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4572823 Process for rhenium recovery
367
New Patents
forming soluble materials from precipitateforming cations is selected from the group consisting of solutions of acetic acid, hydrochloric acid, citric acid, mixtures thereof, one or more of the same in sequence and one or more of the same and mixtures thereof in combination with sulfuric acid.
4572771 ZINC RECOVERY FROM STEEL PLANT DUSTS AND OTHER ZINCIFEROUS MATERIALS Willem P Duyvesteyn, Mahesh C Jha, Benthuisen. CO, Netherlands assigned to Amax Inc A process is provided for recovering zinc from zinc residues containing iron, and lead. The residue is leached with hydrochloric acid to provide a pregnant liquor containing zinc, iron, and lead. The iron is selectively removed from the pregnant liquor and the zinc extracted from the liquor by an organic solvent extraction system. The zinc is subsequently stripped from the organic solvent using water or hydrochloric acid to provide a zinc chloride solution which is then fed to an electrowinning cell for the production of marketable electrolytic zinc.
4572802 PROCESS FOR RECOVERING ACTINIDES AND/OR LANTHANIDES Herve Musikas Claude Hubert, Rennes, France assigned to Commissariat a 1’Energie Atomique This invention relates to a process of recovering trivalent actinides, trivalent lanthanides or mixtures thereof from an aqueous acid solution by contacting the aqueous solution with an organic solution containing the diamides of the formula: See Patent for Chemical Structure (I) where R is C2-Cl0 alkyl. This process affords a good extraction efficiency level for the recovery of lanthanides and actinides, both of which are present in the trivalent state, or mixtures thereof, from installations for the reprocessing of irradiated nuclear fuels.
4572822 METHOD OF RECOVERING METALS FROM INDUSTRIAL BY-PRODUCTS Hideki Abe, Hiroshi Tanaka, Yachiyo, assigned to Dowa Mining Co Ltd
Japan
There is disclosed a novel method of recovering valuable metals from an industrial by-product containing copper and arsenic and at least one metal selected from among lead, zinc, iron, silver and cadmium, said method comprising leaching the by-product with sulfuric acid in an SO2 gas atmosphere at a temperature of 70 degrees C. or higher in the presence of a solid sulfide to thereby precipitate copper selectively as copper sulfide while dissolving other metal or metals in the leach solution and then separating the copper containing precipitate from the leach solution, said leach solution containing substantially no copper.
4572823 PROCESS FOR RHENIUM RECOVERY Takashi Ogata, Hiroshi Tasaki, Shunichi Kasai. Toda, Japan assigned to Nihon Kogyo Kabushiki Kaisha A process for rhenium recovery by the use of an anion exchange resin comprises eluting rhenium from the rhenium-adsorbed anion exchange resin with a hydrochloric acid solution containing a metal chloride. Preferred metal chloride is that of copper, cadmium, or zinc.
4572824 PROCESS FOR RECOVERY OF ZIRCONIUM AND ACID FROM SPENT ETCHING SOLUTIONS Bang M Kim assigned to General Electric Company In the manufacture of nuclear fuel tubes spent etching solutions containing nitric acid, zirconium, and hydrofluoric acid are produced as waste. A serial treatment process is employed to recover the zirconium and to restore the solution to the desired acid concentration. These processes include solvent extraction for zirconium removal and aqueous removal using evaporation or distillation.
New Patents
forming soluble materials from precipitateforming cations is selected from the group consisting of solutions of acetic acid, hydrochloric acid, citric acid, mixtures thereof, one or more of the same in sequence and one or more of the same and mixtures thereof in combination with sulfuric acid.
4572771 ZINC RECOVERY FROM STEEL PLANT DUSTS AND OTHER ZINCIFEROUS MATERIALS Willem P Duyvesteyn, Mahesh C Jha, Benthuisen. CO, Netherlands assigned to Amax Inc A process is provided for recovering zinc from zinc residues containing iron, and lead. The residue is leached with hydrochloric acid to provide a pregnant liquor containing zinc, iron, and lead. The iron is selectively removed from the pregnant liquor and the zinc extracted from the liquor by an organic solvent extraction system. The zinc is subsequently stripped from the organic solvent using water or hydrochloric acid to provide a zinc chloride solution which is then fed to an electrowinning cell for the production of marketable electrolytic zinc.
4572802 PROCESS FOR RECOVERING ACTINIDES AND/OR LANTHANIDES Herve Musikas Claude Hubert, Rennes, France assigned to Commissariat a 1’Energie Atomique This invention relates to a process of recovering trivalent actinides, trivalent lanthanides or mixtures thereof from an aqueous acid solution by contacting the aqueous solution with an organic solution containing the diamides of the formula: See Patent for Chemical Structure (I) where R is C2-Cl0 alkyl. This process affords a good extraction efficiency level for the recovery of lanthanides and actinides, both of which are present in the trivalent state, or mixtures thereof, from installations for the reprocessing of irradiated nuclear fuels.
4572822 METHOD OF RECOVERING METALS FROM INDUSTRIAL BY-PRODUCTS Hideki Abe, Hiroshi Tanaka, Yachiyo, assigned to Dowa Mining Co Ltd
Japan
There is disclosed a novel method of recovering valuable metals from an industrial by-product containing copper and arsenic and at least one metal selected from among lead, zinc, iron, silver and cadmium, said method comprising leaching the by-product with sulfuric acid in an SO2 gas atmosphere at a temperature of 70 degrees C. or higher in the presence of a solid sulfide to thereby precipitate copper selectively as copper sulfide while dissolving other metal or metals in the leach solution and then separating the copper containing precipitate from the leach solution, said leach solution containing substantially no copper.
4572823 PROCESS FOR RHENIUM RECOVERY Takashi Ogata, Hiroshi Tasaki, Shunichi Kasai. Toda, Japan assigned to Nihon Kogyo Kabushiki Kaisha A process for rhenium recovery by the use of an anion exchange resin comprises eluting rhenium from the rhenium-adsorbed anion exchange resin with a hydrochloric acid solution containing a metal chloride. Preferred metal chloride is that of copper, cadmium, or zinc.
4572824 PROCESS FOR RECOVERY OF ZIRCONIUM AND ACID FROM SPENT ETCHING SOLUTIONS Bang M Kim assigned to General Electric Company In the manufacture of nuclear fuel tubes spent etching solutions containing nitric acid, zirconium, and hydrofluoric acid are produced as waste. A serial treatment process is employed to recover the zirconium and to restore the solution to the desired acid concentration. These processes include solvent extraction for zirconium removal and aqueous removal using evaporation or distillation.