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1·When density of precipitated slurry is too high, because of the collision among particles, big spindly aggregates which are made of ultra-fines are born in reactor at the action of surface energy.

当体系中浆液密度较高时，颗粒由于相互间的碰撞在表面能的作用下团聚成纺锤形的大颗粒。