Abstract: A homogenizing apparatus has a number of grinding units made up of rotatable grinding members mounted in sequence on a drive shaft and corresponding fixed grinding members connected in sequence and supported only by the support frame which rotatably supports the drive shaft. The grinding surface of each rotatable grinding member opposes the grinding surface of a corresponding fixed grinding member, thereby forming a number of grinding zones. The raw material to be ground passes through all of the grinding zones in sequence. Complex pairs of grinding members can be added or removed to achieve the desired degree of grinding.