Investigation of the changes of P 2O 5 content of phosphate rock during simultaneous calcination/sulfation

• Published in: Powder technology Vol. 211; no. 1; pp. 72 - 76
• Main Authors: Sınırkaya, Melike, Özer, A. Kadir, Gülaboglu, M. Sahin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• Subjects: Flue gas desulfurization; Fluidized bed; Phosphate rock; Phosphate rock; Flue gas desulfurization; Fluidized bed
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2011.03.036

In this study, the changes of P 2O 5 content of phosphate rock during simultaneous calcination/sulfation in a fluidized-bed were investigated. P 2O 5 determination was carried out on samples with and without quenching of sulfated rock. The effects of the temperature and particle size on P 2O 5 content of either sample were determined. It was found that the decrease in process temperature favorably increased the P 2O 5 content of the sulfated samples. Since the calcination was the dominant reaction during the early stages of the process, there was an initial increase in P 2O 5 content of the sulfated samples. However, at later stages, there was a decrease in P 2O 5 extent of sulfated samples with an increase in the extent of CaSO 4 formed during the reaction. The P 2O 5 extent, on the other hand, increased with decreasing particle size. The results showed that P 2O 5 content of 23.27% in raw ore may be increased up to 36% following the quenching of sulfated samples. In this study, the changes of P 2O 5 content of phosphate rock during simultaneous calcination/sulfation in a fluidized-bed were investigated. Since the calcination was the dominant reaction during the early stages of the process, there was an initial increase in P 2O 5 content of the sulfated samples. However, at later stages, there was a decrease in P 2O 5 extent of sulfated samples with an increase in the extent of CaSO 4 formed during the reaction. [Display omitted] ► The increase in the rate of CaO formed as a result of calcination caused an increase in P 2O 5 content. ► The increase of sulfation rate resulted in a decrease in P 2O 5 content. ► P 2O 5 content of 23.27% in raw ore may be increased up to 36% following the quenching of sulfated samples.