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| Number | Title | Issue Date |
| 8119086 | Method for hydrolyzing solid metallic salts with aqueous saline solutions The invention relates to a method for hydrolyzing hydrolyzable solid metallic salts, wherein the metallic salts are reacted with aqueous saline solutions. ... | 02/21/2012 |
| 7871583 | Process for recovery of silica followed by alumina from coal fly ash A process for recovery of silica and alumina from fly ash, in which, Si is leached out from the fly ash in the form of Na2SiO3 using a NaOH solution of NaOH >40% (w/w), followed by separation to obtain a Na2SiO3 solution a... | 01/18/2011 |
| 7100994 | Producing hydrocarbons and non-hydrocarbon containing materials when treating a hydrocarbon containing formation A method for treating a hydrocarbon containing formation is provided. In one embodiment, heat from one or more heaters may be provided to at least a portion of the formation. Heat may be allowed to transfer from the one or more heaters to at least a part of the form... | 09/05/2006 |
| 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 |
| 6997518 | In situ thermal processing and solution mining of an oil shale formation An oil shale formation may be treated using an in situ thermal process. Heat may be provided to the treatment area. Fluids may be injected into the formation to remove a component within the formation. Hydrocarbons, H2, and/or other formation fluids may b... | 02/14/2006 |
| 6596252 | Recycling of spent pot linings A process is described for the treatment of spent pot lining material from electrolyte reduction cells, this spent material having a substantial content of cryolite. The spent material is first leached with water at a dilution and a time sufficient to dis... | 07/22/2003 |
| 6296817 | Process for recycling waste aluminum dross Disclosed is the recycling of aluminum dross. Aluminum dross is crushed into particles which are size-classified on the basis of 1 mm. The aluminum dross particles equal to or smaller than 1 mm in size are leached with an aqueous sodium hydroxide solution... | 10/02/2001 |
| 6153155 | Recovery of the transition metal component of catalyst used in heavy feed hydroconversion The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is ca... | 11/28/2000 |
| 5951955 | Concentration of solids in the Bayer process Processes for improving solids/liquids separation efficiency in the Bayer process are disclosed, wherein solids are flocculated with hydroxamated polymers and centrifuged.... | 09/14/1999 |
| 5939035 | Process for treating spent potlining containing inorganic matter The present invention relates to a process for reducing and/or removing inorganic matter from a material containing inorganic matter which comprises the steps of: (i) (a) treating the material with a source of hydrogen fluoride so as to form a first resid... | 08/17/1999 |
| 5904856 | Process for the preparation of aluminum salt solutions The present invention relates to a process for the preparation of solutions of aluminum salts, characterized in that an aluminate of an alkali metal and/or alkaline earth metal is dissolved in an acid solution to the formation of a solution which is used ... | 05/18/1999 |
| 5792236 | Non-toxic liquid metal composition for use as a mercury substitute Liquid gallium or gallium alloy is utilized as a mercury substitute for a variety of applications. The liquid gallium or gallium alloy is either free of metal oxides or has only very low quantities of metal oxides.... | 08/11/1998 |
| 5776426 | Treatment of solid material containing fluoride and sodium including mixing with caustic liquor and lime A process for treatment of a solid material containing fluoride and sodium, such as spent potlining from aluminum reduction cells, comprising the following steps: 1) contacting the solid material with recycled caustic liquor and source of calcium in a dig... | 07/07/1998 |
| 5723097 | Method of treating spent potliner material from aluminum reduction cells A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry compo... | 03/03/1998 |
| 5653946 | Process for fluidifying aqueous suspensions of red muds in the production of alumina by the bayer process Improved process for fluidifying flocculated aqueous suspensions of red muds in the production of alumina from bauxite by the Bayer process, which consists: in dissolving bauxite using sodium hydroxide; then, in decanting and in washing the red muds formed in ... | 08/05/1997 |
| 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 |
| 5470559 | Recycling of spent pot linings A process for recycling spent potlining material from aluminum reduction cells contaminated with fluoride and aluminum values. The process comprises first reducing the average particle size of the spent potlining material to smaller than 28 Tyler mesh to ... | 11/28/1995 |
| 5385586 | Liquor oxalate stabilizers A method for inhibiting the precipitation of sodium oxalate crystals in a Bayer process liquor. The method comprises the step of adding to the Bayer process liquor, after red mud separation and immediately prior to crystallization of alumina trihydrate, o... | 01/31/1995 |
| 5364603 | Mercury-free dissolution of aluminum-clad fuel in nitric acid A mercury-free dissolution process for aluminum involves placing the aluminum in a dissolver vessel in contact with nitric acid-fluoboric acid mixture at an elevated temperature. By maintaining a continuous flow of the acid mixture through the dissolver v... | 11/15/1994 |
| 5330618 | Process for separating dissolved solids from a liquid using an anti-solvent and multiple effect evaporators A process and system for treating aluminum salt cake containing water soluble halide salts by contacting the salt cake with water to dissolve water soluble halide salts forming a saturated brine solution. Transporting a portion of about 25% of the saturat... | 07/19/1994 |
| 5308595 | Process for the extraction of gallium Gallium is efficiently extracted from strongly basic solutions containing aluminates by extractants having the tris- and/or tetrakis(2-hydroxybenzyl)-1,2-diaminoethane chemical moiety. The diaminoethane derivative may be used together with a hydrocarbyl ... | 05/03/1994 |
| 5290535 | Process for recycling saltcake Saltcake generated by the aluminum industry is completely recycled through a process that simultaneously liberates the contained aluminum metal and dissolves the soluble salt fluxes to recover aluminum metal, aluminum oxide and salt fluxes by temperature ... | 03/01/1994 |
| 5282938 | Process for recovery of trace metals and salts from waste combustion residues A method for the continuous treatment of air pollution control residues from various resource recovery systems whereby the air pollution control residue is treated with a dilute salt extracting solution at a pH chosen to maximize the recovery of lead, for... | 02/01/1994 |
| 5245116 | Process for the wet treatment of spent pot linings from hall-heroult electrolytic cells A process for the treatment of spent pot linings impregnated with alkali metal cyanide and fluoric products by grinding previously crushed pot linings in the presence of lime, suspending the ground pot linings in an aqueous medium in order to precipitate ... | 09/14/1993 |
| 5242670 | Method for hydrofluoric acid digestion of silica/alumina matrix material for the production of silicon tetrafluoride, aluminum fluoride and other residual metal fluorides and oxides A process for hydrofluoric acid digestion of inorganic silica/alumina matrix material for the production of silicon tetrafluoride and aluminum fluoride comprises the initial step of reacting the matrix material with hydrofluoric acid, to form silicon tetr... | 09/07/1993 |
| 5227143 | Process for the removal of salts from aluminum dross A process is disclosed for treating salt-containing aluminum dross to remove potassium and sodium chloride salts therefrom. The process generally comprises treating the dross in a first treating step with a leaching solution having a pH maintained in the ... | 07/13/1993 |
| 5221327 | Biological processes for recovering heavy metals Disclosed is an efficient biological process for recovering heavy metals from refractory manganiferous ore, and a process for removing heavy metal contaminants from the soil. The process utilizes manganese reducing Bacillus sp. Specifically exemplified is... | 06/22/1993 |
| 5211922 | Process for the recovery of values from secondary aluminum dross A process for recovery of metallic aluminum, sodium and potassium chloride and an aluminum oxide-metallic aluminum product from secondary aluminum dross. A secondary aluminum dross feed is separated by particle size into a first dross portion which is wat... | 05/18/1993 |
| 5204074 | Recovery of gallium values from basic aqueous solutions thereof Gallium values are recovered from basic aqueous solutions thereof, e.g., Bayer liquors, by (i) contacting such basic aqueous solution (A) with a medium (I) containing a gallium extractant, whereby the gallium values are transferred to the medium (I), (ii)... | 04/20/1993 |
| 5198200 | Process for the recovery of values from secondary aluminum dross A process for the recovery of metallic aluminum, mixtures of salts, and an aluminum oxide-metallic aluminum product from secondary aluminum dross. The process includes treating the dross with leach water to dissolve the salt content. Magnesium chloride is... | 03/30/1993 |
| 5167831 | Non-ionic surfactants plus fatty-acids as dewatering aids for alumina trihydrate Tall oily fatty acids when combined with certain non-ionic surfactants having an HLB number from 10-14 are superior dewatering agents for Bayer Process alumina trihydrate filter cakes.... | 12/01/1992 |
| 5143599 | Process for refining kaolin A process is disclosed for producing high brightness kaolin from ore containing silica, other types of clays, minerals such as ilmenite micas, feldspars and various metal silicates as well as organic matter. The process consists of sizing, a double floata... | 09/01/1992 |
| 5118484 | Desilication of Bayer process solutions A process is described for removing dissolved silica from process solutions or slurries formed in the Bayer process for producing alumina from bauxite. In the novel process, a Bayer process solution or slurry is contacted with porous agglomerates of a mat... | 06/02/1992 |
| 5096678 | Method and apparatus for beneficiating ores A method and apparatus for treating mineral-bearing ores and, more particularly, for treating ores containing precious metals, base metals and the like values by providing a means to extract the metal or other values from a particulated ore by classifying... | 03/17/1992 |
| 5091160 | Use of microwave radiation to eliminate foam in ore leaching A method of eliminating the foam above a slurry of a corrosive liquid and solid matter where the foam is caused by a gas evolved by the reaction between the heated corrosive liquid and the solid matter comprising providing the heating energy by microwaves... | 02/25/1992 |
| 5080721 | Process for cleaning particulate solids A system for cleaning solids contaminated with solvent-soluble contaminants. The system, which includes both process and apparatus, comprises the use of at least two successive cleaning zones, each of which includes a slurrying stage and a centrifuge sepa... | 01/14/1992 |
| 5074911 | Heterocyclic thione A process for extracting metal values such as gallium and/or indium from aqueous solutions by contacting said solutions with a water immiscible organic solvent having dissolved therein a heterocyclic thione.... | 12/24/1991 |
| 5063033 | Process for the production of boehmite The present invention provides a process for the production of crystalline boehmite of fine particle size and enhanced specific surface area. Coarse gibbsite particles, obtained from the Bayer Process, are lightly calcined and the non-boehmite-containing ... | 11/05/1991 |
| 5051243 | Process for increasing the specific gravity of red mud solids This invention provides an improved process for increasing the specific gravity of red mud. The process comprises mixing red mud in an acidic solution, such as sulfur dioxide solution, having a pH of between about 1.5 and about 3.0 to form an insoluble re... | 09/24/1991 |
| 5030426 | Biomining of gallium and germanium containing ores Disclosed is a high temperature process (e.g.>60° C.) for leaching selected metal compounds e.g. gallium or germanium from ore containing those compounds. The method includes placing the ore into a culture medium containing bacteria. Bacteria capable of ... | 07/09/1991 |
