In order to specify a device (1) and a method for the micro-particulation of filtration residues comprising a mechanical treatment and a heat treatment, in particular of whey proteins in ultra-filtration whey concentrates, which in each case permit a particularly high yield of particles in a preselectable size range in a manner which spares resources, it is suggested to provide a separate heat treatment device (5) as well as a separate mechanical treatment device (9) or for the heat treatment and the mechanical treatment to be carried out separately from one another with respect to space and time.