Bugün öğrendim ki: Fosfojips, gübre üretiminin yaygın bir yan ürünüdür. Çok az pratik kullanımı vardır ve radyoaktiftir, uranyum, toryum, radyum, radon ve polonyum içerir. Bu nedenle Stacks'ta süresiz olarak saklanırlar. BİR ton fosforik asit, BEŞ ton fosfojips atığı üretir.

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**Phosphogypsum** is the [calcium sulfate](/wiki/Calcium_sulfate "Calcium sulfate") hydrate formed as a [by-product](/wiki/By-product "By-product") of the production of [fertilizer] (/wiki/Fertilizer "Fertilizer") from [phosphate rock](/wiki/Phosphate_rock "Phosphate rock"). It is mainly composed of [gypsum](/wiki/Gypsum "Gypsum") (CaSO4·2H2O). Although gypsum is a widely used material in the [construction industry](/wiki/Construction_industry "Construction industry"), phosphogypsum is usually not used, but is stored indefinitely because of its weak [radioactivity](/wiki/Radioactivity "Radioactivity") caused by the presence of naturally occurring [uranium](/wiki/Uranium "Uranium") and [thorium](/wiki/Thorium "Thorium"), and their daughter isotopes [radium](/wiki/Radium "Radium"), [radon](/wiki/Radon "Radon") and [polonium](/wiki/Polonium "Polonium"). The long-range storage of phosphogypsum is controversial.[1] About five tons of phosphogypsum are generated per ton of phosphoric acid production. Annually, the estimated generation of phosphogypsum worldwide is 100 to 280 Mt.[2] [](/wiki/File:Sfaz_ISS_satfoto_2015.jpg) A 2015 astronaut photo of the [Medina of Sfax](/wiki/Medina_of_Sfax "Medina of Sfax") with part of the port and the distinctive circular earth works of the 420 ha [Taparura](/wiki/Taparura "Taparura") redevelopment project of which 260 ha have been [reclaimed](/wiki/Reclaimed_land "Reclaimed land") from the sea by depositing phosphogypsum. [3]