Matches 51 - 100 out of 213 < 1 2 3 4 5 >
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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...
4798708 Process for recovering chromium and other metal values from chromium bearing material  
A process is disclosed for recovering metals from chromium bearing material comprising one or more or the metals of cobalt, nickel, molybdenum, tungsten, iron, tin, aluminum. The process comprises...
4732606 Process of treating aluminum-containing fused slag  
A method of recovering a metallic aluminum from an aluminum-containing slag of an aluminum smelting process. In this method, the slag is crushed a number of times with each crushing product being...
4729881 Hydrometallurgical process for the production of beryllium  
Beryllium is efficiently recovered from silicate ores in a hydrometallurgical, single solvent, process which avoids the complexities, high costs and hazards ofpyrolytic, fluorination and acid leach...
4717550 Process for purifying alumina  
The iron content of Bayer process streams is reduced by contacting said stream with a tertiary hydroxyl-containing polyamine.
4670229 Cyclic process for recovering metal values and alumina from spent catalysts  
Metal values and alumina are recovered from spent, usually oily, catalysts by oxygen pressure leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten...
4668487 Alkaline processing of naturally occurring calcium aluminium and iron phosphates  
A process for production of alkali metal phosphates from material containing calcium, iron and aluminium phosphates, for example naturally occurring phosphate rocks, involves calcining the material...
4666685 Selective extraction of molybdenum and vanadium from spent catalysts by oxidative leaching with sodium aluminate and caustic  
Spent hydrodesulfurization catalysts containing alumina, at least one metal from the group consisting of molybdenum, tungsten and vanadium and at least one metal from the group consisting of nickel...
4649031 Process for recovering rare metals from the combustion residue of coal by digestion  
The invention relates to a method for recovering rare metals from the combustion residues of various coals, in particular brown coals. The recovery is performed by digestion, more particularly by...
4647439 Process for the continuous production of alumina from bauxites containing monohydrates using the bayer process  
A process for the continuous production of alumina by means of the Bayer process by alkaline attack in reactors on bauxites which primarily consist of aluminum monohydrates and contain silica in a...
4617410 Process for the production of pure cis-platinum-(II)-idiammine dichloride  
Cisplatin is purified via an adduct with dimethylformamide. The purified cisplatin is useful as a medicine.
4614641 Parallel purification of alumina with physical pretreatment  
Disclosed is a process for producing purified alumina from high-silica bauxite including separating alumina-rich ore containing high-silica content into a coarse fraction and a fines fraction;...
4614543 Mixed lixiviant for separate recovery of zinc and lead from iron-containing waste materials  
A process is disclosed for the hydrometallurgical treatment of finely divided iron-containing steel plant dusts containing zinc, lead and such other metal values as calcium, manganese, silicon,...
4610721 Two-stage leaching process for steel plant dusts  
A process is provided for selectively recovering zinc from steel plant dust containing substantial amounts of iron. The process comprises atmospherically leaching the steel plant dust in a first...
4609535 Extracting soluble phosphates from naturally occurring iron and aluminium phosphates using solutions of alkali metal carbonates and hydroxides  
A process for production of alkali metal phosphates from material containing iron and aluminium phosphates comprises leaching the said material with alkali metal carbonate solution to produce a...
4587004 Process for beneficiating oil-shale  
Disclosed is a process for beneficiating oil-shale wherein the oil-shale is treated in a first stage with an aqueous ammonium salt solution and in a second stage and optionally a third stage in the...
4587005 Process for beneficiating Rundle oil-shale  
Disclosed is a process for removing mineral matter from Rundle oil-shale by contacting the oil-shale with (a) an ammonium salt solution and (b) an organic solvent, at a temperature from about 0°...
4584088 Method for treating shale  
A method for producing a kerogen concentrate from oil shale comprises treating shale with a first aqueous caustic treating solution to produce a shale product of substantially transformed mineral...
4557907 Hydrothermal disintegration of calcined aluminum oxide wastes  
A process for hydrothermally disintegrating wastes or residues having a high content of calcined aluminum oxides by reacting said wastes or residues with an aqueous sodium hydroxide solution having...
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...
4548794 Method of recovering nickel from laterite ores  
According to the present invention, processes are provided for recovery of nickel, cobalt and like metal values from laterite ores wherein the ores are separated into high and low magnesium...
4541994 Method of liberating nickel- and cobalt-enriched fines from laterite  
According to the present invention, Ni- and Co-rich, low Mg fines may be advantageously separated from the coarse fractions of lateritic ores by atmospheric or low pressure leaching. In particular,...
4499062 Hydrothermal decomposition of aluminum silicates  
A process for the hydrothermal fusion of aluminum silicate and alkali aluminum silicates with aqueous sodium hydroxide solution under pressure and at elevated temperatures in the presence of...
4497778 Microbial leaching of sulphide-containing ores  
A process of extracting metals from a material containing at least 10% by weight of pyrite and selected from the group consisting of ores containing sulphide, concentrates of such ores and mixtures...
4483934 Process for beneficiating bentonite  
Raw bentonite is beneficiated by treating a substantially iron oxide-free bentonite, as an aqueous suspension, with an alkali at a temperature of at least 60° C.; washing the alkali treated...
4483830 Production of alumina  
A process for recovery of alumina and soda from materials containing sodium aluminosilicates, such as red mud and desilication products, comprises treating said materials with lime at elevated...
4477422 Reducing slurry viscosity of kaolinitic clays  
The low shear, slurry viscosity of a kaolinitic clay that is contaminated with one or more forms of expanding clay is reduced by mixing the clay with a source of cationic potassium and then heating...
4468375 Production of alumina from aluminum-containing mineral ores with sodium bicarbonate  
A process for the production of alumina from aluminum-containing mineral ores, such as bauxite, comprising comminuting the aluminum-containing mineral ore, then reacting the comminuted mineral ore...
4461714 Method of making crystalline 2-layer lithium aluminates in ion exchange resins  
The bayerite form of crystalline alumina, Al(OH) 3 , contained within a macroporous ion exchange resin is converted to the gibbsite form of Al(OH) 3 by reaction with hot MgX 2 , where X is halide,...
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...
4451440 Utilization of ion exchange resin in the processing of kaolins  
A method of processing naturally occurring kaolin clay wherein ion exchange resins are utilized to remove charged soluble impurities from the clay thereby eliminating the filtration step required...
4421726 Method of pollution control involving the absorption of sulfur dioxide from stack gases  
A process for removing sulfur dioxide from effluent gas and for recovering amphoteric components such as alumina from solid inorganic combustion byproducts.
4405588 Process of removing iron impurities from ores  
A process of removing iron impurities from ores, particularly useful for removing stains of iron impurities adhered to silica sand particles, comprises grinding the ore, washing and desliming the...
4401638 Process for purifying silica sand  
A process of purifying silica sand comprises grinding sandstone, washing and desliming the ground sandstone to remove the major part of the clay-type binder, attrition-scrubbing the deslimed sand...
4397822 Process for the recovery of alumina from fly ash  
An improvement in the lime-sinter process for recovering alumina from pulverized coal fly ash is disclosed. The addition of from 2 to 10 weight percent carbon and sulfur to the fly ash-calcium...
4388280 Extraction of aluminum from clay  
A process for recovery of aluminum from clay comprising treating the crushed clay with water in the form of a fine mist, and in an amount sufficient to form compact surfaces on the particles...
4386057 Recovery of iron oxide from coal fly ash  
A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the fly ash is separated and...
4353753 Cleaning boiler tubes of digesting heat exchangers used in alum earth processing  
The invention relates to plant operations for increasing the cycle times of heat exchangers by the digestion of the aluminium oxide content of a slurry according to the Bayer technology, said...
4348366 Process for the production of alumina and alumina compounds from wastes  
A process for the recovery of substantially all of the aluminum from aluminum bearing waste products which includes a method for the commercial production of alumina and compounds of alumina.
4342729 Method for obtaining alumina from clays  
Disclosed is a method for obtaining alumina from silicates by calcining a dry mixture of the silicate and an alkali metal or ammonium salt, such as the sulphate, bisulphate, sulphite, etc. and...
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 SO 2 and a...
4307066 Extraction of metals from mixtures of oxides or silicates  
Metals are extracted from mixtures of oxides or silicates by reacting the mixture at elevated temperature with a gaseous chlorinating agent comprising a mixture of water vapor and hydrogen chloride...
4297131 Processing of titaniferous materials  
An improved method of extracting titanium from titaniferous materials by reaction with thionyl chloride to form titanium tetrachloride which is separated from the reaction products by...
4265864 Process for treating bauxite or similar raw material  
When an alkali such as an alkali metal bicarbonate or carbonate is intimately mixed with bauxite or other alumina-containing raw material at an Al 2 O 3 /Na 2 O molar ratio of from 1/1 to 1/3...
4256709 Method for the production of alumina  
An improved method for recovering aluminum values from alkaline aluminosilicate raw material by sintering a comminuted aqueous mixture of the alkaline aluminosilicate material, limestone and soda...
4252776 Aluminum dross processing  
There is disclosed a method for the elimination of the chief impurities in aluminum dross tailings. The dross tailings, which are chiefly particles of aluminum oxide, are suspended in an aqueous...
4250032 Process for the disposal of bauxite processing wastes and their containment into filling basins  
The invention relates to a process for the disposal of bauxite processing wastes comprising the steps of: (a) filtering the bauxite muds in suspension coming from the washing decanter, (b)...
4234429 System for separating particulate matter into soluble and insoluble portions  
Particulate matter collected by an environmental air quality control device may be in part toxic in nature and thus not readily disposable. By separating the toxic portion of the particulate matter...
4229182 Recovery of aluminum from composite propellants  
Aluminum is recovered from solid rocket propellant containing a small amount of oxidizer by depolymerizing and dissolving propellant binder containing functional or hydrolyzable groups in a...
4226838 Process for accelerating the digestion and sedimentation steps on the Bayer alumina process  
An improved process for accelerating the digestion process in the Bayer alumina process is provided which promotes both the goethite-hematite conversion and a more perfect and quick dissolution of...
Matches 51 - 100 out of 213 < 1 2 3 4 5 >