Sulfate Removal - Puzzling Gypsum Addition
Sulfate Removal - Puzzling Gypsum Addition
(OP)
A plant is considering adding lime, sodium aluminate, and gypsum to precipitate sulfate (CaSO4 - Gypsum!!!). They call the gypsum a seed source or precipitation enhancement agent, and seem to have pilot tests to show it works. I have no idea how adding the product that precipitates can aide in its formation... anyone ever heard of doing this?





RE: Sulfate Removal - Puzzling Gypsum Addition
Best regards
Morten
RE: Sulfate Removal - Puzzling Gypsum Addition
RE: Sulfate Removal - Puzzling Gypsum Addition
RE: Sulfate Removal - Puzzling Gypsum Addition
Na2CO3 + CaSO4 = CaCO3 ¯ + Na2SO4
sodium carbonate + calcium sulfate
= calcium carbonate + sodiumsulfate
Calcium sulfate is being added to precipitate the carbonate, nothing more. This is the same reaction that is involved in the reduction of noncarbonate calcium hardness.