Ceramsite made from BOF (basic oxygen furnace) slag was used in column test to deal with aquatic phosphate. The objective of this study was to identify the phosphorus (P) removal mechanisms of slag ceramsite and to evaluate its potential use in efficient phosphorus adsorption filter. The relationships of Ca²⁺, pH and phosphorus removal, as well as filler regeneration were investigated. Chemical extraction, SEM-EDX, XRD, FTIR, XPS were employed to determine the mechanisms of phosphorus removal. The slag-ceramsite column showed good adaptability for low strength phosphate. Results demonstrated that suitable HRT facilitated the efficient phosphorus removal for stable and long-term operating. As HRT was 2.8 h and influent PO₄-P was 10 mg/L, the P-uptake capacity of ceramsite filler was 10.5 mg/g in 158 days. The P-uptake mechanisms of slag-ceramsite filler including surface adsorption, Ca²⁺/OH- release, and chemical precipitation. Weakly adsorptive phosphorus and precipitated calcium phosphate were dominant in the sequestered phosphorus. Amorphous Ca-deficient hydroxyapatite (CDHA) and carbonated hydroxyapatite (CO₃-HA) were the dominant calcium phosphate phases. The exhausted ceramsite filler could be regenerated by NaHCO₃ elution and calcination process.

由BOF（碱性氧气炉）炉渣制成的陶粒用于柱试验以处理水生磷酸盐。这项研究的目的是确定矿渣陶粒中磷（P）的去除机理，并评估其在高效磷吸附滤池中的潜在用途。研究了Ca 2 ⁺，pH和除磷与填料再生之间的关系。用化学萃取，SEM-EDX，XRD，FTIR，XPS来确定除磷的机理。炉渣陶粒柱对低强度磷酸盐具有良好的适应性。结果表明，合适的HRT有助于有效去除磷，从而实现稳定和长期的运行。由于HRT为2.8小时且进水PO ₄-P为10mg / L，在158天内，陶粒填料的P吸收容量为10.5mg / g。矿渣陶粒填料的P吸收机理包括表面吸附，Ca ²⁺ / OH-释放和化学沉淀。弱吸收性磷和沉淀的磷酸钙在螯合磷中占主导地位。非晶态缺钙的羟基磷灰石（CDHA）和碳酸化的羟基磷灰石（CO ₃ -HA）是主要的磷酸钙相。耗尽的陶粒填料可以通过NaHCO ₃洗脱和煅烧过程进行再生。