| Patents for C22B 34 - Obtaining refractory metals (6,435) |
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| 02/09/1993 | US5185031 Device and method for skull-melting depth measurement |
| 01/26/1993 | US5181956 Removing naturally occurring radionucleotides, leaching with a mineral acid |
| 01/20/1993 | CN1068147A Method for purifying tio2 ore |
| 01/07/1993 | WO1993000451A1 Recovery of niobium metal |
| 01/07/1993 | DE4121919A1 Scrap tantalum@ wire purificn., used for superalloys - by heating scrap contaminated with oxide(s) with getter metal e.g. calcium@ and/or magnesium@ |
| 01/05/1993 | US5176878 Zirconium-hafnium separation process |
| 01/05/1993 | US5176741 Producing titanium particulates from in situ titanium-zinc intermetallic |
| 01/05/1993 | US5175943 Solids feed system and method for feeding fluidized beds |
| 12/23/1992 | WO1992022779A1 Solids feed system and method for feeding fluidized beds |
| 12/23/1992 | CA2110512A1 Solids feed system and method for feeding fluidized beds |
| 12/22/1992 | US5173108 Method for controlling the oxygen content in agglomerated molybdenum powders |
| 12/16/1992 | EP0517786A1 Production of synthetic rutile |
| 12/16/1992 | EP0289537B1 Process for the production of zirconium sulphate |
| 12/15/1992 | US5171549 Process for decreasing the level of impurities in zirconium chloride, titanium chloride and hafnium chloride |
| 12/15/1992 | US5171548 Absorbing pentavalent vanadium complex on anion exchange resin; reducing to strip from resin; redox system; precipitating phospovanadic acid |
| 12/15/1992 | US5171547 Recovery of chromium in high purity state from waste materials of etching operations |
| 12/09/1992 | EP0516763A1 Deoxidation of a refractory metal |
| 12/02/1992 | EP0475953A4 Production of acid soluble titania |
| 11/26/1992 | WO1992020827A1 METHOD FOR PURIFYING TiO2 ORE |
| 11/26/1992 | CA2103056A1 Method for purifying tio2 ore |
| 11/25/1992 | EP0515116A2 Molybdenum recovery |
| 11/17/1992 | US5164097 Nozzle assembly design for a continuous alloy production process and method for making said nozzle |
| 11/03/1992 | US5160482 Zirconium-hafnium separation and purification process |
| 10/29/1992 | DE4209892A1 Verfahren zum entfernen von vanadium aus einem waessrigen strom und verwendung des verfahrens bei der herstellung von natriumbichromat A method of removing vanadium from an aqueous stream and using the method during the production of sodium bichromate |
| 10/28/1992 | CN1018847B Niobite fe alloy preparing from niobite fe ore |
| 10/27/1992 | US5158688 Process for removing inorganic gels and incompressible solids from acidic media |
| 10/27/1992 | US5158602 Method and apparatus for separating copper from chromite |
| 10/21/1992 | EP0509447A2 Thermite process for producing a metal or alloy |
| 10/21/1992 | EP0272294B1 Preparation of hydrolysed zirconium salt precursors and high purity zirconia |
| 10/21/1992 | EP0270637B1 Manufacture of high purity zirconia from low-silica zirconiferous materials |
| 10/21/1992 | CN1018736B Production of high-voltage high specific capacitance tantalum powder by means of carbon reduction |
| 10/14/1992 | EP0508697A1 A re-calcination and extraction process for the detoxification and comprehensive utilization of chromic residues |
| 10/06/1992 | US5152830 Loading mixture of metal oxide powders and reducing agent in layers having controlled concentrations so as to control amounts of heat generated in exothermic reaction, efficiency |
| 09/15/1992 | US5147619 Feeding a sludge containing fine particles of nickel catlayst and fat into a fluidized bed, combustion or degradation of fat to produce waste gases and separating catalysts particles from fluidized bed and waste gases |
| 09/03/1992 | WO1992014851A1 Process for the production of metallic titanium and intermediates useful in the processing of ilmenite and related minerals |
| 09/02/1992 | EP0501153A1 Nozzle assembly design for a continuous alloy production process and method for making said nozzle |
| 08/25/1992 | CA1306612C Process for treatment of flyash |
| 08/19/1992 | CN1063665A Titanium dioxide production from upgraded anatase ore concentrates using fluid sulphuric acid sulphation |
| 07/29/1992 | EP0236480B1 Production of hydrogen by deserpentinization of ultramafic rock |
| 07/28/1992 | US5133947 Reduction, precipitation |
| 07/28/1992 | US5133865 Process for producing a hafnium extraction scrub solvent |
| 07/21/1992 | US5132016 Solvent prestripping in a zr/hf separation liquid-liquid extraction (llx) circuit |
| 07/21/1992 | US5131634 Sublimer-reactor system with weighing means |
| 07/14/1992 | CA1304943C Metal production process by reduction of metallic salts |
| 07/08/1992 | EP0493591A1 Vacuum processing of reactive metal |
| 07/01/1992 | CN1017286B Bidifectional control signalling bus interface apparatus for transmitting signals between two bus system |
| 06/30/1992 | US5125965 Method for maintaining fluidization in a fluidized bed reactor |
| 06/30/1992 | US5125964 Fluidized bed process for preparing tungsten powder |
| 06/17/1992 | EP0490128A2 Zirconium-hafnium production in a zero liquid discharge process |
| 06/16/1992 | CA1303329C Process for preparing pigmentary titanium dioxide |
| 06/10/1992 | CN1016971B Method and apparatus for carrying out thermochemical process |
| 06/03/1992 | EP0449892A4 Extraction and purification of titanium products from titanium bearing minerals |
| 06/03/1992 | CN1061579A Preliminary concentration method and device for associated thin acid in processing titania with sulphate process |
| 06/02/1992 | CA1302047C Method for producing titanium fluoride |
| 05/29/1992 | WO1992008816A1 Titanium dioxide production from upgraded anatase ore concentrates using fluid sulphuric acid sulphation |
| 05/27/1992 | EP0487379A2 Method of anti-pollution treatment of a used refining catalyst and complete recuperation of the different metal constituents of this catalyst |
| 05/27/1992 | EP0487368A2 Antipolluting treatment of a used refining catalyst and recuperation of metals |
| 05/19/1992 | CA1300893C Fluidised bed process |
| 05/13/1992 | EP0288556B1 Rhenium generator system and method for its preparation and use |
| 05/13/1992 | CA2055280A1 Process for antipollution treatment of a spent refining catalyst and total recovery of different metal constituents of said catalyst |
| 05/12/1992 | US5112493 Zirconium-hafnium production in a zero liquid discharge process |
| 05/05/1992 | US5110566 Cationic exchange resin with pentavalent phosphorus derived active groups |
| 05/01/1992 | CA2054510A1 Process for antipollution treatment of a spent refining catalyst and recovery of metals |
| 04/29/1992 | EP0482808A1 Method for producing high-purity metallic chromium |
| 04/28/1992 | US5108490 Reacting crude titanium with titanium tetraiodide to form lowervalent iodides which are thermally decomposed to form pure titanium and titanium tetraiodide |
| 04/22/1992 | CN1060500A Improved process for separating ilmenite |
| 04/01/1992 | EP0477450A1 Method for recovery of tungsten from spent catalysts |
| 04/01/1992 | CN1059856A Fluidized bed process for preparing tungsten powder |
| 03/31/1992 | US5101052 Molybdenum recovery |
| 03/31/1992 | US5100465 Kroll reduction process |
| 03/25/1992 | EP0476172A1 Process for preconcentrating diluted acid obtained during titanium dioxide preparation according to the sulphate process and use of apparatus for this process |
| 03/25/1992 | EP0475953A1 Production of acid soluble titania. |
| 03/24/1992 | US5098471 Separation of magnesium from magnesium chloride and zirconium and/or hafnium subchlorides in the production of zirconium and/or hafnium sponge metal |
| 03/24/1992 | CA1297680C Method for recovering vanadium from residues from the combustion of petroleum fractions |
| 03/21/1992 | CA2050710A1 Preconcentration of sp spent acid with non-purified calcination waste gases in a venturi scrubber |
| 03/18/1992 | EP0475104A1 Process for working up digestion residues of titanium dioxide production |
| 03/18/1992 | EP0474704A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 03/03/1992 | US5092921 Method for producing high-purity metallic chromium |
| 03/03/1992 | US5092564 Column for treating particulate materials with a gas |
| 03/03/1992 | CA1296531C Chlorination of ores containing alkali or alkaline earth values |
| 03/01/1992 | WO1992004121A1 Process for separating ilmenite |
| 02/26/1992 | EP0471816A1 Process for recovering heavy metals from spent catalysts |
| 02/23/1992 | WO1992003581A1 Method for maintaining fluidization in a fluidized bed reactor |
| 02/23/1992 | CA2090119A1 Method for maintaining fluidization in a fluidized bed reactor |
| 02/06/1992 | WO1992001818A1 Vacuum processing of reactive metal |
| 01/30/1992 | DE4124547A1 Selective extn. of titanium as tetra:chloride |
| 01/28/1992 | US5084253 Method of removing niobium from uranium-niobium alloy |
| 01/28/1992 | US5084090 Vacuum processing of reactive metal |
| 01/28/1992 | US5084080 Device for trapping gaseous compounds of refractory metals and pumping plant including same |
| 01/20/1992 | CA2044529A1 Vacuum processing of reactive metal |
| 01/15/1992 | EP0426731A4 Sintered high titanium agglomerates |
| 01/08/1992 | CN1057678A Process for producing high-quality niobium-iron alloy from concentrated niobite |
| 01/07/1992 | US5078789 Removal of magnesium and magnesium chloride from a sponge refractory metal such as zirconium |
| 12/25/1991 | CN1057244A Process and plant for prepn. of alkaline chromates from chromium minerals |
| 12/24/1991 | CA1293380C Vanadium recovery process |
| 12/24/1991 | CA1293356C Process for the production of titanium dioxide |
| 12/18/1991 | CN1015113B Method for production of metal or ferroalloys by direct reduction and pre-reduction column thereby |
| 12/17/1991 | US5073355 Scrubbing with ferrous chloride |
| 12/11/1991 | EP0460319A1 Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values |
| 12/11/1991 | EP0460318A1 Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values |