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the production of fluoride free dicalcium phosphate
dicalcium phosphate process fluoride phosphoric acid
Monocalcium phosphate production process. Then the dried product is treated with phosphoric acid to obtain phosphate and again carry out the drying at a temperature of 145-170°C. the method can reduce the fluoride content in the product to 0.15-0.2% (A.S. USSR №1463733, CL 01 In 25/32, 1989).
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Production of dicalcium phosphate or monocalcium
2001-4-4 Production of dicalcium phosphate or monocalcium phosphate. A process is provided for the production of dicalcium phosphate form a phosphate source material in which a solution of phosphoric acid is produced by the action of a suitable mineral acid, generally sulphuric acid, on a phosphate source material. Calcium fluoride is precipitated at a ...
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Production of dicalcium phosphate or monocalcium
2003-4-4 FIELD OF THE INVENTION [0001] This invention relates to the production of dicalcium phosphate (Ca(H 2 PO 4) 2) or monocalcium phosphate (CaHPO 4) from a source of phosphate, generally a phosphate ore, and typically one containing a significant amount of fluoride.More particularly, the invention relates to process in which a high recovery of phosphate can be achieved whilst fluoride
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Fluoride and calcium release from peppermint-flavored ...
2021-9-27 Ample quantities of free fluoride and calcium ions in the oral cavity can enhance enamel remineralization. This study aimed to investigate the effect of dicalcium phosphate dihydrate coated with xylitol (DCPD-xylitol), in fluoride varnish, on the release of fluoride and calcium ions in the oral cavity.
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Production of dicalcium phosphate or monocalcium
Also, a method of producing monocalcium phosphate from calcium phosphate includes reacting the calcium phosphate with sulphuric acid to produce monocalcium phosphate. The monocalcium phosphate may be further processed to remove fluorine contamination and to produce fluorine-free dicalcium phosphate or dicalcium phosphate dihydrate.
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Method of producing fluoride-free phosphoric acid ...
Substantially fluoride-free phosphoric acid is produced by the acidulation of phosphate rock with sulfuric acid wherein the acidulation reaction is conducted in the presence of added potassium as K 2 O bearing compounds, e.g. KHSO 4, K 2 SO 4, KH 2 PO 4 or KOH, and additional silica, to precipitate fluorides and silica as potassium silicofluoride and then removed on separation of the gypsum ...
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Recovery of calcium fluoride from phosphate operation ...
The aqueous phase, after removal of the calcium fluoride, is treated with an additional 10% milk of lime to adjust the pH to between 4.7 and 5 to precipitate out dicalcium phosphate. Dicalcium phosphate is separated from the aqueous phase and is upgraded in a conventional dicalcium phosphate plant or cycled to a conventional wet acid phosphoric ...
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A PROCESS FOR THE MANUFACTURE OF FEED GRADE
Dicalcium phosphate known, as DCP is a commonly used animal feed supplement and it is desirable to obtain dicalcium phosphate free of contaminants, particularly fluoride containing compounds. Feed grade dicalcium phosphate has a chemical formula CaH PO4 2H2O wherein phosphorus expressed as P is 18% and calcium expressed as Ca is at least 23%.
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Study of fluoride content in some commercial phosphate ...
2018-6-1 The average fluoride levels in seven phosphate fertilizers were computed from the four sets of analytical studies carried out with 100 mg L −1 fertilizer solutions (Table 2, column B; Table 5; Table 6 (without blank correction)) and the data are presented in Table 7.The values varied from 0.140 ± 0.006–1.33 ± 0.158% (w/w) for the seven fertilizer samples.
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USP Monographs: Dibasic Calcium Phosphate
2014-9-5 Loss on ignition 733— Ignite it at 800 to 825 to constant weight: anhydrous Dibasic Calcium Phosphate loses between 6.6% and 8.5% of its weight, and the dihydrate form of Dibasic Calcium Phosphate loses between 24.5% and 26.5% of its weight. Carbonate— Mix 1.0 g with 5 mL of water, and add 2 mL of hydrochloric acid: no effervescence occurs.
Moredicalcium phosphate process fluoride phosphoric acid
Monocalcium phosphate production process. Then the dried product is treated with phosphoric acid to obtain phosphate and again carry out the drying at a temperature of 145-170°C. the method can reduce the fluoride content in the product to 0.15-0.2% (A.S. USSR №1463733, CL 01 In 25/32, 1989).
MoreFluoride and calcium release from peppermint-flavored ...
2021-9-27 Ample quantities of free fluoride and calcium ions in the oral cavity can enhance enamel remineralization. This study aimed to investigate the effect of dicalcium phosphate dihydrate coated with xylitol (DCPD-xylitol), in fluoride varnish, on the release of fluoride and calcium ions in the oral cavity.
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Fluoride-free phosphate reactions - Pennzoil Company
Substantially fluoride-free phosphoric acid is produced by the acidulation of phosphate rock with sulfuric acid wherein the acidulation reaction is conducted in the presence of added potassium as K 2 O bearing compounds, e.g. KHSO 4, K 2 SO 4, KH 2 PO 4 or KOH, and additional silica, to precipitate fluorides and silica as potassium silicofluoride and then removed on separation of the gypsum ...
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(PDF) THE PRODUCTION OF DI-CALCIUM PHOSPHATE FTY
THE PRODUCTION OF DI-CALCIUM PHOSPHATE FTY TEE DIRECT ACIDULATION OF PHOSPHATE ROCK by KUO.KANG FENG B. S., National Taiwan University, Taipeh, Taiwan, China, 1950 A TUESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Chemical Engineering KANSAS STATE COLLEGE OF AGRICULTURE AND APPLIED SCIENCE
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(PDF) Synthesis of di-calcium phosphate used as feed ...
for dicalcium phosphate production both acids used also lead to the enhancement of several . ... Analyses of all samples filtrate for fluoride were performed using Orion 5 Star, ... Join for free.
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manual removal of fluoride from dicalcium phosphate
manual removal of fluoride from dicalcium phosphate Phosphorus Removal by Orthophosphate Nucleation phosphate supersaturation, this study con cerned itself primarily with the formation of calcium phosphate solid phases. ... phate removal, reagent grade sodium fluoride, magnesium sulfate, and am monium chloride were added to the stock feed.
MoreA PROCESS FOR THE MANUFACTURE OF FEED GRADE
Dicalcium phosphate known, as DCP is a commonly used animal feed supplement and it is desirable to obtain dicalcium phosphate free of contaminants, particularly fluoride containing compounds. Feed grade dicalcium phosphate has a chemical formula CaH PO4 2H2O wherein phosphorus expressed as P is 18% and calcium expressed as Ca is at least 23%.
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(PDF) Basic Biological Sciences Hydrolysis of Dicalcium ...
Basic Biological Sciences Hydrolysis of Dicalcium Phosphate Dihydrate in the Presence or Absence of Calcium Fluoride January 1985 Journal of Dental Research 64(1):2-5
MoreUSP Monographs: Dibasic Calcium Phosphate
2014-9-5 Loss on ignition 733— Ignite it at 800 to 825 to constant weight: anhydrous Dibasic Calcium Phosphate loses between 6.6% and 8.5% of its weight, and the dihydrate form of Dibasic Calcium Phosphate loses between 24.5% and 26.5% of its weight. Carbonate— Mix 1.0 g with 5 mL of water, and add 2 mL of hydrochloric acid: no effervescence occurs.
MoreStudy of fluoride content in some commercial phosphate ...
2018-6-1 The average fluoride levels in seven phosphate fertilizers were computed from the four sets of analytical studies carried out with 100 mg L −1 fertilizer solutions (Table 2, column B; Table 5; Table 6 (without blank correction)) and the data are presented in Table 7.The values varied from 0.140 ± 0.006–1.33 ± 0.158% (w/w) for the seven fertilizer samples.
Moredicalcium phosphate process fluoride phosphoric acid
Monocalcium phosphate production process. Then the dried product is treated with phosphoric acid to obtain phosphate and again carry out the drying at a temperature of 145-170°C. the method can reduce the fluoride content in the product to 0.15-0.2% (A.S. USSR №1463733, CL 01 In 25/32, 1989).
More(PDF) THE PRODUCTION OF DI-CALCIUM PHOSPHATE FTY
THE PRODUCTION OF DI-CALCIUM PHOSPHATE FTY TEE DIRECT ACIDULATION OF PHOSPHATE ROCK by KUO.KANG FENG B. S., National Taiwan University, Taipeh, Taiwan, China, 1950 A TUESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Chemical Engineering KANSAS STATE COLLEGE OF AGRICULTURE AND APPLIED SCIENCE
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Method of producing dicalcium phosphate
The prototype of the claimed invention is a method of producing dicalcium phosphate /patent RF №2411222, publ. 10.02.2011, application No. 2009109920/includes mixing phosphoric acid with limestone at 60-80°C bereturned with subsequent maturation and drying of the product flue gases at 120-145°C. to a residual moisture content of 1.5-2.5%, characterized in that the mixture of lead in two ...
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Fluoride Action Network The Phosphate Fertilizer ...
Fluoride has been, and remains to this day, one of the largest environmental liabilities of the phosphate industry. The source of the problem lies in the fact that raw phosphate ore contains high concentrations of fluoride, usually between 20,000 to 40,000 parts per
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(PDF) SYNTHESIS OF DICALCIUM PHOSPHATE USED AS
The best values in terms of quality and quantity of dicalcium phosphate from locally phosphate rock were achieved at acid concentration of 10% w/w, reaction time of 1.5 hrs, at 30°C and pH values of 2.3-2.4 (during precipitation of impurities) and 5.5-5.6 (for the final synthesis of dicalcium phosphate).
MoreChlorophosphate Process For Dicalcium Phosphate
Process for the production of dicalcium phosphate Fox. The process for producing dicalcium orthophosphate comprising heating monocalcium 50 chlorophosphate, substantially free of calcium chloride, in the presence of steam, in amounts sufficient substantially to prevent the formation of calcium pyrophosphate and to support decomposition of the monocalcium chlorophosphate to 55 hydrochloric
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The cariostatic mechanisms of fluoride
mineral components, and fluoride ions (21). The solid phase of enamel consists mainly of crystallized calcium phosphate, which per-sists in different forms (mainly as hydroxy-apatite and some less stable forms such as dicalcium phosphate dihydrate (DCPD), brushite or octacalcium phosphate (OCP). The mineral component of human dental
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DCP DiCalcium Phosphate poultry Feed Grade-DCP18%
2017-11-23 Dicalcium Phosphate poultry feed grade is an organic weight loss plan of mineral phosphate due to the fact bones meal and meat usually are not allowed in poultry industries. Dicalcium Phosphate makes use of as nutritional complement diets with
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Di-calcium phosphate by direct acidulation of phosphate
2020-10-13 mono-calcium phosphate and undecomposed phosphate rock result in practice. Acidulation to di-calcium phosphate is of considerable interest since less sulfuric acid would be required, thereby lowering production costs. In addition, di-calcium phosphate has many desirable properties as
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Method of Analysis for Dibasic Calcium Phosphate
2 天前 Fluoride standard solution (10 ppm F) Procedure: Introduce into the inner tube of the apparatus the specified 0.5 g sample 0.1 g of acid-washed sand and 20 ml of sulphuric acid (50% v/v). Place tetrachloroethane in the outer jacket and heat to maintain at its boiling point (146°).
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