Comparative study of fresh phosphogypsum treatment by sulfuric acid and neutralization with NaOH and CO2

The acid-treated PG was neutralized by NaOH and CO2 aeration, creating CaCO3 in situ nano-microparticles identified by scanning electron microscopy (SEM) images and CaCO3 intensity by X-ray diffraction (XRD). In this study, the cement mortar test, which used treated PG from both sulfuric treatment and NaOH neutralization within CO2 aeration, has better compressive strength properties and hydration supported by SEM images, XRD results, and thermogravimetric analysis.