The recovery of phosphorus from incinerated sewage sludge ash (SSA) is assumed to be economical. Transformation from non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP), which has a higher bioavailability and more extensive industrial applications, was studied at 750-950°C by sewage sludge incineration and model compound incineration with a calcium oxide (CaO) additive.

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The role of intracellular calcium phosphate in osteoblast-mediated bone apatite formation Suwimon Boonrungsimana, Eileen Gentlemana,b,c, Raffaella Carzanigad, Nicholas D. Evansa,b,1, David W. McComba,e, Alexandra E. Portera,2, and Molly M. Stevensa,b,f,2 Departments of aMaterials and fBioengineering, bInstitute of Biomedical Engineering, and dElectron Microscopy Centre, Division of …

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Apr 01, 2011· The use of materials with low content of apatite mineral (40–50%) seems to be not economically relevant. apatite, horizontal flow constructed wetland, kinetics, phosphorus This content is only available as a PDF.

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Blue apatite is a prized mineral specimen by rock collectors for its vibrant royal blue color. Most of the apatite rock mined throughout the world is used to produce phosphate fertilizer. It is also used to produce animal feed supplements, phosphoric acid, elemental phosphorous, and phosphate compounds for the chemical industry.

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The concentration of phosphorus in glassy melt inclusions and rehomogenized nanogranitoids suggests a strong control of melt aluminosity on apatite solubility in peraluminous granites, which is consistent with existing experimental studies.

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Sep 08, 2018· Phosphorus (P) is an essential and limited nutrient element for all life. The recovery and reuse of P from municipal sewage sludge (MSS) incineration fly ash are considered to be practical and economical. Addition of biomass into MSS was proposed to enhance the P bioavailability during incineration. The speciation conversion of P during MSS incineration with different types of biomass …

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Apatite is ubiquitous in igneous, metamorphic, and sedimentary rocks, although usually in trace amounts. Apatite is the primary source of P and, due to its relatively rapid dissolution rate, can ...

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Apatite is a family of minerals centered around fluorapatite, or calcium phosphate with a bit of fluorine, with the formula Ca 5 (PO 4) 3 F. Other members of the apatite group have chlorine or hydroxyl that take the place of the fluorine; silicon, arsenic or vanadium replace the phosphorus (and carbonate replace the phosphate group); and strontium, lead, and other elements substitute for the ...

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Apatite: Its uses as a mineral and gemstone - Geology

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The phosphorous content in these rocks is mainly derived from the presence of apatite minerals Uses of Apatite as Phosphate Rock Most of the phosphate rock mined throughout the world is used to produce phosphate fertilizer.

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Apatite is the principal primary mineral, but a number of others are common in deposits formed during weathering of phosphate *In the trade the phosphate content of phosphate rock and fertilizer is commonly re­ ported as Ca3(PO4 >2, known as bone phosphate of lime (B.P.L.). To convert PjOs to

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THE DETERMINATION OF TOTAL PHOSPHORUS IN SOILS AND PARENT MATERIALS By J. K. SYERS,*t J. D. H. WILLIAMS,*t AND T. W. WALKER* (Received 6 lune 1968) ABSTRACT The amounts of total P extracted by Na2COa fusion and by HF and HCI04 digestion procedures from selected New Zealand soils and parent materials were compared.

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The P 2 O 5 saturation content of the Panzhihua magma is about 1.35wt% according to the MELTS calculation, which is consistent with the P 2 O 5 content (1.3 AE 0.3wt%) at apatite saturation in the ...

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Despite widespread debate in the literature, there is still considerable uncertainty concerning which nutrient ultimately controls marine net ecosystem production (NEP) over geologic time. Geochemical arguments suggest that phosphorus is the culprit. The weathering of apatite, the primary phosphorus sink in Earth's exosphere, controls long-term phosphorus availability.

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Apatite Grinding Flow alanglover.co.za. mill for grinding apatite . The Quartz Page: Quartz as a RockForming Mineral. Quartz is one of the most abundant minerals, and as a major constituent in many rocks it is an important rockforming is estimated that about 12% of …

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Calcite

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Apatite Crystallography: Axial Ratios: a:c = 1:0.73454 : Cell Dimensions: a = 9.38, c = 6.89, Z = 2; V = 525.00 Den(Calc)= 3.22 : Crystal System:

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P2O5 and uranium content of weathered and fresh Tennessee phosphates, Akin mine, Columbia, Tenn__ _____ 65 Uranium content of representative clastic apatite from the land-pebble phosphate field, Florida. ____ _____ 67 Iron and uranium content, in weight percent, of representative apatites from the Bone Valley formation, Florida. 69

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Dec 13, 2019· Nevertheless, the Element of the Month discussion of phosphorus focuses primarily upon the reactions of phosphoric acid and its salts. Occurrence in Nature Phosphorus is not found free in nature, but is found in phosphate containing minerals, principally apatite, which is a calcium phosphate mineral with the formula Ca 10 (PO 4 ) 6 (OH) 2 .

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The evolution of macroscopic animals in the latest Proterozoic Eon is associated with many changes in the geochemical environment, but the sequence of cause and effect remains a topic of intense research and debate. In this study, we use two apparently paradoxical observations—that massively phosphorus-rich rocks first appear at this time, and that the median P content of rocks does not ...

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Apatite inclusions have been identified in several primary minerals, and their abundance and morphology have been described. A comparison of several methods used for the determination of total P in soils showed that Na 2 CO 3 fusion is the most reliable method for samples which contain apatite inclusions and that the effectiveness of extraction was usually in the order: Na 2 CO 3 fusion > HF ...

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Our study aimed at testing a mix of slag, limestone and sedimentary apatite to remove phosphorus from wastewater. We hypothesized that adding sedimentary rocks rich in calcium and apatite to slag would preserve P-removal properties, while reducing the pH of the treated water and acting as a seed germ for P-crystallization at the same time.

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The Ca and P content of the Cargill apatite was in the same range as those tested by Molle et al. (2005) which containing 37.3% Ca and 16.8% P, and materials tested by Joko (1984) containing 37.6% Ca and 15.2% P.The Ca/P molar ratio of 2.78 of the Cargill apatite, compared to the ratio of 1.67 of pure hydroxyapatite, suggests that some P was substituted by CO 3 2− which is generally the case ...

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Hydroxyapatite, also called hydroxylapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4) 3 (OH), but it is usually written Ca 10 (PO 4) 6 (OH) 2 to denote that the crystal unit cell comprises two entities. Hydroxyapatite is the hydroxyl endmember of the complex apatite group.The OH − ion can be replaced by fluoride, chloride or carbonate ...

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Phosphorous availability influences the dissolution of apatite by . apatite dissolution studies exist using fungi as weathering agents, and regulation of fungal weathering activity in response to different levels of phosphorus availability is largely unknown. Fungi were isolated from a …

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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 in response to different levels of phosphorus availability ...

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Mar 01, 2011· 3.1. Apatite-group minerals. Information and spectra for apatite-group minerals are presented in Table 1 and Fig. 1, respectively.Apatite is a common phosphate-bearing mineral, found in igneous, sedimentary and metamorphic rocks (Deer et al., 1992 ; Chang et al., 1996 ).Precipitation of apatite is a significant removal mechanism for phosphorus in various natural and anthropogenic …

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From the above data, two means of phosphorus en- richment in peraluminous (sub- or metaluminous) granite rocks are evident: The "Hoyos-type", which approximately paral- lels Harrison and Watson's isothermal apatite satu- ration curves, but at a higher phosphorus content for any given SiO/value than what could be ex- pected for normal granite ...

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