Institute of Environmental Assessment and Water Research, Jordi Girona 18, 08034-Barcelona, Spain.
J Hazard Mater. 2010 Apr 15;176(1-3):623-8. doi: 10.1016/j.jhazmat.2009.11.075. Epub 2009 Nov 18.
This study deals with the synthesis of geopolymers from co-fired fly ash and blast furnace slags. Geopolymer bodies were simultaneously synthesized in open and closed curing conditions in order to elucidate the role of this parameter on their resultant properties. Open curing conditions produce solid bodies characterized by high porosity, low compressive strength and exacerbated leaching of certain oxyanionic metalloids. By contrast, protected curing promotes the binder development, giving rise to higher strength and less porous systems. This imposes physical restrictions to leaching which decreases and/or retards releases of oxyanionic metalloids in comparison to open curing conditions. Fly ash-slag-based geopolymers may immobilize a number of trace pollutants such as Be, Bi, Cd, Co, Cr, Cu, Nb, Ni, Pb, REE, Sn, Th, U, Y and Zr, regardless of the curing conditions. Due to geopolymers displaying weak assimilation capacity for oxyanionic species, their successful regarding oxyanionic retention is strongly dependent on porosity and therefore on curing conditions applied.
本研究涉及共烧粉煤灰和高炉渣制备地聚合物。为了阐明该参数对其性能的影响，在开放和封闭养护条件下同时合成了地聚合物体。开放养护条件下生成的固体具有高孔隙率、低抗压强度和某些含氧阴离子类金属浸出加剧的特点。相比之下，受保护的养护促进了粘结剂的发展，从而形成更高强度和低孔隙度的体系。这对地聚合物的浸出施加了物理限制，与开放养护条件相比，浸出减少和/或延迟了含氧阴离子类金属的释放。基于粉煤灰-矿渣的地聚合物可以固定许多痕量污染物，如 Be、Bi、Cd、Co、Cr、Cu、Nb、Ni、Pb、REE、Sn、Th、U、Y 和 Zr，无论养护条件如何。由于地聚合物对含氧阴离子物种的同化能力较弱，其成功保留含氧阴离子的能力强烈依赖于孔隙率，因此也强烈依赖于所施加的养护条件。
