This work turned industrial waste of magnesium slag (MS) into two value-added products, high-purity vaterite and supplementary cementitious materials, through “leaching-carbonation” method. The various parameters on the leaching rate of Ca²⁺ from MS by using NH₄Cl solution were investigated. The spherical vaterite with high purity of 96.5 % and high surface area (27.89 m²/g) could be successfully produced through wet carbonation of leachate with addition of glycine as crystal modifiers. In addition, the leachate solid residue (LSR) obtained from leaching process of MS had a smaller size destruction and higher surface area in comparison to Portland cement, resulting in an accelerated hydration process. The amorphous silica gel in LSR had a high pozzolanic effect, which resulted in a higher compressive strength development and refined pore structure in comparison to control samples. This work provides a novel treatment and can realize the high value-added utilization of MS.

该工作通过“浸出-碳化”方法将工业废料镁渣（MS）转化为高纯球霰石和辅助胶凝材料两种增值产品。研究了不同参数对NH ₄ Cl溶液MS中Ca ²⁺浸出率的影响。通过对浸出液进行湿式碳化并添加甘氨酸作为晶体改性剂，可以成功地制备出纯度为96.5%、高比表面积（27.89 m ^{2 /g）的球形球霰石。}此外，与波特兰水泥相比，MS浸出过程中获得的渗滤液固体残渣（LSR）具有更小的尺寸破坏和更高的表面积，从而加速了水化过程。LSR 中的无定形硅胶具有较高的火山灰效应，与对照样品相比，具有更高的抗压强度和细化的孔隙结构。这项工作提供了一种新颖的治疗方法，可以实现MS的高附加值利用。