The zinc sulphide nano-particles was synthesized by rea ctive precipitation method using zinc acetate and sodium sulfide as raw material s in Impinging Steam-Rotating Packed Bed(IS-RPB).Effects of the operating c onditions of initial impact velocity

high-gravity number and post-treatment c onditions on the average particle size were also studied systematically.The obt ained sample was characterized by scanning electron microscopy(SEM)

transmissi on electron microscope(TEM)

X-ray diffraction(XRD) and laser particle size m easurement.The research results show that the optimal synthesis conditions for the high gravity factor β is greater than 150

the impact muzzle velocity u of is not less than 25 m/s

zinc sulfide crystal lines is 5 nm to 20 nm in diameter and a length of 100 nm to 200 nm

washed with ethanol and dried un der vacuum to prevent hard agglomerates of ZnS.