Treating phosphate rock with sulfuric acid produces phosphoric acid, the water-soluble material from which most phosphate fertilizers are derived. Worldwide, more than 85 percent of the phosphate rock mined is used to manufacture phosphate fertilizers.
Phosphate rock grades are decreasing worldwide as the richer deposits are mined out. While there is plenty of low grade phosphate rock in the world which can be recovered it is becoming more expensive to produce good grade rock for easy processing into phosphoric acid and other fertilizer products.
techniques used to recover phosphate. 2. Identify the primary wastes created during the different stages of phosphate fertilizer production and use. 3. Discuss how waste products are managed. 4. Describe the phosphate cycle, and how the use of chemical phosphate fertilizer alters this cycle. 5.
PHOSPHATE ROCK (Data in thousand metric tons, unless noted) ... phosphate fertilizer materials, triple superphosphate fertilizer, and as merchant grade phosphoric acid. ... Hydrofluosilicic acid and oxides of uranium and vanadium were recovered as value added byproducts of phosphate manufacture.
The tremendous domestic reserves of phosphate rock together with the large annual production of normal superphosphate from phosphate rock have made the recovery of the small amounts of uranium (0.01 to 0.02 percent) in phosphate rock during the production of superphosphate an important problem.
A more cautious figure of up to 3700 t U/a for the theoretically possible uranium recovery from phosphates is presented in [IAEA 2001]. This total assumes annual production of phosphate rock of 142 million tonnes per year yielding 66 million tonnes of concentrate.
Hydrometallurgy of Phosphate Rock and the Recovery of Uranium 121 T REATMENT OF P HOSPHATE R OCK WITH S ULFURIC A CID . The phosphate fertilizer industry is at present based mainly on the use of sulfuric acid.
Integer has recently launched a new annual Phosphate Cost and Profit Margin Service. The first service to analyse the global phosphate cost curve, in combination with analysis of product prices and profit margins. Africa is target of large investment projects Africa is home to the largest producer of phosphate rock, taking advantage of competitive costs, Office
type problem is not unknown with other phosphate rocks and one solution to this problem that has been practiced in other parts of the world and has been investigated in this country is to grind the phosphate rock to minus 200 mesh to liberate the dolomite that is combined with the phosphate and use flotation to remove the dolomite from the mixture.
Claims. (Cl. 213-88) This invention relates to a process for the recovery of fluorine from phosphate rock in which the phosphate values are lirst recovered substantially free of iluorine, leaving a solids residue containing the major portion of the fluorine originally in the rock lfrom which the iluorine is extracted.
Oct 28, 2010· Phosphorus recovery from wastewater has become a necessity for sustainable development because phosphorus is a non-renewable essential resource, and its discharge into the environment causes serious negative impacts.
Sorption is an effective, reliable, and environmentally friendly treatment process for the removal of phosphorus from wastewater sources which otherwise can cause eutrophication of receiving waters. Phosphorus in wastewater, if economically recovered, can partly overcome the future scarcity of phosphorus resulting from exhaustion of natural phosphate rock reserves.
Depending on the source of rock phosphate, about 4.5–5 tons (dry basis) of PG is generated per ton of phosphoric acid (as P 2 O 5) recovered. The quality and quantum of PG generation depend on the quality of the phosphate rock and the process used to produce phosphoric acid: calcium sulfate generated either in dihydrate (CaSO 4 ·2H 2 O) or ...
How Phosphate is Recovered Phosphate rock is usually found 15-50 feet beneath the ground in a mixture of phosphate pebbles, sand and clay known as phosphate "matrix." The sandy layer above the matrix, called the overburden, is removed using electrically operated draglines.
Recently updated estimates report that the earth has at least 300 years of known phosphate rock reserves (recoverable with current technology) and 1400 years of phosphate rock resources (phosphate rock that may be recovered at some time in the future).
Phosphate recovery The sources are finite and mining and processing of the ore is an energy intensive and polluting process. Furthermore, sources of phosphate rock in the world are limited to a few countries and Europe is fully dependent on import of this critical resource for its food production.
Phosphate Rock. 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.
This invention relates to an improved process for recovering phosphate values. Phosphate rock, or calcium phosphate is produced in large quantities in the Florida phosphate fields. In this section, phosphate mineral is found in a stratum which may vary in thickness as from three to sixteen...
Phosphate Beneficiation. Market Specifications Bone phosphate of lime, 70 to 72 per cent, common. Bone phosphate of lime 72 to 77 per cent, premium. Production Problems. Phosphate rock being a low-priced material is produced as near the fertilizer market …
124 PHOSPHATE ROCK (Data in thousand metric tons unless otherwise noted) ... 95% of the U.S. phosphate rock ore mined was used to manufacture wet-process phosphoric acid and superphosphoric acid, which were used as intermediate feedstocks in the manufacture of granular and liquid ... but cannot be recovered economically with current technology.
Analysis of the concentrate produced from Abu Tartur phosphate rock was found to give 96% CaO, 2.8% Ln 2 O 3, 0.6% P and 0.009% Fe. This indicates that almost complete recovery of lanthanides content in the Abu Tartur phosphate rock sample has been obtained.
Mineral Resource of the Month: Phosphate Rock. Stephen M. Jasinski, mineral commodity specialist for the U.S. Geological Survey, ... Phosphorus was first discovered in 1669 by Hennig Brand in Germany, when he recovered it from urine. Phosphate rock production and consumption.
Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock which 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).
Hydrometallurgy of Phosphate Rock and the Recovery of Uranium 119 . Figure 2. Illustration of the isomorphous substitution of uranium with calcium in phosphate rock of different origin. Kola phosphates is of igneous origin. The presence of uranium in phosphates became important only during the …