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Biological Properties and Medical Applications of Carbonate …

The biological properties and medical applications of carbonate apatite (CO 3 Ap) are discussed and evaluated. The majority of articles demonstrated that CO 3 Ap …

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Mechanism of apatite formation on a poorly crystallized …

The formation process of apatite on both the immature and the mature biomimetic PCA powders as substrates consists of three steps, whose durations seem independent on their physicochemical features, under physiological conditions. ... Physico-chemical and thermochemical studies of the hydrolytic conversion of amorphous …

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A novel process for the fabrication of nanoporous apatites …

Naturally-abundant Moroccan phosphate (Bengurir ores) was used as a source for calcium and phosphorus precursors for the synthesis of nanoporous apatites, following a dissolution–precipitation method. The influence of temperature, ripening time and solvent nature on the crystal growth of apatite was investigated.

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Review of the Main Factors Affecting the Flotation of Phosphate …

The H2 PO4 − species in the suspension occupies apatite's active sites and leads to a poor recovery. Therefore, inorganic acids are considered effective depressants with phosphoric acid being the most used as it does not cause any complication during the enrichment process. Phosphate salts can depress apatite, as well.

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Effect of process parameters on phosphorus conversion …

Phosphorus (P) is an essential nutrient for modern agriculture and food production. In the last century, P-based fertilizers have been affected by a growing demand related to the world's population growth [1], [2].Nowadays, P-fertilizer production primarily depends on P extraction from natural deposits of phosphate minerals (apatite rocks) …

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Apatite Formation on α-Tricalcium Phosphate …

Bioresponsive ceramics, a new concept in ceramic biomaterials, respond to biological molecules or environments, as exemplified by salts composed of calcium ions and phosphate esters (SCPEs). SCPEs have been shown to form apatite in simulated body fluid (SBF) containing alkaline phosphatase (ALP). Thus, surface modification with …

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Mechanism of apatite formation on a poorly crystallized …

The formation process of apatite on both the immature and the mature biomimetic PCA powders as substrates consists of three steps, whose durations seem …

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Fluoride-incorporated apatite coating on resin-based …

Mineral was octacalcium phosphate or fluoridated apatite depending on the medium. ... The LAB process for 3 min formed precipitates with different morphologies on the surface of the ICG-precoated RBC substrate, depending on the laser power and the type of CaP solution. Fig. 2 (left) shows an SEM image of the pristine RBC surface, …

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Reagents used in the flotation of phosphate …

Phosphate/apatite Aluminum sulfate and sodium, potassium tartrate Smani et al. (1975) ... For native gold recovery, by froth flotation as a process of mineral concentration, it is necessary to ...

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Apatite Formation: Why It May Not Work as Planned, and …

Synthetic-calcium-phosphate-apatite-based compounds are frequently encountered in the literature dealing with bone tissue engineering. ... In this view, pH …

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Enhancement of Apatite-Phosphorus-Rich Biochar …

Inorganic phosphorus can be further subdivided into non-apatite inorganic phosphorus (NAIP), associated with Al/Fe, and apatite phosphorus (AP); AP exhibits greater bioavailability than NAIP (Jiang et al., 2012). ... the specific reactions of inorganic phosphate in the pyrolysis process may proceed as follows (Li et al., 2023): (1) ...

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Fluoride-incorporated apatite coating on resin-based …

The LAB process for 3 min formed precipitates with different morphologies on the surface of the ICG-precoated RBC substrate, depending on the laser power and the type of CaP solution. ... Roles of fluoride on octacalcium phosphate and apatite formation on amorphous calcium phosphate substrate. Cryst. Growth Des., 18 (2018), pp. 2279 …

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Pure hydroxyapatite synthesis originating from amorphous …

Hydroxyapatite (HAp; Ca 10 (PO 4) 6 (OH) 2) is a form of calcium phosphate.It is the main inorganic mineral component of teeth and bones. HAp can be …

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Advancing phosphate ore minerals separation with …

Phosphate reverse flotation involves the employment of several apatite depressants, including phosphoric and sulfuric acids as well as their derivatives, which may be associated with a wide variety of environmental and health issues [9].Similarly, the flotation of other types of ores containing for instance sulfides requires the use of some …

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Perfecting the phosphorus process – MIT …

Phosphorus is mined from phosphate rock, also referred to as "mineral apatite," Cummins said. "Basically animal bones and teeth, it's sedimentary and can have varying degrees of purity and wide ranging …

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The 'Crago Process' and Its Applicability to a South African

The traditional approach for the beneficiation of South African siliceous sedimentary phosphate ores has been reverse cationic flotation. The robustness of this approach, however, has been a concern due to its sensitivity to parameters such as slimes content, headgrade (P 2 O 5 and SiO 2 content), reagent dosages and conditioning …

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Acid Alcohol Leaching of Apatite

The current practice for the production of wet-process phosphoric acid (H3PO4) involves leaching beneficiated phosphate rock in the presence of aqueous. ... This concentrate is ground to 90 pct minus 75 µm and leached to dissolve the phosphate. Apatite, Ca5(PO4)3(F, Cl, ½CO3, OH), is the primary phosphate mineral in the …

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Biologically Inspired Collagen/Apatite Composite …

In general, apatite ensures bone hardness, while the organic fraction forms the scaffold for the biomineral and regulates the biomineralization process . Bone apatite, i.e., biological apatite, is a mineral with a specific chemical composition that determines the biological, physicochemical and mechanical properties of the entire tissue.

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Enhancement of Apatite-Phosphorus-Rich Biochar …

This study presents a strategy to enhance the pyrolysis process of sewage sludge by incorporating calcium-based solid waste (carbide slag) to produce biochar enriched with bioavailable phosphorus. The results indicate that biochar produced solely from the pyrolysis of sewage sludge contains significant amounts of non-apatite …

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Review on Beneficiation Techniques and Reagents Used for Phosphate …

The flotation selectivity of apatite from a phosphate ore as a function of particle size has been investigated by Santana et al. . ... Mineral liberation is closely related to the particle size in the flotation process of actual phosphate ores. However, there is a certain conflict between liberation and particle size for the beneficiation of ...

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process of ore seperationprocess of phosphate apatite.md

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Insight into Biological Apatite: Physiochemical Properties and Preparation Approaches

The growth of apatite crystals from amorphous calcium phosphate is an area of intense study. Here, the authors report on the use of high resolution TEM imaging to provide evidence of nucleation ...

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Review of the Main Factors Affecting the Flotation of Phosphate …

The overall aim is to control the selectivity and recovery of the process. The following review is an attempt to add to previous works gathering phosphate froth flotation data. In that sense, the relevant parameters of phosphate ores flotation are discussed while focusing on apatite, calcite, dolomite, and quartz as main constituent minerals.

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The mechanism of biomineralization: Progress in …

1. Introduction. Biomineralization is a distinctive and vital characteristic of the vertebrate skeletal and dental systems, playing a pivotal role in biological growth, development, and evolution .It is a precisely regulated physiological process, in which stable calcium phosphate deposits within and outside the collagenous fibrous network, …

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Mechanochemical transformation of apatite to phosphoric …

This paper introduces a mechanochemical process for the clean production of phosphoric slow-release fertilizer and soluble phosphate powders directly from apatite (Ca 5 (PO 4) 3 (OH, F)) by just milling with sulfuric acid (H 2 SO 4, 98 wt%) and ammonium sulfate ((NH 4) 2 SO 4) at room temperature.It was found that, at certain molar ratios of …

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Leaching and recovery of phosphate and rare earth …

Apatite concentrate is an important source of phosphate and contains significant amounts of rare earth elements (REEs). In this study, the possibility of selective phosphoric acid leaching of phosphate and calcium from the Esfordi (Yazd province, Iran) apatite concentrate, containing 16.3% phosphorus, 37.1% calcium, 2.9% iron and 1.2% …

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Biological Properties and Medical Applications of Carbonate Apatite…

Carbonate apatite is a calcium phosphate ceramic that resembles bone tissue with respect to reactivity, especially in acidic environments. ... Takahashi R., Egashira Y., Zhang J.Q., Gu J.Y., Koyano K., Ayukawa Y. Replacement process of carbonate apatite by alveolar bone in a rat extraction socket. Materials. 2021; 14:4457. doi: …

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Effect of geological origin of apatite on reverse flotation separation

1. Introduction. Phosphate is an incredibly important mineral resource that cannot be recycled and renewed in agriculture and has received increasing attention owing to its extended land use for rising biodiesel and food production (Sis and Chander, 2003, Cao et al., 2015).Flotation is an effective approach that can be used to selectively …

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A new hydrometallurgical process for extracting rare …

1.. IntroductionApatite containing average 0.1–0.8% rare earth oxides is the main source of phosphate fertilizers and phosphoric acid. When apatite is leached with HNO 3, all the rare earths substituted in the apatite lattice for calcium ions are dissolved and a variety of processes are available for their recovery [1], [2], [3], [4].Tributyl …

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Insight into Biological Apatite: Physiochemical Properties …

1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of both bones and teeth, it is distributed in the organic constituents with certain sequence and direction [].By serving as the fillers in such biological tissues, biological apatite is critical …