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phosphate rock defluorination

  • Mechanochemical activation in manufacture of defluorinated .

    The effect of preliminary mechanochemical activation of phosphate rock on the temperature of hydrothermal calcination and degree of defluorination in manufacture of defluorinated forage phosphates conforming to GOST (State Standard) 23 999–80 was studied. A mechanism of mechanochemical activation of phosphate raw materials, associated with changes in thermodynamic .

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  • US2478200A - Defluorination of phosphate rock - Google Patents

    US2478200A US665346A US66534646A US2478200A US 2478200 A US2478200 A US 2478200A US 665346 A US665346 A US 665346A US 66534646 A US66534646 A US 66534646A US 2478200 A US2478200 A US 2478200A Authority US United States Prior art keywords phosphate silica nodules rock water vapor Prior art date 1946-04-26 Legal status (The legal status is an assumption and is not .

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  • Federal Register :: Phosphoric Acid Manufacturing and .

    The basic step for producing phosphoric acid is acidulation of phosphate rock. Typically, sulfuric acid, phosphate rock, and water are combined together and allowed to react to produce phosphoric acid and gypsum. When phosphate rock is acidulated to manufacture wet-process phosphoric acid (WPPA), fluorine contained in the rock is released.

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  • Dutton v. Rocky Mountain Phosphates :: 1968 :: Montana .

    The defendant's President, Bryce Rhodes, is admittedly an expert in the United States on the processing or defluorination of phosphate rock and also expert with relation to the emission of fluorine from the process and its subsequent effect on livestock and growing crops.

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  • Phosphoric Acid - Chemical Economics Handbook (CEH) | IHS .

    Consumption of phosphoric acid for its acid properties is relatively small (e.g., treatment of metal surfaces, beverage acidulation). Phosphoric acid is the leading intermediate product or processing step between phosphate rock and the end markets for phosphorus in phosphate form. The supply/demand balance for phosphoric acid is supply driven.

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  • Defluorinated rock phosphate as a source . - Cambridge Core

    Mar 27, 2009 · Defluorination of rock phosphate by heat treatment is an important method of producing phosphates suitable for animal feed. A variety of such products have been evaluated as phosphorus sources for ruminants, e.g. Beeson et al. (1945) recorded that a material produced at a low temperature (600°C) was unsatisfactory for steers, but Ammerman et al. (1957) indicated that a calcined calcium .

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  • Production of defluorinated dicalcium phosphate from .

    Oct 15, 2004 · A new process to produce defluorinated dicalcium phosphate (DCP) using phosphate rock concentrate has been developed. This new process has as main characteristic the low concentration of P2O5 in the liquid phase. The process comprises three main steps: solubilization of the phosphate rock concentrate with sulfuric acid, defluorination of the phosphoric acid solution with .

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  • Defluorinated Phosphoric Acid - Industrial Wastes

    The major wastewater source in the defluorination processes is the wet scrubbing of contaminants from the gaseous effluent streams. . Figure 4 Defluorinated phosphate rock fluid bed process (from Ref. 8). Figure 5 Defluorinated phosphoric acid vacuum process (from Ref. 8). Was this article helpful? 0 0.

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  • Phosphate Rock Hydrochloric Acid | Cromalinsupport

    The hydrochloric acid route for phosphate rock The hydrochloric acid route for phosphate rock Habashi, Fathi; Awadalla, Farouk T.; Yao, Xin‐Bao 1987-01-01 00:00:00 When phosphate rock is leached with hydrochloric acid, radium can be removed by co‐precipitation with Ba0.4Ca0.6SO4 and uranium by extraction with a 5% solution of tributyl .

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  • Borden, Inc. v. Occidental Petroleum Corporation, 381 F .

    The phosphate rock used in the soda-acid process had a silica content of 2-6%, a range which raises the fusion temperature of phosphate rock mixtures to be defluorinated, allowing the calcining operation to proceed at a higher temperature with an attendant higher rate of defluorination. *1199 Invalidity Under 35 U.S.C. § 112. 76.

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  • Phosphoric acid production by attacking phosphate rock .

    During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation .

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  • Development of fused phosphate fertilizers

    Defluorination may also be accomplished by thermal treatment of phosphate rock in the presence of silica and water vapor without fusion (30, 1, ^2, ^3, 6^), 3» Fusion with addition agents. The phosphate rock may be fused with certain addition agents to form a .

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  • Rock phosphate | Feedipedia

    Rock phosphates from some areas (e.g., Curacao) are low in fluorine, whereas those from other areas must be defluorinated before they can be used. Defluorination of rock phosphate is an industrial process that is suitable only for large-scale production. Rock phosphate contains about 17% phosphorus and 34% calcium.

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  • Upgrading Phosphate Ores with Rotary Kilns

    Defluorination is carried out via calcination in a rotary kiln, which drives off the fluorine components and also makes the phosphorus bio-available. 1. Nodulizing. While most phosphate rock is destined for phosphoric acid production, some phosphate rock is converted into elemental phosphorus in a furnace.

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  • NIOSHTIC-2 Publications Search - 10007776 - Fluorine .

    The Bureau of Mines continued its research into the recovery of fluorine by the phosphoric acid acidulation defluorination of phosphate rock concentrates. A small process development unit with a capacity of about 10 kilograms of charge per hour was operated, and concentrates from both Idaho and Florida were processed.

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  • Determination of source and distribution of P2O5 in triple .

    rock phosphate to available P2O5 ^ 13. 20): (1) acldulatlon of rock phosphate with mineral acids, principally sulfuric and phosphoric, which resiats in prod­ ucts known as superphosphates, and (2) thermal decomposition of apatite which results in (a) defluorination of the rock, or (b) formation of glassy

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  • Phosphoric acid production by attacking phosphate rock .

    During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation .

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  • (,1 2 1/,1( - US EPA

    storage facilities at phosphate rock plants with a maximum production rate greater than 3.6 megagrams of rock per hour (4 tons/hr). The promulgated standards will limit emissions of particulate matter to 0.03 kilogram (kg)' per megagram (Mg) of rock feed (0.06 lb/ ton) from phosphate rock dryers, 0.12 kg/Mg (0.23 lb/ton) from phosphate rock

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  • THIN FILM DEFLUORINATION OF PHOSPHATE ROCK - Patent .

    Defluorination of phosphate rock is carried out by introducing seed particles into a fluid bed reactor and a fluidizing gas to establish a fluidized bed therein; gradually introducing phosphate rock feed liner than about 35 mesh at a point below the top of the fluid bed; continue introducing the phosphate rock feed to establish a fluidized bed containing seed particles at least some of which .

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  • Borden, Inc. v. Occidental Petroleum Corporation, 381 F .

    The phosphate rock used in the soda-acid process had a silica content of 2-6%, a range which raises the fusion temperature of phosphate rock mixtures to be defluorinated, allowing the calcining operation to proceed at a higher temperature with an attendant higher rate of defluorination. *1199 Invalidity Under 35 U.S.C. § 112. 76.

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  • Development Document For Effluent Limitations Guidelines .

    The Phase I phosphate study covered the production of phosphorus, and products derived from phosphorus. This Phase II study covers phosphate chemicals produced by the defluorination of phosphate rock, the defluorination of phosphoric acid, and the sodium phosphates produced from wet process phosphoric acid.

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  • (PDF) The Removal of Fluorine from Wet Process Phosphoric Acid

    In the nitric acid leaching of phosphate rock 20 kg of barium nitrate can be added to the leach solution followed by 20 kg of potassium sulfate per tone rock to produce 23 kg of a precipitate .

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  • production of dicalcium phosphate from rock phosphate

    Phosphate rock minerals are the only significant global resources of phosphorus. The United States is the world's leading producer and consumer of phosphate rock, which is used to manufacture phosphate fertilizers and industrial products. Subscribe to receive an email notification when a publication is added to this page. Monthly Publications .

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  • NIOSHTIC-2 Publications Search - 10007776 - Fluorine .

    The Bureau of Mines continued its research into the recovery of fluorine by the phosphoric acid acidulation defluorination of phosphate rock concentrates. A small process development unit with a capacity of about 10 kilograms of charge per hour was operated, and concentrates from both Idaho and Florida were processed.

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  • Method for defluorinating wet process phosphoric acid - Justia

    A method for defluorinating wet process phosphoric acid. Phosphatic waste clay from phosphate rock beneficiation is mixed with the wet process phosphoric acid. The mixture is heated for a time sufficient to remove fluorine from the acid as gaseous silicon tetrafluoride. Phosphate is liberated from the phosphatic waste clay and thus is recovered in the defluorinated wet process phosphoric acid.

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  • Process Of Calcination Of Phosphate Rock

    Process of calcination of phosphate rock | Solution for calcination and grinding can be accomplished simultaneously and,in such a case,no recovery rate phosphate beneficiation process; rock phosphate beneficiation Phosphorite – Wikipedia, the free encyclopedia.

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  • for feeding purposes (1). It is known that natural .

    It is known that natural phosphate rock can be made satisfactory for animal feeding by various processes of defluorination (1), (2), (3). A considerable number of phosphate products thus prepared, either experimentally in pilot plants or in large amounts by .

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  • Determination of source and distribution of P2O5 in triple .

    rock phosphate to available P2O5 ^ 13. 20): (1) acldulatlon of rock phosphate with mineral acids, principally sulfuric and phosphoric, which resiats in prod­ ucts known as superphosphates, and (2) thermal decomposition of apatite which results in (a) defluorination of the rock, or (b) formation of glassy

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  • Phosphate in a sentence (esp. good sentence like quote .

    Phosphate in a sentence up(0) down(0) . 67 Feed-grade calcium hydrogen phosphate was prepared by defluorination and neutralization method with wastewater in phosphate fertilizer plant, . 75 The calcium carbonate content of phosphate rock determines the pore structure.

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  • By: Andre Boucaut – SGL Carbon Defluorination Systems .

    As the phosphate rock contains always scaling agents this step is suffering by heavy scaling. Production cycles, maintenance and cleaning time are of most importance for the production performance. In case purified acid is required an acid purifaction, reconcentration and defluorination step follows the concentration step.

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