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| Number | Title | Issue Date |
| 7972412 | Process for recovering platinum group metals from ores and concentrates A method for recovering at least one platinum group metal (PGM) species from a feed product selected from the group consisting of chromite ore, chromite ore concentrate and PGM concentrate comprising the steps of: mixing the feed with at least one salt so as to prod... | 07/05/2011 |
| 7951223 | Method of separating rhodium from platinum and/or palladium A method of separating rhodium from platinum and/or palladium includes; chloridizing a raw material including rhodium and at least platinum and/or palladium in chlorine atmosphere and obtaining a soluble salt of platinum and/or palladium; water-leaching chloridized ... | 05/31/2011 |
| 7422621 | Method for concentrating precious metals contained in leaching residue discharged from copper hydrometallurgical process A method for concentrating precious metals contained in the leaching residue discharged from a copper hydrometallurgical process by removing pyrite from the residue. A method for concentrating precious metals in the leaching residue containing pyrite, elementary sul... | 09/09/2008 |
| 7262330 | Process of producing aldehydes A process of producing aldehydes in a continuous hydroformylation process of continuously reacting an olefinic unsaturated compound with carbon monoxide and hydrogen in the presence of a rhodium-phosphite based complex catalyst and continuously separating at least o... | 08/28/2007 |
| 6923922 | Recover and recycle rhodium from spent partial oxidation catalysts A method for the recovery of rhodium from spent supported catalysts. In one embodiment, a method for recovering rhodium from a host material includes roasting the host material in air at a temperature sufficient to convert at least a portion of rhodium to Rh2 | 08/02/2005 |
| 6800111 | Method for recovering catalytic metals A method for recovering catalytic metals from compositions containing catalytic metal colloids. Compositions such as rinse solutions or dragout baths containing catalytic metal colloids are passed through a filter that entraps catalytic metal colloids from the solut... | 10/05/2004 |
| 6797033 | Method for recovering catalytic metals A method for recovering catalytic metals from fluids containing catalytic metal colloids. Fluid compositions such as rinse solutions or dragout baths containing catalytic metal colloids are passed through a filter that entraps catalytic metal colloids on the filter.... | 09/28/2004 |
| 6773485 | Method for recovering catalytic metals using a porous metal filter A method for recovering catalytic metals from fluid compositions containing catalytic metal colloids. Fluid compositions such as aqueous rinse solutions or dragout baths containing catalytic metal colloids are passed through a porous metal filter that entraps the ca... | 08/10/2004 |
| 6596245 | Process for the recovery and refining of rhodium The present invention relates to a process for the recovery and refining of rhodium starting from a mixture containing rhodium and other transition metals, including those of the platinum Group, as well as metals of the main Groups, said process comprisin... | 07/22/2003 |
| 6428602 | Method for recovering platinum from platinum-containing coatings on gas turbine engine components A method for recovering Pt from Pt-bearing coating on a gas turbine engine component. The component is contacted with a chemical stripping agent to dissolve away constituents of the coating and produce a Pt-bearing film of acid oxidation products at the s... | 08/06/2002 |
| 5797977 | Method of platinum recovery A neutralizing reagent is added to a solution of chloroplatinic acid containing impurities to adjust the pH value of the solution to 5.5-7.0, the insoluble impurity compounds that precipitated in this first neutralization step is filtrated off, a neutrali... | 08/25/1998 |
| 5769925 | Process for the elution of precious metals absorbed on active carbon A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.... | 06/23/1998 |
| 5622615 | Process for electrowinning of copper matte A sulfur dioxide free process for the production of high purity metallic copper from copper-matte wherein copper-matte is leached under oxidizing conditions in a ferric-containing acid copper sulfate electrolyte leach assembly including one or more leach ... | 04/22/1997 |
| 5364445 | Recovery method of rhodium A method for recovering rhodium comprising the steps of: adding a basic compound to an organic solution containing a rhodium complex containing at least one type of organophosphorus compound as a ligand and an organophosphorus compound, combusting the res... | 11/15/1994 |
| 5302183 | Recovery of precious metals from catalyst residue The invention relates to a process for recovering a precious metal, particularly palladium, from a non-aqueous effluent comprising the metal and dissolved salt and/or polyether contaminants, wherein the effluent is contacted with a reduction agent, the pr... | 04/12/1994 |
| 5208194 | Recovery of group VIII transition metals from organic solutions using acidic ion-exchange resins A process for recovering a Group VIII metal from an organic solution is disclosed. The organic solution is contacted with an acidic ion exchange resin that has sulfonic acid active groups. The invention provides an effective and economical way to recover ... | 05/04/1993 |
| 5205858 | Precious metals recovery process Standard cyanide-extraction techniques are coupled with carbon adsorption to facilitate the recovery of precious metals. The carbon is in the minus eighty mesh size range and is removed from a slurry by flotation. The loaded carbon is then dried and destr... | 04/27/1993 |
| 5131943 | Process for the separation of precious group VIII a metals from cyano complexes of such metals and other metals A mixture of cyanide complexes with certain Group VIII metals and other metals is passed in contact with solid subdivided cross-linked polyvinylpyrrolidone whereby the Group VIII metals--platinum, palladium, rhodium and iridium--are preferentially retaine... | 07/21/1992 |
| 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 |
| 4900520 | Process for removal of soluble platinum group metal catalysts from liquid product mixtures A process for the neutralization, clarification and decolorization of organosilanes or organosilicones derived from the reaction of an organosilane or a hydropolysiloxane with an aliphatically unsaturated compound in the presence of an acidic platinum cat... | 02/13/1990 |
| 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 |
| 4806489 | Matrix modifier and method for modifying a matrix to improve analysis of metal constituents during graphite furnace atomic absorption spectroscopy A matrix modifier of finely-divided metallic palladium dispersed to contact a metal constituent to improve analysis of the constituent during graphite furnace atomic absorption spectroscopy. The palladium interacts with a variety of metals in a sample to ... | 02/21/1989 |
| 4585477 | Method for separating and recovering nickel and copper from complex materials A method of recovering copper and nickel from sulphidic minerals containing copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate... | 04/29/1986 |
| 4448886 | Biodispersions A process for producing high dispersion metal crystallites dispersed substantially homogeneously in a carbonaceous material matrix is disclosed. The novel metal crystallite dispersions disclosed herein have the added advantage of being locked into the mat... | 05/15/1984 |
| 4390366 | Process for the extraction of precious metals from solutions thereof A process for sequentially and selectively separating gold and platinum group metals from aqueous solutions containing them is disclosed. First, ruthenium and osmium are oxidized to their tetroxides and then removed from the solution. Then, gold is removed by ... | 06/28/1983 |
| 4360380 | Process for recovery of metal values from sludges A process for the recovery of selected metal values from silica containing sludges including incineration of the sludge to degrade organic components, followed by acid leaching of the ash, followed by hydrometallurgical recovery of metal values from the r... | 11/23/1982 |
| 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 |
| 4273578 | Method for recovering rhodium A method for recovering rhodium from a residue of the oxo synthesis or of a hydroformylation which comprises contracting said residue with sulfur and separating and converting the resultant rhodium-containing precipitate to rhodium or a rhodium compound i... | 06/16/1981 |
| 4272288 | Concentration, separation and recovery of precious metals A process is provided for the concentration, separation and/or recovery of precious metals such as platinum and palladium via their soluble amine complexes from solutions by sorbing said complexes in one or more members of a novel class of zeolites. Said ... | 06/09/1981 |
| 4164418 | Method of recovering valuable metals from zinc bearing materials and blast furnace relevant thereto The blast furnace in the present invention comprises a V-shaped or an inclined hearth, tuyeres disposed along said hearth, a tap hole for discharging matte and/or slag, said tap hole being disposed at the lowest part of the hearth, and dampers having V-sh... | 08/14/1979 |
| 4155750 | Recovery and purification of rhodium A process for the recovery or purification of rhodium wherein: (i) a solution of a soluble anionic rhodium complex is treated to precipitate insoluble pentammino-chloro rhodium dichloride; (ii) the rhodium is redissolved in the form of the equivalent hydroxo c... | 05/22/1979 |
| 4069040 | Method for recovery of platinum and iridium from catalysts The invention relates to the recovery of the constituent elements of catalysts containing precious metals, such as platinum and iridium deposited on aluminous supports. This recovery is accomplished by a substantially total solubilization of the catalysts... | 01/17/1978 |
| 4033763 | Process for recovery of selected metal values from waste waters A process for economically recovering metal values, especially precious metal values, from waste waters comprising a mixture of natural surface water, industrial waste water and organic waste, where the metal values appear in concentrations below levels p... | 07/05/1977 |
| 3985552 | Separation of platinum group metals and gold A method of separating gold from palladium or at least one of gold and palladium from solutions containing the chloride complexes of at least the relevant ones of these metals together with other platinum group metals and wherein base metals may be presen... | 10/12/1976 |
| 3979207 | Refining of noble group metals This invention relates to the separation and purification of platinum group metals and, in particular to the separation of mixtures of rhodium, platinum and irridium. According to one specific form of the invention, the platinum, rhodium and iridium are p... | 09/07/1976 |
| 3960549 | Process for the separation and purification of platinum, rhodium and iridium This invention relates to a process for the separation and purification of platinum group metals and particularly platinum, rhodium and iridium. Essentially the platinum group metals are present as salts dissolved in an aqueous solution and the process fo... | 06/01/1976 |
| 3958985 | Extraction method for non-ferrous metals Non-ferrous metals are recovered from metal bearing ores or other metal sources in substantially quantitative yields by treating a finely divided metal bearing material with an aqueous inorganic acid to form a slurry and baking the slurry at atmospheric p... | 05/25/1976 |
