Matches 151 - 200 out of 284 < 1 2 3 4 5 6 >
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4647401 Process for preparing colloidal ceric oxide and complexes thereof with free organic acids  
A process is provided for preparing colloidal dispersions of ceric dioxide in inert organic media which comprises (1) heating (a) ceric dioxide comprising ammonium nitrate or ammonium and...
4642177 Process for reducing sulfur oxide emissions from catalytic cracking units  
A sulfur sorbent for use in reducing the emissions of sulfur oxides from regenerators of cyclic catalytic cracking units comprises a rare earth component or mixture of rare earth components in...
4636369 Essentially complete recovery of uranium, yttrium, thorium and rare earth values from phosphate rock during wet-process production of phosphoric acid therefrom  
The uranium, yttrium, thorium and rare earth values contained in a phosphate rock are essentially totally recovered therefrom by, during the wet-process preparation of phosphoric acid from said...
4599201 Process for preparing ceric carboxylates  
A process is provided for preparing ceric carboxylates which comprises oxidizing cerous carboxylate with aqueous hydrogen peroxide in a two-phase system comprising an aqueous phase of hydrogen...
4473488 Process for reclaiming rare-earth metallic oxide and/or rare-earth metallic oxysulfide phosphors  
To a suspension of rare-earth phosphors and sulfidic or selenidic phosphors there is added about 1 to 2% of the amount of hypohalogenite which would be necessary to convert the entire sulfidic or...
4462970 Process for preparation of water-free oxychloride material  
The specification discloses a process for forming a water-free rare earth oxychloride powder by exposing a water-containing rare earth oxide powder to a reactive atmosphere of chlorine and oxygen...
4438078 Recovery of gadolinium and gallium oxides  
A process is described whereby gadolinium and gallium containing by-products can be reprocessed to yield the oxides of these elements in sufficient purity to be re-used in the process for...
4390507 Process for recovering yttrium and lanthanides from wet-process phosphoric acid  
Process for recovering yttrium and lanthanides from wet-process phosphoric acid by adding a flocculant to the phosphoric acid, separating out the resultant precipitate and then recovering yttrium...
4387077 Process for the recovery of substantially radium free calcium sulphate, yttrium and lanthanides, as well as calcium sulphate, yttrium and lanthanides obtained by this process  
Recovery of yttrium, lanthanides and radium free calcium sulphate in a phosphoric acid process by digesting phosphate rock with an excess of phosphoric acid in the presence of more than about 5...
4374805 Reductants for reducing metals in acid media  
Metals such as iron, uranium, vanadium, molybdenum and rare earths are reduced to lower oxidation states in various acid media using silicon metal or an iron-silicon alloy. In particular, ferric...
4315832 Process for increasing laser crystal fluorescence yield by controlled atmosphere processing  
The specification discloses a process for modifying the environment of active atoms in a selected material by removing impurities from the environment. The material is heated at an elevated...
4265862 Process for purifying rare-earth compositions using fractional sulfate precipitation  
A process is disclosed for purifying a composition comprising at least one rare-earth element. The process is useful for removing radioactive impurities from these elements. The process comprises...
4199396 Method for producing single crystal gadolinium gallium garnet  
Method for producing virtually perfect massive unicrystalline gadolinium gallium garnet from a melt of gadolinium and gallium oxides containing an addition of calcium, magnesium or strontium ions.
4198231 Recovery and separation of gadolinium and gallium  
Gallium and gadolinium are recovered and separated from scrap material of substances which contain both of these elements in the form of oxides or compounds which can be transformed to the oxides....
4191727 Method for the separation of a mixture of fine particles  
A method for the separation of a mixture of fine particles wherein the fraction to be separated has a surface which is more reactive chemically than the remaining fractions by grinding the mixture...
4179492 Process for making rare earth metal chlorides  
A process for forming a metal chloride of a metal or its compound comprising forming a liquid fused salt bath mixture of at least two metal chlorides, the bath having the property of dissolving the...
4156661 Method of modifying electrical properties of rare-earth chromite material  
A method of decreasing the electrical resistivity of a rare-earth chromite material by substituting bivalent metal ions for some of the chromium or rare-earth ions therein. The method includes...
4127989 Method for separating metal values from brine  
A process for separating and recovering metal values and salts from brine, such as brine produced from a subterranean geothermal reservoir, in which the brine is pressurized to above the bubble...
4119437 Method for removing Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 cores from castings  
A weakly acid solution of either NH 4 NO 3 , NH 4 Cl, NH 4 HSO 4 , CH 3 COOH or equimolar CH 3 COOH -- CH 3 COONa is employed to remove cores of either Y 2 O 3 or Sm 2 O 3 from castings...
4065544 Finely divided metal oxides and sintered objects therefrom  
Finely-divided metal oxides are prepared by the steps of (a) contacting a compound of a metal with a carbohydrate material to obtain an intimate mixture thereof, (b) igniting this mixture to...
4053551 Methods of recovering terbium oxide from a glass  
A method for recovering Tb 4 O 7 from a glass containing terbium oxide is disclosed, the method including the steps of: I. fusing the glass containing terbium oxide with NaOH to provide a...
4051219 Method of preparing fluorine-free rare earth metal compounds from such compounds containing fluorine  
A rare earth metal salt containing fluorine ions is separated from an acidic solution of the salt in the presence of an amount of boric acid sufficient to sequester the fluorine ions whereby the...
4051230 Liquid-liquid extraction process of metals  
In this process metal ions such as Ag + , Pb 2 +, Co 2 +, Cu 2+, Fe 3 +, etc., are extracted through a porous membrane impregnated with the first extractant containing chelating agents. The...
4041125 Process for separation of the lanthanides  
An improved liquid-liquid extraction process for the separation of the elements of the lanthanide series is disclosed. The process involves dissolving the lanthanides in a sulfuric acid solution to...
4029733 Extraction of metals from sea nodules  
The method comprises the steps of crushing of the ore, neutralization by a mixture of water and sulphuric acid, introduction of a controlled quantity of sulphur dioxide gas at a pH value between...
3965238 Method of recovering uranium  
Uranium values are obtained from phosphate rock by acidifying phosphate rock containing uranium values and at least one other heavy metal with a mineral acid so as to obtain a crude acid, solvent...
3954657 Process for reclaiming rare earth oxysulfide phosphor material  
This disclosure depicts a process for reclaiming from contaminated color cathode ray tube screening waste rare earth oxysulfide phosphors, especially the red-emitting phosphor yttrium oxysulfide....
3947542 Process for treatment of pyrochlore concentrates  
A continuous process for extraction of niobium, rare earths and thorium from niobium ore concentrates which includes digesting the ore with a hot solution containing 13 to 16 moles of sulphuric...
3941714 Process for reclaiming rare earth oxysulfide phosphors  
A process suitable for reclaiming europium-activated yttrium oxysulfide contaminated with europium-activated yttrium oxide and other non-rare earth cathodoluminescent phosphors comprises forming a...
3937783 Recovery of fluorine, uranium and rare earth metal values from phosphoric acid by-product brine raffinate  
A method for recovering substantially all of the fluorine and uranium values and at least 90 percent of the rare earth metal values from brine raffinate obtained as by-product in the production of...
3925062 Process for treatment of ores  
Process for treatment of ores, in particular phosphate ores, comprising treating said ores in powder form at an elevated temperature, within an atmosphere consisting at least partially of a gaseous...
3914373 Method for separating isotopes  
Isotopes are separated by contacting a feed solution containing the isotopes with a cyclic polyether wherein a complex of one isotope is formed with the cyclic polyether, the cyclic polyether...
3912801 Solvent extraction of metals with a cyclic alkylene carbonate  
Cyclic organic carbonates have been found, along with mixtures of same with other organic liquids that are miscible therewith, to extract the following metals in stable complex or simple salt form...
3873473 SULPHIDE SOLID SOLUTION HAVING ROCK-SALT STRUCTURE AND METHOD OF PRODUCING THE SAME  
This invention provides a sulphide solid solution which is expressed by the general formula (Cd, A)S in which A is at least one element selected from the group consisting of Yb, Cr, Mg, Sr, Ca, La,...
3857919 SEPARATING METAL VALUES BY SELECTIVE EXTRACTION  
Double solvent extraction process wherein an aqueous solution of difficult to separate metals is alternately contacted with two different solvents and at least one metal is preferentially extracted...
3853979 METHOD FOR REMOVING RARE EARTHS FROM SPENT MOLTEN METALLIC FLUORIDE SALT MIXTURES  
An improved method for reprocessing spent molten metallic fluoride salt mixtures of rare earths is provided wherein the rear earths are reductively extracted from the spent molten salt which is...
3846328 METHOD FOR SEPARATING SULFIDE PHOSPHOR PARTICLES FROM MIXTURES  
To separate chemically-oxidizable sulfide phosphor particles, such as zinc sulfide and zinc-cadmium sulfide phosphor particles, from a mixture with essentially nonoxidizable phosphor particles,...
3812233 PROCESS FOR SEPARATING CERIUM CONCENTRATE FROM ORES  
A process for separating cerium from the other rare earth values in bastnasite ore by roasting the ore followed by leaching with dilute hydrochlorde acid under carefully controlled conditions.
3791815 PROCESS FOR LANTHANIDE AND ACTINIDE METALS ORE REDUCTION  
The Lanthanide and Actinide series of metals are found mainly in the three ores Monazite, Carnotite, and Uraninite or Pitchblende. In winning these metals from the ores usually the oxides are...
3763050 METHOD OF RECOVERING A RARE EARTH PHOSPHOR  
A method of recovering a rare earth phosphor from a mixture which contains this phosphor and at least one sulphide and/or selenide of zinc and/or cadmium. The mixture is treated in an aqueous...
3763049 PROCESS FOR THE CONTINUOUS RECOVERY OF MATERIALS FROM SEA WATER  
An apparatus and process for the recovery of materials from sea water and brine wherein valuable constituents of sea water and brine, such as ionic substances, are recovered by employing an endless...
3748095 PRODUCTION OF HIGH PURITY RARE EARTH SULFIDES  
Novel method for the production of high purity metal sulfides, selenides, tellurides, and arsenides, particularly those of high melting point greater than 1,000° C, e.g., such compounds of the...
3710342 RECORDER CHART DRIVE  
A recorder of the type for recording one or more records of the value of one or more conditions under measurement such as temperature, pressure, flow or the like upon a strip chart. A pen, pens, a...
3668143 PREPARATION OF PHOSPHORS BY PRECIPITATION FROM SOLUTION  
Inorganic phosphors are prepared by separately introducing the anions and cations to form the phosphor into a reaction solution; maintaining in the reaction solution, throughout the reaction, an...
3647361 TWO-STAGE COUNTERCURRENT LEACHING PROCESS FOR THE RECOVERY OF PHOSPHATES, YTTRIUM AND RARE EARTH VALUES  
Phosphates and yttrium and rare earth metal values are recovered from solid materials, particularly phosphate ores or commercial concentrates and especially apatites, in a two-stage leaching...
3645682 A PROCESS FOR PRODUCING PHOSPHORIC ACID BY THE USE OF ION EXCHANGE RESINS  
The invention relates to an improved method of ion exchange. The inventive concept involves directly contacting a substantially dry ion exchange resin with a substantially dry material which...
3619128 METHOD FOR PROCESSING RARE EARTH FLUOROCARBONATE ORES  
Rare earth fluorocarbonate ore is processed by digesting the ore in concentrated aqueous alkaline solution at a temperature of between about 100° C. and about 150° C. followed by separating the...
3549523 METHOD FOR EXTRACTING SOLID PARTICLES FROM A LIQUID  
3546202 2,7-BISPHENYLAZOCHROMOTROPIC ACID DIAMIDE DERIVATIVES AND METHOD OF PREPARATION THEREOF  
3515509 PROCESS FOR EXTRACTING AND CONCENTRATING EUROPIUM  
Matches 151 - 200 out of 284 < 1 2 3 4 5 6 >