecting oxygen and a fuel into a molten bath of the material at a bath temperature above the spontaneous combustion temperature of the fuel, at least a portion of the fuel forming a shroud around the oxygen, an... | 04/14/1987 |
| 4608083 | Method for recovering the valuable metal content of contaminated copper raw material The invention relates to a method for recovering the valuable metal content of a mix of contaminated copper raw materials, of which materials at least one is sulphide bearing, and which contain one or more impurities forming the group arsenic, antimony, b... | 08/26/1986 |
| 4581064 | Treatment of anode slimes in a top blown rotary converter A process for treating anode slimes originating from copper, lead or nickel electrorefining to recover the precious metals contained therein is disclosed. The process comprises the steps of charging the slimes into a tiltable and rotatable top blown rotar... | 04/08/1986 |
| 4511539 | Recovery of precious metal The invention relates to the recovery of precious metal lost from precious metal-containing catalysts for example the precious metal-containing catalysts which are used in the production of nitric acid by ammonia oxidation. In more detail, a getter (as he... | 04/16/1985 |
| 4466827 | Method for melting metals Metal is melted in melting vessels heated in a melting furnace by combustion of fuel and by exhaust gases from the combustion. In order to prevent evaporation, overheating and contamination of the melt, the exhaust gases of the melting furnace, including ... | 08/21/1984 |
| 4451290 | Recovery of platinum group metals from scrap and residues A process for the recovery of platinum group metals, Ag and Au from a precious metal containing residue which includes the platinum group metals, Ag and Au together with Fe, Cu, Ni, Se and Te, the process comprising the following steps: (a) smelting the p... | 05/29/1984 |
| 4448604 | Recovery of precious metals from leach residues This invention relates to the recovery of platinum group metals and Au and Ag from high sulphur content base metal sulphide ore residues and also to the separation of Ag from the other precious metals referred to. The process for the recovery of platinum group... | 05/15/1984 |
| 4397686 | Method for refining precious metals A method for economically removing base metal impurities, other oxidizable impurities, and volatile impurities from precious-metal-bearing metallic materials, consisting of silver and gold, to obtain, with high recovery, a resultant precious metal of high... | 08/09/1983 |
| 4388110 | Method for recovering the metal content of complex sulphidic metal raw materials The metal content of complex sulphidic metal raw material is recovered therefrom by means of an autogenous flame-smelting process, preferably carried out in a vortex, with an oxygen-containing gas. The raw materials are smelted in a furnace in the presenc... | 06/14/1983 |
| 4337085 | Recovery of precious metals from spent alumina-containing catalysts The invention relates to the recovery of precious metals which is accomplished by melting an alumina-containing spent catalyst having therein a minor amount of a precious metal. The melted alumina containing carrier material is heated to about 2100° C. i... | 06/29/1982 |
| 4135923 | Extraction of metals This invention relates to the extraction of metals. More particularly, the invention is concerned with the extraction of one or more precious metals from material containing such metals. By "precious metals", both here and throughout the remainder of this... | 01/23/1979 |
