粉煤灰免烧陶粒制备及其重金属废水净化性能

摘要重金属废水对环境的污染已经引起科研人员的广泛关注。以粉煤灰和水泥为原料、添加活性成分FeS，制备一种免烧陶粒用于含重金属Cu2＋、Zn2＋、Pb2＋的废水处理。探讨了物料配比及蒸养时间对陶粒筒压强度及其比表面积的影响；研究了固液比、接触时间、pH、温度及初始溶液浓度等因素对Cu2＋、Zn2＋、Pb2＋离子净化效果的影响规律，并对实验结果进行了等温线拟合。XRD分析显示，免烧陶粒中存在Ca（OH）2、C—D—H、FeS等矿物相，对重金属离子具有非常好的固定化作用。该免烧陶粒对重金属离子具有很好的去除效果，具备较好的应用前景。

Preparation of non-sintered ceramsite from coal fly ash and its performance on heavy metals removal

Environmental pollution from heavy metals contamination has attracted more and more attention from researchers and engineers. A novel non-sintered ceramsite was prepared using coal fly ash and cement as raw materials and FeS as the activating agent to treat the wastewaters contaminated by Cu2＋ , Zn2＋ and Pb2＋ The effects of materials ratio and steaming time on the ceramsite intensity and specific surface area were investi- gated, and the effects of five major factors （solid/liquid ratio, contact time, pH value, temperature and initial concentration） on the removal efficiency of heavy metals （Cu2 ＋ , Zn2＋ and Pb2＋ ） were examined in detail. The experimental results fitted the adsorption isotherm according to Langmuir and Freundlich models. The XRD ana- lyses demonstrated that new crystal minerals such as Ca（OH） 2, C--S--H and FeS emerged in the non-sintered ceramsite, which was helpful to remove the heavy metals. This non-sintered ceramsite presented good perform- ance on the removal of heavy metals and good application prospect can be expected in the future.