phosphate rock defluorination

Defluorination of phosphate rock - CORONET PHOSPHATE
Defluorination of the raw phosphate rock to make it available as a plant food or fertilizer and suitable as a mineral supplement in animal feed has engaged the attention of phosphate 5 producers for many years. In recent times the matter has assumed particular importance due to the shortage of bone meal as a mineral supplement and a shortage of ...
دردشة على الإنترنت
FLUIDIZED BED DEFLUORINATION OF PHOSPHATE ROCK -
I claim 1. Process for defluorinating fluorine-containing phosphate rock which comprises blowing such phosphate rock having a particle size of less than about 6 mesh (Tyler Standard) into a fluidized reactor bed below the upper surface thereof, separately but concurrently introducing phosphoric acid in the form of spray into the bed below the upper surface thereof, and
دردشة على الإنترنت
Production of defluorinated dicalcium phosphate from ...
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 P 2 O 5 in the liquid phase. The process comprises three main steps: solubilization of the phosphate rock concentrate with sulfuric acid, defluorination of the
دردشة على الإنترنت
Clean process for the production of defluorinated ...
1994-4-1 · A new process for the production of defluorinated dicalcium phosphate using phosphate rock was developed. This new process has the main characteristic of being clean, without the production of any liquid waste. The process has essentially three main steps: phosphate rock digestion, defluorination and neutralization.
دردشة على الإنترنت
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 Na 2 O based on the weight of rock and a mole ratio of CaO plus Na 2 O to P 2 O 5 of 3.00, granulating the blend and introducing the blend into a fluidized bed calcination apparatus having at least a first and second reaction zone, each zone
دردشة على الإنترنت
Mechanochemical activation in manufacture of
The effect of preliminary mechanochemical activation of phosphate rock on the temperature of hydrothermal calcination and degree of defluorination in
دردشة على الإنترنت
Mechanochemical activation in manufacture of
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
دردشة على الإنترنت
(PDF) Production of Molten Defluorinated Phosphates in a ...
2003-11-8 · The method involves melting raw phosphate ores (phosphate rock, apatite, etc.) in a SCM with certain additives (phosphoric acid, sand,
دردشة على الإنترنت
Aluminium phosphate for the defluorination of potable ...
1992-1-1 · Environment International, Vol. 18, pp. 307-310, 1992 0160-4120/92 $5.00 +.00 Printed in the U.S.A. All rlghu reserved. C~yright ~ 1992 Pergamon Press Ltd. ALUMINIUM PHOSPHATE FOR THE DEFLUORINATION OF POTABLE WATER Zhang Qianjie Beijing Geological Engineering Exploration Institute, Beijing, P.R. China Liang Hanwen* Institute of
دردشة على الإنترنت
The Removal of Fluorine from Wet Process Phosphoric Acid
In fact, this deposit is a by-product of a series of chemical reactions which begin with the initial reaction between natural phosphate rock and sulfuric acid which produces the phosphoric acid ...
دردشة على الإنترنت
Defluorination of Phosphate Rock in the Molten State ...
2019-11-6 · Production of Fertilizer from Phosphate Rock. Industrial & Engineering Chemistry 1953 , 45 (3) , 646-652. DOI: 10.1021/ie50519a049.
دردشة على الإنترنت
Clean process for the production of defluorinated ...
A new process for the production of defluorinated dicalcium phosphate using phosphate rock was developed. This new process has the main characteristic of being clean, without the production of any liquid waste. The process has essentially three main steps: phosphate rock digestion, defluorination and neutralization.
دردشة على الإنترنت
Mechanochemical activation in manufacture of
The effect of preliminary mechanochemical activation of phosphate rock on the temperature of hydrothermal calcination and degree of defluorination in
دردشة على الإنترنت
Production of defluorinated dicalcium phosphate from ...
2004-10-15 · 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
دردشة على الإنترنت
(PDF) Production of Molten Defluorinated Phosphates in a ...
2003-11-8 · The method involves melting raw phosphate ores (phosphate rock, apatite, etc.) in a SCM with certain additives (phosphoric acid, sand,
دردشة على الإنترنت
Mechanochemical activation in manufacture of
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
دردشة على الإنترنت
Phosphate Rock Fluorine Removal - 911metallurgist
2021-2-16 · Simplot Phosphate Rock. Through the courtesy of E. W. Hansen, former manager of the Simplot Fertilizer Co., Pocatello, Idaho, the Bureau of Mines was furnished with a carload of phosphate rock for pilot-plant defluorination tests. The carload comprised two lots, one being high-grade phosphate rock and the other phosphate shale.
دردشة على الإنترنت
Phosphates – it's all in the chemistry - All About Feed
2003-12-1 · The rock phosphate is first digested with sulphuric acid, yielding phosphoric acid. After further filtration, purification and defluorination steps, this “feed grade” phosphoric acid is reacted with a calcium source such as quicklime and/or limestone under strictly controlled conditions. Thus, anhydrous dicalcium phosphate (CaHPO4) is formed.
دردشة على الإنترنت
The Removal of Fluorine from Wet Process Phosphoric Acid
In fact, this deposit is a by-product of a series of chemical reactions which begin with the initial reaction between natural phosphate rock and sulfuric acid which produces the phosphoric acid ...
دردشة على الإنترنت
Iranian Phosphate Rock Dehydration Screen Use Process
Dec 03 1974 · The invention is a process for the manufacture of highly citrate soluble phosphatic materials containing at least 18 P and not more than 018 F and involves the thermal defluorination of phosphate rock analyzing between 68 and 74 BPL BPL bone phosphate of lime or Ca 3 PO 4 2 equivalent to P 2 O 5 content of the rock Such phosphate ...
دردشة على الإنترنت
Defluorination of Phosphate Rock in the Molten State ...
2019-11-6 · Production of Fertilizer from Phosphate Rock. Industrial & Engineering Chemistry 1953 , 45 (3) , 646-652. DOI: 10.1021/ie50519a049.
دردشة على الإنترنت
Mechanochemical activation in manufacture of
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
دردشة على الإنترنت
Production of defluorinated dicalcium phosphate from ...
2004-10-15 · 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
دردشة على الإنترنت
eCFR :: 40 CFR Part 422 -- Phosphate Manufacturing Point ...
§ 422.40 Applicability; description of the defluorinated phosphate rock subcategory. The provisions of this subpart are applicable to discharges resulting from the defluorination of phosphate rock by application of high temperature treatment along with wet process phosphoric acid, silica and other reagents.
دردشة على الإنترنت
Mono / Di Calcium Phosphate (MCP/ DCP)
2022-1-21 · Defluorination. This is usually done by stripping fluoride as SiF 4 by addition of silica or siliceous materials. Precipitation of a fluoride salt like Na 2 SiF 6, CaF 2, etc. Using defluorinated phosphoric acid or defluorinated phosphate rock (DFP). Desulfatation . Excess of sulfates (sulfuric acid) is reacted with phosphate rock or calcium ...
دردشة على الإنترنت
Evaluation of Control Technology for the Phosphate ...
6.6.6 Phosphate Rock Calcination Defluorination of phosphate rock through precalcination prior to acidulation with sulfuric acid occurs in two regimes. At low temperatures (up to 2000° F) 66% of the fluorine is removed, while heating to fusion temperature (2500°F) achieves 90% removal.
دردشة على الإنترنت
DeFluoridation
2014-3-26 · Fluoride typically occurs in the earths crusts as fluorspar(CaF2),cryolite (Na3AlF6), apatite(Ca5(PO4)3F), rock phosphate, mica, and hornblende. Rarely found outsid of it's iconic form (fluoride) Fluorine is the most electronegative element and is extremely reactive. Fluoride leaches off minerals and into groundwater. Worldwide the negative impact is increasing.
دردشة على الإنترنت
7757-93-9 - ChemBK
2022-1-1 · no filtration, no defluorination, one-stage neutralization method: phosphate rock powder of 40~80 mesh and 15% ~ 20% hydrochloric acid are metered and then added to the extractor with stirring, and the phosphate rock powder reacts with hydrochloric acid to generate phosphoric acid and calcium chloride, after the reaction, the liquid overflow into the neutralizer
دردشة على الإنترنت
The Removal of Fluorine from Wet Process Phosphoric Acid
In fact, this deposit is a by-product of a series of chemical reactions which begin with the initial reaction between natural phosphate rock and sulfuric acid which produces the phosphoric acid ...
دردشة على الإنترنت
Role of Phosphorus in Poultry | Benison Media
2021-6-26 · Usage of rock phosphate shouldensure that it had less than 0.5% fluorine. Dicalcium phosphate (DCP):Rock phosphate is digested with sulphuricacid, yielding phosphoric acid. After filtration, purification and defluorination, this feed grade phosphoric acid is reacted with quick lime or limestone. Thus, anhydrous dicalcium phosphate (DCP) is formed.
دردشة على الإنترنت