RE: Market news6 Jan 2024 16:31
>>What prevented the use of phosphogypsum in construction earlier, before the extraction of REE?
As its a waste product from acid production, it's extremely acidic, as I said it requires a large amount of lime to neutralise it.
Lime is alkaline, mixed acid gives a neutral result for the gypsum. Neutral is completely safe. You could put it in your mouth.
You can certainly build with it.
Acid: no build
Neutral: can build.