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| Number | Title | Issue Date |
| 7438874 | Pressure oxidation leaching in the presence of an acidic solution of halide and sulfate ions from copper and base metal containing ore/concentrate A process for the extraction of a base metal such as Ni, Co or Zn, from suiphide ore or concentrate containing copper and the base metal comprises the step of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution co... | 10/21/2008 |
| 7364717 | Process for converting nickel to nickel sulfate A preferred embodiment of the present invention provides a process for making nickel sulfate by converting nickel metal into nickel sulfate, which may be converted to nickel hydroxide. Nickel metal is dissolved in sulfuric acid and oxygen containing gas is introduce... | 04/29/2008 |
| 6267800 | Process for producing cobalt metal powder from nickel-cobalt sulphides A process for producing cobalt metal powder from nickel-cobalt sulphides wherein said nickel-cobalt sulphides are leached in an ammoniacal ammonium sulphate solution under an elevated pressure of an oxygen bearing gas, at a temperature of at least 80° C.... | 07/31/2001 |
| 6264904 | Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt There is provided a process for the recovery of cobalt as cobalt (III) hexammine sulphate, comprising adding an effective amount of a calcium sulphate slurry to an ammoniacal ammonium sulphate solution containing cobalt (III) hexammine sulphate to thereby... | 07/24/2001 |
| 5853692 | Process for manufacturing high purity nickel chloride by recycling waste nickel anode A process for manufacturing nickel chloride is disclosed which is used as the raw material for manufacturing Zn--Ni coated steel plates, for electroless Ni plating industries, for electronic components, and for a high purity chemical additive Ni powder. T... | 12/29/1998 |
| 5344479 | Upgrading copper sulphide residues containing nickel and arsenic A process is disclosed for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte is leached in aqueous sulphuric acid solution under oxidizing conditions at atm... | 09/06/1994 |
| 5271909 | Method of tellurium separation from copper electrorefining slime A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to 150 psi and at an elevated temperature between about 100° a... | 12/21/1993 |
| 5229088 | Process for recovery of nickel and magnesium from a naturally occurring material A process is disclosed for recovering nickel and magnesium from natural material by extracting them in the presence of a spent sulfur containing iron based hydroconversion catalyst, under oxidative conditions.... | 07/20/1993 |
| 5194240 | Manufacture of ferric sulphate A process for the manufacture of ferric sulphate from ferrous sulphate in a closed circuit or vessel comprising a liquid phase and a vapor phase, wherein the vapor phase is essentially a closed system, the process comprising the oxidation between about 70... | 03/16/1993 |
| 5006320 | Microbiological oxidation process for recovering mineral values A process for the biological oxidation of sulfide in sulfide-containing ore. Preferably, the ore is then subjected to cyanide leaching. The resulting leach tail solution can be subjected to cyanide precipitation, employing ferric sulfate which is generate... | 04/09/1991 |
| 4919906 | Processes and equipment for production of elemental phosphorus and thermal phosphoric acid New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting furnaces thus eliminating hazardous waste generation. 2. Phosphorus fu... | 04/24/1990 |
| 4834793 | Oxidation process for releasing metal values in which nitric acid is regenerated in situ An oxidation process for releasing a metal of interest in an ore is described. The process is especially useful for releasing a metal of interest entrapped in a refractory ore. The process comprises reacting the ore with nitric acid until sufficient oxida... | 05/30/1989 |
| 4828809 | Separation of nickel from copper in autoclave Nickel is separated from copper contained in predominantly nickel- and copper-bearing sulphidic matte and alloys by chlorine leaching in an autoclave at over-atmospheric pressure. The leaching is conducted in an acidic solution at a redox potential range ... | 05/09/1989 |
| 4816236 | Recovery of vanadium and nickel from petroleum residues A process is provided for the recovery of vanadium and nickel values from petroleum residues and, in particular, from Flexicoke. In the process, Flexicoke is blended with an alkali metal source, such as sodium sulfate or sodium carbonate, and then roasted... | 03/28/1989 |
| 4789529 | Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting A process is described for the controlled oxidation roasting of zinc bearing sulphidic ores and concentrates by adjusting the furnace temperature and residence time together with the oxygen availability to the sulphide retention requirements in the calcin... | 12/06/1988 |
| 4778520 | Process for leaching zinc from partially desulfurized zinc concentrates by sulfuric acid A process comprises leaching zinc oxide either separately or in conjunction with iron oxides from a partially desulfurized zinc bearing sulfide ore of concentrate. The ore is pretreated to eliminate in a controlled manner sulfur-sulfur-sulfide in the ore ... | 10/18/1988 |
| 4728082 | Apparatus for biological processing of metal containing ores A method and attendant apparatus for use in bioleach processing of metal-bearing solids is disclosed. The method includes the placement into a tank of metal-bearing solids, a predetermined quantity of water, oxygen, carbon dioxide, nutrients and a species... | 03/01/1988 |
| 4647307 | Process for recovering gold and silver from refractory ores A process for the hydrometallurgical recovery of precious metal from an ore or concentrate containing at least some arsenopyrite or pyrite. The process comprises forming in a common volume space a gas phase and a liquid slurry comprising the ore or concen... | 03/03/1987 |
| 4608235 | Recovery of cobalt A process is disclosed for recovering cobalt from an alloy containing other metals as chromium, tungsten, etc. The process involves first adding the alloy to fused sodium hydroxide at a temperature of from about 750° C. to about 1000° C. to form a react... | 08/26/1986 |
| 4606764 | Method of recovering metals from ores using a formate reducing agent The invention comprises the treatment of metal oxides and mixed metal oxides and metal sulfides in a vertical tube reactor system having a downcomer section and a riser section in order to oxidize and dissolve the metal values in aqueous slurry primarily ... | 08/19/1986 |
| 4571262 | Recovery of platinum group metals from nickel-copper-iron matte A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper-iron sulphidic matte containing platinum group metals includes leaching ground matte at atmospheric pressure in acidic nickel-copper sulphate solu... | 02/18/1986 |
| 4435368 | Hydrometallurgical process for selective dissolution of mixtures of oxy compounds The invention provides a process for the selective dissolution of oxygenated compounds containing at least one non-ferrous metal selected from the group consisting of nickel, zinc, and copper, present in a mixture of oxygenated compounds containing said a... | 03/06/1984 |
| 4416693 | Recovery of titanium metal values Titanium metal values may be recovered from a metal-bearing source containing titanium and iron by subjecting the source to an oxidation treatment and a reductive roast. After having crushed the source to a desired particle size, the reduced source is the... | 11/22/1983 |
| 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 |
| 4376653 | Process for the production of nickel, high-purity magnesium oxide and cement Sulphuric acid leaching is applied to recover nickel from a nickel-containing oxidic raw material which also contains magnesium and iron. High-purity magnesium oxide and cement are produced at the same time. The heavy metals are separated by an organic me... | 03/15/1983 |
| 4350668 | Recovery of cobalt component from 3-pentenoic ester synthesis In a process for producing a 3-pentenoic ester which comprises reacting butadiene, carbon monoxide and an alcohol in the presence of a solvent and a catalyst selected from cobalt carbonyl or cobalt carbonyl complex, the improvement which comprises distill... | 09/21/1982 |
| 4343774 | Method for recovering valuable metals from deactivated catalysts Cobalt is recovered in substantial amounts from spent catalyst particles comprising cobalt components supported on alumina or other aluminum-containing refractory oxides. The process comprises contacting the catalyst with sulfuric acid, then subjecting th... | 08/10/1982 |
| 4331469 | Process for the recovery of silver values from silver-containing material which also contains iron and arsenic A process for the recovery of silver values from silver-containing material which also contains iron and arsenic includes leaching the material under oxidizing conditions at elevated temperature and pressure in aqueous nitric acid solution to dissolve a s... | 05/25/1982 |
| 4331635 | Recovery of copper and/or nickel and/or zinc Copper, nickel and zinc are recovered from sulfide minerals or concentrates thereof by leaching with ammonia at or near atmospheric pressure. A slurry of such minerals or concentrates in an aqueous solution containing free ammonia is passed into a closed ... | 05/25/1982 |
| 4322390 | Hydrometallurgical recovery of copper, cobalt nickel with reductive and oxidative leaching Desired metal values are recovered from metal-bearing sources by subjecting said metal-bearing sources to a reduction step which is effected in an aqueous solution of an ammoniacal ammonium salt containing a reducing reagent such as hydrazine, hydroxylami... | 03/30/1982 |
| 4311520 | Process for the recovery of nickel, cobalt and manganese from their oxides and silicates A process for the recovery of nickel, cobalt or manganese from their oxides or silicates wherein such process, which requires the application of heat, is improved by utilizing microwave energy as the source of heat. The microwave energy may be utilized to... | 01/19/1982 |
| 4307066 | Extraction of metals from mixtures of oxides or silicates Metals are extracted from mixtures of oxides or silicates by reacting the mixture at elevated temperature with a gaseous chlorinating agent comprising a mixture of water vapor and hydrogen chloride to selectively chlorinate the desired metal or metals.... | 12/22/1981 |
| 4298582 | Vanadium recovery from scrap alloys Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt, nickel, iron, and copper. The scrap is calcined with sodium carbo... | 11/03/1981 |
| 4280986 | Method for separating metal values from sea nodules A process for separating metal values from sea nodules by sulfating the nodule ore under substantially dry conditions, followed by leaching of the sulfated ore; separation of the leaching solution from water-insoluble residue and recovery of the metal val... | 07/28/1981 |
| 4201748 | Process for thermal-activation of chalcopyrite-pyrite concentrates A process for thermal activation of chalcopyrite-pyrite ore concentrates for activation of iron values in both chalcopyrite and pyrite constituents whereby said iron values can be selectively removed in a subsequent acid leach. Controlled oxidizing condit... | 05/06/1980 |
| 4200455 | Hydrometallurgical recovery of metal values The present process involves an improvement in the hydrometallurgical recovery of metal values from metal bearing sources such as ores and the like. When subjecting a metal bearing source to a reductive roast in a reducing atmosphere followed by cooling t... | 04/29/1980 |
| 4189461 | Metal leaching from concentrates using nitrogen dioxide in acids Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are leached in two stages. In the second stage, preleached minerals are oxidized with nitrogen dioxide to enable the metal values... | 02/19/1980 |
| 4175952 | Recovery of iron and titanium metal values Iron metal values and titanium metal values may be recovered from iron and titanium bearing sources such as an ilmenite ore by subjecting the source to a reductive roast after crushing the source to a desired particle size. The reduced source is then leac... | 11/27/1979 |
| 4174963 | Recovery of titanium metal values Titanium metal values may be recovered from titanium and iron bearing sources such as an ilmenite ore by subjecting the source to an oxidation treatment and a reductive roast after having crushed the source to a desired particle size. The reduced source i... | 11/20/1979 |
| 4175110 | Recovery of titanium metal values Titanium metal values are recovered from a titanium bearing source such as an ilmenite ore by subjecting the source to a reductive roast and leaching the reduced source with a halogen-containing compound. Following this the soluble metal halides are separ... | 11/20/1979 |
