Matches 101 - 150 out of 213 < 1 2 3 4 5 >
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4145397 Process for recovering molybdenum, vanadium, cobalt and nickel from roasted products of used catalysts from hydrotreatment desulfurization of petroleum  
From roasted products of used catalysts from hydrotreatment desulfurization of petroleum, valuable molybdenum, vanadium, cobalt and nickel are recovered easily and a high percent recovery by means...
4133866 Process for the selective separation of the bound sodium content of red mud  
The invention relates to a novel process for the selective recovery of the sodium content of red mud originating from alumina plants. According to the process of the invention red mud or a slurry...
4119698 Reclamation treatment of red mud  
The red mud by-product of the Bayer process by which aluminum oxide is reed from bauxite as an aluminate, is digested with concentrated sulfuric acid or with sulfur trioxide gas to produce sulfates...
4117077 Process for alunite treatment  
A process for alunite ore treatment which comprises roasting alunite in the presence of oxygen at a temperature of from 580° to 620° C. for 1 to 3 hours, decomposing the roasted alunite by...
4113832 Process for the utilization of waste materials from electrolytic aluminum reduction systems  
A fully integrated process is provided for the recovery of valuable components from waste materials generated in electrolytic aluminum reduction systems. The waste materials, such as spent pot...
4113833 Process for the production of alumina from the mineral component of solid fuels  
The invention relates to a process for the production of alumina from mineral component of solid fuels containing aluminum, silicon and iron oxides. The process comprises burning a mixture of a...
4093700 Process for reduction of alunite ore in aluminum recovery process  
The invention is an improvement in the method for recovering aluminum values from alunite ore by roasting the ore to remove water, reducing the ore by roasting it in a reducing atmosphere to remove...
4091071 Process for digesting goethite-containing bauxites according to the Bayer technology  
The invention relates to an improved process for the production of alumina according to the Bayer technology, of bauxites containing goethite and especially of boehmitic or diasporic bauxites, for...
4073662 Method for removing a magnesia doped alumina core material  
Ceramic mold and core materials of magnesia doped alumina are removed from castings by a solution of either KOH or NaOH at elevated temperatures and pressures in an autoclave.
4071422 Process for concentrating and recovering gallium  
Gallium and other values are recovered from phosphorus-furnace flue-dust by treating dust with sulfuric acid to form a solution and a residue. The residue may be treated for recovery of values....
4064217 Process for recovering aluminum from alunite ore  
An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by...
4059672 Method of digesting bauxite via the Bayer process with the addition of reducing agents  
The settling rate of caustic alkali-digested goethite-containing bauxite or laterite, or the like, is increased by carrying out the digestion in the presence of a reducing agent capable of reducing...
4057611 Process for recovering aluminum from alunite  
An improvement in the process for the recovery of aluminum from alunite in which the alunite in particulate form is dehydrated, sulfur and alkali metal compounds removed from the dehydrated ore...
4048285 Process for the extraction of alumina from minerals, rocks and industrial by-products  
The invention concerns a process for solubilizing alumina in minerals, rocks or industrial waste products, in which the starting material in finely divided form is mixed with lime in an amount 1 to...
4045537 Process for recovering soda and alumina values from red mud  
A process is disclosed for recovering the caustic and alumina values from high iron-containing Bayer red mud utilizing the so-called lime-soda-sinter process wherein a carbonaceous material such as...
4044095 Process for recovery of alumina from high-silica ore  
Back reactions of dissolved alumina from a high caustic-lime digest of anorthosite and other alumina-containing siliceous materials can be eliminated or mitigated by control of particle size of...
4031182 Recovery of aluminum from alunite ore using acid leach to purify the residue for bayer leach  
A process for recovering aluminum from alunite ore directed to providing a residue for the Bayer leach step substantially free of impurities so that a high A/C ratio Bayer leach liquor is produced,...
4029499 Recovery of gallium  
This invention relates to an improvement in the well known "Bayer" process. In particular, the invention describes a process for the recovery of gallium and alumina from bauxite including the steps...
4029737 Redox treatment of alunite ore  
This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate,...
4026989 Process for the digestion of goethite-containing bauxites  
The present invention provides for an improvement in the Bayer Aluminum manufacturing process wherein the digestion of goethite-containing bauxite is effected in higher yields, at lower...
4016238 Process for the obtention of alumina and phosphate values by the alkaline decomposition of silica-containing aluminum phosphate ores  
A process for the obtention of alumina and phosphate values by the alkaline decomposition of silica-containing aluminum phosphate ores comprises reducing the ore to a particle size of from about 6...
3998927 Recovery of sodium aluminate from high-silica aluminous materials  
An improved process is provided for the recovery of sodium aluminate crystallized from a digest of caustic and lime with high-silica aluminous materials. The digest solution is concentrated by...
3997650 Process for extracting alumina from alumna-containing ores  
In a process for extracting alumina from alumina-containing ores by individually preheating a slurry of alumina-containing ores in alkali solution, and an alkali solution, and feeding the preheated...
3988150 Process for extraction of gallium from sodium aluminate liquors  
A process for the extraction of gallium from sodium aluminate liquors comprises extracting gallium from aluminate liquors by cementation with the aid of a liquid gallium-aluminum alloy. Aluminate...
3984521 Method of producing alumina and potassium sulphate from alunite  
A method for processing alunite consisting in that alunite ore is treated with a solution of caustic alkalis at a maximum temperature of 60°C, and a solid residue resulting from the above...
3975496 Process for settling red mud in the digestion of bauxite  
The invention provides novel water-soluble copolymers useful as flocculating agents, especially in flocculating the red mud formed during the Bayer process for the production of alumina from...
3969108 Recovery of gallium  
This invention relates to the recovery of gallium from scrubber dust containing aluminum and fluoride. In carrying out the process of the invention gallium is recovered from a particulate solid of...
3966874 Extraction of alumina from bauxite ores  
An improved wet caustic process of the Bayer method for the extraction of alumina from bauxite containing amounts of both goethite and a monohydrated alumina wherein lime is added only after the...
3961971 Method for improving brightness of kaolinite clays including iron pyrites  
A method for preparing a coating grade kaolin clay from a crude clay including discoloring iron contaminants in the form of iron pyrites. The clay is roasted in an oxidizing atmosphere to convert...
3955969 Process for the production and use of activated alumina  
Production of an activated type alumina from aluminum dross by digestion with water, preferably pressurized. The peculiar properties associated with trace compounds present in the product make it...
3944648 Method for processing bauxites  
A method for processing bauxites according to the Bayer technology, with an increased yield in Al 2 O 3 and with decreased caustic soda losses, starting particularly from goethite bauxites of...
3927172 METHOD OF CONCENTRATING GALLIUM  
It was found that the gallium in phosphorus furnace treater dusts can be concentrated by contacting the treater dust with a slurry of an alkaline earth compound, such as calcium hydroxide, and...
3890427 Recovery of gallium  
A process for the recovery of gallium from solutions containing the same in admixture with aluminum and caustic which comprises adding silica or silica and alumina to such solutions to selectively...
3890426 Method of treating alunite ore  
This invention relates to a method for recovering aluminum hydroxide from ore containing alunite by roasting the ore to remove the water of hydration, leaching the roasted ore with a weak base to...
3879520 Method for dissolving ceramic beryllia  
A process for dissolving a nuclear fuel composition consisting of 1. A sintered mass containing beryllia, a nuclear fuel selected from uranium and plutonium and a stabilizing agent, sintered at a...
3876749 Method for the reduction treatment of red mud  
The red mud by-product of the Bayer aluminum manufacturing process is utilized by mixing the red mud with a reducing agent, reducing the red mud, separating it into molten steel and molten slag,...
3867197 Process for the releasing of materials from voluminous precipitates or suspensions  
Voluminous precipitates or suspensions are contacted countercurrently with liquid purification or extraction agents that hold the continuously supplied precipitate or suspension in the upwardly...
3862293 PROCESS FOR THE CONTINUOUS ACID TREATMENT OF CRUDE CLAYS AND SCHISTS  
A process for the continuous treatment of alumino-ferrous ore of the clay or schist type for recovery of alumina, iron, magnesium and alkali metals, including the steps of attacking the crude ore...
3860688 PRODUCTION OF HIGH PURITY ALUMINA HYDRATE  
Leachable soda content (expressed as Na 2 O) of Bayer process alumina hydrate (Al 2 O 3 . 3H 2 O) is reduced to below about 0.015 percent by weight by directly treating a slurry of the hydrate...
3857719 TREATMENT OF CLAYS  
Process and system for improving the brightness of clays to a point where the reflectance of light from the clay in dry form reaches a predetermined selected value. The process involves the...
3853984 CONTROLLING THE LEACHING OF KAOLIN CLAY  
A process for improving the leaching of kaolin clays to provide high grade kaolin clay products having improved optical properties and minimum viscosities upon dispersion with a minimum amount of...
3819337 SEPARATION OF MACROCRYSTALLINE NON-SOLVATED ALUMINUM HYDRIDE  
1. A process for separating macrocrystalline, non-solvated aluminum hydride from finely divided aluminum hydride contaminant material which comprises; A. providing a mixture of a macrocrystalline...
3764664 PROCESS FOR THE PRODUCTION OF ACTIVE ANHYDROUS ALUMINUM CHLORIDE  
Aromatic ketocarboxylic acids represented by the formula, ##SPC1## Wherein R 1 and R 2 are individually hydrogen, chlorine, or a straight or branched lower alkyl or a substituted or unsubstituted...
3721730 ALUMINA RECOVERY FROM RETORTED OIL SHALE RESIDUE  
Alumina is recovered from a dawsonite-bearing oil shale matrix by treatment of the retorted oil shale residue or spent shale containing fixed carbon with a dilute aqueous soda ash-caustic soda...
3714313 AGGLOMERATING PARTIALLY DEHYDRATED GEL-DERIVED PSEUDOBOEHMITIC ALUMINA TO FORM STRONG POROUS SPHERES  
Gel-derived crystalline alumina containing at least 40 percent pseudoboehmite and having low cationic and anionic impurity levels is partially dehyrated to an LOI of 22-34 percent, ground to at...
3655339 PRODUCTION OF LOW-SODA ALUMINA  
Production of a low-soda alumina by calcining an alumina starting material of low-soda content at 1,100°-1,400° C followed by leaching. The starting alumina material contains less than 0.25...
3650679 REFINING LOW-GRADE BERYLLIUM ORES BY TREATMENT WITH ANHYDROUS SULFUR TRIOXIDE  
Low-grade substantially dry beryllium-containing ores are reacted directly with anhydrous sulfur trioxide, at temperatures ranging from 50° to 350° C., to form beryllium sulfate. The reaction...
3647372 METHOD OF RECOVERING ALUMINA FROM ALUNITE AND ALUMINOSILICATE MATERIALS  
A method for extracting pure alumina from alunite and aluminosilicate ores having a high-SO 3 content wherein a mixture of at least two alkali chlorides is added to the ore and the combined ore...
3632310 PROCESS FOR MANUFACTURING ALUMINA  
In both the European and American versions of the Bayer alumina process, precipitation of alumina trihydrate from the caustic solution is limited to about one-half of the alumina in solution, in...
3615260 LEACHING BERYLLIUM  
A method of leaching beryllium from beryllium ore and separating the beryllium from contaminates in the leach liquor, the leaching method comprising exposing beryllium ore to a concentrated caustic...
Matches 101 - 150 out of 213 < 1 2 3 4 5 >