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7846404 |
Process for separating and recovering base metals from used hydroprocessing catalyst
A method is disclosed for separating and recovering base metals from a used hydroprocessing catalyst originating from Group VIB and Group VIII metals and containing at least a Group VB metal. In...
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7837960 |
Process for separating and recovering base metals from used hydroprocessing catalyst
A method is disclosed for separating and recovering base metals from a used hydroprocessing catalyst originating from Group VIB and Group VIII metals and containing at least a Group VB metal. In...
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7794677 |
Reduction of copper content in the molybdenite concentrate
Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric...
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7736607 |
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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7658895 |
Process for recovering base metals from spent hydroprocessing catalyst
A method for recovering metals from a spent dispersed catalyst originating from a Group VIB metal sulfide catalyst containing at least a Group VB and Group VIII metal for hydrocarbon oil...
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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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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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7182926 |
Process for separating and recovering valuable metals
A process for economically separating and recovering valuable metal components, with few kinds of chemicals being used, with no waste water that causes environmental pollution being discharged, and...
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6730279 |
Production of pure molybdenum oxide from low grade molybdeniteconcentrates
High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete...
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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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6180072 |
Process to recover metals from spent catalyst
There is provided a process to reclaim metals from catalysts, said process comprising collecting one or more catalyst containing at least one metal sulfide; leaching the catalyst in an atmospheric...
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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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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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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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5300274 |
Method for making molybdenum and sulfur containing compounds
A method for preparing molybdenum and sulfur containing compounds of the general formula X2 Mo2 S12.yH2 O, where X is a cation selected from the group consisting of Na+, K+, R4 N+, R3 NH+, R2 NH2+,...
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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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5264191 |
Quaternary ammonium trihalide and method for dissolution of metal with liquid containing the compound
A quaternary ammonium trihalide, a novel compound, represented by the formula: [A--R']+ X3-(wherein A stands for a trialkyl-amino radical or a pyridyl radical, R' for an alkyl radical of 6 to 22 c...
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5101052 |
Molybdenum recovery
An epoxidation reaction product formed by the molybdenum catalyzed reaction of propylene with tertiary butyl hydroperoxide to provide propylene oxide and tertiary butyl alcohol is separated by...
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5093509 |
Removal of trace quantities of molybdenum
An epoxidation reaction product formed by the molybdenum catalyzed reaction of propylene with tertiary butyl hydroperoxide to provide propylene oxide and tertiary butyl alcohol is separated by...
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5002740 |
Process for purifying molybdenum
A process is disclosed for purifying molybdenum containing arsenic and phosphorus which involves leaching molybdenum trioxide in an acid at a temperature of above about 70° C. to remove impurities ...
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4963336 |
Purification of APT
Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium...
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4956154 |
Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions
Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively...
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4942024 |
Method for refining hydroxides of niobium and tantalum containing transition metals
Refining of either niobium hydroxide or tantalum hydroxide containing transition metals as impurities is accomplished easily and economically by dissolving the metal hydroxide in an aqueous...
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4933152 |
Continuous process for purifying molybdenum
A process for purifying molybdenum, which comprises first leaching impure molybdenum trioxide containing potassium in a liquid medium of nitric acid, and an ammoniacal liquor, wherein the nitric...
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4910000 |
Method of extracting tungsten values from tungsten containing ores
A method of extracting tungsten values from tungsten containing ores comprising step (i) forming a mixture of a tungsten containing ore and a first mineral acid adapted to consume acid consuming...
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4872909 |
Process for acid leaching of manganese oxide ores aided by hydrogen peroxide
A method of processing manganese ore by adding the ore to an aqueous solution of acid and H2 O2 to form a leach pulp. The leach pulp is agitated for a predetermined time period at predetermined...
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4814149 |
Process for recovering molybdenum from solution in a form that is substantially free from vanadium
The present invention is a process for selectively precipitating molybdenum in a form that is substantially free from vanadium impurities. The molybdenum is precipitated in the form of ammonium...
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4804528 |
Stripping and recovery of dichromate in electrolytic chlorate systems
A process for removing dichromates from chlorate-rich solutions containing hypochlorite and dichromate ions and produced by the electrolysis of brine. The dichromate is reduced in a two-stage...
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4762812 |
Heavy oil hydroprocess including recovery of molybdenum catalyst
A process for the recovery of a spent molybdenum catalyst from a hydroprocess for the upgrading of a nickel and vanadium containing hydrocarbonaceous mineral oil. The nickel and vanadium...
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4741886 |
Process for recovering tungsten from tungsten bearing material containing arsenic
A process is disclosed for recovering tungsten from tungsten bearing material containing arsenic. The process involves adjusting a water slurry of the material to a pH of less than about 4 with an...
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4735791 |
Process for producing ammonium molybdate from molybdenum trioxide
A process is disclosed for producing ammonium molybdate from molybdenum trioxide which involves digesting molybdenum trioxide with ammonia in a sealed vessel equipped with one or more stirrers at a...
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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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4654131 |
Recovery of tungsten valves from alkaline solutions
A method of removing sodium ions from an alkaline aqueous solution such as a leach solution which contains dissolved sodium tungstate. The method involves passing the solutions through the anode...
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4612172 |
Purification of molybdenum
A process is disclosed for removing potassium from a relatively impure molybdenum trioxide and forming a molybdenum compound of high purity. The process involves first contacting the impure...
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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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4587109 |
Process for the separate recovery of molybdenum and vanadium
The invention relates to a process for recovering and purifying the molybdenum from a solution containing more molybdenum than vanadium.The process of the invention comprises the step of contacting...
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4554138 |
Leaching metals from spent hydroprocessing catalysts with ammonium sulfate
A process for enhancing recovery of metals, especially cobalt, from spent hydroprocessing catalysts when the spent catalyst particles are first roasted at between 400° C. and 600° C. and then c...
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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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4542121 |
Catalysts from molybdenum polysulfide precursors, their preparation and use
A process for the preparation of novel highly active, highly selective hydrotreating catalysts. These catalysts are prepared, in bulk or in supported form, from a catalyst precursor characterized...
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4478698 |
Process for recovering copper and molybdenum from low grade copper concentrates
Low grade copper concentrates containing molybdenum are roasted under conditions to form copper and molybdenum compounds which are soluble in dilute sulfuric acid solutions.Molybdenum is then...
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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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4417997 |
Method for recovery of metals from spent iron-chrome shift catalyst and method of forming new catalyst
The Abstract of the Invention is a method of making a solution of the nitrates of iron and chromium from a spent catalyst containing oxides of iron and chromium, which method comprises: (a)...
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4407781 |
Method of separating molybdenum from uranium
A method is disclosed for separating uranium from molybdenum in an aqueous solution. The pH of the solution is lowered to about 1 to about 4 using an inorganic acid such as hydrochloric acid. The...
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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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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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4374100 |
Recovery and recycle of molybdenum values from coal liquefaction residue
The residue from a Mo-catalyzed coal liquefaction process is treated to recover the Mo in a form in which the Mo can easily be recycled and reused as a catalyst for coal liquefaction. The process...
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4346061 |
Purification of ammonium tungstate solutions
Prior to evaporative crystallization of ammonium tungstate solutions to give ammonium paratungstate (APT), an aluminum compound, e.g. aluminum sulfate solution, is added to precipitate silicon and...
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4344924 |
Solvent extraction of chromium and vanadium
Chromium and vanadium can be co-extracted from alkaline solutions or leach liquors containing these metals using quaternary amine solvent mixtures. The alkaline leach liquors usually are derived by...
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4320094 |
Partitioning of refractory metals from oxidation resistant scrap alloy
Alloy scrap containing refractory metals such as chromium, molybdenum, tungsten, vanadium, niobium and tantalum and base metals such as nickel, cobalt, copper and iron are treated to partition the...
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4307065 |
Rapid and efficient recovery of molybdenum from spent mandrel dissolving acid solution
For rapid and efficient recovery of dissolved molybdenum from spent acid, the spent acid solution is first diluted to a predetermined acid-water volume ratio and anhydrous ammonia added thereto to...
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