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| Number | Title | Issue Date |
| 7531151 | Powdered metals extracted from acid mine drainage and their use in the manufacture of pressed metal articles Acid mine drainage is treated to form a wet meal-containing precipitate. Such wet metal containing precipitate is dried and processed to form a powder which contains one or more metals. The powder (alone or in combination with other metal powders or other additives)... | 05/12/2009 |
| 7404937 | Production of synthetic rutile by continuous leaching A reactor 20 has a plurality of tubular downcomers 32, 34, 36, 38, 40 and risers 42, 44, 46, 48, 50, joined by sections 86, 88 in a continuous serpentine path the tubes dimensioned to provide substantially plug flow conditions for solid a... | 07/29/2008 |
| 7399454 | Metallurgical dust reclamation process Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution. The reaction is performed at a pressure of at least about 220 psig and at a temperature of at least 100° C. The metallurgical... | 07/15/2008 |
| 7387767 | Recovery of nickel, cobalt, iron, silica, zinc and copper from laterite ore by sulfuric acid leaching A process for recovering nickel and cobalt values from nickel- and cobalt-containing laterite ores as an enriched mixed nickel and cobalt sulphide intermediate and for producing nickel and cobalt metal from the nickel and cobalt sulphide intermediate. The laterite o... | 06/17/2008 |
| 7347893 | Iron oxide pigments from mill scale The current invention relates to a method of manufacturing iron oxide pigments from mill scale. The mill scale is mixed with alien iron oxide and the resultant mixture is heated to a temperature of 200° C. to 900° C. in an oxidizing atmosphere to produce iron oxid... | 03/25/2008 |
| 7186395 | Iron oxides with a higher degree of refining Iron oxides are upgraded by calcining at from 700 to 1200° C. ... | 03/06/2007 |
| 7144561 | Method for the preparation of iron hydroxide, iron oxide hydrate or iron oxide from filter salts of dilute acid recovery Described is a method for the manufacture of iron hydroxide, iron oxide hydrate or iron oxide from filter salts from thin acid recovery, in which the filter salts are dissolved in water, the solution is adjusted to a pH of | 12/05/2006 |
| 7118719 | Method for the hydrolytic precipitation of iron The invention relates to a method for the hydrolytic precipitation of iron as jarosite from a sulphate-containing solution in connection with zinc recovery from zinc calcine. The recovey contains neutral leach, ferrite leach, zinc electrolysis and iron precipitation... | 10/10/2006 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impur... | 10/11/2005 |
| 6554915 | Dissolution of nickel in non-oxidizing aqueous acid solutions Fairly pure metallic nickel may be efficiently dissolved in non-oxidizing acid. If the nickel includes individual pieces longer than 0.5 mm in any linear dimension, oxidizing agent is preferably added from the beginning of dissolution, while if the nickel... | 04/29/2003 |
| 6440194 | Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag A method of recovering precious metals from metal alloys produced aluminothermically from base metal smelter slag, includes treating the metal alloy with aqueous sulphuric acid solution having a pH of not greater than about 2 to cause dissolution of nicke... | 08/27/2002 |
| 6391089 | Acid leaching of nickel laterite ores for the extraction of their nickel and cobalt values An improved process of hydrometallurgical treatment of laterite ores predominantly of the limonitic type for the recovery of nickel and cobalt using sulphuric acid. In order to obtain high extractions of these metals while treating these ores in their hum... | 05/21/2002 |
| 6365121 | Method for producing hyperazeotropic hydrochloric acid from metal chloride solutions The invention relates to a process for the preparation of superazeotropic hydrochloric acid from metal chloride solutions, e.g. spent pickling solutions. The process is characterized in that the metal chloride solutions are thermally decomposed with the f... | 04/02/2002 |
| 6248302 | Process for treating red mud to recover metal values therefrom A method for processing red mud to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the red mud to a digester containing an acid to provide a mixture of acid and red mud and heating the mixture ... | 06/19/2001 |
| 6139602 | Carbon catalyzed leaching of metal-containing ores Disclosed and claimed is an efficient process for extraction of metals from ores using carbon catalyzed leaching. Specifically exemplified is the extraction of cobalt and nickel from laterite ore.... | 10/31/2000 |
| 6039790 | Method for recovering nickel hydrometallurgically from two different nickel mattes The invention relates to a method for recovering nickel in one and the same process from two pyrometallurgically produced nickel mattes, one of which contains a remarkable percentage or iron. The leaching of iron-bearing nickel matte is carried out in one... | 03/21/2000 |
| 6022406 | Method for preparing inorganic pigments, resulting inorganic pigments, and apparatus therefor A method for preparing inorganic pigments from steel mill dust, particularly electric steel mill dust, wherein (a) the dust is separated into a magnetic fraction and a non-magnetic fraction; (b) the non-magnetic fraction is subjected to a basic leaching r... | 02/08/2000 |
| 5935545 | Process for producing an aqueous solution comprising ferric chloride The present invention provides a process for preparing an aqueous solution of FeCl3. The process involves the steps of: (a) reacting an ore material comprising titanium and iron with chlorine and coke to form a metal chloride vapor stream compr... | 08/10/1999 |
| 5888404 | Method for treating waste water sludge The invention relates to a method for treating waste water sludge comprising at least one metal originating from a waste water treatment coagulant, and phosphorus and heavy metals in order to recover said at least one metal and phosphorus and to discharge... | 03/30/1999 |
| 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 |
| 5833881 | Composition for inhibiting deposits in the calcination of fluxed iron ore pellets A stable aqueous solution comprising a water soluble salt of a magnesium compound, a surfactant and a calcium salt inhibitor is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during iron ore calcination.... | 11/10/1998 |
| 5800716 | Processes for the treatment of acidic liquors and for the production of commercial products thereby A process for the treatment of aqueous acidic liquors containing dissolved aluminum and/or iron compounds to produce an aluminum and/or iron sulfate water-treatment product is characterized by the combination of steps comprising contacting the liquor with... | 09/01/1998 |
| 5698759 | Treatment of polyvinylchloride A method is described which allows two hazardous waste products, namely PVC and electric arc furnace dust, both of which have negative commercial value, to be combined to produce an iron oxide suitable for steel making and making pure cadmium lead and zin... | 12/16/1997 |
| 5688378 | Photoassisted oxidation of species in solution The invention relates to methods and processes for the photoassisted oxidation of dissolved species such as arsenic, iron, phosphorous and sulphur. Each aspect of the invention involves supplying to a solution including the species to be oxidized, an oxid... | 11/18/1997 |
| 5599458 | Method to prevent the exhaustion of acid copper plating baths and to recover metallic copper from solutions and sludges containing copper in an ionic form Method to prevent the exhaustion of acid copper plating baths (12) and to treat sewage or sludges (20) containing copper in an ionic form so as to recover metallic copper (39), the method including the addition (11) of a compound which keeps the concentra... | 02/04/1997 |
| 5464596 | Method for treating waste streams containing zinc A method for the recovery of zinc products, including zinc oxide and elemental zinc, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc and iron, by treating the waste streams with carbon and an ammonium chloride solution... | 11/07/1995 |
| 5453111 | Method for separation of metals from waste stream A method for the recovery of metals including zinc, zinc oxide, iron-carbon feedstocks, lead and cadmium from industrial waste streams which entails treating the waste streams with carbon and an ammonium chloride solution, separating any undissolved compo... | 09/26/1995 |
| 5407463 | Recovery of Cd and Ni from batteries Method for recovering cadmium (Cd), nickel (Ni) and iron (Fe) from batteries containing the steps of: (a) reducing the size of the batteries to small pieces and separating the pieces into a coarse fraction and a fine fraction with the coarse fraction furt... | 04/18/1995 |
| 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 |
| 5324500 | Method for processing residues of barium sulfide or strontium sulfide leaching A method for treating residues of barium sulfide or strontium sulfide leaching with waste sulfuric acid and hydrochloric acid, which method significantly decreases the amount of residual material which must be disposed of.... | 06/28/1994 |
| 5312602 | Method for purifying iron oxide A method is described for purifying iron oxide, for example, in the form of magnetite or hematite slime, which preferably contains quartz as the impurity. The method comprises calcinating the iron oxide together with alkali carbonate and thereafter leachi... | 05/17/1994 |
| 5308501 | Treatment system for alkaline or acidic solution containing heavy metals There is disclosed a method of treating a solution, e.g., an alkaline or acidic solution, containing heavy metals ions therein. With respect to alkaline solutions, the method includes providing a body of the solution; contacting the body with a material s... | 05/03/1994 |
| 5250275 | Process for separating silicon compounds contained in a hydrochloric bath used for pickling This process in which the used bath is recycled after concentration at (1) by elimination of water at (2), followed by a treatment for recovering iron oxides at (10), is characterized in that it comprises carrying out a tangential microfiltration at (5) o... | 10/05/1993 |
| 5091161 | Production of pure magnesium chloride solution from siliceous magnesium minerals A process for the production of pure magnesium chloride liquor from siliceous magnesium minerals comprises the steps of continuously leaching the siliceous magnesium mineral with a hydrochloric acid solution at a temperature higher than 50° C. but below ... | 02/25/1992 |
| 5089242 | Method for selectively separating a non-ferrous metal A method for selectively separating Zn from an acidic aqueous solution containing ions of Zn and Fe obtained by leaching of blast furnace dust using hydrochloric acid comprises first precipitating Fe from the solution and then treating the resultent Zn-co... | 02/18/1992 |
| 5057469 | Preparation of iron nitrosyl carbonyl catalyst Iron nitrosyl carbonyl catalyst is prepared by dissolving impure iron nitrosyl carbonyl in a solvent solution, then adding sufficient miscible non-solvent to the solution to result in separation of the mixture into an upper layer and a lower layer contain... | 10/15/1991 |
| 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 |
| 4966760 | Method for recovering chromium from chromium-bearing material A method for recovering chromium from chromium-bearing material which comprises heating the material which can contain any one or combination of Co, Ni, Fe, Mo, and W with solid alkali metal hydroxide in an oxidizing atmosphere at 600° C.-1000° C. to fo... | 10/30/1990 |
| 4889694 | Recovery of zinc values from zinc and iron-bearing sulfide materials Iron-containing zinc sulfide concentrate is processed to recover zinc values therefrom. The concentrate is roasted to convert zinc sulfide and iron sulfide to their oxides while adequate sulfide-sulfur is retained to maintain the iron values in the ferrou... | 12/26/1989 |
| 4888053 | Chloride leaching of iron-based, heavy metal-containing sludges A method for removing and recovering toxic heavy metal contaminants from an iron-bearing sludge is provided. The method comprises one or more cycles of a two step, controlled chloride leach comprising a first non-acidic chloride leaching solution and a se... | 12/19/1989 |
