热处理富凹凸棒石白云岩去除与固定水中重金属的作用和机理

Dolomite rock rich palygorskite occurs widely in palygorskite clay mine, which has from nanometer to micrometer interparticle pore and very high activity of thermal chemical reaction, and there is huge application potential and research worth in the removal of heavy metal. The project objectives are to: inquiry the reactivity of removal typical heavy metal with thermal treatment products of the dolomite rich palygorskite through batch experiment and column; reveal the relationship among the thermal treatment condition and dynamics, kinetics and capability of removal heavy metal as well as effluent pH; understand occurrence state of heavy metal in solid and mechanism of removing heavy metal with thermal treatment products of the dolomite rich palygorskite through the characterization of XRD, XPS and TEM; investigate occurrence phase, stability and stabilizing mechanism of heavy metal in solid after hydrothermal treatment of different temperature conditions through XRD, XPS, TEM and hydrothermal, leaching and extracting after sorption heavy metal. The results will provide base for developing novel technology about purity and recovery heavy metal in water and stabilization heavy metal in solid waste as well as high value application of the dlomite rock rich palygorskite.

凹凸棒石粘土矿中普遍存在的富凹凸棒石白云岩具有纳米-微米粒间孔隙和较高的热化学活性，在去除水中重金属方面有巨大潜力和研究价值。本项目拟通过静态和动态实验，探讨该类白云岩热处理产物去除水中典型重金属离子的反应活性，揭示热处理条件与其净化水中重金属作用的动力学、热力学、容量和出水pH值的内在联系；通过对处理重金属废水后得到的固体物质的XRD、XPS、TEM分析，揭示重金属在固体中的赋存状态，探讨热处理富凹凸棒石白云岩去除水中重金属的作用机理；通过对含重金属固体产物再次不同温度下水热处理后固体物相XRD、XPS、TEM分析及淋溶、分级提取，揭示重金属离子在水热处理后固体中寄主物相、重金属在固体产物中的稳定性和稳定化机理。为水中重金属的净化、回收、含重金属废物的稳定化处理提供新型纳米功能材料和技术途径，为富凹凸棒石白云石矿石高值化利用奠定理论基础。

研究了富凹凸棒石白云岩的纳米矿物特性、微结构特征，热处理富凹凸棒石白云岩产物结构、组成、反应活性与其温度的关系。拟通过静态实验和动态柱实验，探讨了该类白云岩热处理产物在去除水中典型重金属离子的反应活性，揭示热处理条件与其净化水中重金属作用的动力学、热力学、容量和出水pH值的内在联系；通过对净化重金属后固体物质的XRD、XPS、TEM分析，揭示重金属在固体中的赋存状态，探讨其热处理产物净化重金属的作用机理。为水中重金属的净化、回收、含重金属废物的稳定化处理提供了新型纳米功能材料和技术途径，为富凹凸棒石白云石矿石高值化利用奠定了理论基础。在国际SCI刊物发表论文6篇，在国内中文核心刊物发表学术论文5篇，申请发明专利6项，已获得授权发明专利4项。同时，支撑了5名硕士研究生培养。本项目组参加国内各类全国性学术交流会议16人次，做学术交流报告4次，进行了广泛的学术交流。