January 2024. It is time to start doing something. I don't need phosphogypsum to research – experiments can be done with usual gypsum. The goal is to dissolve and precipitate gypsum. At first I need to dissolve it. I put 0.1 gram of gypsum hemihydrate (plaster of Paris) into some 30 ml of liquid.
Water – doesn't dissolve.
Carbonated water – doesn't dissolve.
Vinegar 9% – doesn't dissolve.
NaCl solution – dissolve. They say NaCl increases solubility of gypsum.
(NH4)2SO4 – doesn't dissolve. But they say ammonium sulfate increase solubility of gypsum.
10% ammonia – doesn't dissolve. I expected it will form complex with Ca, but it seems it doesn't. I wanted to try ethylenediamine as well, it also creates complexes. But I am not sure about its safety, at least it is flammable. Not this time, maybe later.
Citric acid – dissolve (not so true). I was lazy to prepare a new sample, so I put citric acid into ammonia solution. Several months later I realized that it was ammonium citrate to dissolve gypsum. I put more gypsum into solution, it didn't dissolve. I was lazy and just put the bottle on a shelf in order to wash it later. I didn't want gypsum to go to the sewer, so it would not be just washing a bottle. A few weeks later I noticed that gypsum becomes more white and it didn't lie on a bottom but was floating in the solution. Some year later I made a conclusion that gypsum had been converted into calcium citrate.
Phenibut (possible hydrochloride) – dissolve.
Glycerol – doesn't dissolve.
DMSO – doesn't dissolve.
Acetone – doesn't dissolve.
Vodka (40% ethanol), glycine – I don't remember.
The conclusion:
The solubility of gypsum can be increased. This increase did not look very high for me. Maybe I need to search for another ways. I heard about converting gypsum into calcium carbonate. Let's try it.
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