| Patents for C22B 34 - Obtaining refractory metals (6,435) |
|---|
| 06/21/1989 | EP0320682A2 Process for the production of titanium dioxide |
| 06/20/1989 | US4840774 Chlorination in presence of carbon and binder; purity, free of silicon tetrachloride |
| 06/15/1989 | WO1989005363A1 Vanadium compound dissolution processes |
| 06/14/1989 | EP0319857A1 Method for producing titanium fluoride |
| 06/14/1989 | EP0319663A2 Bidirectional control signalling bus interface apparatus for transmitting signals between two bus system |
| 06/13/1989 | US4839904 Apparatus for the melting of metals |
| 06/07/1989 | EP0319385A1 Device and process for trapping gaseous compounds of refractory metals and pumping plant containing the device |
| 06/06/1989 | CA1255071A1 Process for the preparation of titanium dioxide |
| 05/31/1989 | EP0318231A1 Process for recovering titanium dioxide fines |
| 05/31/1989 | EP0317857A1 Process for the preparation of titanium dioxide |
| 05/30/1989 | US4834793 Oxidation process for releasing metal values in which nitric acid is regenerated in situ |
| 05/18/1989 | WO1989004379A1 Microwave irradiation of mineral ores and concentrates |
| 05/17/1989 | EP0315985A2 Improved fluidized bed process for chlorinating titanium-containing material |
| 05/16/1989 | US4830665 Process and unit for preparing alloyed and non-alloyed reactive metals by reduction |
| 05/10/1989 | EP0314987A2 Green chrome oxide, process of preparation and use |
| 05/03/1989 | EP0313715A1 Process for treating, thereby saving energy and material, diluted acid released during the production of titanium dioxide according to the sulphate process |
| 04/27/1989 | DE3735107A1 Process for removing silica from alkali metal zirconosilicates (alkali metal zirconium silicates) |
| 04/11/1989 | US4820339 Production of metal powders by reduction of metal salts in fused bath |
| 04/11/1989 | CA1252297A1 Process of treating dissociated zircon |
| 03/28/1989 | US4816236 Blending with alkali metal source, roasting, fusing, leaching with water, and filtration |
| 03/23/1989 | WO1989002477A1 Method of charging ore in melt-reduction |
| 03/21/1989 | US4814150 Process for the high-yield recovery of vanadium from petroleum combustion residues |
| 03/21/1989 | US4814149 Solvent extraction, stripping, purification |
| 03/08/1989 | EP0305502A1 Process for the production of group ivb transition metal-alkali metal-fluoride salts and purification thereof |
| 03/01/1989 | CN1031400A Method of producing low oxygen-content chromium powder |
| 02/28/1989 | US4808384 Acid digestion, reduction, separation, extraction, stripping; precipitating impurities |
| 02/23/1989 | WO1989001532A1 Process for melt reduction of cr starting material and melt reduction furnace |
| 02/07/1989 | US4803061 Desulfurization, demetallization |
| 02/01/1989 | EP0301261A2 Process for working up metal sulphate mixtures containing ferrous sulphate |
| 02/01/1989 | CN1030792A Recovery of vanadium oxide |
| 01/18/1989 | EP0299791A1 Method for producing metallic titanium and apparatus therefor |
| 01/17/1989 | US4798717 Production of elements and compounds by deserpentinization of ultramafic rock |
| 01/17/1989 | US4798709 Recovering vanadium, pressure leaching |
| 01/17/1989 | US4798708 Process for recovering chromium and other metal values from chromium bearing material |
| 01/17/1989 | CA1248736A1 Apparatus for reducing iron and vanadium in phosphoric acid solution |
| 01/11/1989 | EP0298763A2 Method for recovering titanium |
| 01/11/1989 | EP0298698A1 Method for producing a metal from its halide |
| 01/10/1989 | US4797163 Process for the production of titanium dioxide pigments |
| 01/04/1989 | EP0297275A1 Process for producing titaniumdioxide |
| 12/27/1988 | US4793854 Highly pure titanium and process for producing the same |
| 12/14/1988 | CN88103911A Method and apparatus for carrying out thermochemical process |
| 12/06/1988 | CA1245864A1 Process for reduction of zirconium, hafnium or titanium using a zinc or tin seal |
| 12/06/1988 | CA1245863A1 Continuous reactive metal reduction using a salt seal |
| 12/01/1988 | WO1988009391A1 Process for making zero valent titanium from an alkali metal fluotitanate |
| 12/01/1988 | WO1988009390A1 Process and device for implementing hot chemical processes |
| 11/29/1988 | US4788044 Method for recovering vanadium from residues from the combustion of petroleum fractions |
| 11/29/1988 | CA1245457A1 Recovery of tungsten from ammoniacal solutions |
| 11/29/1988 | CA1245456A1 Process for the recovery of molybdenum-99 from an irradiated uranium alloy target |
| 11/23/1988 | EP0292469A1 Process and apparatus for high-temperature chemical operations |
| 11/22/1988 | EP0270637A4 Manufacture of high purity zirconia from low-silica zirconiferous materials. |
| 11/15/1988 | US4784688 Tungsten recovery |
| 11/15/1988 | US4784687 Hydrogen peroxide and promoters for multistage extraction |
| 11/09/1988 | EP0290308A1 Process for the recuperation of vanadium |
| 11/09/1988 | EP0289537A1 Process for the production of zirconium sulphate. |
| 11/08/1988 | US4783219 Blowing in oxygen while molten metal is being stirred |
| 11/01/1988 | US4781565 Apparatus for obtaining silicon from fluosilicic acid |
| 10/25/1988 | US4780302 Reacting titanium and fluosilick acid; dissolving and precipitating with alkali metal compound |
| 10/20/1988 | DE3711371A1 Process for winning V2O5 |
| 10/13/1988 | DE3710725A1 Process for the direct treatment of rhenium-containing molybdenum sulphides with ammonia |
| 09/28/1988 | EP0283600A1 Landfill disposal of material containing vanadium |
| 09/27/1988 | CA1242327A1 Process for removing metals from aluminosilicate materials |
| 09/22/1988 | WO1988007191A1 Process for the production of group ivb transition metal-alkali metal-fluoride salts and purification thereof |
| 09/20/1988 | US4772316 Process for the reduction of iron-containing chrome ores |
| 09/13/1988 | US4770948 High-purity metal and metal silicide target for LSI electrodes |
| 08/30/1988 | US4767454 Calcining mixture of chromium and calcium oxides in oxygen; comminution and metallothermal reduction |
| 08/30/1988 | US4766658 Controlled heating-to produce high purity zirconium lining |
| 08/09/1988 | US4762695 Methods for preparing high-purity molybdenum or tungsten powder and high-purity oxides powder of the same |
| 08/09/1988 | US4762552 Reduction and leaching at high temperature |
| 08/03/1988 | EP0276544A1 Method for induction melting reactive metals and alloys |
| 08/03/1988 | CN86108218B One time vanadium dregs roasting in rotary furnace and extraction of vanadium by the aquo-soaking |
| 07/27/1988 | EP0125259B1 Improvement in entrained downflow chlorination of fine titaniferous material |
| 07/26/1988 | US4759916 Process for preparing a pigmentary titanium dioxide |
| 07/05/1988 | CA1238803A1 Group ivb transition metal based metal and processes for the production thereof |
| 06/30/1988 | DE3743096A1 Chlorierung metallurgischer zusammensetzungen Chlorination metallurgical compositions |
| 06/29/1988 | EP0272294A1 Preparation of hydrolysed zirconium salt precursors and high purity zirconia. |
| 06/29/1988 | CN87108130A Chlorination of metallurgical composites |
| 06/21/1988 | US4752331 Magnesium reducing agent; separating formed magnesium chloride |
| 06/15/1988 | EP0270637A1 Manufacture of high purity zirconia from low-silica zirconiferous materials. |
| 06/14/1988 | US4751070 Low temperature synthesis |
| 06/14/1988 | CA1237900A1 Method for leaching and recovering vanadium from vanadium bearing by-product materials |
| 06/08/1988 | EP0270453A1 Process for separating the technetium contained in an organic solvent comprising zirconium and at least one other metal such as uranium or plutonium, especially for use in reprocessing irradiated nuclear fuels |
| 06/07/1988 | US4749448 Reduced solvent viscosity; low temperature stripping, corrosion resistance, minimal carryover |
| 06/07/1988 | US4749409 Method of purifying refractory metal |
| 06/01/1988 | CN86100031B Processing of calcium-contg. tungstenic ore |
| 05/31/1988 | US4748009 Method of recovering vanadium from vanadium-containing materials with at least 6 wt % oxidic vanadium compounds |
| 05/24/1988 | US4746497 Process for the production of high purity zirconia |
| 05/19/1988 | WO1988003697A1 Rhenium generator system and method for its preparation and use |
| 05/05/1988 | WO1988003128A1 Process for the production of zirconium sulphate |
| 05/03/1988 | CA1235879A1 Two stage chlorination of titaniferous ore with fecl.sub.3 reclamation |
| 04/26/1988 | US4740239 Controlled reduction in rotary kiln |
| 04/19/1988 | US4738713 In segmented metal crucible using alternating current |
| 04/14/1988 | DE3635010A1 Production of synthetic anatase from ilmenites using dilute acid |
| 04/12/1988 | US4737244 Zirconium and hafnium tetrachloride separation by extractive distillation with molten zinc chloride lead chloride solvent |
| 04/12/1988 | US4737187 Method of treating nickel-containing and vanadium-containing residues |
| 04/12/1988 | CA1234990A1 Process of producing an tio.sub.2 concentrate from tio.sub.2-containing starting materials |
| 04/06/1988 | EP0262963A2 Process for recovering vanadium-free molybdenum from solution |
| 03/29/1988 | CA1234496A1 Process for combination metal reduction and distillation |
| 03/23/1988 | EP0261042A1 Process and apparatus for producing zirconium metal by reducing zirconium tetrachloride |
| 03/23/1988 | CN87105337A Mineral treatment |
| 03/22/1988 | US4732827 Process for producing electrolyte for redox cell |