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For each ton of phosphoric acid produced by the processing of phosphate rock, five tons of waste are generated. This waste takes the form of impure, useless, radioactive solid called phosphogypsum . Somewhere between 100,000,000 and 280,000,000 tons of phosphogypsum waste is estimated to be produced annually worldwide.
Ra, this limit is equivalent to 0.01 milligrams (0.00015 gr) of radium per metric ton or a concentration of 10 parts per trillion. (See § Gyp stacks below.) EPA approved the use of phosphogypsum for road construction during the Trump Administration in 2020, saying that the approval came at the request of The Fertilizer Institute, which ...
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 ...
Uranium occurs at concentrations of 50 to 200 parts per million (ppm) in phosphate-laden earth or phosphate rock. As uranium prices increase, there has been interest in extraction of uranium from phosphate rock, which is normally used as the basis of phosphate fertilizers. [86] There are 22 million tons of uranium in phosphate deposits.
Rock phosphate can also be ... and consequently there are quadrillions of tons of phosphorus in Earth's 3×10 19-ton ... exports and price for phosphate and 86 ...
The predominant source of phosphorus in modern times is phosphate rock (as opposed to the guano that preceded it). US production of phosphate rock peaked in 1980 at 54.4 million metric tons. The United States was the world's largest producer of phosphate rock from at least 1900, up until 2006, when US production was exceeded by that of China ...
As of 2005 the Aurora mine had estimated proven and probable reserves of approximately 356 million tonnes of phosphate rock at an average grade of 30.7% P 2 O 5. PotashCorp has rights to exploit an area of 8,900 hectares (22,000 acres) of phosphate-bearing reserves, sufficient to support the mine's operations for around 75 years. [1]
Ellis noticed the rock and suspected it to be phosphate (similar in appearance to the phosphate coming from Baker Island), but was rebuffed by Denson and told that it was only wood. Three months later, Ellis decided to test his hunch and tested the rock for phosphate. It turned out to be phosphate ore of the richest quality. [1] [2]