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| Number | Title | Issue Date |
| 7695699 | Metal sulfate alcohol composition and process therewith A metal sulfate alcohol composition as well as a process to produce such composition is disclosed. Also disclosed is a process to produce polyester containing the metal sulfate alcohol composition. ... | 04/13/2010 |
| 7273579 | Process for production of gypsum/fiber board An improved process calcining a gypsum/cellulosic fiber slurry to produce a composite gypsum/cellulosic fiber product resides in adding a selected crystal modifier to the gypsum/cellulosic fiber slurry prior to the heating step to reduce the time necessary to carry ... | 09/25/2007 |
| 7261867 | Production of silver sulfate grains using organo-sulfate or organo-sulfonate additives An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipita... | 08/28/2007 |
| 7172742 | Method of preparing wet process phosphoric acid The present invention relates to a method of preparing wet process phosphoric acid, which comprises: dividing raw materials which contain phosphate rock slurry and sulfuric acid into two parts, and then feeding these two parts into two reactors separately. In the fi... | 02/06/2007 |
| 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 |
| 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 |
| 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 |
| 6544489 | Defoaming compositions for high acid strength media A defoaming composition useful in high strength acid media includes an ester condensate of a C12 -C20 fatty acid and a at least one alcohol derivative selected from the group consisting of C1 -C4 alcohol ethoxyl... | 04/08/2003 |
| 6365117 | Method for preparing phosphoric acid A method for preparing phosphoric acid from calcium phosphate ores, particularly ores highly contaminated with organic compounds, by decomposing the ore with sulphuric acid, wherein according to the invention the process of decomposition of calcium phosph... | 04/02/2002 |
| 6235257 | Process waters in phosphate manufacturing Modification of phosphoric acid manufacturing provides improved process waters: decontaminated water pH-adjusted to be only slightly acidic, scrubber process water, gypsum stack water, and a composite of the latter two waters. The composite water undergoe... | 05/22/2001 |
| 6231767 | Treatment of phosphatic wastes A process for treating thickened phosphatic clay suspensions, waste clay and phosphogypsum produced in the processing of phosphate ore by water beneficiation and chemical processing, the thickened phosphatic clay suspension having a solid content of from ... | 05/15/2001 |
| 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 |
| 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 |
| 5395603 | Automatic control system for a chemical process, especially a wet process phosphoric acid plant Maximum throughput of a wet process phosphoric acid plant at a fixed recovery can be obtained by controlling the filter feed to give a desired specific gravity of the filtrate from the last washing of the gypsum cake. The filtrate from the last washing of... | 03/07/1995 |
| 5362460 | Magnesium separation from dolomitic phosphate by sulfuric acid leaching Process for dissolving unwanted magnesium from phosphate ores by leaching with dilute sulfuric acid at automatically controlled pH. Minerals so treated are more easily converted by the conventional "wet" process into phosphoric acid, and yield better qual... | 11/08/1994 |
| 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 |
| 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 |
| 5108721 | Treatment of high nickel slimes A two-stage process for treating anode slimes and other residues containing a substantial amount of nickel without significant dissolution of silver and/or selenium in a single autoclave is disclosed. The process comprises, in a first stage, leaching the ... | 04/28/1992 |
| 5009873 | Crystal modification in wet process phosphoric acid production A wet process production of phosphoric acid in which phosphate rock is digested, whereby phosphoric acid is released and calcium sulfate crystals are formed, employs a polymeric crystal modifier in the digestion stage of the process to improve the separat... | 04/23/1991 |
| 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 |
| 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 |
| 4710364 | Continuous recovery of sulfur oxide from flue gas A process for removing sulfur dioxide from flue gas is disclosed. After passing through a precipitator to remove particulate material, the flue gas is conducted continuously through a fixed bed solid-gas contacting device containing activated carbon or na... | 12/01/1987 |
| 4704263 | Production of potassium phosphates by ion exchange A process for producing potassium phosphates by ion exchange using an Advanced Separation Device (ASD) is disclosed. The process is carried out by supplying a phosphate salt solution, a washing solution and a potassium salt regeneration solution to respec... | 11/03/1987 |
| 4702896 | Thermal treatment of phosphate rock An improved, substantially more energy efficient, thermal treatment process for use on relatively high organic content phosphate rock is herein taught wherein such rock is heated in two stages under controlled conditions to thereby yield an improved calci... | 10/27/1987 |
| 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 |
| 4501724 | Method for the wet process manufacture of phosphoric acid An improved method for the wet process manufacture of concentrated phosphoric acid is disclosed herein. A mixture of gaseous sulfur trioxide and sulfuric acid now replaces concentrated sulfuric acid as a process reactant which results in a higher heat of ... | 02/26/1985 |
| 4495161 | Energy recovery method and system for combined sulphuric acid and phosphoric acid manufacturing plant In conventional processes for manufacturing phosphoric acid, sulphuric acid is reacted with phosphate rock to produce weak phosphoric acid which is concentrated using steam from the associated sulphuric acid manufacturing operation. Low grade heat from th... | 01/22/1985 |
| 4485077 | Method for conducting wet grinding of phosphate rock in a phosphoric acid production plant A method and system for conducting wet grinding of mined phosphate rock before utilizing the same for the production of phosphoric acid by the wet process method, the method comprising the steps of: (1) wet grinding the phosphate rock in a medium of fresh... | 11/27/1984 |
| 4457781 | Method for solidifying waste slime suspensions Solidification of colloidal argillaceous matter in essentially non-settling, aqueous slime media into a solid stable matrix is accomplished by mixing such slime with a hydratable calcium sulfate and hydrating to form an interlocking strength bearing matri... | 07/03/1984 |
| 4452770 | Phosphoanhydrite process A wet process for producing phosphoric acid and phosphoanhydrite by acidulation of phosphate rock with a phosphoric acid/sulfuric acid mixture containing a very high recycle content of small sized anhydrite seed crystals. A strong phosphoric acid is obtai... | 06/05/1984 |
| 4424196 | Phosphohemihydrate process for purification of gypsum A wet process for producing phosphoric acid and phosphohemihydrate by acidulation of phosphate rock. A strong phosphoric acid is obtained with concomitant production of an improved calcium sulfate that is extremely low in radioactivity by operation in Reg... | 01/03/1984 |
| 4405575 | Method of defluorinating phosphates This invention comprises a method for removing fluorine from natural phosphates, superphosphate materials and wet process phosphoric acids starting materials comprising (a) admixing rock phosphate having a fluorine content above that desired with an acid ... | 09/20/1983 |
| 4402923 | Process for making phosphoric acid A phosphate rock slurry, which may be used in the production of wet process phosphoric acid, is provided by wet grinding the rock with partially neutralized, acid water. In one aspect, wet process phosphoric acid is made by advantageously recycling minera... | 09/06/1983 |
| 4399110 | Process for reducing the radioactivity of calcium sulfate prepared from phosphate rock The level of radioactivity in gypsum produced from phosphate rock can be reduced by adding to the slurry of acid and phosphate rock in the conventional process for producing phosphoric acid a combination of concentrated nitric acid or hydrochloric acid an... | 08/16/1983 |
| 4362705 | Process for the preparation of phosphoric acid and calcium sulphate anhydrite as well as phosphoric acid and calcium sulphate anhydrite obtained by this process Phosphate rock is digested with H2 SO4 into phosphoric acid and gypsum, the latter is separated off, washed and converted into anhydrite. After this first wash the gypsum is divided into a minor portion of fine crystals, which is dis... | 12/07/1982 |
| 4350671 | Method of preparing phosphoric acid by a wet process Phosphoric acid is produced by a wet process in a homogeneous medium from calcium phosphate ore, sulphuric acid and a continuously added aqueous solution of recycled acid. Part of the phosphate is treated in a primary reaction medium, prepared separately ... | 09/21/1982 |
| 4330364 | Process of strengthening dilute phosphoric acid A process for the concentration of dilute phosphoric acid in a phosphoric acid process characterized by a plurality of separate phosphoric acid cycles when the phosphoric acid is concentrated in each cycle by a vacuum evaporation is described wherein the ... | 05/18/1982 |
| 4328193 | Process for removing radium from monocalcium phosphate solutions by centrifugation Disclosed is a method for treating substantially homogeneous monocalcium phosphate (MCP) solutions that contain undesirable amounts of radium which comprises centrifuging these MCP solutions sufficiently to separate at least a portion of the radium from t... | 05/04/1982 |
| 4313915 | Method for the manufacture of phosphoric acid by the wet process The invention relates to a method for the preparation of phosphoric acids by the wet process by reaction of at least one natural phosphate on at least one strong acid, such as, preferably, sulphuric acid, characterized in that said reaction is effected in... | 02/02/1982 |
