The inevitably incorporation of P₂O₅ impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable approach to remove the impurity in the PG and improve the quality of SSC. In this study, the effect of neutralisation process under different lime concentration and times on removability of P₂O₅ in PG was examined. Moreover, both fresh properties, hardened properties and microstructure of PG-based SSC pastes were investigated, and the mechanism behind was explored as well. The results indicated that lime neutralisation successfully removed the P₂O₅ and improved the pH value of PG, and the minimal requirement to remove P₂O₅ was only 2% Ca(OH)₂. Moreover, for PG-incorporated SSC, the hydration process was significantly accelerated and the setting time was shortened by neutralising the PG with lime. The compressive strength of the PG-incorporated SSC was also improved by lime neutralisation. Under comprehensive consideration, 5% Ca(OH)₂ was selected as the optimised content for lime neutralisation of PG, which efficiently improved the compressive strength of SSC by removing the P₂O₅ impurity in PG.

不可避免地掺入P ₂ O _5会导致磷石膏（PG）的质量较差，这进一步阻碍了PG在生产几乎完全由工业制成的环保节能水泥（SSC）中的利用。浪费。石灰中和提供了一种可持续的方法来去除PG中的杂质并提高SSC的质量。在本研究中，不同石灰浓度和时间下中和过程对P ₂ O ₅去除率的影响在PG中进行了检查。此外，还研究了基于PG的SSC糊的新鲜性能，硬化性能和微观结构，并探讨了其背后的机理。结果表明，石灰中和成功去除了P ₂ O ₅并提高了PG的pH值，而去除P ₂ O ₅的最低要求仅为2％Ca（OH）₂。此外，对于掺有PG的SSC，通过用石灰中和PG，水合过程显着加速，凝结时间缩短。石灰中和还改善了掺入PG的SSC的抗压强度。综合考虑，5％Ca（OH）₂选择PG作为PG石灰中和的最佳含量，通过去除PG中的P ₂ O ₅杂质有效地提高了SSC的抗压强度。