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| Number | Title | Issue Date |
| 8043585 | Liquid and solid effluent treatment process A process for recovering metals such as Ni, Co, Mn, Cu, Zn, among others, through precipitation as sulphides, enabling recovery of magnesium in the form of hydroxide, carbonate and oxide and providing recovery of sulphate as gypsum and ammonium sulphate. Liquid phas... | 10/25/2011 |
| 7416711 | Atmospheric pressure leach process for lateritic nickel ore An atmospheric leach process in the recovery of nickel and cobalt from lateritic ores, said processing including the steps of: a) separating the lateritic ore into a low magnesium containing ore fraction, and a high magnesium containing ore fraction by selective min... | 08/26/2008 |
| 7160471 | In-situ generation of oxygen-releasing metal peroxides A method for remediation of contaminants in soil and groundwater is disclosed. The method generates oxygen releasing solids in groundwater or soil by injecting an aqueous energetic oxidant solution containing free radicals, oxidative conditions can be created within... | 01/09/2007 |
| 6949232 | Producing cobalt (III) hexammine sulfate from nickel cobalt sulfides There is provided an improvement in a process for producing cobalt (III) hexammine sulphate which process comprises oxidatively pressure leaching nickel cobalt sulphides in an ammoniacal ammonium sulphate solution. The nickel and cobalt sulphides are oxidized to sul... | 09/27/2005 |
| 6872375 | Synthesis of hexammine cobaltic salts The invention provides an effective and efficient method of making a hexammine cobaltic salt, such as hexammine cobaltic nitrate, in a consistent fashion through the control of one or more selected parameters of manufacture. Specific parameters considered and evalua... | 03/29/2005 |
| 6680035 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores A hydrometallurgical process is provided for leaching nickeliferous laterite ores at temperatures below the boiling point of the pulp and at atmospheric pressure. The high iron fraction of the laterite, referred to as limonite, is first contacted with con... | 01/20/2004 |
| 6475457 | Process for manufacturing potassium nitrate fertilizer and other metal nitrates A process for producing potassium nitrate and other metal nitrates from the chlorides, sulfates, oxides of these metals. The process uses nitrogen dioxide as a true fluidizing medium in shallow beds of the aforementioned solids at moderately elevated temp... | 11/05/2002 |
| 6379636 | Method for leaching nickeliferous laterite ores A process is provided for the leaching of both the "limonite" (Fe approx. ࣙ25% and Mg approx. ࣙ6%) and "saprolite" (Fe approx. ࣘ20% and Mg approx. ࣙ10%) fractions of typical nickel and cobalt bearing laterite ore. The low magnesium fraction of the... | 04/30/2002 |
| 6352675 | Process for removing heavy metals from a caustic fluid stream The present invention provides both reagents and a process for removing heavy metals from a caustic fluid stream by the addition of reagents which are not corrosive or deleterious. Specifically, the present invention is directed to removing heavy metals f... | 03/05/2002 |
| 6319485 | Magnetic material and production method thereof A magnetic material made up of an assembly of particles substantially consisting of an "-Fe16 N2 crystal having a body-centered tetragonal system (bct). The magnetic material has a high saturated magnetic flux density and is d... | 11/20/2001 |
| 6261527 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores A process is provided for leaching nickeliferous laterite ores by hydrometallurgical methods at temperatures below the boiling point of the pulp and at atmospheric pressure from which high overall nickel and cobalt extractions are obtained. The high iron ... | 07/17/2001 |
| 5912402 | Metallurgical dust recycle process A treatment of metallurgical dust and recovery of valuable chemical commodities, comprising the steps of: leaching salts from the dust with water to create a washed EAF dust; reacting the washed EAF dust in a nitric acid solution resulting in a nearly com... | 06/15/1999 |
| 5558706 | Corrosion inhibiting pigment composition A corrosion inhibitor pigment composition is based a solid solution of (Ni2+ +Co2+)-bis-hydrogen cyanamide.... | 09/24/1996 |
| 5487779 | Corrosion inhibiting pigment composition and method A method of preparing a (Me)bis-hydrogen cyanamide composition with enhanced corrosion preventive activity, wherein Me is a divalent metal selected from the group consisting of nickel and cobalt or mixtures thereof. The method includes precipitating Ni(OH... | 01/30/1996 |
| 5446179 | Process for the preparation of micronutrient blends Metal complexes having high bulk density and a process for the production of the same without the generation of heavy metal-contaminated effluents are disclosed. Solid complexes of EDTANaFe and EDTAKFe having high bulk densities are formed by reaction wit... | 08/29/1995 |
| 5332565 | Manufacture of ferric sulphate compounds A process is provided for the manufacture of ferric sulphate compounds from ferrous sulphate in a closed vessel containing a liquid phase and a vapor phase, the process comprising the oxidation of Fe++ to Fe+++ under pressure utilizi... | 07/26/1994 |
| 5332560 | Process for the removal of zinc and nickel from copper ammine sulfate solutions A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and z... | 07/26/1994 |
| 5274151 | Process for the preparation of solid iron (III) complexes Fe(III) complexes having high bulk density and a process for the production of the same without the generation of heavy metal-contaminated effluents are disclosed. Solid complexes of EDTANaFe and EDTAKFe having high bulk densities are formed by reaction w... | 12/28/1993 |
| 5266297 | Liquid oxidizing method and apparatus A liquid oxidizing system has a closed circuit in which a liquid containing matter to be oxidized is circulated. The circuit is provided with an ejector for forming a jet stream of the liquid into which oxygen, or both oxygen and an oxidizing catalyst are... | 11/30/1993 |
| 5264192 | Method for detoxifying cyanide-containing water A method for treating cyanide-contaminated water in order to remove dissolved (e.g. free) cyanide (HCN and/or CN-) therefrom. Cyanide-contaminated water is a significant problem in the gold processing industry wherein cyanide compounds are used... | 11/23/1993 |
| 5194241 | Manufacture of hydroxylated ferric sulphate compound 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, the process comprising the oxidation between about 70° C. to about 150° C. of Fe++ .fwdarw.Fe | 03/16/1993 |
| 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 |
| 5188713 | Process for recovery of metal A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate having a concentration greater than about 1.5M and sulphuric ac... | 02/23/1993 |
| 5174812 | Separation and recovery of nickel and cobalt in ammoniacal systems A process for the separation and recovery of nickel from an ammoniacal ammonium carbonate liquor containing nickel II ions and cobalt III ions by liquid-liquid extraction where ammoniacal ammonium carbonate solutions are the only aqueous phases involved i... | 12/29/1992 |
| 5159094 | Process for the preparation of solid iron (III) complexes Fe(III) complexes having high bulk density and a process for the production of the same without the generation of heavy metal-contaminated effluents are disclosed. Solid complexes of EDTANaFe and EDTAKFe having high bulk densities are formed by reaction w... | 10/27/1992 |
| 5141725 | Process using cyanocobaltate complexes for removing oxygen from a stream A process is provided for selectively separating oxygen from an oxygen-containing fluid stream by bringing said fluid stream into contact with a high capacity solid state cyanocobaltate complex in a non-aluminosilicate environment represented by the chemi... | 08/25/1992 |
| 5102633 | Method for reducing impurities in hexammine cobalt halide compounds A method for reducing impurity levels of calcium, magnesium and/or silicon in hexammine cobalt halide compounds involves the addition of ferric ions and, optionally, soluble fluorides to an aqueous hexammine cobalt (III) chloride solution having a pH of a... | 04/07/1992 |
| 4954466 | Recovery of cobalt catalyst values A process is provided for recovering cobalt values from a cobalt-N-acetyliminodiacetic acid complex by dissolving the complex in an aqueous solution of a strong acidic solution, extracting the acid solution with a hydrocarbon solvent containing a trialkyl... | 09/04/1990 |
| 4943418 | Method of preparing high-purity manganese compounds In a method of preparing high-purity manganese compounds, wherein the method comprises adding a member selected from ferromanganese and metallic manganeses to an aqueous electrolyte-containing solution, dissolving said member while stirring and maintainin... | 07/24/1990 |
| 4942024 | Method for refining hydroxides of niobium and tantalum containing transition metals Refining of either niobium hydroxide or tantalum hydroxide containing transition metals as impurities is accomplished easily and economically by dissolving the metal hydroxide in an aqueous solution of either hydrofluoric acid or oxalic acid, adjusting th... | 07/17/1990 |
| 4917872 | Method for producing titanium fluoride A method for producing titanium fluoride comprises: a dissolution process, wherein iron-containing titanium material is dissolved in solutions containing hydrofluoric acid, fluoride solutions being produced; a first crystallization and separation process,... | 04/17/1990 |
| 4878945 | Hydrometallurgical process for treating refractory ores containing precious metals This invention is directed to an improved process for leach treating gold and silver bearing pyritic and arsenopyritic concentrates and ores. More particularly, the improved process avoids the necessity of adding recycled neutralized solution to the leach... | 11/07/1989 |
| 4830836 | Metal stripping system and an operation process therefor A metal stripping system and an operation process therefor which includes the following elements and steps. A main part of this system is a crystallization apparatus for metal stripping comprising a mixing zone of organic solvent and fluoride series strip... | 05/16/1989 |
| 4808406 | Preparation of cupric hydroxide compositions A method for producing finely divided stable cupric hydroxide composition of low bulk density comprising contacting solutions of an alkali metal carbonate or bicarbonate and a copper salt, precipitating a basic copper carbonate--basic copper sulfate to a ... | 02/28/1989 |
| 4690710 | Process for producing cobalt metal powder A process is disclosed for producing pure cobalt metal powder. The process involves contacting a cobaltous salt with a sufficient amount of an alkaline earth halide in an aqueous solution at a sufficient temperature for a sufficient time to form a solutio... | 09/01/1987 |
| 4681638 | Iron blue pigments and process for preparation Improved iron blue pigments and a process for the production thereof whereby the basic ferrous sulfate-ammonium or potassium sulfate-alkali metal ferrocyanide reaction is modified by the addition of zinc ions so as to alter the chemical composition and im... | 07/21/1987 |
| 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 |
| 4619816 | Recovery of cobalt from ammoniacal solutions containing cobalt and nickel A process for the extraction of Co (III) from ammoniacal solutions comprising Co (III) and Ni (II). The process comprises: (a) contacting said ammoniacal solution with (b) bis (2,4,4-trimethylpentyl)phosphinic acid or an ammonium or alkali metal salt thereof, ... | 10/28/1986 |
| 4612039 | Production of pure cobalt metal powder A method is disclosed for producing pure cobalt metal powder. The method involves reducing a cobalt containing source material to produce an intermediate cobalt metal, contacting this intermediate with an ammoniacal ammonium halide solution and a catalyst... | 09/16/1986 |
| 4578251 | Removal of chromium from cobalt A process is disclosed for removing chromium from cobalt. The process involves first contacting an acidic cobalt chloride solution with an oxidizing agent, followed by adjusting the pH to from about 3.2 to about 5.5 with a base at a sufficient temperature... | 03/25/1986 |
