| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 09/08/1987 | CA1226581A1 Process for the selective extraction of copper using 4-acyl(3h)-pyrazol-3-ones |
| 09/08/1987 | CA1226539A1 Construction of arsenic resistance vectors for thiobacillus ferrooxidans |
| 09/02/1987 | EP0233918A1 Process for metal recovery and compositions useful therein |
| 09/02/1987 | CN87100396A Catalyst recovery process |
| 09/02/1987 | CN86107005A Method of recovering noble metals from concentrated mineral |
| 09/01/1987 | US4690894 Treatment of microorganisms with alkaline solution to enhance metal uptake properties |
| 08/26/1987 | EP0233498A2 Process and apparatus of photoelectrocalalytically reducing noble metals in a nitric acid solution |
| 08/19/1987 | EP0233121A1 Process for removing lead from rare earths |
| 08/19/1987 | EP0232766A2 Process for eliminating heavy metals from mineral acids |
| 08/18/1987 | US4687514 Process for the recovery of noble metals from solutions |
| 08/18/1987 | CA1225652A1 Solvent extraction of cobalt using hydroxamic acids |
| 08/13/1987 | WO1987004694A1 Method and apparatus for biological processing of metal-containing ores |
| 08/12/1987 | EP0231558A1 Separation apparatus |
| 08/12/1987 | EP0148194B1 High temperature pre-treatment by means of an aqueous alcolyne solution of clayish gangue ore containing at least one valuable element |
| 08/11/1987 | US4686019 In nitric acid |
| 08/11/1987 | CA1225302A1 Dewatering of mineral slurries |
| 08/11/1987 | CA1225243A1 Winning metal from ore |
| 08/11/1987 | CA1225241A1 Process of recovering copper and of optionally recovering silver and gold by a leaching of oxide- and sulfide-containing materials with water-soluble cyanides |
| 08/05/1987 | EP0230906A2 Process for the recovery of iodine and noble metal catalyst |
| 08/05/1987 | CN86106986A Leaching process |
| 08/05/1987 | CN86102510A Metal recovery cell |
| 08/04/1987 | US4684404 Extraction of gold from ores |
| 08/04/1987 | CA1224926A1 Method for working-up complex sulphidic ore concentrates |
| 07/28/1987 | US4683310 Recovering metals from ores |
| 07/21/1987 | CA1224335A1 High temperature pre-treatment, by means of an alkaline aqueous solution, for minerals having a clayey brood containing at least one upgradable element |
| 07/14/1987 | US4680168 Extraction of Group 8 metals from organic solutions |
| 07/14/1987 | US4680098 Electrodialysis |
| 07/14/1987 | CA1224047A1 Selective extraction of rhenium from aqueous sulfuric acid solutions |
| 07/08/1987 | EP0227893A2 Method of removing metal contaminants from solutions |
| 07/07/1987 | CA1223741A1 Extraction of silver and palladium metals from aqueous solutions using tertiary phosphine sulfides |
| 06/30/1987 | US4676828 Process for the leaching of sulphides containing zinc and iron |
| 06/24/1987 | EP0226295A2 Method for prevention of metallic precipitate reoxidation/redissolution in aqueous systems |
| 06/23/1987 | US4675172 Copper, cadmium, cobalt, zinc |
| 06/23/1987 | CA1223242A1 Copper recovery from ammoniacal solutions using extraction mixture |
| 06/23/1987 | CA1223185A1 Dissolution of noble metals |
| 06/23/1987 | CA1223126A1 Process for recovering zinc from ferrites |
| 06/23/1987 | CA1223125A1 Direct recovery of precious metals by solvent extraction and selective removal |
| 06/16/1987 | US4673554 Method of purifying tantalum |
| 06/16/1987 | CA1222871A1 Elimination of iron from leaching solutions |
| 06/10/1987 | CN86106147A Production of elements and compounds by deserpentinization of ultramafic rock |
| 06/09/1987 | US4671945 Method for separation and leaching of the valuable metals in sulphide materials |
| 06/09/1987 | US4671821 Extracting cobalt from aqueous solutions containing nickel with mono-ester of benzylphosphonic acid |
| 06/03/1987 | EP0224239A2 Process for preparing finely divided metal powders |
| 06/02/1987 | US4670230 Using alkyl phosphoric acid compound and petroleum hydrocarbon diluent |
| 06/02/1987 | US4670051 Oxidation process for releasing metal values in which nitric acid is regenerated in situ |
| 05/26/1987 | US4668397 Cyclodimerization, tetrapeptides |
| 05/20/1987 | CN86101938A Preparation of stannic oxide from medium grade tin ore by liquid phasing oxidization |
| 05/19/1987 | US4666686 Process for the fluid-fluid extraction of gallium, germanium or indium from liquid solutions |
| 05/19/1987 | US4666683 Process for removal of copper from solutions of chelating agent and copper |
| 05/19/1987 | US4666513 Process for the selective extraction of copper using 4-acyl-(3H)-pyrazol-3-ones |
| 05/19/1987 | US4666512 Method for recovering vanadium from vanadium-containing ore |
| 05/19/1987 | CA1221842A1 Treatment of ores |
| 05/13/1987 | EP0221760A2 Method for recovering metal values from mixed-metal aqueous solutions by selective phosphate precipitation |
| 05/13/1987 | EP0221136A1 Catalyst recovery process. |
| 05/12/1987 | US4664808 Membrane solvent extraction |
| 05/06/1987 | EP0220811A1 Process and apparatus for removing precious metals from solutions |
| 05/06/1987 | CN85107901A Recovery of gold from auriferous refractory iron-containing sulphidic ore |
| 05/06/1987 | CN85107774A Recovery of gold from refractory auriferous iron-containing sulphidic concentrate |
| 05/05/1987 | US4662613 Spiral exchange mass; replacement metal particles of high electromotive force |
| 05/05/1987 | CA1221244A1 Recovering metals from spent hydroprocessing catalysts |
| 04/28/1987 | EP0203189A4 Method of recovery of gold and other metals. |
| 04/28/1987 | CA1220945A1 Extracting chromium (iii) from aqueous solutions with 2-ethylhexyl acid phosphate |
| 04/21/1987 | US4659682 Recovery of noble metal values from carbonylation residues |
| 04/21/1987 | US4659551 Process for separation of neptunium from an organic phase in the recovery of irradiated fuel and/or fertile materials |
| 04/21/1987 | CA1220628A1 Process for recovering molybdenum and copper from sulfide concentrates |
| 04/15/1987 | CN85107626A Process for the pressure oxidation of acid leaching of non-ferrous metal and iron-containing sulphide |
| 04/14/1987 | US4657642 Direct gold electrolysis from a loaded organic phase |
| 04/14/1987 | CA1220345A1 Process for the recovery of noble metals from ores |
| 04/09/1987 | WO1987002068A1 Method for separation and recovery of metals from mixtures of metal sulfides such as lead ores |
| 04/07/1987 | US4656012 Process for the recovery of uranium from phosphoric acid solutions |
| 04/07/1987 | US4655936 Microbiological control in uranium processing |
| 04/07/1987 | US4655829 Metal recovery process |
| 04/07/1987 | CA1220037A1 Sonic device for extracting minerals from ore |
| 04/01/1987 | EP0216473A1 Extraction of cesium and strontium from nuclear waste |
| 03/31/1987 | US4654200 Processes for extracting radium from uranium mill tailings |
| 03/31/1987 | US4654145 Direct recovery of precious metals by solvent extraction and selective removal |
| 03/26/1987 | WO1987001734A1 Process for extracting zinc from silicate zinc ores |
| 03/26/1987 | WO1987001733A1 Process for extracting precious metals from ore concentrates |
| 03/26/1987 | WO1987001731A1 Production of elements and compounds by deserpentinization of ultramafic rock |
| 03/26/1987 | DE3533183A1 Verfahren zur gewinnung von zink aus silikatischen zinkerzen Process for the recovery of zinc from zinc silicate ores |
| 03/24/1987 | US4652309 Sonic method and apparatus for heap leaching |
| 03/18/1987 | EP0214324A1 Method for separation and leaching of the valuable metals in metal sulphide materials |
| 03/17/1987 | US4650649 Catalyst recovery process |
| 03/17/1987 | CA1219134A1 Process for the selective dissolution of lead from mixed minerals containing zinc |
| 03/12/1987 | WO1987001366A1 Process for purifying silver refinery slimes |
| 03/12/1987 | WO1987001303A1 Removal of inorganic contaminants from catalysts |
| 03/10/1987 | US4649031 Process for recovering rare metals from the combustion residue of coal by digestion |
| 03/10/1987 | US4649030 Solvent extraction; sulfuric acid; alkali metal, thallium or ammonium sulfate |
| 03/03/1987 | US4647440 Heteropolyacid adduct of crown ether |
| 03/03/1987 | US4647438 Separation of rare earth values by liquid/liquid extraction |
| 03/03/1987 | US4646674 Indicator device using metal salts of polyacetylenic compounds |
| 02/26/1987 | WO1987001139A1 Process for metal recovery and compositions useful therein |
| 02/25/1987 | EP0211305A2 Metal scavenging process |
| 02/25/1987 | CN86104680A Recovery of noble metal values from carbonylation residues |
| 02/24/1987 | US4645650 Acid reduction of oxide in presence of carbonaceous material |
| 02/24/1987 | CA1218237A1 Process for the recovery of indium by solvent extraction |
| 02/12/1987 | WO1987000867A1 Process for separating arsenic from acid solutions which contain it |
| 02/11/1987 | CN85106255A Method of extract scandium from rare-earth mineral |
| 02/10/1987 | US4642134 Activated oxygen frees bonded au, ag and group 8 metals for oxidation, chelation and leaching |
| 02/10/1987 | CA1217637A Process for recovering cesium from cesium ore |