Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; College of Resource and Environmental Science, Chongqing University, Chongqing 40044, PR China.
Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; College of Resource and Environmental Science, Chongqing University, Chongqing 40044, PR China.
Waste Manag. 2019 Oct;98:135-143. doi: 10.1016/j.wasman.2019.08.024. Epub 2019 Aug 22.
The predominant heavy metals in MSWI fly ash and electrolytic manganese residue (EMR) were determined to be Zn, Pb, Cd, and Mn, with lesser amounts of Cu and Cr. The curing efficiency of heavy metals in MSWI fly ash and EMR was improved using complex alkaline activators (NaOH and KOH), base addition (calcium hydroxide and complex Portland cement), and EMR calcining (at 800 °C for 3 h) based on a geopolymeric system. The best formulation of the geopolymeric system was composed of 75 wt% MSWI fly ash and 25 wt% EMR with a KOH/NaOH (1:1) complex solution (7.5 M OH)/solid of 0.5. Calcium ions were dissolved aluminosilicate under the strongly basic conditions to form complex products (ternesite) which further improved the strength. The primary curing mechanism of heavy metals (Pb, Zn, Cd, Mn, Cr, and Cu) mainly was primarily influenced by the acid-base buffering capacity of geopolymers, followed by the physical encapsulation of geopolymeric gels.
主要重金属在 MSWI 飞灰和电解锰渣（EMR）中被确定为 Zn、Pb、Cd 和 Mn，还有少量的 Cu 和 Cr。通过使用复合碱性激活剂（NaOH 和 KOH）、碱添加（氢氧化钙和复合波特兰水泥）和基于地质聚合物系统的 EMR 煅烧（在 800°C 下煅烧 3 小时），提高了 MSWI 飞灰和 EMR 中重金属的固化效率。地质聚合物系统的最佳配方由 75wt% MSWI 飞灰和 25wt% EMR 组成，其中含有 KOH/NaOH（1:1）复合溶液（7.5M OH）/固体的比例为 0.5。在强碱条件下，钙离子溶解了铝硅酸盐，形成了复杂的产物（ternesite），这进一步提高了强度。重金属（Pb、Zn、Cd、Mn、Cr 和 Cu）的主要固化机制主要受地质聚合物的酸碱缓冲能力影响，其次是地质聚合物凝胶的物理封装。
