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    • Phosphogypsum Decomposition Desulfurization: Why Difficult

    Pengxing Yuan, Meng Li,Shiyi Chen,Wenguo Xiang

    JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING（2025）

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    Abstract
    The key to the industrialization of fluidized phosphogypsum (PG) decomposition technology lies in maximizing PG desulfurization (SO2). This study identifies the reasons limiting PG desulfurization and corresponding strategies through multidimensional analysis involving reactor design, unit operation, and steady-state simulation. The results indicate that the treatment capacity of PG pellets in a batch bubbling decomposition reactor reached a maximum of 650 g/h. The one-step decomposition method of PG enhances the decomposition desulfurization of PG by utilizing the synergistic effect of coal and oxygen (O2). When the O2 concentration is 1 %, adjusting the PG/coal mass ratio in the range of 10:1-7.5:1, the PG desulfurization rate (alpha) maintains at 93.08 %-93.22 %. The steady-state model based on Gibbs free energy minimization principle is suitable for predicting the one-step decomposition desulfurization process of PG. The simulated value (93.85 %) of alpha is slightly higher than the test value, and the molar concentration of SO2 in the gas phase product is 51.41 %. The release of detachable substances inhibits the decomposition desulfurization of PG, because behaviors such as the vaporization of crystallization water, the volatilization of adhesives, and the thermal decomposition of CaSO4 cause instability in the sulfur release temperature and imbalance in the system gas-phase partial pressure. Roasting helps to remove detachable substances from PG pellets, and the optimal roasting temperature should be determined between 550 degrees C and 825 degrees C.
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    Key words
    Phosphogypsum,Waste,Desulfurization,Fluidized bed,Test,Simulation
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