| Patents for C22B 34 - Obtaining refractory metals (6,435) |
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| 07/14/1981 | US4278642 Sulfidizing |
| 07/14/1981 | US4278641 Distillation, ion exchanging |
| 07/14/1981 | CA1104836A1 Titanium or zirconium reduction process by arc heater |
| 07/14/1981 | CA1104830A1 Recovery of molybdenum from uranium liquors |
| 07/08/1981 | EP0031507A1 Process for the preparation of a hydrolysable titanyl sulphate solution |
| 07/01/1981 | EP0031064A2 Process for treating leaching tailings obtained during the preparation of titanium dioxide |
| 07/01/1981 | EP0031062A2 Leaching of ternary starting mixtures |
| 06/30/1981 | US4276266 Process for recovering metal elements from carbonaceous products |
| 06/30/1981 | US4276083 Recovery of metal values from a metal bearing source of nickel and vanadium |
| 06/30/1981 | CA1103933A1 Method of upgrading a titaniferous ore utilising reductive roasting |
| 06/23/1981 | US4275041 Process for manufacturing a stable titanyl sulfate solution |
| 06/23/1981 | US4275040 Process for extracting titanium values from titaniferous bearing material |
| 06/16/1981 | CA1103034A1 Process for recovering molybdenum from waste |
| 06/10/1981 | EP0029879A2 Process and apparatus for the thermal recovery of metallic carbides or metals |
| 06/09/1981 | US4272343 Process for the electrolytic reductive leaching of ilmenite ore |
| 06/09/1981 | CA1102556A1 Production of titanium metal values |
| 06/03/1981 | EP0029699A1 Chlorination of titaniferous ore using porous carbon |
| 05/28/1981 | WO1981001404A1 Chlorination of titaniferous ore using porous carbon |
| 05/26/1981 | US4269809 Recovery in titanium metal values by solvent extraction |
| 05/26/1981 | US4269619 Using a nozzle to discharge treated ores as well as to charge with fluid to remove solids |
| 05/20/1981 | EP0028648A1 Method for recovering molybdenum from tungsten solutions. |
| 05/06/1981 | EP0027868A1 Process for the oxidative disintegration of ores containing chromium |
| 04/21/1981 | CA1099521A1 Method of producing vanadium |
| 04/07/1981 | US4260414 Process for recovering and utilizing useful substances from molten metal produced during reduction treatment of steel slag |
| 04/07/1981 | CA1098715A1 Purifying molybdenum flotation concentrates |
| 04/07/1981 | CA1098714A1 Process for recovering vanadium accumulated on spent catalyst |
| 03/31/1981 | US4259296 Recovery of chromium from scrap |
| 03/17/1981 | US4256702 Ion exchanging with ammonium resin |
| 03/17/1981 | US4256266 Process to obtain anathase concentrates from an anathase ore |
| 03/10/1981 | US4255397 Reducing oxidation time, sodium carbonate |
| 02/24/1981 | CA1096177A1 Chlorination of ilmenite |
| 02/17/1981 | US4251266 Method for taking care of metallic waste products by remelting |
| 02/10/1981 | US4249989 Isolating solid substances from a vapor and gas mixture and pulps |
| 02/10/1981 | CA1095257A1 Recovery of vanadate compounds from aqueous solutions |
| 02/04/1981 | EP0023428A1 Liquid-liquid process for extracting metals using organo-phosphorous compounds |
| 02/03/1981 | CA1094818A1 Process for the separation of recuperable values in titanium residues in sulphate form |
| 02/03/1981 | CA1094814A1 Recovery of vanadium values |
| 02/03/1981 | CA1094813A1 Recovery of chromium values |
| 02/03/1981 | CA1094781A1 Hydrometallurgical processing for molybdenite ore concentrates |
| 01/27/1981 | US4247523 Pelletizing sulfation of titanium concentrates |
| 01/27/1981 | CA1094327A1 Metal extraction process |
| 01/20/1981 | US4246022 Processing metal chlorides |
| 01/20/1981 | US4246012 Apparatus for isolating titanium tetrachloride |
| 01/20/1981 | CA1093829A1 Chlorination of titanium slags |
| 01/20/1981 | CA1093828A1 Treatment of tri(alkaline earth metal tungstates with organic amines) |
| 01/13/1981 | US4244929 Recovery of chlorine values |
| 01/13/1981 | US4244926 Moving bed chlorination of bauxite and ilmenite |
| 01/13/1981 | US4244925 By reaction with alkali metal salt |
| 01/06/1981 | US4243639 Gasification, leaching alkali metal vanadates |
| 01/06/1981 | US4243179 Process for preparation of raw material minimizing the size degradation of anatase ore |
| 12/30/1980 | US4242312 Removal of sodium sulfate from a sulfate-containing sodium chloride solution in a process for separating zirconium and hafnium |
| 12/30/1980 | US4242136 Process for producing metallic zirconium |
| 12/23/1980 | US4241028 Sorption of tungsten from alkaline solutions |
| 12/23/1980 | US4241027 Reductive stripping process for the recovery of either or both uranium and vanadium |
| 12/09/1980 | CA1091040A1 Method of recovering metals out of soot originating from the combustion of oil |
| 12/02/1980 | US4236918 Recovery of elemental sulfur and metal values from tailings from copper recovery processes |
| 11/27/1980 | WO1980002554A1 Method for recovering molybdenum from tungsten solutions |
| 11/26/1980 | EP0019431A2 A method for recovering vanadium from petroleum coke |
| 11/25/1980 | US4235623 Chrome ore and coke |
| 11/25/1980 | CA1090140A1 Conversion of molybdenite concentrate to ferro- molybdenum and simultaneous removal of impurities by direct reduction with sulfide forming reducing agents |
| 11/18/1980 | US4234333 Process for recovering metal carbide powder from cemented carbides |
| 11/04/1980 | US4231790 Process for the preparation of tantalum and niobium powders of improved efficiency |
| 11/04/1980 | CA1088883A1 Beneficiation of heavy minerals from bituminous sands residues by dry screening |
| 10/28/1980 | CA1088316A1 Ore halogenation process |
| 10/21/1980 | US4229399 Process for pelletizing and neutralizing solid mixtures of metal chlorides |
| 10/15/1980 | EP0017285A1 Process for the recovery of metals from catalysts used in the hydrodesulfurization of hydrocarbons |
| 10/07/1980 | US4226836 Method for separating molybdenum values from sea nodules |
| 10/01/1980 | EP0016516A1 Process for upgrading iron-containing materials and the product obtained by this process |
| 10/01/1980 | EP0015938A1 Recovery of elemental sulfur and metal values from tailings from copper recovery processes |
| 09/30/1980 | US4225563 Process and apparatus for continuous leaching of ores |
| 09/30/1980 | US4225396 Vanadium and uranium oxidation by controlled potential electrolysis |
| 09/16/1980 | US4222872 Reclamation of molybdenum or other heavy metals from wastewater treatment skimmings |
| 09/16/1980 | CA1085589A1 Recovery of chlorine values from iron chloride by- produced in chlorination of ilmenite and the like |
| 09/16/1980 | CA1085584A1 Process for selectively recovering metal chlorides from gaseous effluent |
| 09/09/1980 | US4221588 Oxidation roasting of ore |
| 09/09/1980 | CA1085137A1 Process for the production of aluminum chloride and related products |
| 09/02/1980 | CA1084669A1 Process for producing a synthetic rutile from ilmenite |
| 08/26/1980 | CA1084275A1 Method of reducing zirconium |
| 08/19/1980 | CA1083825A1 Process for concentration of titanium ore |
| 08/12/1980 | CA1083742A1 Stabilized mannich-base substituted water-in-oil polymer dispersions |
| 08/12/1980 | CA1083357A1 Method of separating hafnium from zirconium |
| 08/05/1980 | US4216118 Process for recovering vanadium accumulated on spent catalyst |
| 08/05/1980 | US4215989 Process for chrome recovery from industrial waste and the like, as from chrome-ladened tannery waste, including pollution control of the same |
| 07/15/1980 | US4212849 Simultaneous extraction and recovery of uranium and vanadium from wet process acids |
| 07/15/1980 | CA1081620A1 Filtration of solid-containing titanyl sulfate solutions |
| 07/08/1980 | US4211755 Process for beneficiating titaniferous ores |
| 07/08/1980 | US4211754 Oxidation |
| 07/08/1980 | US4211753 Iron hydroxide ammonium molybdate complex |
| 06/17/1980 | CA1079488A1 Treatment method of raw materials containing titanium |
| 06/10/1980 | CA1079095A1 Vacuum smelting process for producing ferromolybdenum |
| 06/03/1980 | US4206021 Ferrous sulfate anolyte |
| 05/28/1980 | EP0011475A1 Recovery of tungsten values from tungsten-bearing materials |
| 05/27/1980 | US4204973 Barium chromate |
| 05/20/1980 | US4203759 Process for the preparation of a vanadium-containing metallic ash concentrate |
| 05/20/1980 | CA1077725A1 Process for obtaining metal values by leaching raw sea nodules |
| 05/13/1980 | US4202863 Separation of iron metal values from titanium metal values |
| 05/13/1980 | CA1077239A1 Ilmenite oxidation in a carbon-containing fluidized bed |
| 04/29/1980 | US4200612 Process for recovering acids and zirconium contained in pickling solutions |
| 04/29/1980 | CA1076362A1 Process for the recovery of vanadium and molybdenum |
| 04/22/1980 | US4199552 Process for the production of synthetic rutile |