Matches 1 - 50 out of 146 1 2 3 >


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7824634 Method for etching phosphate ores  
A method for etching phosphate ores includes a single-pass digesting of ores which P205 content is greater than 20% in weight by a hydrochloric aqueous acid solution having an HCI concentration...
7687046 Method of producing phosphoric acid salt  
A method of preparing a phosphoric acid salt which includes at least one attack on phosphate ore by an aqueous solution of hydrochloric acid, with the formation of an attack liquor, a first...
7361323 Method for the production of phosphoric acid and/or a salt thereof and products thus obtained  
A method for the production of phosphoric acid comprising a phosphate ore attack by a first aqueous chlorohydric acid solution, separation in the attack liquor between a solid insoluble phase...
6645453 Solvent extraction process for recovery of uranium from phosphoric acid (25-55% P205)  
An improved process of extraction of uranium from phosphoric acid and in particular uranium VI from phosphoric acid especially strong phosphoric acid using a selective synergistic extractant mix of...
6251351 Wet-process technique for refining phosphoric acid  
A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates...
5326906 Process for the extractive removal of phospho- and sulfobetaines from acidic reaction solutions  
The ampholytes are extracted from the reaction solution with a liquid cation exchanger which is immiscible with the acidic aqueous reaction solution, where the cation exchanger is dissolved in at...
5047223 Separation of phosphoric acid from aqueous solutions of thiamine phosphates  
Phosphoric acid is separated from aqueous solutions of thiamine phosphates which are obtained in the phosphorylation of thiamine, with or without subsequent partial hydrolysis, by a process in...
5006319 Process for removing iron, chromium and vanadium from phosphoric acid  
A process is provided for purifying phosphoric acid, such as wet process phosphoric acid by extracting the impure phosphoric acid with a nonaqueous solvent and contacting the nonaqueous solution of...
4877594 Purification of phosphoric acid  
A mixture of hydrophobic and hydrophilic extractants is used to separate phosphate values from impurities found in phosphoric acid. In one approach, impurities are removed from phosphoric acid and...
4806324 Process for making phosphoric acid free from titanium  
Phosphoric acid substantially free from titanium is made from the organic extract obtained by subjecting crude phosphoric acid containing titanium to extractive purification with an organic solvent...
4781905 Process for producing phosphoric acid and/or phosphates from wet-process phosphoric acid and an extractant therein  
A process is developed for producing phosphoric acid and phosphates from wet-process phosphoric acid. The crude acid is extracted with a waterimmiscible solvent mixture consisting of mixed trialkyl...
4780295 Process for purifying phosphoric acid  
The invention is a process to purify a solution of phosphoric acid by removing transition metal impurities such as iron, chromium and vanadium. In the process a solution of phosphoric acid in an...
4769226 Purification of wet-process phosphoric acid  
Crude wet-process phosphoric acid is purified by treating a dilute such acid with a molybdenum value reducing amount of hydrogen sulfide or of a sulfide which in situ forms hydrogen sulfide, to...
4762692 Process for the precipitation and separation of cadmium sulphide from the raffinates derived from phosphoric acid purification  
Disclosed is a process for the precipitation and separation of cadmium sulphide from the raffinates derived from phosphoric acid purification by treating the cadmium containing streams of the...
4762693 Process for working up heavy metal-containing residues originally from the decontamination of crude phosphoric acid  
Residue obtained upon the removal of heavy metal contaminants from crude phosphoric acid by means of a dialkyldithiophosphoric acid ester and adsorbent is worked up into ecologically reliable solid...
4751066 Process for preparing alkali metal phosphate  
Alkali metal phosphates are recovered from a water immiscible solvent solution of aqueous wet process phosphoric acid by neutralizing the acid with a basic alkali metal salt in a ratio of alkali...
4714600 Process for production of phosphoric acid from dry matrix by SO3 treatment and extraction  
Phosphoric acid is produced from dry phosphate ore, matrix by acidulation with sulfur trioxide in the presence of sulfuric acid catalyst to form polyphosphoric acid, treatment with sufficient water...
4713229 Process for purifying phosphoric acid  
Wet process phosphoric acid is freed from heavy metal ions, especially from ions of cadmium, copper, mercury, lead and arsenic and optionally also from organic compounds and sulfuric acid. To this...
4676963 Manufacture of sodium tripolyphosphate from wet acid  
A process is described for converting wet acid into sodium tripolyphosphate by pretreating the wet acid in a pretreatment stage with a sodium source and SiO2 to precipitate fluoride values from the...
4643883 Method of decolorizing wet process phosphoric acid  
A method of decolorizing wet process phosphoric acid containing organic color-imparting impurities is provided. The process includes treating the acid with a strong oxidant at a temperature in the...
4643882 Process for recovery by a solvent of the uranium present in phosphoric acid  
A process for the recovery of the uranium present in phosphoric acid produced by a wet process in (A) by means of a suitable solvent (L9), which is carried out after separation of the gypsum in (B)...
4640824 Process for making alkali metal phosphate solutions containing little fluorine  
The disclosure relates to a process for making alkali metal phosphate solutions containing little fluorine from pre-purified alkali metal phosphate solutions obtained from crude phosphoric acid by...
4634580 Process for the purification of wet-process phosphoric acid by removal of cadmium  
A process for the removal of cadmium contained in wet-process phosphoric acid by flotation by means of a cadmium-collector anionic surface active agent and an injected gas in the presence of other...
4629614 Process for decontaminating phosphoric acid  
Wet-process phosphoric acid prepurified by liquid/liquid extraction with an organic solvent is decontaminated. To this end, the prepurified acid is first freed from residual extractant, then...
4596703 Process for purifying wet-processed phosphoric acid  
The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting...
4585636 Process for the manufacture of purified phosphoric acid  
The present invention relates to an improved process for the manufacture of purified phosphoric acid from phosphate rock. According to the invention, phosphate rock is decomposed by a mineral acid...
4556548 Process for purifying wet-processed phosphoric acid  
The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting...
4543239 Phosphoric acid extraction process  
A method for extracting phosphoric acid from wet process phosphoric acid is disclosed. N,N-dialkyl-α-aminoacids are contacted with wet process phosphoric acid to extract substantially pure ...
4540557 Process for reducing the fluorine content in wet-processed phosphoric acid  
The disclosure relates to a process for reducing the fluorine content in wet-processed phosphoric acid. To this end, the disclosure provides for an acid extract in an organic solvent to be treated...
4536378 Phosphate fertilizer production  
Processes for the preparation of phosphoric acid, such as merchant phosphoric acid, and for the provision of phosphoric acid suitable for the preparation of ammonium phosphates, are disclosed. Such...
4514365 Process for recovering a uranium-containing concentrate and purified phosphoric acid from a wet process phosphoric acid containing uranium  
A process for recovering from a wet process phosphoric acid which contains uranium, a uranium containing concentrate and a purified phosphoric acid. The wet process phosphoric acid is treated with...
4511541 Process for the recovery of cadmium and other metals from solution  
A process for the selective recovery of cadmium, molybdenum, zinc, nickel and other metal values from wet process phosphoric acid and other acidic to slightly basic carrier solutions, wherein the...
4503016 Process for extracting heavy metal ions from aqueous solutions  
The disclosure relates to a process for liquid/liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents....
4493820 Process for partial removing of impurities from a wet process phosphoric acid  
A process for the partial removal of impurities present in a wet process phosphoric acid used in the production of granulated mono- or di-ammonium phosphate fertilizers in order to control the...
4492680 Removal of cadmium from acidic phosphatic solutions  
The invention is concerned with a process of removing cadmium from acid, especially P2 O5 -containing solutions by liquid/liquid extraction with the aid of alkyl amine salts that are dissolved in...
4490336 Process for stripping uranium from an alkyl pyrophosphoric acid  
A process is described for the recovery of tetravalent uranium from wet-process phosphoric acid utilizing an alkyl pyrophosphoric acid extractant or the like. After extracting the tetravalent...
4479924 Process for the separation of heavy metal compounds from phosphoric acid  
A process for the separation of heavy metal components, especially of compounds of cadmium, mercury and lead, from crude phosphoric acid obtained according to the Odda process, which comprises...
4466948 Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid  
The disclosure relates to a process for removing heavy metal ions and arsenic from wet-processed phosphoric acid, wherein the crude wet-processed phosphoric acid is treated at temperatures between...
RE31629 Extraction process for purification of phosphoric acid  
Water immiscible organic acid phosphates used in conjunction with water immiscible organic sulfonic acids results in an improved process for the purification of phosphoric acid. An increase in the...
4457899 Process for removal of residual organic matter from purified phosphoric acid  
This invention provides a process for removal of residual organic matter from wet process phosphoric acid purified by solvent extraction with a volatile solvent that comprises contacting said...
4457848 Process for after-treating extraction residues originating from the decontamination of phosphoric acid  
The disclosure relates to a process for after-treating extraction residues, termed raffinates, originating from the extractive decontamination of crude phosphoric acid. To this end, the disclosure...
4452768 Process for removing heavy metal ions from wet-processed phosphoric acid  
The disclosure relates to process for removing heavy metal ions, especially cadmium, copper, lead and mercury ions from wet-processed phosphoric acid. To this end, the crude acid is contacted with...
4439408 Process and extractant for removing fluorine compounds from aqueous phosphoric acid  
The invention provides a process for removing fluorine compounds from aqus phosphoric acid containing the same, which process comprises contacting the phosphoric acid with a water insoluble...
4432945 Removing oxygen from a solvent extractant in an uranium recovery process  
An improvement in effecting uranium recovery from phosphoric acid solutions is provided by sparging dissolved oxygen contained in solutions and solvents used in a reductive stripping stage with an...
4427640 Sequential process for extraction and recovery of vanadium and uranium from wet process acids  
A process for preferentially extracting and recovering vanadium and uranium from wet process acids. The wet process acid first is contacted with a neutral organo-phosphorus compound to extract the...
4424195 Recovery of organic extractant from secondary emulsions formed in the extraction of uranium from wet-process phosphoric acid  
Uranium in wet-process phosphoric acid is extracted with an organic extractant. The pregnant extractant is then centrifuged to separate contaminants from the extractant. Secondary emulsions...
4407724 Process for producing emulsion  
Straight chain alkylsulphonic acid ethanol- and isopropanol amides are used as biodegradable non-ionogenic emulsifiers for producing an emulsion.
4394361 Method of purifying phosphoric acid  
An organic solvent system, for use in solvent extraction of wet process phosphoric acid, is a mixture of an organic phosphate ester and an essentially water-immiscible organic ketone or alcohol.
4377562 Solvent extraction method of phosphoric acid  
A method for solvent extraction of phosphoric acid comprises counter-currently contacting an impure phosphoric acid solution containing at least 45 wt. % of P2 O5 with a partially water-miscible...
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...
Matches 1 - 50 out of 146 1 2 3 >