粉煤灰免燒陶粒制備及其重金屬廢水凈化性能
更新時間：2014-07-15 10:45
來源：環(huán)境工程學(xué)報
作者:
閱讀：1693
| 中文摘要: |
| 重金屬廢水對環(huán)境的污染已經(jīng)引起科研人員的廣泛關(guān)注。以粉煤灰和水泥為原料、添加活性成分FeS,制備一種免燒陶粒用于含重金屬Cu2+、Zn2+、Pb2+的廢水處理。探討了物料配比及蒸養(yǎng)時間對陶粒筒壓強度及其比表面積的影響;研究了固液比、接觸時間、pH、溫度及初始溶液濃度等因素對Cu2+、Zn2+、Pb2+離子凈化效果的影響規(guī)律,并對實驗結(jié)果進(jìn)行了等溫線擬合。XRD分析顯示,免燒陶粒中存在Ca(OH)2、C—S—H、FeS等礦物相,對重金屬離子具有非常好的固定化作用。該免燒陶粒對重金屬離子具有很好的去除效果,具備較好的應(yīng)用前景。 |
| 英文摘要: |
| 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 investigated, 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 analyses 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 performance on the removal of heavy metals and good application prospect can be expected in the future. |
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