In a method for recycling heterogeneous mixtures of materials resulting from size-reduction processes the heterogeneous mixture of materials is comminuted to form a comminuted intermediate product from which in a subsequent step comminuted particles of a preset size are separated. The selected comminuted particles are subjected to an agglomeration treatment for producing agglomerate particle product of a preset degree of agglomeration having an upper limit with respect to agglomerate particle size. The apparatus for recycling heterogeneous mixtures of materials from size-reduction processes has a comminution device for comminuting a heterogeneous mixture of materials to form a comminuted intermediate product and an agglomeration device, connected downstream of the comminution device, for subjecting at least a portion of the intermediate product to the agglomeration treatment for producing agglomerate particle product of a preset degree of agglomeration having an upper limit with respect to agglomerate particle size.