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8062620 |
Catalytic process for the conversion of Co (II)hydroxide in Co (III)oxidehydroxide
The present invention relates to a process for the conversion of cobalt(II)hydroxide into cobalt(III)oxidehydroxide (CoOOH) by reaction of the cobalt(II)hydroxide with oxygen in the presence of...
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8057763 |
Process for recovering group VIB metals from a catalyst
The invention relates to a process for recovering Group VIB metals from a catalyst, in particular a spent bulk catalyst, comprising one or more Group VIB metals and one or more Group VIII metals....
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7968066 |
Method for production of alkali metal chromates
This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal...
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7824633 |
System and method for conversion of molybdenite to one or more molybdenum oxides
A system and method for producing molybdenum oxide(s) from molybdenum sulfide are disclosed. The system includes a pressure leach vessel, a solid-liquid separation stage coupled to the pressure...
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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)/3CrxTi(2/3)yMn2(1-x-y)/3]O2 where...
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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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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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6352571 |
Method of making metal composite materials
One or more metal salts of at least one iron group metal containing organic groups are dissolved in at least one polar solvent and complex bound with at least one complex former comprising...
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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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5858324 |
Lithium based compounds useful as electrodes and method for preparing same
A process for preparing a compound that includes the steps of: (a) preparing a solution comprising (i) a chromium source, (ii) a manganese source, (iii) a lithium source, and (iv) an oxygen source,...
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5820844 |
Method for the production of a purified MoO3 composition
A method for producing purified MoO3 from MoS2. MoS2 is initially oxidized to generate an impure MoO3 product containing metallic contaminants and molybdenum sub-oxides. This product is then...
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5804151 |
Process for autoclaving molybdenum disulfide
A method for producing MoO3 from MoS2. MoS2 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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5788938 |
Recovery of tungsten from ferrotungsten
A method is provided whereby tungsten values are recovered from ferrotungsten by completely oxidizing the ferrotungsten at high temperatures in an oxygen atmosphere followed by digestion with...
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5776848 |
Molybdenum epoxidation catalyst recovery
An aqueous epoxidation process stream containing molybdenum and sodium values is incinerated and an aqueous solution containing molybdenum and sodium is recovered, acidified and reacted with a...
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5743197 |
Grate assembly for a fluidized bed boiler
A grate assembly for a fluidized bed boiler comprises a number of parallel sparge pipes or the like extending side-by-side in a substantially horizontal plane and provided with elements for...
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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 and...
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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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5571489 |
Process for chromium recovery from aqueous solutions
A process for recovery of chromium in an aqueous solution comprising converting the chromium to chromyl chloride, separating the chromyl chloride from the aqueous solution, either as a heavy...
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5547588 |
Enhanced ettringite formation for the treatment of hazardous liquid waste
A process for treatment of hazardous liquid waste comprising trace amounts of hazardous elements in solution as oxyanions by oxyanion fixation within ettringite and related minerals. In accordance...
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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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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 p...
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5279804 |
Vanadium removal in aqueous streams
Disclosed is a method of removing soluble vanadium from an aqueous stream containing sodium chromate or sodium bichromate. The liquor is passed over a water-insoluble trivalent chromium compound,...
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5273726 |
Removal of aluminum from ammonium molybdate solution
Aluminum is removed from ammonium molybdate solution by the use of Mg+2 in the solution to precipitate out the aluminum.
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5273735 |
Process for the preparation of sodium dichromate
A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to...
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5204073 |
Toxicity elimination and comprehensive utilization of chrome residues
This invention relates to a method for toxicity comprehensive elimination of chrome residues, comprising adding water to chrome residues, wet-grinding the same to a thick liquid, letting it react...
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5082637 |
Removal of potassium from ammonium molybdate
Potassium impurity is removed from ammonium molybdate by dissolving the ammonium molybdate in hot acid, allowing the acid solution to cool whereby the ammonium molybdate precipitates out of the...
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5007960 |
Method for removing chromium from chromium containing waste material
A method is provided for removing chromium from a chromium containing waste material wherein the waste material is dried by indirect heating, sized to a particle size of less than 0.105 mm, mixed...
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4968503 |
Process for the production of sodium dichromate
A process for the production of sodium dichromate comprising reacting sodium chromate with acids, the acids being sulfuric acid and NaHSO4 formed as a waste product in the production of CrO3 and...
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4859431 |
Rhenium generator system and its preparation and use
A process for preparing a tungsten-188/rhenium-188 generator having a tungstate matrix containing W-188 produced by irradiating tungsten-186 in the tungstate compound. High activity, carrier-free...
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4702895 |
Purification of molybdenum
A method is disclosed for purifying molybdenum which involves adding to an ammoniacal ammonium molybdate solution containing the impurities of phosphorus and arsenic with the phosphorus...
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4629503 |
Process for the recovery of tungsten in a pure form from tungsten-containing materials
The present invention relates to a simple process for the recovery of pure tungsten at a high yield from cemented tungsten carbide or tungsten alloys scrap. According to the invention the process...
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4605538 |
Production of pure molybdenum
A process is disclosed for producing pure molybdenum which involves contacting a molybdate solution with a true liquid alkaloid in an amount sufficient to form an alkaloid-molybdenum compound with...
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4604267 |
Process for purifying molybdenum trioxide
Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammonium sulfate, and ammonium nitrate is contacted...
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4552729 |
Method for removing tin from sodium tungstate solution
A method is disclosed for removing tin from aqueous sodium tungstate solutions. The method involves adding ammonia to the sodium tungstate solution, adjusting the pH to above about 9.5 with an...
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4508701 |
Extraction of tungsten from spent or scrap catalyst materials
A spent or scrap tungsten-containing, aluminosilicate catalyst material is blended with a silicate-containing, tungsten-bearing ore concentrate in amounts such that at least about 2.0% by weight of...
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4500350 |
Disintegration of chromites
In the disintegration of a chromite or chromium-containing residue, wherein the chromium-containing material is disintegrated with an alkaline compound in the presence of oxygen and a diluent at a...
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4495157 |
Recovery of metal values from spent hydrodesulfurization catalysts
A process is provided for recovering metal values from spent hydrodesulfurization catalyst, the process comprising forming in a pressure reactor an aqueous slurry of finely divided spent catalyst...
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4490339 |
Process for recovering tungsten from MoS3 /WS3 precipitates
A process is provided for recovering molybdenum and tungsten separately from a sulfide cake containing the same along with arsenic as an impurity. The process comprises dissolving essentially all...
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4482526 |
Recovery of tungsten and molybdenum from sulfur-bearing material
Tungsten and molybdenum are recovered from sulfur bearing material such as sulfide sludges by a pollution free process in which the sulfur bearing material is heated with agitation in an aqueous...
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4464345 |
Method of precipitating contaminants in a uranium leachate using ferri ions, complexing agent, and pH control
The present invention relates to a process for recovery of uranium from a carbonate lixiviant additionally containing other contaminants such as molybdenum and silica, by adjusting the pH of the...
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4448755 |
Method for removal of tin from ammonium tungstates
In a process for producing pure ammonium paratungstate from ammonium tungstate solutions containing tin, sulfide is added to the ammonium tungstate solution in an amount sufficient to form a...
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4442073 |
Separation and recovery of metal alloys from superalloy scrap
A method for recovering superalloy scrap is disclosed. The method involves oxidizing superalloy scrap in an aqueous acidic medium. The aqueous acidic medium has an oxidation potential sufficient to...
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4432947 |
Process for obtaining molybdenum as a useful product from molybdeniferous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and possibly uranium
A process for obtaining molybdenum as a useful product from aqueous solutions to be purified, according to claim 1 of French patent No. 2 404 601, which contain, besides said molybdenum, alkali...
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4423013 |
Process for the purification of solutions containing alkali metal carbonate, sulphate, hydroxide or possibly hydrogen carbonate, and one at least of the metals vanadium, uranium and molybdenum
Process for extracting molybdenum from aqueous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and, primarily, one at least of the metals belonging to the...
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4423009 |
Carbonate, sulphate and hydroxide or hydrogen carbonate
Process for the purification of an aqueous solution containing alkali metal carbonate, sulphate, and hydroxide or hydrogen carbonate and primarily one at least of the metals belonging to the group...
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4405572 |
Recovery of molybdenum
Molybdenum catalyst employed in the epoxidation of an olefin with an organic hydroperoxide preferably the epoxidation of propylene, is recovered from the bottoms fraction by adding aqueous alkaline...
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4397821 |
Precipitation of synthetic scheelite
Synthetic scheelite (calcium tungstate) having a low sulfur content is produced in high yield from an aqueous solution of sodium tungstate, that can be contaminated with sulfate ion dissolved...
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4393028 |
Method of removing uranium from a slurry containing molybdenum
Disclosed is a method of removing uranium from a slurry containing a water-insoluble molybdate and a Group II element, usually calcium. The pH of the slurry is raised with an alkali metal hydroxide...
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4382069 |
Multiple batch recovery of acid dissolved molybdenum
Rapid recovery of molybdenum from an acid solution containing dissolved molybdenum is accomplished by using a multiple batch method. A first batch of ammonium molybdate precipitate is formed by...
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4376099 |
Process for recovering Cr(VI) ions from a chlorate cell liquor
From a chlorate cell liquor containing an alkali metal chlorate, an alkali metal chloride and Cr(VI) ions, Cr(VI) ions are recovered by means of a combination of simple chemical procedures and...
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