TY  - JOUR
AU  - Isek, Josip
AU  - Kaludjerović, Lazar
AU  - Vuković, Nikola S.
AU  - Milošević, Maja
AU  - Vukašinović, Ivana
AU  - Tomić, Zorica
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5273
AB  - Two samples collected from the phosphogypsum deposits of the chemical products industry Elixir Prahovo (Serbia) were subjected to a recrystallization experiment performed over several repeated cycles. In these tests, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant. Both raw phosphogypsum and recrystallized gypsum were examined using inductively coupled plasma optical emission spectrometry, X-ray diffraction and scanning electron microscopy with energy-dispersive spectrometry. The activity concentrations of (238)u, (235)u, Ra-226, Pb-210,Th- 232 and 40 K were investigated using gamma-ray spectrometry. Based on the activity concentration results, a number of radiometric parameters were calculated for the original and recrystallized phosphogypsum (i.e. radium equivalent activity, y indices for construction materials, a index and external and internal hazard indices). Raw phosphogypsum samples showed greater mean activity concentration levels of U-238 and Ra-226 than the international recommended limits, while the recrystallized gypsum demonstrated notably lower activity concentrations for these two isotopes. The activity concentration of Ra-226 in recrystallized gypsum is similar to 6 times lower than in raw phosphogypsum. Therefore, recrystallized gypsum does not present a radiation hazard when used as a building material, while raw phosphogypsum meets the requirements only for road construction materials.
PB  - Mineralogical Soc, Twickenham
T2  - Clay Minerals
T1  - Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering
EP  - 70
IS  - 1
SP  - 63
VL  - 55
DO  - 10.1180/clm.2020.11
ER  - 

@article{
author = "Isek, Josip and Kaludjerović, Lazar and Vuković, Nikola S. and Milošević, Maja and Vukašinović, Ivana and Tomić, Zorica",
year = "2020",
abstract = "Two samples collected from the phosphogypsum deposits of the chemical products industry Elixir Prahovo (Serbia) were subjected to a recrystallization experiment performed over several repeated cycles. In these tests, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant. Both raw phosphogypsum and recrystallized gypsum were examined using inductively coupled plasma optical emission spectrometry, X-ray diffraction and scanning electron microscopy with energy-dispersive spectrometry. The activity concentrations of (238)u, (235)u, Ra-226, Pb-210,Th- 232 and 40 K were investigated using gamma-ray spectrometry. Based on the activity concentration results, a number of radiometric parameters were calculated for the original and recrystallized phosphogypsum (i.e. radium equivalent activity, y indices for construction materials, a index and external and internal hazard indices). Raw phosphogypsum samples showed greater mean activity concentration levels of U-238 and Ra-226 than the international recommended limits, while the recrystallized gypsum demonstrated notably lower activity concentrations for these two isotopes. The activity concentration of Ra-226 in recrystallized gypsum is similar to 6 times lower than in raw phosphogypsum. Therefore, recrystallized gypsum does not present a radiation hazard when used as a building material, while raw phosphogypsum meets the requirements only for road construction materials.",
publisher = "Mineralogical Soc, Twickenham",
journal = "Clay Minerals",
title = "Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering",
pages = "70-63",
number = "1",
volume = "55",
doi = "10.1180/clm.2020.11"
}

Isek, J., Kaludjerović, L., Vuković, N. S., Milošević, M., Vukašinović, I.,& Tomić, Z.. (2020). Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering. in Clay Minerals
Mineralogical Soc, Twickenham., 55(1), 63-70.
https://doi.org/10.1180/clm.2020.11

Isek J, Kaludjerović L, Vuković NS, Milošević M, Vukašinović I, Tomić Z. Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering. in Clay Minerals. 2020;55(1):63-70.
doi:10.1180/clm.2020.11 .

Isek, Josip, Kaludjerović, Lazar, Vuković, Nikola S., Milošević, Maja, Vukašinović, Ivana, Tomić, Zorica, "Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering" in Clay Minerals, 55, no. 1 (2020):63-70,
https://doi.org/10.1180/clm.2020.11 . .

TY  - JOUR
AU  - Kaludjerović, Lazar
AU  - Isek, Josip
AU  - Vuković, Nikola
AU  - Milošević, Maja
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4949
AB  - In this study, the chemical and phase composition of two samples of phosphogypsum from the waste dumps of the Industry of Chemical Products "Elixir - Prahovo" (Serbia) were examined, as well as the possibility of recrystallization of gypsum from an aqueous suspension of phosphogypsum. 'the negative effect of higher temperatures on the solubility of calcium sulfate (13.08 mmol/dm(3) at 95 degrees C vs. 15.43 mmol/dm(3) at 40 degrees C) was utilized. In several repeated cycles, calcium sulfate component was progressively dissolved in water at room temperature and then precipitated at 100 degrees C, using the same liquid phase throughout the experiment. Therefore, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant, and the mass balance for the experiment was calculated. Elemental, XRD and SEM-EDS analyses were performed on raw phosphogypsum, purified gypsum and insoluble residue. The whiteness of raw phosphogypsum and purified gypsum were determined and compared. The main objective of the study was to investigate the nature of insoluble impurities, in order to define and optimize the methods for their removal during a potential industrial processing of phosphogypsum.
PB  - Polish Mineral Eng Soc, Krakow
T2  - Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
T1  - Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste
EP  - 78
IS  - 1
SP  - 73
DO  - 10.29227/IM-2019-01-13
ER  - 

@article{
author = "Kaludjerović, Lazar and Isek, Josip and Vuković, Nikola and Milošević, Maja",
year = "2019",
abstract = "In this study, the chemical and phase composition of two samples of phosphogypsum from the waste dumps of the Industry of Chemical Products "Elixir - Prahovo" (Serbia) were examined, as well as the possibility of recrystallization of gypsum from an aqueous suspension of phosphogypsum. 'the negative effect of higher temperatures on the solubility of calcium sulfate (13.08 mmol/dm(3) at 95 degrees C vs. 15.43 mmol/dm(3) at 40 degrees C) was utilized. In several repeated cycles, calcium sulfate component was progressively dissolved in water at room temperature and then precipitated at 100 degrees C, using the same liquid phase throughout the experiment. Therefore, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant, and the mass balance for the experiment was calculated. Elemental, XRD and SEM-EDS analyses were performed on raw phosphogypsum, purified gypsum and insoluble residue. The whiteness of raw phosphogypsum and purified gypsum were determined and compared. The main objective of the study was to investigate the nature of insoluble impurities, in order to define and optimize the methods for their removal during a potential industrial processing of phosphogypsum.",
publisher = "Polish Mineral Eng Soc, Krakow",
journal = "Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society",
title = "Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste",
pages = "78-73",
number = "1",
doi = "10.29227/IM-2019-01-13"
}

Kaludjerović, L., Isek, J., Vuković, N.,& Milošević, M.. (2019). Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste. in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
Polish Mineral Eng Soc, Krakow.(1), 73-78.
https://doi.org/10.29227/IM-2019-01-13

Kaludjerović L, Isek J, Vuković N, Milošević M. Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste. in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society. 2019;(1):73-78.
doi:10.29227/IM-2019-01-13 .

Kaludjerović, Lazar, Isek, Josip, Vuković, Nikola, Milošević, Maja, "Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste" in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society, no. 1 (2019):73-78,
https://doi.org/10.29227/IM-2019-01-13 . .