| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 11/26/1991 | US5068094 Process for the removal of cadmium ions from phosphoric acid resulting from a wet process |
| 11/26/1991 | CA2043245A1 Recovery of metals from insoluble metal oxides by microorganisms |
| 11/16/1991 | CA2042428A1 Use of thioether ligands for separating palladium from aqueous solutions and in particular nitric solutions for dissolving irradiated nuclear fuel elements |
| 11/14/1991 | WO1991017124A1 New formulations for iron oxides dissolution |
| 11/14/1991 | DE4114494A1 Auto catalytic conversion of liq. wastes contg. metals - useful for decontamination of wastes from electrolytic processes ion exchange regeneration etc. avoiding electrodeposition |
| 11/13/1991 | CN1014722B New technology of wet lead-smelting |
| 11/13/1991 | CN1014698B Method for producing ammonium molybdate and nickel-ammonium sulphate from molybdenucm-nickel ore |
| 11/12/1991 | US5064466 Non-toxic process for recovery of photographic silver |
| 11/10/1991 | CA2016492A1 Recovery of platinum group metals (pgm) from acidic solutions by reduction precipitation with sodium borohydride |
| 11/05/1991 | US5062956 Bioremediation of chromium (VI) contaminated aqueous systems by sulfate reducing bacteria |
| 10/31/1991 | WO1991016465A1 Method for stripping metals in solvent extraction |
| 10/30/1991 | CN1055767A Preparation of fluorescence grade eu2o3 by reduction--chro-matographic extraction method |
| 10/30/1991 | CN1055766A Process for making zine oxide from zinc bearing flue ash |
| 10/30/1991 | CN1014532B Combinative leaching and extracting method, leachex |
| 10/29/1991 | US5061460 Method for manufacturing titanium oxide |
| 10/28/1991 | WO1991017274A1 Metal extraction by ion exchange |
| 10/28/1991 | WO1991017113A1 Method for removing cadmium for phosphoric acid |
| 10/28/1991 | WO1991016972A1 Process for producing chelatising ion-exchange resins and their use in metal extraction |
| 10/28/1991 | CA2079596A1 Metal extraction by ion exchange |
| 10/28/1991 | CA2073061A1 Process for producing chelatising ion-exchange resins and their use in metal extraction |
| 10/28/1991 | CA2062942A1 Method for removing cadmium from phosphoric acid |
| 10/23/1991 | CN1055619A Method for separating by using crown compounds plutonium from uranium and from fission products in initial stages for reprocessing of irradiated nuclear fuels |
| 10/16/1991 | EP0451456A1 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 10/16/1991 | CN1055395A Precipitation of rare earth by replacing oxalic acid with carbonic acid |
| 10/16/1991 | CN1055394A Preparation of high-purity cerium compound by use of solvent extraction method |
| 10/16/1991 | CN1055393A Process for separation of yttrum |
| 10/15/1991 | US5057284 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 10/12/1991 | WO1991015591A1 DEGRADATION OF FERRIC CHELATES BY A PURE CULTURE OF $i(AGROBACTERIUM SP.) |
| 10/12/1991 | CA2079899A1 Degradation of ferric chelates by a pure culture of agrobacterium sp. |
| 10/09/1991 | EP0451003A1 Process for the separation of yttrium |
| 10/09/1991 | EP0450047A1 Polymer bead containing immobilized metal extractant |
| 10/09/1991 | EP0449942A1 Phosphonic acids and their uses in separation. |
| 10/09/1991 | CN1055203A Processing for extraction of rare-earth elements |
| 10/08/1991 | US5055402 Removal of metal ions with immobilized metal ion-binding microorganisms |
| 10/08/1991 | US5055130 Method for recovering silver from refractory manganese ores |
| 10/08/1991 | CA1290225C Process for metal recovery and compositions useful therein |
| 10/04/1991 | WO1991015606A1 A process for recovering a metal from an aqueous solution comprising a mixture of metal chloride |
| 10/04/1991 | CA2079797A1 Process for recovering a metal from an aqueous solution comprising a mixture of metal chloride |
| 10/03/1991 | WO1991014793A1 Process for removing inorganic gels and incompressible solids from acidic media |
| 09/30/1991 | CA2013537A1 Recovery of gold from solution by reduction-precipitation with stabilized alkali metal borohydride |
| 09/24/1991 | US5051128 Adsorption of a gold-iodine complex on an ion exchange resin, adding sulfuric acid and sodium nitrite and adding sodium sulf ite |
| 09/24/1991 | US5050997 Mixer-settler for liquid-liquid extraction |
| 09/24/1991 | CA2038580A1 Biological oxidation of sulfide ore |
| 09/19/1991 | WO1991014008A1 Microbiological oxidation process for recovering mineral values |
| 09/19/1991 | WO1991014007A1 Biological conversion apparatus and method |
| 09/17/1991 | US5049363 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 09/17/1991 | US5049280 2,3-dihydroxyterephthalamides as highly effective metal ion sequestering compounds |
| 09/11/1991 | EP0445347A2 Process of extracting anions with quaternary amines |
| 09/10/1991 | CA1288599C Process for the stripping of cesium ions from aqueous solutions |
| 09/06/1991 | WO1991014010A1 Method for cleaning and recovering metal mercury from roasting gases containing it |
| 09/06/1991 | CA2054744A1 Method for cleaning and recovering metal mercury from roasting gases containing it |
| 09/05/1991 | WO1991013180A1 Production of synthetic rutile |
| 09/05/1991 | DE4006336A1 Pressure leaching of metals - using high pressure water-solvent jet |
| 09/04/1991 | CN1054269A Chromium-carbonate process for separation of mixed rare-earth in groups |
| 09/04/1991 | CN1054268A Extraction and recovery of gold |
| 09/04/1991 | CN1013770B Wet smelting zinc |
| 09/03/1991 | US5045290 Recovery of pure platinum and palladium |
| 09/03/1991 | CA1288211C Process for recycling sulphuric acid containing metal sulphate |
| 08/24/1991 | WO1991013177A1 Extraction and recovery of gold |
| 08/23/1991 | WO1991013182A1 Deoxidation of a refractory metal |
| 08/23/1991 | CA2075922A1 Deoxidation of a refractory metal |
| 08/22/1991 | WO1991012347A1 Process for making finely divided particles of silver metal |
| 08/22/1991 | DE4005026A1 Removing gold and silver from antimony ores - by reacting with ammonia under oxygen pressure and high temp. to remove noble metals in soln. |
| 08/21/1991 | EP0232380B1 Process for purifying silver refinery slimes |
| 08/21/1991 | CN1053901A Process for making finely divided particles of silver |
| 08/14/1991 | EP0441210A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 08/13/1991 | US5039497 Process for separating copper from aqueous base solutions |
| 08/13/1991 | US5039496 Process for selective extraction of contaminant elements from mixtures of electrolytes in solution |
| 08/13/1991 | US5039336 Fluidized bed chlorination |
| 08/08/1991 | WO1991011539A1 Separation process |
| 08/08/1991 | WO1991009145A3 Method for recovering metals from waste liquors |
| 08/07/1991 | EP0439744A1 Method for separating copper impurities from molybdate solutions |
| 07/30/1991 | CA2034791A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 07/24/1991 | CN1053266A Silver recovering method and equipment from the waste water in film developing and printing factory |
| 07/23/1991 | US5034055 Process for the enhanced production of silver from gold and silver bearing ore |
| 07/17/1991 | CN1053092A Treatment and use of waste residue and waste liq. from cd-ni cell |
| 07/17/1991 | CN1013207B Technology for industrial extracting gold by thiocarbamide-iron leaching process |
| 07/16/1991 | US5032367 Method for producing powdered iron oxide |
| 07/10/1991 | CN1052903A Conversion treatment of lead-base gold or lead ores with soda |
| 07/09/1991 | US5030427 Washing solutions of n-organohydaoxamic acid complexes |
| 07/09/1991 | US5030426 Biomining of gallium and germanium containing ores |
| 07/09/1991 | US5030425 Biodegradation and recovery of gallium and other metals from integrated circuits |
| 07/09/1991 | US5030279 Controlled percolation method for heap leach mining |
| 07/09/1991 | CA1285792C Process for preparing finely divided metal powders |
| 07/03/1991 | EP0434831A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 07/03/1991 | CN1052699A Extracting and separating foreign matter in wolfram or sodium molybdate solution |
| 07/02/1991 | US5028403 Metal recovery with monothiophosphinic acids |
| 07/02/1991 | US5028398 Device for providing a continuous biological decomposition of minerals and concentrates thereof |
| 07/02/1991 | US5028334 Selective recovery of tin by solvent extraction using branched tertiary phosphine oxides |
| 07/02/1991 | US5028260 Recovery of gold from acidic solutions |
| 07/02/1991 | US5028259 Recovery of precious metal |
| 06/27/1991 | WO1991009145A2 Method for recovering metals from waste liquors |
| 06/26/1991 | EP0434513A1 Method for separating plutonium and uranium from fission products using crown ethers, in the first stages of treating irradiated nuclear fuel |
| 06/26/1991 | EP0434053A1 Process for treatment of nickel magnesium silicate ores |
| 06/26/1991 | CN1012942B Pipeline type diffuser |
| 06/25/1991 | US5026420 Ion exchanging to absorb heavy metals |
| 06/25/1991 | US5026029 Silver controller |
| 06/21/1991 | CA2032279A1 Process for treatment of nickel magnesium silicate ores |
| 06/19/1991 | EP0433107A1 Process for the recovery of gallium from basic solution |
| 06/19/1991 | EP0432935A1 Processes to recover and reconcentrate gold from its ores |