Phosphorite - Wikipedia
Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% [1] to 20% phosphorus pentoxide (P 2 O 5). Marketed phosphate rock is enriched ("beneficiated") to at least 28%, often more ...
Phosphate rock formation and marine phosphorus …
2011年8月1日 · Phosphate rocks, also referred to as phosphorites, are sedimentary deposits with high phosphorus (P) concentrations. These rocks are one of the primary ore sources for P (Fig. 1), which in turn is a critical and non-renewable element for fertilizer production, upon which global fertility depends.
The phosphorus cycle, phosphogenesis and marine phosphate-rich …
1996年4月1日 · Sources of sedimentary phosphate are microbial breakdown of buried organic matter and redox-driven phosphate desorption from iron and manganese oxyhydroxides. Dissolved sea-water phosphate represents an additional source which may become important in the formation of phosphatic hardgrounds.
Total phosphorus and phosphorus forms change in sediments …
2023年3月27日 · Phosphorus speciation in sediment provides useful information on the reactivity and potential bioavailability of P in the aquatic ecosystem. However, most experimental studies on phosphate release from sediments have focused on static release in lakes or estuaries, but there are not many studies about P in river sediments.
Variations of phosphorus in sediments and suspended ... - Nature
2024年11月4日 · We investigated the composition, distribution of P fractions in sediments and suspended particulate matter (SPM) of Erhai Lake, southwest China, and explored the relationships between...
Response mechanism of sediment endogenous phosphorus …
2024年1月1日 · Endogenous phosphorus (P) release from lake sediments is an important factor in the eutrophication of overlying waters, as P is the limiting nutrient salt affecting cyanobacterial growth. Microorganisms are also key to the evolution of cyanobacterial growth and disappearance, as they can influence the release of endogenous P.
Phosphate Rocks - IntechOpen
2016年4月13日 · Sedimentary phosphate rocks: marine phosphate deposit, metamorphic deposit, biogenic deposit (bird and bat guano accumulation) and phosphate deposit as the result of weathering. The sedimentary deposits contain the varieties of carbonate-fluorapatite that are collectively called as francolite (Section 2.6).
(PDF) Phosphorus and Phosphorites: Sedimentology and Environments of ...
1994年1月1日 · We evaluate the formation of phosphorites and the sources of phosphorus in each of these settings. We define primary phosphogenesis, which produces primary phosphorite, as the process of...
Sedimentary and Igneous Phosphate Deposits: Formation and Exploration ...
2017年5月1日 · Sedimentary phosphorite is a marine bioelemental sedimentary rock that contains >18 wt % P 2 O 5. While small peritidal phosphorites formed in Precambrian coastal environments, economically significant upwelling-related phosphorite did not accumulate until the late Neoproterozoic and continued through the Phanerozoic.
The Forms of Phosphorus in Sediments of Large Lakes (Poyang …
2024年6月25日 · The release and retention of phosphorus (P) in sediments play a crucial role in determining whole-system P dynamics and balance in eutrophic lakes. Using Poyang Lake (China’s largest freshwater lake) as a subject for a case study, we performed field investigations and collected data on specific P forms in the overlying water, interstitial ...