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| Number | Title | Issue Date |
| 7294168 | Method for purifying the solution in the hydrometallurgical processing of copper The invention relates to the removal of bivalent copper from copper chloride solution in connection with the hydrometallurgical production of copper. In the copper production process, a copper-bearing raw material is leached with a chloride-bearing solution. The cop... | 11/13/2007 |
| 6517789 | Method for reclaiming constituents from an industrial waste stream An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weigh... | 02/11/2003 |
| 6423281 | Method for reducing the formation of Zn(NH4)4Cl2 from ZnO/NH4Cl solutions A method for reducing the formation of Zn(NH4)4 Cl2 from ZnO/NH4 Cl solutions formed during an industrial waste stream recycling method useful for the recovery of high purity zinc oxide products and other chemic... | 07/23/2002 |
| 6395242 | Production of zinc oxide from complex sulfide concentrates using chloride processing The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxyge... | 05/28/2002 |
| 6264903 | Method for recycling industrial waste streams containing zinc compounds An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weigh... | 07/24/2001 |
| 6146909 | Detecting trace levels of copper The specification describes an analytical technique for determining trace levels of copper in a background matrix of titanium by dissolving the titanium and the copper impurity in HF, then selectively depositing the copper on a clean silicon surface. The ... | 11/14/2000 |
| 5954854 | Method for recovering etchant from etching waste liquid containing iron chloride Method for recovering etchant from etching waste liquid 11 containing iron chloride is disclosed, wherein iron powder is mixed with iron chloride waste solution containing metal ions having a lesser ionization tendency than iron ion in an mixing vessel so... | 09/21/1999 |
| 5906749 | Method for recovering metals from solutions A method for recovering metals from solutions is described. A particular embodiment of the method concerns recovering copper metal from aqueous solutions containing copper ions, such as ammoniacal circuit-board etching solutions. A working embodiment of t... | 05/25/1999 |
| 5788740 | Method for the hydrometallurgical separation and recovery of biological nutrients, lead, gypsum and cadmium from raw materials Methods and apparatus for the hydrometallurgical separation and recovery of biological nutrients, cadmium, lead, and gypsum from raw materials such as electric arc furnace flue dust. Biological nutrients, including zinc and iron, are selectively separated... | 08/04/1998 |
| 5709730 | Hydrometallurgical processing of flue dust Electric arc furnace production of recycled steel is plagued by the formation of an iron-depleted, metal-rich electric arc flue dust (EAFD). In the present invention, we recover at least about 85 wt. % of the base metals in the EAFD (i.e., lead, cadmium, ... | 01/20/1998 |
| 5679259 | Method for recovering metals from solutions A method for recovering metals from solutions is described. A particular embodiment of the method concerns recovering copper metal from aqueous solutions containing copper ions, such as ammoniacal circuit-board etching solutions. A working embodiment of t... | 10/21/1997 |
| 5662861 | Liquid extraction Apparatus for liquid extraction is described. The apparatus includes a mixer to which a solvent stream (15) and a feed stream (16) are fed and in which they are mixed to form a flow stream or dispersion. The flow stream is fed to a two-stage settler (17) ... | 09/02/1997 |
| 5616168 | Hydrometallurgical processing of impurity streams generated during the pyrometallurgy of copper Impurity streams generated during the metallurgy of copper are hydrometallurgically processed at ambient pressure for recovery of primary values in an energy-efficient manner and with the capture and conversion of metallic impurities to states that are ac... | 04/01/1997 |
| 5571306 | Method for producing an enriched iron feedstock from industrial furnace waste streams A method for the production of an enriched iron product, specifically direct reduced iron and iron oxide suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by combining an iron oxide rich material such as mil... | 11/05/1996 |
| 5472618 | Method for recovering metals from solutions A method for recovering metals from solutions is described. A particular embodiment of the method concerns recovering copper metal. The method comprises first treating a solution containing copper ions with a sufficient amount of an inorganic acid to obta... | 12/05/1995 |
| 5403382 | Method and apparatus for copper processing Copper is extracted from ore by crushing copper bearing ore followed by heap leaching with sulfuric acid and then moving the resulting solution to a tank containing scrap iron and agitating the solution to precipitate the copper. The tank possesses at lea... | 04/04/1995 |
| 5348722 | Removal of detrimental metal ions from hydrofluoric acid solution for cleaning silicon surfaces The invention relates to the removal of detrimental metal ions represented by Cu ion from a hydrofluoric acid solution for use in the manufacturing of semiconductor devices to clean silicon wafer surfaces. The acid solution is brought into contact with si... | 09/20/1994 |
| 5316567 | Hydrometallurgical copper extraction process A process for the extraction of copper from a sulphide copper ore or concentrate comprises the steps of subjecting the ore or concentrate to agitation leaching at an elevated temperature and pressure to obtain a resulting acidic leach liquor containing di... | 05/31/1994 |
| 5240687 | Brine treatment Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polishes the geothermal brine by c... | 08/31/1993 |
| 5223024 | Hydrometallurgical copper extraction process A process for the extraction of copper from a copper ore or concentrate comprises first subjecting the ore or concentrate to agitation leaching at an elevated temperature and pressure in the presence of oxygen and water to obtain a resulting acidic leach ... | 06/29/1993 |
| 5145656 | Brine treatment Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polished the geothermal brine by c... | 09/08/1992 |
| 5145515 | Treatment of brine A method is disclosed for polishing geothermal brines containing iron-rich silica scale and silica particles suspended therein while removing and recovering copper, silver and other precious metals dissolved therein. The method comprises passing brine hav... | 09/08/1992 |
| 5133873 | Process for removal of copper ions from aqueous effluent This invention relates to a process for removing copper ions from highly acidic waste water generated during the manufacture of dyes or pigments or intermediates thereof. The waste water is exposed at a pH less than about 1 to a bed of suspended iron part... | 07/28/1992 |
| 5122279 | Ferrous dithionite process and compositions for removing dissolved heavy metals from water Heavy metal ions react with ferrous dithionite in acidic aqueous solution. They are reduced to metallic particles that are suitable for recycling and reuse when recovered from the acidic water. When chelating agents are present, they are deactivated by bo... | 06/16/1992 |
| 5110354 | Closed loop copper cell extraction process A method for the extraction of metals such as copper from ore of the same which involves re-cycling of the barren solution back to the leach pad from the various steps in the process which results in an environmentally clean leach pad with usable gravel f... | 05/05/1992 |
| 5104445 | Process for recovering metals from refractory ores The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert ir... | 04/14/1992 |
| 5092563 | Apparatus for recovery of heavy metals from highly concentrated wastewater solutions A reactor for recovering metals such as copper, tin and lead from concentrated, acidic aqueous solutions includes a reaction vessel retaining a bed of scrap aluminum in a packed bed above the bottom of the vessel; a plenum below the packed bed of scrap al... | 03/03/1992 |
| 5082492 | Recovery of precious metals from aqueous media A method is disclosed for polishing geothermal brines containing iron-rich silica scale and silica particles suspended therein while removing and recovering copper, silver and other precious metals dissolved therein. The method comprises passing brine hav... | 01/21/1992 |
| 5078786 | Process for recovering metal values from jarosite solids This invention concerns a process for recovering metal values from jarosite-containing materials by leaching with a calcium chloride solution at a temperature above about the atmospheric boiling point of the solution and under at least the autogenous pres... | 01/07/1992 |
| 5032175 | Process for removing impurities from flue dusts The invention is a process for the removal of high concentrations of impurities including antimony (Sb), bismuth (Bi), arsenic (As), lead (Pb), zinc (Zn), cadmium (Cd), selenium (Se) and tellurium (Te) contained in flue dusts produced during the smelting ... | 07/16/1991 |
| 5019273 | Method for recovery of heavy metals from highly concentrated wastewater solutions Heavy metals are reclaimed from a concentrated wastewater solution containing heavy metal cations and an acid by adding to the wastewater a bed of scrap aluminum in a total amount between about 160% and about 180% of the stoichiometric requirement for com... | 05/28/1991 |
| 5017346 | Process for treating zinc oxide bearing materials A process of refining zinc oxide from roasted zinc sulphide bearing concentrates comprises leaching the concentrate in an aqueous sulphur dioxide solution under controlled conditions providing selective separation of zinc from other elements contained in ... | 05/21/1991 |
| 4956097 | Waste treatment of metal containing solutions A method for waste treating metal containing solutions comprising decomposing the metal from the solution in the substantial absence of air and separating the decomposed (precipitated) metal from the solution.... | 09/11/1990 |
| 4950326 | Process for removal of dissolved copper from solution Removal of dissolved copper from solution according to the present invention involves treatment of waste solutions such as electroless copper overflow solutions with aluminum particles under reaction conditions promoting precipitation of dissolved copper ... | 08/21/1990 |
| 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 |
| 4655829 | Metal recovery process Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is controlled with respect to the molar concentration of Cu, Pb, a... | 04/07/1987 |
| 4637832 | Process for purifying solutions of zinc sulphate A process for purifying aqueous solutions of zinc sulphate removed from leaching processes and containing metals such as Cu, Cd, Ti, Ni, Co, Ge, As, Sb which consists in cementing said metals with zinc dust and with a couple of activators chosen between C... | 01/20/1987 |
| 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 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc a... | 10/08/1985 |
| 4500496 | Process for purifying molybdenite concentrates An improved process is disclosed for the treatment of molybdenite concentrate to remove impurities, such as copper and lead therefrom. According to this process, ferrous chloride liquor is introduced into a reactor which is made of a material that can wit... | 02/19/1985 |
