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WO/1995/025824A1 |
A method and apparatus for continuously producing metals such as zirconium, hafnium, titanium, niobium, vanadium, silicon and tantalum. The corresponding metal halide is reacted with a metallic reducing agent such as aluminum, calcium, m...
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WO/1995/024510A1 |
A process for facilitating removal of one or more impurities from titaniferous material containing the impurities in a form which is highly soluble in acid. The material is in turn leached with a sulphuric acid solution and with a hydroc...
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WO/1995/023238A1 |
In this document there is disclosed a method for purifying slag. The steps for such purification involve introducing molten slag into a heat vacuum chamber (10), whereby the heat and vacuum oxidize the slag. Further the slag is skimmed o...
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WO/1995/016635A1 |
A process is disclosed for converting a spent catalyst from conventional fluorination processes into a commercially useful tantalum or niobium oxide such as Ta(OH)5, Ta205, Nb(OH)5, or Nb205. The process broadly relates to dissolving the...
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WO/1995/016636A1 |
A process is disclosed for converting a spent catalyst from conventional fluorination processes into a commercially useful tantalum or niobium salt such as K2TaF7 or K2NbF7. The process broadly relates to dissolving the spent catalyst in...
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WO/1995/013985A1 |
The process for recovering Ta/Nb values from highly fluorinated ore materials by the process of: (a) contacting the materials with one or a mixture of HNO3 or HC1, and H3BO3 wherein the H3BO3 to other acid molar ratio is from about 1/10 ...
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WO/1995/008652A1 |
A method and apparatus of introducing one or more reagents into a rotary and/or elongate kiln in which titaniferous material is being treated e.g. upgraded wherein the reagent(s) is introduced (I) at a plurality of locations along the le...
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WO/1995/008004A1 |
High energy ball milling of particulate ilmenite (or other titaniferous ore) at room temperature, for periods of up to 300 hours, in the presence of a suitable additive, produces a nanostructural powder from which at least a major propor...
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WO/1995/007366A1 |
A process for upgrading a titaniferous material by removal of impurities from the titaniferous material is disclosed. The process comprises alternate leaching of the titaniferous material in a caustic leach and a pressure sulphuric acid ...
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WO/1995/004836A1 |
A method for forming a wrought product from a starting metal (5) such as tantalum, niobium, and alloys thereof. A consumable electrode is coated with at least a first alloy layer (40) by means which provide for uniform thickness. Suffici...
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WO/1995/003887A1 |
A process is disclosed for recovering components of a catalyst (4, 6, 8), in particular a spent DeNox catalyst. The catalyst (4,6, 8) is ground and the ground catalyst is then shaped into bodies (18) having a defined grain. Alternatively...
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WO/1995/003994A1 |
For the purpose of efficiently and easily regenerating a sulfuric acid solution having a high concentration and a low impurity content from a metal sulfate-containing waste sulfuric acid solution and waste liquor formed during acid clean...
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WO/1995/001461A1 |
The invention relates to a method for extracting metals from spent catalysts on the basis of Al2O3, which method involves calcining the catalyst - if contaminated with carbon and hydrocarbons and the like - in an oxidizing environment, h...
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WO/1994/026944A1 |
A process for removing impurities from a titaniferous material that has been subjected to thermal reduction is disclosed. The process comprises the steps of: (i) subjecting the thermally reduced titaniferous material to a secondary heat ...
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WO/1994/012675A1 |
A process for beneficiation of titaniferous ores is disclosed in which a titanium and iron-containing ore, such as ilmenite, is heated with potassium hydroxide, e.g. at temperatures of about 350-650 �C and then the product is treated w...
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WO/1994/008059A1 |
A clean refractory metal SWARF particle product is made from refractory metal SWARF. The SWARF particles are produced with coolant at a temperature of less than 650 �C to prevent formation of refractroy metal oxides and nitrides. The S...
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WO/1994/005600A1 |
A process for the production of a substantially pure salt of fluorotitanic acid from an impure titanium source comprising dissolving the titanium source in hydrofluoric acid, treating the thus formed solution with an ammonium or alkali m...
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WO/1994/004709A1 |
The application discloses a process for upgrading a titaniferous material by removal of impurities contained in the material especially radionuclides. The process involves heating the titaniferous material to a temperature of less than 1...
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WO/1994/003647A1 |
A process for facilitating the removal of impurities e.g. radionuclides, such as uranium and thorium, and/or one or more of their radionuclide daughters, from titaniferous material includes contacting the titaniferous material with one o...
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WO/1994/001190A1 |
A process for recovering metal (17) and acid values (48) from a source material (22) containing metallic fluorides comprises digesting (10) the source material in sulfuric acid (20) to form a slurry, separating (12) a fluoride containing...
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WO/1993/024669A2 |
In a continuous process for reacting particulate ore with a liquid reagent in a counter-current vertical column, wherein liquid reagent is introduced at the bottom of the column, particulate ore is introduced at the top of the column, re...
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WO/1993/024668A1 |
Hot metal is circulated by R-H unit (28) in a closed loop path through first and second hearths (10 and 11) and chambers (12, 14, 16 and 18). Titaniferous material containing iron oxide is introduced into first hearth (10) and the iron o...
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WO/1993/023580A1 |
Process for beneficiating particulate titanium-bearing material containing iron oxides comprising: (a) contacting in a mechanical reduction kiln, particulate titanium-bearing material, particulate carbonaceous reducing material, and HCl ...
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WO/1993/022465A1 |
Process for beneficiating anatase titanium dioxide ore comprising: (a) contacting the ore with an aqueous solution of a mineral acid having a concentration of about 3-30 percent by weight, said contacting taking place at a temperature of...
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WO/1993/018193A1 |
The acid washing of leached solids obtained from the beneficiation of titaniferous ores. In particular, the invention forms a part of a process for the beneficiation of titaniferous ores to produce a product high in titanium dioxide, and...
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WO/1993/018192A1 |
The continuous leaching of treated titaniferous ores with alcohol solutions. In particular, the invention forms a part of a process for the benefication of titaniferous ores to produce a product high in titanium dioxide, and low in other...
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WO/1993/017970A1 |
Chromium containing protein materials are treated by processes which include the steps of: combining the material to be treated with sufficient water to effect the solubilization of the gelable protein recovered therefrom, and an alkali ...
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WO/1993/018191A1 |
The continuous leaching of treated titaniferous ores with inter-stage evaporation. In particular, the invention forms a part of a process for the beneficiation of titaniferous ores to produce a product high in titanium dioxide, and low i...
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WO/1993/014232A1 |
The present invention concerns a new process and the relative plant for reducing hexavalent chromium contained in the resultant earth after the production of chromium, in order to obtain the transformation from water-soluble compounds in...
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WO/1993/012902A1 |
A method of skull-melting comprising the steps of providing a vessel (50) for skull-melting with an interior (56) and an underside, and an orifice (52) connecting the interior (56) to and underside. Disposing a waveguide (54) in the orif...
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WO/1993/004206A1 |
A process for producing a titanium product, which process includes: providing a titanium-containing material; and a leaching composition including: a source of ammonia or ammonium ions; a source of carbon dioxide or carbonate ions; and w...
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WO/1993/004207A1 |
A process for producing a zirconium product, which process includes: providing a zirconium-containing material; and a leaching composition including: a source of ammonia or ammonium ions; a source of carbon dioxide (CO¿2?) or carbonate ...
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WO/1993/000451A1 |
A process for the recovery of niobium, tantalum, and vanadium metals from ferrometal alloys containing those metals by serially reacting the ferroalloy with hydrogen then nitrogen, separating the nitrides formed and denitriding the metal...
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WO/1992/022779A1 |
The invention provides an improved method and apparatus for feeding solids to a fluidized bed reactor (7). A back pressure control valve (5) regulates the pressure drop between the pressure above a solids column in a standpipe (4) and th...
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WO/1992/020827A1 |
Process for beneficiating titanium bearing ore selected from the group consisting essentially of titaniferous ores, leucoxene, rutile, perovskite, and sphene comprising: (a) contacting said ore with an aqueous solution of a mineral acid ...
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WO/1992/014851A1 |
The invention relates to a process for the production of metallic titanium, characterized in that the process comprises reducing a titanium-fluorine compound selected from titanium tetrafluoride and any hexafluorotitanate soluble in a mo...
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WO/1992/008816A1 |
Process of producing titanium dioxide of pigment quality, by chemically processing previously enriched and purified anatase ore, herein denominated Upgraded Anatase Concentrate, through digestion with sulphuric acid, maintenance of the r...
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WO/1992/004121A1 |
A process for enhancing ilmenite from deposits of mineral sands or mineral concentrates comprises a single stage fluidised bed magnetising roast (16). A temperature of 650 °C - 900 °C in an excess of a carbonaceous fuel (such as coal/c...
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WO/1992/003581A1 |
A process for enhancing fluidization in a fluidized bed reactor chamber (18). In a preferred embodiment, molybdenum oxide (12) is reduced to molybdenum metal in the fluidized bed (30). An oxidant (52) is introduced into the fluidized bed...
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WO/1992/001818A1 |
In the particular embodiments described in the specification, a vacuum furnace includes a conveying arrangement for holding four solid metal members (16, 22) with their end faces (18) in closely-spaced relation and an energy beam gun (11...
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WO/1991/018121A1 |
A process for producing a high purity tantalum powder wherein a small quantity of an active ingredient, having a higher thermodynamic potential and chemical activity than the metal surfaces of the reactor vessel, is added to the reactor ...
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WO/1991/017956A1 |
The specification discloses a method of making acid digestible titania. The method comprises the steps of: (1) adding a magnesium or manganese compound to a titaniferous mineral if the content of manganese and magnesium in the mineral is...
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WO/1991/017118A1 |
The present invention relates to the production of alkaline chromates from chromium minerals. The ground minerals are mixed finely with alkali. Then the mixture is continuously fed into a rotating reactor (1) positioned in a heating cham...
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WO/1991/014793A1 |
Process for removing inorganic gels and dispersed, particulate incompressible solids from an aqueous slurry having a pH of about -2 to +3 and a soluble metallic chloride content of about 3 to 50 percent by weight, based on the total weig...
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WO/1991/013179A1 |
A process for recovering heavy metals from spent catalysts on an alumina support material comprising calcining the catalyst feed material to remove impurities and smelting the calcined feed in an electric arc furnace, preferably with scr...
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WO/1991/013182A1 |
A process for the deoxidation of a refractory metal containing minor concentrations of oxygen is disclosed. In this process the refractory metal is contacted with a metallic deoxidant in a dry, inert atmosphere. The metallic deoxidant an...
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WO/1991/013180A1 |
The specification describes a process for producing synthetic rutile from a titaniferous ore or concentrate. The process involves three basic steps which are reduction, removal or iron by leaching or aeration and removal of other impurit...
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WO/1991/012080A1 |
A process for the recovery of zircon from a particulate zircon-containing material. The process involves contacting the zircon-containing material with a soap solution followed by at least one water wash and at least one acid wash. The a...
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WO/1991/005881A2 |
A method is provided for removing chromium from a chromium containing waste material wherein the waste material is dried by indirect heating, sized to a particle size of less than 0.105 mm, mixed with alkaline and oxidizing reactants, an...
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WO/1990/015162A1 |
The specification discloses a process for pre-heating and pre-reducing metal oxide ores. The process comprises introducing particles of an oxide ore entrained in a gas through a port into a treatment chamber. Inside the treatment chamber...
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