Heat-treatment Patents (Class 71/44)
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Patent number: 10259752Abstract: A method of calcination includes providing a raw material including whitlockite Ca9(Mg,Fe2+)[PO3(OH)|(PO4)6], and/or iron phosphate FePO4, and/or aluminum phosphate AlPO4 and/or fluorapatite Ca5(PO4)3F; providing an alkaline-sulfuric compound as an additive; and calcining a mixture of the raw material with the additive to obtain a product, including a citrate soluble phosphate compound.Type: GrantFiled: June 11, 2015Date of Patent: April 16, 2019Assignees: OUTOTEC (FINLAND) OY, BUNDESREPUBLIK DEUTSCHLAND, VERTRETEN DURCH DAS BUNDESMINSITERIUM FÜR WIRTSCHAFT UND ENERGIE, DIESES VERTRETEN DURCH DEN PRÄSIDENTEN DER BAM, BUNDESANSTALT FÜR MATERIALFORSCHUNG UND -PRÜFUNGInventors: Jan Stemann, Christian Adam, Ludwig Hermann
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Patent number: 8999031Abstract: A composite particle and a population of particles comprising a water-insoluble polyphosphate composition, methods of producing, and methods of using the same are provided. The polyphosphate composition may comprise at least one alkaline earth metal selected from calcium and magnesium and optionally at least one nutrient ion selected from the group consisting of potassium, ammonium, zinc, iron, manganese, copper, boron, chlorine, iodine, molybdenum, selenium or sulfur.Type: GrantFiled: August 8, 2011Date of Patent: April 7, 2015Assignee: Agtec Innovations, Inc.Inventor: Chandrika Varadachari
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Publication number: 20130309308Abstract: The present invention relates to a method of converting limestone into tri-calcium phosphate (TCP) and tetra-calcium phosphate (TTCP) powder simultaneously. In particular, the method provides for a method of converting limestone into TCP and CTTCP powder simultaneously having specific particle size and with specific crystallographic structure.Type: ApplicationFiled: September 29, 2011Publication date: November 21, 2013Applicant: SIRIM BerhadInventors: Fazilah Binti Fazan, Sudirman Bin Sahid, Wan Ruzaini Bin Wan Sulaiman, Norshahida Binti Kader Bashah
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Publication number: 20100240533Abstract: A water insoluble micronutrient fertilizer, methods of producing, and methods of using the same are provided. The fertilizer may comprise at least one first micronutrient selected from the group consisting of chromium, cobalt, copper, iron, manganese, and zinc; a polyphosphate; and optionally at least one second micronutrient selected from the group consisting of boron, chlorine, iodine, molybdenum or selenium.Type: ApplicationFiled: March 19, 2010Publication date: September 23, 2010Inventor: Chandrika Varadachari
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Patent number: 7468087Abstract: Disclosed are a fertilizer containing a sparingly water-soluble phosphatic fertilizer and an urea/aliphatic aldehyde condensation product. The process for controlling inorganizing speed of urea/aliphatic aldehyde condensation product comprises adding to the urea/aliphatic aldehyde condensation product a sparingly water-soluble phosphatic fertilizer having special elution characteristics. The fertilizer of the invention and the process for controlling inorganizing speed of urea/aliphatic aldehyde condensation product of the invention make it possible to control the inorganizing speed of the condensation product without changing the particle size or form. The fertilizers of the invention or the urea/aliphatic aldehyde condensation products can provide nitrogen components to plant in accordance with the periods of culture of desired crops and a pattern of absorbing nutrition. This is effective in saving of the number of additional fertilization or nitrogen components left in soil after the period of culture.Type: GrantFiled: June 7, 2006Date of Patent: December 23, 2008Assignee: Chissoasahi Fertilizer Co., Ltd.Inventors: Atsushi Sakamoto, Noriaki Harada, Kenji Fukuda
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Patent number: 7108732Abstract: The fertilizer of the invention is a fertilizer containing a sparingly water-soluble phosphatic fertilizer and a urea/aliphatic aldehyde condensation product. The process for controlling inoganizing speed of urea/aliphatic aldehyde condensation product of the invention comprises adding to the urea/aliphatic aldehyde condensation product a sparingly water-soluble phosphatic fertilizer having special elution characteristics. The fertilizer of the invention and the process for controlling inoganizing speed of urea/aliphatic aldehyde condensation product of the invention make it possible to control the inorganizing speed of the condensation product without changing the particle size or form, that is, to control development of the efficacy of the condensation product used as a fertilizer.Type: GrantFiled: December 5, 2001Date of Patent: September 19, 2006Assignee: Chisso CorporationInventors: Atsushi Sakamoto, Noriaki Harada, Kenji Fukuda
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Patent number: 6488735Abstract: A fertilizer compound having a glass matrix comprises, among the forming oxides of the glass matrix, a phosphorus pentoxide (P2O5) as partial and/or full replacement of silica (SiO2); among the modifier oxides of the said glass matrix, a potassium oxide (K2O) as partial and/or full replacement of sodium oxide (Na2O); and one or more trace elements.Type: GrantFiled: September 22, 2000Date of Patent: December 3, 2002Inventors: Giuseppe Macchioni, Giovanni Marazzi, Franco Ambri
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Patent number: 5965117Abstract: Water-buoyant compositions comprising a source of micronutrients for photosynthetic phytoplankton growth are useful for stimulating photosynthetic phytoplankton growth in ocean areas devoid of such growth when deployed on ocean surfaces as floating particles. Iron is the preferred micronutrient.Type: GrantFiled: January 22, 1998Date of Patent: October 12, 1999Assignee: E.I. du Pont de Nemours and CompanyInventors: Edward G. Howard, Jr., Thomas C. O'Brien
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Patent number: 5378258Abstract: 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 injecting phosphate together with at least one sprayer for spraying the phosphoric acid solution and acting level with the free bottom end of the sleeve. The invention is applicable to the chemical industry.Type: GrantFiled: July 9, 1992Date of Patent: January 3, 1995Assignee: Maroc- ChimieInventor: El Hadi Kendili
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Patent number: 4589906Abstract: A depot fertilizer composition comprising an inorganic matrix and another inorganic and/or organic component of the formulaX Me(II)O.[(1-x)/2]Me(III).sub.2 O.sub.3.YA.zI.aqin whichMe (II) is at least one divalent metal,Me(III) is at least one trivalent metal,A is at least one inorganic acid or anhydride of an inorganic acid,I is at least one organic compound,aq is 0-9,X is from 0 to 1,Y is from 0.5 to 0.7, andZ is from 0 to 20,at least one of the components containing a plant nutrient element. The compositions are suited for fertilizing the leaves or full systems of plants growing in soil or in water.Type: GrantFiled: March 28, 1983Date of Patent: May 20, 1986Assignee: Bayer AktiengesellschaftInventors: Horst Brunn, Johannes Niggemann, Peter Kohler, Franz Hund
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Patent number: 4528021Abstract: 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 where heating is continued resulting in formation of a slurry. The slurry is continuously withdrawn and is split into two streams, one of which is recycled to either the pre-reactor or to the digester while the other stream is delivered to a granulator where it is mixed with other fertilizer ingredients and dried to form the granulated fertilizer.Type: GrantFiled: December 15, 1983Date of Patent: July 9, 1985Assignee: International Minerals & Chemical Corp.Inventor: John L. Medbery
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Patent number: 4427433Abstract: Method for production of granular ammonium polyphosphate fertilizer in which ammonium polyphosphate melt is prepared in a simple inline reactor and distributed onto a bed of solids in a drum granulator to bind smaller fertilizer particles into granules. The desired polyphosphate content can be obtained in the granular product by adjusting the total heat input of the feed reactants to the reactor by means of energy conservation modifications to the system. Energy losses are controlled by use of a predetermined quantity of insulation so that varying amounts of the maximum theoretical heat input can be utilized to produce products of polyphosphate contents as desired.Type: GrantFiled: September 3, 1982Date of Patent: January 24, 1984Assignee: Tennessee Valley AuthorityInventors: Byron R. Parker, Thomas R. Stumpe
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Patent number: 4402756Abstract: A granular fertilizer and insecticide carrier-filler material which is produced from phosphatic clays is disclosed along with its method of production. The granular carrier-filler material is water-degradable, and is prepared from waste phosphatic clays by tilling the source material, allowing it to dry, crushing the dried material into granules, heating the granules at a temperature of about 450.degree. F. to less than 1600.degree. F. to obtain a granular carrier-filler material having a moisture content of no more than about 15% by weight. Depending upon end use applications, the granular carrier-filler material may be sized as by screening.Type: GrantFiled: October 5, 1981Date of Patent: September 6, 1983Assignee: Chesley B. MaddoxInventor: Robert G. Prine
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Patent number: 4324577Abstract: Method and apparatus for producing high grade phosphate rock from low grades, slime or tailings by subjecting the low grade rock, slime or tailings to a calcination treatment at a temperature within the range from 1000.degree. F. to 1600.degree. F., and preferably from 1400.degree. F. to 1600.degree. F., until a fraction of said rock, slime or tailings becomes magnetically attractable, and subjecting the treated material to a high strength magnetic field to separate the same magnetically into at least two fractions, one of increased BPL and one of decreased BPL.Type: GrantFiled: February 25, 1980Date of Patent: April 13, 1982Assignee: Beker Industries, Inc.Inventor: Hossein K. Sepehri-Nik
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Patent number: 4321078Abstract: A slow release fertilizer composition providing to a plant a controlled amount of plant primary nutrients and micronutrients over a prolonged period of time is described. The solubility and concentration of each of the plant nutrients is determined by the addition to the fertilizer composition of specified fertilizer constituents or components which on going into solution coact to control at an optimum concentration each of the plant nutrients. The slow release fertilizer composition comprises the plant primary nutrients nitrogen, phosphorous, calcium, sulfur, magnesium, and potassium and the plant micronutrients iron, manganese, zinc, copper and boron. A single application of the fertilizer composition of the present invention provides sufficient plant nutrients for a full growing season or one or more growing seasons.Type: GrantFiled: June 30, 1980Date of Patent: March 23, 1982Inventor: Michael A. Michaud
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Patent number: 4286982Abstract: A one vessel process for manufacturing stable ammonium phosphate fertilizer utilizes a spray reactor in which phosphoric acid is reacted with ammonia to form ammonium phosphate. The ammoniation is conducted under conditions which form sufficient ammonium polyphosphate to stabilize the solution in the liquid condition. The liquid may be stored and transported without substantial solidification or crystalization so that the product may be subsequently used as an ammonium phosphate fertilizer.Type: GrantFiled: July 2, 1979Date of Patent: September 1, 1981Inventor: James S. Bremmer
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Patent number: 4239523Abstract: A fertilizer rich in calcium metaphosphate is produced by reacting phosphorite or other calcium phosphate-bearing mineral, with ammonium bisulphate to produce a precipitate of calcium sulphate and an aqueous solution rich in ammonium mono- and biphosphates. The latter is then heated in a furnace in the presence of further calcium phosphate-bearing mineral, to produce calcium metaphosphate. The calcium sulphate can be converted to calcium carbonate by reaction with ammonium carbonate, to produce ammonium sulphate. The ammonium sulphate can be heated with the furnace gases from the production of calcium metaphosphate, to produce the required ammonium bisulphate for reaction with phosphorite and the required ammonium carbonate for a conversion of the calcium sulphate to calcium carbonate.Type: GrantFiled: July 25, 1978Date of Patent: December 16, 1980Inventor: Vittorio Spada
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Patent number: 4210438Abstract: Liquid ammonia, a reactant with superphosphoric acid in the process for fertilizer production, is passed through an annular jacket surrounding a tubular reaction zone where reaction occurs to maintain the interior surface of the tubular reactor at a temperature sufficiently low to prevent the formation of scale on interior reactor surfaces.Type: GrantFiled: September 7, 1977Date of Patent: July 1, 1980Assignee: Occidental Petroleum CorporationInventor: Philip W. Casperson
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Patent number: 4205049Abstract: An improved process is described for preparing defluorinated phosphate rock (DPR) granules from fluorine-containing phosphate rock.Type: GrantFiled: May 31, 1977Date of Patent: May 27, 1980Assignee: Olin CorporationInventors: Ronald J. Smith, Manuel A. Gonzalez
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Patent number: 4154593Abstract: A process for granulating ammonium phosphate containing composition for use as a fertilizer which comprises feeding a slurry or melt of ammonium phosphate, wherein said slurry or melt is capable of further reaction with ammonia, into a kneading mill, feeding recycled particles from the subsequent classification and crushing procedure into said kneading mill, wherein the said slurry or melt added to the mill is from 5 to 95% wt.Type: GrantFiled: February 16, 1977Date of Patent: May 15, 1979Assignee: Mississippi Chemical CorporationInventors: Marion L. Brown, Charles A. Johnson, III, Gerald L. Tucker
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Patent number: 4106922Abstract: A process for the production of highly citrate-soluble calcined phosphate fertilizers is disclosed. The process comprises calcinating a mixture which comprises appropriate amounts of calcium phosphates, silicic acid and an alkaline decomposing agent whereby the naturally occurring mineral trona is used as an alkaline decomposing agent. The process is effected in a rotary kiln; the maximum temperature is about 1300.degree. C.Type: GrantFiled: February 18, 1977Date of Patent: August 15, 1978Assignee: Kali-ChemieInventors: Ulrich Hauschild, Heinrich Roetger
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Patent number: 4101636Abstract: An improved process is described for preparing defluorinated phosphate rock from fluorine-containing phosphate rock which contains acid insoluble impurities in excess of about 6 percent by weight. The improvement is particularly useful in the fluidized bed technique for preparing defluorinated phosphate rock wherein fluorine-containing phosphate rock, a sodium compound such as sodium carbonate, phosphoric acid and water are admixed to form granules. The resulting granules are dried and heated in a fluidized bed calciner at a temperature within the range of from about 980.degree. to about 1,350.degree. C to evolve sufficient fluorine to produce defluorinated phosphate rock graules having less than 1 part of fluorine per 100 parts of phosphorus by weight. The resulting defluorinated granules are colled and stored for use as an animal feed which contains at least 18 percent by weight of phosphorus.Type: GrantFiled: January 21, 1977Date of Patent: July 18, 1978Assignee: Olin CorporationInventors: Harold V. Larson, Morris E. Clark
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Patent number: RE29149Abstract: Ammonium phosphate solutions free of precipitates are prepared from wet-process phosphoric acid containing incidental metallic impurities such as iron, aluminum and magnesium by concentration of the phosphoric acid to an anhydrous state and the formation of acyclic polyphosphoric acids therein which prevent the precipitation of the metallic impurities upon neutralization. The acid is heated to a temperature greater than 120.degree. C. at atmospheric or subatmospheric pressures while removing the volatile impurities and thereafter is neutralized with ammonia. The neutralization step can be performed at elevated temperatures with anhydrous ammonia or the acid can be cooled and neutralized at ambient temperatures. The resulting ammonium phosphate is diluted with water to obtain an ammonium phosphate solution which is clear and free of precipitates.Type: GrantFiled: July 3, 1967Date of Patent: March 8, 1977Assignee: Union Oil Company of CaliforniaInventor: Donald C. Young
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Patent number: T102601Abstract: Method for production of granular ammonium polyphosphate fertilizer in which ammonium polyphosphate melt is prepared in a simple inline reactor and distributed onto a bed of solids in a drum granulator to bind smaller fertilizer particles into granules. The desired polyphosphate content can be obtained in the granular product by adjusting the total heat input of the feed reactants to the reactor by means of energy conservation modifications to the system. Energy losses from the reaction system are controlled by use of a predetermined quantity of insulation so that varying amounts of the maximum theoretical heat input can be utilized to produce products of polyphosphate contents as desired.Type: GrantFiled: March 15, 1982Date of Patent: January 4, 1983Inventors: Byron R. Parker, Thomas R. Stumpe
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Patent number: H980Abstract: The present invention relates to methods and implementation, including apparatus comprising a two-stage, single-unit, and energy-efficient rotary drum-type granulator-dryer device having a granulator section and a separate dryer section in a new and novel combination designed for continuously granulating and/or ammoniating, and subsequently drying, respectively, a variety of materials together with specific processes for effecting such granulating and/or ammoniating, and subsequent drying.Type: GrantFiled: May 11, 1989Date of Patent: November 5, 1991Assignee: Tennessee Valley AuthorityInventor: Cecil P. Harrison