Talk:Phosphogypsum

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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

^[1]

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.

References

^ "Calcium sulfide". Retrieved 30 June 2016.

Not a phosphate mineral or mineral

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

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

[CaS-1] "Calcium sulfide". Retrieved 30 June 2016.

[1]