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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 |
| 7341700 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature pressure leaching. Processes embodying aspects of the present invention may... | 03/11/2008 |
| 7294319 | Method for precipitating iron from a zinc sulphate solution as hematite This invention relates to a method for the removal of iron as hematite from a zinc sulphate solution in atmospheric conditions during the electrolytic preparation of zinc. According to the method, the pH of the iron-containing solution is adjusted to a value of at l... | 11/13/2007 |
| 7217400 | Preparation of iron compounds by hydrothermal conversion An apparatus and continuous process for the conversion of one solid iron compound to another solid iron compound in a heterogeneous suspension wherein the suspension is formed by dispersing a solid starting iron compound in a liquid that is continuously fed through ... | 05/15/2007 |
| 7172074 | Concentration/calcination process of zinc silicated minerals and concentrate zinc silicate based product A concentration process of zinc silicated minerals, particularly willemite and calamine concentration, by single operations, or conventional steps of ore treatment, some of which include the following: Preparation of stockpiles of different mineralogical and content... | 02/06/2007 |
| 7157064 | Method for treatment of flue gas cleaning products The invention relates to a method of treating a halogen containing solid or semi solid waste material from a flue gas cleaning process, wherein the amount of alkaline compounds is sufficient to provide a suspension of the waste material in water with a pH value of a... | 01/02/2007 |
| 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 |
| 6869520 | Process for the continuous production of high purity electrolytic zinc or zinc compounds from zinc primary or secondary raw materials The invention relates to a process involving the following steps: a) performing leaching of the raw material with an acid aqueous solution to dissolve the zinc if said raw material is a solid; b) optionally performing solid-liquid separation; c) neutralizing the aqu... | 03/22/2005 |
| 6852237 | Method for improved recovery of metals Methodology for the extraction of metallic elements from solid and liquid metal-contaminated starting material such as mineral ores, recyclable wastes, contaminated soils, engraving solutions, metal finishing solutions, battery manufacturing solutions, toxic wastes ... | 02/08/2005 |
| 6783744 | Method for the purification of zinc oxide controlling particle size A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminary can be treated by adding carbon and an ammonium chloride solution, sep... | 08/31/2004 |
| 6726889 | Production of zinc oxide from acid soluble ore using precipitation method The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating... | 04/27/2004 |
| 6696037 | Method of recovering sulfur from minerals and other sulfur-containing compounds A sulfurous compound such as a sulfur-rich "float" (concentrate) obtained by flotation of the residue from the leaching of a zinc concentrate is heated at a temperature not lower than the melting point of sulfur but below its boiling point, preferably not... | 02/24/2004 |
| 6696029 | Method for the purification of zinc oxide controlling particle size A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminary can be treated by adding carbon and an ammonium chloride so... | 02/24/2004 |
| 6666903 | Method for improved recovery of metals Liquor compositions for the extraction of metallic elements from a metal-contaminated starting material such as mineral ores, recyclable wastes, contaminated soils, toxic wastes such as dusts producing through steelmaking processes by effectuating prefera... | 12/23/2003 |
| 6608001 | Catalyst and method of making micrometer sized spherical particles A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or me... | 08/19/2003 |
| 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 |
| 6500395 | Method for removing metals from air pollution control residues A method for the treatment of air pollution control (APC) residues comprising the steps of washing the residues at least one time in an alkaline solution maintained at a pH not lower than about 11.5, separating the alkaline washed residues from the alkali... | 12/31/2002 |
| 6475450 | Method of leaching zinc concentrate A method for directly leaching a zinc concentrate in one of the stages contained in the hydrometallurgical process for the production of electrolytic zinc. The method comprises: a neutral leach step, a zinc concentrate leach step, and an iron oxidation st... | 11/05/2002 |
| 6471849 | Process for the recovery of zinc from a zinc sulphide ore or concentrate A processs for the recovery of zinc from a zinc sulphide ore or concentrate comprises the steps of subjecting the concentrate to pressure leaching with an acidic solution containing at least about 15 g/L iron in solution to produce a zinc solution and a s... | 10/29/2002 |
| 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 |
| 6340450 | Method for leaching zinc concentrate in atmospheric conditions The invention relates to a method for leaching zinc concentrate in atmospheric conditions in the presence of trivalent iron. It is essential that the zinc concentrate is fed into conditions where in addition to trivalent iron, there are also jarosite nucl... | 01/22/2002 |
| 6338748 | Hydrometallurgical method for recovery of zinc from electric arc furnace dust The process uses hydrochloric acid solutions to extract zinc from electric arc furnace dusts containing zinc oxide and zinc ferrite. To selectively leach zinc and minimize iron dissolution by precipitating as FeO.OH and Fe2 O3, hot a... | 01/15/2002 |
| 6280501 | Base metal recovery A process for recovering a base metal from a material, the base metal being selected from cobalt, copper, nickel and zinc, the process comprising the steps of reacting the host material with a ferric ion species in a leach solution, at conditions sufficie... | 08/28/2001 |
| 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 |
| 6183706 | Autoclave having an agitator with an aerating impeller for high oxygen transfer rate to metal-containing slurries and method of use A method is disclosed for recovering a metal from a metal containing material by autoclaving with an autoclave which includes an agitator that includes a first inlet for a recycled oxygen-containing gas, a second inlet for a fresh oxygen-containing gas, a... | 02/06/2001 |
| 6171564 | Process for extraction of metal from an ore or concentrate containing nickel and/or cobalt A process for the extraction of metal from an ore or concentrate which contains nickel and/or cobalt values and other metals, comprises subjecting the ore or concentrate to acid leaching under pressure at pHࣘ2 to obtain a liquor containing nickel and/or... | 01/09/2001 |
| 6162346 | Process for recovery of zinc from sphalerite containing ores or concentrates A process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment consisting essentially of a heating cycle performed under non-oxidizing conditions ab... | 12/19/2000 |
| 6153155 | Recovery of the transition metal component of catalyst used in heavy feed hydroconversion The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is ca... | 11/28/2000 |
| 6129843 | Device for the removal and concentration of neutral mercury species from and water A device is provided for removing and concentrating neutral mercury species from air and water. The device includes a nonporous polymeric membrane, preferably in the form of a flattened tube, for capturing and removing the neutral mercury species from the... | 10/10/2000 |
| 6129779 | Reclaiming metallic material from an article comprising a non-metallic friable substrate A method for reclaiming a metallic material from a article including a non-metallic friable substrate. The method comprising crushing the article into a plurality of pieces. An acidic solution capable of dissolving the metallic material is provided dissol... | 10/10/2000 |
| 6120579 | Process for cleaning mercury-contaminated soils The present invention relates to a process for cleaning mercury-contaminated soils that is simple, efficient and safe to use. This process can also be used to clean soils contaminated with additional metals, such as zinc, copper and lead, at a lower pH. T... | 09/19/2000 |
| 6120744 | Addition reaction of hydroxy1-containing compounds with alkynes or allenes A process for preparing compounds of the formulae I and II ##STR1## where R1 and R have the meanings indicated in the specification by an addition reaction of a compound of the formula III R1 OH ... | 09/19/2000 |
| 6117408 | Method of producing zinc bromide A method for producing zinc bromide from zinc hydroxide contaminated with iron and manganese compounds. The method comprises the step of mixing zinc hydroxide feedstock containing metal impurities with a hydrobromic acid comprising elemental bromine in th... | 09/12/2000 |
| 6110433 | Process for the recovery of metals from used nickel/metal/rare earth hydride storage batteries The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a coarse fraction and a fine fraction capable of being treated s... | 08/29/2000 |
| 6103204 | Selective bioleaching of zinc A method of selectively leaching zinc from a source material containing zinc in sulphide form and iron, comprises the steps of subjecting the source material to bioleaching with a strict sulphur oxidizing micro organism or a mixed culture of sulphur oxidi... | 08/15/2000 |
| 6027543 | Method for removing a heavy metal from sludge A method for removing a heavy metal from sludge, including the step of putting the sludge into contact with a treating liquid to dissolve the heavy metal contained in the sludge into the treating liquid. The treating liquid is formed of either A or B, whe... | 02/22/2000 |
| 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 |
| 5993635 | Atmospheric mineral leaching process A method is provided for processing a sulphide mineral composition which at least partly comprises an iron-containing mineral. The method includes the steps of: (a) milling said composition to a particle size P80 of 20 microns or less; (b) leaching said c... | 11/30/1999 |
| 5968461 | Process for cleaning mercury-contaminated soils The present invention relates to a process for cleaning mercury-contaminated soils that is simple, efficient and safe to use. This process can also be used to clean soils contaminated with additional metals, such as zinc, copper and lead, at a lower pH. T... | 10/19/1999 |
