To make active sense in the preparation of wollastonite acicular powder of high aspect ratio,this article initiatively gained the relation between aspect ratio and isopyknic diameter of acicular powder in wollastonite shattering technology of fluidized bed opposed jet mill by the stati.

Handling the transmission speculum image with image analyzer, and simultaneously introducing such parameters as number average particle diameter, volume average particle diameter and particle diameter distribution width to build up the method characterizing PVC particle diameter size and its distribution.

Although many paper reports the effect of particle characteristic on the properties of cement,no result have been reported on the relationship between the reactive degree of fly ash in cement pastes and particle size volume distribution for fly ash.