The only source of phosphorus is the phosphate rock, and these rocks are formed over a time span of approximately 10 to 15 million years. Phosphate rocks are a non-renewable resource due to the ...

Phosphate Ion (PO43-) A phosphate ion is formed when three protons are removed from phosphoric acid ( H 3 P O 4). It is a polyatomic ion with the formula P O 4 3 −. It is also called a phosphate group. In this ion, the central phosphorous ion is surrounded by four oxygen atoms. Hence, it has a tetrahedral shape.

Phosphate rock was first mined in England in 1847 for use as a fertilizer. It was in 1881 that Captain J. Francis LeBaron, of the Army Corps of Engineers, discovered Florida's treasure in black phosphate pebbles in the Peace River. A "hard rock" phosphate reserve in …

The Florida Industrial and Phosphate Research Institute (FIPR Institute) is a legislatively created university research institute within Florida Polytechnic University. Since its inception (as the Florida Institute of Phosphate Research) in 1978, the FIPR Institute has grown and developed into a world-class research entity specializing in ...

fertilizer plants, where phosphate rocks are digested with an acid (e.g. sulf uric, nitric or hydrochloric acid). The tri-calcium pho sphate from the phosphate rock reacts with concentrated su lfuric acid to produce pho sphoric acid and calcium sulfate (an insoluble salt); and • The thermal process, where elemental phosphorous is

The term phosphate rock (or phosphorite) is used to denote any rock with high phosphorus content. The largest and least expensive source of phosphorus is obtained by mining and concentrating phosphate rock from the numerous phosphate deposits of the world. Some phosphate rock is used to make calcium phosphate nutritional supplements for animals.

Phosphate rock minerals are the only significant global resources of phosphorus. The United States is the world's leading producer and consumer of phosphate rock, which is used to manufacture phosphate fertilizers and industrial products. Subscribe to receive an email notification when a publication is added to this page. Monthly Publications

In organic chemistry, phosphate or orthophosphate is an organophosphate, an ester of orthophosphoric acid of the form PO 4 RR′R″ where one or more hydrogen atoms are replaced by organic groups. An example is trimethyl phosphate, (CH 3) 3 PO 4.The term also refers to the trivalent functional group OP(O-) 3 in such esters.. Orthophosphates are especially important among the various ...

Phosphate rock may be in the form of nodular, residual phosphatic limestone, vein phosphates, or consolidated and unconsolidated phosphatic sediments. Calcium and aluminium phosphates (wavellite and turquoise) have been found at several localities in Victoria, but the only known production (16,270 tonnes) was from Phosphate Hill, near Mansfield.

Phosphate rock comes from geologic deposits located around the world. Its main constituent is apatite, a calcium phosphate mineral primarily extracted from sedimentary marine deposits, with a small amount obtained from igneous sources. Most phosphate rock is recovered through surface mining, although some is extracted from underground mines.

It contains over 30 percent total phosphate (3-8 percent available) and 48 percent calcium (as CaO). Phosphate rock has approximately one fifth the neutralizing power of lime. Natural rock phosphates are from deposits of apatite rock formed eons ago by sea life that left behind fossils and shells composed primarily of calcium phosphates.

Phosphogypsum is a waste by-product formed with the "wet process" method of extraction of phosphoric acid out of phosphate rock, which uses sulfuric acid and water to break it: Returning the phosphoric acid and gypsum (calcium sulphate, or CaSO4). The problem here is that the uranium in the phosphate rock produces 226Ra (among other ...

Like limestone, phosphate rock is deposited in sedimentary basins where the influx of detrital material is relatively low. That allows the phosphate to accumulate with very little dilution from other materials. Where the dilution rate is high, phosphatic shales, mudstones, limestones, and sandstones will form instead of phosphate rock.

the phosphate rock could have formed by replacement of calcium carbonate with car bo nate-fluorapatite. Soils in the area differ according to the geologic age of the deposits on which they are formed. Those with red mottling and brown hardpan are developed

flawed assumption that the world reserve of phosphate rock is a static figure. Market dynamics could make it possible that phosphate reserves increase over time. Growing demand and limited supply caused phosphate rock prices to soar in 2008. After years of low and relatively stable prices, phosphate rock …

What is Rock Phosphate? Rock phosphate is a mined rock that contains limestone and clay as well as a high concentration of phosphorus (P). The actual composition varies depending on it's source but it usually contains 16 to 20% P.

Phosphate rock and phosphorite are names used for sedimentary rocks that contain at least 15% to 20% phosphate on the basis of weight. 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 rock was first mined in England in 1847 for use as a fertilizer. It was in 1881 that Captain J. Francis LeBaron, of the Army Corps of Engineers, discovered Florida's treasure in black phosphate pebbles in the Peace River. A "hard rock" phosphate reserve in …

As a mineral resource, phosphate rock can be defined as an unprocessed ore. The chemical form of Florida Phosphate rock is P 2 O 5. This implies that the relative atomic mass of Phosphorus is 62 and that of Oxygen is 80. The percentage abundance of Phosphorus is thus (62/142) * = 44%. The Origin of the Phosphate Rock

Phosphate rock (phosphorite) is a marine sedimentary rock which contains 18-40% P 2 O 5, as well as some uranium and all its decay products, often 70 to 200 ppmU, and sometimes up to 800 ppm. The main mineral in the phosphate rock is apatite, and most commonly, fluorapatite – Ca 5 (PO 4) 3 F or Ca 10 (PO 4) 6 (F,OH) 2.

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 …

Phosphorus is mined primarily as phosphate rock, a fairly common rock found worldwide. It takes about 1 ton of phosphate to produce 130 tons of grain, although this figure is highly variable depending on soil conditions, farm history, crop type, and fertilizing efficiency (Vaccari, 2009).

11.21 Phosphate Rock Processing 11.21.1 Process Description1-5 The separation of phosphate rock from impurities and nonphosphate materials for use in fertilizer manufacture consists of beneficiation, drying or calcining at some operations, and grinding. The Standard Industrial Classification (SIC) code for phosphate rock processing is 1475. The ...

Phosphate rock is formed in oceans in the form of calcium phosphate, called phosphorite. The phosphorus is an essential element for life and cannot be replaced. Phosphate rock is used for its phosphorus content, to produce fertilizer, feed, food and pharmaceutical product.

Phosphate fertilisers replenish soil phosphorus. Many farmers replenish phosphorus through the use of phosphate fertilisers. The phosphorus is obtained by mining deposits of rock phosphate. Locally produced sulfuric acid is used to convert the insoluble rock phosphate into a more soluble and usable form – a fertiliser product called ...

Rock phosphate is the raw material used to manufacture most commercial phosphate fertilizers on the market. In the past, ground rock phosphate itself has been used as a source of P for acid soils. However, very little rock phosphate is currently used in agriculture due to low availability of P in this native material, high transportation costs ...

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 (), which in turn is a critical and non-renewable element for fertilizer production, upon which global fertility depends.The startling limitation of phosphate rock reserves has led to a renewed intensity of research in ...

Phosphate Rock Characteristics, Mining and Beneficiation Geology and Mineralogy of Phosphate Rock "Phosphate rock" is an imprecise term that includes both unprocessed rocks and beneficiated concentrates. Nearly all phosphate fertilizer production is based on phosphate rock containing some form of the mineral apatite.

phosphorite, also called phosphate rock, rock with a high concentration of phosphates in nodular or compact masses. The phosphates may be derived from a variety of sources, including marine invertebrates that secrete shells of calcium phosphate, and the bones and excrement of vertebrates.. The thickest deposits of phosphorite form in areas characterized by carbonaceous shale and chert.

Phosphate | O4P-3 | CID 1061 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards ...

The phosphate rock was found to be formed by carbonate fluorapatite, calcite, dolomite, natural gypsum, quartz, calcite-Mg, apatite, pyrite, fluorite, and sphalerite-Cd and phosphogypsum by synthetic gypsum and sphalerite-Cd. The phosphate was found to be richer in organic compounds compared to phosphogypsum. Based on this work, the Tunisian ...

Phosphate is a sedimentary rock formed millions of years ago by the accumulation of organic matter on the ocean floor. Phosphate reserves are found in Africa, North America, Kazakhstan, the Middle East and Oceania but the world's largest deposits are located in Morocco, which is also one of the global leaders in phosphate extraction.

Phosphate rock often occurs with quartz and feldspars, with economically viable deposits consisting of at least 8-18% P 2 O 5 and the ability to beneficiate to a maximum of 42%P 2 O 5. Sedimentary deposits occur throughout the geologic timescale, exhibiting a wide variety of chemical compositions and textures.

and decreasing temperature. Apatite may survive rock weather­ ing for a time to form a phosphate-rich residuum, but it breaks down under prolonged exposure. Some of it may be redeposited locally. In high-calcium soils and rocks, apatite is again the min­ eral formed. Where the terrane consists of igneous rocks…

Phosphate rock was first mined in England in 1847 for use as a fertilizer. It was in 1881 that Captain J. Francis LeBaron, of the Army Corps of Engineers, discovered Florida's treasure in black phosphate pebbles in the Peace River. A "hard rock" phosphate reserve in …

In most ecological systems, the phosphate content is the limiting factor for growth. Nearly all igneous rocks contain some phosphate, even if it is only ~0.1% (0.2% P 2 O 5 on average in lithosphere), with nearly all of it in the form of apatite. Sedimentary rocks generally contain rather less (~0.1% P 2 O 5 on average).

Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding. Many of the picturesque views of the desert southwest show mesas and arches made of layered sedimentary rock.Common Sedimentary Rocks:

Phosphate rock is a finite, non-renewable resource • Maximum recovery, utilization and recycling of phosphate rock, fertilizers, byproducts and wastes should be emphasized Reserves and resources • Reserves are a dynamic quantity • Resources can become reserves • There is no evidence for a "peak phosphorus" event