<br>胶结膏体回填体磷石膏中磷和氟的保留：实验和数值模拟研究,Environmental Research

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胶结膏体回填体磷石膏中磷和氟的保留：实验和数值模拟研究
Environmental Research ( IF 7.7 ) Pub Date : 2022-07-10 , DOI: 10.1016/j.envres.2022.113775
Yikai Liu ₁ , Qiusong Chen ₂ , Maria Chiara Dalconi ₁ , Simone Molinari ₁ , Luca Valentini ₁ , Yunmin Wang ₂ , Shiyuan Sun ₃ , Peishen Wang ₃ , Gilberto Artioli ₁

Affiliation

使用胶结浆体回填（OCPB）对磷石膏进行固化/稳定，为回收磷石膏库存提供了一种低成本的替代原位技术。但 OCPB 远未获得污染物会根据动态环境条件重新分配的稳定状态。此外，污染物（氟和磷）的溶解度控制相的相关化学相互作用和矿物学信息尚未得到彻底研究或完全理解。在本研究中，使用耦合化学、矿物学和形态学分析的框架来确定固定化 OCPB 的氟化物和磷酸盐保留机制。然后，将 pH 依赖性浸出测试和数值模拟作为有用的工具来识别控制稳定 OCPB 浸出行为的矿物。总体研究结果证明，富含铝酸盐的硅酸钙水合物在氟化物和磷酸盐保留中起着至关重要的作用。实验和模拟酸中和和浸出曲线都表明，水泥基体是一种强大的缓冲材料，可确保氟和磷保留所需的高 pH 条件。尽管在高酸性条件下观察到绝对氟和磷浸出值存在差异，但模拟能够描述高度两性浸出行为。模拟表明，铝种类和磷酸钙分别控制氟和磷的溶解度。这项工作的结果将对预测 OCPB 在有害和多重环境中的浸出行为具有意义。

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Retention of phosphorus and fluorine in phosphogypsum for cemented paste backfill: Experimental and numerical simulation studies

The solidification/stabilization of phosphogypsum using cemented paste backfill (OCPB) provides a low-cost and alternative in-situ technique for recycling phosphogypsum stockpiles. But the OCPB is far from obtaining steady states in which the pollutants would redistribute as a response to dynamic environmental conditions. Further, the associated chemical interactions and the mineralogy information of the solubility-controlling phases of contaminants (fluorine and phosphorus) have not been thoroughly studied or fully understood. In this study, a framework coupling the chemical, mineralogical, and morphological analyses is used to determine the fluoride and phosphate retention mechanisms of immobilized OCPB. Then the pH-dependent leaching tests and numerical simulation is applied as a useful tool to identify the minerals controlling stabilized OCPB leaching behavior. The overall findings proved that aluminate-rich calcium silicate hydrates play an essential role in fluoride and phosphate retention. Both experimental and simulational acid neutralization and leaching curves indicate that the cementitious matrix works as a strong buffering material ensuring high pH conditions that are necessary for fluorine and phosphorus retention. Although discrepancies were observed in absolute fluorine and phosphorus leaching values at highly acidic conditions, the simulations are able to describe highly amphoteric leaching behavior. The simulation suggests that the aluminum species and calcium phosphates governed the solubility of fluorine and phosphorus, respectively. The results of this work would have implications for predicting the leaching behavior of OCPB in detrimental and multiple environments.

更新日期：2022-07-10

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