| Patents for C22B 34 - Obtaining refractory metals (6,435) |
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| 03/16/1988 | CN85100737B Extraction of tungsten by using primary amine-neutral donor reagent |
| 03/15/1988 | US4731230 Process for the preparation of TiCl4 |
| 03/09/1988 | EP0258786A1 Process for preparing titanium dioxide pigments |
| 03/09/1988 | EP0258756A2 Apparatus and process for the preparation of titanium chloride |
| 03/02/1988 | EP0257373A2 Process for the preparation of titanium dioxide pigments |
| 03/01/1988 | US4728364 Electrode for the production of titanium articles that are free from low density inclusions |
| 03/01/1988 | US4727928 Process for the preparation of refined tantalum or niobium |
| 02/23/1988 | CA1233013A1 Recovery of vanadium oxide |
| 02/16/1988 | US4725312 Production of metals by metallothermia |
| 02/11/1988 | WO1988000869A1 Process for producing titanium metal and titanium metal alloys |
| 02/10/1988 | EP0255616A1 Process for preparing pure fine titanium dioxide |
| 02/02/1988 | US4722827 Zirconium and hafnium with low oxygen and iron |
| 02/02/1988 | US4722756 Method for deoxidizing tantalum material |
| 01/28/1988 | EP0236480A4 Production of hydrogen by deserpentinization of ultramafic rock. |
| 01/26/1988 | US4721606 Recovery of metal values from spent catalysts |
| 01/26/1988 | CA1231840A1 Method for precipitating vanadium from vanadium bearing liquors and recovering vanadium pentoxide |
| 01/20/1988 | EP0253183A2 Process for the preparation of TiCl4 |
| 01/19/1988 | US4720300 Process for producing niobium metal of an ultrahigh purity |
| 01/19/1988 | CA1231535A1 Process for the chlorination of oxidic materials |
| 01/19/1988 | CA1231534A1 Treatment for spent petroleum cracking catalyst |
| 01/14/1988 | WO1988000249A1 Tungsten extraction from ore |
| 01/13/1988 | CN86101520A Extraction method of separating tungsten and molybdenum |
| 01/12/1988 | US4718996 Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material |
| 01/12/1988 | US4718995 Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material |
| 01/12/1988 | US4718477 Apparatus and method for processing reactive metals |
| 01/07/1988 | EP0210236A4 Process for the production of high purity zirconia. |
| 01/05/1988 | CA1230975A1 Process for dissolving tantalum/columbium materials containing alkali metal impurities |
| 12/30/1987 | WO1987007915A1 Manufacture of high purity zirconia from low-silica zirconiferous materials |
| 12/30/1987 | WO1987007885A1 Preparation of hydrolysed zirconium salt precursors and high purity zirconia |
| 12/30/1987 | CN87104300A Production of high purity zirconia from zirconiferous materials |
| 12/17/1987 | WO1987007650A1 Target made of highly pure metallic tantalum and process for its production |
| 12/09/1987 | EP0248397A2 Prebaked zirconium for electron beam melted barrier tube shell material |
| 12/09/1987 | EP0248396A2 Combined electron beam and vacuum arc melting for barrier tube shell material |
| 12/09/1987 | EP0248338A1 Highly pure titanium and process for producing the same |
| 12/08/1987 | US4711664 Process for producing zirconium sponge with a very low iron content |
| 11/11/1987 | CN86106257A Plasma carbothermic method for producing molybdenum iron |
| 11/10/1987 | US4705671 Apparatus for reducing iron and vanadium in phosphoric acid solution |
| 11/10/1987 | CA1228988A1 Reducing the oxygen content of tantalum |
| 11/04/1987 | EP0243725A2 Method for purifying titanium oxide ores |
| 10/20/1987 | US4701309 Dilute and concentrated sulfuric acid applications; recycling |
| 10/20/1987 | US4701308 Oxidation, then extraction with hydroxamic acid |
| 10/14/1987 | EP0241278A2 Method of separating and purifying tantalum and niobium-containing compounds |
| 10/14/1987 | EP0241149A2 Value recovery from spent alumina-base catalysts |
| 09/30/1987 | EP0239227A1 Fluidised bed process for the recovery of finely divided metals |
| 09/16/1987 | EP0236480A1 Production of hydrogen by deserpentinization of ultramafic rock. |
| 09/09/1987 | EP0236221A1 Process for lithiothermically producting metallic powders |
| 09/02/1987 | EP0234807A2 Selective chlorination of iron values in titaniferous ores |
| 09/01/1987 | CA1226135A1 Apparatus for preparing high-melting-point high- toughness metals |
| 08/27/1987 | WO1987005052A1 Fluidised bed process for the recovery of finely divided metals |
| 08/19/1987 | EP0232615A2 Liquid phase adsorption and oxidation of ferric chloride using a eutectic salt complex |
| 08/18/1987 | US4687647 Conversion of molybdenite to molybdenum dioxide using petroleum or coal tar pitches |
| 08/18/1987 | US4687632 Using a metal reducing agent |
| 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 |
| 08/12/1987 | CN86108218A One time vanadium dregs roasting in rotary furnace and extraction of vanadium by the aquo-soaking |
| 08/04/1987 | US4684401 From chlorides; two-step reduction |
| 08/04/1987 | US4684399 Tantalum powder process |
| 08/04/1987 | CA1224926A1 Method for working-up complex sulphidic ore concentrates |
| 07/21/1987 | US4681627 Process for preparing an ingot from metal scrap |
| 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 |
| 07/09/1987 | DE3600038A1 Process for preparing vanadium oxides low in alkali |
| 07/07/1987 | US4678506 Production of titanium articles that are free from low density inclusions |
| 07/06/1987 | EP0124578A4 Chlorination of titanium ores using lignitic reactive carbons. |
| 06/16/1987 | US4673554 Method of purifying tantalum |
| 06/16/1987 | EP0225674A2 Vanadium recovery process |
| 06/10/1987 | CN86107703A Method for melting and reducing chrome ore |
| 06/10/1987 | CN86106147A Production of elements and compounds by deserpentinization of ultramafic rock |
| 06/09/1987 | CA1222635A1 Entrained downflow chlorination of fine titaniferous material |
| 06/02/1987 | US4670229 Slurrying, oxygen pressurization leaching |
| 06/02/1987 | US4670051 Oxidation process for releasing metal values in which nitric acid is regenerated in situ |
| 06/02/1987 | US4669667 Nozzle for spraying a liquid into a vessel opening |
| 05/27/1987 | CN85108533A Processing for extracting molybdenum from tungsten by solvent |
| 05/26/1987 | US4668483 Process for recovery of chromium |
| 05/26/1987 | US4668287 From tetrachlorides, magnesium, magnesium, chloride, linings, drains, sealing, melts |
| 05/26/1987 | US4668286 Process for making zero valent titanium from an alkali metal fluotitanate |
| 05/26/1987 | US4668124 Disposal of material containing vanadium as landfill |
| 05/20/1987 | EP0222397A2 Method for melting and reducing chrome ore |
| 05/19/1987 | US4666685 Hydrodesulfurization catalyst |
| 05/19/1987 | US4666512 Method for recovering vanadium from vanadium-containing ore |
| 05/13/1987 | EP0221760A2 Method for recovering metal values from mixed-metal aqueous solutions by selective phosphate precipitation |
| 05/12/1987 | CA1221548A1 Process for recovering metal values from alloy scraps |
| 05/06/1987 | EP0220583A2 Method of recycling sulfuric acid form diluted acid |
| 05/06/1987 | EP0220198A1 Preparing metal compounds by pyrolysis. |
| 05/05/1987 | US4663131 Process for the preparation of titanium dioxide |
| 05/05/1987 | US4663130 Process for dissolving tantalum/columbium materials containing alkali metal impurities |
| 05/05/1987 | US4662936 Method of treating nickel-containing and vanadium-containing residues |
| 05/05/1987 | CA1221475A1 High-purity molybdenum target and high-purity molybdenum silicide target for lsi electrodes and process for producing the same |
| 05/05/1987 | CA1221244A1 Recovering metals from spent hydroprocessing catalysts |
| 05/05/1987 | CA1221243A1 Vanadium recovery from ash from oil sands |
| 04/28/1987 | US4661240 Low sulfur coke using dispersed calcium |
| 04/21/1987 | US4659376 Fluid bed reduction to produce molybdenum metal |
| 04/21/1987 | CA1220698A1 Microstructural refinement of cast metal |
| 04/21/1987 | CA1220628A1 Process for recovering molybdenum and copper from sulfide concentrates |
| 04/16/1987 | DE3536495A1 Process for the extraction of vanadium from vanadium-containing raw materials |
| 04/14/1987 | US4657745 Value recovery from spent alumina-base catalyst |
| 04/14/1987 | CA1220325A1 Process and apparatus for obtaining silicon from fluosilicic acid |
| 04/08/1987 | EP0217237A2 Chlorination of iron-containing metaliferous materials |
| 04/07/1987 | US4655827 Process for the reduction of fluorides of silicon, titanium, zirconium or uranium |
| 04/01/1987 | EP0216398A1 Process for preparing refined tantalum or niobium |
| 03/26/1987 | WO1987001731A1 Production of elements and compounds by deserpentinization of ultramafic rock |
| 03/24/1987 | US4652434 Chlorination of ores containing alkali or alkaline earth values |