Phosphate Rocks | IntechOpen
Apatite is the most abundant phosphate mineral which include more than 95% of al phosphorus in the Earth´s crust. The seventh chapter of this book provides brief description of sedimentary and igneous phosphate rocks and introduces basic ideas for characterization and classification of phosphate rocks. The chapter continues with …
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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 …
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Mineralogical and Technological Aspects of Phosphate Ore …
Apatite is the main mineral concentrator of phosphorus in the ore; it forms disseminated prismatic crystals, vein clusters of crystals, less often massive clusters of fractured xenomorphic grains, often included in the grains of other minerals - pyroxenes, mica, sphene, nepheline (Fig. 1).
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Biogenic apatite in carbonate concretions with and without …
Phosphorus (apatite), which was the focus of this study, is high in the center of the concretion and decreases toward the outside (Fig. 3).
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(PDF) Phosphorus removal by apatite in horizontal flow …
The maximum phosphorus retention capacity was found to be approximately 7.4 g PO4-P/kg of granulated apatite. The study revealed low kinetic removal rate coefficients.
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Phosphate Minerals | SpringerLink
Abstract. Phosphate minerals are utilized in various fields. The apatite group is well known among the phosphate minerals. Our bones and teeth are also composed of apatites. Moreover, some naturally occurring phosphate minerals include radioactive elements. The crystal structures of phosphate minerals can accept metal cations of …
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Apatite: The mineral apatite information and pictures
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 …
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Phosphorus Forms Present in the Soil
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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Apatite: Its uses as a mineral and gemstone
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Apatite Meaning and Properties | Beadagebeadage اقرأ أكثر
Effects of phosphorus on partial melting of the Martian …
An apatite solubility model based on martian compositions will be needed to further explore this. This is reasonable as apatite has been observed to exist in the terrestrial upper-mantle as well that is locally enriched in phosphorus (e.g., apatite-bearing spinel-peridotite xenoliths within Victorian basanites; Frey and Green, 1974). 4.4.
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CALCIUM PHOSPHATE STONES: Causes and Prevention
Stone make up for my right kidney was 70% calcium phosphate (apatite) 20% struvite and 10% calcium carbonate. I had two 24 urine tests, Dr said they were pretty good. One day citrate was borderline low and one day sodium was a little high. PH was nearly 7 on both days. Dr Suggested trying to increase citrate and reduce sodium, which …
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EVIDENCE OF PHOSPORUS CYCLING IN THE SLAB-MANTLE INTERFACE FROM APATITE
Phosphorus is a biocritical element that cycles almost exclusively through solid and liquid phases at the Earth's surface. However, its cycling in subduction zones is not fully understood. Apatite is the primary phosphate mineral in basaltic rocks and is common in subduction-related exhumed metamorphic rocks.
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Apatite weathering and the Phanerozoic phosphorus cycle
The weathering of apatite, the primary phosphorus sink in Earth's exosphere, controls long-term phosphorus availability. If phosphorus is the ultimate controlling nutrient over geologic time scales, then long-term marine NEP is coupled to the release of phosphorus from apatite weathering. The most abundant apatite compositions found in …
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(Ca-Y)-phosphate inclusions in apatite crystals from …
Here, we report the first occurrence of two (Ca-Y)-phosphate phases in apatite crystals from ancient rocks from both the Barberton greenstone belt and the Pilbara Craton. First, a cubic Ca 3 Y(PO 4 ) 3 phase was observed in a sample of silicified tuff from the Mendon Formation from the Barberton greenstone belt.
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Microbial sequestration of phosphorus in anoxic …
Phosphorus is removed from the ocean by sedimentation of organic matter, and the subsequent conversion of organic phosphorus to phosphate minerals such as apatite, and ultimately phosphorite ...
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(PDF) A key role for iron-bound phosphorus in authigenic apatite …
The dominant sedimentary phosphorus forms were detrital apatite P and Al-bound p, whereas the amount of Fe-bound P was low because of anoxic condition. Based on the correlation between TP ...
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Synthetic apatite nanoparticles as a phosphorus fertilizer …
Agriculture is the major user of mined phosphorus (P), accounting for 80–90% of the world demand for P 1.Increasing population, growing preferences towards meat-based diets and rising demands ...
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Solubilization of Phosphorus from Apatite by Sulfuric Acid …
The phosphorus (P) present in apatitic materials is largely in forms that are not readily available for most arable crops. Many attempts have been made to increase the dissolution of phosphate rock. Hence, soluble P or superphosphate used as fertilizer has been produced by the industrial acidification of apatite (Becker, 1980).
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Trace Element Content and Partition in Apatite …
Phosphorus is obtained from the mining of phosphate rocks, mainly the mining of minerals belonging to the apatite group; these ores represent a limited and …
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Sustainable phosphorus management in soil using bone apatite
Soil fertility and phosphorus management by bone apatite amendment are receiving increasing attention, yet further research is needed to integrate the physicochemical and mineralogical transformation of bone apatite and their impact on the supply and storage of phosphorus in soil. This study has examined bone transformation …
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Apatite, phosphorus and titanium in eclogitic garnet from …
The existence of apatite exsolution lamellae in garnet supports earlier suggestions that garnet is a major repository for P in the mantle, and that P is strongly coupled to Na+Ti. The bulk P content (∼250 ppm) of mantle eclogites is unexpectedly similar to estimates for the P content (130–220 ppm) of the upper mantle; both rocks are ...
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Transformation of amorphous calcium phosphate …
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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Struvite and Triple Phosphate Renal Calculi
The relationship between infections and renal calculi has been known since the time of Hippocrates, but it was not until 1817 that Marcet identified the connection between urinary alkalinity, infection, phosphate calculi, and increased urinary ammonia. In 1901, Brown first suggested that urea splitting bacteria activity increased urinary …
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Apatite
As stated, apatite formed by the hardening reaction of calcium phosphate is low-crystalline apatite, compared with the sintered apatite which shows high crystallinity. However, the effect of crystalliity on the solubility is limited when compared with the effect of composition. In fact many elements are known to affect the solubility of apatite.
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A key role for iron-bound phosphorus in authigenic apatite …
A combination of pore water and solid phase analysis was used to determine whether authigenic carbonate fluorapatite (CFA) is currently forming in the sediment at two locations (OMEX I and II) on the North Atlantic continental platform Goban Spur (southwest of Ireland). Results of selective P extractions suggest that an early diagenetic …
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The role of intracellular calcium phosphate in osteoblast
However, despite their requisite function in building bone and decades of observations describing intracellular calcium phosphate, the precise role osteoblasts play in mediating bone apatite formation remains largely unknown. To better understand the relationship between intracellular and extracellular mineralization, we combined a sample ...
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A phosphate-rich marine reservoir in the redox stratified …
Phosphorus (P) is the key nutrient thought to limit primary productivity on geological timescales, and hence P bioavailability exerted a major influence on Earth's surface oxygenation dynamics ...
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Utilization of Apatite Ores | IntechOpen
Phosphate rock is an important mineral commodity used in the chemical industry and production of food. The first section of ninth chapter of this book introduces utilization of apatite ores for manufacturing of phosphorus. The second part deals with production of phosphoric acid via wet and thermal process and utilization of byproducts …
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Apatite
Apatite is the name given to a group of phosphate minerals, usually referring to hydroxylapatite (or hydroxyapatite), fluoroapatite (or fluorapatite), and chloroapatite (or chlorapatite).They are named for the presence of hydroxide (OH-), fluoride (F-), and chloride (Cl-) ions, respectively, in the crystal lattice. These three forms of apatite are not readily …
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Introduction to Apatites | IntechOpen
Since, apatite (fluorapatite) is the most abundant phosphate mineral, apatite bearing phosphate rocks represents an important source of inorganic phosphorus. First chapter of this book introduces the basic …
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