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Class 71/44 - Heat-treatment


Subclass of Class 71 - Chemistry: fertilizers
Definition: Methods of preparing phosphate containing fertilizers wherein
No. of patents: 18
Last issue date: 01/22/2008


NumberTitleIssue Date
7320724Compositions for the staged release of nutrients to plants
A fertilizer composition is adapted to stage the controlled release of nutrients such that the composition need only be applied once in a plant's growth cycle, but with individual nutrients releasing at predetermined, staged intervals targeted to the precise needs o...
01/22/2008
7108732Process for producing fertilizer comprising sparingly water-soluble phosphatic fertilizer, urea/aliphatic aldehyde condensation product and water-repellent substance
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 invent...
09/19/2006
6488735Fertilizer compound having a glass matrix
A fertilizer compound having a glass matrix comprises, among the forming oxides of the glass matrix, a phosphorus pentoxide (P2 O5) as partial and/or full replacement of silica (SiO2); among the modifier oxides of the said...
12/03/2002
5965117Water-bouyant particulate materials containing micronutrients for phytoplankton
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 partic...
10/12/1999
5378258Method 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
4589906Inorganic depot fertilizers
A depot fertilizer composition comprising an inorganic matrix and another inorganic and/or organic component of the formula in which Me (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...
05/20/1986
4528021Granulated 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
4427433Production of granular ammonium-polyphosphate with an inline reactor and drum granulator
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. T...
01/24/1984
4402756Granular-filler material and its method of preparation from phosphatic clays
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 b...
09/06/1983
4324577Method and apparatus for beneficiating phosphate ores
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° F. to 1600° F., and preferably fr...
04/13/1982
4321078Slow release fertilizer composition
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...
03/23/1982
4286982Process of manufacturing stable ammonium polyphosphate fertilizers
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 ...
09/01/1981
4239523Method for manufacturing phosphatic fertilizers having a high concentration, particularly calcium metaphosphate Ca(PO3)2
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 biphosphate...
12/16/1980
4210438Ammoniated phosphoric acid fertilizer production
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 tempe...
07/01/1980
4205049Water 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
4154593Process for granulating ammonium phosphate containing fertilizers
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, feed...
05/15/1979
4106922Alkaline decomposition process for producing calcined phosphate fertilizer
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 where...
08/15/1978
4101636Defluorinated phosphate rock process using lime
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 be...
07/18/1978
 
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