Talk:Phosphogypsum

Gypsum recycling in sulfuric acid factory or plant
"CaS is produced by "carbothermic reduction" of calcium sulfate, which entails the conversion of carbon, usually as charcoal, to carbon dioxide:
 * CaSO4 + 2 C  →  CaS  +  2 CO2

and can react further:
 * 3 CaSO4 +  CaS  →  4 CaO  +  4 SO2"

Instead of carbon or coal, could waste gypsum be sent to sulfuric acid plant where the gypsum is burnt with sulfur:
 * CaSO4 +  3 S  →  CaS  +  2 SO2

and reacted further:
 * 3 CaSO4 +  CaS  →  4 CaO  +  4 SO2

Overall,
 * 4 CaSO4 +  3 S  →  4 CaO  +  7 SO2

Calcium oxide has wide spread used. In addition, could hydrogen sulfide be used also ? Recycling gypsum with sulfur and/or hydrogen sulfide could add another aspect to wet sulfuric acid process.

Not a phosphate mineral or mineral
This is neither phosphate mineral nor mineral at all. Eudialytos (talk) 12:29, 18 June 2017 (UTC)

A news article about phosphogypsum in Convent, LA
Interesting enough. It has a photograph of a big pile of phosphogypsum.

https://www.theguardian.com/us-news/2019/nov/06/louisiana-st-james-parish-lake-radioactive-industrial-waste-cancer-town-pollution-mosaic — Preceding unsigned comment added by 84.226.214.17 (talk) 10:26, 6 November 2019 (UTC)