@article{10272/23964,
year = {2024},
month = {5},
url = {https://hdl.handle.net/10272/23964},
abstract = {Phosphogypsum is an industrial waste considered as naturally occurring radioactive material.
Stack disposal and exposure to the environmental condition involve the production of acid
leachates with high potential pollutant loads as heavy metals and radionuclides. In this study, a
sequential neutralisation process was applied for cleaning the generated releases, and the two
obtained residues were characterised from the physical-chemical and radiological point of view
before their valorisation. The cleaning process was made up of two steps: the first one using
calcium carbonate until pH = 3.5, and the second one using calcium hydroxide until pH = 12. The
residue obtained in the first step was mostly calcium fluoride, while in the second step most
phosphates were precipitated, mainly as hydroxyapatite. The final liquid was treated to reduce
pH lower than 9, which is the limit included in the current directive for discharges of liquid effluents
into coastal waters. The main conclusion was that the solids from the first step could be
valorised as an additive in the manufacture of commercial Portland cements and ceramics, while
the solids from the second step could be used as raw material for the phosphoric acid
manufacture.},
organization = {This research was funded by the following projects: Operative FEDER Program-Andalucía 2014–2020 (UHU-1255876, UHU-202020); Grants PID2020-116461RB-C21 and 116461RA-C22) funded by MICIU/AEI/10.13039/501100011033; Research grant UCA/REC44VPCT/2021, by the University of C´adiz; Andalusian government (I + D + i-JAPAIDI-Retos project PY20_00096); Grant TED2021-130361B–I00 funded by MICIU/AEI/10.13039/501100011033 and, by “European Union NextGenerationEU/PRTR”, and Campus de Excelencia Internacional del Mar (CEIMAR) (research project CEIJ-C07.2). The authors thank Fertiberia S.A. for their support in obtaining the water samples used in this study.},
publisher = {Elsevier},
title = {Valorisation diagnosis of waste from the decontamination of phosphogypsum leachates through a combined calcium carbonate/hydroxide process},
doi = {10.1016/j.heliyon.2024.e30610},
author = {Soto Cruz, Francisco Javier and Pérez Moreno, Silvia María and Ceccotti Rodríguez, Estefanía Inés and Barba Lobo, Alejandro and Bolívar Raya, Juan Pedro and Casas Ruiz, Melquiades and Gázquez González, Manuel Jesús},
}