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4389384 |
Process for reducing phosphate ore
A process for producing phosphorus pentoxide from phosphorus ore includes formation of a feed with a phosphate ore, silica and solid carbonaceous material in amounts to produce a feed mixture...
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4389380 |
Multiple-stage thermal beneficiation process for phosphate ores
A multiple-stage thermal beneficiation process for phosphate ores which comprises calcining a phosphate ore in a first stage at a temperature sufficient to destroy substantial quantities of organic...
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4380531 |
Process for preparing phosphorus acid from industrial waste materials
An improved process is provided for preparing highly purified phosphorus acid from industrial waste materials which are produced as by-products from the manufacture of sodium hypophosphite. Such...
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4379131 |
Production of phosphorus pentoxide with utilization of reaction heat
The invention relates to process for making phosphorus pentoxide by subjecting elementary phosphorus to a combustion reaction with the aid of air, the reaction heat being utilized for the...
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4374816 |
Process for producing hypo-phosphorous acid (H.sub.3 PO.sub.2) and non-transition metal hypophosphites
A process for producing hypophosphorous acid (H 3 PO 2 ) by reacting, in the absence of a catalyst and under an acidic condition, phosphine with an aqueous solution of hydrogen peroxide to produce...
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4355010 |
Process for removing phosphorus in vapor form and phosphanes from gas mixtures
Phosphorus in vapor form and phosphanes are separated from gas mixtures which consist of carbon monoxide, with or without hydrogen, nitrogen and steam. Concerned are more particularly the off-gases...
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4351813 |
Process for producing phosphorus pentoxide or phosphorus or phosphoric acid
A process for producing phosphorus pentoxide from phosphate ores in a rotary-type kiln includes heating, by exposure to a flame, a porous bed comprising phosphate ore and solid carbonaceous...
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4351809 |
Process for reducing phosphate ore
A process for reducing phosphate ore includes beneficiating phosphate ore to reduce alumina impurities while allowing fluoride impurities to remain in the beneficiated ore, mixing beneficiated ore...
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4330515 |
Preparation of phosphorous acid from industrial waste material containing phosphites
A process for the preparation of phosphorous acid from phosphites contained in industrial wastes, wherein the waste material is dissolved in an aqueous solution of phosphorous acid and reacted with...
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4289803 |
Foundry mold treating compositions and methods of making same
Phosphosilicate compositions are disclosed for treating foundry molds and like products to enhance mold strength and refractoriness. The phosphosilicates, characterized more specifically as silicyl...
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4267131 |
Method for intimate contacting of plural phases and phase contactor apparatus therefor
Intimate contacting of plural, physically disparate phases is achieved by establishing a current of axially extending, axially symmetrical helical flow of a first phase; separately establishing a...
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4265866 |
Process for producing hypophosphorous acid (H.sub.3 PO.sub.2) and non-transition metal hypophosphites
A process for producing hypophosphorous acid (H 3 PO 2 ) by reacting, in the absence of a catalyst and under an acidic condition, phosphine with an aqueous solution of hydrogen peroxide to produce...
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4263234 |
Method of intimate contacting/separating of plural phases and phase contactor/separator apparatus therefor
Intimate contacting of plural, physically disparate phases is achieved by establishing a current of axially extending, axially symmetrical helical flow of a first phase; separately establishing a...
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4219533 |
Apparatus for the production of hexagonal phosphorus pentoxide
Hexagonal phosphorus pentoxide is made in an apparatus comprising a combustion chamber (1) which has a plurality of cooling pipes (10) disposed at its inside wall and is connected through a gas...
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4216012 |
Process for the treatment of incinerated sewage sludge ash
A process for the treatment of incinerated sewage sludge ash containing silicic compounds and metal values including phosphorus and at least one precious metal comprises leaching the ash in an acid...
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4185079 |
Removal of phosphine contaminant from carbon monoxide gas mixtures
A method for removing small concentrations of phosphine contained in a carbon monoxide gas mixture by preferentially oxidizing the phosphine, in which the phosphine is oxidized with air at a...
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4154800 |
Process of producing phosphates and phosphoric acid
The process of treating insoluble phosphate ore in the form of calcium phosphate, such as phosphate rock or bone phosphate, at near ambient conditions with sulfur trioxide or sulfuric acid as...
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4120934 |
Method for working-up shale
The invention is a method for working-up shale while recovering metals therefrom and the sulphur content thereof. The method comprises crushing the shale and leaching and roasting the shale. The...
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4010241 |
Process for the production of hydrogen fluoride, phosphoric anhydride, calcium polyphosphates and nitric acid
A process for the production of hydrogen fluoride, phosphoric anhydride, calcium polyphosphates and nitric acid, is disclosed, characterized in that natural phosphate is heated by a plasma stream...
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3993737 |
Process for the production of silicoformic acid
A dry alkaline earth metal metasilicate or an alkali metal metasilicate is chemically reacted with a concentrated mineral acid in the ratio of 1:3 mols to produce silicoformic hydrogen salts and an...
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3956463 |
Production of phosphorus oxyhalide
Improvement in the oxygen oxidation of phosphorus trihalides, particularly phosphorus trichloride, to phosphorus oxyhalide, particularly oxychloride, by introducing phosphorus trihalide and gaseous...
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3935297 |
Carbo chlorination of AlPO.sub.4
A process of carbo-chlorination of AlPO 4 wherein AlPO 4 or AlPO 4 -containing material is introduced into a reactor along with chlorinating agents and a source of carbon. The reactor is heated...
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3927179 |
Process for manufacturing phosphorus oxychloride
A continuous process of manufacturing phosphorus oxychloride consisting essentially of introducing phosphorus trichloride into a reaction vessel along with phosphorus and an oxygen doning material...
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3888799 |
Fluorophosphazene polymers curable at room temperature
Improved P--N polymers in which at least some of the groups attached to the P atom contain reactive sites whereby the properties and the polymer may be modified by crosslinking and/or curing.
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3790343 |
METHOD FOR BLEACHING FIBROUS MATERIALS AND COMPOSITIONS THEREFOR
A bleaching composition for a fibrous material comprises an aqueous medium having dissolved therein sodium chlorite and sodium polyphosphate, said sodium polyphosphate being such that the molar...
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3656898 |
TRANSFORMATION OF PHOSPHORUS COMPOUNDS OBTAINED AS BY-PRODUCTS
A process whereby substantially low-valent phosphorus-containing compounds in waste by-products obtained in the manufacture of mineral and organic phosphorus compounds are converted into useful...
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3652211 |
PROCESS FOR THE PREPARATION OF AN ANHYDRIDE OF TRIVALENT PHOSPHORUS USING EXCITED CARBON DIOXIDE OR NITRIC OXIDE
A process for preparing an anhydride of trivalent phosphorus from elemental phosphorus using an electronically-excited carbon dioxide plasma stream or an electronically-excited nitric oxide plasma...
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3652213 |
PROCESS FOR THE PREPARATION OF AN ANHYDRIDE OF TRIVALENT PHOSPHORUS
A process for the preparation of an anhydride of trivalent phosphorus comprising subjecting elemental phosphorus to a plasma stream of thermally- and electronically-excited carbon dioxide is...
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3623992 |
ROCK SALT COMPOSITION AND METHOD
A rock salt product for rejuvenating fouled ion exchange resin beds, said rock salt having a particle size within the range from about No. 8 U.S. standard screen size to about five-eighths inches...
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3619304 |
METHOD OF MANUFACTURING GALLIUM PHOSPHIDE ELECTRO LUMINESCENT DIODES
A gallium phosphide electro luminescent diode is fabricated by contacting molten gallium containing gallium phosphide, an N-type impurity and oxygen with a P-type gallium phosphide substrate and...
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3617242 |
FLUIDIZED BED DEFLUORINATION OF PHOSPHATE ROCK
This invention relates to the defluorination of phosphate rock and similar natural phosphatic materials in a fluidized reactor in which there is no reaction between the rock and the defluorinating...
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3617569 |
REMOVAL OF PHOSPHATE FROM WASTE WATER
Phosphates are removed from an aqueous stream by a two-stage precipitation process whereby the bulk of the phosphates are first precipitated by addition of a soluble aluminum, calcium or iron salt...
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3617241 |
METHOD FOR PREPARING NITROPHOSPHATE FERTILIZER
Fertilizers are prepared by dissolving a phosphate mineral in nitric acid, extracting the resulting solution with an organic solvent, neutralizing the solvent or extract phase with ammonia, and...
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3615194 |
PROCESS FOR THE PREPARATION OF AN ANHYDRIDE OF TRIVALENT PHOSPHORUS
A process for the preparation of an anhydride of trivalent phosphorus wherein an anhydride of pentavalent phosphorus is reduced by carbon monoxide in a DC plasma flame is disclosed. The anhydride...
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3558114 |
PHOSPHORUS RECOVERY FEED CONTROL METHOD
Phosphorus values in the form of P 2O 5 are recovered from phosphate ores reacted with carbon, silica and oxygen-containing gas in a rotary furnace having a vitreous lining held in place...
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3537819 |
MANUFACTURE OF PHOSPHORYL FLUORIDE AND DIFLUOROPHOSPHORIC ACID
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3532461 |
PROCESS FOR PREPARING CHEMICAL COMPOUNDS CONTAINING TRIVALENT PHOSPHORUS
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3520742 |
ENCAPSULATION OF PARTICULATE NITRONIUM OXIDIZER SALTS WITH POLYMERIZATION OF ETHYLENICALLY UNSATURATED MONOMERS
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3503718 |
PHOSPHORUS TRIOXIDE-GROUP III COMPOUNDS
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3466147 |
PRODUCTION OF A HIGH BORIC OXIDE-CONTAINING PRODUCT
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3449072 |
SYNTHESIS OF FINELY DIVIDED OXIDE POWDERS
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3442629 |
PHOSPHONITRILIC POLYMERS
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3431087 |
METHOD FOR THE PREPARATION OF HIGH PURITY NITRONIUM SALTS
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3429659 |
PREPARATION OF PHOSPHORYL FLUORIDE AND DIFLUOROPHOSPHORIC ACID FROM PHOSPHATE ROCK
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3421849 |
METHOD FOR UPGRADING PEBBLE PHOSPHATE
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3406013 |
Process for the manufacture of a phosphorus oxychloride
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3395984 |
Boron phosphate having high surface area and method for production therefor
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3388969 |
Process for the preparation of phosphorus oxybromide
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3385666 |
Dioxygenyl fluorides of group v elements
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3377142 |
Phosphazophosphoryl difluorides and methods of preparation
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