Pulverization characteristics of a collision plate type jet mill for particle size adjustment of recovered powder in the MOX fuel fabrication process

Kawaguchi, Koichi  ; Segawa, Tomoomi ; Yamamoto, Kazuya; Makino, Takayoshi ; Iso, Hidetoshi ; Ishii, Katsunori 

The reworking of out of specification pellets is required for the effective use of nuclear fuel material and for reduction of the plutonium inventory in fuel fabrication facilities. It is known that the sintering density of mixed oxide pellets can be controlled without a pore-former by controlling the amount and particle size of the recovered powder in the raw powder. The collision plate type jet mill was separated into the classifier and the mill chamber, and these modules were used independently. The peak position shifted to smaller sizes gradually over the five cycles of classification and pulverization. The collision plate type jet mill is a promising form of equipment to obtain particles with objective sizes as the main component of a powder.