关键词: 叶蜡石, 高能球磨, 喷雾干燥, 扫描电镜, XRD

Abstract: Spray drying technique combining with high energy ball milling for the preparation of dry dispersed pyrophyllite powders with lamellar or spheroidal structure was studied，and the prepared powders were characterized by X-ray diffraction（XRD） and scanning electron microscope（FE-SEM）.Results showed that：when grounding for a short time and sprayed drying，dispersed pyrophyllite powders with single lamellar structure were got，at the same time，the lamellar structure and crystalline character are the same as original ones，and the length of single lamellar pyrophyllite at long axis direction was at 0.2~1.2 μm with（8±2） nm in thickness.As the increasing of grinding time，pyrophyllite aggregates with spheroidal structure were achieved through spray drying technique，and the single spheroidal aggregate was about 2.5 μm in diameter，which was composed of nano-sized pyrophyllite lamellars.Furthermore，the results of XRD indicated that the spray drying did not induce the crystal structure change.

Key words: pyrophyllite, high energy ball milling, spray drying, scanning electron microscope, X-ray diffraction