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| Number | Title | Issue Date |
| 7282080 | Process for extracting platinum group metals PGMs can be extracted from a source material by heat-treating the source material to form a residue containing PGMs in a cyanide leachable condition and, thereafter, cyanide leaching the residue using a solution containing cyanide to form a pregnant cyanide leach li... | 10/16/2007 |
| 7022469 | Silver halide photographic light-sensitive material A silver halide emulsion is disclosed, comprising at least one monovalent Au(I) complex coordinated with a compound represented by the following formula (1): R1—Ch—R2 (1) wherein R1 and R2 each... | 04/04/2006 |
| 6911570 | Method for fixating sludges and soils contaminated with mercury and other heavy metals The invention relates to a method, composition and apparatus for stabilizing mercury and other heavy metals present in a particulate material such that the metals will not leach from the particulate material. The method generally involves the application of a metal ... | 06/28/2005 |
| 5672328 | Method and apparatus for removing silver in the form of silver salts from a liquid By using a method of removing silver in the form of sparingly soluble silver salt, especially silver sulfide, from a solution containing another silver compound, such as a silver thiosulfate complex in a photographic fix or rinsing fluid by precipitation,... | 09/30/1997 |
| 5498398 | Method of treating spent electrolytic solution from electrolytic copper production Disclosed herein is a method for treating a spent copper-refining electrolyte to remove impurities such as copper (Cu), arsenic (As), antimony (Sb), bismuth (Bi), nickel (Ni) and the like by using a hydrogen sulfide gas. The method comprises the steps of:... | 03/12/1996 |
| 5238662 | Processes for recovering precious metals Disclosed is a process for recovering precious metals using a combination of smelting and an effective utilization of molten salt chlorination. More specifically, disclosed is a process including the steps of (i) contacting, for example, a matte with a ch... | 08/24/1993 |
| 5178842 | Method for precipitating and separating metals According to the method of the invention, at least one or several of the metals nickel, cobalt and copper can be selectively precipitated as sulphide by aid of elemental sulphur from aqueous solutions containing other metals such as zinc. The temperature ... | 01/12/1993 |
| 5176802 | Treatment of copper sulfide concentrates A hydrometallurgical method is provided for recovering copper from particulate copper sulfide flotation concentrate containing at least about 20% copper by weight as cuprous and cupric sulfide, a significant portion of the copper in the copper sulfide con... | 01/05/1993 |
| 5074910 | Process for recovering precious metals from sulfide ores The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at ... | 12/24/1991 |
| 5013355 | Method and apparatus for producing matte and/or metal Method and apparatus for producing matte and/or metal from sulphidic fine-grained ore or ore concentrate. The ore or ore concentrate is smelted in a flame chamber in such a way that at least part of the solid material in the flame chamber melts and flows ... | 05/07/1991 |
| 4891061 | Process for treating speiss Arsenic and antimony are separated from speiss by a roasting operation employing pyrite and coke and the arsenic is separated from the resultant product by a water pressure leaching operation.... | 01/02/1990 |
| 4857104 | Process for reduction smelting of materials containing base metals A process for reduction smelting of copper-, nickel- or cobalt-containing materials in which such a material, at least partly in oxidic form is heated or combusted in finely divided form in a neutral or oxidizing flame to provide superheated particles. Th... | 08/15/1989 |
| 4665842 | Apparatus for producing ignitable solids-gas suspensions An apparatus for producing ignitable solids-gas suspensions has a feeder for vertically feeding the solids-primary gas suspension, a secondary gas passage concentrically surrounding said feeder, and a stage for mixing both streams. In order to improve the... | 05/19/1987 |
| 4561884 | Apparatus for removal of impurity components from sulphidic and metallized molten copper mattes A process for the removal of impurities from sulphidic and metallized molten copper mattes, in which in preliminary smelting of the crude metal molten sulphide and molten arsenide-antimonide phases are produced, whereby (a) the molten arsenide-antimonide ... | 12/31/1985 |
| 4511540 | Exploitation of copper, nickel and cobalt by treating manganiferous matrix oxidized ores Process for treating oxidized ores with a manganiferous matrix to recover the small quantities of copper, nickel and cobalt, which consists of attacking the aforementioned ore by means of an aqueous solution of H2 SO4 with the simult... | 04/16/1985 |
| 4504309 | Process and apparatus for continuous converting of copper and non-ferrous mattes A continuous process and apparatus for converting non-ferrous mattes is disclosed. The process comprises feeding continuously or intermittently a liquid matte into a furnace while continuously blowing air, oxygen or oxygen-enriched air into the melt conta... | 03/12/1985 |
| 4431614 | Process for the separation of gold and silver from complex sulfide ores and concentrates The present invention relates to a process for the separation of gold and silver from complex sulfide ores and concentrates which, in addition to the primary metals, contain constituents having an adverse effect on the separation of the noble metals, by h... | 02/14/1984 |
| 4423011 | Selective recovery of base metals and precious metals from ores Metal values are recovered from ore concentrates by forming a sulfide matte, grinding the matte, leaching with sulfuric acid at elevated temperature to selectively extract nickel and iron, and leaching the residue with an acidic aqueous ferric or cupric s... | 12/27/1983 |
| 4415356 | Process for autogenous oxygen smelting of sulfide materials containing base metals An autogeneous smelting process for suldie materials using a roasted portion blended with unroasted material in the presence of a flux.... | 11/15/1983 |
| 4394164 | Process for removal of harmful impurities from metallurgical sulphide melts A process for the removal of harmful impurities, particularly arsenic, antimony, bismuth and lead, from metallurgical sulphide melts, in which the sulphide melt is sulphurated before conversion, during the slag-blowing stage or after it before the blister... | 07/19/1983 |
| 4385038 | Flotation recovery of lead, silver and gold as sulfides from electrolytic zinc process residues A process is disclosed for the recovery of lead, silver and gold from the iron-bearing residue of an electrolytic zinc process by froth-flotating a slurry of the iron-bearing residue in the presence of a sulfidic collector agent in order to froth-flotate ... | 05/24/1983 |
| 4377410 | Chromium recovery from superalloy scrap by selective chlorine leaching To recover chromium and other metals from scrap such as superalloy scrap, the scrap is sulfided to provide a molten matte which is cooled and fragmented, the fragments are leached selectively in an aqueous solution with chlorine at a controlled temperatur... | 03/22/1983 |
| 4323541 | Selective two stage leaching of nickel from nickel-copper matte A finely-ground nickel-copper matte is leached using an acid at a minimum temperature of approx. 80° C. and under oxidizing conditions in order to produce a nickel sulfate solution and a nickel-cooper sulfide residue, which is separated from the solution... | 04/06/1982 |
| 4304596 | Process for a sulfidizing pretreatment of the slag of pyrometallurgical processes in order to facilitate its further treatment Sulfidizing pre-treatment of slag from pyrometallurgical processes in order to facilitate its further treatment, by stacking solid sulfur-bearing reductant and molten slag in alternate layers, the temperature of the molten slag being so low that crystals ... | 12/08/1981 |
| 4289530 | Symmetrical quaternary ammonium compounds and their use in heavy metals recovery Symmetrical quaternary ammonium compounds of the formula ##STR1## are disclosed, wherein each Ar is identical and is phenyl or a condensed polynuclear aryl group having 2 to 4 aryl nuclei, each R is identical and is alkyl of 1 to 4 carbon atoms, X | 09/15/1981 |
| 4278539 | Method for removing heavy metals from aqueous liquids Method and apparatus for removing heavy metals as sulfides from aqueous liquids. The aqueous liquid is introduced into a circulating liquid loop wherein there are established a mixing zone, a controlled precipitation initiating zone, a crystal growing zon... | 07/14/1981 |
| 4274870 | Smelting of copper concentrates by oxygen injection in conventional reverberatory furnaces A process for the modification to existing and conventional reverberatory furnaces for smelting copper concentrates in such furnaces, for improving the thermal efficiency of the furnace and for achieving an increased concentration of SO2 in the... | 06/23/1981 |
| 4260588 | Production of sulphidic copper concentrates A process for the production of a sulphidic copper concentrate from a complex sulphidic concentrate containing as its main constituents copper, iron and at least one non-ferrous metal selected from the group consisting of zinc, lead, nickel and cobalt, co... | 04/07/1981 |
| 4241031 | Dissolution of nickeliferous sulfide material in HCl A process is provided for leaching nickeliferous sulfide material, such as NiS precipitate and thermally activated nickel sulfide material, e.g., nickel matte, the process comprising subjecting nickeliferous sulfide material in the finely divided state to... | 12/23/1980 |
| 4236915 | Process for oxygen sprinkle smelting of sulfide concentrates Method for producing a metal matte from a nonferrous metal containing sulfide concentrate in a reverberatory type furnace by sprinkling a mixture of sulfide concentrates, flux and an oxygen-rich gas as a plurality of paraboloidal suspensions into a hot su... | 12/02/1980 |
| 4169725 | Process for the refining of sulfidic complex and mixed ores or concentrates A suspension of finely divided impure sulfidic complex or mixed ores or concentrates and air flowing downwards in a reaction zone at a high temperature is first oxidized to vaporize the impurities and then reduced or sulfidized to bring the unvaporized im... | 10/02/1979 |
| 4157912 | Process for recovery of copper and zinc from complex sulphides A process for treating thermally activated metal sulfides containing copper, iron and zinc for separate recovery of zinc as zinc sulfide in which the metal sulfides are subjected to a two-stage countercurrent acid leach for the formation of copper sulfide... | 06/12/1979 |
| 4127639 | Process for recovering silver from residues containing silver and lead Aqueous lead solutions obtained by hot chloride leaching of residues containing lead and silver ore are subjected to selective precipitation of the silver as silver sulphide, with e.g. hydrogen sulphide. The silver can then be recovered in a known manner.... | 11/28/1978 |
| 4049438 | Non-ferrous metal recovery from deep sea nodules Manganiferous deep sea nodules containing non-ferrous metal values are selectively reduced to reduce manganic oxides to manganous oxide (MnO) and the non-ferrous metal values to the metallic state, and the selectively reduced nodules are then smelted to p... | 09/20/1977 |
| 4045211 | Method for increasing radiant heat transfer from hot gases Radiant heat transfer is increased by introducing to hot gases, such as those normally present in furnaces, a material which provides finely sized particles therein of the type which increase the emissivity and luminosity of the gases. The material is int... | 08/30/1977 |
| 4004990 | Process for separating and recovering nickel and cobalt A process for separating and recovering nickel and cobalt is provided wherein a sulfide material containing cobalt and nickel is first oxidation-roasted to remove volatiles and to convert the metallic values into their oxides. These oxides are then dissol... | 01/25/1977 |
| 3988149 | Metallurgical process using oxygen A continuous autogenous multi-stage process for converting non-ferrous metal sulfides, in an oscillating, elongated, gently sloped, sealed, tiltable, rounded cross-section furnace, discharging crude metal or low-iron matte at one end, and silicate slag an... | 10/26/1976 |
| 3985555 | Decomposition of chalcopyrite Chalcopyrite is decomposed by treatment with aqueous acid solution and a metallic reductant to form either metallic copper or copper sulfide, ferrous iron and hydrogen sulfide.... | 10/12/1976 |
| 3962051 | Atmospheric leaching of matte containing iron A method is provided for leaching comminuted nickeliferous sulfide matte containing by weight about 20% to 75% nickel, about 5% to 50% copper, non-stoichiometric sulfur in the range of over 4% to about 20%, over 0.5% to about 15 or 20% iron, the sum of th... | 06/08/1976 |
