Semantic Scholar extracted view of "Phosphorous-solubility in carbonatite melts: apatite crystallization modeled via its solubility product" by G. Sartori et al.

Apatite group: hexagonal and pseudo-hexagonal phosphates, arsenates and vanadates containing the same prevailing (species-defining) cations at both M (1) …

The reduction of phosphorus content at the concentrate of some iron ore mines in Mexico, Sweden and Iran, where the apatite is the main phosphorous mineral, can be easily reached through anionic flotation with fatty acids collectors to float the apatite when sodium silicate is used to depress the iron oxides (Subramanian et al., 2002, …

Apatite crystals are a favorite among collectors with their stubby, terminated, hexagonal prisms, glassy transparency, and soft, yellow-to-greenish-yellow or blue mineral colors.These beautiful crystals rank high on blue gems and minerals lists.Much is mined in Mexico.. However, most of the apatite in the Earth's crust occurs not as macrocrystals, …

the content of calcite in the investigated sample of fluorapatite is (100 × 0.26) / 43.97 = 0.59%. Although this value is lower than the content of calcite determined by Rietveld analysis, there is still …

High phosphate content significantly increases apatite . The influence of phosphate content on apatite formation was investigated by producing a low-phosphate (about 1 mol% P(2)O(5)) and a high-phosphate (about 6 mol%) series of . Charlar en Línea; Apatite: Its uses as a mineral and gemstone. Apatite is the name of a group of phosphate ...

They are an important constituent of phosphorite, a rock mined for its phosphorus content and used to make fertilizers, acids, and …

Apatite is the most common phosphate mineral, and is the main source of the phosphorus required by plants. The bones and teeth of most animals, including humans, are composed of calcium phosphate, which is the same material as Apatite. (These biological Apatites are almost exclusively the Hydroxylapatite type.) Chemical Formula.

Besides, there was a remarkable content of phosphorous in SS (averagely 2–4 wt%), ... By detecting the ash of SS, phosphorous-containing compounds were mainly non-apatite inorganic phosphorous after combustion in 400–600 °C, while most phosphorous was apatite after combustion in 600–800 °C [22].

Based on the new evidence presented in this work, trace-element partitioning between apatite and carbonatitic magmas, phosphate solubility in these magmas, and …

The influence of phosphate content on apatite formation was investigated by producing a low-phosphate (about 1 mol% P 2 O 5) and a high-phosphate (about 6 mol%) series of melt-derived bioactive glasses in the system SiO 2 P 2 O 5 CaO Na 2 O; increasing amounts of CaF 2 were added by keeping the ratio of all other components …

The intensity of the yellow color is proportional to phosphate concentration. Absorbance may be measured at 400, 420 or 470 nm depending on the sensitivity required, the absorbance at 400 nm being ten times that at 490 nm for a given P concentration. However, due to potential interference from ferric ions at low wavelengths, 470 nm is …

Apatite-group minerals, the dominant repository of phosphate within Earth's crust, are insoluble under most conditions 5, and the presence of Fe 2+, solubilised …

The higher selectivity between apatite and magnetite with an acceptable content of phosphorous in the magnetite concentrate is obtained at a moderate dosage of about 400 g/t sodium silicate. The optimum flotation conditions are: 50 g/t collector dosage, 350–400 g/t dispersant dosage, pH 8.5–9 and pulp temperature 25–30°C.

Bone apatite provides a slow and steady dissolution of phosphorus after soil application in comparison with rock mineral fertilizer ( Zwetsloot et al., 2016 ). Thus, bone apatite has been proposed as a sustainable fertilizer with long-term benefits, especially when integrated into waste management and recycling.

Phosphorous contents in biomass are variable (0.01–5.0%, mean 0.2%) and it occurs in fluid, organic and inorganic matter of biomass such as mineralised aqueous solution, various organic forms, and different Ca, K, Mg and Fe phosphates. ... It was found that the P species in different coals commonly include accessory contents of apatite …

Phosphorus retention by granulated apatite: assessing Previous studies have already demonstrated the validity of natural apatite as a specific filtering material for P retention (Molle et al 2005; Bellier et al 2006; Harouiya Of primary interest was the P2Os content of apatitesaturated melts, because phosphate is an essential structural constituent (ESC; …

Introduction. Apatite, Ca 5 (PO 4) 3 (F, Cl, OH), is a mineral that consists of calcium phosphate and varying amounts of fluoride, chloride, or hydroxide ions. The apatite obtained by LKAB is a fluorapatite that contains about 0.4 wt% of rare earth elements. The apatite can be processed by the nitrophosphate process to produce NPK fertilizer.

Besides, there was a remarkable content of phosphorous in SS (averagely 2–4 wt%), as phosphorous was typically involved in ATP and ADP to participate in energy transformation processes [19], [20], [21]. ... By detecting the ash of SS, phosphorous-containing compounds were mainly non-apatite inorganic phosphorous after …

Assuming that most of the phosphorus in the metasedimentary source is hosted in apatite (though see 4.1.1 for caveats), partial melts of metasedimentary rocks will be buffered at the P2O5 content of apatite saturation if the source retains apatite that is in continual communication with the melt (Harrison and Watson, 1984; Watson and …

Most biominerals are inorganic/organic composite materials. 1 This is also the case for the bones and teeth of all vertebrates, which are formed by the combination of an inorganic calcium phosphate phase and an organic matrix 2 ().The inorganic component is a nanocrystalline solid with apatite structure and the chemical composition of a …

As illustrated by the broad range of topics presented in this volume, the mineral apatite, Ca 5 (PO 4) 3 (F,OH,Cl), is of importance in a greater variety of fields than virtually any other mineral. It is of particular significance in Earth science, life science, and material science; the foundation of this significance is the apatite atomic arrangement.

It can be seen that phosphorus and calcium associated closely. Particles with high phosphorus content also contained high calcium (white square in Fig. 4), which had the structure of oolitic texture. Apatite and iron-bearing minerals in the raw ore had no significant change after reduction roasting with dephosphorization agent.

The percent content of phosphorus in dry mass of sludge differs from that in ash after combustion: dewatered sewage sludge contains about 2.6–3.4% of phosphorus 7,8, whereas the ash after ...

Apatite (Ca 10 (PO 4) 6 (OH,F,Cl) 2) is the primary inorganic source of phosphorus in the biosphere. Soil fungi are known to increase plant-available phosphorus by promoting dissolution of various phosphate minerals. Yet no apatite dissolution studies exist using fungi as weathering agents, and regulation of fungal weathering activity

The increase in the Sr content in apatite from Li-rich pegmatites and B-P±F-rich leucogranites could be related to problems in accommodating this element in the albite structure, favoring its incorporation into apatite. ... Phosphorous behavior in pegmatitic melts has been described as incompatible until the intermediate stages of pegmatitic ...

1. Introduction. Apatite is the most common non-carbonate phase in both intrusive and extrusive carbonatites (see Section 4), but its modal content varies greatly from trace levels to > 50% in cumulate rocks commonly also enriched in magnetite, ferromagnesian silicates, zircon and Nb oxides (e.g., Andersen, 1986, Chakhmouradian …

We studied clinopyroxene–apatite–K-feldspar–phlogopite xenoliths (CAKP), collected from the Late Cretaceous lamprophyre dikes of the Alcsútdoboz-2 (Ad-2) borehole, Transdanubian Central Range, Hungary. Apatite and K-feldspar contain a large number of primary, negative crystal shaped carbonatite melt inclusions. Chemically, the …

Bone is a natural composite material whose main components are mineral and organic matrices 1, 2. The mature mineral matrix is in the form of nanosized, elongated platelet-like carbonated calcium ...