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| Number | Title | Issue Date |
| 7326390 | Production of titania A sulfate process for producing titania from titaniferous material is disclosed. The process includes precipitating titanyl sulfate from leach liquors containing acidic solutions of titanyl sulfate. The process is characterised by: (a) multiple stage leaching to pro... | 02/05/2008 |
| 7145046 | Production of fluorine compounds Inorganic and organic compounds containing fluorine can be produced, for example, from corresponding chlorine-containing compounds by chlorine/fluorine exchange using fluorinating agents. Monocyclic or bicyclic compounds containing at least two nitrogen atoms, at le... | 12/05/2006 |
| 7138357 | Photocatalyst containing titanium oxide, the production method and use of the same The invention relates to a photocatalyst containing titanium dioxide, to a method for using it and to its application. A sulphurous titanium dioxide hydrate precipitate is precipitated from an acid titanium oxysulphate solution at a temperature below the boiling poi... | 11/21/2006 |
| 7086405 | Screenings washer A screenings washer having a hopper, a grinder downstream of the hopper, and a washer downstream of the grinder. The washer includes an auger rotor that receives the screenings ground by the grinder, a spray wash system that sprays a wash fluid directly onto a porti... | 08/08/2006 |
| 7008602 | Beneficiation of titaniferous ore with sulfuric acid Processes for the efficient and economical beneficiation of titaniferous ore are provided. A unique process for beneficiating ore comprising pretreatment of the ore by oxidation and reduction, followed by acid leaching with sulfuric acid has been developed. The acid... | 03/07/2006 |
| 6692719 | Process for regeneration of acid halide solutions A process is disclosed for regenerating an aqueous acid halide leachant from a spent aqueous metal halide leach liquor. The process comprises introducing into a fluidized bed or spray roaster a hydrocarbon fuel, an oxygen-enriched oxidizing gas and the aq... | 02/17/2004 |
| 6468483 | Process for treating alumina-bearing ores to recover metal values therefrom A method for processing alumina-bearing ores such as bauxite to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the alumina-bearing ores to a digester containing an acid to provide a mixture of... | 10/22/2002 |
| 6447738 | Coproducing alumina, iron oxide, and titanium-dioxide from aluminum ore bodies and feedstocks A process for the extraction of alumina, iron oxide and titanium dioxide from bauxite ore and clays, and other ore bodies and feedstocks. The process starts by sulfuric acid leaching of the feedstocks in pressure autoclaves at about 200° C. and appropria... | 09/10/2002 |
| 6248302 | Process for treating red mud to recover metal values therefrom A method for processing red mud to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the red mud to a digester containing an acid to provide a mixture of acid and red mud and heating the mixture ... | 06/19/2001 |
| 5997606 | Production of titanium slag A process for producing titanium slag which is low in radioactivity wherein molten titanium slag, produced by smelting ilmenite in the presence of a reductant in a DC electric arc furnace, is separated from molten iron, boron in an amount which is less th... | 12/07/1999 |
| 5846510 | Regeneration of hydrochloric acid A process for forming an aqueous chloride leachant from a spent aqueous chloride leach liquor which process comprises passing a spent aqueous chloride leach liquor and gases containing hydrogen chloride through a preconcentrator to form a concentrated aqu... | 12/08/1998 |
| 5730774 | Process for upgrading titaniferous materials A process for removing impurities from a titaniferous material that has been subjected to thermal reduction and which includes a titaniferous phase of general formula M3 O5. The thermally reduced titaniferous material is subjected to... | 03/24/1998 |
| 5660805 | Method for beneficiating titanium-bearing material containing iron A process for beneficiating particulate titanium-bearing ore containing iron oxides is disclosed. The first step of the process entails prereducing the ore to convert about 20-90 percent of the iron oxides in the ore to metallic iron. Next, the prereduced... | 08/26/1997 |
| 5527469 | Method for the preparation of desulfurized titanium oxide hydrolysate of high purity A titanium oxide hydrolysate slurry prepared by the sulfate process is treated with either an alkali metal hydroxide or an alkali metal carbonate to solubilize the sulfur bound to the titanium at a temperature of from 60° C. to 120° C. and the slurry is... | 06/18/1996 |
| 5489423 | Process for recovering sulfuric acid from metallic sulfate-containing exhaust sulfuric acid In order to efficiently and easily recover a spent sulfuric acid exhasuted, for example, in an acid washing liquid or in producing titanium dioxide by a sulfate method in a large amount, as highly concentrated sulfuric acid, bivalent iron ions in the spen... | 02/06/1996 |
| 5427749 | Production of synthetic rutile 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 impurities by leaching in... | 06/27/1995 |
| 5411719 | Production of acid soluble titania Accordingly the present invention provides a process for producing acid soluble titania which process comprises the steps of: (i) adding a manganese or magnesium compound to a titaniferous mineral if the mineral does not contain sufficient manganese and magnes... | 05/02/1995 |
| 5409679 | Process for the production of titanium dioxide The production of titanium dioxide by the sulphate process generates waste substances such as the wash filtrates, which are formed in the washing of titanium dioxide hydrate, and waste gases which contain sulphur dioxide. In this improved process the wash... | 04/25/1995 |
| 5389355 | Method of preparing a synthetic rutile from a titaniferous slag containing alkaline earth metals Synthetic rutile is prepared from titaniferous slags containing alkaline-earth metal impurities, such as magnesium oxide, by a method comprising contacting the slag with chlorine at a temperature of at least about 800° C., and then leaching the chlorine-... | 02/14/1995 |
| 5271910 | Process of treating metal chloride wastes A process of treating metal chloride wastes produced by chlorination of titanium ore comprises the steps of: (a) leaching said metal chloride wastes in a hydrochloric acid (HCl)-containing solution to obtain a solution containing solids and dissolved meta... | 12/21/1993 |
| 5248497 | Production of purified iron chloride by a vacuum process in the manufacture of titanium dioxide This invention provides a process for the recovery of purified ferrous chloride resulting as a by-product during the production of titanium dioxide by the chloride process. The process involves a two-step cooling of a filtered solution containing ferrous ... | 09/28/1993 |
| 5186920 | Recovering TiO2 concentrates from TiO2 -containing substances The iron content of the TiO2 -containing precursor is subjected to a direct reduction to effect a metallization of at least 90%. The reduced product is separated into magnetic and nonmagnetic fractions by magnetic separation. To oxidize the met... | 02/16/1993 |
| 5063032 | Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values Synthetic rutile is prepared from titaniferous slags containing alkaline-earth metal impurities, such as magnesium oxide, by a method comprising contacting the slag with chlorine at a temperature of at least about 800° C., and then leaching the chlorine-... | 11/05/1991 |
| 4988495 | Process for the recorvery of sulphuric acid in the production of titanium dioxide A process for the preparation of an improved quality TiO2 pigment by hydrolysis of titanyl sulphate, isolation of the hydrolysis product form the waste acid produced during the hydrolysis, washing of the hydrolysis product and calcination of th... | 01/29/1991 |
| 4952387 | Process for separating metal sulphates from sulphuric acid A process for the separation of metal sulphates from dilute sulphuric acid by evaporative concentration of the sulphuric acid to a concentration of from 55 to 75% by weight H2 SO4, cooling of the resulting solution or suspension and ... | 08/28/1990 |
| 4933153 | Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values A synthetic rutile is prepared from a titaniferous slag, typically containing at least about 1.0 weight percent magnesium oxide and at least some portion of its titanium values as Ti2 O3, by a method comprising contacting the slag wi... | 06/12/1990 |
| 4917872 | Method for producing titanium fluoride A method for producing titanium fluoride comprises: a dissolution process, wherein iron-containing titanium material is dissolved in solutions containing hydrofluoric acid, fluoride solutions being produced; a first crystallization and separation process,... | 04/17/1990 |
| 4891206 | Process for the removal of undesirable metal ions, especially vanadium ions, in the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions A process for the extensive removal of undesirable metal ions, particularly vanadium ions, in the course of the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions. The sulfuric acid solutions are concentrated by the evaporation of... | 01/02/1990 |
| 4416693 | Recovery of titanium metal values Titanium metal values may be recovered from a metal-bearing source containing titanium and iron by subjecting the source to an oxidation treatment and a reductive roast. After having crushed the source to a desired particle size, the reduced source is the... | 11/22/1983 |
| 4390365 | Process for making titanium metal from titanium ore The instant invention relates to a process for the preparation of titanium metal from an ore comprising titanium oxides which process comprises the steps of fluorinating the ore to convert the titanium oxides to titanium fluorides and then reducing the ti... | 06/28/1983 |
| 4384883 | Reduction of ferrotitaniferous materials A reduction process for the metallization of ferrotitaniferous materials comprising a partial metallization at a low temperature with hydrogen followed by a high temperature reduction with a carbonaceous reductant.... | 05/24/1983 |
| 4304758 | Hydrolyzable titanyl sulphate solutions by decomposition of ternary raw material mixtures A process for the preparation of a hydrolyzable titanyl sulphate solution comprising adding sulphuric acid having a concentration greater than about 86% to a ternary mixture of two slags and an ilmenite to bring the proportion by weight of H2 S... | 12/08/1981 |
| 4288418 | Process for manufacturing titanium dioxide A process is provided for the manufacture of titanium dioxide pigment wherein excess ilmenite ore is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight and in preferably at least two stages wherein the fi... | 09/08/1981 |
| 4288417 | Process for manufacturing titanium dioxide A process is provided for the manufacture of titanium dioxide pigment wherein excess ilmenite ore is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight in the presence of an iron reductant, and in prefera... | 09/08/1981 |
| 4288415 | Process for manufacturing titanium compounds using a reducing agent A process is provided for the manufacture of titanium compounds and particularly titanium dioxide wherein excess titaniferous bearing material is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight at a te... | 09/08/1981 |
| 4288416 | Process for manufacturing titanium compounds A process is provided for the manufacture of titanium compounds and particularly titanium dioxide wherein excess titaniferous bearing material is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight at a te... | 09/08/1981 |
| 4275041 | Process for manufacturing a stable titanyl sulfate solution A process is provided for the manufacture of a stable titanyl sulfate solution by diluting a reaction mixture containing iron sulfate and titanyl sulfate with a material selected from water, a titanyl sulfate solution, and mixtures thereof. The titanyl su... | 06/23/1981 |
| 4202863 | Separation of iron metal values from titanium metal values In a process for recovering titanium metal values from a titanium bearing source which also contains iron, the source is subjected to a reductive roast followed by a leach of the reduced source with hydrogen chloride. The suppression of the dissolution of... | 05/13/1980 |
| 4199552 | Process for the production of synthetic rutile An improved process for the production of synthetic rutile from ore containing titanium and iron, such as ilmenite ore, by a multi-step procedure employing controlled reduction, controlled oxidation and acid leaching. More specifically, the ilmenite ore f... | 04/22/1980 |
| 4183899 | Chlorination of ilmenite and the like Ferruginous titaniferous material is chlorinated with chlorine for producing a product stream of titanium chlorides and by-product metallic iron in a laminar flow process.... | 01/15/1980 |
