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7556095 |
Solution mining dawsonite from hydrocarbon containing formations with a chelating agent
A method for treating an oil shale formation comprising dawsonite includes providing heat from one or more heaters to the formation to heat the formation. Hydrocarbon fluids are produced from the...
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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...
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6627165 |
Process for upgrading a titaniferous material containing silica
A process for upgrading of titaniferous material containing silica, including pretreating the titaniferous material by alkaline leaching to precipitate the silica as an aluminosilicate which is...
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6608001 |
Catalyst and method of making micrometer sized spherical particles
A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method...
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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...
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6576204 |
Process for the production of alumina
A process for the production of alumina is performed by dissolving gibbsite Al 2 O 3 .3H 2 O in nitric acid to provide an acid solution containing aluminum nitrate; decomposing the acid solution at...
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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...
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6451273 |
Method of producing an active mineral liquid from granite
A method of extracting active mineral liquid from a rock such as granite is described. This method comprises charging an extraction vessel with finely divided granite at ambient temperature and...
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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...
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6284207 |
Process for producing high surface area material by controlled leaching of blast furnace slag
A material with high surface area can be obtained through the partial or total removal of CaO and MgO by acid leaching of blast furnace slag. This is accomplished by an improved process for...
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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...
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6231822 |
Recovering chloride and sulfate compounds from spent potliner
A method of recovering chloride and sulfate salts from spent potliner using acid digestion.
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6217840 |
Production of fumed silica
A method for producing fumed silica and a fluorine-containing product from a source of silica in solid form and a solid material containing fluorine, the solid material selected from the group...
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6217836 |
Recovering carbon, silica and alumina from spent potliner
Spent potliner from aluminum reduction cells is treated, for example, with sulfuric acid to recover carbon, silica and alumina or to recover a vitrified product of silca and alumina.
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6193944 |
Method of recovering fumed silica from spent potliner
Spent potliner from an aluminum reduction cell is subject to an acid digest and the digest may be adjusted to produce a first gas component comprised of at least one material selected from the...
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6187275 |
Recovery of AlF3 from spent potliner
A method of recovering AlF 3 from spent potliner using an acid digest to form gaseous HF which is converted to hydrofluoric acid and reacted with alumina trihydrate to form AlF 3 .
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6153157 |
Value improvements of clays
A process which allows the conversion of clay minerals of the kalonite group, to a relatively pure form of alumina and silica respectively comprising the steps of (a) heating the kaolinite group...
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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...
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6110434 |
Recovery of products from non-metallic products derived from aluminum dross
A process for recovering one of alumina hydrate, magnesium hydroxide and magnesium aluminate spinel (MgAl 2 O 4 ) from aluminum dross wherein the dross is processed to a non-metallic product...
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6110433 |
Process for the recovery of metals from used nickel/metal/rare earth hydride storage batteries
The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a...
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5997828 |
Process for production of alumina from ore bodies containing aluminum
A process for extraction of alumina from ore bodies containing aluminum is disclosed. The process comprises the steps of acid leaching an aluminum bearing ore to produce a leach liquor that...
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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...
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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...
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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...
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5888404 |
Method for treating waste water sludge
The invention relates to a method for treating waste water sludge comprising at least one metal originating from a waste water treatment coagulant, and phosphorus and heavy metals in order to...
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5843861 |
Process for the synthesis of kaolin clays having varying morphological properties
Substantially crystalline kaolin clays having varying morphological properties are produced by the hydrothermal treatment, in an acidic environment, of substantially amorphous calcined kaolin clay.
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5830818 |
Process for the microwave beneficiation of discolored kaolin clay materials
Kaolin clay materials containing discoloring impurities can be beneficiated by microwave irradiation in the presence of water and a polyprotic acid component to produce a beneficiated kaolin clay...
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5800716 |
Processes for the treatment of acidic liquors and for the production of commercial products thereby
A process for the treatment of aqueous acidic liquors containing dissolved aluminum and/or iron compounds to produce an aluminum and/or iron sulfate water-treatment product is characterized by the...
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5575981 |
Method for acidic leaching of lateritic ores
The invention provides an autoclave configuration for pressure leaching lateritic ores at elevated temperatures. The autoclave configuration includes at least one primary autoclave. The primary...
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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 ALF 2 OH hydrate by a process comprising: leaching FCWM with dilute...
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5518660 |
Aqueous colloidal dispersions of sub-micrometer alumina particles
An aqueous alumina dispersion prepared from high quality, submicrometer alumina powder, suitable for manufacturing fine ceramic products, is disclosed. The sub-micrometer alumina particles have a...
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5431892 |
Process for recovering valuable metal from waste catalyst
A process for recovering valuable metals from a waste catalyst based on an alumina carrier includes (a) roasting the waste catalyst at a temperature range of 400° to 1,000° C. to obtain a roasted...
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5415849 |
Process for dissolving used catalyst
A process for dissolving used catalyst includes the steps of roasting, after subjecting to an optional deoiling treatment, the used catalyst at a temperature lower than 1,000° C. but not lower...
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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...
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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...
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5278069 |
Bioleaching method for the extraction of metals from coal fly ash using thiobacillus
A bioleaching process is utilized for the extraction of metals from coal fly ash (CFA). The CFA is suspended in an acidic sea water based culture medium and the suspension is incubated with a...
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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...
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5171547 |
Recovery of chromium in high purity state from waste materials of etching operations
The present invention is directed to a method for treating a sludge containing substantial amounts of chromium, aluminum, calcium, iron, and phosphorous. The method comprises forming a slurry of...
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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...
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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...
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5053144 |
Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry
The method of the invention is advantageously applicable to realize a multistage chemical process during which liquid clarifiers suitable for the purification of water and sewage, furthermore,...
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5019360 |
Method for the processing of fly ash, scrubber sludge and the like; and product
A method for the processing of fly ash scrubber sludge or the like is provided. The method yields unique products, including a usable calcium silicate material and a high purity alumina material....
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4954322 |
Process for the recovery of metal values contained in a gangue
The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric...
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4954168 |
Reclaiming of aluminum-chromium waste materials from etching operations
A method is provided for treating sludge containing substantial amounts of chromium, aluminum and iron and residuals of other elements. The method comprises forming a slurry of the sludge in water...
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4952388 |
Method of treating phyllosilicates
There is disclosed a method of treating phyllosilicate materials by exposing the materials to a source of hydrogen ions to hydrate hydroxyl ions on and in the phyllosilicate structure. The source...
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4889695 |
Reclaiming spent potlining
Disclosed in a process for recovering aluminum flouride, caustic, and carbon from spent potlining retrieved from an aluminum electrolytic reduction cell. Spent potlining is treated by leaching with...
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4886616 |
Aluminum surface cleaning agent
Chromium free cleaning compositions for cleaning aluminum and aluminum alloy surfaces comprising A. from 0.2-4 g/l ferric ion and B. sufficient sulfuric and/or nitric acid to produce a pH of...
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H000715 |
Recovery of mercury from acid waste residues
Mercury can be recovered from nitric acid-containing fluids by reacting the fluid with aluminum metal to produce mercury metal, and then quenching the reactivity of the nitric acid prior to...
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4871696 |
Method for producing substantially pure materials
A method for producing materials having a high purity, which comprises forming an oxidation reaction product of a parent metal and an oxygen-containing vapor-phase oxidant, comminuting the...
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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...
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