粉煤灰免燒陶粒制備及其重金屬廢水凈化性能

更新時(shí)間：2014-07-15 10:45 來源：環(huán)境工程學(xué)報(bào) 作者: 閱讀：1744

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(shí)間對陶粒筒壓強(qiáng)度及其比表面積的影響;研究了固液比、接觸時(shí)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(shí)驗(yàn)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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