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8158089 |
Compositions and methods for wastewater treatment
Particular aspects provide a method for recovering phosphate, comprising: obtaining an effluent or wastewater, etc. having calcium-sequestered phosphate; adding to the effluent or wastewater a...
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8034149 |
Process for obtaining a fertilizer with sustained release of phosphorus
The present invention relates to obtaining a fertilizer with sustained release of phosphorus, enriched with other macro and micronutrients, which can be produced by pyrolysis of pyrobituminous...
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7910080 |
Phosphorous pentoxide producing methods
A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of from 0.5 to 1.0 and maintaining a bed temperature at or above...
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7824634 |
Method for etching phosphate ores
A method for etching phosphate ores includes a single-pass digesting of ores which P205 content is greater than 20% in weight by a hydrochloric aqueous acid solution having an HCI concentration...
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7378070 |
Phosphorous pentoxide producing methods
A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of less than 1.0 and maintaining a bed temperature at or above...
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6451276 |
Recovery of elemental phosphorus from phosphorus sludge
Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the...
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6409978 |
Method of removing impurities from mineral concentrates
A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which...
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6251352 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Recovery of elemental phosphorus from phosphorus sludge
Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the...
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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...
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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....
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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...
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5500193 |
Method for ION exchange based leaching of the carbonates of calcium and magnesium from phosphate rock
This invention relates to the extraction of carbonates of magnesium and/or calcium with a strong hydrogen form cation-exchange resin from a phosphate rock composition in an aqueous slurry, wherein...
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5094680 |
Zeolite-activated guano phosphates and a method for producing the same
Zeolite-activated guano phosphate fertilizers are produced by a method comprising grinding guano phosphates to 10 mesh granules by roughing and middling mills, heating in a rotary kiln, cooling,...
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4919906 |
Processes and equipment for production of elemental phosphorus and thermal phosphoric acid
New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting...
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4798717 |
Production of elements and compounds by deserpentinization of ultramafic rock
Ultramafic rock material containing, or which is serpentinized so as to contain, substantially or completely serpentinized material, or alternatively, clay material containing structural water, is...
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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...
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4777026 |
Production of phosphates from alkali-processes phosphate rock
Process for production of desired phosphates from naturally occurring phosphates is characterized by treating naturally occurring phosphates under alkaline conditions to produce a material...
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4759920 |
Process for the manufacture of disodium phosphate
The present invention relates to a process for the manufacture of disodium phosphate of a high purity without utilizing organic solvents. According to the process, monosodium sulfate is reacted, at...
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4673555 |
Method for preparation of defluorinated phosphate
Phosphate rock is defluorinated by blending with phosphoric acid and a sodium defluorination reagent sufficient to give 5 to 9 percent Na2 O based on the weight of rock and a mole ratio of CaO plus...
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4609535 |
Extracting soluble phosphates from naturally occurring iron and aluminium phosphates using solutions of alkali metal carbonates and hydroxides
A process for production of alkali metal phosphates from material containing iron and aluminium phosphates comprises leaching the said material with alkali metal carbonate solution to produce a...
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T106801 |
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....
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4592900 |
Method of removing cadmium from raw phosphate
A method of removing cadmium from raw phosphate material in an apparatus comprising a preheater section (2,13) a reactor section (3,4,5), a cooler section (7) and an exit gas cleaning section...
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4577804 |
Wet grinding phosphate rock in an acidic slurry
Phosphate rock contained in an acidic slurry is ground by equipment wherein the acidic slurry contacts the metallic surfaces of the equipment. A method for monitoring and controlling grinding ball...
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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...
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4557909 |
Method to improve acidulation quality of North Carolina phosphate rock
Phosphate rock is heated under controlled conditions to essentially eliminate organic impurities and sulfides from the rock and subsequently leached with water to substantially increase the...
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4556548 |
Process for purifying wet-processed phosphoric acid
The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting...
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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...
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4555388 |
Method and apparatus for calcining raw phosphate material
Raw phosphate material is calcined to remove pollutants, such as organic compounds and sulphides, by heat treatment in two suspension calciners (3,5) arranged in series. Fuel supplied at burners...
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4511543 |
Method for beneficiation of phosphate rock
The present invention relates to a method for beneficiation of phosphate rock by a thermal treatment, wherein an appreciable increase in P2 O5 and decrease in cadmium contents in the calcined...
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4423015 |
Process of producing defluorinated product from low BPL phosphate rock
In a process for producing a defluorinated product containing calcium, sodium and phosphorus, by calcination of a mixture of phosphate rock, with caustic soda, phosphoric acid and water, an...
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4420466 |
Process for producing phosphorus pentoxide
A process for producing phosphorus pentoxide from phosphate ore includes the mixing and formulation of a feed mixture of phosphate ore with lime and solid carbonaceous material in amounts to...
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4389380 |
Multiple-stage thermal beneficiation process for phosphate ores
A multiple-stage thermal beneficiation process for phosphate ores which comprises calcining a phosphate ore in a first stage at a temperature sufficient to destroy substantial quantities of organic...
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4374817 |
Formulation of phosphate rock slurries
The viscosity of phosphate rock slurries is reduced by incorporating in the slurry both sodium tripolyphosphate and an alkaline material, particularly sodium hydroxide. The combined amount of these...
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4372929 |
Energy conservation and pollution abatement at phosphorus furnaces
A process and product of waste recovery at phosphorus furnaces is disclosed wherein small sized discrete particles of carbonaceous material or beneficiated phosphate ore are mixed with a mineral...
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4351809 |
Process for reducing phosphate ore
A process for reducing phosphate ore includes beneficiating phosphate ore to reduce alumina impurities while allowing fluoride impurities to remain in the beneficiated ore, mixing beneficiated ore...
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4321238 |
Process for high temperature phosphate ore burning
High temperature phosphate are burning process in which the ore is preheated by gases produced by the combustion of a fuel in the burning zone, and then enters the burning zone and is cooled by a...
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4304754 |
Fluid bed calcining apparatus
In order to increase or maintain the capacity of fluid bed calciners in the calcination of phosphate rock containng large amounts of organic matter ("hot rocks"), the calciner is modified to permit...
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4279635 |
Process for treating phosphatic clay suspensions
A process for treating thickened phosphatic clay suspensions produced in the processing of phosphate ore by water beneficiation, and which have a solids content of from about 5% to about 30%. A...
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4263262 |
Fluid bed calcining process
In order to increase or maintain the capacity of fluid bed calciners in the calcination of phosphate rock containing large amounts of organic matter ("hot rocks"), the calciner is modified to...
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4239523 |
Method 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...
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4177052 |
Process for preparing dicalcium phosphate containing fertilizer
There is disclosed a process for preparing fertilizers containing dicalcium phosphate from phosphates of mineral origin by mechanical activation. According to the invention grains larger than 5 mm...
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T988006 |
Chemical beneficiation of phosphatic limestone and phosphate rock with α-hydroxysulfonic acids
A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of...
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4151259 |
Use of oil-water emulsions in a hydrothermal process
This invention relates to hydrothermal processes, such as defluorination of phosphate rock, wherein the novel feature resides in the use of an emulsion of water and fuel oil.
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4113184 |
Wet grinding method for crude phosphate rock
This application discloses a method of wet grinding crude phosphate rock containing clay minerals and the like impurities. The procedures of the invention produce a rock slurry of enhanced fluidity...
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4106922 |
Alkaline 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...
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4083929 |
Beneficiation of phosphate rock
Beneficiation of phosphate rock containing limestone is accomplished by calcining, cooling, slaking and separation of the slaked lime from the phosphate rock product. The cooling, slaking and...
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4014682 |
Process for the production of elemental phosphorus and iron from phosphate rock
A process for the production of phosphorus from low-grade phosphate rock containing at least 5% by weight of each of iron and aluminum (calculated as their oxides) by heating a mixture of the rock,...
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4008309 |
Process for crystallizing calcium nitrate
Large-sized calcium nitrate tetrahydrate particles are obtained by dissolving phosphate rock in concentrated nitric acid, cooling the resulting solution, intentionally terminating the...
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4008315 |
Process for reducing nitrogen oxide losses from certain slurries and solutions by the addition of phosphate salts
Nitrous oxide losses are reduced by bringing acid to weakly alkaline salt solutions or suspensions into media containing nitrous oxide or media which develop nitrous oxide.
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3998929 |
Fluidized bed process
Hot gases for fluidizing the preheat compartment of a multi-bed fluid bed reactor are cooled by injection of water, or cool air and water, to reduce scaling of the ducts, hot cyclone, hot windbox...
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