Phosphate Ore

Phosphate Ore


a natural mineral formation that contains phosphorus and phosphorus compounds in such concentrations that make it technically and economically feasible to process the ore in order to obtain phosphorus-containing products, such as mineral fertilizers, phosphate mineral supplements, and phosphate salts, for various industries. The major useful component of phosphate ore is phosphorus in the form of the phosphoric anhydride P2O5. The P2O5 content in phosphate ores varies from 2–6 to 25–34 percent, depending on the processing behavior, mining and geological conditions, and other factors.

Phosphate ores are divided into two major groups of natural formations—phosphorites and apatites. Less often, aluminum phosphates, iron phosphates, and guano serve as phosphate ores. The major components of phosphate ores are the apatite phosphate minerals, the most common of which are fluorapatite (in endogenous apatite deposits) and carbonate apatite and its modifications, francolite and kurskite (in exogenous phosphorite deposits); hydroxylapatite sometimes occurs in significant amounts.

In addition to phosphate minerals, phosphate ores also contain other minerals, which sometimes prove to be valuable by-products, for example, nepheline, sphene, titanomagnetite, magnetite, aegirine, and, as isomorphic impurities, strontium and rare-earth and rare elements. Phosphate ores may also contain harmful impurities, such as dolomite, calcite, quartz, chalcedony, glauconite, clay minerals, pyrite, and iron hydroxides.

A distinction is made between endogenous and exogenous phosphate ores on the basis of origin. Endogenous deposits include (1) magmatic (late magmatic) deposits, which occur as sheet and lenticular deposits of complex apatite ores associated with nepheline syenites (for example, at the Khibiny deposits in the USSR), and (2) carbonatite (magmatic and metasomatic) deposits related to ultrabasic alkaline masses (for example, the Kovdor and Vostochnyi Saian deposits in the USSR of complex apatite ores in the form of stocks and stockworks). Exogenous deposits include (1) chemical and biochemical sediments of ancient shelves in the form of phosphorites interbedded with carbonate-siliceous, terrigenous glauconite, and other sedimentary complexes (the Karatau, Egor’evsk, and Chilisai deposits in the USSR) and (2) residual and infiltration deposits formed as a result of the erosion of apatite- and phosphorite-bearing rocks, usually of carbonate composition, and which are regolithic (the Kovdor, Vostochnyi Saian, Belkino, and Telek deposits in the USSR).

Phosphate ores are worked by open-pit and underground-mining methods: friable phosphorites, such as those in the Baltic republics, are worked by geotechnological methods.

Various methods for concentrating phosphate ores exist, and the selection of a particular method depends on the mineral composition and the structure and texture of the ore. Apatite ores (for example, the ores of the Khibiny deposit) are concentrated by flotation, which yields a high quantity of a rich apatite concentrate (39.4 percent P2O5). Phosphorites (for example, the Egor’-evsk, Chilisai, and Viatka-Kama deposits in the USSR and deposits in Florida and North Carolina in the USA) are concentrated by sieving; the primary concentrate obtained is subjected to further concentration by flotation, magnetic separation, or calcination; the last method is finding increasing use. Some phosphate ores are not subjected to concentration before use, for example, those used in the electrothermal production of yellow phosphorus and thermal phosphoric acid.

The total world reserves of phosphate ores, excluding the socialist countries, are estimated (1974) at 81 billion tons (or about 18–19 billion tons of P2O5). Most of the reserves are located in Morocco (40 billion tons) and the United States (14.75 billion tons). Considerable reserves are found in Australia (2.5 billion tons), Tunisia (1.2 billion tons), the Western Sahara (3.0 billion tons), Peru (1.5 billion tons), and Algeria (1.0 billion tons).

The estimated reserves of phosphate ores in the USSR total (1976) 10.3 billion tons (or 1.3 billion tons of P2O5), including 5.4 billion tons of apatite (0.6 billion tons of P2O5) and 4.9 billion tons of phosphorite (0.7 billion tons of P2O5). Large deposits of phosphate ores have been found in the Mongolian People’s Republic (Khubsugul deposit), in Vietnam (Lao Cai deposit), and in China.

The annual world production of phosphate ores in 1974 was 110.8 million tons, of which 41.5 million tons was produced in the USA, 19.7 million tons in Morocco, 3.9 million tons in Tunisia, 2.6 million tons in Togo, 1.9 million tons in Senegal, 1.6 million tons in Jordan, and 1.5 million tons in the Republic of South Africa.


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References in periodicals archive ?
The JPMC exports about 60 percent of its production to the Indian market deemed a major market for phosphate ore and fertilizers.
Jeday points out that "60% of the phosphate ore is processed in Gabes into phosphoric acid and chemical fertilizer in more than 25% of the national electricity production".
This further court delay required Mosaic to purchase the necessary phosphate ore from competing non-U.
The proposed projects for the Golden Triangle Development Project include mining projects, such as using phosphate ore and constructing fertiliser factories and other projects to utilise raw materials to manufacture cement.
The plant and all structures were removed within two years of closure, but soil at the site and massive piles of radioactive slag-a byproduct of phosphate ore processing-remain.
With the depletion of phosphates and a shortage of mineral processing engineers, along with the need for new extraction and refining methods, Kawatra and Carlson present Beneficiation of Phosphate Ore, and intend that it serve students, engineers, and other professional who may have little or minimal knowledge of mineral processing.
The railroad trestle at Placida was built over 100 years ago to carry railcars laden with phosphate ore to the loading dock at Port Boca Grande.
The recent launch of Acron's own phosphate ore production, the cancelation of 15% of its treasury shares and the successful funding of its potash project are strong positives for the company.
However, the phosphate ore is located near a gas field in Jalamid where extensive exploration is taking place.
According to Goldstein (2000) the bioprocess of rock phosphate ore involves much more processes the simple acid dissolution.
Khalid al-Mudaifer said the 21 billion riyals will cover the cost of extracting and treating the phosphate ore.
The contract area is estimated to contain 800 Mt of phosphate ore.