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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 ...
Phosphate is a declining export to China. Previously, significant amounts of rock were shipped to China, where it was processed into phosphate fertilizer. The majority of phosphate mining in Florida is done in the Peace River watershed. Phosphate mining companies use draglines to remove surface soils up to 60 feet (18 m) deep over thousands of ...
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. In 2015, the US produced 12 percent of the world's phosphate rock.
Phosphate fertilizers are obtained by extraction from phosphate rock, which contains two principal phosphorus-containing minerals, fluorapatite Ca 5 (PO 4) 3 F (CFA) and hydroxyapatite Ca 5 (PO 4) 3 OH. Billions of kg of phosphate rock are mined annually, but the size and quality of the remaining ore is decreasing.
Volcanic rocks were thought to be a good source for rock powder but it was determined that it contains toxic elements as well. [3] Research has been done into phosphate rocks, but these too have the issue of containing heavy and radioactive elements. [1] The use of rock powder in remineralization has the potential to help mitigate global ...
Phosphorus refers here to salts of phosphates (PO 3− 4), monohydrogen phosphate (HPO 2− 4), and dihydrogen phosphate (H 2 PO − 4). These anions readily interconvert, and the predominant species is determined by the pH of the solution or soil. Phosphates are required for the biosynthesis of genetic material as well as ATP, essential for life.