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| Number | Title | Issue Date |
| 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 separation, in the attack liquor, between an insoluble solid phase and an aq... | 03/30/2010 |
| 7374740 | Process for producing high purity phosphates Phosphate rock is reacted with phosphoric acid to produce monobasic calcium phosphate. Monobasic calcium phosphate is reacted with ammonium carbonate to produce ammonium phosphate. Dibasic calcium phosphate is also produced as a by-product when monobasic calcium pho... | 05/20/2008 |
| 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 containing impurities and a separate aqueous phase comprising phosphate io... | 04/22/2008 |
| 7101522 | Production of dicalcium phosphate or monocalcium phosphate A process is provided for the production of dicalcium phosphate form a phosphate source material in which a solution of phosphoric acid is produced by the action of a suitable mineral acid, generally sulphuric acid, on a phosphate source material. Calcium fluoride i... | 09/05/2006 |
| 7093782 | Method and device for fine grinding of mineral particles A method for fine grinding of mineral particles consists of producing by atomization pellets, made from steel with a high carbon content, or cast iron, with a granular size range less than 15 mm and mixing the pellets with balls, made from steel or cast iron with di... | 08/22/2006 |
| 6989136 | Method for producing phosphoric acid The invention concerns a method for producing phosphoric acid, which consists in: at least an attack of phosphate ore with an attacking liquid containing soluble phosphate ions, forming of an attacking product, separating in the attacking product between an insolubl... | 01/24/2006 |
| 6676914 | Phosphate acidulation utilizing HF acid Phosphoric acid, essentially free from impurities, is prepared by reacting aqueous hydrofluoric acid with phosphate in particles of calcium bearing phosphate rock to form a calcium fluoride pseudomorph solid from which filter-grade phosphoric acid is sepa... | 01/13/2004 |
| 6562308 | Process for the recovery of phosphate from phosphate rock There is disclosed a wet process for the recovery of phosphate from phosphate rock which comprises leaching finely divided particles of phosphate rock with a protic acid at a temperature and for a time that favours dissolution, into a leachate, of the pho... | 05/13/2003 |
| 6451276 | Recovery of elemental phosphorus from phosphorus sludge Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the melted sludge and about 0.5 to about 5 wt % of an oxidizing age... | 09/17/2002 |
| 6428764 | Process for the production of calcium fluoride A process is disclosed for producing calcium fluoride. The process comprises (a) mixing phosphate rock with aqueous H2 SiF6 at ambient temperature for at least one hour; (b) nucleating the calcium fluoride in the slurry prepared in s... | 08/06/2002 |
| 6224844 | Process for the production of calcium fluoride A process is disclosed for producing calcium fluoride comprising: (a) mixing aqueous H3 PO4 with aqueous H2 SiF6 to form a mixture such that the concentration of H3 PO4 is at least about 3 ... | 05/01/2001 |
| 6183712 | Production of dicalcium phosphate or monocalcium phosphate from calcium phosphate A method of producing dicalcium phosphate from calcium phosphate includes reacting the calcium phosphate with a mineral acid such as sulphuric acid to produce a calcium salt and phosphoric acid. The calcium salt may then be hydrolyzed to form a calcium al... | 02/06/2001 |
| 6051196 | Purification of phosphorus containing scheelite ore A method for purifying a phosphorus containing scheelite ore is described wherein the calcite phase is selectively dissolved prior to dissolution of the apatite phase. Selective dissolution of the calcite produces several benefits: (1) a usable calcium so... | 04/18/2000 |
| 6042794 | Process for producing anhydrous MgCl2 A process for producing anhydrous magnesium chloride comprising steps of selective calcination of Mg-containing minerals, selective leaching of magnesium, separation of insoluble impurities, precipitation of magnesium chloride hexammoniate and thermal dec... | 03/28/2000 |
| 5679315 | Method of production of high purity silica The present invention provides a basic method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas, particularly the gas generated by acidulation. The basic method comprises recovering silicon tetrafluoride-cont... | 10/21/1997 |
| 5531975 | Process for the production of phosphoric acid and calcium fluoride Fluosilicic acid is reacted with phosphate rock in order to produce wet process phosphoric acid and calcium fluoride which is later reacted with sulfuric acid to produce hydrogen fluoride and calcium sulfate. The hydrogen fluoride is then stripped from th... | 07/02/1996 |
| 5427757 | Process for the production of phosphoric acid and hydrogen fluoride from phosphate rock and fluosilicic acid Fluosilicic acid is reacted with phosphate rock in order to produce wet process phosphoric acid and calcium fluoride which is later reacted with sulfuric acid to produce hydrogen fluoride and calcium sulfate. The hydrogen fluoride is then stripped from th... | 06/27/1995 |
| 5180569 | Process for the production of phosphoric acid and hydrogen fluoride from phosphate rock and fluosilicic acid Fluosilicic acid is reacted with phosphate rock in order to produce wet process phosphoric acid and calcium fluoride which is later reacted with sulfuric acid to produce hydrogen fluoride and calcium sulfate. The hydrogen fluoride is then stripped from th... | 01/19/1993 |
| 4952379 | Method for purifying calcium nitrate melt/solution which is separated from the mixture obtained by the solution of rock phosphate with nitric acid The present invention relates to a method for purifying calcium nitrate melt or solution separated from the mixture obtained by dissolution of rock phosphate with nitric acid. The melt contains fluorine and phosphorus as main contaminants. The mol-ratio p... | 08/28/1990 |
| 4716026 | Defluorination kiln restriction control agent and method An improved process for the thermal defluorination of phosphate rock is provided. The process comprises adding ammonia to the phosphoric acid fed to the kiln, the amount of ammonia added being effective for forming a eutectic with the fused ring and ball ... | 12/29/1987 |
| 4623528 | Recovery of fluorine from waste gases Fluorine in phosphate ores is present as the mineral fluorapatite. When the ores are digested with sulfuric acid a slurry is formed which can be filtered to make wet-process phosphoric acid. But fluorine compounds are discharged into the surrounding air d... | 11/18/1986 |
| 4615869 | Ore beneficiation process Phosphatic clay dispersions are modified by dispersing the phosphate matrix containing the clay in a dilute solution of selected acids prior to screening, sizing and other beneficiation operations.... | 10/07/1986 |
| 4606897 | Method to improve acidulation quality of Idaho phosphate rock Phosphate rock, containing appreciable quantities of organic impurities, is thermally treated under controlled conditions to fully utilize the fuel values of the organic matter contained therein. This process is beneficial for treating deposits of unalter... | 08/19/1986 |
| 4585629 | Treatment of water used in preparing phosphate matrix slurries There are disclosed method and compositions for reducing the viscosity of phosphate matrix slurries and improving consolidation characteristics of slimes resulting from the beneficiation of the slurries. An unexpectedly greater degree of viscosity reducti... | 04/29/1986 |
| 4557915 | Production of phosphoric acid Phosphoric acid is produced, with concomitant recovery of solids comprising compounds of fluorine and silica, by (i) acidulating a first amount of phosphate ore with a strong acid to produce a first phosphoric acid slurry, (ii) filtering said first slurry... | 12/10/1985 |
| 4485078 | Process for producing wet process phosphoric acid from phosphate rocks containing fluochlorapatite and related minerals Phosphoric acid is produced by the wet process from phosphate rock containing fluochlorapatite. The rock is ground in a crusher (10) to a size such that from about 50% to about 90% by weight will be passed by a -200 mesh U.S.S. sieve before being passed i... | 11/27/1984 |
| 4435370 | Preparation of monocalcium phosphate and/or phosphoric acid from phosphate rock Monocalcium phosphate, phosphoric acid and/or potassium phosphate, calcium fluoride and gypsum are produced in a process involving acidulation of phosphate rock with phosphoric acid, and wherein monocalcium phosphate dissolved in phosphoric acid is formed... | 03/06/1984 |
| 4393030 | Upgrading of phosphate ore Phosphate is upgraded to remove slimes therefrom by a process which comprises the steps of: (a) contacting the phosphate ore with a phosphoric acid solution having a concentration of about 1 to 20 weight percent in a desliming unit for a sufficient time t... | 07/12/1983 |
| 4391784 | Foam control during production of phosphoric acid Foam generated during the digestion of phosphate rock is removed from the slurry either by overflow, mechanical sweeps, or by vacuum from strategically located nozzles connected to vacuum lines. The foam, after liquefaction, is returned to the filter wher... | 07/05/1983 |
| 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 wt.% of SO4 -ions calculated to the amount of phos... | 06/07/1983 |
| 4222990 | Production of fluoride-free phosphates A method is disclosed for the acidulation of phosphate rock and the production of substantially pure alkali metal phosphates, calcium phosphates, and phosphoric acid which are essentially free of fluorides and recovery of the fluorine values from the star... | 09/16/1980 |
| 4205049 | Water injection for control of fines for producing defluorinated phosphate rock granules An improved process is described for preparing defluorinated phosphate rock (DPR) granules from fluorine-containing phosphate rock. In particular, the improvement is useful in conventional processes which comprise the steps of: (a) admixing fluorine-conta... | 05/27/1980 |
| 4167406 | High temperature decomposition process for producing an alkali-containing calcined phosphate fertilizer An alkaline high temperature process for the production of alkali containing highly citrate soluble calcined phosphate fertilizer is disclosed. The process comprises calcining a preheated mixture comprising a crude phosphate, an alkaline decomposing agent... | 09/11/1979 |
| 4152398 | Process for producing defluorinated phosphate rock granules An improved process is described for preparing defluorinated phosphate rock (DPR) granules useful as animal feed from fluorine-containing phosphate rock.... | 05/01/1979 |
| 4152397 | Method for the conversion of phosphate rock containing magnesium into phosphoric acid and a mixture of magnesium and calcium carbonates Magnesium-bearing phosphate rock in small grain size is converted into phosphoric acid so that no by-products, which are difficult to dispose of are produced. The crushed rock is mixed with water and subsequently acidified with nitric acid, the reaction p... | 05/01/1979 |
| 4113835 | Process for preparing pure synthetic calcium sulfate semihydrate A process for the purification of phosphate containing impure gypsum to obtain therefrom calcium sulfate semihydrate in a purified form by digesting the phosphate containing gypsum with nitric acid at a temperature between 22° and 100° C, the temperatur... | 09/12/1978 |
| 4108957 | Method for manufacture of phosphoric acid from phosphate rock A method is disclosed for the manufacture of phosphoric acid directly from phosphate rock wherein the crushed phosphate rock is mixed with dilute phosphoric acid to form a slurry and the slurry is then heated to produce calcium monophosphate. Thereafter, ... | 08/22/1978 |
| 4043789 | Process for manufacturing of phosphoric acid The invention relates to a process for the production of phosphoric acid containing calcium phosphates, i.e. Ca-containing phosphoric acid, by evaporating Ca-containing mother liquor from Odda process, whereby practically all the remaining nitrate and flu... | 08/23/1977 |
| 4040519 | Froth flotation process for recovering sheelite This invention relates to a froth flotation process for recovering scheelite from scheelite ores. This invention comprises adding a sulphonate collector or a mixture of a sulphonate collector and a fatty acid collector to a pulp containing the ores, selec... | 08/09/1977 |
| 4039624 | Method of producing phosphoric acid from high iron and aluminum content phosphate rocks using nitric acid This invention concerns the solubilization of phosphate values in phosphate bearing rock which contains high contents of aluminium and/or iron by attacking the phosphate rock with a nitric acid leach solution for a time suitable to produce a phosphate ric... | 08/02/1977 |
