【摘要】 研究工业拟薄水铝石的胶溶过程的工艺参数及其胶体颗粒表面的特性.测定了以稀硝酸为胶溶剂的酸分散指数,在n(H+)/n(AlOOH·nH2O)=0 097时拟薄水铝石可以完全胶溶,所得到的溶胶pH值为3 4,TEM观察胶粒为网联的近球形,大小约为20～50nm.通过胶溶过程中电导率的变化和胶体的红外光谱分析,间接表征了胶溶过程中拟薄水铝石胶粒的表面基团的变化.基于多核配合物平衡浓度与pH值的关系分析了胶核形成机理,对胶团的表面电荷特性和双电层结构进行了讨论.更多还原

【Abstract】 The peptizing process parameters of pseudo-boehmite and its colloidal particulate structure are investigated. The acid dispersion indexes （DI） using HNO₃ as peptizing agent was measured, and it was observed that the pseudo-boehmite could be peptized completely at n（H⁺）/n（AlOOH·nH₂O） =0.097, corresponding to the pH value of 3.4. The near-spherical cross-link particulates in the size range of 20～50nm were observed by transmission electron microscopy. The conductivity change and IR spectra of pseudo-boehmite sols reveal indirectly the surface structure evolution of pseudo-boehmite particulates during the peptization. Furthermore, the nucleation mechanism of colloid, the electrical charge characteristics of micelle and the electrical double layers are discussed based on the relationships between the concentration of multinuclear complex and the pH value.更多还原