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

MOX燃料製造工程における回収粉の粒度調整のための衝突板式粉砕機の粉砕特性

川口 浩一  ; 瀬川 智臣 ; 山本 和也; 牧野 崇義 ; 磯 秀敏 ; 石井 克典 

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

資源の有効利用とPu在庫低減のために、燃料製造における規格外ペレットのリワークが必要である。乾式回収粉の粒径及び原料粉への添加率を調整することで、密度降下剤無しでペレットの焼結密度をコントロールできる。衝突板式粉砕機の分級ゾーンと粉砕室を分離し、分級と粉砕を段階的に行うことで、粉砕室における粒子の粉砕特性を評価した。分級・粉砕を5サイクルを繰り返す間にピーク粒径が徐々に減少した。望ましい粒径の粒子を主要成分にもつ粉砕粉が得られる粉砕機として衝突板式粉砕機は有望である。

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.