Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7604786 | Method for recovering indium from indium-containing material The present invention provides a recovery method in which the indium sponge that is deposited by substitution in the substitution deposition step in the recovery of indium from an indium-containing material is produced in the form of a powder rather than in a bulky ... | 10/20/2009 |
| 7090809 | Production of aluminum compounds and silica from ores A method for the production of inorganic aluminum substances and amorphous silica from aluminum oxide containing ores, comprising: (a) leaching of said ores with fluorosilicic acid to obtain aluminum fluosilicate solution; (b) filtering said leached solution from in... | 08/15/2006 |
| 6903040 | Continuous process and apparatus for the efficient conversion of inorganic solid particles The invention pertains to a continuous process for the conversion of inorganic solid starting particles which either are amorphous or possess a degree of order into inorganic solid product particles which (a) when the starting particles are amorphous, p... | 06/07/2005 |
| 6187275 | Recovery of AlF3 from spent potliner A method of recovering AlF3 from spent potliner using an acid digest to form gaseous HF which is converted to hydrofluoric acid and reacted with alumina trihydrate to form AlF3.... | 02/13/2001 |
| 6123908 | Method of treating spent potliner material from aluminum reduction cells A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. As a r... | 09/26/2000 |
| 5993758 | Process for recovery of alumina and silica A process for the simultaneous recovery of substantially pure alumina and silica from an aluminosilicate. The process comprises the following steps: (i) heating the aluminosilicate with hydrated CaCl2 to obtain calcium-alumino-silicate and calc... | 11/30/1999 |
| 5955042 | Method of treating spent potliner material from aluminum reduction cells A process for treating spent potliner material from aluminum reduction cells and recovering useful products. In the process, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. A gas component is produced wh... | 09/21/1999 |
| 5824227 | Method for removing fluoride from water A process for removing dissolved fluorides from an aqueous stream using at least two reactors wherein the dissolved fluoride containing aqueous feed and an unreacted aluminum containing sludge are combined in the first reactor to give a first reactor admi... | 10/20/1998 |
| 5585080 | Method for recovering iron chloride, aluminum chloride and calcium chloride from a leach solution The present invention relates to a method for recovering iron chloride, aluminum chloride and calcium chloride from silicon and ferrosilicon or from residues which contain silicon and/or ferrosilicon and metal chlorides and optionally copper and/or copper... | 12/17/1996 |
| 5558847 | Process for recovering aluminium and fluorine from fluorine containing waste materials Aluminum and fluorine are recovered from fluorine containing waste materials from the production of aluminum metal (FCWM) as ALF2 OH hydrate by a process comprising: leaching FCWM with dilute sulphuric acid at a pH value within the range of 0-3... | 09/24/1996 |
| 5362457 | Direct synthesis of anion substituted hydrotalcite A method for producing an anion intercalated hydrotalcite without first forming hydrotalcite and then having to activate the hydrotalcite prior to substituting anions in the hydrotalcite structure. The method includes reacting an activated magnesia with a... | 11/08/1994 |
| 5352419 | Recovery of aluminium and fluoride values from spent pot lining Process for the recovery of aluminum and fluoride values from spent pot lining materials comprising the steps of calcining spent pot lining material to produce an ash having environmentally acceptable levels of cyanide contamination, subjecting the ash to... | 10/04/1994 |
| 4937148 | Process for preparing conductive fine particles Transparent conductive coatings excellent in transparency are provided on substrates such as glass, plastics, etc. by the use of conductive coating materials obtained by maintaining aqueous solutions of hydrolyzable tin containing or indium containing com... | 06/26/1990 |
| 4865823 | Method for recovering gallium A method for recovering gallium, which comprises a capturing step of contacting an aqueous solution containing gallium to a chelating agent containing a water-insoluble substituted quinolinol as the active ingredient, to let the chelating agent capture ga... | 09/12/1989 |
| 4855114 | Dioxime kinetic enhancer for solvent extraction of gallium from basic aqueous solutions thereof Disclosed is a process for recovering gallium values contained in a basic aqueous solution by liquid/liquid extraction thereof. The liquid/liquid extraction process comprises contacting the basic aqueous solution with a water-immiscible, organic phase com... | 08/08/1989 |
| 4816122 | Preparation of aluminum fluoride from scrap aluminum cell potlinings Fluoride-containing wastes, arising in the aluminium industry, particularly spent cell linings from reduction cells, are digested with caustic soda for conversion of sodium cryolite to NaF. By use of very strong caustic soda NaF may be left in the solid residu... | 03/28/1989 |
| 4666575 | Method of recovering gallium from scrap containing gallium Scrap containing gallium and arsenic is treated with chlorine gas to form a crude gallium and arsenic chloride mixture. Arsenic chloride and impurities having a lower boiling point than that of arsenic chloride are removed from the mixture by vaporization... | 05/19/1987 |
| 4652433 | Method for the recovery of minerals and production of by-products from coal ash The method of the present invention is a novel comprehensive process for maximizing the recovery of valuable mineral values from coal ash. Options may also be included for the production of saleable inorganic chemical by-products. The process employs both... | 03/24/1987 |
| 4634581 | Production of high purity alumina A process is described for the formation of high purity alumina from Bayer Process alumina trihydrate (gibbsite). The solid hydrated alumina is reacted with concentrated HCl to cause partial or complete conversion to aluminum chloride hexahydrate (ACH). T... | 01/06/1987 |
| 4610722 | Process for metal recovery from steel plant dust A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process inv... | 09/09/1986 |
| 4560540 | Method for recovering useful products from waste products obtained when manufacturing aluminium fluoride The invention relates to a method for recovering useable products from waste products deriving from the manufacture of aluminium fluoride on the basis of aluminium hydroxide and fluosilicic acid. Mother liquors and washing water from a scrubber in said pr... | 12/24/1985 |
| 4560541 | Production of low silica content, high purity alumina A process is described for the formation of high purity alumina from aluminas such as Bayer Process alumina trihydrate (gibbsite) which contain both acid-soluble and -insoluble impurities, notably soda and silica. The solid hydrated alumina is reacted wit... | 12/24/1985 |
| 4559215 | Production of anhydrous aluminum chloride from hydrated alumina A process is described for the direct chlorination of hydrated alumina (preferably alumina trihydrate) to aluminum chloride hexahydrate (ACH) by reaction with concentrated hydrochloric acid. Preferably all of the initial hydrated alumina is converted to A... | 12/17/1985 |
| 4548795 | Treatment of aluminous materials A leaching process employing acidic chloride solutions, whereby the iron content of aluminous materials such as lower grade iron-containing bauxite ores is reduced, enabling the obtention of valuable products such as metallurgical grade alumina and refrac... | 10/22/1985 |
| 4472361 | Method of recovering alumina values from a starting solid mixture comprising AlCl3 and NaCl A starting solid mixture of AlCl3 and Nacl, which may have been obtained by acid leaching of an aluminiferous mineral and precipitation of the AlCl3 and NaCl, is mixed with water in an amount to form an aqueous solution containing Na... | 09/18/1984 |
| 4465566 | Method of producing anhydrous aluminum chloride from acid leach-derived ACH and the production of aluminum therefrom An improved process is provided for producing via ACH anhydrous aluminum chloride suitable for electrolytic reduction to aluminum wherein the feed ACH is acid leach derived. In a preferred embodiment the acid leach derived ACH is single stage crystallized... | 08/14/1984 |
| 4465659 | Aluminum production via the chlorination of partially calcined aluminum chloride hexahydrate An improved method of producing anhydrous aluminum chloride via aluminum chloride hexahydrate is provided. In a preferred embodiment the method is incorporated into a process for producing aluminum from aluminous ores, and particularly from domestic ore s... | 08/14/1984 |
| 4457812 | Critical solvent separations in inorganic systems A process for separating inorganic substances involving their abstraction from a mixture with near-supercritical inorganic fluids. One or more inorganic substances are abstracted and then separatively recovered by retrograde condensations. The process par... | 07/03/1984 |
| 4362703 | Process for preparing cryolite from fly ash Cryolite (Na3 AlF6) as a source of aluminum is prepared from coal fly ash by reacting the aluminum oxide (Al2 O3) in fly ash with phosphoric acid to form aluminum phosphate, which is then converted to sodium alu... | 12/07/1982 |
| 4339415 | Recovery of soluble alumina values from alumina bearing ores A process for the recovery of soluble alumina values from alumina-bearing ores comprising simultaneously contacting a stream containing an effective amount of a reducing agent such as SO2 and a stream containing an effective amount of an oxidiz... | 07/13/1982 |
| 4331636 | Method of producing pure alumina from alunite Pure alumina (Al2 O3) is recovered from alunite (Al2 (SO4)3.K.sub.2 SO4.4 Al (OH)3) which is found mixed with various impurities by first calcinating the alunite in the presence ... | 05/25/1982 |
| 4297326 | Method of producing a pure aluminiumoxide from solutions containing dissolved ions of aluminium and iron Method of producing aluminiumchloride with low contents of iron from solutions containing ions of aluminium and iron by precipitation of aluminiumchloride by means of hydrochloric gas where the solution from which the aluminiumchloride is precipitated con... | 10/27/1981 |
| 4297327 | Method of precipitation of pure aluminiumchloride from solutions which contain ions of aluminium and magnesium Method of producing aluminiumchloride with a low content of magnesium from hydrochloric acid solutions which contain ions of aluminium and magnesium and from which the aluminiumchloride is precipitated by hydrochloric gas and where the precipitation is ca... | 10/27/1981 |
| 4296147 | Thallous halide materials for use in cryogenic applications Thallous halides, either alone or in combination with other ceramic materials, are used in cryogenic applications such as heat exchange material for the regenerator section of a closed-cycle cryogenic refrigeration section, as stabilizing coatings for sup... | 10/20/1981 |
| 4283371 | Process for the production of aluminum chloride and related products A continuous process for recovering substantially pure aluminum chloride from chlorination products of aluminum ore. The chlorination products are contacted with a first selective solvent to dissolve a substantial portion of the aluminum chloride and some... | 08/11/1981 |
| 4252777 | Recovery of aluminum and other metal values from fly ash The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a te... | 02/24/1981 |
| 4243643 | Metallic ion removal from phosphoric acid Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions of calcium and fluorine to cause precipitation of a magnesium-containing precipitate. A preferred precipitant is one containing calcium flouride, suc... | 01/06/1981 |
| 4241030 | Continuous process for obtaining pure alumina from an acidic liquor originating from the chlorosulphuric attack of an aluminous ore and for the purification of the liquor which has been freed from alumina A process for obtaining pure alumina comprising the combination of chlorosulphuric attack of calcined aluminous ores containing impurities, followed by concentration of the liquor obtained after the attack and separation of the sterile material, sulphuric... | 12/23/1980 |
| 4239735 | Removal of impurites from clay A method for producing substantially pure alumina from kaolin clay by removing in a soluble form impurities which contaminate the alumina while the aluminum is maintained in an insoluble form. This is accomplished by leaching calcined kaolin clay with at ... | 12/16/1980 |
| 4237102 | Process for obtaining pure alumina by the hydrochloric attack of aluminous ores and extraction of the impurities by means of a sulphuric treatment A cyclic process for obtaining very pure alumina by the hydrochloric acid attack of a silico-aluminous material, the said process comprising, in a first stage, the precipitation of at most 75% of the alumina present in the liquor originating from the atta... | 12/02/1980 |
