Germanium (Ge), a waste residue leaching from zinc (Zn) smelting process, has potential cementitious properties and could be recycled as a cement supplement activated by chemical reagents. In this work, a test was conducted to determine the hydration properties of Ge slag-cement-based composites with Ge slag (GS)/ordinary Portland cement (PC) contents of 0wt%, 5wt%, 10wt%, 15wt%, 20wt%, and 25wt% and water-to-binder ratio (w/b) of 0.4. The activators Ca(OH)₂, AlCl₃, NaAlO₂, and Na₂CO₃ were mixed under 1wt%, 2wt%, 3wt%, and 4wt% dosages of GS weight. The composition and microstructure of the hydration products were investigated by the combined approaches of X-ray diffraction (XRD), thermogravimetry–differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). First, the GS cementitious property is attributed to the high content of CaSO₄•2H₂O. Second, the activators affected the acceleration performance in the following order: NaAlO₂, Na₂CO₃, AlCl₃, and Ca(OH)₂. More importantly, the 28-day unconfined compressive strength (UCS) is 45.34 MPa at the optimum formula of 0.6wt% NaAlO₂, 15wt% GS, and 85wt% PC, which is 9.16% higher than the control. Thus, NaAlO₂ is beneficial for the ettringite (AFt) generation, resulting in the C–S–H structure compaction. However, the Zn²⁺ residue inhibited the AFt formation, representing an important challenge to the strength growth with curing age. Consequently, the GS could be recycled as a supplement to the cement under the activator NaAlO₂.

锗（Ge）是一种从锌（Zn）冶炼过程中浸出的废渣，具有潜在的胶凝特性，可以作为化学试剂活化的水泥补充剂进行回收利用。在这项工作中，进行了一项测试，以确定Ge渣（GS）/普通硅酸盐水泥（PC）含量为0wt％，5wt％，10wt％，15wt％，20wt％的Ge渣水泥基复合材料的水化性能。 ，重量比为25％，水与粘合剂的比例（w / b）为0.4。活化剂Ca（OH）₂，AlCl ₃，NaAlO ₂和Na ₂ CO ₃在1wt％，2wt％，3wt％和4wt％剂量的GS重量下混合。通过X射线衍射（XRD），热重分析-差示扫描量热法（TG-DSC），扫描电子显微镜（SEM）和能量色散X射线光谱法（X-射线衍射（XRD），热重分析-差示扫描量热法（TG-DSC））的组合方法研究了水合产物的组成和微观结构（ EDS）。首先，GS的胶凝性能归因于CaSO ₄ •2H ₂ O的高含量。其次，活化剂按以下顺序影响加速性能：NaAlO ₂，Na ₂ CO ₃，AlCl ₃和Ca（OH）₂。更重要的是，28天无侧限抗压强度（UCS）是45.34兆帕以0.6重量％的NaAlO最佳配方₂，15wt％的GS，和85重量％的PC，这比对照高9.16％。因此，NaAlO ₂有利于钙矾石（AFt）的产生，从而导致C–S–H结构的致密化。然而，Zn ²⁺残留物抑制了AFt的形成，对随着固化时间的增长而产生了重要的挑战。因此，GS可以作为活化剂NaAlO ₂下的水泥的补充物再循环。