Layered coal-series kaolin can be stripped into ultra-fine flake kaolin through the synergistic effect of dimethyl sulfoxide as intercalating agent,methanol as grafting agent,and cetyltrimethylammonium bromide as stripping reagent with the assistance of ultrasonic vibration.All samples are characterized by means of XRD,FT-IR,N2 adsorption-desorption,SEM and EDS.The results indicate that after stripping and calcination,the inter-layer distance of kaolin is enlarged from 0.708 nm to 1.12 nm,and the porosity in the kaolin increases.Moreover,the mesopores with crack shapes are formed in uniform pore size distribution.The oil absorption capacity of calcinated kaolin clay increases to 70-79 g/(100 g),which is greater than 60-73 g/(100 g)of coal-series kaolin clay.No strong acid or base or other corrosive substances are needed in the whole synthesis process,representing an environmental-friendly preparation method for calcinated kaolin clay.
维普
万方数据