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PhosphogypsumPhosphogypsum refers to the gypsum formed as a by-product of processing phosphate ore into fertilizer with sulfuric acid. Phosphogypsum is radioactive due to the presence of naturally-occurring uranium and radium in the phosphate ore. Additional recommended knowledgeMarine-deposited phosphate typically has a higher level of radioactivity than igneous phosphate deposits, because uranium is present in seawater.[1] In the United StatesThe United States Environmental Protection Agency has banned most applications of phosphogypsum with a radium-226 concentration of greater than 10 picocuries/gram (pCi/g). As a result, phosphogypsum which exceeds this limit is stored in large stacks. Florida has a large quantity of phosphate deposits, particularly in Bone Valley region. However, the marine-deposited phosphate ore from central Florida is highly radioactive, and as such, the phosphogypsum by-product is too radioactive to be used for most applications. As a result, there are about 1 billion tons of phosphogypsum stacked in 25 stacks in Florida (22 are in central Florida) and about 30 million new tons are generated each year.[2] Various applications have been proposed for using phosphogypsum, including using it as material for:[1]
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phosphogypsum". A list of authors is available in Wikipedia. |