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01/09/2002 Wet-process phosphoric acid contains a number of undesirable ionic impurities, like fluorine, sulphate, aluminium, iron, and other metals originally present in the phosphate rock. The impurities interfere in the technological process of making phosphoric acid and/or liquid fertiliser. They also precipitate while the acid is concentrated or stored. Without previous treatment, the acid cannot
A process has been proposed for the treatment of apatite concentrate obtained from the dephosphorization of iron ore. In this process, the apatite is acidulated by HNO 3 to produce high‐purity H 3 PO 4.The crude acid obtained is shown to be at least equivalent to, if not better than, the typical wet‐process acid.
decomposition process of Khibin apatite under conditions of wet- process phosphoric acid production by the hemihydrate method. Russ. J. Appl. Chem . 1990 , 63 (No. 11), 2463 - 2467.
1 direct flotation process Direct flotation use effective inhibitor to control gangue mineral and collector to concentrate phosphorus in foam It is suitable for low grade phosphorus ore including magmatic rock type apatite and deposition metamorphic type apatite 2 reverse flotation process Mainly used for separation of phosphorus and. Read More
method is a wet process. We also provide an overview of the applications of the molecular precursor method for coating apatite onto three-dimensional titanium fiber web. The molecular precursor method is herein introduced as a useful apatite coating technique. THIN CA COATING USING MOLECULAR PRECURSOR METHOD The molecular precursor method was applied to produce thin CA coatings
Manufacture of Wet-Process . The reactions in the digestion of apatite with sulfuric acid are complex. The calcium phosphate portion of apatite reacts with sulfuric acid as follows: whereupon, depending upon the process conditions, the calcium sulfate precipitates either as its dihydrate or as its hemihydrate (see below). The "fluoride part" of ...
The importance of the maturation time or aging time in solution is related to the process of formation of apatites involving intermediate nonapatitic phases and/or nonstoichiometric apatite precursors. Aging is associated with an evolution of the apatite toward more stable less soluble ones. Different processes seem, however, to be involved depending on the type of apatites. Three types of ...
Example of phosphoric acid production. Wet process phosphoric acid is prepared by adding sulfuric acid (H 2 SO 4) to apatite or tricalcium phosphate rock resulting in the following reaction: . 3 H 2 SO 4 + Ca 3 (PO 4) 2 + 6 H 2 O ↔ 2 H 3 PO 4 + 3 CaSO 4 •2H 2 O . Wet-process acid has to be purified by removing fluorine and other undesirable elements to produce feed-grade phosphoric acid.
Give in to the inspirational qualities of the Apatite crystal stone and encourage a peaceful respite from the confusion that comes from adulting in the modern world. The Apatite crystal stone helps to reawaken a sense of clarity that lights the path to self-expression. It gives us the guidance we need to maintain the delicate balancing act ...
A process has been proposed for the treatment of apatite concentrate obtained from the dephosphorization of iron ore. In this process, the apatite is acidulated by HNO 3 to produce high‐purity H 3 PO 4.The crude acid obtained is shown to be at least equivalent to, if not better than, the typical wet‐process acid.
as the wet process. In the wet process, phosphoric acid is produced by the digestion of high-grade phosphate rock, e.g., apatite, using sulfuric acid, followed by filtration and subsequent vacuum concentration [5]. Presently, at least one enhanced thermal process, the Improved Hard Process (IHP), is therefore being commercialized [6, 7].
The present invention relates to a process for preparing apatite and more particularly to a process for preparing a calcium-phosphorus apatite. ... Wet process involving reacting a water-soluble phosphate with a water-soluble calcium salt in an aqueous solution at 37° C. and at a pH value of 7-8 for at least 20 days to obtain Ap having an approximately stoichiometric ratio. However, in both ...
28/06/2015 Apatite ; Value addition Two processes are in practice to convert rock phosphate into more effective forms Wet process Thermal process Wet process is quite simple Single Super Phosphates Ca3(PO4)2 + 2H2SO4 Ca(H2PO4)2 + 2CaSO4 17.
Vol. 7, No. 4, 2004 Synthesis Control and Characterization of Hydroxyapatite Prepared by Wet Precipitation PMaterials Research, Vol. 7, No. 4, 625-630, 2004. rocess 625© 2004 *e-mail: [email protected] Article presented at the II SBPMat, Rio de Janeiro - RJ, 26-29 de Outubro/ 2003 Synthesis Control and Characterization of Hydroxyapatite Prepared by Wet Precipitation Process
As the stoichiometric ratio of phosphorous acid and apatite is increasing, the number of sulphates is decreasing. The smallest amount of sulphates (0,02 %) was determined at stoichiometric ratio EPA:KA=1:1,5. The effectiveness of desulfurization process is affected a lot by temperature. It is attempted to achieve the biggest effectiveness of desulfurization and extraction process with the ...
The present invention relates to a method of preparing wet process phosphoric acid, which comprises: dividing raw materials which contain phosphate rock slurry and sulfuric acid into two parts, and then feeding these two parts into two reactors separately. In the first reactor, feeding 70–90 wt. % of the total amount of the slurry and sulfuric acid, in which the ratio of phosphate rock ...
Wet chemical process based on chemical precipitation is the most convenient and commonly used process for HAp fabrication. This process is very simple and easy to use, offering a molecular level mixing of calcium and phosphorus precursors to improve the chemical homogeneity of the product, apart from reducing synthesis temperature. The precipitation technique has been developed and used to ...
Apatite Properties. Apatite is a calcium phosphate and quite a rare tourmaline variety. It comes in many colors and forms, and it’s often confused with many other minerals, such as Aquamarine and Fluorite. It can be opaque, translucent, or transparent. Its colors range from white to greenish yellow, brown and violet! In recent times blue ...
apatite mining and processing . Inicio; apatite mining and processing; Christmas special! Limited time offer, price concessions, up to 66%, come and consult!Inquiry. Clasificador Espiral . Como parte importante de la línea de beneficio, clasificadores Live Online. Rating : 4.9/5 (123) Views. $199?? $29999. Criba de Alta Frecuencia . En comparación con los equipos de clasificación y ...
The present invention relates to a process for preparing apatite and more particularly to a process for preparing a calcium-phosphorus apatite. ... Wet process involving reacting a water-soluble phosphate with a water-soluble calcium salt in an aqueous solution at 37° C. and at a pH value of 7-8 for at least 20 days to obtain Ap having an approximately stoichiometric ratio. However, in both ...
28/06/2015 Apatite ; Value addition Two processes are in practice to convert rock phosphate into more effective forms Wet process Thermal process Wet process is quite simple Single Super Phosphates Ca3(PO4)2 + 2H2SO4 Ca(H2PO4)2 + 2CaSO4 17.
A calcium-phosphorus apatite is obtained by reacting a calcium compound with a phosphorus compound under reflux in a reaction medium consisting mainly of an organic solvent and water. US4481175A - Process for preparing apatite - Google Patents Process for preparing apatite Download PDF Info Publication number US4481175A . US4481175A ...
Vol. 7, No. 4, 2004 Synthesis Control and Characterization of Hydroxyapatite Prepared by Wet Precipitation PMaterials Research, Vol. 7, No. 4, 625-630, 2004. rocess 625© 2004 *e-mail: [email protected] Article presented at the II SBPMat, Rio de Janeiro - RJ, 26-29 de Outubro/ 2003 Synthesis Control and Characterization of Hydroxyapatite Prepared by Wet Precipitation Process
The method for extracting rare earth elements from wet-process phosphoric acid (EPA) during the processing of the Khibiny Apatite concentrates, including sorption, carried out in the temperature range 40-80°C, rinse the sum of the saturated redkozemel the s elements of the sorbent, desorption of obtaining trademark decorate, characterized in that the sorbent is used strongly acid macroporous ...
Apatite coated article and process for producing the same . United States Patent 5128146 . Abstract: An apatite coated article comprising a substrate having thereon an apatite layer which is formed by flame spraying apatite powder at from about 2,000° to 4,000° C., and a process for producing such an apatite coated article. Inventors: Hirayama, Yasuhiko (Tokyo, JP) Ikata, Haruko (Tokyo, JP ...
As the stoichiometric ratio of phosphorous acid and apatite is increasing, the number of sulphates is decreasing. The smallest amount of sulphates (0,02 %) was determined at stoichiometric ratio EPA:KA=1:1,5. The effectiveness of desulfurization process is affected a lot by temperature. It is attempted to achieve the biggest effectiveness of desulfurization and extraction process with the ...
Synthesis control and characterization of hydroxyapatite prepared by wet precipitation process . ... Furthermore, according to the literature 4, calcium phosphates are broadly used in medicine and oral biology due to the apatite-like structure of enamel, dentin and bones, usually called "hard tissues". To date, in spite of availability of several sophisticated characterization techniques for ...
• Sulfuric acid treatment process of bones and P minerals (apatite) was patented in mid 1800s. • Today most P fertilizer production is based on acidification of apatite. from phosphate rock (PR) Guano mining, Chincha Islands, Peru, 1860 Guano mining, Chincha Islands, Peru 1860 U.S. phosphate operation, late 1800s. The chemical symbol for the element phosphorus is P. The fertilizer industry ...
apatite mining and processing . Inicio; apatite mining and processing; Christmas special! Limited time offer, price concessions, up to 66%, come and consult!Inquiry. Clasificador Espiral . Como parte importante de la línea de beneficio, clasificadores Live Online. Rating : 4.9/5 (123) Views. $199?? $29999. Criba de Alta Frecuencia . En comparación con los equipos de clasificación y ...
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