Talk:Phosphogypsum

{{quote|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}}{{cite web|title=Calcium sulfide|url=https://en.wikipedia.org/w/index.php?title=Calcium_sulfide&oldid=693845315|accessdate=30 June 2016}}

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.

{{reflist-talk}}

This is neither phosphate mineral nor mineral at all. Eudialytos (talk) 12:29, 18 June 2017 (UTC)

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)