Class 71/37 - Acid treatment

Subclass of Class 71 - Chemistry: fertilizers
Definition: Methods of preparing phosphatic fertilizers where the starting
No. of patents: 30
Last issue date: 02/13/2007

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Number	Title	Issue Date
7175683	Process for transforming sludge into NPK type granulated fertilizer A process for transforming sludge into npk type granulated fertilizer in which the energy consume is reduced a 90% thanks to the addition of a special filtration step in which the water content is reduced a 50% and the remaining water is evaporated by the exothermic...	02/13/2007
7030061	Productive process for manufacturing an algal species-based organic complement for vegetal fertilization An organic complement for fertilizing vegetable species, as an organic product which fulfills with the features of a growth stimulator, mainly manufactured from green algae (Ulva rigida) and brownish algae (Macrocystis pyrifera). The invention includes...	04/18/2006
6406510	Methods for treating wastewater sludge This invention relates to methods for treating wastewater sludge cake with acid and calcium carbonate under acidic, low heat conditions to produce a stable, soil-like or granular, finished product containing calcium carbonate, useful as a nitrogen fertili...	06/18/2002
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
5275639	Recovery of phosphates from elemental phosphorus bearing wastes A process for oxidizing aqueous elemental phosphorus containing residues (sludges) to produce orthophosphate containing slurries suitable for subsequent reaction with ammonia to produce nitrogen- and phosphorus-containing fertilizer products. It comprises...	01/04/1994
5019148	Homogeneous mineral granules by acid-base reaction A stepwise method of preparing homogeneous mineral granules for agriculture by coreaction of commodity acids and bases which have properties to chemically form a transient fluid adhesive which will harden to form a strong granule binding cement. Water may...	05/28/1991
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
4589906	Inorganic 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
4523941	Process for the partial solubilization of phosphate rock and obtaining phosphate fertilizers therefrom A rapid, low temperature process for solubilizing phosphate rocks having high content of foreign matter or a low phosphorus content to obtain: (a) a slow release fertilizer of the NP type; (b) phosphoric acid of high concentration plus MAP; and (c) DAP....	06/18/1985
4515615	Manufacturing and using nitrogen fertilizer solutions on a farm To make non-pressure nitrogenous fertilizer solutions, nitrogen oxides are prepared in a continuous process by burning ammonia in contact with a cobalt oxide catalyst started by an electric arc without preheating the gases. This burning forms nitrogen oxi...	05/07/1985
4512794	Manufacturing and using nitrogen fertilizer solutions on a farm To make non-pressure nitrogenous fertilizer solutions, nitrogen oxides are prepared in a continuous process by burning ammonia in contact with a cobalt oxide catalyst started by an electric arc without pre-heating the gases. This burning forms nitrogen ox...	04/23/1985
4511389	Manufacturing and using nitrogen fertilizer solutions on a farm To make and use nitrogenous fertilizer on a farm, nitrogen dioxide is prepared in a continuous process from air or from ammonia in a reactor, with the ammonia either being transported to the farm or being prepared on the farm in a continuous process from ...	04/16/1985
4486217	Compound solid fertilizer and manufacturing method thereof A method for manufacturing a compound solid fertilizer is disclosed in which, inexpensive chlorides such as potassium chloride, ammonium chloride and so forth are used as supplementary fertilizer components to be admixed with a phosphate or silicophosphat...	12/04/1984
4478633	Method for processing wastes resulting from production of phosphorus, namely, slime and off-gasses, with utilization of the resultant products The method comprises processing slime and off-gases resulting from the production of phosphorus with an aqueous solution of copper sulphate having a concentration of from 15 to 50% at a temperature within the range of from 20° to 80° C. As a result, two...	10/23/1984
4469504	Process for the partial solubilization of phosphate rock and obtaining acid and phosphate fertilizers therefrom A rapid, low temperature process for solubilizing phosphate rocks having high content of foreign matter or a low phosphorus content to obtain: (a) a slow release fertilizer of the NP type; (b) phosphoric acid of high concentration plus MAP; and (c) DAP....	09/04/1984
4462972	Method for producing fertilizer-grade phosphoric acid A process for producing fertilizer-grade phosphoric acid is disclosed. In the process, a rock slurry is produced from a predetermined quantity of phosphate rock and a predetermined quantity of pond water neutralized with ammonia. A predetermined rate of s...	07/31/1984
4440560	Mixed phosphatic fertilizer and process for producing the same In producing a mixed phosphatic fertilizer, humic acid is mixed with fused phosphate to cause the humic acid to react on alkaline ingredients of the fused phosphate for turning these alkaline ingredients into chelate compounds, so that water-soluble phosp...	04/03/1984
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
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
4252553	Process for production of fertilizers A process for the production of fertilizer by reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid and reacting the sulfur containing acid with a basic salt which may be solubilized as a result of the a...	02/24/1981
4168150	Process for production of fertilizers A process for the production of fertilizer by reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid and reacting the sulfur containing acid with a basic salt which may be solubilized as a result of the a...	09/18/1979
4137063	Production of potassium polyphosphates from potassium silicofluorides Potassium polyphosphate polymers having ratios of P2 O5 to K2 O which make them suitable as fertilizer products are prepared by reacting potassium fluosilicate also known as potassium silicofluoride with phosphoric acid an...	01/30/1979
4134750	Granular ammonium phosphate sulfate and urea-ammonium phosphate sulfate using a common pipe-cross reactor A process for the production of fertilizers from phosphoric and sulfuric acids, anhydrous ammonia, and urea, and more specifically, the production of high-analysis granular ammonium phosphates, ammonium phosphate sulfates, and urea-ammonium phosphate sulf...	01/16/1979
4073635	Process for producing a slurry suitable for the manufacture of a mixed fertilizer containing nitrogen plus phosphorus Crude phosphate is leached with nitric acid to produce an acid slurry, which is thereafter neutralized with ammonia in two successive stages while simultaneously cooling it and adding acid, part of the crude phosphate phosphorus being replaced with phosph...	02/14/1978
4073634	Process for production of fertilizers A process for the production of fertilizer comprising reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid, reacting the sulfur containing acid with a basic ion selected from the group consisting of cal...	02/14/1978
4028087	Fertilizer processes incorporating scrubbed flue gas sludge byproduct A process for the production of a granular fertilizer material from sludge materials discharged from scrubbing processes that remove pollutants from boiler flue gases. Waste sludge discharged from flue gas scrubber systems often contain large amounts of c...	06/07/1977
3966450	Animal waste odor treatment Controlling the odor of an animal waste slurry and increasing the plant nutrient values in said animal waste slurry is achieved by contacting an animal waste slurry with about 5 ppm to about 500 ppm hydrogen peroxide, adjusting the pH of the slurry to bet...	06/29/1976
3962329	Manufacture of granular isobutylidenediurea The preparation of isobutylidenediurea from isobutyraldehyde and urea, the particle size of the product being controlled by alternate use of sulfuric acid and phosphoric acid....	06/08/1976
3947262	Method of producing phosphorus-containing fertilizers A method of producing phosphorus-containing fertilizers, wherein the phosphate raw stock is treated with a mineral acid selected from the group, consisting of phosphoric acid, sulphuric acid and a mixture of both. The thus-obtained suspension of the phosp...	03/30/1976
3932166	Landfill and soil conditioner A method for converting organic waste materials into inert humus-like materials by charring the organic waste materials by heating and drying same in the presence of certain water-soluble inorganic acids, removing residual acid and other water-soluble con...	01/13/1976

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Class 71/37 - Acid treatment