高纯钠基蒙脱石的剥离及其表征

Delaminating and Characterizing of High Purity Sodium Montmorillonite

采用低速搅拌、超声作用、高速搅拌及添加剥离助剂方式进行不同组合后对高纯钠基蒙脱石进行剥离研究。分别采用X射线衍射仪(XRD)和X射线荧光仪(XRF)分析样品的物相及化学组分;采用热场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)及原子力显微镜(AFM)表征样品表观形貌及颗粒大小。研究结果表明超声作用优于低速搅拌作用;添加分散剂六偏磷酸钠有利于蒙脱石的剥离;试验条件下质量浓度为2.5%的高纯钠基蒙脱石矿浆经30 min超声作用后低速搅拌30 min,接着高速搅拌30 min后所得产物的剥离效果最佳。

The delamination of high-purity Na-montmorillonite was studied by different combinations of low-speed stirring,ultrasonic action,high-speed stirring and addition of delaminating agent.XRD and XRF were used to analyze the phase and chemical composition of the samples.Thermal field emission scanning electron microscopy(SEM),transmission electron microscopy(TEM)and atomic force microscopy(AFM)were used to characterize the apparent morphology and particle size of the samples.The results showed that the effect of ultrasonic action was superior to that of high-speed stirring.The addition of dispersing agent sodium hexametaphosphate was beneficial to the delamination of montmorillonite.Under the experimental conditions,the high-purity sodium montmorillonite slurry with mass concentration of 2.5%was stirred at low speed for 30 min after 30 min ultrasonic treatment,and then to be stirred at high speed for 30 min,so the best delaminating effect was got at last.