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open access. Abstract. We model apatite-saturation in carbonatite melts based on a compilation of experimental data ranging from 650 to 1430 °C and 1 to 60 …
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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 …
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The first part describes techniques used for identification and investigation of properties of phosphate minerals, including X-ray diffraction analysis, powder neutron …
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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 ...
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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 …
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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.
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The phosphorus in the former type mainly exists in the form of apatite, ... However, China's high-phosphorous iron ore has a high grade of raw ore iron (the mass fraction is about 45%, far higher than the average iron grade of China's iron ore 32.6%, large reserves (accounting for 14.86% of the total reserves, about 7.45 billion therefore, …
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Apatite is a member of a group of structurally related minerals having compositions symbolized A 5 (BO 4) 3 X, in which A is a metal, commonly calcium or lead; B is …
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Phosphorus (P) is a limiting nutrient for primary productivity, and consequently it is thought to control the atmospheric oxygen level on geological time scales (Van Cappellen and Ingall 1994).Phosphorus-rich fertilizer is used in agriculture, and its use has serious implications for future food security (Cordell et al. 2011).Primary P has an …
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Based on the new evidence presented in this work, trace-element partitioning between apatite and carbonatitic magmas, phosphate solubility in these magmas, and …
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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 ...
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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 good agreement of both methods. The DTG curve shows that the process starts at the temperature of 565°C and wide of peak is of 135°C.
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Apatite can form through several different geological processes, including igneous, sedimentary, and metamorphic processes. Here are some of the ways in which apatite can form: 1. Igneous processes: Apatite can crystallize from magmas or melts that are rich in calcium and phosphorus. …
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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 …
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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 …
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Examples of primary phosphorus minerals include apatite, strengite, and variscite. The secondary phosphorus minerals include calcium (Ca), iron (Fe), and aluminum (Al) phosphates. The release of phosphorus from this pool is extremely slow and occurs when the mineral weathers and dissolves in soil water.
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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].
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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 …
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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 …
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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, …
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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 …
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India is deficient in Apatite & Rock Phosphate availability. In case of apatite, the country is fully dependent upon imports, while the Rock Phosphate production is only from two states namely, Rajasthan and Madhya Pradesh. RESERVES/RESOURCES Apatite The total Reserves/Resources of apatite as per NMI data, based on UNFC system as on 1.4.2015
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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 …
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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.
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Carbonatites are much more enriched in phosphorous and can contain up to 7.7 wt % P 2 O 5 (Hogarth et al., 1985; Bühn et al., 2001). ... Apatite S contents range from <0.07 to 0.49 wt %, with most concentrations …
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Semantic Scholar extracted view of "Phosphorous-solubility in carbonatite melts: apatite crystallization modeled via its solubility product" by G. Sartori et al.
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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
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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.
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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 ...
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Quantification of elemental calcium and phosphorous content in the materials was carried out by suspending 1 mg of product powder in 10 ml of 0.1 M HCl before injection to the plasma source.
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