| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 06/19/1991 | CN1052259A Convection elution |
| 06/18/1991 | US5024821 Solvent extraction process |
| 06/16/1991 | CA2031750A1 Method for separating by using crown compounds plutonium from uranium and from fission products in the initial stages for the reprocessing of irradiated nuclear fuels |
| 06/13/1991 | WO1991008318A1 Metal oxide production by leaching and hydrolysis |
| 06/13/1991 | WO1991008316A1 Processes to recover and reconcentrate gold from its ores |
| 06/12/1991 | EP0432125A1 Recovery of cobalt catalyst values |
| 06/12/1991 | CN1052147A Oxide production |
| 06/12/1991 | CN1052071A Process for preparing fine and extra-fine w powder from solution of ammonium tungstate |
| 06/11/1991 | US5023060 Recovery of gold by a carbon-in-pulp process |
| 06/11/1991 | US5023059 Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge |
| 06/11/1991 | US5022935 With a metal, heating to liquify deoxidant, cooling, purification of surface |
| 06/05/1991 | EP0430323A1 Silver recovery device |
| 06/05/1991 | CN2078324U Fixed bed for iron powder of loose medium |
| 06/05/1991 | CN1051941A Process for making cupric sulphate directly from copper-oxide ore |
| 06/04/1991 | US5021088 Biohydrometallurgical processing of ores, and microorganisms therefor |
| 06/04/1991 | US5021069 Metal extraction using microorganisms, oxygenation |
| 05/30/1991 | WO1991007512A1 Acid digestion of caustic calcined magnesite |
| 05/29/1991 | EP0429044A1 Process for recovering metals from aqueous solutions |
| 05/29/1991 | EP0428918A1 Process and device for elimination and recovery of valuable metals, in particular noble metals and mercury, from waste solutions |
| 05/29/1991 | CN1051760A Process for separating gallium from basic solutions |
| 05/28/1991 | US5019363 Tributyl Phosphate |
| 05/28/1991 | CA2030900A1 Processes to recoverand reconcentrate gold from its ores |
| 05/28/1991 | CA1284471C Separation process |
| 05/22/1991 | EP0428194A1 Process for treating Jarosite containing residues |
| 05/22/1991 | CN1051590A Technology for extracting chloroauric acid (gold chloride) from gravel |
| 05/21/1991 | US5017346 Leaching with sulfur dioxide |
| 05/16/1991 | DE3937468A1 Re-extn. of iron from organic soln. contg. citrate ester extractant - by pptn. in the aq. phase as iron phosphate by mixing with aq. phosphoric acid at 50-90 deg. C and iron:acid mol. ratio 1:2-4 |
| 05/15/1991 | CN1051369A Synthesis of resin for selectively absorbing gold and the extraction method |
| 05/14/1991 | US5015448 Particulate material suitable for selectively separating metal cations from aqueous solutions, process for its production, and use thereof |
| 05/14/1991 | US5015447 Recovery of rare earth elements from sulphurous acid solution by solvent extraction |
| 05/08/1991 | EP0426143A1 Process and apparatus for extracting metals from ores and deposits |
| 05/08/1991 | CN1051133A Prepn of ultrafine tungsten powder |
| 05/07/1991 | US5013359 Oxidized with nitric acid, froth flotation |
| 05/07/1991 | CA1283772C Leaching solution distribution arm and control therefor |
| 05/03/1991 | CA2002183A1 Noble metal recovery process |
| 05/02/1991 | EP0425102A1 Method for eluting adsorbed gold from carbon |
| 05/02/1991 | EP0424736A1 Process for the recuperation of rhodium from residues of the destillation of products from oxosynthesis |
| 04/30/1991 | US5011666 Method for purifying TiO2 ore |
| 04/30/1991 | US5011665 Nonpolluting recovery of rare earth values from rare earth minerals/ores |
| 04/30/1991 | CA1283523C Method of purifying tantalum |
| 04/25/1991 | CA2027973A1 Method of reprocessing jarosite-containing residues |
| 04/21/1991 | CA2025161A1 Method for selectively recovering lead, zinc and calcium from materials in which they are contained as oxide or salts not soluble in water |
| 04/19/1991 | WO1991005859A1 Polymer bead containing immobilized metal extractant |
| 04/18/1991 | WO1991005068A1 Convection elution |
| 04/17/1991 | EP0422970A1 Method of treating rare-earth minerals |
| 04/17/1991 | CN1012377B Method for recovering silver from waste emulsion and film |
| 04/17/1991 | CN1012355B Processing method for mineral materials containing copper oxide |
| 04/16/1991 | US5008017 Mixing silver containing sludge with metal bicarbonate and carbonates to form free-flowing powder |
| 04/16/1991 | US5008016 Liquid/liquid extraction of gallium values from basic aqueous solutions thereof |
| 04/16/1991 | US5007620 Apparatus for biological processing of metal-containing ores |
| 04/10/1991 | CN1050564A Method for sparation of gold and silver |
| 04/09/1991 | US5006320 Silver, gold and copper from iron ore, thiobacillus |
| 04/09/1991 | US5006262 Process for recovering copper from copper ion containing aqueous solutions |
| 04/09/1991 | US5006254 Extraction with halogenated beta-diketone |
| 04/09/1991 | US5006166 Recovery of noble metals |
| 04/09/1991 | US5005806 Controlled percolation system and method for heap leach mining |
| 04/03/1991 | CN1050411A Comprechensive utilization of serpentine tailings |
| 04/03/1991 | CN1050367A Process for preparing nickel sulfate |
| 04/02/1991 | US5004212 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 03/30/1991 | CA2026249A1 Method for eluting adsorbed gold from carbon |
| 03/27/1991 | CN1050222A Inversion method for processing zn-bearing mineral |
| 03/21/1991 | WO1991003424A1 Biomining of gallium and germanium containing ores |
| 03/20/1991 | EP0418125A1 Process for treating ores containing rare earths |
| 03/19/1991 | CA2025116A1 Method for gold recovery using chlorine dioxide solution |
| 03/19/1991 | CA1281552C Further improvements in tungsten recovery |
| 03/14/1991 | CA2025152A1 Processing of ores containing rare-earth elements |
| 03/14/1991 | CA2025151A1 Processing of ores containing rare-earth elements |
| 03/12/1991 | US4999171 Process for recovery of gallium by chelate resin |
| 03/05/1991 | US4997533 Electrolysis, circulation |
| 03/05/1991 | US4997532 Process for extracting noble metals |
| 03/05/1991 | US4997166 Silver recovery system |
| 02/19/1991 | CA2023211A1 Process for the recovery of gold |
| 02/19/1991 | CA1280278C Method for distributing an aqueous solution containing a peroxygen in clay |
| 02/16/1991 | CA2023119A1 Extraction of noble metals with thiourea |
| 02/13/1991 | EP0412935A1 Method of recycling non-sorted mixtures of used button cells and other metallic objects and further recuperating their metallic components |
| 02/13/1991 | CN1049188A Recovery of scandium, yttrium and lanthanides from titanium ore |
| 02/13/1991 | CN1049141A Roasting technology of making vanadium pentoxide |
| 02/13/1991 | CN1011581B Production of elements and compounds by deserpentinization of ultramatic rock |
| 02/12/1991 | US4992248 Method for neutralizing sulfuric acid containing zinc ion |
| 02/12/1991 | US4992207 Composition for extraction of metal ions and oxanions |
| 02/12/1991 | US4992179 Contacting aqueous solution containing metal cation with causticized, immobilized bacillus biomass, separation |
| 02/12/1991 | US4992097 Metal recovery process |
| 02/12/1991 | CA1279994C Tungsten recovery |
| 02/09/1991 | CA2022763A1 Process for recycling an unsorted mixture of spent button cells and/or other metallic objects and for recovering their metallic components |
| 02/08/1991 | CA2022296A1 Process for extracting oxygen and iron from iron oxide-containing ores |
| 02/07/1991 | DE4002728C1 Sepg. copper from ammonium molybdate - comprises precipitating copper ions using sulphide precipitating agent |
| 02/05/1991 | WO1991002097A1 Ion flotation with non-ionic reagents |
| 02/05/1991 | US4990674 Synthesis of aliphatic aromatic phosphine oxides |
| 02/05/1991 | US4990639 Oxidation of rhodium complex to water insoluble carboxylic acid salt; solvent extraction |
| 02/05/1991 | CA2064560A1 Ion flotation with non-ionic reagents |
| 02/04/1991 | CA2022600A1 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 01/30/1991 | CN1048889A Extracting and emulsifying method by eliminating iridium concentrate acid solution |
| 01/30/1991 | CN1048888A Glod extracting process |
| 01/30/1991 | CN1011420B Method using composite extractant to produce high-pure gold |
| 01/29/1991 | US4988487 Demetallization, reduction, leaching, digestion, precipitation, oxidation |
| 01/23/1991 | EP0276209B1 Process for separating arsenic from acid solutions which contain it |
| 01/23/1991 | CN1011294B Process for dressing copper oxide ore |
| 01/22/1991 | WO1991001273A1 Method of making metal stannates |
| 01/22/1991 | US4987081 Chemical/biological process to oxidize multimetallic sulphide ores |
| 01/22/1991 | US4986970 Method for removal of heavy metals, especially cadmium, from phosphoric acid containing solutions |