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7553474 |
Method for producing metal oxide sol
It is an object to provide a method for producing stable alkaline metal oxide sols having a uniform particle size distribution. The method comprises the steps of: heating a metal compound at a...
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7494630 |
Method of stripping metals from organic solvents
A new method to strip metals from organic solvents in a manner that allows for the recycle of the stripping agent. The method utilizes carbonate solutions of organic amines with complexants, in low...
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7338589 |
Process for recovery of gallium
The present invention relates to a process for the recovery of gallium from Bayer process liquors. Bayer process liquor is obtained from alumina industries and contains 450 g/L Na 2 O, 80 g/L Al 2...
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7288184 |
Process for mitigating acids in a system for separating aromatic hydrocarbons from a hydrocarbon feedstream
Disclosed is a process for removing acids in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the...
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6846470 |
Methods for producing indium-containing aqueous solutions containing reduced amounts of metal impurities
A method for producing an indium-containing aqueous solution having a reduced amount of metal impurities is provided. A method for producing an indium-containing aqueous solution having a reduced...
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6838004 |
Nanopore reactive adsorbents for the high-efficiency removal of waste species
A nanoporous reactive adsorbent incorporates a relatively small number of relatively larger reactant, e.g., metal, enzyme, etc., particles ( 10 ) forming a discontinuous or continuous phase...
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6673969 |
Process for preparation of oximes and resulting products
A new oxime mixture used as an extractant for metals, prepared from natural products containing alkylated phenols such as cashew nut shell liquid using mild reaction conditions, is expressed by the...
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6267936 |
Method for effecting solvent extraction of metal ions using hydrocarbon soluble aminomethylene phosphonic acid compounds
Solvent extraction of one or more metal ions from an aqueous solution in the presence of hydrocarbon-soluble aminomethylenephosphonic acid derivatives.
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6241893 |
Water filtration media, apparatus and processes
An amorphous potassium aluminosilicate filtration media which may be mixed with activated carbon filters water to remove oxygen, chlorines, hardness, alkalinity, ammonia, hydrogen, hydrogen...
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6217622 |
Method and apparatus for precipitating and classifying solids in high concentrations
A method of forming and classifying a precipitate containing large, coarse and fine particles from a super-saturated precipitating mother slurry, e.g. sodium aluminate from the Bayer process. The...
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RE36990 |
Chemical process for the recovery of metal from an organic complex
A method for the recovery of a metal from an organic complex thereof, said method comprising treating the complex with a weakly acid aqueous solution of an alkali metal, an alkaline earth metal or...
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5917069 |
Adsorbent for treatment of oils and/or fats
An adsorbent is described based on an inorganic support material with exchangeable mono- and divalent cations, characterized by the fact that the specific surface of the support material is >100...
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RE36118 |
Chemical process of separating metals from an organic complex
A method for the recovery of a metal from an organic complex thereof, said method comprising treating the complex with a weakly acid aqueous solution of an alkali metal or alkaline earth metal...
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5758255 |
Opposite phase entrainment reduction in solvent extraction/electrowinning circuits by addition of water soluble cationic polymers
A method of reducing the entrainment of aqueous mineral acid solutions in organic extractants used in the solvent extraction of metals from the aqueous fluid is disclosed. The method comprises...
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5682593 |
Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate
Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.
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5678242 |
Membrane extraction with thermodynamically unstable diphosphonic acid derivatives
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and...
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5443732 |
Boron isotope separation using continuous ion exchange chromatography
This invention relates to a process of and apparatus for the continuous and selective separation of boron-10 (B 10 ) isotope having high neutron capture cross-section from boron-11 (B 10 ) isotope...
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5429887 |
Process for treating AB.sub.5 nickel-metal hydride battery scrap
A process for treating an AB 5 Ni--MH battery to recover purified positive and negative electrode components of the battery is disclosed. An AB 5 Ni--MH battery is placed in a mineral acid leach...
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5424050 |
Process for extracting gallium from bayer liquors using an impregnated absorbent resin
The invention also relates to a method of recovering the gallium contained in an aqueous solution of strongly alkaline sodium aluminate by chemical exchange between a stationary phase consisting of...
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5344567 |
Recovery of indium by solvent extraction using trialkylphosphine oxides
This invention relates to a process for the recovery of indium from aqueous acid solutions. More particularly, it concerns the use of a combination of a dialkyl phosphoric acid and a mixture of...
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5332531 |
Extracting metal ions with diphosphonic acid, or derivative thereof
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and...
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5316683 |
Metal extraction by ion exchange
Process for extracting Ge, Ga, In, As, Sb, Bi, Pt, Pd, Ni, and/or Co from an acid aqueous solution, wherein use is made of a resin with 8-hydroxyquinoline groups, resulting from the reaction of an...
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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...
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5296204 |
Thallium extraction process
The invention relates to a process for extracting thallium present especially in aqueous wastes of industrial origin. The process, which makes it possible to extract and recover thallium from a...
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5277883 |
Recovery of metal values from aqueous solutions
A process is described for recovering metal values, e.g., gallium, contained in an aqueous solution by extraction comprising the steps of contacting the aqueous solution with a water immiscible...
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5260039 |
Process for the two-phase extraction of metal ions from phases containing solid metal oxides, agents and the use thereof
A process is disclosed for the two-phase extraction of metal ions from phases containing solid metal oxides, which is characterized in that the solid metal oxides are brought into contact with a...
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5221525 |
Solvent extraction of gallium from acidic solutions containing phosphorus
A process for extracting gallium from an aqueous gallium-bearing acidic solution comprises: a) providing a quantity of phosphorus within the aqueous gallium-bearing solution, the phosphorus being...
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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...
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5190735 |
Recovery of germanium-68 from irradiated targets
A process for selective separation of germanium-68 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a...
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5174917 |
Compositions containing n-ethyl hydroxamic acid chelants
N-ethyl hydroxamic acids, preferably containing at least 10 carbon atoms, useful as metal chelants for use in organic solvent extractant solutions such as kerosene to extract metals from aqueous...
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5167938 |
Process for strontium-82 separation
A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets comprises dissolving the molybdenum target in a hydrogen peroxide solution to form a...
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5122241 |
Process for the hydrometallurgical treatment of a solution of materials containing gallium
A process of hydrometallurgical treatment of a solution of materials containing gallium and at least one metalloid from Group V of the periodic table of the elements which comprises adding...
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5102512 |
Process for extracting and purifying gallium from bayer liquors
A process for extracting and purifying the gallium contained in an industrial solution of sodium aluminate by fixing the gallium on a stationary phase constituted by porous polystyrene adsorbent...
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5093092 |
Purification of bayer process liquor with alumina coated with a layer or carbon
An economical process for the removal and destruction of organic impurities present in Bayer process liquor depends upon the use of a hybrid adsorbent. The hybrid adsorbent consists essentially of...
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5093091 |
Method of removing iron from concentrated alum solutions
Iron is removed from concentrated alum solutions by contacting said solutions with a polymer containing hydroxamic acid or salt groups.
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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...
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5061461 |
Cationic processing of kaolin ores
A method for recovering a fine particle size fraction of a negatively charged mineral from an ore, such as a kaolin clay crude, which comprises forming an aqueous pulp of the ore, dispersing the...
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5059567 |
Process for the preparation of a modified zeolite
Zeolite Y comprising aluminum ions supplied and fixed by ion-exchange is produced by subjecting zeolite NaY to a series of treatment steps comprising e.g. ammonium ion-exchange and calcination. In...
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5030427 |
Gallium purification
Gallium is purified by washing organic solutions containing hydroxamic acid complexes of gallium with aqueous solutions, individually or in series, especially amine or ammonia solutions, and dilute...
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5024821 |
Solvent extraction process
A metal extraction process in which an aqueous leach solution containing metal values is contacted with a solution, in a water-immiscible organic solvent, of an extracting agent where the aqueous...
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5019363 |
Process for hydrometallurgical treatment of an indium chloride solution
A process for the hydrometallurgical treatment of an indium chloride solution and at least one element selected from the group consisting of tin and antimony comprises the following steps: a)...
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5008016 |
Liquid/liquid extraction of gallium values from basic aqueous solutions thereof
Gallium values are separated and recovered from basic aqueous solutions thereof, e.g., Bayer process aluminate liquors, by liquid/liquid extracting such a basic aqueous solution with an organic...
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4999171 |
Process for recovery of gallium by chelate resin
A process for recovery of gallium from aqueous solution containing gallium by adsorbing gallium to a chelate resin is disclosed. According to this process, the aqueous solution containing gallium...
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4999170 |
Method for removing sodium oxalate from caustic aluminate liquors
A method for removing sodium oxalate from a caustic aluminate liquor produced using the Bayer process is disclosed which includes the steps of initially washing all the product aluminum...
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4966761 |
Process for treatment of flyash
A process is described for recovering vanadium and zeolitic alumino-silicates from flyash and similar carbon-bearing heat treated materials. The process includes steps for the separation of carbon,...
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4965054 |
Process of extraction of gallium from aqueous solutions thereof
An improved process of extraction of gallium from aqueous solutions thereof to provide for recovery of the gallium in a very pure form, either as the metal or as the hydroxide. The process involves...
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4959268 |
Polymer containing amorphous aluminosilicate particles and process for producing the same
A polymer which contains amorphous aluminosilicate particles holding metal ions having a bactericidal action is physically stable and enables an ideal antibacterial or bactericidal action by the...
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4956159 |
Process for recovering gallium trichloride from gallium-containing waste
Gallium-containing waste is chlorinated in the presence of gallium trichloride from the beginning. By this procedure, gallium is more efficiently chlorinated and gallium trichloride is more easily...
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4943420 |
Process for recovering gallium
In the process for recovering gallium from aqueous, alkaline solutions by adsorption of the gallium on to bead-polymerized synthetic resins impregnated with 8-hydroxyquinolines and elution thereof...
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4942023 |
Metal extraction process with substituted 8-hydroxyquinoline
A process using an extractant, that consists on the one hand of an active component being substituted 8-hydroxyquinoline and on the other hand of by-products of the manufacture of said extractant,...
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