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7635396 |
Process for separating zirconium and hafnium
The present invention provides a new process for separating zirconium and hafnium compounds, in particular to remove traces of zirconium compounds from hafnium compounds, using fractional...
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5711146 |
Hydrogen peroxide decomposition
A method for decomposing hydrogen peroxide which comprises contacting the hydrogen peroxide with a catalyst having a surface consisting of a mixture of ruthenium with at least one metal of the...
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5545394 |
Complexation-mediated crystal-forming reactions using complexing agents
Methods and reaction systems are disclosed that are adapted for forming crystallites having novel crystal habits and/or morphologies compared to conventional crystallites of the same chemical...
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5505924 |
Multistage countercurrent recrystallization process and apparatus for performing same
A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one...
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5360602 |
Silver nitrate produced by a continuous evaporative crystallization process
Silver nitrate crystals comprising a substantially non-platelet crystal morphology are disclosed. The non-platelet silver nitrate crystals have an aspect ratio in the range of from about 1:2:3 to...
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4880495 |
Regeneration of copper etch bath
This invention relates to a copper etching process which involves contacting the copper with an aqueous etching solution comprising sulfuric acid and a peroxide to which is added less than about...
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4737351 |
Process for the recovery of tin
A process is described for recovering tin from oxide or oxide/sulphide low-grade starting materials and concentrates containing little or relatively low concentrations of tin, in which such...
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4582697 |
Production of aluminum trihydroxide having median diameter of 2 to 100 microns
A process for the production of aluminum trihydroxide having controlled median diameter of 2 to 100 microns, with a unimodal distribution and minimum deviation, by decomposing a hot supersaturated...
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4568352 |
Alkali metal nitrate purification
A process is disclosed for removing contaminants from impure alkali metal nitrates containing them. The process comprises heating the impure alkali metal nitrates in solution form or molten form at...
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4533572 |
Process for producing varnish-bonded carbon-coated metal granules
A process is provided wherein metal granules coated with a polymerizable oil are heated, while being mechanically mixed, to a polymerizing temperature to convert the oil coating to a varnish and...
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4352786 |
Treatment of copper refinery anode slime
A process for the removal of lead content in anode slime by subjecting the latter to primary and secondary leach in a medium of an ammonium acetate solution at a temperature not exceeding 80° C....
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4306880 |
Recovering by-products from sea water brines and the like
The improved production of sodium sulfate, potassium sulfate and other valuable salts from salt plant bitterns or the like wherein initial reduction in sulfate ion concentration yields salt cake...
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4256463 |
Preparation of zirconium oxychloride
A method of crystallizing zirconium or hafnium oxychloride to remove metallic impurities and phosphorus by maintaining the normality of the mother liquor in which the zirconium or hafnium...
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4244924 |
Dual temperature concentration system
In a dual temperature isotope exchange system--exemplified by exchange of deuterium and protium between water and hydrogen sulfide gas in hot and cold towers, in which the feed stream (water)...
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4209330 |
Method for forming clusters of noble metal silver precipitating nuclei
Clusters or galaxies of noble metal silver-precipitating nuclei for use in silver diffusion transfer processes are formed by reducing a noble metal salt or complex to form a colloid of noble metal...
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4197157 |
Method for forming refractory tubing
Refractory tubings, either in amorphous, polycrystalline or single crystal form, are made by moving a preformed tubing of a refractory material and a heated zone relative to each other, the heating...
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4171344 |
Crystal growth from solution
Crystals are grown from solution by the introduction of a first fluid into a second fluid by permeation through a porous partition. Introduction of the first fluid produces supersaturation of the...
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4128589 |
Generation of CF.sub.4 from Teflon for reactive atmosphere processing and growth of metal fluorides
A tetrafluoromethane (CF 4 ) generator and process is disclosed that facilitates the relatively low temperature production of CF 4 gas via controlled decomposition of polytetrafluoroethylene...
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4030964 |
Temperature cycling vapor deposition HgI.sub.2 crystal growth
A method and horizontal furnace for vapor phase growth of HgI 2 crystals which utilizes controlled axial and radial airflow to maintain the desired temperature gradients. The ampoule containing...
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4019950 |
Crystals and their manufacture
In a hydrothermal process for manufacturing crystals of metal carbonates, including single crystals of lead carbonate of the cerussite crystalline form, the nutrient material consists of a...
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4001127 |
Process of preparing single crystals of strontium barium niobate
In a process of preparing single crystals of strontium barium niobate of the type wherein melt of a mixture of strontium oxide, barium oxide and niobium pentoxide is prepared and a single crystal...
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3981818 |
Crystalline materials
A composition of matter transparent to infrared rays and shock resistant which is a directionally grown, polycrystalline solidified melt of a eutectic composition comprising at least two components...
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3973917 |
Method for the purification of selenium by precipitation from a melt
The present invention relates to a method and apparatus for purifying selenium or its alloys by precipitation. The method is characterized in that a smaller portion of a larger amount selenium or...
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3972711 |
Cuprous chloride recovery process
A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and at least one metal chloride compatible with the solubility of cuprous chloride, the process...
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3972689 |
Method for vapor growing crystals
A method and a device for vapor growing crystals. The crystals are grown in an evacuated ampoule from a liquified sample source material, such that the source material is separated from the growing...
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3969182 |
Growth of mercuric iodide single crystals from dimethylsulfoxide
Dimethylsulfoxide is used as a solvent for the growth of red mercuric iodide (HgI 2 ) crystals for use in radiation detectors. The hygroscopic property of the solvent allows controlled amounts of...
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3962027 |
Bi.sub.4 Ti.sub.3 O.sub.12 Single crystal growth from saturated seeded solution
Method of growing single crystal of Bi 4 Ti 3 O 12 by a top-seeded growth technique. A solution of TiO 2 is a solvent consisting of Bi 2 O 3 with/without B 2 O 3 is prepared. The...
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3941648 |
Crystal growth on Hg.sub.3 TeO.sub.6
Single crystals of Hg 3 TeO 6 , which are useful in, for example, acousto-optic applications, are grown on rotating seed crystals in aqueous solution at an elevated temperature. A two-step process...
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3939252 |
Dilithium heptamolybdotetragadolinate
Dilithium heptamolybdotetragadolinate, Li 2 Gd 4 (MoO 4 ) 7 , is disclosed, along with three methods to prepare it. Two of the three methods are useful for growing single crystals of the...
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3933972 |
Process for preparing pure sodium bichromate
Processes for preparing vanadium- and chlorine-free sodium bichromate which comprises concentration of a sodium chromate liquor so as to cause formation of crystals of neutral sodium chromate...
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3929443 |
Method for curing fissures and the like of workpieces formed of metal oxide materials and processed under high material stress
A method for curing fissures and cracks or the like at workpieces formed of metal oxide materials and processed under high material stress, wherein the workpieces are heated in a furnace to a...
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3929415 |
ε-Aluminum fluoride by evaporating aqueous MF solution of AlF3
Process for hydrofluorinating acetylene which comprises reacting acetylene with hydrogen fluoride in the vapor phase and in the presence of ε-aluminum fluoride at a temperature from about 200° to...
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3925147 |
Preparation of monocrystalline lead tin telluride
Large bulk single crystals of lead tin telluride are synthesized by first mixing desired amounts of lead, tin and tellurium with, if desired, bismuth and reacting the mixture at 950°C to form a...
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3923467 |
Production of ultra fine refractory particles from refractory material using plasma flows and a fluidized bed
The device is especially adapted to the partial vaporisation of powdered refractory materials and comprises a vertical enclosure with an exhaust opening to the outside in its upper portion. In its...
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3917462 |
Method of producing sodium beta-alumina single crystals
Single crystals of sodium beta alumina are produced from a melt containing NaO and Al 2 O 3 in a gaseous environment containing from about 5,000 to 10,000 parts per million oxygen.
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3888634 |
Process for preparation of a film of lead monoxide
This invention provides a process for the preparation of lead monoxide comprising subjecting lead monoxide to the vacuum evaporation in the presence of silicon dioxide. According to this process,...
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3887693 |
Continuous process for obtaining aluminium fluoride by reacting fluosilicic acid with an aluminous material
The present invention relates to a continuous process for preparing aluminium fluoride by reacting fluosilicic acid (substantially pure) obtained from superphosphate, phosphoric acid or...
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3885921 |
Preparing purified macromolecular soluble prussian blue
Intensely colored inorganic macromolecular complex compounds or the solution thereof for use in determining the void volume (Vo) of the gel column are provided by a process wherein the crude...
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3883313 |
MODIFIED CZOCHRALSKI-GROWN MAGNESIUM ALUMINATE SPINEL AND METHOD OF MAKING SAME
A modified, Czochralski-grown, single-crystalline spinel has a nominal composition (MgO)(Al 2 O 3 ) x , where x can be between 1 and 2.3. The spinel has an (OH) ion content in its lattice that is...
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3877883 |
Method of growing single crystals of compounds
In growing a single crystal of a compound or an alloy composed of a plurality of compounds, having a volatile element, from a melt of the compound in a sealed ampoule, a quantity of the volatile...
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3878293 |
Process for the production of finely powdered aluminum trichloride of uniform particle size
Process for the production of aluminum trichloride from aluminium trichloride vapour which essentially comprises contacting in a sublimate precipitator the hot stream of aluminium trichloride...
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3873463 |
METHOD OF AND DEVICE FOR MANUFACTURING SUBSTITUTED SINGLE CRYSTALS
The crystal growth is carried out in a crucible which is rotatable about its horizontal axis. Initially, the melt is not in contact with an extra quantity to be added of the components of the...
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3872222 |
Process for producing metal sulphide crystals
Single isometric metal sulphide crystals suitable for use as semiconductors, phosphorus electroluminescents and radiation detectors and a method of forming them comprising crystallizing the metal...
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3868228 |
METHOD OF GROWING CRYSTALLINE BODIES FROM THE MELT
The invention is an improved method for producing mono-crystalline bodies of alumina (or other materials) that are characterized by varying cross-sections, for example, a sapphire tube having an...
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3857922 |
STABILIZATION OF LIGHT METAL HYDRIDE
1. A crystalline, substantially non-ether solvated aluminum hydride having at least about .01 weight per cent magnesium incorporated into the crystal lattice thereof.
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3846322 |
METHOD OF PRODUCING LARGE SINGLE CRYSTALS OF MIXED FERRITES
The present invention relates to a method for producing a large single crystal of a mixed ferrite containing ZnO and having a spinel structure by melting the raw materials under an oxygen...
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3845801 |
HOMOGENIZED PARTICULATE MATTER FOR SPRAY DRYING
An aqueous suspension, slurry, or paste of particulate matter, intended for spray drying to produce a substantially moisture-free product, is initially passed across an orifice plate at a pressure...
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3840347 |
METHOD OF PRODUCING CD[HG (SCN) 4] SINGLE CRYSTALS
Large Cd [Hg (SCN) 4 ] single crystals are produced by crystallizing Cd [Hg (SCN) 4 ] from a super-saturated solution thereof in solvent comprising a mixture of water and alcohol (for example,...
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3838980 |
PRECIPITATION OF BAYER ALUMINA TRIHYDRATE SUITABLE FOR THE MANUFACTURE OF CERAMIC GRADE ALUMINA OF IMPROVED GRINDABILITY
Alpha alumina characterized by monocrystals of a small size, e.g. smaller than 5 microns, is produced from alumina trihydrate precipitated from pregnant Bayer solution by adding thereto alumina...
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3819335 |
PREPARATION OF MACROCRYSTALLINE, HEXAGONAL ALUMINUM HYDRIDE
An improved process for preparing macrocrystalline, substantially non-ether solvated aluminum hydride wherein an aluminum hydride feed material is carried in a liquid of about the same composition...
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