Chapter 4. Evaluation of phosphate rocks for direct application. Chapter 3 described the characterization of phosphate rock (PR) materials for direct application. Depending on their origin and geological history, PRs show great variability in their inherent properties, especially in their grade, beneficiation requirements and apatite reactivity.Free Consultation
Apatitic rock phosphates (RP) are commonly calcined to remove impurities and to increase phosphorus (P) concentration but calcination decreases the agronomic effectiveness of RPs used for direct application to soils.Phosphorite, phosphate rock or rock phosphate is a nondetrital sedimentary rock that contains high amounts of phosphate minerals.The phosphate content of phosphorite or grade of phosphate rock varies greatly, from 4 to 20 phosphorus pentoxide P 2 O 5.Marketed phosphate rock is enriched beneficiated to at least 28 , often than 30 P 2 O.Processed into an estimated 23 million tons of marketable product, valued at $1.6 billion, free on board (f.o.b.) mine. Florida and North Carolina accounted for than 75 of total domestic output the remainder was produced in Idaho and Utah. Marketable product refers to beneficiated phosphate rock with phosphorus pentoxide (P2O5) content.Was possible to upgrade the rock from 25.6 to 28.6 P. 2. O. 5. with a recovery of 97.2 . Other methods reported in the literature for upgrading the phosphate rock included calcination which is based on the carbonate dissolution after their decomposition a matter which requires high energy and high cost . Alternatively, some [30, 31].
Phosphate Beneficiation. Background. Definition of Beneficiation This is the second step in the mining process, after removal of the ore from the ground. Contact US. Beneficiation of Low Grade Phosphate Deposits . Semantic Scholar. Jun 25, 2015 . demand on phosphate rock for fertilizer production and its .Nov 01, 2011 Separation of refractory rock phosphate (P 2 O 5 = 11.5 ) from the Dalir area, Iran, containing quartz, calcite and other impurities, by calcination and flotation processes has been successfully used to upgrade the phosphate values. Petrographic studies of this ore showed that collophanite was the major phosphate mineral and the main gangue minerals were calcite, dolomite.Dec 02, 2014 Patrick Zhang, Research Director Beneficiation Mining In the case of phosphate production from Florida, the phosphate rock, after mining and transport, is pulped to a washer in the plant. One of the washer products ( 1 mm +150 mesh material) is processed by flotation. This stream is further classified for.Beneficiation options (Cont.) Flowsheets Unconventional minimal upgrade P 2 O 5 product feeding Improved Hard Process Production of Super Phosphoric Acid (70 P 2 O 5) O F U F O F O F ROM To Tailings Storage Facility Water to Users Return Water Raw Water Primary Secondary Crushing Scrubbing Desliming Product Thickener Filtration Fines.
On the Phosphate Rock Beneficiation for the Production of In the beneficiation of Florida phosphate rock, flotation plays a predominant role because it is the most economical way to separate the phosphate values from the sand and other impurities contained in the matrix Typically, the matrix is washed and deslimed at 150 mesh The material finer than 150 mesh is pumped to clay settling ponds.Phosphate rock from the mines is first sent to beneficiation units to separate sand and clay and to remove impurities. Steps used in beneficiation depend on the type of rock. A typical beneficiation unit for separating phosphate rock mined in Florida begins with wet screening to separate pebble rock that is larger than 1.43 millimeters (mm) (0.In some low grade commercial deposits, this may be as low as 4 percent. In the phosphate industry, the phosphate content of the rock is usually expressed as tricalcium phosphate and traditionally referred to as bone phosphate of lime (P 2 O 5 2.1853 = BPL). The latter term is reminiscent of the time when bones were the principal source of.High grade rock phosphate with 25 30 P 2 O 5 is sold directly after crushing to fertilizer companies as chips. Annually nearly 900,000 t of LGO is subjected to double stage, bulk and reverse flotation 5 , and the concentrate is sold as beneficiated rock phosphate (BRP) having 32 34 P 2 O 5 , to the fertilizer plants engaged in the production.
The “grade” referred to above was the percent P 2 O 5 in the phosphate plus silica rock. Beneficiation of raw phosphate ore by washing did not separate silica and the nodulized material contained 24.1 percent SiO 2, as shown in Table 1.Obtained from a feed sample containing about 21.13 P 2 O 5 and 19 A.I. Key Words Flotation, Phosphate ore, Francolite, Sodium carbonate, Oleic acid. 1. Introduction Phosphate ores are in high demand all over the world because they are the raw materials for the production of phosphate fertilizers and other chemicals (Fang and Jun, 2011).REFERENCES Shirqi I. S., Tawfiq O. A., “Akashat Phosphate Mine”, Report of the Ministry of Industry and Minerals, Iraqi State Company for Phosphate, Feb. 2010. Good, P. C., “Beneficiation of un weathered Indian calcareous phosphate rock by calcination and hydration”.Phosphate concentration that is needed in wet process should contain than 30 P 2 O 5, less than 1 MgO, and 1.6 CaO P 2 O 5 ratio and between 2 3 of Al 2 O 3 and Fe 2 O 3 . To upgrade the phosphate grade different beneficiation methods are applied currently, with the froth flotation being the most efficient and industrially used .
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