| Patents for C22B 34 - Obtaining refractory metals (6,435) |
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| 07/28/1982 | EP0056742A1 Recovery of molybdenum from spent catalyst solutions from hydroperoxide epoxidations |
| 07/28/1982 | EP0056740A1 Production of a solid molybdenum precipitate from a spent molybdenum epoxidation catalyst solution |
| 07/28/1982 | EP0056715A1 Chemical treatment of low-grade wolframite concentrate having high Mo/W03 ratio |
| 07/28/1982 | EP0056714A2 Separation of trace molybdenum from tungstate solutions |
| 07/20/1982 | US4340571 Process for chrome recovery from industrial waste and the like, as from chrome-ladened tannery waste |
| 07/06/1982 | US4338287 Process for conditioning tungsten concentrates |
| 07/06/1982 | US4338126 Recovery of tungsten from heavy metal alloys |
| 06/29/1982 | US4337227 Recovery of chromium from waste solutions |
| 06/15/1982 | US4334925 Of reduced copper content |
| 06/15/1982 | US4334924 Reduction of slag with iron-sulfur, removal of sulfur and iron by oxidation |
| 06/01/1982 | US4332615 Chlorinating to remove iron oxide |
| 05/26/1982 | EP0052354A2 Process for preparing metals from their fluorine-containing compounds |
| 05/25/1982 | US4331475 Process for aluminothermic production of chromium and chromium alloys low in nitrogen |
| 05/18/1982 | CA1123807A1 Process for preparation of raw material minimizing the size degradation of anathase ore |
| 05/11/1982 | US4329322 Chlorination of titaniferous material using treated coal for vanadium removal |
| 05/04/1982 | US4328191 Process for the recovery of molybdenum from spent catalysts |
| 04/20/1982 | US4325920 Method to oxidize Ti+3 during the sulfuric acid digestion of titaniferous slags |
| 04/20/1982 | US4325919 Autoclave soda digestion of scheelite concentrates with feedback control |
| 04/13/1982 | US4324764 Apparatus for continuous leaching of ores |
| 04/13/1982 | US4324582 Process for the recovery of copper from its ores |
| 04/13/1982 | CA1121603A1 High temperature ore reduction with a liquor containing essentially a soluble bicarbonate |
| 04/07/1982 | EP0049064A1 Recovery of vanadium |
| 04/06/1982 | CA1121527A1 Process for chrome recovery from industrial waste and the like, including pollution control of the same |
| 03/24/1982 | EP0047799A1 Improved method for production of alkali metal chromates from chrome ores |
| 03/23/1982 | US4321237 Treating hydrolysis residues from preparation of titanium dioxide |
| 03/23/1982 | US4321236 Process for beneficiating titaniferous materials |
| 03/23/1982 | US4321152 Grinding of titaniferous ores to enhance recovery of titanium dioxide |
| 03/23/1982 | US4321089 Process for the recovery of molybdenum and rhenium from their sulfide ores |
| 03/17/1982 | EP0047665A1 Improvements in or relating to metal distillation |
| 03/17/1982 | EP0047664A1 Improvements in or relating to apparatus for reacting chemicals |
| 03/16/1982 | US4320097 Recovery of vanadium from acidic solutions thereof |
| 03/16/1982 | US4320096 Combined autoclave soda digestion of wolframite and scheelite |
| 03/16/1982 | US4320095 Autoclave soda digestion of refractory scheelite concentrates |
| 03/16/1982 | US4320094 Partitioning of refractory metals from oxidation resistant scrap alloy |
| 03/09/1982 | US4318788 From chromium-iron hydroxide sludge |
| 03/02/1982 | US4317801 Recovery of molybdenum from spent catalyst solutions from hydroperoxide epoxidations |
| 03/02/1982 | US4317543 Process for separating copper and iron minerals from molybdenite |
| 03/02/1982 | CA1119003A1 Process for extracting tungsten from alkali metal tungstate solutions |
| 02/16/1982 | US4315896 Recovery of molybdenum as an aqueous solution from spent catalyst |
| 02/16/1982 | CA1118213A1 Process to obtain anatase mechanical concentrates |
| 02/09/1982 | CA1117773A1 Processing metal chlorides |
| 02/09/1982 | CA1117771A1 Process and apparatus for continuous leaching of ores |
| 02/09/1982 | CA1117766A1 Process for beneficiation of titanium ores |
| 02/02/1982 | US4313913 Ilmenite having iron/iii/reducible to iron/ii/sulfate |
| 01/26/1982 | CA1116873A1 Process for beneficiating metal-bearing materials |
| 01/26/1982 | CA1116869A1 Recovery of copper from arsenic-containing metallurgical waste materials |
| 01/26/1982 | CA1116867A1 Process for beneficiating titaniferous material |
| 01/26/1982 | CA1116866A1 Separation of ilmenite and rutile |
| 01/19/1982 | CA1116582A1 Process for extracting vanadium from deactivated catalysts |
| 01/19/1982 | CA1116411A1 Process for the separation of uranium contained in an alkaline liquor, particularly a leach solution of an uraniferous ore |
| 01/19/1982 | CA1116409A1 Process for recovery of niobium values for use in preparing niobium alloy products |
| 01/13/1982 | EP0043646A1 Separation of chromium from scrap |
| 01/12/1982 | US4310495 Low-temperature fluid-bed chlorination of titaniferous ore |
| 01/12/1982 | US4310350 Recovering non-volatile metals from dust containing metal oxides |
| 01/12/1982 | CA1115960A1 Pelletizing sulfation of titanium concentrates |
| 01/05/1982 | US4309389 Pyrohydrolysis of fluoro acid complexes |
| 12/29/1981 | CA1115062A1 Purification of rutile |
| 12/22/1981 | US4307065 Precipitating ammonium molybdate |
| 12/16/1981 | EP0041841A1 Process for the recovery of metals from their ores |
| 12/15/1981 | US4305754 Chromium recovery from scrap alloys |
| 12/15/1981 | CA1114174A1 Recovery of elemental sulfur and metal values from tailings from copper recovery processes |
| 12/09/1981 | EP0041459A1 Process for the lixiviation of a niobium and/or tantalum ore containing calcium as main impurity |
| 12/08/1981 | US4304758 Slags, ilmenite |
| 12/01/1981 | US4303623 Sulfiding |
| 12/01/1981 | US4303622 Chemical treatment of low-grade wolframite concentrate having high Mo/WO3 ratio |
| 12/01/1981 | CA1113225A1 Recovery of chlorine values |
| 11/24/1981 | US4302243 Process for producing tantalum concentrates |
| 11/18/1981 | EP0039791A1 Method of producing sinterable titanium base alloy powder |
| 11/18/1981 | EP0039746A1 Process for treating zircon |
| 11/03/1981 | US4298582 Selectively dissolving a vanadate from its mixture with a tungstate and molybdate followed by reprecipitation |
| 11/03/1981 | US4298581 Process for recovering chromium, vanadium, molybdenum and tungsten values from a feed material |
| 11/03/1981 | CA1111655A1 Process for neutralizing solid mixtures of metal chlorides |
| 10/27/1981 | US4297131 Low-temperature chlorination of titanium oxide-containing ores by sulfonyl chloride vapors |
| 10/21/1981 | EP0038106A1 Process for reclaiming chromium from roasted chromium ash containing hexavalent chromium |
| 10/21/1981 | EP0038105A2 Process for improving the conversion of trivalent chromium in ash to hexavalent chromium |
| 10/20/1981 | US4296077 Recovery of molybdenum values from leach muds |
| 10/20/1981 | US4296073 High temperature attack of ores by means of a liquor essentially containing a soluble bicarbonate |
| 10/20/1981 | US4295878 Processes of iron segregation |
| 10/20/1981 | CA1110828A1 Process for the purification of solutions containing carbonates, sulphates, possibly potassium or sodium hydroxide, and at least one of the metals vanadium, uranium, molybdenum |
| 10/06/1981 | CA1110221A1 Process for extracting vanadium from deactivated catalysts |
| 09/29/1981 | US4292282 Process for recovering metals from catalysts for the hydrodesulfurization of hydrocarbons |
| 09/29/1981 | US4291753 Scraper assembly for use with a fluidized bed condenser |
| 09/21/1981 | EP0028648A4 Method for recovering molybdenum from tungsten solutions. |
| 09/09/1981 | EP0035196A1 Process for producing titanium tetrachloride |
| 09/08/1981 | US4288418 Digesting ilmenite with dilute sulfuric acid, hydrolyzing and roasting titanyl sulfate intermediate |
| 09/08/1981 | US4288417 Process for manufacturing titanium dioxide |
| 09/08/1981 | US4288416 Process for manufacturing titanium compounds |
| 09/08/1981 | US4288415 Reacting sulfuric acid with titaniferous material; hydrolysis |
| 09/01/1981 | CA1108090A1 Recovery of variable valency metals from compounds in voltaic cell |
| 08/26/1981 | EP0034434A1 Process for removing metal values from oxidic materials |
| 08/26/1981 | EP0034348A1 Method of and apparatus for recovering tantalum from tantalum-containing scrap |
| 08/26/1981 | EP0034236A1 Separation of chromium from scrap |
| 08/25/1981 | US4285724 Continuous production of finely divided zirconium powder |
| 08/25/1981 | CA1107480A1 Acid and zirconium content extraction process from pickling solutions |
| 08/11/1981 | CA1106612A1 Production of titanium metal values |
| 07/28/1981 | US4280839 Recovery of metal values from a metal bearing source of nickel and vanadium |
| 07/21/1981 | US4279871 Process for treating chlorinated titaniferous material to remove vanadium |
| 07/21/1981 | US4279640 Process for upgrading iron-containing materials |
| 07/21/1981 | CA1105238A1 Treatment of gases and vapors from sulfuric acid digestion of titaniferous materials |
| 07/14/1981 | US4278644 Process for partitioning Mo and W from a mixed CaMoO4 -CaWO4 precipitate |