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7537741 |
Gold and silver recovery from polymetallic sulfides by treatment with halogens
A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper,...
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7485267 |
Process for metals recovery from spent catalyst
The process of this invention is directed to the removal of metals from an unsupported spent catalyst. The catalyst is subjected to leaching reactions. Vanadium is removed as a precipitate, while a...
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7318914 |
Chromium removal from leach liquors produced during high pressure acid leaching of lateritic ores
A method is provided for the removal of chromium from leach liquors produced during high pressure leaching of laterite ores in an autoclave, by addition to the autoclave of carbon in a quantity of...
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7261820 |
Method for decreasing a concentration of metal in aqueous solution
A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least...
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7255795 |
Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium
Process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than (200) mg/l, together with vanadium characterized in that it comprises the following steps:...
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7247282 |
Method for the removal of metals from an aqueous solution using lime precipitation
The invention relates to a method for the removal of metals from their aqueous solution with lime precipitation, in conditions where a precipitate of metal hydroxide and gypsum is formed, which...
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7217366 |
Purification of ammonium metallate solutions
A process for reducing the content of alkali metal impurities (e.g., potassium) in ammonium metallate solutions is described. The process involves subjecting a feed solution containing ammonium...
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7169371 |
Process for the treatment of molybdenum concentrate
A method of treatment or purification of a molybdenum concentrate also containing copper, comprises the step of subjecting the molybdenum concentrate to pressure oxidation in the presence of oxygen...
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7160526 |
Process for detoxification of CCA-treated wood
A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating...
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7157072 |
Cathode composition for lithium batteries and method of preparing the same
Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li (1-x)/3 Cr x Ti (2/3)y Mn 2(1-x-y)/3 ]O 2 where...
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7132093 |
Mesoporous mixed oxide materials as a new class of SO2 resistant catalysts for hydrocarbon oxidation
The oxide materials are of the class of ternary mesoporous mixed oxide materials including lanthanum, a metal M selected from the group consisting of Cr, Mn, Fe, Co, Ni, Cu and Zn, and zirconium or...
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7122168 |
Shape anisotropic metal oxide nanoparticles and synthetic method thereof
In a metal oxide nanoparticle and a synthetic method thereof, and in particular to maghemite (γ-Fe 2 O 3 ) nanoparticles usable as a superhigh density magnetic recording substance by having good...
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6833124 |
Recovery process for wastes containing hexavalent chromium
A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent...
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6833123 |
Method for liquid chromate ion and oxy-metal ions removal and stabilization
A method for removing at least one of chromate and other oxy-metal ions from liquid solutions includes contacting the liquid solution with solid barium compounds as adsorbents so that the at least...
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6800260 |
Processes for treating iron-containing waste streams
Processes for treating iron containing waste streams are provided. According to these processes, metal-containing compounds, particularly iron oxides are produced. These methods may, for example,...
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6653066 |
Device and method for detecting polyvalent substances
Disclosed is a device and method of use for detecting polyvalent analytes such as antibody to the AIDS virus, utilizing an inverse sandwich method. The test device comprises a first substance...
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6645458 |
Method for making an aqueous sodium chloride solution
Process for the manufacture of an aqueous sodium chloride solution, according to which a solid material comprising sodium chloride and heavy metals is dispersed in water, the aqueous medium thus...
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6485629 |
Process for separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant
A process for separating a first source of a heavy metal ion or mixtures of heavy metal ions, (Me 1 ), from a solution comprising a complex of said Me 1 and EDDS, (Me 1 -EDDS), by displacement of...
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6328938 |
Manufacture of titanium dioxide with recycle of waste metal chloride stream
A method for the integration of a manufacturing facility with a salt dome, which manufacturing facility is one for the production of high purity titanium dioxide using chlorine as a reactant. The...
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6149883 |
Pressure oxidation process for the production of molybdenum trioxide from molybdenite
Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble...
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RE36915 |
Process for sodium sulfide/ferrous sulfate treatment of hexavalent chromium and other heavy metals
A process for treating industrial waste water containing hexavalent chromium (Cr +6 ) and other heavy metals is disclosed which comprises reduction of Cr +6 to trivalent chromium (Cr +3 ) and the...
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6113868 |
Process for treating tungstate solutions to reduce molybdenum impurity and other impurity content
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5980749 |
Inclusion methods for purifying a solvent
Disclosed are methods for purifying solvents, by causing contaminants to be included within layers of dispersed layered materials, and then separating the restacked combined contaminant/layered...
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5961879 |
Process for the manufacture of hypochlorite bleaching compositions
The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising hypochlorite, a strong source of alkalinity and water, said process comprising the...
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5928559 |
Process for the manufacture of hypochlorite bleaching compositions
The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising alkali metal hypochlorite, a strong source of alkalinity and water; said process...
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5820844 |
Method for the production of a purified MoO.sub.3 composition
A method for producing purified MoO 3 from MoS 2 . MoS 2 is initially oxidized to generate an impure MoO 3 product containing metallic contaminants and molybdenum sub-oxides. This product is...
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5804151 |
Process for autoclaving molybdenum disulfide
A method for producing MoO 3 from MoS 2 . MoS 2 is combined with water to form a slurry which is then combined with at least one oxygen-containing oxidizing gas in a reaction chamber in order to...
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5676817 |
Process for the production of pure solutions of tungsten and molybdenum
Process for the production of pure tungsten and/or molybdenum solutions from sources, such as alkaline decomposition solutions, which are contaminated with tantalum, niobium, titanium, aluminium,...
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5599514 |
Process for recovering cobalt and tungsten from reaction liquors
Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated: a) With an alkali-earth metal hydroxide in order to precipitate cobalt...
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5594929 |
Method of preparing powders for hard materials
According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are...
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5503813 |
Molybdenum recovery from epoxidate
Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric...
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5427692 |
Removal of chromium from solution using ferrous sulfate and barium nitrate
Hexavalent chromium is removed from aqueous sodium nitrate solutions by reacting hexavalent chromium with an aqueous slurry consisting essentially of ferrous hydroxide and barium sulfate whereby...
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5417945 |
Process for recovering tungsten as an ammoniacal tungstate compound in which ammoniacal tungstate liquors are reclaimed
A process for recovering tungsten as an ammoniacal tungstate which comprises reacting a tungsten containing material with sodium hydroxide to produce sodium tungstate and forming a first aqueous...
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5415848 |
Method for removal of hexavalent chromium from a solution
A process for removing chromium from an aqueous electrolyte solution is disclosed. The process involves admixing with the solution an amount of a chromium-reducing compound and an amount of a...
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5407650 |
Process for purifying a technical iron chloride solution by selective precipitation
A process for purifying an acidic technical-grade iron chloride solution formed from cyclone dust from the production of TiO 2 in accordance with the chloride process by adjusting the pH with a...
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5401833 |
Method and apparatus for treating chrome leather waste
An improved method and apparatus for treating chromium containing leather scrap to recover chromium compounds and to produce a protein hydrolysate. The leather scrap is fed into an upstream mixing...
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5397478 |
Fixation and stabilization of chromium in contaminated materials
A highly flexible multi-step treatment technology for chemical fixation and stabilization of leachable chromium, particularly hexavalent chrome, in contaminated soils, solid wastes, concrete,...
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5395601 |
Re-calcination and extraction process for the detoxification and comprehensive utilization of chromic residues
A re-calcination and extraction process for the detoxification and comprehensive utilization of chromic residues, comprising adding small amount of residue ore powder, sodium carbonate, or...
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5393503 |
Process for making chromic acid
Disclosed is an improvement on a process in which sodium chromate is reacted with sulfuric acid to produce sodium bichromate and sodium sulfate, and the sodium bichromate is reacted with sulfuric...
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5380441 |
Removal of chromium from solution using mechanically agitated iron particles
Metallic iron particles are added to an aqueous solution containing hexavalent chromium and mechanically agitated. Enough of the surface of the iron particles remains precipitate-free to reduce...
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5336475 |
Process for chromium removal using an inorganic sulfur compound
A method has been devised for removing chromium ions from a chromium ion containing liquid and recovering chromium oxide in a usable form by (a) adjusting the temperature of the liquid to an...
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5334362 |
Process for the production of disposable products from metal chlorides in a titanium dioxide chloride process
In order to treat metal chlorides obtained in the form of dust collector solids in the production of titanium dioxide by the chloride process, the inert constituents, especially particulate coke,...
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5308501 |
Treatment system for alkaline or acidic solution containing heavy metals
There is disclosed a method of treating a solution, e.g., an alkaline or acidic solution, containing heavy metals ions therein. With respect to alkaline solutions, the method includes providing a...
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5294307 |
Integrated process for the production of alkali and alkaline earth metal chlorates and chlorine dioxide
An integrated process for the production of alkali or alkaline earth metal chlorates and chlorine dioxide in which the chromium compound impurities in the alkali or alkaline earth metal chlorate...
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5282977 |
Separation of heavy metals from waste water of the titanium dioxide industry
For economical and assured separation of chromium, vanadium and titanium ions from acidic waste waters, which accrue in great quantities in preparation of titanium dioxide, the pH is first raised...
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5271912 |
Enzymatic processing of materials containing chromium and protein
Chromium containing protein materials are treated by processes which include the steps of: combining the material to be treated with sufficient water to effect the solubilization of the gelable...
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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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5256306 |
Continuous treatment of chromium bearing waste water
The present invention provides a composition and process for the treatment of waste water containing chromium compound, for example water from a plating operation which includes significant...
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5250274 |
Process for the production of sodium dichromate
The invention relates to a process for the production of sodium dichromate and sodium dichromate solutions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace...
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5229086 |
Removal of molybdenum from uranium-bearing solutions
A process for removing molybdenum from uranium bearing solutions reduces molybdenum contamination of uranium product. The process employs solvent extraction techniques to remove molybdenum by using...
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