The low-temperature wet oxidation behavior of semi-dry desulfurization ash from iron ore sintering flue gas in ammonium citrate solution was investigated for efficiently utilizing the low-quality desulfurization ash. The effects of the ammonium citrate concentration, oxidation temperature, solid/liquid ratio, and oxidation time on the wet oxidation behavior of desulfurization ash were studied. Simultaneously, the oxidation mechanism of desulfurization ash was revealed by means of X-ray diffraction, Zeta electric resistance, and X-ray photoelectron spectroscopy (XPS) analysis. Under the optimal conditions with ammonium citrate, the oxidation ratio of CaSO₃ was up to the maximum value (98.49%), while that of CaSO₃ was only 8.92% without ammonium citrate. Zeta electric resistance and XPS results indicate that the dissolution process of CaSO₃ could be significantly promoted by complexation derived from the ammonium citrate hydrolysis. As a result, the oxidation process of CaSO₃ was transformed from particle oxidation to SO ²⁻₃ ion oxidation, realizing the rapid transformation of desulfurization ash from CaSO₃ to CaSO₄ at low temperature. It provides a reference for the application of semi-dry desulfurization ash and contributes to sustainable management for semi-dry desulfurization ash.

为了有效利用劣质脱硫灰，研究了铁矿石烧结烟气中半干式脱硫灰在柠檬酸铵溶液中的低温湿氧化行为。研究了柠檬酸铵浓度，氧化温度，固液比和氧化时间对脱硫灰分湿式氧化行为的影响。同时，通过X射线衍射，Zeta电阻和X射线光电子能谱（XPS）分析揭示了脱硫灰分的氧化机理。根据与柠檬酸铵的最佳条件，硫酸钙的氧化率₃达最大值（98.49％），而硫酸钙的₃枸rate酸铵含量仅为8.92％。Zeta电阻和XPS结果表明，柠檬酸铵水解产生的络合作用可以显着促进CaSO ₃的溶解过程。其结果是，硫酸钙的氧化过程₃从粒子氧化转化为SO ^2- ₃离子氧化，实现脱硫灰从的CaSO迅速转变₃到的CaSO ₄在低温下。它为半干式脱硫灰的应用提供了参考，并为半干式脱硫灰的可持续管理做出了贡献。