煅烧白云石凹凸棒石粘土的除磷作用  

Performance of Calcined Domolite-Palygorskite Clay on Phosphate Removal

作　　者：朱宇珂 陈天虎[1] 谢晶晶[1] 刘海波[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,纳米矿物与环境材料实验室,安徽合肥230009

出　　处：《高校化学工程学报》2016年第1期248-251,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(41102023);安徽省国土资源厅科技项目(2013-K-08);博士后基金(2014M560504)

摘　　要：考察了不同温度煅烧白云石凹凸棒石粘土(DPC)对水中磷去除效果的影响。煅烧DPC对磷的去除作用通过XRD、TEM进行分析,同时测定Ca^(2+)、Mg^(2+)、p H值。高于500℃白云石开始分解,产物为方解石、羟钙石、方镁石、斜硅钙石。静态实验结果表明DPC煅烧温度越高,溶液p H值及钙离子浓度越高,磷酸盐去除率越好。说明Ca^(2+)对磷酸根的去除起到了关键作用,沉淀作用是主要的除磷机制。动态实验结果表明,550℃煅烧DPC颗粒滤料6个月内除磷效率接近100%,出水p H在30天后稳定在8~9左右。显示在该温度范围内煅烧DPC可以获得高效除磷而又满足出水p H排放要求的颗粒材料,具有潜在应用价值。The effect of calcination temperature on the performance of dolomite-palygorskite clay（DPC） on phosphate removal from aqueous solution was studied. The removal efficiency of calcined DPC was characterized by X-ray Diffraction（XRD） and Transmission Electron Microscope（TEM）, and the concentration of Ca^2＋ and Mg^2＋, and p H of the solution were measured. Dolomite decomposed into calcite, portlandite, periclase and larnite when the temperature was above 500℃. The results show that the increase of calcination temperature can result in p H and Ca^2＋ concentration increase, and the phosphate removal rate is also increased. The dissolved Ca^2＋ played a crucial role in removing phosphate and precipitation was regarded as the main mechanism. The results of flowing column experiments show that phosphate removal rate is close to 100% in 6 months with DPC calcined at 550℃, and the effluent p H is around 8 to 9 after running for 30 days. The experimental data is helpful for the utilization of calcined DPC as a promising material for phosphate removal.

关 键 词：白云石 凹凸棒石粘土 除磷 动态柱 

分 类 号：X754[环境科学与工程—环境工程]