含砷废渣作为一种持久性污染物被广泛关注，固化／稳定化技术是治理含砷废渣的一种行之有效的途径。对硅酸盐水泥基胶凝材料固砷效果以及其固化机理等方面的研究进行了综述，水泥水化过程中产生的大量Ca（OH）2与可溶性砷酸盐反应生成较为稳定的砷酸钙盐，降低砷的浸出浓度，从而实现砷的有效固化，但其存在污染物包容量小、耐久性差等缺点。本课题组提出了利用地聚物水泥（地聚物材料）固化含砷废渣，通过在地聚物材料水化聚合过程中，以同晶取代的方式实现 AsO43－与 SiO44－、AlO45－之间的化学键合，并辅以地聚物材料的高强、耐久性好的优良特性，利用地聚物材料固化含砷废渣实现砷的大容量、持久性地安全稳定固封。
Arsenic-bearing wastes,as a kind of sustaining contaminants,have gained wide attentions.Solidifi-cation/stabilization of arsenic has been currently recognized as an effective way to deal with the arsenic-bearing wastes. The progress on the solidification/immobilization of arsenic using Portland cement is reviewed.The soluble arsenates can react with hydrated lime Ca(OH)2 gained in the hydration process of the Portland cement to form insoluble calcium arsenates,and the arsenic is effectively immobilized in the matrix of Portland cement.But this technique has the disad-vantages such as low waste loading and poor durability.The geopolymer is possibly used in the solidification of arse-nic-bearing wastes by us.The arsenic can be as a network former in a geopolymer system by means of substitution be-tween silicon and arsenic.Moreover,the geopolymer has very excellent properties including high strength,well dura-bility.So the arsenic can be durably immobilized in the structure of geopolymer with high waste loading.
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