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| Number | Title | Issue Date |
| 8425872 | Process for the production of high purity phosphoric acid The invention relates to a process for the production of high purity phosphoric acid which has a very low content in antimony, and is suitable for food, pharmaceutical, or electronic industry. ... | 04/23/2013 |
| 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 |
| 7168553 | Dynamically balanced substrate carrier handler In a first aspect, a substrate loading station is served by a conveyor which continuously transports substrate carriers. A substrate carrier handler that is part of the substrate loading station operates to exchange substrate carriers with the conveyor while the con... | 01/30/2007 |
| 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 |
| 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 |
| 6911188 | Production of two alkali metal salts by a combined ion exchange and crystallization process The invention relates a process for producing an alkali metal nitrate and an alkali metal phosphate in the same process from a phosphate raw material and a nitrate raw material comprising the steps of: a) reacting the phosphate raw... | 06/28/2005 |
| 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 |
| 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 |
| 5378258 | Method and an installation for producing granulated triple superphosphate (TSP) A method and an installation for producing granulated triple superphosphate wherein a premixer for phosphate and a phosphoric acid solution includes unclogging means comprising in combination a flexible axial sleeve of non-vulcanized elastomer for injecti... | 01/03/1995 |
| 5211735 | Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock The invention aims at a process for preparing phosphated or nitrophosphated fertilizers through reaction of phosphate rock in aqueous pulp, with sulfuric and/or phosphoric acids, with addition, or not, of ammonia, so as to produce fertilizers of the types... | 05/18/1993 |
| 5188812 | Automatic control system for a phosacid attack tank and filter A method for controlling the phosphoric acid product concentration in a continuous phosphoric acid recovery process comprising supplying a constant feed stream of phosphate ore to an attack tank wherein the phosphate ore is subjected to attack by sulfuric... | 02/23/1993 |
| 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 |
| 5124137 | Process for the preparation of alkali metal phosphate solutions Alkali metal phosphate solutions having a fluorine content of less than 20 ppm, based on P2 O5, are prepared by first digesting crude phosphate using sulfuric acid, and separating the calcium sulfate from the crude phosphoric acid. A... | 06/23/1992 |
| 5098461 | Phosphatic and nitrogen fertilizers via HNO3 processing A process for producing high-analysis dicalcium phosphate containing phosphatic fertilizers and by-product calcium nitrate. It comprises reacting phosphate rock with nitric acid, followed by pyrolysis of the resulting acidulate to effect liberation of app... | 03/24/1992 |
| 5084261 | Recovery and utilization of gypstack leachate in hemihydrate phosphoric acid process Disclosed is a process for treating a waste stream containing calcium sulfate by depositing said waste stream on a gypstack, collecting the leachate from the gypstack, and recovering the P2 O5 values therefrom. Also disclosed is appa... | 01/28/1992 |
| 5066471 | Lowering post-precipitation in merchant acid The present process stabilizes merchant acid from bottoms solutions against post-precipitation by heating the acid to a temperature of at least about 180° F. for about 12 to about 48 hours. The stabilized acid product exhibits less than about 1 wt % soli... | 11/19/1991 |
| 4994248 | P2 O5 recovery and phosphoric acid purification Disclosed is an improved process for purifying phosphoric acid where a calcium sulfate hemihydrate slurry is first filtered to produce a first filtrate and a filter cake which comprises calcium sulfate hemihydrate, the calcium sulfate hemihydrate filter c... | 02/19/1991 |
| 4834787 | Phosphate rock utilization A process providing solubilization of phosphate rock by contacting the rock with sulfurous acid in the presence of an oxidizing agent selected from the group consisting of hydrogen peroxide and ozone. Use of sulfurous acid in combination with a substoichi... | 05/30/1989 |
| 4828811 | Method for producing phosphoric acid from phosphate ore A process and apparatus for producing phosphoric acid by the recovery of P2 O5 from a phosphate ore is disclosed. A slurry of a phosphate ore in an aqueous phosphoric acid solution is formed in each of a plurality of reaction zones c... | 05/09/1989 |
| 4822582 | Process for the removal of heavy metals from acid, phosphate-containing, aqueous media A process for the removal of heavy metals from an acid phosphate containing, liquid medium in which process a precipitate containing heavy metals is formed and is subsequently separated and wherein at least one of the two additives (a) sulphate ions and (... | 04/18/1989 |
| 4797265 | Process for the production of highly concentrated phosphoric acid A process for the production of highly concentrated phosphoric acid, comprises improvements in digesting phosphate rock with a mixed acid consisting essentially of sulfuric acid and phosphoric acid to obtain a slurry comprising phosphoric acid and hemihyd... | 01/10/1989 |
| 4793979 | Process for chemical separation of phosphorus ore The present invention is depicting a chemical separation of phorphorus ore. Phosphorus ore, especially calcareous and clacareous-sillicious phosphorus ore can be effectively converted into several products through chemical separation, which consists of tw... | 12/27/1988 |
| 4777027 | Continuous process for preparing phosphoric acid and calcium sulphate There is described a process which comprises adjusting on the one hand the flow rates of a circulating mixture relative to a base flow rate according to very specific specifications, and on the other hand so adjusting the reaction conditions in succeeding... | 10/11/1988 |
| 4743438 | Process for producing phosphoric acid from low purity phosphate rock An improved process for extending the capabilities of an existing, conventional wet-process phosphoric acid production plant to more effectively utilize phosphate values contained in low purity phosphate rock which process comprises (1) adjustment of the ... | 05/10/1988 |
| 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 to convert the polyphosphoric acid to orthophosphoric aci... | 12/22/1987 |
| 4683127 | Process for making wet-process phosphoric acid Wet-process phosphoric acid is made by subjecting a phosphate ore to processing treatment with a mineral acid resulting in the formation of a processed suspension. The formation of silicofluorides is obviated by adding, either to the phosphate ore or the ... | 07/28/1987 |
| 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) formed in the attack operation, and eliminatio... | 02/17/1987 |
| 4636372 | Aluminum fluorophosphates made from impure phosphoric acids and conversion thereof to alkalimetal phosphates Alkali metal phosphates and HF can be produced from a substantially calcium-free fluoroaluminum phosphate precipitate (which also contains iron) made by the aging of wet process phosphoric acid containing iron, fluorine and aluminum, preferably phosphoric... | 01/13/1987 |
| 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 |
| 4592901 | Method of removing suspended solids from phosphoric acid A process for removing impurities from phosphoric acid, especially concentrated wet process phosphoric acid, comprises filtering phosphoric acid through a filter cake (e.g., diatomite) on a porous member at a temperature in the range of about 57° C. to a... | 06/03/1986 |
| 4588570 | Method for the preparation of phosphoric acid and calcium sulphate The present invention provides a continuous method for preparing phosphoric acid and calcium sulphate by reacting calcium phosphate with a mixture of sulphuric acid and phosphoric acid. Our method uses at least three successive crystallization steps: a fi... | 05/13/1986 |
| 4559204 | Treatment of phosphate ore used in preparing phosphate matrix slurries There is disclosed a method of producing water-based phosphate matrix slurries wherein the as-mined phosphate matrix is dried prior to the formation of the slurry. Drying the matrix decreases the viscosity of the slurry and improves the clay consolidation... | 12/17/1985 |
| 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 |
| 4556545 | Method for conditioning phosphate ores There is disclosed an improved process of beneficiating phosphate-containing ores. The process comprises stabilizing a hydrocarbon oil, normally used in a conditioning step to improve separation of the ore from the solid contaminants in a flotation step, ... | 12/03/1985 |
| 4528021 | Granulated fertilizer and slurry process therefor A continuous process for the production of a granulated fertilizer wherein comminuted phosphate rock, phosphoric acid and water are introduced into a pre-reactor where they are heated. The mixture is continuously withdrawn and transferred to a digester wh... | 07/09/1985 |
| 4524054 | Process for the production of dicalcium phosphate A process for the recovery of phosphate values from a phosphate ore, wherein the ore is leached with a mixture comprising water, sulphur dioxide and an organic carbonyl compound; the leach liquor containing dissolved phosphate values and calcium hydroxysu... | 06/18/1985 |
| 4521392 | Process for blending phosphoric acids of differing impurity content Phosphoric acids of significantly different content of soluble impurities, especially magnesium compounds, can be blended to produce a phosphoric acid with a decreased tendency for forming detrimental solids when converted to a liquid fertilizer or on sto... | 06/04/1985 |
